CN1825162A - Scanning optical system, optical scanner, and image forming apparatus - Google Patents
Scanning optical system, optical scanner, and image forming apparatus Download PDFInfo
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- CN1825162A CN1825162A CN 200610004123 CN200610004123A CN1825162A CN 1825162 A CN1825162 A CN 1825162A CN 200610004123 CN200610004123 CN 200610004123 CN 200610004123 A CN200610004123 A CN 200610004123A CN 1825162 A CN1825162 A CN 1825162A
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Abstract
A scanning optical system includes converges, with a single lens, a divergent luminous flux, which is deflected in a main scanning direction by an optical deflector, on a surface of a scan target. The lens has two surfaces in a biconvex shape in both the main scanning direction and a sub-scanning direction, and at least one of the surfaces is a toric surface in which a line that connects, on a cross section in the main scanning direction, centers of curvature in a cross section in the sub-scanning direction is nonlinear, and change of the curvature of the toric surface in the cross section in the sub-scanning direction along the main scanning direction is asymmetric with an optical axis of the lens. The surfaces are anamorphic surfaces.
Description
Technical field
The present invention relates to scanning optics, optical scanner, imaging device and coloured image and form device.
Background technology
In optical scanner widespread use digital copier, the laser printer etc.Scanning optics is that the luminous flux by light deflector deflection is converged to the optical system of luminous point on the scanning target surface, and is used for optical scanner.Scanning optics need have high optical property, is included on the whole sweep limit that scans target surface light flux concentration is become luminous point, is used for by scan the suitable correction of the high precision uniform velocity function and the various aberrations of whole scanning target surface according to uniform velocity with the luminous flux of fixed angles speed deflection.Traditionally, the scanning optics of scanner is made of lens combination usually.The quantity of lens one to two or more between change.Consider cost efficiency, the scanning optics that is made of lens is favourable.Yet, and to compare by the scanning optics that constitutes more than lens, the quantity of the design parameter of the scanning optics that is made of lens is few.In addition, if scanning optics is made of lens of unzoned lens surface configuration, then be difficult to guarantee suitable aberration correction.
A kind of like this technology has been proposed, even it is used under the situation that scanning optics is made of single lens, guarantee suitably to revise aberration and uniform velocity characteristic (Japanese Patent Application Publication (JP-A) No.H10-253915 and 2002-90677) by adopting special lenses surface configuration (special lens surface shape).The feature of disclosed technology is as follows in JP-A No.H10-253915.If when the main beam of the luminous flux of deflection is orthogonal to the scanning target surface, the direction of this main beam is assumed to reference direction X, is different from towards the main beam of the luminous flux of the deflection of the other end B that effectively writes the zone angle q2 with respect to the angle q1 of reference direction X with respect to reference direction X towards the main beam of the luminous flux of the deflection of an end A who effectively writes the zone.In addition, at least one scanning imagery element is from reference direction X skew or inclination, to alleviate the influence of sag (sag).Disclosed technology is characterised in that among the JP-A No.2002-90677, and the distance of the paraxial radius-of-curvature in the main sweep plane of the single lens of setting formation scanning imagery element, aspheric surface amount, distance scanning target surface etc. are to satisfy predetermined condition.
Recently, existence is for the tight demand of the scanning intensity that improves optical scanner.In order to satisfy this requirement, just need to reduce spot diameter and stable luminous point.Yet for this reason, the Modified geometrical optical aberration is not enough, is very important and necessary and revise glistening light of waves aberration (wave optical aberration).Disclosed technology does not relate to the correction for this type of wave optics aberration among JP-A No.H10-253915 and the 2002-90677.
Equally, need to reduce the scale of optical scanner.The scale that reduces optical scanner comprises size that reduces scanner and the thickness that reduces lens.Yet, keep its performance simultaneously if reduce the scale of optical scanner, on optical scanner, produce tolerance and dwindle and increase magnification.Thereby, need to realize and can guarantee high performance scanning optics with simple as far as possible shape.
Summary of the invention
The objective of the invention is to solve at least the problem in the conventional art.
Utilize single lens to converge on the scanning target surface according to the scanning optics of one aspect of the invention by the divergence light flux of optical deflector at the main scanning direction upper deflecting.This scanning optics comprises lens, and this lens configuration becomes to have two surfaces that are the biconvex shape on main scanning direction and sub scanning direction.At least one described surface is a double-curved surface, wherein the line of the center of curvature in the cross section on the auxiliary connection direction of scanning is non-linear in the cross section on main scanning direction, and the curved transition in the cross section of this double-curved surface on sub scanning direction is asymmetric about the optical axis of these lens.
Scanning optics according to a further aspect of the invention utilizes single lens to be converged on the scanning target surface by the divergence light flux of optical deflector at the main scanning direction upper deflecting.This scanning optics comprises lens, and this lens configuration becomes to have two surfaces that are the biconvex shape on main scanning direction and sub scanning direction.Described surface is textured surface (anamorphic surfaces).
Utilize single lens to converge on the scanning target surface according to the scanning optics of another aspect of the invention by the divergence light flux of optical deflector at the main scanning direction upper deflecting.This scanning optics comprises lens, and this lens configuration becomes to have two surfaces that are the biconvex shape on main scanning direction and sub scanning direction.In the described surface more a surface near optical deflector be the iso-curvature surface, wherein the curvature in the cross section on sub scanning direction is constant along main scanning direction.
Utilize single lens to converge on the scanning target surface according to the scanning optics of another aspect of the invention by the divergence light flux of optical deflector at the main scanning direction upper deflecting.This scanning optics satisfies | R1|＞| R2| and | r1|＞| r2|, wherein the radius-of-curvature of the first surface of lens on main scanning direction is R1, the radius-of-curvature of the second surface of lens on main scanning direction is R2, the radius-of-curvature of described first surface on sub scanning direction is r1, the radius-of-curvature of described second surface on sub scanning direction is r2, and in the described surface more a surface near optical deflector be the iso-curvature surface, wherein the curvature in the cross section on sub scanning direction is constant along main scanning direction.
Utilize single lens to converge on the scanning target surface according to the scanning optics of another aspect of the invention by the divergence light flux of optical deflector at the main scanning direction upper deflecting.This scanning optics satisfies 4.5＜L/d0＜7.5, and wherein the distance of the incidence surface from the reflection spot on the reflecting surface of optical deflector to lens is d0, is L from exit surface to the distance that scans target surface of lens; This scanning optics satisfies | R1|＞| R2| and | r1|＞| r2|, wherein the radius-of-curvature of the first surface of lens on main scanning direction is R1, the radius-of-curvature of the second surface of lens on main scanning direction is R2, the radius-of-curvature of described first surface on sub scanning direction is r1, and the radius-of-curvature of described second surface on sub scanning direction is r2; And the described surface of at least one of lens is a textured surface.
Single beam optical scanner according to another aspect of the invention comprises: light source, and it is configured to send luminous flux; Coupled lens, it is configured to make this luminous flux and subsequent optical system coupled; Optical deflector, it is configured to the Constant Angular Velocity deflected luminous flux; The line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux that is coupled is imaged as line image, and this line image is long along main scanning direction; And according to the scanning optics of above aspect.
Multi-beam optical scanning device according to another aspect of the invention comprises: a plurality of light sources, and it is configured to send luminous flux; Coupled lens, it is configured to make described luminous flux and subsequent optical system coupled; Optical deflector, it is configured to substantial constant angular velocity while deflected luminous flux; The concentric line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux of coupling is imaged as a plurality of line images, described a plurality of line images along main scanning direction long and on sub scanning direction separately; And according to the scanning optics of above aspect.
Imaging device according to another aspect of the invention comprises: the bearing member, image carrier; Optical scanner, it is configured to this bearing member, image carrier of optical scanning to form sub-image; And developing cell, its described sub-image that is configured to develop.This optical scanner is the optical scanner according to above aspect.
Coloured image formation device according to another aspect of the invention comprises: a plurality of bearing member, image carriers; Optical scanner, it is configured to optical scanning bearing member, image carrier, thereby forms at least one sub-image corresponding to each color; And developing cell, its described sub-image that is configured to develop.This optical scanner is the optical scanner according to above aspect.
When read in conjunction with the accompanying drawings, other purposes of the present invention, feature and advantage have obtained specifically describing or will becoming clear in detailed description subsequently.
