CN100557476C - Optical writing device and image processing system - Google Patents
Optical writing device and image processing system Download PDFInfo
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- CN100557476C CN100557476C CNB2006101714112A CN200610171411A CN100557476C CN 100557476 C CN100557476 C CN 100557476C CN B2006101714112 A CNB2006101714112 A CN B2006101714112A CN 200610171411 A CN200610171411 A CN 200610171411A CN 100557476 C CN100557476 C CN 100557476C
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Abstract
The invention provides a kind of optical writing device and device for image forming that can fully suppress temperature rising in the optical writing device.Optical writing device of the present invention lower cover (130) with as the bearing portion of heat generating part, the bearing bridge (158a) that generates heat when driving polygon-mirror motor relative to the position be provided with hole (130a), so energy will directly be emitted to the outside in the heat of the bearing portion generation hole (130a) by lower cover.Thus, can efficiently the heat of polygon-mirror motor bearing portion be emitted.Therefore, can suppress the rising of temperature in the optical writing device fully, suppress the thermal deformation of optical system components.
Description
Technical field
The present invention relates to a kind of feasible optical writing device and image processing system that light inlet scans in the enterprising horizontal deflection of sub-image mounting body of writing according to image information
Background technology
In device for image forming such as duplicating machine, printer, facsimile recorder, irradiation in the enterprising horizontal deflection scanning of sub-image mounting body, forms sub-image according to the light inlet of writing of image information on sub-image mounting body, to this sub-image acquisition image that develops.To write the optical writing device (light scanning apparatus) that light inlet carries out deflection scanning, generally have make from light source portion write light inlet carry out deflection scanning, as the polygonal mirror of polygonal rotating mirror, drive the rotating polygon-mirror motor of polygonal mirror, make and utilize this polygonal mirror to carry out the optical system components of writing the light inlet imaging len that imaging is used on sub-image mounting surface etc. etc. of deflection scanning.And these component parts are incorporated in the housing, with lid member etc. housing is covered airtight so that on the unlikely optical system components of dust and rubbish attached to imaging len etc.
In above-mentioned polygon-mirror motor, the catoptron rotor that the cup-shaped of polygonal mirror is installed is fixed in the rotating shaft, and its rotating shaft rotation remains on bearing portion freely.On the inner peripheral surface of catoptron rotor, rotor magnet is installed, relative with this rotor magnet to the position, disposing by the iron core member and be wound on the stator that the coil member on this iron core member constitutes.This stator is fixed on bearing portion.Circuit substrate is being fixed by bearing portion at polygon-mirror motor, and its lift-launch is used for the electronic control component that this polygon-mirror motor of drive controlling is used.
Making that when writing light inlet deflection, this polygon-mirror motor is with 30000[rpm] above high speed is rotated, so the bearing portion of polygon-mirror motor generates heat.When driving polygon-mirror motor, the electronic control component on the circuit substrate also generates heat.
Optical writing device is because airtight with cover component, so the heat that takes place in the heat generating part (bearing portion and electronic control component) of described polygon-mirror motor is just shrouded in optical writing device inside the internal temperature rising.If become high temperature in the optical writing device, might make the optical system components generation thermal deformation of imaging len etc.When optical system components generation thermal deformation, then might make and write light inlet and can't image on the sub-image mounting surface.In coloured image building mortion occasion, the irradiation position to each sub-image mounting surface can be offset, and produces color shift.
Open the Jap.P. spy and to have put down in writing following such optical writing device in the 2005-250190 communique (following brief note for " patent documentation 1 "): its cover component constitutes with the high member of thermal conductivity, and polygon-mirror motor is directly installed on this cover component.The heat that takes place from the heat generating part (bearing portion and electronic control component) of polygon-mirror motor conducts to cover component, and emits from the outside of cover component to optical writing device.Owing to emit to the outside from the heat of polygon-mirror motor heat generating part,, can suppress the thermal deformation of optical system components so the temperature that can suppress in the optical writing device rises.
Yet, from the heat of the lid member of the heat generating part of polygon-mirror motor conduction also to the optical writing device internal radiation.Thus, by this lid member heating optical writing device inside, the temperature that can not suppress fully in the optical writing device rises.
Summary of the invention
The present invention puts forward for solving the existing problem of above-mentioned prior art, and its purpose is, provides a kind of and can fully suppress optical writing device and the image processing system that temperature rises in the optical writing device.
In order to achieve the above object, the present invention proposes following technical scheme.
(1) a kind of optical writing device, in its housing, taken in:
Luminous light source portion;
The revolution polygonal mirror makes the light that described light source portion takes place carry out deflection scanning for sub-image mounting surface along main scanning direction;
Polygon-mirror motor drives described revolution polygonal mirror revolution;
Imaging len is used for making and carries out light imaging on sub-image mounting surface of deflection scanning by this revolution polygonal mirror;
Cover the open portion of this housing with the lid member, it is characterized in that:
The heat generating part of generating heat when driving this polygon-mirror motor of this lid member relative to the position hole is set.
(2) in (1) described optical writing device, it is characterized in that:
The sectional area with connecting the direction orthogonal directions of above-mentioned lid component hole is made as is less than or equal to above-mentioned polygon-mirror motor heat generating part and sectional area lid member subtend face.
(3) in (1) described optical writing device, it is characterized in that:
The part of the heat generating part of above-mentioned polygon-mirror motor is inserted in the hole of above-mentioned lid member.
(4) in (3) described optical writing device, it is characterized in that:
Form the hole of this lid member, making becomes very little gap between the hole inner peripheral surface of the heat generating part of above-mentioned polygon-mirror motor and above-mentioned lid member.
