CN100447613C - Optical scanner and image forming apparatus - Google Patents
Optical scanner and image forming apparatus Download PDFInfo
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- CN100447613C CN100447613C CNB2005101343033A CN200510134303A CN100447613C CN 100447613 C CN100447613 C CN 100447613C CN B2005101343033 A CNB2005101343033 A CN B2005101343033A CN 200510134303 A CN200510134303 A CN 200510134303A CN 100447613 C CN100447613 C CN 100447613C
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Abstract
The invention provides an optical scanning device and an image forming device equipped with the optical scanning device which can really prevent dazzle and guarantee image quality without causing noise increasing and temperature rising, and has simple structure and low cost. The optical scanning device is equipped with a light source unit, a single revolving deflector, and scanning optical systems (a scanning lens and a back-refraction mirror), each scanning optical system is disposed symmetrically relative to the center line of the revolving deflector in the vertical direction, each optical unit, the revolving deflector and each scanning optical system are arranged in a single optic casing body, the revolving deflector is arranged at the inner side of a containing chamber formed in the optic casing body, light shading parts for preventing the revolving deflector from being scanned and deflected and preventing light beams from being reflected and scattered by each scanning optical system at the opposite side are arranged in the inner side of the optic casing body, and the light shading parts are arranged outside the containing chamber.
Description
Technical field
The image processing system that the present invention relates to light scanning apparatus and have this light scanning apparatus, in more detail, the present invention relates to deflection mechanism make from each beam deflection scanning back of a plurality of light source outgoing each self-corresponding be scanned the light scanning apparatus of photoscanning on the face and have this light scanning apparatus, by carry out the image processing system of duplicating machine, printer, facsimile recorder, plotting apparatus that writing of sub-image form multicolor image or the unit mahine that possesses these a plurality of functions etc. in the face that the is scanned photoscanning of a plurality of image carriers that are set up in parallel.
Background technology
To a plurality of image carriers that are set up in parallel (for example make from each light beam irradiates of a plurality of light source outgoing, photosensitive drums) on, carry out the formation of sub-image, with the developer of different colours (for example, the toner of black, dark red, dark green, yellow 4 kinds of colors) respectively the sub-image that forms on each image carrier is developed and after visual, but make the video of all kinds that forms on each image carrier and duplicating material etc. overlap reflex make parallel type coloured image formation device multicolor image, so-called widely known to.
With regard to this parallel type coloured image forms device, though the method that also known utilization exposes respectively and scans by a plurality of light scanning apparatuss of each image carrier setting, but under this occasion, because a plurality of rotation deflectors that constitute by polygonal mirror and its drive motor that need be corresponding, thereby aspect cost, be disadvantageous with each image carrier.In addition,, need bigger space, thereby also can produce the problem that image processing system itself maximizes in order to dispose a plurality of light scanning apparatuss.Also have, the rotation deflector is also referred to as light deflector.
In order to address the above problem, known method has: the mechanism as scanning that a plurality of image carriers are exposed changes single rotation deflector with a plurality of light sources, to the scanning (for example, with reference to patent documentation 1 to 3) that exposes simultaneously of each image carrier jointly.
With reference to Fig. 8 and Fig. 9, to open the optical writing device (hereinafter referred to as ' light scanning apparatus ') that the 2002-196269 communique put down in writing be that example illustrates original problem points with for example special.In two figure, the original light scanning apparatus of symbol 500 expressions.Light scanning apparatus 500 is the center with single rotation deflector 62, possessing the light source cell 52～55 of light source and the 1st imaging with lens (below rename as ' scanning lens ') 63,64 with its position configuration that roughly is symmetry, will from the light beam L1～L4 of light source cell 52～55 to the left and right all directions separately, scanning exposes.
Light beam L1～L4 from 4 light source cells 52～55 is deflected scanning by the rotation deflector 62 along direction of arrow rotation among Fig. 8 in 2 directions of symmetry with being divided into 2 light beams.So the scanning optics of the light beam of deflection scanning by being turned back by scanning lens 63,64 and light path and constituting with mirror 65～68 etc. is scanned (not shown) imaging on the face at each of 4 image carriers.Also have, in Fig. 8, the wall of symbol 95 expression light-blocking members 89,90.
With regard to this light scanning apparatus 500, rotation deflector 62 can be made single device, thereby can reduce cost, compare with image processing system simultaneously with a plurality of light scanning apparatuss, can make equipment miniaturization.Yet, in having the light scanning apparatus of above-mentioned formation (so-called subtend sweep type light scanning apparatus), owing to is each optical system of center balanced configuration, thereby have the situation that becomes problem from the dazzle meeting of the optical system of mutual subtend with illustrated rotation deflector 62.For example, in the plane of incidence lateral reflection of the scanning lens 63,64 that accompanies rotation deflector 62 mutual subtends or the occasion of scattered beam, this veiling glare becomes dazzle, advance to opposite direction, enter the optical system of opposing side, shine on the image carrier of the scanning that should not expose originally, become ghost image or stripe pattern thus, cause image quality to decline to a great extent.
In order to address this is that, the known spy of having open flat 10-148781 number, the spy opens 2002-196269 number and the spy opens 2003-202515 communique etc.
For example, it is not make the noise that polygonal mirror causes and the deterioration of beating of main scanning direction about removing dazzle effectively that the spy opens technology that the 2003-202515 communique puts down in writing, can form the light scanning apparatus of high quality image and use the coloured image of this light scanning apparatus to form device with easy parts such as plastic lenss.In this technology, the light path of the incident beam by the left-hand tools deflector and be rotated deflector reflection deflection and incide the effective coverage that accompanies between the light path of the scanning light beam on the face of being scanned and light-blocking member is set prevents dazzle.Handle as previously mentioned by the place that light-blocking member will be set, make and leave rotation deflector ground configuration light-blocking member and become possibility, thereby can reduce the noise of the antitriptic wind sound that the rotation of rotating deflector causes.