Description of drawings
Fig. 1 is the skeleton view according to the single beam optical scanner of the embodiment of the invention;
Fig. 2 is the skeleton view of multi-beam optical scanning device according to another embodiment of the present invention;
Fig. 3 is the synoptic diagram according to the optical texture of the optical scanner of first embodiment of the invention;
Fig. 4 is (field curvature and uniform velocity characteristic) aberration figure in the optical scanner according to first embodiment;
Fig. 5 is according to magnification change in the optical scanner of first embodiment | the line chart of β h/ β 2|;
Fig. 6 A and 6B are the line charts that is used for illustrating according to the curvature on the subscan cross section of the scanning optics lens of first embodiment;
Fig. 7 A and 7B are for the depth curve according to the spot diameter of each picture altitude in the optical scanner of first embodiment;
Fig. 8 is the synoptic diagram according to the optical texture of the optical scanner of second embodiment of the invention;
Fig. 9 is (field curvature and uniform velocity characteristic) aberration figure in the optical scanner according to second embodiment;
Figure 10 is according to magnification change in the optical scanner of second embodiment | the line chart of β h/ β 2|;
Figure 11 A and 11B are the line charts that is used for illustrating according to the curvature on the subscan cross section of the scanning optics lens of second embodiment;
Figure 12 A and 12B are for the depth curve according to the spot diameter of each picture altitude in the optical scanner of second embodiment;
Figure 13 is the synoptic diagram according to the optical texture of the optical scanner of third embodiment of the invention;
Figure 14 is (field curvature and uniform velocity characteristic) aberration figure in the optical scanner according to the 3rd embodiment;
Figure 15 is according to magnification change in the optical scanner of the 3rd embodiment | the line chart of β h/ β 2|;
Figure 16 A and 16B are the line charts that is used for illustrating according to the curvature on the subscan cross section of the scanning optics lens of the 3rd embodiment;
Figure 17 A and 17B are for the depth curve according to the spot diameter of each picture altitude in the optical scanner of the 3rd embodiment;
Figure 18 is the front elevation according to the imaging device of the embodiment of the invention.
Embodiment
Below, with reference to accompanying drawing exemplary embodiment according to the present invention is elaborated.
Fig. 1 only illustrates the associated components according to the optical scanner of the embodiment of the invention.This optical scanner is the single beam optical scanner.Be converted into by coupled lens 2 from the divergence light flux of light source 1 emission and have the more luminous flux of low emission, this light source 1 is a semiconductor laser.
When the opening that makes luminous flux by coupled lens 2 transmission by hole 3, luminous flux peripheral cut enters the light beam of cylindrical lens 4 with formation, and it is the line imaging optical system.The idle direction of cylindrical lens 4 (powerless direction) is towards main scanning direction and only assemble the incident flux with positive light coke (positive power) on sub scanning direction, and this luminous flux is converged to along the long line image of main scanning direction at the deflecting reflection near surface of polygonal mirror 5, this polygonal mirror 5 is optical deflectors.
With the rotation of polygonal mirror 5, be deflected with fixed angles speed by polygonal mirror 5 light flux reflected, with transmission scioptics 6 with uniform velocity.The optical routing folding mirror 7 of luminous flux folds and be converged to luminous point on the photo-sensitive cell 8 as the scanning target surface, thereby optical scanning should the scanning target surface.
Before these photo-sensitive cell 8 surfaces of optical scanning, the luminous flux of deflection converges on the light receiving element 11 by minute surface 9 reflections and by imaging len 10.In response to reception to luminous flux, light receiving element 11 output signals.According to the signal output that comes from light receiving element 11, determine the beginning write time of optical scanning.
This scanning optics is will be become the optical system of luminous point by the light flux concentration of optical deflector 5 deflections on such as the scanning target surface of photo-sensitive cell 8.In the embodiment shown in fig. 1, scanning optics is made of single lens 6.Lens 6 are biconvex on main scanning direction and sub scanning direction.In this embodiment, lens 6 are anamorphotic optical systems, and it is used to make the zone of deflecting reflection near surface of polygonal mirror 5 and the surface of photo-sensitive cell 8 to have the geometrical optics conjugate relation on sub scanning direction.
Employing meets the following conditions the lens of (1) or scanning optics as lens or scanning optics 6.At this, suppose from being d0 as the reflection spot on the deflecting reflection surface of the polygonal mirror 5 of optical deflector to the distance of the incidence surface of lens 6.Simultaneously, suppose that from exit surface to the distance as photo-sensitive cell 8 surfaces of scanning target surface of lens 6 be L.
4.5＜L/d0＜7.5 (1)
In this embodiment, a surface of lens 6 is iso-curvature surfaces, and another surface is special toric lens surface.On special toric lens surface, be asymmetric about optical axis along the curved transition of main scanning direction on the subscan cross section.In addition, the scanning optics that adopts meet the following conditions (2) and (3) is as scanning optics 6.At this, the radius-of-curvature of first surface on main scanning direction of supposing scanning optics 6 is R1, the radius-of-curvature of its second surface on main scanning direction is R2, and the radius-of-curvature of first surface on sub scanning direction is r1, and the radius-of-curvature of second surface on sub scanning direction is r2.
|R1|＞|R2| (2)
|r1|＞|r2| (3)
Single beam optical scanner configuration shown in Figure 1 is as follows.Luminous flux from light source 1 is system coupled by coupled lens 2 and subsequent optical.The coupling luminous flux be imaged as line image by cylindrical lens or line imaging optical system 4 at the deflecting reflection near surface of polygonal mirror or optical deflector 5, and by optical deflector 5 with the deflection of fixed angles speed, line image wherein is long along main scanning direction.In addition, the luminous flux of deflection is converged to luminous point by lens or scanning optics 6 on photo-sensitive cell 8 surfaces or scanning target surface, thereby optical scanning should scanning target surface 8.Employing according to each described scanning optics in the claim 1 to 41 as this scanning optics 6.
Fig. 2 illustrates optical scanner according to another embodiment of the present invention.Optical scanner shown in Figure 2 is the multi-beam optical scanning device.For for simplicity, in Fig. 2, be used for the identical composed component of expression with Fig. 1 with same reference numerals among Fig. 1.Among Fig. 2, light source 1 constitutes the wherein equidistant alignment of light emitting source ch1 to ch4 by semiconductor laser array.In this embodiment, four light emitting source ch1 to ch4 are arranged on the sub scanning direction.Certainly, the light emitting source ch1 to ch4 of semiconductor laser array can be in tilted layout with respect to sub scanning direction.Four luminous fluxes that send from four corresponding light emitting source ch1 to ch4 are divergence light flux, and it has the major axis towards the oval far field pattern of main scanning direction.Four luminous fluxes are system coupled by coupled lens 2 and subsequent optical.According to the optical characteristics of subsequent optical system, the luminous flux of coupling can be converted to luminous flux with low emission more, have lower convergent luminous flux or parallel luminous flux.
Four luminous fluxes by coupled lens 2 transmission carry out beam shaping by hole 3, and by assembling on sub scanning direction as the effect of the cylindrical lens 4 of concentric line imaging optical system.In addition, four luminous fluxes are imaged as line image at the deflecting reflection near surface as the polygonal mirror 5 of optical deflector, are separated from each other on sub scanning direction simultaneously, and wherein line image is long along main scanning direction.Owing to drive polygonal mirror 5 rotations, thereby four luminous fluxes deflecting reflection surface by polygonal mirror 5 is deflected with fixed angles speed.Four of deflection luminous fluxes are by single lens 6 transmission as scanning optics thus.Under the folding situation of the optical routing folding mirror 7 of four luminous fluxes, four luminous fluxes are converged to four luminous points that are separated from each other on sub scanning direction on photo-sensitive cell 8 surfaces, and wherein photo-sensitive cell 8 is the scanning target surface basically.Thereby four sweep traces on the scanning target surface are by the while optical scanning.
Before these photo-sensitive cell 8 surfaces of optical scanning, one of luminous flux of deflection is transmitted, is converged on the light-emitting component 11 by minute surface 9 reflections and by lens 10 by lens 6.In response to the reception of luminous flux, light receiving element 11 output detection signals.According to the output of this signal, determine the beginning write time of optical scanning.