(5) in (4) described optical writing device, it is characterized in that:
The part of above-mentioned polygon-mirror motor heat generating part being inserted the hole of above-mentioned lid member forms otch.
(6) in (3) described optical writing device, it is characterized in that:
The heat generating part of above-mentioned polygon-mirror motor is to rotate the bearing portion of supporting this polygon-mirror motor revolving shaft freely, on above-mentioned housing, be provided with boss portion, this boss portion has the tubular through hole, the part of described bearing portion is inserted in this through hole, form the hole of covering member, described bearing portion inserts in the hole of above-mentioned lid member with boss portion, and making becomes very little gap between the inner peripheral surface in hole of this boss portion and lid member.
(7) in (6) described optical writing device, it is characterized in that:
Part at the patchhole of above-mentioned boss portion forms otch.
(8) in (6) or (7) described optical writing device, it is characterized in that:
The wall portion that surrounds above-mentioned boss portion is set on above-mentioned housing.
(9) in (8) described optical writing device, it is characterized in that:
Above-mentioned wall portion does circlewise.
(10) in (8) or (9) described optical writing device, it is characterized in that:
The hole of above-mentioned lid member is outstanding to the inside, sets the height of this wall portion, makes the part of this hole outer peripheral face and the local subtend of above-mentioned wall portion.
(11) in (3)-(10), in any described optical writing device, it is characterized in that:
The hole of above-mentioned lid member makes cylindric, and the length of this cylinder is greater than the wall thickness of this lid member.
(12) in (1)-(11), in any described optical writing device, it is characterized in that:
Radiating component is installed in the hole of above-mentioned lid member.
(13) in (1)-(12), in any described optical writing device, it is characterized in that:
The hole of above-mentioned lid member is arranged on the top of above-mentioned polygon-mirror motor heat generating part.
(14) in (1)-(12), in any described optical writing device, it is characterized in that:
Above-mentioned lid member is configured in the below of above-mentioned housing.
(15) a kind of image processing system is characterized in that:
Be provided with as any described optical writing device in (1)-(14).
According to optical writing device of the present invention and image processing system, the heat generating part of generating heat when driving polygon-mirror motor of lid member relative to the position be provided with the hole, so can directly emit by the hole of covering member in the heat that heat generating part takes place to the outside.Therefore, and indirectly the heat of the heat generating part of polygon-mirror motor is emitted occasion by the lid member and compare, can be efficiently the heat of the heat generating part of polygon-mirror motor be emitted to the outside.Thus, the temperature that can suppress fully in the optical writing device rises, and can suppress the thermal deformation of optical system components.
Description of drawings
Fig. 1 is the summary pie graph of expression printer.
Fig. 2 is the summary pie graph of the imaging station of this printer of expression.
Fig. 3 constitutes key diagram from the axial light writing unit of looking of photoreceptor.
Fig. 4 is the formation key diagram from following this light writing unit of looking.
Fig. 5 is the formation key diagram from top this light writing unit of looking.
Fig. 6 is a polygon-mirror motor summary pie graph.
Fig. 7 is the amplification pie graph of the polygon-mirror motor installation portion periphery of this light writing unit.
Fig. 8 is air intake and exhaust system figure in this printer.
Fig. 9 is the 1st variation of this light writing unit.
Figure 10 is the bearing bridge of the 1st variation and the size relationship figure of lower cover hole portion.
Figure 11 is the 2nd variation of this light writing unit.
Figure 12 is the boss portion of the 2nd variation and the size relationship figure of lower cover hole portion.
Figure 13 is the 3rd variation of this light writing unit.
Figure 14 is the boss portion of the 3rd variation and the size relationship figure of lower cover hole portion.
Figure 15 is the 4th variation of this light writing unit.
Figure 16 is the stereographic map of the 5th variation of this light writing unit.
Figure 17 is another configuration example of the 5th variation.
Figure 18 is the partial sectional view of the 5th variation.
Embodiment
Describe the printer that the embodiment of the invention relates to reference to the accompanying drawings in detail as device for image forming.In following examples, though to inscape, kind, combination, shape, configuration waits and has done various qualifications relatively,, these only exemplify, and the present invention is not limited thereto.
Present embodiment is that example describes with the tandem type device for image forming of so-called intermediate transfer mode, but the invention is not restricted to this.
Fig. 1 is the summary pie graph of the printer that relates to of present embodiment.
The paper feeding cassette 2 that this printer is provided with device body 1 and can pulls out from this device body 1.Central portion at device body 1 has formation yellow (Y), blue or green (C), pinkish red (M), deceives imaging station 3Y, 3C, 3M, 3K that (K) toner of all kinds looks like to use.Below, the apposition word Y of each symbol, C, M, K represent the member of Huang, green grass or young crops, magenta, black usefulness respectively.
Fig. 2 is the summary pie graph of the imaging station of expression yellow (Y).Other imaging station also are same spline structures.