It is about optical writing device and image processing system that the spy opens the technology that the 2002-196269 communique put down in writing, with a rotation deflector with multiple light beams in 2 directions of symmetry separately and in the optical writing device of deflection scanning, even accompany the dazzle that the optical system of rotation deflector ground subtend causes, can prevent that also this dazzle from entering the optical system of opposing side.This technology is characterised in that: utilize single rotation deflector, outside the zone of deflection scanning the sort of light-blocking member shown in Figure 8 89,90 is set.
In addition, the spy to open the technology of being put down in writing for flat 10-148781 number be the light-beam scanner that prevents to make optical axis almost parallel ground to incide another scanned imagery optical system with respect to a reflection veiling glare that causes of 2 scanned imagery optical systems of polygonal rotating mirror balanced configuration and become noise about alleviating.
[patent documentation 1] spy opens flat 10-148781 communique
[patent documentation 2] spy opens the 2002-196269 communique
[patent documentation 3] spy opens the 2003-202515 communique
Yet, open in the technology that the 2003-202515 communique put down in writing the spy, in order to prevent all dazzles, need be with light-blocking member extremely near the ground configuration of rotation deflector, do not cover original light beam in order only to cover dazzle, just require very high parts precision, simultaneously the problem that also can cause component costs to rise from the result.
In addition, in the configuration of the light-blocking member of the embodiment that utilizes this technology,, still must dispose light-blocking member, therefore still have the problem of the antitriptic wind sound that the rotation of rotation deflector causes near the rotation deflector in order to block all dazzles.
In addition, what become problem this moment not only is antitriptic wind sound, and also has near the temperature the caused rotation deflector of windage loss that produces because of the rotation of rotating deflector to rise.That is, by near the rotation deflector light-blocking member being set, the pressure of air-flow can locally increase, and the result produces the temperature that causes because of windage loss and rises.The temperature rising of this rotation deflector installation portion can cause the action stability of rotation deflector itself and the reduction in life-span, propagate because of heat transmission simultaneously to scanning optics, the imaging performance and the look overlapping accuracy that cause scanning optics reduce (being so-called color fringe), make image quality significantly descend.Especially, form in the device at the coloured image that possesses this light scanning apparatus, this influence greatly.
In addition, the technology of opening in the 2002-196269 communique to be put down in writing the spy is characterised in that: about the noise that proposes as the problems referred to above, adopted the formation that makes the space of air-flow escape in the light-blocking member setting, owing to still, still can not solve the problem that noise and temperature rise fully near rotation deflector configuration light-blocking member.
In addition, in the time of in the light-blocking member in this technology being integrally formed at the optical housing that possesses the rotation deflector, as optical housing if prefer when adopting cheap synthetic resin, then mould constitutes the complexity that becomes, and (part that is equivalent to the shading wall of light-blocking member becomes undercutting or cut-out) can cause cost to increase on the contrary.
Summary of the invention
The present invention is In view of the foregoing and the research of carrying out, the image processing system that its fundamental purpose provides a kind of light scanning apparatus and possesses this light scanning apparatus, this light scanning apparatus solves above-mentioned the problems of the prior art, positively prevent to be also referred to as the dazzle of reflection veiling glare, can not cause simultaneously the increase of noise and the rising of temperature, promptly can not cause the action stability of rotation deflector itself and the reduction in life-span, do not have the reduction (so-called color fringe) that causes the imaging performance and the look overlapping accuracy of scanning optics because of heat transmission to scanning optics, can guarantee image quality, and constitute simple, cost is low.
In addition, its purpose also is to provide a kind of image processing system that plays the light scanning apparatus of aftermentioned effect and possess this light scanning apparatus.
To realize above-mentioned purpose simultaneously in order addressing the above problem, in the invention of each scheme, to adopt mechanism to invent specific item (hereinafter referred to as ' formation ') with following feature.
The invention that scheme 1 is put down in writing is a kind of light scanning apparatus, possesses a plurality of light source mechanism, the single deflection mechanism that will scan and with each self-corresponding is scanned on the face of the beam direction of scanning and the optical system mechanism of imaging from each beam deflection of this a plurality of light source mechanism, this optical system mechanism of center balanced configuration with respect to above-mentioned deflection mechanism, and in single casing mechanism, possesses above-mentioned a plurality of light source mechanism, above-mentioned deflection mechanism and above-mentioned each optical system mechanism, it is characterized in that, in above-mentioned casing mechanism, be provided with and prevent by the light beam of above-mentioned deflection mechanism deflection scanning by the above-mentioned optical system mechanism's reflection of subtend or the chopping mechanism of scattering separately, with above-mentioned chopping mechanism be configured in formation upwards state from above-mentioned a plurality of light source mechanism deflection mechanism incident light light beam and from above-mentioned deflection mechanism between the light beam of above-mentioned optical system mechanism deflection scanning.
At this,, comprise that for example suitably airtight beyond the light-blocking member possesses the thing as a form of gel etc. of semi-solid of diminished reflex for example or scattered light (dazzle) function or (same down) such as objects of liquid as chopping mechanism.
The invention that scheme 2 is put down in writing also has following feature in the light scanning apparatus that scheme 1 is put down in writing: above-mentioned deflection mechanism is disposed at the inboard of the retractable room that forms in above-mentioned casing mechanism, above-mentioned chopping mechanism is configured in the outside of above-mentioned retractable room.
At this, so-called " retractable room that forms in the casing mechanism " means and comprises occasion that retractable room and casing mechanism are integrally formed and the retractable room occasion (same down) with respect to the other formation of casing mechanism.
The retractable room of folding and unfolding configuration deflection mechanism (for example, rotating deflector etc.) forms (down together) by wall with surrounding as the figure that represents the aftermentioned embodiment expresses.