This scanning optics is will be become the optical system of four luminous points by four light flux concentration of polygonal mirror or optical deflector 5 deflections simultaneously respectively on as photo-sensitive cell 8 surfaces of scanning target surface.Scanning optics is made of lens 6.These lens 6 are identical with lens with reference to Fig. 1 explanation, and the lens that adopt meet the following conditions (1) are as these lens 6.At this, suppose from being d0 as the reflection spot on the deflecting reflection surface of optical deflector 5 to the distance of the incidence surface of lens 6.Simultaneously, suppose that from exit surface to the distance as photo-sensitive cell 8 surfaces of scanning target surface of lens 6 be L.
4.5＜L/d0＜7.5 (1)
Be similar to embodiment shown in Figure 1, a surface of lens or scanning optics 6 is iso-curvature surfaces, and its another surface is special toric lens surface.On special toric lens surface, be asymmetric about optical axis along the curved transition of main scanning direction on the subscan cross section.In addition, the scanning optics that adopts meet the following conditions (2) and (3) is as scanning optics 6.At this, the radius-of-curvature of first surface on main scanning direction of supposing scanning optics 6 is R1, the radius-of-curvature of its second surface on main scanning direction is R2, and the radius-of-curvature of first surface on sub scanning direction is r1, and the radius-of-curvature of second surface on sub scanning direction is r2.
|R1|＞|R2| (2)
|r1|＞|r2| (3)
Multi-beam optical scanning device configuration shown in Figure 2 is as follows.Come the luminous flux of self-emitting light source ch1 to ch4 system coupled with subsequent optical by public coupled lens 2.The luminous flux of coupling is imaged as line image by cylindrical lens or concentric line imaging optical system 4 at the deflecting reflection near surface of polygonal mirror or optical deflector 5, and this line image is long and be separated from each other on sub scanning direction along main scanning direction.Described luminous flux by optical deflector 5 with the deflection simultaneously of fixed angles speed.The luminous flux of deflection is converged to a plurality of luminous points that are separated from each other by common scanning optical system 6 on sub scanning direction on photo-sensitive cell 8 surfaces or scanning target surface, thereby be somebody's turn to do the multi-strip scanning line that scans on the target surface 8 by these luminous point optical scannings.Employing is configured to lens 6 according to used lens in the described scanning optics of claim 42 as this common scanning optical system.Adopt and wherein arrange the integral semiconductor laser array of light emitting source ch1 to ch4 as light source 1.
In this manual, " spot diameter of luminous point " is by intensity 1/e in the line spread function (line spread function) of the light intensity distributions of luminous point on the scanning target surface
2Determine.Line spread function comprises the line spread function LSZ of Z direction and the line spread function LSY of Y direction.When representing that by coordinate Y and Z (Y, in the time of Z), LSZ and LSY are defined as follows for the light intensity distributions f of luminous point according to the coordinate that is formed at the optical spot centre of scanning on the target surface on the main scanning direction and on the sub scanning direction respectively.
LSZ (Z)=∫ f (Y, Z) dY (the whole width of luminous point on the Y direction carried out integration)
LSY (Y)=∫ f (Y, Z) dZ (the whole width of luminous point on the Z direction carried out integration)
Usually, these line spread functions LSZ (Z) and LSY (Y) are generally gauss of distribution function.Spot diameter on Y and the Z direction is by wherein each LSZ (Z) and LSY (Y) are equal to or greater than maximum 1/e respectively
2The Y and the Z direction width in zone determine.
The spot diameter of determining by line spread function can be easy to by with uniform velocity along this luminous point of slit optical scanning, receive by the light of this slits transmit and the light that is received carried out integration measure by fluorescence detector.Can obtain the device of measuring light spot diameter on the market.
Three concrete examples below are described.In first, second and the 3rd embodiment, Fig. 3,8 and 13 illustrates the optical texture of optical scanner respectively.
The shapes of the lens surface shown in each example etc. are defined by following equation statement.
" the non-circular shape in the main sweep cross section "
The shape of lens surface is represented by following known polynomial expression (5).In equation (5), R represents the paraxial radius-of-curvature in the main sweep cross section, and Y represents on the main scanning direction that apart from the distance of optical axis, K represents the constant of the cone.In addition, A
1, A
2, A
3, A
4, A
5, A
6Expression high-order coefficient, X represents the degree of depth on the optical axis direction.
In equation (5), if one or more odd order coefficient A
1, A
3, A
5... for non-0, then the shape of lens surface is asymmetric on main scanning direction.
" curvature in the subscan cross section "
When the curvature in the subscan cross section (inverse of radius-of-curvature) (was represented by the coordinate Y that optical axis position is set at initial point) to change on main scanning direction, the curvature C in the subscan cross section (Y) was by following equation (6) expression.In equation (6), r (0) is illustrated in the radius-of-curvature on the optical axis in the subscan cross section, B
1, B
2Expression high-order coefficient.
C(Y)＝{1/r(0)}+B
1Y+B
2Y
2+B
3Y
3+B
4Y
4+B
5Y
5+B
6Y
6+… (6)
In equation (6), if one or more odd order coefficient B of Y
1, B
3, B
5... for non-0, then to change be asymmetric on main scanning direction to the radius-of-curvature in the subscan cross section.If all coefficient B of Y
1, B
2, B
3... be 0, then lens surface is the iso-curvature surface.
The analytical expression on special toric lens surface is not limited to above-mentioned expression formula, and can adopt various expression formulas.Expression formula according to the shape of lens surface of the present invention is not limited to above-mentioned expression formula.
Below, with reference to the example of concrete numbers illustrated according to scanning optics of the present invention.
" light source "
Wavelength: 780 nanometers
" coupled lens "
Focal length: 15 millimeters
Coupling (coupling action): disperse function
The nature convergent point, promptly to the reverse converged position of reviewing of the divergence light flux that sends from coupled lens: towards the scanning target surface apart from light source-259.76 millimeter.
" cylindrical lens "
Focal length on the sub scanning direction: 26.49 millimeters
" polygonal mirror "
The quantity on deflecting reflection surface: 6
Inradius: 16 millimeters
From the angle between the optical axis of the incident angle of the luminous flux of light source and scanning optics: 64 °
" about being arranged in the data of the optical system between polygonal mirror and the scanning target surface "
The radius-of-curvature of optical system on main scanning direction is expressed as " R ", and the radius-of-curvature of optical system on sub scanning direction is expressed as " r ", and the refractive index of optical system is expressed as " n ".In the data shown in the following table 1, " R ", " r " represent paraxial radius-of-curvature.
Table 1
| Surface sequence number: i | R | r | X | Y | n | |
| The reflecting surface of | 0 | 8 | 28 | 0.38 | ||
| The incidence surface of | 1 | 177.446 | 101.000 | 13.5 | 0 | 1.523961 |
| The exit surface of lens | 2 | -90.211 | -17.636 | 158.5 | 0 |
In last table 1, symbol X and Y are illustrated respectively in the distance between the summit of each surperficial sequence number i to i+1 on optical axis direction and the main scanning direction.For example, the X=28 and the Y=0.38 of surperficial sequence number 0 (deflecting reflection surface) are expressed as follows meaning.Position (picture altitude on it is 0 reflection position) with deflecting reflection point is gone up at a distance of 28 millimeters at optical axis direction (directions X) in the summit of the incidence surface of lens 6 (surperficial sequence number 1), and on main scanning direction (Y direction) apart 0.38 millimeter.The X=13.5 of surface sequence number 1 represents the thickness of lens 6 on optical axis.The X=28 of surface sequence number 0 (deflecting reflection surface) is corresponding to according to claim 4,10,16,27 and 33 d0.The X=158.5 of surface sequence number 2 (exit surfaces of lens 6) is corresponding to according to claim 4,10,16,27 and 33 L.Thereby, scanning optics satisfy condition (1).
4.5＜L/d0＝5.66＜7.5
Incidence surface (surperficial sequence number: i=1) be the iso-curvature surface, and the shape in the main sweep cross section is the non-circular shape by equation (6) expression.Table 2 illustrates the main scanning direction and the sub scanning direction coefficient of this incidence surface.