As depicted in figs. 1 and 2, drum type photoreceptor 10Y, 10C, 10M, the 10K as sub-image mounting body of the rotation of arrow A direction in imaging station 3Y, 3C, 3M, the 3K tool digraph.Photoreceptor 10Y, 10C, 10M, 10K by the cylindrical substrate of aluminum and cover its surface, for example OPC (organic photosemiconductor) photographic layer constitutes.Each imaging station 3Y, 3C, 3M, 3K have around photoreceptor 10Y, 10C, 10M, 10K respectively: make photoreceptor charged charging device 11Y, 11C, 11M, 11K, make that formed sub-image develops on photoreceptor, as developing apparatus 12Y, 12C, 12M, the 12K of development means, cleaning device 13Y, 13C, 13M, 13K that toner residual on photoreceptor is cleaned.Below each imaging station 3Y, 3C, 3M, 3K, have and to write the light writing unit 4 that light inlet L shines the means that write on photoreceptor 10Y, 10C, 10M, 10K, as the light of light scanning apparatus.Have intermediate transfer unit 5 above each imaging station 3Y, 3C, 3M, 3K, this intermediate transfer unit 5 has the intermediate transfer belt 20 that carries out transfer printing with by each imaging station 3Y, 3C, the formed toner image of 3M, 3K.Again with transfer printing on the toner on the intermediate transfer belt 20 looks like to be transferred to transfer paper P as the record material.Also be provided with fixation unit 6, the toner on the transfer paper P is looked like to carry out photographic fixing.And, toner bottle 7Y, 7C, 7M, the 7K that is taking in yellow (Y), blue or green (C), pinkish red (M), black (K) toner of all kinds is housed on the top of device body 1.By opening the row's paper disc 8 that is formed on device body 1 top, described toner bottle 7Y, 7C, 7M, 7K device body 1 loading and unloading relatively.
Above-mentioned smooth writing unit 4 utilizes the polygonal mirror as deflection scanning portion, will carry out deflection scanning from the light inlet L that writes that launches as the laser diode of light source portion, by being radiated on photoreceptor 10Y, 10C, 10M, the 10K, forms sub-image on each photoreceptor.The detailed description of light writing unit 4 is described in the back.
The intermediate transfer belt 20 of above-mentioned intermediate transfer unit 5 is erected on driven roller 21, jockey pulley 22 and the driven voller 23, counterclockwise is driven revolution fix time in figure.Intermediate transfer unit 5 has and will be formed at toner on photoreceptor 10Y, 10C, 10M, the 10K as primary transfer roller 24Y, 24C, 24M, the 24K of transfer printing on intermediate transfer belt 20.Intermediate transfer unit 5 also has: transfer printing is looked like to be transferred to secondary transfer roller 25 on the transfer paper P at the toner on the intermediate transfer belt 20; The band cleaning device 26 that the residual toner of transfer printing on the intermediate transfer belt 20 that is not needed on the transfer paper P is cleaned.
Below, the operation that obtains coloured image in the printer of above-mentioned formation is described.
At first, on imaging station 3Y, 3C, 3M, 3K, photoreceptor 10Y, 10C, 10M, 10K by charging device 11Y, 11C, 11M, 11K by uniform charged.Then,, make the light inlet L that writes carry out deflection scanning, on the surface of photoreceptor 10Y, 10C, 10M, 10K, form sub-image based on image information by light writing unit 4.Sub-image on photoreceptor 10Y, 10C, 10M, the 10K is developed by the toner of all kinds on the developer roll 15Y, the 15C that are positioned in developing apparatus 12Y, 12C, 12M, 12K, 15M, the 15K, forms the toner picture.Toner picture on photoreceptor 10Y, 10C, 10M, the 10K is by the effect of each primary transfer roller 24Y, 24C, 24M, 24K, and quilt superimposed transfer printing successively is being driven on the rotating intermediate transfer belt 20 towards being rotated counterclockwise direction.At this moment, imaging of all kinds action, along the moving direction of intermediate transfer belt 20, from upstream side side downstream, the time of staggering carries out, so that its toner is as the same position of superimposed transfer printing on intermediate transfer belt 20.Photoreceptor 10Y, 10C, 10M, 10K after primary transfer finishes are cleaned its surface by the cleaning doctor 13a of cleaning device 13Y, 13C, 13M, 13K, use for forming image next time.The toner that is filled among toner bottle 7Y, 7C, 7M, the 7K passes through not shown transmission path as required, and is quantitative to developing apparatus 12Y, 12C, 12M, the 12K supply institute of each imaging station 3Y, 3C, 3M, 3K.
On the other hand, the transfer paper P in the above-mentioned paper feeding cassette 2 utilize near the paper feed rollers 27 that are provided in the paper feeding cassette 2 to be transferred in the device body 1, by registration roller to 28 fix time and be sent to secondary transfer printing portion.Then, in secondary transfer printing portion, be formed at toner on the intermediate transfer belt 20 as transfer printing on transfer paper P.Transfer printing has the transfer paper P of toner picture by fixation unit 6, carries out image fixing, is discharged to row's paper disc 8 by distributing roller 29.As photoreceptor 10Y, 10C, 10M, 10K, the residual toner of transfer printing that remains on the intermediate transfer belt 20 is cleaned by the band cleaning device 26 that contacts with intermediate transfer belt 20.
Below, the structure of above-mentioned smooth writing unit 4 is described.
Fig. 3 constitutes key diagrams from the axial light writing unit of looking of photoreceptor 4, Fig. 4 be A from Fig. 3 to the formation key diagram of seeing light writing unit 4, Fig. 5 is that B from Fig. 3 is to the formation key diagram of seeing light writing unit 4.