The invention that scheme 3 is put down in writing is a kind of light scanning apparatus, possesses a plurality of light source mechanism, the single deflection mechanism that will scan and with each self-corresponding is scanned on the face of the beam direction of scanning and the optical system mechanism of imaging from each beam deflection of this a plurality of light source mechanism, this optical system mechanism of center balanced configuration with respect to above-mentioned deflection mechanism, and in single casing mechanism, possesses above-mentioned a plurality of light source mechanism, above-mentioned deflection mechanism and above-mentioned each optical system mechanism, it is characterized in that, above-mentioned deflection mechanism is disposed at the inboard of the retractable room that forms on above-mentioned casing mechanism, in above-mentioned casing mechanism, be provided with and prevent from by the light beam of above-mentioned deflection mechanism deflection scanning above-mentioned chopping mechanism to be configured in the outside of above-mentioned retractable room by the above-mentioned optical system reflection of subtend or the chopping mechanism of scattering separately.
The invention that scheme 4 is put down in writing is in scheme 1,2 or 3 light scanning apparatuss of being put down in writing, and also has following feature: above-mentioned chopping mechanism be clipped between each scanning lens that is arranged in the above-mentioned optical system mechanism in that almost each is configured at a place on the position of symmetry about the center of above-mentioned deflection mechanism.
The invention that scheme 5 is put down in writing is in scheme 2,3 or 4 light scanning apparatuss of being put down in writing, and also have following feature: above-mentioned chopping mechanism is made up of light-blocking member, and this light-blocking member and above-mentioned retractable room are one-body molded with above-mentioned casing mechanism together.
The invention that scheme 6 is put down in writing is in the light scanning apparatus that scheme 5 is put down in writing, and also has following feature: the inwall of above-mentioned retractable room and outer wall be double do prevent that above-mentioned optical system mechanism from producing with respect to the optical axis center of above-mentioned each optical system mechanism to the reflection that does not have above-mentioned a plurality of light source mechanism one side or the light-blocking member of scattered light.
The invention that scheme 7 is put down in writing is in any one light scanning apparatus of putting down in writing, also to have following feature in scheme 2 to 5: the transmittance that is provided with transmitance and sound isolation property in the above-mentioned retractable room by the effective scanning scope of the light beam of above-mentioned deflection mechanism deflection scanning hides the line part.
The invention that scheme 8 is put down in writing is that also have following feature: above-mentioned casing mechanism forms with resin in scheme 1 to 7 any one light scanning apparatus of putting down in writing.
If not as wishing to form the aftermentioned effect that casing mechanism reached in ground, in scheme 1 to 6, also comprise with for example mold casting forming product beyond the resin certainly forming with resin.
The invention that scheme 9 is put down in writing is in the light scanning apparatus that scheme 8 is put down in writing, and also has following feature: fusion absorbs the reflection that above-mentioned optical system mechanism causes or the pigment of scattered light in above-mentioned resin.
The invention that scheme 10 is put down in writing is in any one light scanning apparatus of putting down in writing, also to have following feature in scheme 2 to 9: on the internal face of above-mentioned retractable room, form the circle that does not have the angle in its full week.
The invention that scheme 11 is put down in writing is in any one light scanning apparatus of putting down in writing, also to have following feature in scheme 2 to 10: with the above-mentioned at least retractable room of the airtight above-mentioned casing mechanism of cover.
The invention that scheme 12 is put down in writing is in the light scanning apparatus that scheme 11 is put down in writing, and also has following feature: above-mentioned cover is metal.
The invention that scheme 13 is put down in writing is a kind of image processing system, has following feature: have in the scheme 1 to 12 any one light scanning apparatus of putting down in writing and possess the above-mentioned a plurality of image carriers that are scanned face.
According to the present invention, can provide the new light scanning apparatus and the image processing system that address the above problem.If it is enumerate main invention effect, then as described below.
According to the present invention, same with the prior art of reference Fig. 8 explanation, certainly can prevent dazzle, and owing to chopping mechanism being disposed further with respect to deflection mechanism and can obtaining same effect, thereby the antitriptic wind sound that the rotation that can reduce deflection mechanism (for example rotating deflector) causes prevents the increase (scheme 1) of the antitriptic wind sound that chopping mechanism causes.
According to the present invention, same with the prior art of reference Fig. 8 explanation, certainly can prevent dazzle, and owing to the outside that chopping mechanism is disposed at the retractable room of inboard configuration folding and unfolding deflection mechanism, thereby the outer wall by retractable room blocks the antitriptic wind sound that the rotation by deflection mechanism (for example rotating deflector) produces, chopping mechanism can not increase antitriptic wind sound, can further reduce noise (scheme 2,3) with comparing originally.
According to the present invention, because chopping mechanism is clipped in each the scanning lens ground that is provided with in the optical system mechanism and almost respectively is configured at a place position of symmetry at the center about deflection mechanism, thereby the chopping mechanism that can utilize the subtend prevents from the dazzle that enters from the gap between chopping mechanism and the deflection mechanism from can more positively prevent dazzle.In addition, by almost disposing chopping mechanism symmetrically, can both obtain same effect (scheme 4) for the scanning optics that with the deflection mechanism is any side about the center.
According to the present invention, because chopping mechanism is made of light-blocking member, this light-blocking member and retractable room are one-body molded with casing mechanism together, thereby can not cause the increase of part count, and cheap light scanning apparatus (scheme 5) can be provided.
According to the present invention, since the inwall of retractable room and outer wall be double do prevent that optical system mechanism from producing with respect to the optical axis center of each optical system mechanism to the reflection that does not have a plurality of light source mechanism one side or the light-blocking member of scattered light, thereby can be really in the whole zone of the effective scanning scope of each optical system mechanism (for example scanning optics) and prevent dazzle with the formation of cheapness, simultaneously can suppress part count, and casing mechanism itself can be made simple formation (scheme 6).
According to the present invention, hide the line part owing in retractable room, be provided with the transmittance of transmitance and sound isolation property by the effective scanning scope of the light beam of deflection mechanism deflection scanning, can further reduce noise (scheme 7).
According to the present invention, owing to form casing mechanism with resin, thus can further reduce component costs (scheme 8).