Table 2
| The incidence surface of lens (surperficial sequence number 1) | |||
| The main scanning direction coefficient | The sub scanning direction coefficient | ||
| K | -8.031×10 | ||
| | 0 | | |
| A2 | |||
| 0 | | ||
| A3 | |||
| 0 | B3 | ||
| A4 | -1.478×10 -06 | | |
| A5 | |||
| 0 | B5 | ||
| A 6 | 2.229×10 -10 | | |
| A7 | |||
| 0 | B7 | ||
| A 8 | 5.515×10 -13 | B 8 | |
| A 9 | 0 | B 9 | |
| A 10 | -7.251×10 -17 | B 10 | |
| A 11 | 0 | B 11 | |
| A 12 | -1.087×10 -19 | B 12 | |
| A 13 | 0 | B 13 | |
| A 14 | 6.166×10 -23 | B 14 | |
Exit surface (surperficial sequence number: i=2) be the special lenses surface, and its shape in the main sweep cross section is non-circular arc symmetry about optical axis.Table 3 illustrates the main scanning direction and the sub scanning direction coefficient of this exit surface.
Table 3
| The exit surface of lens (surperficial sequence number 2) | |||
| The main scanning direction coefficient | The sub scanning direction coefficient | ||
| K | 1.22 | ||
| A 1 | 0 | B 1 | -3.903×10 -05 |
| A 2 | 0 | B 2 | 1.347×10 -05 |
| A 3 | 0 | B 3 | -1.570×10 -08 |
| A 4 | -8.971×10 -07 | B4 | -1.182×10 -08 |
| |
0 | B5 | 9.552×10 -12 |
| A6 | -2.513×10 -10 | B6 | 6.557×10 -12 |
| A 7 | 0 | B 7 | |
| A 8 | 1.706×10 -13 | | |
| A9 | |||
| 0 | B9 | ||
| A10 | -3.419×10 -17 | B10 | |
| A 11 | 0 | B 11 | |
| A 12 | 8.062×10 -20 | | |
| A13 | |||
| 0 | B13 | ||
| A14 | 4.869×10 -23 | B14 |
In first embodiment, the lateral magnification β of the center image height of scanning optics on sub scanning direction
2Be 4.79.Fig. 4 illustrates field curvature (left figure: solid line vice scanning field curvature, dotted line is represented the main sweep field curvature) and uniform velocity characteristic (right figure: solid line is represented the linearity, and dotted line is represented f θ characteristic).
Main scanning direction: 1.327mm/216mm
Sub scanning direction: 1.676mm/216mm
The linearity: 0.493%/216mm
By Fig. 4 obviously as can be known, field curvature and uniform velocity characteristic have significantly suitably been revised.
Fig. 5 shows the sub scanning direction lateral magnification β of arbitrary image height
hSub scanning direction lateral magnification β with respect to the center image height
2Variation.Significantly suitably revised magnification change | β
h/ β
2|.
Fig. 6 A and 6B illustrate the curved transition of the incidence surface and the exit surface of lens 6 respectively.In this example, incidence surface is " iso-curvature surface ".
Fig. 7 A and 7B illustrate for the spot diameter depth curve of each picture altitude of luminous point among first embodiment (variation that spot diameter defocuses with respect to luminous point).Fig. 7 A is relevant with main scanning direction, and Fig. 7 B is relevant with sub scanning direction.In first embodiment, by the intensity 1/e of line spread function
2The spot diameter of definition is about 50 microns.Shown in Fig. 7 A and 7B, spot diameter has enough degree of depth on main scanning direction and sub scanning direction, thereby for scanning the high tolerance of positional precision assurance of target surface.
In first embodiment, the lens 6 that constitute scanning optics are made of plastic material.Perhaps, can use the material of glass material as lens 6.In addition, in order further to reduce the beam spots diameter, the surface configuration of lens 6 can be non-circular arc on sub scanning direction.
In addition, by the off-centre of scanning optics, can more suitably carry out the aberration correction.In first embodiment, realize superperformance for 0.33 ° with respect to the normal slope of scanning target surface by making lens 6.
Fig. 8 illustrates the optical scanner according to second embodiment, and it comprises scanning optics of the present invention.Among Fig. 8, optical element is represented by the Reference numeral identical with first embodiment.
" light source "
Wavelength: 780 nanometers
" coupled lens "
Focal length: 15 millimeters
Coupling: disperse function
The nature convergent point: towards the scanning target surface apart from light source-1259.179 millimeter.
" cylindrical lens "
Focal length on the sub scanning direction: 26.49 millimeters
" polygonal mirror "
The quantity on deflecting reflection surface: 6
Inradius: 13 millimeters
From the angle between the optical axis of the incident angle of the luminous flux of light source and scanning optics: 64 °
" about being arranged in the data of the optical system between polygonal mirror and the scanning target surface ": referring to table 4.
Table 4
| Surface sequence number: i | R | r | X | Y | n | |
| The reflecting surface of | 0 | 8 | 8 | 31.5 | 0.24 | |
| The incidence surface of | 1 | 313.457 | 81.026 | 13.5 | 0 | 1.523961 |
| The exit surface of lens | 2 | -121.007 | -20.491 | 189 | 0 |
The X=189 of surface sequence number 2 (exit surfaces of lens 6) is corresponding to according to claim 4,10,16,27 and 33 L.Thereby, scanning optics satisfy condition (1).
4.5＜L/d0＝5.66＜7.5
Incidence surface (surperficial sequence number: i=1) be the iso-curvature surface, and the shape in the main sweep cross section is the non-circular shape by equation (6) expression.Table 5 illustrates the main scanning direction and the sub scanning direction coefficient of this incidence surface.
Table 5
| The incidence surface of lens | |||
| The main scanning direction coefficient | The sub scanning direction coefficient | ||
| K | -2.561×10 2 | ||
| A 1 | 0 | B 1 | |
| A 2 | 0 | B 2 | |
| A 3 | 0 | B 3 | |
| A 4 | -3.102×10 -6 | B 4 | |
| A 5 | 0 | B 5 | |
| A 6 | -9.584×10 -10 | B 6 | |
| A 7 | 0 | B 7 | |
| A 8 | 1.050×10 -12 | B 8 | |
| A 9 | 0 | B 9 | |
| A 10 | -5.491×10 -16 | B 10 | |
| A 11 | 0 | B 11 | |
| A 12 | -2.566×10 -19 | B 12 | |
| A 13 | 0 | B 13 | |
| A 14 | 7.360×10 -22 | B 14 | |
Exit surface (surperficial sequence number: i=2) be the special lenses surface, and its shape in the main sweep cross section is non-circular arc symmetry about optical axis.
Table 6 illustrates the main scanning direction and the sub scanning direction coefficient of this exit surface.
Table 6
| The exit surface of lens | |||
| The main scanning direction coefficient | The sub scanning direction coefficient | ||
| K | -5.064 | ||
| A 1 | 0 | B 1 | -2.233×10 -5 |
| A 2 | 0 | B 2 | 1.361×10 -5 |
| A 3 | 0 | B 3 | -5.889×10 -9 |
| A 4 | -2.486×10 -06 | B 4 | -1.225×10 -8 |
| A 5 | 0 | B 5 | -2.491×10 -12 |
| A 6 | -8.750×10 -10 | B 6 | -1.650×10 -12 |
| A 7 | 0 | B 7 | |
| A 8 | 2.321×10 -13 | B 8 | |
| A 9 | 0 | B 9 | |
| A 10 | -3.810×10 -16 | B 10 | |
| A 11 | 0 | B 11 | |
| A 12 | -2.591×10 -21 | B 12 | |
| A 13 | 0 | B 13 | |
| A 14 | 1.155×10 -22 | B 14 |
In a second embodiment, the lateral magnification β of the center image height of scanning optics on sub scanning direction
2Be 4.8.
Fig. 9 illustrates field curvature (left figure: solid line vice scanning field curvature, dotted line is represented the main sweep field curvature) and uniform velocity characteristic (right figure: solid line is represented the linearity, and dotted line is represented f θ characteristic).
Main scanning direction: 1.634mm/216mm
Sub scanning direction: 0.306mm/216mm
The linearity: 2.506%/216mm
By Fig. 9 obviously as can be known, field curvature and uniform velocity characteristic have significantly suitably been revised.
In addition, for effectively writing width W=216 millimeter, subscan field curvature Fs is 0.305 millimeter.Scanning optics meet the following conditions (4):
Fs/W＝0.0014＜0.005。
Figure 10 shows the sub scanning direction lateral magnification β of arbitrary image height
hVariation with respect to the sub scanning direction lateral magnification β 2 of center image height.Significantly suitably revised magnification change | β
h/ β
2|.
Figure 11 A and 11B illustrate the curved transition of the incidence surface and the exit surface of lens 6 respectively.In this example, incidence surface is " iso-curvature surface ".