This light writing unit 4 is made of following component parts.That is, have: as light source cell 70K, 70M, 70C, the 70Y of light source portion, emission is corresponding with each photoreceptor 10K, 10M, 10C, 10Y respectively writes light inlet Lk, Lm, Lc, Ly; Cylindrical lens 60K, 60M, 60C, 60Y are used for carrying out revisal from the face of writing light inlet of this light source cell 70K, 70M, 70C, 70Y emission is crooked.Also have polygon-mirror motor 150 as component parts, it is provided with polygonal mirror 41a, the 41b of the conduct revolution polygonal mirror that is made of positive polygonal column shape.This polygonal mirror 41a, 41b have catoptron in its side, utilize polygon-mirror motor 150 described later, with the central shaft of positive polygonal column as rotation center with 32000[rpm] the rotating speed revolution.The component parts of light writing unit 4 also has: will carry out the sound control glass 42 as shading member that sound insulation is used from the sound that polygon-mirror motor 150 takes place; The equal angles motion converter of the photoscanning that will be caused by polygonal mirror 41a, 41b becomes uniform rectilinear motion's f θ lens 43a, 43b; 1st catoptron 44a, 44b, 44c, the 44d of photoconduction to photoreceptor 10Y, 10C, 10M, 10K will be write; The 2nd catoptron 46a, 46b, 46c, 46d; The 3rd catoptron 47a, 47b, 47c, 47d; The crooked conduct of carrying out revisal is adjusted long lens 50a, 50b, 50c, the 50d of member to the face of polygonal mirror.In this example, f θ lens 43a, 43b and long lens 50a, 50b, 50c, 50d constitute imaging len.These component parts that constitute light writing unit 4 set and are installed on the housing 100.
Specify below.Light source cell 70K, 70M, 70C, 70Y are installed on the sidewall below the housing as shown in Figure 4.Cylindrical lens 60K, 60M, 60C, 60Y, f θ lens 43a, 43b and the 1st catoptron 44a, 44b, 44c, 44d also are installed below housing.Also have, the long lens 50d that long lens 50a that the Y look uses and K look are used is installed below housing.The long lens 50b that long lens 50c that the M look uses and C look are used is installed on housing 100.In addition, long lens 50a, 50b, 50c swing are bearing in freely on support element 90a, 90b, the 90c, and are installed on the housing by support element 90a, 90b, 90c.The long lens 50b that long lens 50c that long lens 50a, the M look that the Y look is used used and C look are used is bearing on support element 90a, 90b, the 90c swingably, can adjust the surface of emission emitted laser emission angle from long lens 50.On the other hand, the long lens 50d that uses of K look directly is fixed on above the housing.Like this, in the present embodiment, sweep trace that can the K look is a benchmark, and the surface of emission emitted laser emission angle from long lens 50 is adjusted.Therefore, the long lens 50d that uses of K look does not need to be bearing on the support element swingably.Thus, only the long lens 50d that the K look is used directly is fixed on above the housing, can reduce component count.
The 2nd catoptron 46a, 46b, 46c, 46d and the 3rd catoptron 47a, 47b, 47c, 47d also are installed below housing 100.
Substantial middle portion on housing is provided with the recessed incorporating section 110 of taking in polygon-mirror motor 150 usefulness downwards, is setting sound control glass 42 on the sidewall of this incorporating section 110.Polygon-mirror motor 150 is fastened on the bottom of this incorporating section 110 by screw.
On the top of housing 100 cap member 120 is installed, undercover member 130 is installed in lower part of frame.Being provided with everywhere on cap member 120 makes respectively writes the opening that light inlet Lk, Lm, Lc, Ly pass through, and dustproof glass 48a, 48b, 48c, 48d are installed on these openings.By this cap member 120 and undercover member 130 are installed, can suppress on rubbish and dust the optical system components attached to the lens of light writing unit 4 and catoptron etc.Lower cover and loam cake are made of materials such as resin or sheet metals.
According to light signal, write light inlet from each light source cell 70Y, 70C, 70M, the 70K emission of light writing unit 4 based on the view data conversion of importing from external device (ED)s such as scanner or personal computer (not having diagram).Emission write light inlet Ly, Lc, Lm, Lk by not shown collimation lens and be located at the light inlet of writing that not shown hole on housing 100 inwalls forms the shape that formalizes.The light inlet of writing by this hole is injected to cylindrical lens 60Y, 60C, 60M, 60K, revises the face of writing light inlet is crooked.By the light inlet of writing behind cylindrical lens 60Y, 60C, 60M, the 60K, inject to the side of polygonal mirror 41a, 41b by sound control glass 42 again.When writing light inlet and inject the side of polygonal mirror 41a, 41b, this is write light inlet and is carried out deflection scanning.The light inlet of writing that is carried out deflection scanning by polygonal mirror 41a, 41b passes through f θ lens 43a, 43b.The light inlet Lk that writes of K look passes through long lens 50d, via the 1st catoptron 44d, the 2nd catoptron 46d, the 3rd catoptron 47d and dustproof glass 48d, shines on the photoreceptor of K look, forms the sub-image image on the photoreceptor of K look.The Y look write light inlet Ly and K look to write light inlet Lk same, by long lens 50a,, shine on the photoreceptor of Y look via the 1st catoptron 44a, the 2nd catoptron 46a, the 3rd catoptron 47a, and dustproof glass 48a, on the photoreceptor of Y look, form the sub-image image.The M look write light inlet Lm by the 1st catoptron 44c and by long lens 50c, then, shine on the photoreceptor of M look formation sub-image image on the photoreceptor of M look via the 2nd catoptron 46c, the 3rd catoptron 47c, dustproof glass 48c.The C look write light inlet Lc and M look to write light inlet Lm same, by the 1st catoptron 44b and by long lens 50b, then, via the 2nd catoptron 46b, the 3rd catoptron 47b, reach dustproof glass 48b, shine on the photoreceptor of C look, on the photoreceptor of C look, form the sub-image image.