According to the present invention, because the reflection that fusion absorption optics system authority causes in the resin that forms casing mechanism or the pigment of scattered light, thereby positively reflection attenuation or scattered light (dazzle) (scheme 9) finished at an easy rate with the simplest formation.
According to the present invention, do not have the circle at angle owing on the internal face of above-mentioned retractable room, form, thereby can further reduce the antitriptic wind sound (scheme 10) that the rotation of deflection mechanism (for example rotating deflector) causes in its full week.
According to the present invention, because with the retractable room at least of cover closed shell mechanism, thereby can further reduce the antitriptic wind sound (scheme 11) that the rotation of deflection mechanism (for example rotating deflector) causes.
According to the present invention, because cover is metal, thereby utilize the thermolysis of metal, can suppress temperature rising (scheme 12) because of the rotation generation of deflection mechanism (for example rotating deflector).
According to the present invention, have any one light scanning apparatus put down in writing and the image processing system that possesses a plurality of image carriers of the face of being scanned in the scheme 1 to 12 by making, simple formation and image processing system more cheaply can be accessed, the reduction (scheme 13) of the image quality of striped picture that reflection or scattered light (dazzle) cause or ghost etc. and so on can be eliminated simultaneously really.
Description of drawings
Fig. 1 is the vertical view of major part of the light scanning apparatus of expression one embodiment of the present invention.
Fig. 2 is the stereographic map of upper side of the light scanning apparatus of Fig. 1.
Fig. 3 is the vertical view of the light scanning apparatus of Fig. 1.
Fig. 4 is the vertical view of the light scanning apparatus of expression modified example 1.
Fig. 5 is the stereographic map of upper side of the light scanning apparatus of expression modified example 2.
Fig. 6 is the upward view of the light scanning apparatus of Fig. 5.
Fig. 7 is the longitudinal section of the light scanning apparatus of Fig. 5.
Fig. 8 is the vertical view of the major part of existing light scanning apparatus.
Fig. 9 is the summary front view of existing image processing system with light scanning apparatus of Fig. 8.
Figure 10 is the simple partial cross section front view that is used to illustrate the installment state of the case cover of light scanning apparatus of expression modified example 3 and metal cap.
Among the figure:
1,2,3, the 4-image carrier, 5-light scanning apparatus (photoscanning light writes mechanism), 10,11,12,13-developing apparatus (developing mechanism), 14,15,16,17-reproducing unit (duplicating mechanism), 26-fixing device (fixing mechanism), 35,36-light-blocking member (chopping mechanism), 50-optical housing (casing mechanism), the 51-retractable room, the inwall of 51a-retractable room (face), the outer wall of 51b-retractable room (face), 52,53,54,55-light source or light source cell (light source mechanism), 62-rotates deflector (deflection mechanism), 63,64-scanning lens (optical system mechanism), 65～68 light paths are turned back with mirror (optical system mechanism), 78,78A-covers (cover), the soundproof glass of 79-(transmittance hides the line part), L1, L2, L3, the L4-light beam, Fa, Fb, Fc, Fd-dazzle (reflection or scattered light)
Embodiment
Following with reference to the description of drawings embodiments of the present invention.In above-mentioned prior art example, embodiment and modified example etc., for inscape with the also identical parts of same function and shape etc. and allocation position and component parts etc., by giving, omit its explanation as far as possible with prosign and after explanation once.In order to realize the simplification of accompanying drawing and explanation, even the also suitable parts that explanatorily do not omit the inscape of this expression among the figure in advance but there is no need in the figure to specify.When the inscape of quoting publication communique etc. illustrates, the additional bracket of its symbol is represented, to distinguish the inscape of each embodiment etc.
At first, with reference to Fig. 8 and Fig. 9, the basic comprising action that possesses the image processing system of using light scanning apparatus of the present invention is described.
Image processing system shown in Figure 9 is that the full-colour image that is set up in parallel the photoconductivity photoreceptor (hereinafter referred to as ' photosensitive drums ') 1,2,3,4 of a plurality of a plurality of drum types as image carrier forms device.These 4 photosensitive drums the 1,2,3, the 4th for example form photosensitive drums with yellow (Y), dark red (M), viridescent (C), black (Bk) corresponding image of all kinds according to from right to left order in the drawings.In addition, the order of color is not limited thereto certainly and can sets arbitrarily.
4 photosensitive drums 1,2,3,4 each around, be provided with lower device as being used for carrying out the device that image forms by electrostatic copying process: as each photosensitive drums 1,2,3,4 common be also referred to as the optical writing device that light writes the light scanning mechanism of mechanism (below rename as ' light scanning apparatus ') 500; Charging system (charged roller, charged brush, charged charger etc.) 6,7,8,9 as charged mechanism; Developing apparatus (developer of all kinds of Y, M, C, Bk) 10,11,12,13 as developing mechanism; Possess as being hung on and duplicate duplicating carry strap 22a and duplicating Handling device 22 of carrying mechanism between each roller as the reproducing unit (duplicate roller, duplicate brush etc.) 14,15,16,17 that is configured in the duplicating mechanism at its back side; And as the cleaning device of cleaning mechanism (cleaning blade, cleaning brush etc.) 18,19,20,21 etc., on these photosensitive drums 1,2,3,4, can carry out image of all kinds and form.
Developing apparatus 10,11,12,13 has that the function of visual developing mechanism constitutes as with the developer of different colours the sub-image that forms being developed on each photosensitive drums 1,2,3,4.Reproducing unit 14,15,16,17 and duplicate Handling device 22 and have but the duplicating material as sheet recording medium is transported on the position of each photosensitive drums 1,2,3,4 successively, makes the video of all kinds that forms on each photosensitive drums 1,2,3,4 overlap the function formation of the duplicating mechanism that duplicates with duplicating material.