Figure 12 A and 12B illustrate for the spot diameter depth curve of each picture altitude of luminous point among second embodiment (variation that spot diameter defocuses with respect to luminous point).Spot diameter has enough degree of depth on main scanning direction and sub scanning direction, thereby for scanning the high tolerance of positional precision assurance of target surface.
In a second embodiment, the lens 6 that constitute scanning optics are made of plastic material.Perhaps, can use the material of glass material as lens 6.In addition, in order further to reduce the beam spots diameter, the surface configuration of lens 6 can be non-circular arc on sub scanning direction.In addition, by the off-centre of scanning optics, can more suitably carry out the aberration correction.
Figure 13 illustrates the optical scanner according to second embodiment, and it comprises scanning optics of the present invention.Among Figure 13, optical element is represented by the Reference numeral identical with first and second embodiment.
" light source "
Wavelength: 780 nanometers
" coupled lens "
Focal length: 15 millimeters
Coupling: disperse function
The nature convergent point: towards the scanning target surface apart from light source-1259.179 millimeter.
" cylindrical lens "
Focal length on the sub scanning direction: 26.49 millimeters
" polygonal mirror "
The quantity on deflecting reflection surface: 6
Inradius: 13 millimeters
From the angle between the optical axis of the incident angle of the luminous flux of light source and scanning optics: 64 °
" about being arranged in the data of the optical system between polygonal mirror and the scanning target surface ": referring to table 7.
Table 7
| Surface sequence number: i | R | r | X | n | |
| The reflecting surface of | 0 | 8 | 8 | 31.5 | |
| The incidence surface of | 1 | 185.818 | 104.037 | 13.5 | 1.523961 |
| The exit surface of lens | 2 | -127.160 | -18.791 | 160 |
The X=160 of surface sequence number 2 (exit surfaces of lens 6) is corresponding to according to claim 4,10,16,27 and 33 L.Thereby, scanning optics satisfy condition (1).
4.5＜L/d0＝5.66＜7.5
Incidence surface (surperficial sequence number: i=1) be the iso-curvature surface, and the shape in the main sweep cross section is the non-circular shape by equation (6) expression.Table 8 illustrates the main scanning direction and the sub scanning direction coefficient of this incidence surface.
Table 8
| The incidence surface of lens | |||
| The main scanning direction coefficient | The sub scanning direction coefficient | ||
| K | -5.753×10 | ||
| A 1 | 0 | B 1 | |
| A 2 | 0 | B 2 | |
| A 3 | 0 | B 3 | |
| A 4 | -1.143×10 -6 | B 4 | |
| A 5 | 0 | B 5 | |
| A 6 | -2.816×10 -10 | B 6 | |
| A 7 | 0 | B 7 | |
| A8 | 2.058×10 -13 | B 8 | |
| A 9 | 0 | B 9 | |
| A 10 | -9.319×10 -17 | B 10 | |
| A 11 | 0 | B 11 | |
| A 12 | -2.947×10 -20 | B 12 | |
| A 13 | 0 | B 13 | |
| A 14 | 1.991×10 -23 | B 14 |
Exit surface (surperficial sequence number: i=2) be the special lenses surface, and its shape in the main sweep cross section is non-circular arc symmetry about optical axis.Table 9 illustrates the main scanning direction and the sub scanning direction coefficient of this exit surface.
Table 9
| The exit surface of lens | |||
| The main scanning direction coefficient | The sub scanning direction coefficient | ||
| K | -3.133×10 -1 | ||
| A 1 | 0 | B 1 | -1.481×10 -5 |
| A 2 | 0 | B 2 | 1.431×10 -5 |
| A 3 | 0 | B 3 | -1.323×10 -8 |
| A 4 | -8.235×10 -7 | B 4 | -6.382×10 -9 |
| A 5 | 0 | B 5 | 3.373×10 -12 |
| A 6 | -4.142×10 -10 | B 6 | -9.084×10 -13 |
| A 7 | 0 | B 7 | |
| A 8 | -3.725×10 -14 | B 8 | |
| A 9 | 0 | B 9 | |
| A 10 | -9.118×10 -18 | B 10 | |
| A 11 | 0 | B 11 | |
| A 12 | 3.553×10 -21 | B 12 | |
| A 13 | 0 | B 13 | |
| A 14 | -2.331×10 -23 | B 14 | |
In the 3rd embodiment, the lateral magnification β of the center image height of scanning optics on sub scanning direction
2Be 4.25.
Figure 14 illustrates field curvature (left figure: solid line vice scanning field curvature, dotted line is represented the main sweep field curvature) and uniform velocity characteristic (right figure: solid line is represented the linearity, and dotted line is represented f θ characteristic).
Main scanning direction: 2.153mm/216mm
Sub scanning direction: 0.505mm/216mm
The linearity: 1.144%/216mm
By Figure 14 obviously as can be known, field curvature and uniform velocity characteristic have significantly suitably been revised.
In addition, for effectively writing width W=216 millimeter, subscan field curvature Fs is 0.505 millimeter.Scanning optics meet the following conditions (4):
Fs/W＝0.0014＜0.005。
Figure 15 is illustrated in the sub scanning direction lateral magnification β of arbitrary image height among the 3rd embodiment
hSub scanning direction lateral magnification β with respect to the center image height
2Variation.Significantly suitably revised magnification change | β
h/ β
2|.
Figure 16 A and 16B illustrate the curved transition of the incidence surface and the exit surface of lens 6 respectively.In this example, incidence surface is " iso-curvature surface ".
Figure 17 A and 17B illustrate for the spot diameter depth curve of each picture altitude of luminous point among the 3rd embodiment (variation that spot diameter defocuses with respect to luminous point).Spot diameter has enough degree of depth on main scanning direction and sub scanning direction, thereby for scanning the high tolerance of positional precision assurance of target surface.
In the 3rd embodiment, the lens 6 that constitute scanning optics are made of plastic material.Perhaps, can use the material of glass material as lens 6.In addition, in order further to reduce the beam spots diameter, the surface configuration of lens 6 can be non-circular arc on sub scanning direction.
In addition, by making scanning optics off-centre, can more suitably carry out the aberration correction.In the 3rd embodiment, realize superperformance for 0.1 ° with respect to the normal slope of scanning target surface by making lens 6.
The following describes imaging device according to another embodiment of the present invention.Figure 18 illustrates the imaging device according to this embodiment.In this embodiment, imaging device is a laser printer.Among Figure 18, laser printer 1000 comprises the photo-sensitive cell that forms cylindrical shape, and it is as bearing member, image carrier 1110.Charging roller 1121, developing cell 1131, transfer roll 1141 and clearer 1151 as charging device are arranged around image-carrier 1110.Perhaps, can use corona charging device as charging device.The optical scanner 1171 that uses laser beam LB to carry out optical scanning is arranged on image-carrier 1110 and the charging roller 1121, and is written between charging roller 1121 and the developing cell 1131 by optics and exposes.Can adopt any optical scanner, as optical scanner 1171 according to the above-mentioned example that has illustrated.
Among Figure 18, Reference numeral 1161 expression fixing devices, 1181 expression paper feeding cassettes, 1191 expression registration rollers are right, 1201 expression paper feed rollers, 1211 expression transfer paper transfer paths, 1221 expression exit rollers are right, 1231 expression pallets, and P represents the transfer paper as sheet-shaped recording medium.In image forming course, turn clockwise with uniform velocity as the image-carrier 1110 of photo-sensitive cell.The surface of image-carrier 1110 is by charging roller 1121 uniform charging.Optical scanner 1171 utilizes laser beam LB at image-carrier 1110 surface optics writing informations, thereby exposes and form electrostatic latent image.The electrostatic latent image of Xing Chenging is so-called negative sub-image (negative latent image) thus, and its image section is exposed.
Electrostatic latent image is changed by developing cell 1131 and is developed, thereby forms toner image on image-carrier 1110.The box 1181 that wherein piles up transfer paper P removably is connected in the main unit of imaging device 1000.Under state shown in Figure 180, wherein box 1181 is connected in main unit, and uppermost transfer paper P is extracted out by paper feed roller 1201.Thus the end of the transfer paper P of Chou Chuing by registration rollers to 1191 clampings.Toner image on image-carrier 1110 is moved in the transfer position, and registration rollers is supplied to transfer roll 1141 as transfer printing unit to 1191 with transfer paper P.