Fig. 6 is a polygon-mirror motor summary pie graph.This polygon-mirror motor 150 has polygonal mirror 41a, 41b, and has the tubular catoptron rotor 151 of aluminum.This catoptron rotor 151 is fixed in the rotating shaft 152.Inner peripheral surface at catoptron rotor 151 is provided with rotor magnet 153.In the inside of catoptron rotor 151, be provided with coil 154a is wound on stator 154 on the iron core member 154b.Stator 154 be provided in relative with rotor magnet 153 to the position, be fixed on freely in the rotating shaft 152 by 158 rotations of bearing portion.
Polygon-mirror motor 150 will be in the time will writing light inlet and carry out deflection scanning, because to be rotated at a high speed, so magnetic fluid 158b frictional heating, bearing portion 158 generates heat.In addition, the not shown electronic control component on circuit substrate 157 also generates heat.Because of the bearing portion 158 of such heat generating part as polygon-mirror motor 150 and the heating of electronic control component, become high temperature in the light writing unit 4, multiplying power deviation etc. takes place in optical system components such as lens and catoptron generation thermal deformation, may produce the unfavorable condition of image deterioration.So, in the present embodiment, make heat that the heat generating part of polygon-mirror motor 150 produces to outside efficient effusion of light writing unit 4, not making in the light writing unit 4 becomes high temperature.Below, carry out specific description.
Fig. 7 is the amplification pie graph of installation portion periphery of the polygon-mirror motor 150 of this light writing unit 4.As shown in the figure, be provided with the hole, in this hole, insert bearing bridge 158a, and polygon-mirror motor 150 usefulness screws are fastened on the bottom surface of incorporating section 110 as the bearing portion 158 of the heat generating part of polygon-mirror motor 150 in the bottom surface of the incorporating section 110 of housing 100.As the lid member lower cover 130 relative with bearing bridge 158a to the position on be provided with hole 130a.The diameter d 1 of this hole 130a, make the diameter D1 that is slightly smaller than bearing bridge 158a, the sectional area with on the direction that connects the direction quadrature of lower cover hole 130a is made as below the sectional area of bearing bridge 158a and subtend face lower cover hole 130a, that is, the sectional area with connecting the direction orthogonal directions of above-mentioned lid component hole is made as is less than or equal to above-mentioned polygon-mirror motor heat generating part and sectional area lid member subtend face.Like this, dust or rubbish are difficult to enter in the light writing unit from lower cover hole 130a.Bearing bridge 158a constitutes with the high material of thermal conductivity such as brass, the heat that sends from circuit substrate 157 and just conduct to this bearing bridge 158a easily from the heat that magnetic fluid 158b sends.Also can make the inner face butt of local and lower cover hole 130a periphery below the bearing bridge 158a.But when bearing bridge 158a and lower cover butt, the heat of bearing portion 158 conducts to lower cover, and heat is heated so might make in the light unit from lower cover radiation in the light writing unit, should not use.
As the driving revolution because of polygon-mirror motor 150 the magnetic fluid 158b of bearing portion 158 is generated heat, then this heat is heated bearing bridge 158a to bearing bridge 158a conduction.In addition, the heat that not shown electronic control component takes place from the circuit substrate is by circuit substrate 157 heating bearing bridge 158a.The heat of bearing bridge 158a after being heated, the hole 130a by lower cover 130 emits to the outside of light writing unit 4.Like this, the part of the heat that takes place from polygon-mirror motor 150 owing to emit to the outside by the hole 130a of lower cover 130, can suppress the situation that light writing unit 4 interior temperature become high temperature.Since will emit hole that the heats in the light writing unit 4 use be arranged on as the polygon-mirror motor 150 of pyrotoxin relative to the position, so can emit the heat in the light writing unit 4 efficiently, with with the airtight occasion of light writing unit relatively, temperature is descended about 5 ℃.By bearing bridge 158a is cooled off, can suppress deterioration and evaporation that magnetic fluid 158b causes because of heat.Therefore, can prolong the life-span of polygon-mirror motor.
As shown in Figure 8, be provided with drawing fan 140 between the paper feeding cassette 2 of left lateral sides among the figure at device for image forming and light writing unit 4, the fixing device 6 of side, right side nearby is provided with extraction fan 143 in the drawings.And be provided with gas outlet 142, and the one end is configured near the described extraction fan 143, and the other end is configured between the paper feeding cassette 2 and light writing unit 4 on right side in the figure of device for image forming.And, be provided with drawing fan 141 at the other end of gas outlet 142.Thus, between paper feeding cassette 2 and light writing unit 4, produce D among the figure to air-flow.Via the hot gas that lower cover hole 130a emits, outside machine, emit by gas outlet 142, extraction fan.And the outer air of machine is supplied with to lower cover hole 130a by drawing fan 140.Thus, the hot gas of emitting via the hole 130a of lower cover can not be trapped in the periphery of lower cover hole 130a, and not heated air is supplied with to the periphery of the hole of lower cover 130a by drawing fan 140.Therefore, can emit the heat of polygon-mirror motor 150 well.
Below, the variation of the light writing unit 4 of present embodiment is described.Fig. 9 is the 1st variation of light writing unit.As shown in the figure, make the diameter d 2 of lower cover hole 130a, make bearing bridge 158a connect the hole 130a of lower cover greater than the diameter D1 of bearing bridge 158a.Like this, the part of bearing bridge 158a protrudes in lower cover 130, and bearing bridge 158a air direct and outside the light writing unit contacts.Thus, the heat of bearing bridge 158a is directly emitted to the outside, can emit the heat of bearing bridge 158a effectively.Because of the diameter d 2 of lower cover hole 130a is a bit larger tham the diameter D1 of bearing bridge 158, so can suppress dust and rubbish are invaded light writing unit 4 from the gap of bearing bridge 158a and lower cover hole 130a inside.