As Fig. 8 and shown in Figure 9, light scanning apparatus 500 (for example, being equivalent to Fig. 1 to Fig. 4 that the spy opens 2002-196269 communique light scanning apparatus (5) shown in waiting) possesses: as 4 light source cells 52,53,54,55 of a plurality of light source mechanism; As from light beam L1, the L2 of each light source cell 52,53,54,55, L3, L4 separate the deflection mechanism of deflection scanning in 2 directions of symmetry rotation deflector 62; And as being that the center disposes symmetrically in above-mentioned 2 directions, and a plurality of light beam L1, L2, L3, the L4 that are rotated deflector 62 deflection scannings lead being scanned on the face of each self-corresponding photosensitive drums 1,2,3,4 and the scanning optics of the optical system mechanism of imaging (scanning lens 63,64,69,70,71,72 shown in Fig. 8 and Fig. 9, light path shown in Figure 8 turn back usefulness mirror 65,66,67,68 etc.), these component parts folding and unfoldings are in the optical housing 550 as single housing with this rotation deflector 62.More particularly, 4 light source cells 52,53,54,55 are arranged on the sidewall of optical housing 550, rotation deflector 62 is configured in the roughly pars intermedia of the base (opening the base shown in Figure 4 (5) of 2002-196269 communique with reference to above-mentioned spy) of optical housing 550, scanning optics the upper face side of above-mentioned base and below the side separate configuration.
Also have, remove light path shown in Figure 8 and turn back with the mirror 65,66,67,68, this mirror also is configured on the position of regulation, and it is detailed in identical omission the shown in Figure 4 of opening the 2002-196269 communique with above-mentioned spy.Also have, in Fig. 8, the catoptron that symbol 60,61 expressions are only worked to light beam L1, L4.
In Fig. 9, the light scanning apparatus of aftermentioned one embodiment of the present invention has been used in parenthesized symbol 5 expressions, the optical housing of parenthesized symbol 50 these embodiments of expression.
In this light scanning apparatus 500, become the color separated image data conversion of never illustrated original document reading apparatus (scanner) or image-data output device (acceptance divisions such as PC, word processor, facsimile recorder) input light source to drive and use signal, drive each light source cell 52,53,54,55 interior light source (semiconductor laser (LD)) according to this and outgoing beam L1, L2, L3, L4.Cylindrical lens 56,57,58,59, the catoptron 60,61 (only relevant with light beam L1, L2 here) of toppling over (face fall れ) compensation usefulness by face from light beam L1, the L2 of each light source cell 52,53,54,55 outgoing, L3, L4 arrive rotation deflector 62, and 2 sections polygonal mirror 62a, the 62b that rotates in order to multiaspect motor 62c constant speed is at 2 direction deflection scannings of symmetry.
Be rotated the polygonal mirror 62a of deflector 62,62b is at the light beam L1 of 2 direction deflection scannings of per 2 light beams, L2, L3, L4 is the scanning lens 63 by for example being made of the f θ lens of 2 layers of structure up and down etc. respectively, 64, by the 1st mirror 65 of turning back, 66,67,68 turn back and by behind the peristome of above-mentioned base, by the 2nd imaging that for example constitutes by long lens ring etc. with lens 69,70,71,72, Jie (opens the shown in Figure 4 the 2nd of the 2002-196269 communique mirror (73 of turning back with reference to above-mentioned spy by the 2nd mirror of turning back, 75,77,79)), the 3rd mirror of turning back (is opened the shown in Figure 4 the 3rd of the 2002-196269 communique mirror (74 of turning back with reference to above-mentioned spy, 76,78,80)), each not shown dustproof glass and shine of all kinds with photosensitive drums 1,2,3,4 by on the photoscanning face, write the formation electrostatic latent image.
In light scanning apparatus 500,4 light source cells 52,53,54,55 are by constituting as the semiconductor laser (LD) of light source with to the collimation lens that the outgoing beam of this semiconductor laser collimates, and they are gone into the formation of support by the one group.On the light path of each light beam L1, L2, L3, L4, be provided with the not shown synchronizing detection mirror of the light beam of the scanning starting position that is used to take out main scanning direction, by synchronizing detection with the light beam of mirror reflection by with the paragraph numbering " 0025 " of opening the 2002-196269 communique above-mentioned spy in the synchronizing signal that same synchroprobe (81,82) receives and output scanning begins put down in writing.In addition, on the light path of the light beam of L1, L2, L3, dispose the 3rd turn back be provided with on the mirror with above-mentioned paragraph numbering " 0025 " in the step motor (92,93,94) of the same deflection adjustment usefulness put down in writing, scan line position with light beam L4 is a benchmark, and departing from of scan line position of the light beam of L1, L2, L3 compensated.
Be rotated light beam L1, the L2 of deflector 62 deflection scannings, the direction of scanning of L3, L4 is a main scanning direction, this also be each photosensitive drums 1,2,3,4 axially.With the direction of this main scanning direction quadrature be sub scanning direction, this also is the sense of rotation (moving direction of photosensitive drum surface) of each photosensitive drums 1,2,3,4, and also is the carrying direction of duplicating carry strap 22a.That is, the Width that duplicates carry strap 22a is that main scanning direction, carrying direction are sub scanning directions.
As shown in Figure 9, below 4 photosensitive drums 1,2,3,4 that are set up in parallel, be equipped with to be erected at and duplicate carry strap 22a on driven roller and a plurality of driven voller, utilize driven roller carrying of the direction shown in the arrow in this figure.Be equipped with a plurality of sheet feed sections 23,24 of the duplicating material of folding and unfolding paper used for recording etc. in the lower body part of image processing system, the duplicating material of folding and unfolding is given and is duplicated carry strap 22a by paper feed roller, carrying roller, aligning dancer rools 25 in these sheet feed sections 23,24, puts carrying by duplicating carry strap 22a.