Toner image is transferred on the transfer paper P by alignment and by the effect of transfer roll 1141 statically being supplied on the transfer paper P of transfer printing unit 1141.Transfer paper P is supplied to fixing device 1161, its with toner image on transfer paper P.Transfer paper P is discharged on the pallet 1231 1221 by transfer path 1211 and by exit roller.After toner image being transferred on the transfer paper P, clear up by the surface of 1151 pairs of image-carriers 1110 of cleaner, to remove residual toner, paper scrap etc.
By adopting in the optical scanner shown in Fig. 1,8 and 13 any, can form very gratifying image as optical scanner 1171.
In addition, so-called tandem coloured image formation device can be by following structure.Arrange a plurality of bearing member, image carriers, carry out optical scanning thereon, to form sub-image corresponding to respective color corresponding to the optical scanner of each image-carrier.These sub-images develop by developing cell, and alignment and being needed on the offset medium such as transfer paper respectively, thereby obtain coloured image.By adopting, can form very gratifying coloured image according to any each optical scanner in the optical scanner of above-mentioned example as this coloured image formation device.
As implied above, the present invention can realize that a kind of scanning optics of novelty, novel optical scanner, the imaging device of novelty and novel coloured image form device.
According to the foregoing description, can reduce the cost and the size of optical scanner, make simultaneously and not only can revise, and can learn aberration correction the glistening light of waves to the geometrical optics aberration.In addition, can reduce spot diameter, thereby carry out gratifying optical scanning.In addition, can form precise image.
In addition,, can alleviate the influence of optics sag (optical sag), and suppress the deterioration of the wave aberration of scanning optics the optical property of scanning optics on sub scanning direction according to the foregoing description.
In addition, according to the foregoing description, can suppress independently of one another on the main scanning direction and sub scanning direction on the glistening light of waves learn aberration.
In addition, according to the foregoing description, can obtain high performance scanning optics.
In addition, according to the foregoing description, can guarantee as much as possible the field curvature of the luminous point on the scanning target surface to be revised, and guarantee maximum uniform velocity characteristic.
In addition, according to the foregoing description, even in margin tolerance, also can guarantee high optical property under the erratic situation of precision.
In addition, according to the foregoing description, can reduce variation along with the picture altitude of the subscan field curvature of scanning optics, and suppress light-beam position (beam west position) on the sub scanning direction according to picture altitude with respect to the scanning target surface by marked change.
In addition, according to the foregoing description, the positive light coke of lens can be distributed in the respective lens surface.
In addition, according to the foregoing description, can use the high speed optical writing information.
In addition, according to the foregoing description, can realize resisting the optical scanning system of the face disparity error (face tangle error) of the optical deflector that is used for laser scanning.
Though described the present invention with respect to specific embodiment in order to carry out fully clearly open, but claims are not limited thereto, and it should be understood to contain all modifications and optional structure in the basic instruction that it may occur to persons skilled in the art that and fall within this explanation.
The cross reference of related application
Presents is by being filed in the full content that is filed in the Japanese priority file 2005-091795 of Japan in Japanese Japanese priority file 2005-044661, on March 28th, 2005 and was filed in the Japanese priority file 2005-138243 of Japan on May 11st, 2005 on February 21st, 2005 with reference to combining.
Claims (76)
1. scanning optics, it utilizes single lens to be converged on the scanning target surface by the divergence light flux of optical deflector at the main scanning direction upper deflecting, and this scanning optics comprises
Lens, it is configured to have two surfaces that are the biconvex shape on main scanning direction and sub scanning direction, wherein
At least one described surface is a double-curved surface, and wherein the line of the center of curvature in the cross section on the auxiliary connection direction of scanning is non-linear in the cross section on main scanning direction, and
Curved transition in the cross section of this double-curved surface on sub scanning direction is asymmetric about the optical axis of these lens.
2. scanning optics as claimed in claim 1, wherein said surface is a textured surface.
3. scanning optics as claimed in claim 2, wherein
At least one described surface is the iso-curvature surface, and wherein the curvature in the cross section on sub scanning direction is constant along main scanning direction.
4. scanning optics as claimed in claim 1, wherein scanning optics satisfies 4.5＜L/d0＜7.5, wherein the distance of the incidence surface from the reflection spot on the reflecting surface of optical deflector to lens is d0, is L from exit surface to the distance that scans target surface of lens.
5. scanning optics as claimed in claim 1, wherein scanning optics satisfies | R1|＞| R2| and | r1|＞| r2|, wherein the radius-of-curvature of the first surface of lens on main scanning direction is R1, the radius-of-curvature of the second surface of lens on main scanning direction is R2, the radius-of-curvature of described first surface on sub scanning direction is r1, and the radius-of-curvature of described second surface on sub scanning direction is r2.
6. scanning optics as claimed in claim 1, wherein scanning optics satisfies Fs/W＜0.005, and wherein effectively writing width is W, and the width that effectively writes the subscan field curvature in the width is Fs.
7. scanning optics as claimed in claim 1, wherein scanning optics is configured to have and utilizes luminous point function with this scanning target surface of substantial constant speed optical scanning on main scanning direction, and the function of revising the face disparity error of the optical deflector that is used for laser scanning on sub scanning direction.
8. scanning optics as claimed in claim 1, wherein the material of lens comprises resin.
9. scanning optics as claimed in claim 1, wherein optical axis is with respect to the normal slope of scanning target surface.
10. scanning optics as claimed in claim 1, wherein many light beams of deflection simultaneously are converged to a plurality of luminous points that separate on sub scanning direction on the scanning target surface.
11. a scanning optics, it utilizes single lens to be converged on the scanning target surface by the divergence light flux of optical deflector at the main scanning direction upper deflecting, and this scanning optics comprises
Lens, it is configured to have two surfaces that are the biconvex shape on main scanning direction and sub scanning direction, wherein
Described surface is a textured surface.
12. scanning optics as claimed in claim 11, wherein
Lens configuration becomes to have two surfaces that are the biconvex shape on main scanning direction and sub scanning direction, wherein
At least one described surface is a double-curved surface, and wherein the line of the center of curvature in the cross section on the auxiliary connection direction of scanning is non-linear in the cross section on main scanning direction, and
Curved transition in the cross section of this double-curved surface on sub scanning direction is asymmetric about the optical axis of these lens.
13. scanning optics as claimed in claim 12, wherein
At least one described surface is the iso-curvature surface, and wherein the curvature in the cross section on sub scanning direction is constant along main scanning direction.
14. scanning optics as claimed in claim 11, wherein scanning optics satisfies 4.5＜L/d0＜7.5, wherein the distance of the incidence surface from the reflection spot on the reflecting surface of optical deflector to lens is d0, is L from exit surface to the distance that scans target surface of lens.
15. scanning optics as claimed in claim 11, wherein scanning optics satisfies | R1|＞| R2| and | r1|＞| r2|, wherein the radius-of-curvature of the first surface of lens on main scanning direction is R1, the radius-of-curvature of the second surface of lens on main scanning direction is R2, the radius-of-curvature of described first surface on sub scanning direction is r1, and the radius-of-curvature of described second surface on sub scanning direction is r2.
16. scanning optics as claimed in claim 11, wherein scanning optics satisfies Fs/W＜0.005, and wherein effectively writing width is W, and the width that effectively writes the subscan field curvature in the width is Fs.
17. scanning optics as claimed in claim 11, wherein scanning optics be configured to have utilize luminous point on the main scanning direction with the function of this scanning target surface of substantial constant speed optical scanning with revise the function of the face disparity error of the optical deflector that is used for laser scanning on sub scanning direction.
18. scanning optics as claimed in claim 11, wherein the material of lens comprises resin.
19. scanning optics as claimed in claim 11, wherein the optical axis of lens is with respect to the normal slope of scanning target surface.
20. scanning optics as claimed in claim 11, wherein many light beams of deflection simultaneously are converged to a plurality of luminous points that separate on sub scanning direction on the scanning target surface.
21. a scanning optics, it utilizes single lens to be converged on the scanning target surface by the divergence light flux of optical deflector at the main scanning direction upper deflecting, and this scanning optics comprises
Lens, it is configured to have two surfaces that are the biconvex shape on main scanning direction and sub scanning direction, wherein
In the described surface more a surface near optical deflector be the iso-curvature surface, wherein the curvature in the cross section on sub scanning direction is constant along main scanning direction.
22. scanning optics as claimed in claim 21, wherein said surface is a textured surface.