As shown in figure 10, the leading section otch of bearing bridge 158a can be formed stage portion.And, set and to make the inner diameter d 2 of lower cover hole 130a less than the outer diameter D 1 of bearing bridge 158a, and greater than the outer diameter D 1 ' of the notch portion of bearing bridge 158a.Making becomes the inner face of the part of the step of bearing bridge 158a near lower cover, and forms small gap between the inner face.Thus, make the path of the inside and outside connection of light writing unit 4 be roughly L word shape, make dust by gap between bearing bridge 158a and the lower cover hole 130a or rubbish, just can not invade in the light writing unit if then do not do parallel moving.Therefore, can suppress dust or the intrusion of rubbish in the light writing unit well.
Figure 11 is the 2nd variation of light writing unit.As shown in the figure, the structure of the 2nd variation is, the insertion portion of 110 bearing bridge 158a is provided with boss portion 111 in the incorporating section, and makes this boss portion 111 connect the hole 130a of lower cover with bearing bridge 158a.In the 2nd variation, the part of bearing bridge 158a is also outstanding from lower cover 130, and bearing bridge 158a air direct and outside the light writing unit contacts.Therefore, as the 1st variation, can emit the heat of bearing bridge 158a efficiently.In addition, as shown in figure 12, also notch 111a can be set, set and to make the inner diameter d 4 of hole 130a of lower cover less than the outer diameter D 2 of boss portion 111 at the front end of boss portion 111, and greater than the outer diameter D 3 of the notch 111a of boss portion.Make the inner face of the stage portion 111b of boss portion 111 and lower cover approaching, and inner face between form small gap.Thus, make the path of the inside and outside connection of light writing unit 4 be roughly L word shape, make dust by gap between the hole 130a of boss portion 111 and lower cover or rubbish, just can not invade in the light writing unit if then do not do parallel moving.Therefore, can suppress dust or the intrusion of rubbish in the light writing unit well.
Figure 13 is the 3rd variation of light writing unit 4.The structure of the 3rd variation is, makes the part of the hole 130a that forms lower cover to light writing unit lateral bending song, and the hole 130a of lower cover is made tubular.In the 3rd variation, also make boss portion 111 connect the hole 130a of lower cover with bearing bridge 158a.The diameter d 5 of lower cover hole 130a is set for the outer diameter D 2 of being a bit larger tham boss portion 111.In the occasion that lower cover 130 usefulness metallic sheet materials form, above-mentioned hole 130a is carried out deep-draw processing, the part of the hole 130a of feasible formation lower cover is to light writing unit lateral bending song.Set the length h of lower cover hole 130a, make it at least more than the lower cover wall thickness.Thus, the length in gap between hole 130a and the boss portion 111 is become more than the wall thickness of lower cover 130.Therefore, and the hole 130a of lower cover is not made the tubular occasion and compare, dust or rubbish are difficult to be difficult to enter in the light writing unit 4 by the gap between hole 130a and the boss portion 111.
In the 3rd variation, as shown in figure 14, also can be provided with notch 111a at the front end of boss portion 111, set the outer diameter D 2 of the inner diameter d 7 of the hole 130a that makes lower cover for less than boss portion 111, and greater than the outer diameter D 3 of the notch 111a of boss portion 111.Thus, can suppress dust or the intrusion of rubbish in the light writing unit more well.The length h of tubular hole 130a that makes lower cover 130 is preferably, if at least less than the height H of notch, just can make the part of bearing bridge 158a give prominence to from lower cover 130.
Figure 15 is the 4th variation of light writing unit 4.The 4th variation is to be provided with radiating component 131 cylindraceous on the 130a of the hole of lower cover, and bearing bridge 158a is inserted into this radiating component 131 inside.The member that radiating component 131 usefulness heat conductivities are high forms, and is weldingly fixed on the lower cover 130.Utilizing screw that radiating component 131 is fixed in occasion on the lower cover 130, on radiating component, be provided with the hole, in the time of in the hole of radiating component 131 being inserted lower covers, in advance lower cover relative with radiating component to partly interior week threaded hole is set.In the hole by screw being screwed into radiating component and the screw of lower cover, radiating component 131 can be fixed on the lower cover 130.In addition, be the occasion of metallic sheet material at lower cover, above-mentioned screw can form with the screw tap cutting, is the occasion of resinousness material at lower cover, can make convex shape, and side face is provided with thread groove within it.
The heat of bearing bridge 158a is directly emitted simultaneously to the outside, conducts to radiating component 131, emits to the outside from radiating component 131.Therefore, can emit the heat of bearing bridge efficiently.Be preferably, the inner diameter d 6 of radiating component 131 is made the outer diameter D 2 of being a bit larger tham boss portion 111a, make dust or rubbish be difficult to enter from gap between boss portion 111 and the radiating component 131.