Each sub-image that is formed on each photosensitive drums 1,2,3,4 by light scanning apparatus 500 is with the toner development of all kinds of Y, the M of each developing apparatus 10,11,12,13, C, Bk and video pictureization, make by each reproducing unit 14,15,16,17 that duplicates Handling device 22 this video pictureization Y, M, C, Bk toner image of all kinds successively with duplicate carry strap 22a on the duplicating material that puts overlap and duplicate.Then, the duplicating material that has duplicated the image of 4 kinds of colors is moved on the fixing device 26 as fixing mechanism, after 26 pairs of image fixing of fixing device, utilizes exit roller 27 to be discharged on the discharge tray 28.
Yet, with as shown in Figure 8 rotation deflector 62 is that scanning lens 63,64 and the light path that the center balanced configuration constitutes optical system mechanism turned back with mirror 65～68, when 4 light beam L1, L2, L3, L4 being divided into the formation of 2 light beams ground deflection scannings in 2 directions of symmetry, become problem from the dazzle meeting of the optical system of mutual subtend with single rotation deflector 62.For example, be reflected or during scattering at the plane of incidence side beam of the scanning lens 63,64 that accompanies rotation deflector 62 mutual subtends, the light of this reflection or scattering (dazzle) advances to opposite direction, enter the optical system of opposing side, thereby have this dazzle that enters by the problem of irradiation optical system to each image carrier (each photosensitive drums 1,2,3,4) and so on.And, when dazzle shines image carrier, on the image corresponding, produce the spot or the ghost of striated with it, become the reason that makes the image quality deterioration.
To this, as shown in Figure 1 to Figure 3, light scanning apparatus 5 of an embodiment of this enforcement and invention have been carried out with image processing system of this light scanning apparatus.To the embodiment shown in Figure 3, difference only is with regard to Fig. 1: be not with Fig. 8 and light scanning apparatus 500 shown in Figure 9 but with being with bracket to distinguish the light scanning apparatus of representing 5 among two figure and not being with image processing system shown in Figure 9 but with possessing the image processing system of distinguishing the light scanning apparatus of representing 5 in the figure with bracket.
That is, light scanning apparatus 5 is following a kind of device, possesses: as 4 light source cells 52,53,54,55 of a plurality of light source mechanism; As will separate the single rotation deflector 62 of the deflection mechanism that deflection scans in 2 directions of symmetry from light beam L1, the L2 of each light source cell 52,53,54,55, L3, L4; And as the light beam L1 that will rotate deflector 62 scannings, L2, L3, L4 each self-corresponding photosensitive drums 1 that leads, 2,3, the come up scanning optics (scanning lens 63 shown in Figure 1 of optical system mechanism of imaging of 4 the face that is scanned, 64, light path shown in Figure 3 is turned back with mirror 65,66 etc.), be line with respect to the center line that rotates deflector 62 above-below directions and dispose each scanning optics symmetrically, and in optical housing 50, possesses each light source cell 52 as single housing mechanism, 53,54,55, rotation deflector 62 and each scanning optics, rotation deflector 62 is configured in the inboard of the retractable room 51 shown in Fig. 1 shade that is formed in the optical housing 50, is provided with in optical housing 50 as preventing by the light beam of rotation deflector 62 deflection scannings by a pair of light-blocking member 35 of the chopping mechanism of the scanning optics reflection of subtend one side separately or scattering, 36.
Light-blocking member 35,36 be configured in as from each light source cell 52,55 to the rotation deflector 62 incident beam light beam L2, L3 and from the rotation deflector 62 between the light beam of scanning optics deflection scanning.Like this by configuration light-blocking member 35,36, it is disposed further with respect to rotation deflector 62, and owing to the same effect of prior art that has obtained illustrating with reference Fig. 8, thereby can reduce the antitriptic wind sound that causes of rotation of rotation deflector 62, and can prevent the growth of the antitriptic wind sound that light-blocking member 35,36 (chopping mechanism) causes.
In addition, rotation deflector 62 is characterised in that, is configured in the inboard of the retractable room 51 shown in Fig. 1 shade that is formed in the optical housing 50, and these light-blocking members 35,36 is configured in the outside of retractable room 51.
Each light-blocking member 35,36 be clipped between the scanning lens 63,64 about the center line of the above-below direction of rotation deflector 62 almost symmetry the position each be configured at a place.In the present embodiment, each light-blocking member 35,36 utilizes above-mentioned resin and retractable room 51 one-body molded with optical housing 50 together.In addition, be provided with the opening 51c that light beam passes through in the part of the retractable room 51 of optical housing 50.
In addition, the inwall 51a of retractable room 51 and outer wall 51b double as prevent that above-mentioned each scanning optics from causing with respect to the optical axis center of above-mentioned each scanning optics to the reflection that does not have light source cell 52,53,54,55 1 sides or the light-blocking member of scattered light.
Also have, if so do not wish above-mentioned effect and aftermentioned advantage, each light-blocking member 35,36 is not one-body molded with optical housing 50 together with retractable room 51, but for example be used to prevent reflect or the other parts of scattered light form, for example with fixed mechanism such as screw or bonding agent or double sticky tape etc. are fixing also can.In addition, the surface treatment of each light-blocking member 35,36 or material shape etc. are not limited to absorb dazzle, cause the degree of problem just passable so long as dazzle decayed to not produce by dazzle.
In general, owing to rotate deflector 62 with very high speed rotation, thus the caused noise of antitriptic wind sound that this rotation produces becomes problem.With regard to present embodiment, also same with the light-blocking member (89,90) of prior art shown in Figure 8, possess the light-blocking member 35,36 that is used to prevent dazzle as mentioned above, this light-blocking member 35,36 is configured to be positioned at the outside that the retractable room 51 of deflector 62 is rotated in folding and unfolding.
Also have, for the simplification of figure, light-blocking member 35,36 shown in Figure 1 illustrates turgidly than a little amplification shown in Figure 6.In Fig. 2 and Fig. 3 because light-blocking member 35,36 is configured in the rear side of optical housing 50, so from positive (above) side cannot see (with reference to the upward view of Fig. 6 of expression aftermentioned modified example 2 and the longitudinal section of Fig. 7).