23. scanning optics as claimed in claim 22, wherein
More approaching scanning target surface surface is a double-curved surface in the described surface, and wherein the line of the center of curvature in the cross section on the auxiliary connection direction of scanning is non-linear in the cross section on main scanning direction, and
Curved transition in the cross section of this double-curved surface on sub scanning direction is asymmetric about the optical axis of these lens.
24. scanning optics as claimed in claim 21, wherein scanning optics satisfies 4.5＜L/d0＜7.5, wherein the distance of the incidence surface from the reflection spot on the reflecting surface of optical deflector to lens is d0, is L from exit surface to the distance that scans target surface of lens.
25. scanning optics as claimed in claim 21, wherein scanning optics satisfies | R1|＞| R2| and | r1|＞| r2|, wherein the radius-of-curvature of the first surface of lens on main scanning direction is R1, the radius-of-curvature of the second surface of lens on main scanning direction is R2, the radius-of-curvature of described first surface on sub scanning direction is r1, and the radius-of-curvature of described second surface on sub scanning direction is r2.
26. scanning optics as claimed in claim 21, wherein scanning optics satisfies Fs/W＜0.005, and wherein effectively writing width is W, and the width that effectively writes the subscan field curvature in the width is Fs.
27. scanning optics as claimed in claim 21, wherein scanning optics be configured to have utilize luminous point on the main scanning direction with the function of this scanning target surface of even speed optical scanning basically with revise the function of the face disparity error of the optical deflector that is used for laser scanning on sub scanning direction.
28. scanning optics as claimed in claim 21, wherein the material of lens comprises resin.
29. scanning optics as claimed in claim 21, wherein the optical axis of lens is with respect to the normal slope of scanning target surface.
30. scanning optics as claimed in claim 21, wherein many light beams of deflection simultaneously are converged to a plurality of luminous points that separate on sub scanning direction on the scanning target surface.
31. a scanning optics, it utilizes single lens to be converged on the scanning target surface by the divergence light flux of optical deflector at the main scanning direction upper deflecting, and this scanning optics comprises single lens, wherein
This scanning optics satisfies | R1|＞| R2| and | r1|＞| r2|, wherein the radius-of-curvature of the first surface of lens on main scanning direction is R1, the radius-of-curvature of the second surface of lens on main scanning direction is R2, the radius-of-curvature of described first surface on sub scanning direction is r1, the radius-of-curvature of described second surface on sub scanning direction is r2, and
In the described surface more a surface near optical deflector be the iso-curvature surface, wherein the curvature in the cross section on sub scanning direction is constant along main scanning direction.
32. scanning optics as claimed in claim 31, wherein
One of them described surface is a double-curved surface, and wherein the line of the center of curvature in the cross section on the auxiliary connection direction of scanning is non-linear in the cross section on main scanning direction, and
Curved transition in the cross section of this double-curved surface on sub scanning direction is asymmetric about the optical axis of these lens.
33. scanning optics as claimed in claim 32, wherein said lens surface is a textured surface.
34. scanning optics as claimed in claim 33, wherein lens configuration becomes to have the biconvex shape on main scanning direction and sub scanning direction.
35. scanning optics as claimed in claim 31, wherein scanning optics satisfies 4.5＜L/d0＜7.5, wherein the distance of the incidence surface from the reflection spot on the reflecting surface of optical deflector to lens is d0, is L from exit surface to the distance that scans target surface of lens.
36. scanning optics as claimed in claim 31, wherein scanning optics satisfies Fs/W＜0.005, and wherein effectively writing width is W, and the width that effectively writes the subscan field curvature in the width is Fs.
37. scanning optics as claimed in claim 31, wherein scanning optics be configured to have utilize luminous point on the main scanning direction with the function of this scanning target surface of substantially constant speed optical scanning with revise the function of the face disparity error of the optical deflector that is used for laser scanning on sub scanning direction.
38. scanning optics as claimed in claim 31, wherein the material of lens comprises resin.
39. scanning optics as claimed in claim 31, wherein lens axis is with respect to the normal slope of scanning target surface.
40. scanning optics as claimed in claim 31, wherein many light beams of deflection simultaneously are converged to a plurality of luminous points that separate on sub scanning direction on the scanning target surface.
41. a scanning optics, it utilizes single lens to be converged on the scanning target surface by the divergence light flux of optical deflector at the main scanning direction upper deflecting, and this scanning optics comprises single lens, wherein
This scanning optics satisfies 4.5＜L/d0＜7.5, and wherein the distance of the incidence surface from the reflection spot on the reflecting surface of optical deflector to lens is d0, is L from exit surface to the distance that scans target surface of lens,
This scanning optics satisfies | R1|＞| R2| and | r1|＞| r2|, wherein the radius-of-curvature of the first surface of lens on main scanning direction is R1, the radius-of-curvature of the second surface of lens on main scanning direction is R2, the radius-of-curvature of described first surface on sub scanning direction is r1, the radius-of-curvature of described second surface on sub scanning direction is r2, and
One of them of a lens described surface is a textured surface.
42. scanning optics as claimed in claim 41, wherein lens are configured to have two surfaces that are the biconvex shape on main scanning direction and sub scanning direction.
43. scanning optics as claimed in claim 42, wherein
At least one described surface is a double-curved surface, and wherein the line of the center of curvature in the cross section on the auxiliary connection direction of scanning is non-linear in the cross section on main scanning direction, and
Curved transition in the cross section of this double-curved surface on sub scanning direction is asymmetric about the optical axis of these lens.
44. scanning optics as claimed in claim 43, in the wherein said surface more a surface near optical deflector be the iso-curvature surface, wherein the curvature in the cross section on sub scanning direction is constant along main scanning direction.
45. scanning optics as claimed in claim 41, wherein scanning optics satisfies Fs/W＜0.005, and wherein effectively writing width is W, and the width that effectively writes the subscan field curvature in the width is Fs.
46. scanning optics as claimed in claim 41, wherein scanning optics be configured to have utilize luminous point on the main scanning direction with the function of this scanning target surface of substantial constant speed optical scanning with revise the function of the face disparity error of the optical deflector that is used for laser scanning on sub scanning direction.
47. scanning optics as claimed in claim 41, wherein the material of lens comprises resin.
48. scanning optics as claimed in claim 41, wherein optical axis is with respect to the normal slope of scanning target surface.
49. scanning optics as claimed in claim 41, wherein many light beams of deflection simultaneously are converged to a plurality of luminous points that separate on sub scanning direction on the scanning target surface.
50. a single beam optical scanner comprises:
Light source, it is configured to send luminous flux;
Coupled lens, it is configured to make this luminous flux and subsequent optical system coupled;
Optical deflector, it is configured to fixed angles speed deflected luminous flux;
The line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux that is coupled is imaged as line image, and this line image is long along main scanning direction; And
Scanning optics as claimed in claim 1.
51. a single beam optical scanner comprises:
Light source, it is configured to send luminous flux;
Coupled lens, it is configured to make this luminous flux and subsequent optical system coupled;
Optical deflector, it is configured to fixed angles speed deflected luminous flux;
The line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux that is coupled is imaged as line image, and this line image is long along main scanning direction; And
Scanning optics as claimed in claim 11.
52. a single beam optical scanner comprises:
Light source, it is configured to send luminous flux;
Coupled lens, it is configured to make this luminous flux and subsequent optical system coupled;
Optical deflector, it is configured to fixed angles speed deflected luminous flux;
The line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux that is coupled is imaged as line image, and this line image is long along main scanning direction; And
Scanning optics as claimed in claim 21.
53. a single beam optical scanner comprises:
Light source, it is configured to send luminous flux;
Coupled lens, it is configured to make this luminous flux and subsequent optical system coupled;
Optical deflector, it is configured to fixed angles speed deflected luminous flux;
The line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux that is coupled is imaged as line image, and this line image is long along main scanning direction; And
Scanning optics as claimed in claim 31.
54. a single beam optical scanner comprises:
Light source, it is configured to send luminous flux;
Coupled lens, it is configured to make this luminous flux and subsequent optical system coupled;
Optical deflector, it is configured to fixed angles speed deflected luminous flux;
The line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux that is coupled is imaged as line image, and this line image is long along main scanning direction; And
Scanning optics as claimed in claim 41.