Figure 16～Figure 17 is the 5th variation of light writing unit 4.The 5th variation is that subtend face 110a 111 and lower cover 130 is provided with four 113a of wall portion, 113b, 113c, the 113d that bearing bridge 158a (or boss portion 111a) is surrounded in the incorporating section.As shown in figure 16, be provided with four the outstanding polygon-mirror motor installation base 112a of portion, 112b, 112c, 112d on subtend face 110a, the 113a of wall portion is located near the connecting line of 112a of installation base portion and the 112b of installation base portion.The 113b of wall portion is located near the connecting line of 112b of installation base portion and the 112c of installation base portion, the 113c of wall portion is located near the connecting line of 112c of installation base portion and the 112d of installation base portion, and the 113d of wall portion is located near the connecting line of 112d of installation base portion and the 112a of installation base portion.As shown in figure 17, also can make the annular wall portion 113 that the 112a of installation base portion, 112b, 112c, 112d are surrounded.Form the height of wall portion, make that the gap of the top of wall portion 113 and lower cover inner face is small.Like this, because the top of wall portion 113 and the gap between the lower cover inner face can suppress by the dust in gap between boss portion 111 and the lower cover hole 130a or the zone that rubbish enters optical system components such as setting lens and catoptron.Thus, can suppress dust or rubbish and pay on the optical system components of lens or catoptron etc., can suppress to produce abnormal images such as black streaking image.
As shown in figure 18, be the tubular occasion at lower cover hole 130a, set the tubular length of lower cover hole 130a and the height of wall portion 113, form lower cover hole 130a and the 113 lap B of wall portion.Thus, form labyrinth passage, can make dust or rubbish be difficult to arrive the zone that sets optical element by boss portion 111 and lower cover hole 130a by lower cover hole 130a and wall portion 113.Like this, dust can further be suppressed or rubbish enters the zone that sets optical system components in the light writing unit.In the occasion that the radiating component 131 shown in the 4th variation is set, also can further suppress dust or rubbish and enter the zone that sets optical system components in the light writing unit by making radiating component 131 and wall portion 113 overlapping.
In the present embodiment, as shown in Figure 1, be described being applicable to the device for image forming that light writing unit 4 is positioned at each photoreceptor below, but can be applicable to that also the light writing unit is positioned at the device for image forming of each photoreceptor top.In this occasion, the light writing unit only is oppositely to be installed in the device body up and down.This occasion, above-mentioned lower cover 130 is positioned at the top of housing 100, and lower cover hole 130a is positioned at the top as the bearing bridge 158a of heat generating part.In this occasion, because of the heating of bearing bridge 158a, the inner updraft that passes through the lower cover hole and overflow to the outside from the unit takes place.Because such updraft takes place, and dust or rubbish just are difficult to enter the lower cover hole.In the present embodiment, bearing portion 158 generates heat because of polygon-mirror motor drives, relative with the bearing bridge 158a of described bearing portion 158 to the position hole is set, but the present invention is not limited to this.Also the electronic control component that can generate heat when driving polygon-mirror motor be configured to relative with lower cover to, relative with the electronic control component of this heating to the position hole is set.Like this, because of the heat that takes place from electronic control component is directly emitted via the lower cover hole, so the temperature that can suppress in the light writing unit 4 rises.
According to the light writing unit as optical writing device of present embodiment, the lid member with as bearing portion heat generating part, that generate heat when driving polygon-mirror motor relative to the position hole is set, so directly emit by the hole to the outside by the heat of bearing portion generation.Thus, compare, can efficiently the heat of polygon-mirror motor bearing portion be emitted to the outside with the heat occasion of emitting polygon-mirror motor bearing portion by the lid member indirectly.
This enforcement according to the present invention, be made as the sectional area with direction perforation direction quadrature the hole of lid member polygon-mirror motor bearing portion with below sectional area lid member subtend face, that is, the sectional area with connecting the direction orthogonal directions of above-mentioned lid component hole is made as is less than or equal to above-mentioned polygon-mirror motor heat generating part and sectional area lid member subtend face.So can suppress dust or rubbish enters from the hole of cover component.
According to the light writing unit of above-mentioned variation 1, the part of bearing portion inserted cover in the hole of member, so the obstructed via hole of the heat of bearing portion but directly emit to the outside.Thus, can efficiently the heat of polygon-mirror motor bearing portion be emitted to the outside.
According to the light writing unit of above-mentioned variation 1, make the gap of the hole inner peripheral surface of the bearing portion of polygon-mirror motor and above-mentioned lid member become small, enter from the gap of the hole inner peripheral surface of the bearing portion of polygon-mirror motor and above-mentioned lid member so can suppress dust or rubbish.
According to the light writing unit of above-mentioned variation 1, as shown in figure 10, the part in the hole of the insertion lid member of above-mentioned bearing portion is formed otch.Thereby the path of the inside and outside connection of light writing unit 4 becomes roughly L word shape, and dust by gap between bearing portion and the lower cover hole or rubbish just can not be invaded in the light writing unit if do not follow parallel moving.Thus, can suppress dust or the intrusion of rubbish in the light writing unit well.
According to the light writing unit of above-mentioned variation 2, the part of bearing bridge is inserted into the boss portion of housing, the part of bearing bridge is inserted in the hole of above-mentioned lid member with boss portion.And, make the boss portion and the gap of the hole inner peripheral surface of lid member become small.Therefore, can suppress dust or rubbish enters from gap between the hole inner peripheral surface of boss portion and above-mentioned cover component.By the cooling bearing support, can suppress deterioration and evaporation that the heat because of magnetic fluid causes.Thus, can prolong the life-span of polygon-mirror motor.
Light writing unit according to above-mentioned variation, the part that above-mentioned boss portion is inserted in the hole forms otch, the path of the inside and outside connection of light writing unit 4 becomes roughly L word shape, dust by gap between boss portion and the lower cover hole or rubbish just can not be invaded in the light writing unit if do not follow parallel moving.Thus, can suppress dust or the intrusion of rubbish in the light writing unit well.