By such configuration light-blocking member 35,36, the rotation of rotation the deflector 62 and antitriptic wind sound that produces only produces retractable room 51 in utilizes the outer wall of this retractable room 61 to block antitriptic wind sound, thereby can not make the antitriptic wind sound increase because of each light-blocking member 35,36.That is to say, owing to can not cause the increase of the antitriptic wind sound that the rotation of rotation deflector 62 causes, thus compared with prior art, can further reduce noise.
In the side that light source cell 52,53,54,55 is arranged, each is configured at a place each light-blocking member 35,36 symmetrically with respect to rotation deflector 62 with respect to the optical axis center of above-mentioned scanning optics.Therefore, in Fig. 1, the light beam that is rotated deflector 62 deflection scannings is directly reflected from the plane of incidence of scanning lens 63,64, produces dazzle.
In the plane of incidence beam reflected by scanning lens 63,64, have the light beam Fa of light source cell 52,53,54,55 1 lateral reflections to be stoped by light-blocking member 35 in scanning lens 63 side direction, but because the gap that between light-blocking member 35 and rotation deflector 62, exists light beam to enter, thereby can not prevent dazzle fully.Yet, with regard to present embodiment, on position with respect to the symmetry that rolls off the production line on by rotation deflector 62 centers, each disposes light-blocking member 35,36 on ground, a place in that light source one side is arranged, thereby the light-blocking member 36 that the dazzle Fb of the gap incident between the deflector 62 can enough subtends from light-blocking member 35,36 and rotation stops, and has therefore more positively prevented dazzle.Certainly, by such balanced configuration light-blocking member 35,36, can both obtain same advantageous effect for the scanning optics that with rotation deflector 62 is any side about the center.
In addition,, thereby can not cause the increase of part count, cheap light scanning apparatus 5 can be provided because light-blocking member 35,36 and optical housing 50 are one-body molded.
In addition, the inwall 51a of the retractable room 51 of simultaneously integrated on optical housing 50, folding and unfolding rotation deflector 62 and outer wall 51b are double does with respect to the optical axis center of the scanning optics light-blocking member to the dazzle that does not have light source one side.That is, by the plane of incidence of scanning lens 63,64 directly in the dazzle of reflection, enter inwall 51a and the 51b that the dazzle Fc, the Fd that do not dispose light source one side be rotated the retractable room 51 of deflector 62 and stop.As a result, can be really in the whole zone of the effective scanning scope of scanning optics and prevent dazzle with the formation of cheapness.
Have again, because it is resinous constituting the optical housing 50 of light scanning apparatus 5, thereby can further reduce cost, can not looking like as shown in Figure 2 simultaneously, the mould formation becomes complicated, the part that promptly is equivalent to the shading wall of light-blocking member 35,36 can not become undercutting or cut-out, thereby reduces cost.
In addition, since with light-blocking member 35,36 and retractable room 51 in optical housing 50 fusion for example carbon black etc. finish the advantageous effect that certain reduction absorbs dazzle as the pigment that absorbs the dazzle that scanning optics causes the most at an easy rate thereby can access with the simplest formation.
The feature of shape also is around the retractable room 51: light-blocking member 35,36 be configured in as from each light source cell 52,55 to light beam L2, the L3 of the incident beam of rotation deflector 62 and as from rotation deflector 62 between the light beam of the deflection scanning of scanning optics, simultaneously light-blocking member 35,36 is configured in the outside of retractable room 51, in subtend sweep type scanister, become the sort of elliptical shape shown in Figure 1 or the sort of rhombus shown in Figure 4 (coffin) shape thus.At this moment, when retractable room 51 is formed with ellipse, become complicated owing to be used for the mold structure of resin forming, thereby consider to be suitable for adopting favourable prismatic from the angle of mold structure.
In addition, the inwall 51a face that folding and unfolding is rotated the retractable room 51 of deflector 62 is made to traverse does not have the circle of angle (rib) (or circular arc) full week, forms for example circle about R2～R5.Like this, can further improve the screening audio fruit of the antitriptic wind sound that the rotation of rotating deflector 62 is caused.
Modified example 1
Shown in Figure 4 is the modified example of the embodiment of Fig. 1 to Fig. 3.
Modified example 1 is compared difference with the light scanning apparatus 5 of above-mentioned embodiment and only is: each the opening 51c at the retractable room 51 of the effective scanning scope of the light beam of rotation deflector 62 deflection scannings is provided as the soundproof glass 79 that the transmittance with transmitance and sound isolation property hides the line part, and formation in addition is identical with light scanning apparatus of above-mentioned embodiment 5 and image processing system.
According to modified example 1, except that the advantageous effect of above-mentioned embodiment, hide the audio fruit by in effective scanning scope, pasting soundproof glass 79 sheet glass for example that hides the line part as transmittance, can further improving with respect to the retractable room 51 reflection light beams deflected of rotation deflector 62.
Modified example 2
Fig. 5 to shown in Figure 7 be the modified example 2 of modified example 1 shown in Figure 4.
Modified example 2 is compared difference with modified example 1 and only is: be provided with the cover 78 as the cover of the retractable room at least 51 of airtight optical housing 50, formation in addition is identical with the light scanning apparatus 5 and the image processing system of modified example 1.Fixed mechanisms such as cover 78 usefulness screws are fixed on the optical housing 50.
According to modified example 2, except that the advantageous effect of the embodiment of modified example 1,, hide the audio fruit thereby can further improve effectively owing to utilize the retractable room 51 that cover 78 can airtight rotation deflector 62.
In addition, if form cover 78 with the metal parts of metallic, for example iron plate or aluminium sheet etc., the temperature in the retractable room 51 that also can suppress to produce because of rotation deflector 62 rises.
Modified example 3
Shown in Figure 10 is the modified example 3 of the modified example 2 of Fig. 5 to Fig. 7.