55. a multi-beam optical scanning device comprises:
A plurality of light sources, it is configured to send luminous flux;
Coupled lens, it is configured to make described luminous flux and subsequent optical system coupled;
Optical deflector, it is configured to the deflected luminous flux simultaneously of fixed angles speed basically;
The concentric line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux of coupling is imaged as a plurality of line images, described a plurality of line images along main scanning direction long and on sub scanning direction separately; And
Scanning optics as claimed in claim 10.
56. multi-beam optical scanning device as claimed in claim 55, wherein
Light source comprises the integral semiconductor laser array of wherein arranging a plurality of light emitting sources.
57. a multi-beam optical scanning device comprises:
A plurality of light sources, it is configured to send luminous flux;
Coupled lens, it is configured to make described luminous flux and subsequent optical system coupled;
Optical deflector, it is configured to the angular velocity while deflected luminous flux with substantial constant;
The concentric line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux of coupling is imaged as a plurality of line images, described a plurality of line images along main scanning direction long and on sub scanning direction separately; And
Scanning optics as claimed in claim 40.
58. multi-beam optical scanning device as claimed in claim 57, wherein
Light source comprises the integral semiconductor laser array of wherein arranging a plurality of light emitting sources.
59. a multi-beam optical scanning device comprises:
A plurality of light sources, it is configured to send luminous flux;
Coupled lens, it is configured to make described luminous flux and subsequent optical system coupled;
Optical deflector, it is configured to the angular velocity while deflected luminous flux with substantial constant;
The concentric line imaging optical system, it is configured near the reflecting surface of optical deflector the luminous flux of coupling is imaged as a plurality of line images, described a plurality of line images along main scanning direction long and on sub scanning direction separately; And
Scanning optics as claimed in claim 49.
60. multi-beam optical scanning device as claimed in claim 59, wherein
Light source comprises the integral semiconductor laser array of wherein arranging a plurality of light emitting sources.
61. an imaging device comprises:
The bearing member, image carrier;
Optical scanner, it is configured to this bearing member, image carrier of optical scanning to form sub-image; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 50 as optical scanner.
62. an imaging device comprises:
The bearing member, image carrier;
Optical scanner, it is configured to this bearing member, image carrier of optical scanning to form sub-image; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 51 as optical scanner.
63. an imaging device comprises:
The bearing member, image carrier;
Optical scanner, it is configured to this bearing member, image carrier of optical scanning to form sub-image; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 52 as optical scanner.
64. an imaging device comprises:
The bearing member, image carrier;
Optical scanner, it is configured to this bearing member, image carrier of optical scanning to form sub-image; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 53 as optical scanner.
65. an imaging device comprises:
The bearing member, image carrier;
Optical scanner, its image-carrier that is configured to this sensitization of optical scanning is to form sub-image; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 54 as optical scanner.
66. an imaging device comprises:
The bearing member, image carrier;
Optical scanner, its image-carrier that is configured to this sensitization of optical scanning is to form sub-image; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 55 as optical scanner.
67. an imaging device comprises:
The bearing member, image carrier;
Optical scanner, it is configured to this bearing member, image carrier of optical scanning to form sub-image; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 57 as optical scanner.
68. an imaging device comprises:
The bearing member, image carrier;
Optical scanner, it is configured to this bearing member, image carrier of optical scanning to form sub-image; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 59 as optical scanner.
69. a coloured image forms device, comprises
A plurality of bearing member, image carriers;
Optical scanner, it is configured to optical scanning bearing member, image carrier, to form at least one sub-image corresponding to each color;
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 50 as optical scanner.
70. a coloured image forms device, comprises
A plurality of bearing member, image carriers;
Optical scanner, it is configured to optical scanning bearing member, image carrier, to form at least one sub-image corresponding to each color; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 51 as optical scanner.
71. a coloured image forms device, comprises
A plurality of bearing member, image carriers;
Optical scanner, it is configured to optical scanning bearing member, image carrier, to form at least one sub-image corresponding to each color; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 52 as optical scanner.
72. a coloured image forms device, comprises
A plurality of bearing member, image carriers;
Optical scanner, it is configured to optical scanning bearing member, image carrier, to form at least one sub-image corresponding to each color; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 53 as optical scanner.
73. a coloured image forms device, comprises
A plurality of bearing member, image carriers;
Optical scanner, it is configured to optical scanning bearing member, image carrier, to form at least one sub-image corresponding to each color; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 54 as optical scanner.
74. a coloured image forms device, comprises
A plurality of bearing member, image carriers;
Optical scanner, it is configured to optical scanning bearing member, image carrier, to form at least one sub-image corresponding to each color; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 55 as optical scanner.
75. a coloured image forms device, comprises
A plurality of bearing member, image carriers;
Optical scanner, it is configured to optical scanning bearing member, image carrier, to form at least one sub-image corresponding to each color; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 57 as optical scanner.
76. a coloured image forms device, comprises
A plurality of bearing member, image carriers;
Optical scanner, it is configured to optical scanning bearing member, image carrier, to form at least one sub-image corresponding to each color; And
Developing cell, its described sub-image that is configured to develop, wherein
Adopt optical scanner as claimed in claim 59 as optical scanner.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP044661/05 | 2005-02-21 | ||
| JP2005044661 | 2005-02-21 | ||
| JP091795/05 | 2005-03-28 | ||
| JP138243/05 | 2005-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1825162A true CN1825162A (en) | 2006-08-30 |
Family
ID=36935910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610004123 Pending CN1825162A (en) | 2005-02-21 | 2006-02-21 | Scanning optical system, optical scanner, and image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1825162A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7643191B2 (en) | 2006-10-18 | 2010-01-05 | Ricoh Company, Ltd. | Optical scanner and image forming apparatus |
| CN102012533A (en) * | 2009-09-08 | 2011-04-13 | 株式会社理光 | Plastic optical element, optical scanning device, and image forming apparatus |
| CN102356336A (en) * | 2009-03-19 | 2012-02-15 | 柯尼卡美能达精密光学株式会社 | Hollow reflecting optical element and scanning optical device |
| CN101533154B (en) * | 2008-03-14 | 2013-05-08 | 株式会社理光 | Optical scanning device, optical scanning method, and image forming apparatus, using the optical scanning device |
| CN107257931A (en) * | 2015-02-20 | 2017-10-17 | 苹果公司 | Actuating optical components for beam scanning apparatus |
| CN109491077A (en) * | 2018-12-29 | 2019-03-19 | 珠海奔图电子有限公司 | Optical scanning device and electronic imaging apparatus |
| CN116609938A (en) * | 2023-07-14 | 2023-08-18 | 南通唐人电子科技有限公司 | Rotary mirror setting method and device based on optical scanning focal point position control |
-
2006
- 2006-02-21 CN CN 200610004123 patent/CN1825162A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7643191B2 (en) | 2006-10-18 | 2010-01-05 | Ricoh Company, Ltd. | Optical scanner and image forming apparatus |
| CN101533154B (en) * | 2008-03-14 | 2013-05-08 | 株式会社理光 | Optical scanning device, optical scanning method, and image forming apparatus, using the optical scanning device |
| CN102356336A (en) * | 2009-03-19 | 2012-02-15 | 柯尼卡美能达精密光学株式会社 | Hollow reflecting optical element and scanning optical device |
| CN102356336B (en) * | 2009-03-19 | 2013-11-20 | 柯尼卡美能达精密光学株式会社 | Hollow reflecting optical element and scanning optical device |
| CN102012533A (en) * | 2009-09-08 | 2011-04-13 | 株式会社理光 | Plastic optical element, optical scanning device, and image forming apparatus |
| US8457530B2 (en) | 2009-09-08 | 2013-06-04 | Ricoh Company, Ltd. | Plastic optical element, optical scanning device, and image forming apparatus |
| CN107257931A (en) * | 2015-02-20 | 2017-10-17 | 苹果公司 | Actuating optical components for beam scanning apparatus |
| CN107257931B (en) * | 2015-02-20 | 2020-09-22 | 苹果公司 | Actuated optical element for optical beam scanning apparatus |
| CN109491077A (en) * | 2018-12-29 | 2019-03-19 | 珠海奔图电子有限公司 | Optical scanning device and electronic imaging apparatus |
| CN116609938A (en) * | 2023-07-14 | 2023-08-18 | 南通唐人电子科技有限公司 | Rotary mirror setting method and device based on optical scanning focal point position control |
| CN116609938B (en) * | 2023-07-14 | 2024-03-15 | 南通唐人电子科技有限公司 | Rotary mirror setting method and device based on optical scanning focal point position control |
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Open date: 20060830 |