According to the light writing unit of above-mentioned variation 5, the wall portion that surrounds above-mentioned boss portion is set on above-mentioned housing.Thus, can stop by the dust in gap or the zone that rubbish enters optical system components such as setting lens and catoptron between boss portion and the lid component hole with this wall portion.Therefore, can suppress dust or rubbish etc. is attached on the optical system components such as lens or catoptron.
According to the light writing unit of above-mentioned variation, above-mentioned wall portion is done circlewise, so can stop by boss portion more reliably and cover the dust in gap between the component hole or the zone that rubbish enters optical system components such as setting lens and catoptron with wall portion.
According to the light writing unit of above-mentioned variation, set wall portion height, make the part of outer peripheral face of above-mentioned lid component hole relative with the part of above-mentioned wall portion to.Thus, it is elongated to make dust or rubbish enter the path in zone of optical system components such as setting lens and catoptron, can suppress dust more reliably or rubbish enters the zone that sets optical system components.
According to the light writing unit of above-mentioned variation 3, the hole of above-mentioned lid member is made cylindric, make the wall thickness of the length of cylinder greater than the lid member.Thus, can be more than the lower cover wall thickness with the length in gap between hole and boss portion or the bearing portion.Thus, and the hole of lower cover is not made the tubular occasion and compare, dust or rubbish are difficult to the gap by the gap of hole and boss portion or hole and bearing portion, and therefore, dust or rubbish are difficult to enter in the light writing unit.
Light writing unit according to above-mentioned variation 3 is installed in radiating component in the hole of above-mentioned lid member, so the heating of bearing portion directly can be emitted to the outside, conducts to radiating component simultaneously, emits to the outside from radiating component.Thus, can effectively the heat of bearing portion be emitted.
According to the light writing unit of above-mentioned variation, by the hole being arranged on the top of bearing portion, because of the inner updraft of overflowing to the outside by the lower cover hole from the unit takes place in the bearing bridge heating.By the generation of such updraft, can suppress dust or rubbish and enter in the hole of covering member.
According to the invention described above embodiment,, also can efficiently the heat of bearing portion be emitted even above-mentioned lid member is configured in the below of above-mentioned housing.
According to the device for image forming of the invention described above embodiment, because have the optical writing device of the invention described above (1)～(14), owing to will write the tram of rayed to sub-image mounting body, so image disorder and colo(u)r bias etc. can not take place.
Above with reference to description of drawings embodiments of the invention, but the present invention is not limited to the foregoing description.Can do all changes in the technology of the present invention thought range, they all belong to protection scope of the present invention.
Claims (4)
1. optical writing device, in its housing, taken in:
Luminous light source portion;
The revolution polygonal mirror makes the light that described light source portion takes place carry out deflection scanning for sub-image mounting surface along main scanning direction;
Polygon-mirror motor drives described revolution polygonal mirror revolution;
Imaging len is used for making and carries out light imaging on sub-image mounting surface of deflection scanning by this revolution polygonal mirror;
Cover the open portion of this housing with the lid member, it is characterized in that:
The heat generating part of generating heat when driving this polygon-mirror motor of this lid member relative to the position hole is set, this heat generating part is the bearing portion of polygon-mirror motor,
The sectional area with connecting the direction orthogonal directions of above-mentioned lid component hole is made as less than above-mentioned polygon-mirror motor heat generating part and sectional area lid member subtend face, promptly, the diameter of above-mentioned lid component hole makes the diameter less than the bearing bridge of bearing portion, and the sectional area with on the direction that connects the direction quadrature of above-mentioned lid component hole is made as below the sectional area of bearing bridge and subtend face above-mentioned lid component hole.
2. optical writing device as claimed in claim 1 is characterized in that:
The hole of above-mentioned lid member is arranged on the top of above-mentioned polygon-mirror motor heat generating part.
3. optical writing device as claimed in claim 1 is characterized in that:
Above-mentioned lid member is configured in the below of above-mentioned housing.
4. image processing system is characterized in that:
Be provided with each described optical writing device as claim 1～3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005374165 | 2005-12-27 | ||
| JP2005374165A JP4676328B2 (en) | 2005-12-27 | 2005-12-27 | Optical writing apparatus and image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1991436A CN1991436A (en) | 2007-07-04 |
| CN100557476C true CN100557476C (en) | 2009-11-04 |
Family
ID=38213819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101714112A Expired - Fee Related CN100557476C (en) | 2005-12-27 | 2006-12-26 | Optical writing device and image processing system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4676328B2 (en) |
| CN (1) | CN100557476C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5219548B2 (en) * | 2008-02-22 | 2013-06-26 | キヤノン株式会社 | Optical scanning device |
| JP5901336B2 (en) * | 2011-04-20 | 2016-04-06 | キヤノン株式会社 | Optical scanning device and image forming apparatus having the same |
| JP2015141213A (en) * | 2014-01-27 | 2015-08-03 | シャープ株式会社 | Optical scanner and image forming apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH049954U (en) * | 1990-05-17 | 1992-01-28 | ||
| JP3192271B2 (en) * | 1993-04-13 | 2001-07-23 | キヤノン株式会社 | Optical deflector |
| JP2001255487A (en) * | 2000-03-10 | 2001-09-21 | Fuji Xerox Co Ltd | Optical scanner |
-
2005
- 2005-12-27 JP JP2005374165A patent/JP4676328B2/en not_active Expired - Fee Related
-
2006
- 2006-12-26 CN CNB2006101714112A patent/CN100557476C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1991436A (en) | 2007-07-04 |
| JP4676328B2 (en) | 2011-04-27 |
| JP2007178511A (en) | 2007-07-12 |
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Granted publication date: 20091104 Termination date: 20181226 |