Modified example 3 is compared the main difference point and is with modified example 2: the case cover 80 that covers optical housing 50 integral body is loaded and unloaded the metal cover 78A that is arranged on the optical housing 50 freely and is provided as the cap assembly of airtight retractable room 51 with respect to case cover 80 in addition.
For example polycarbonate resin resins such as (PC) is one-body molded for case cover 80 and optical housing 50 same usefulness.Cover 78A forms with laminal metal parts such as for example iron plate or aluminium sheet etc.The cover 78A by case cover 80 usefulness for example screw 81 fixed mechanisms such as grade be fixed on the optical housing 50.
According to modified example 3, except that the advantageous effect of the embodiment of modified example 1 because retractable room 51 that can the airtight rotation deflector 62 of enough metallic cover 78A, thus can improve hide the audio fruit in, further improve radiating effect effectively.
As described above, if adopt the words of above-mentioned embodiment, modified example 1 to 3, then by making the image processing system that possesses light scanning apparatus 5, can access and constitute the image processing system simple, that cost is lower, can positively eliminate the decline of the image quality of stripe pattern that dazzle causes or ghost simultaneously.
As mentioned above, specific embodiment, modified example that just comprises embodiment etc. describes the present invention, but those skilled in the art as can be known: the scope of technology disclosed by the invention is not limited to each modified example of the respective embodiments described above and example etc., can constitute by suitably making up them, within the scope of the invention, according to its necessity and purposes etc., can constitute various embodiments and modified example or embodiment.
Claims (11)
1. light scanning apparatus, possess a plurality of light source mechanism, the single deflection mechanism that will scan and with each self-corresponding is scanned on the face of the beam direction of scanning and the optical system mechanism of imaging from each beam deflection of this a plurality of light source mechanism, it is characterized in that
In single casing mechanism, possess above-mentioned a plurality of light source mechanism, above-mentioned deflection mechanism and above-mentioned optical system mechanism,
In above-mentioned casing mechanism, be respectively equipped with and prevent by the light beam of above-mentioned deflection mechanism deflection scanning by the above-mentioned optical system mechanism's reflection of subtend or the light-blocking member of scattering separately with respect to above-mentioned optical system mechanism,
The center line of the above-below direction of above-mentioned relatively deflection mechanism disposes above-mentioned optical system mechanism symmetrically,
A plurality of above-mentioned light source mechanism is configured on the sidewall of above-mentioned housing,
Above-mentioned light-blocking member is to be clipped in the mode between each scanning lens in the above-mentioned optical system mechanism and to be almost the position of symmetry and to have above-mentioned light source mechanism one side respectively to dispose one at the optical axis center of above-mentioned relatively optical system mechanism at the center line of the above-below direction of above-mentioned relatively deflection mechanism
Above-mentioned light-blocking member be configured in from each above-mentioned light source mechanism upwards state the incident beam of deflection mechanism incident and from above-mentioned deflection mechanism between the light beam of above-mentioned optical system deflection scanning.
2. light scanning apparatus according to claim 1 is characterized in that,
Above-mentioned deflection mechanism is disposed at the inboard of the retractable room that forms in above-mentioned casing mechanism,
Above-mentioned light-blocking member is configured in the outside of above-mentioned retractable room.
3. light scanning apparatus according to claim 2 is characterized in that,
Above-mentioned light-blocking member and above-mentioned retractable room are one-body molded with above-mentioned casing mechanism together.
4. light scanning apparatus according to claim 3 is characterized in that,
The inwall of above-mentioned retractable room and outer wall be double do prevent above-mentioned optical system mechanism with respect to the optical axis center of above-mentioned optical system mechanism to the reflection that does not have above-mentioned a plurality of light source mechanism one side to produce or the light-blocking member of scattered light.
5. light scanning apparatus according to claim 2 is characterized in that,
The transmittance that is provided with transmitance and sound isolation property in the above-mentioned retractable room by the effective scanning scope of the light beam of above-mentioned deflection mechanism deflection scanning hides the line part.
6. light scanning apparatus according to claim 1 is characterized in that,
Above-mentioned casing mechanism forms with resin.
7. light scanning apparatus according to claim 6 is characterized in that,
Fusion absorbs the reflection that above-mentioned optical system mechanism causes or the pigment of scattered light in above-mentioned resin.
8. light scanning apparatus according to claim 2 is characterized in that,
On the internal face of above-mentioned retractable room, form the circle that does not have the angle in its full week.
9. light scanning apparatus according to claim 2 is characterized in that,
Above-mentioned at least retractable room with the airtight above-mentioned casing mechanism of cover.
10. light scanning apparatus according to claim 9 is characterized in that,
Above-mentioned cover is metal.
11. an image processing system is characterized in that,
Have the described light scanning apparatus of claim 1 and possess the above-mentioned a plurality of image carriers that are scanned face.
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| JP2004363456 | 2004-12-15 | ||
| JP2004363456 | 2004-12-15 | ||
| JP2005307599 | 2005-10-21 |
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| CN100447613C true CN100447613C (en) | 2008-12-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5116273B2 (en) | 2006-09-19 | 2013-01-09 | 株式会社リコー | Optical scanning device, light shielding material, flare light shielding method, and image forming apparatus |
| JP4592791B2 (en) * | 2008-09-08 | 2010-12-08 | シャープ株式会社 | Optical scanning apparatus and image forming apparatus |
| JP5150568B2 (en) * | 2009-06-29 | 2013-02-20 | 京セラドキュメントソリューションズ株式会社 | Optical scanning apparatus and image forming apparatus having the same |
| JP5024336B2 (en) * | 2009-07-24 | 2012-09-12 | ブラザー工業株式会社 | Optical scanning device |
| JP6882001B2 (en) * | 2017-02-15 | 2021-06-02 | キヤノン株式会社 | Optical scanning device and image forming device |
| JP7163664B2 (en) * | 2018-08-17 | 2022-11-01 | 京セラドキュメントソリューションズ株式会社 | Optical deflection device, optical scanning device provided with optical deflection device, and image forming apparatus provided with optical scanning device |
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