CN104834087A - Polygon mirror, light scanning device, image forming device, and manufacturing method for polygon mirror - Google Patents
Polygon mirror, light scanning device, image forming device, and manufacturing method for polygon mirror Download PDFInfo
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- CN104834087A CN104834087A CN201510076679.7A CN201510076679A CN104834087A CN 104834087 A CN104834087 A CN 104834087A CN 201510076679 A CN201510076679 A CN 201510076679A CN 104834087 A CN104834087 A CN 104834087A
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- polygonal mirror
- recess
- reflecting surface
- protuberance
- multiple reflecting
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Abstract
The objective of the invention lies in providing a polygon mirror high in molding performance, a light scanning device with the polygon mirror, an image forming device with the light scanning device, and a manufacturing method for the polygon mirror. The polygon mirror is formed through resin molding, and is provided with a plurality of reflection surfaces, wherein one side surface intersected with the plurality of reflection surfaces serves as a first surface, and the other side surface intersected with the plurality of reflection surfaces serves as a second surface. The polygon mirror is provided with a concave part which is recessed from the second surface at the center of the second surface; a convex part which is bulged from the first surface, and is overlapped with the concave part during the observation in a direction perpendicular to the second surface.
Description
Technical field
The present invention relates to the polygonal mirror formed by resin forming, the light scanning apparatus with this polygonal mirror, there is the image processing system of this light scanning apparatus and the manufacture method of polygonal mirror.
Background technology
In the past, the known polygonal mirror (with reference to patent documentation 1) formed by resin forming.This polygonal mirror is by from being arranged on the cast gate resin by injection of central authorities of mould and shaping.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 3-214116 publication
Summary of the invention
But, when polygonal mirror is configured to have recess and this recess embeds for the motor making polygonal mirror rotate, the reduction compared with the wall thickness of the part except recess of the wall thickness of the part corresponding with recess, therefore, when resin forming, the mobility of depositing resin is in the portion deteriorated and makes the possibility that the processability of polygonal mirror is deteriorated.
The present invention completes in view of above-mentioned background, and object is to provide the polygonal mirror that processability is improved, the light scanning apparatus with this polygonal mirror, has the image processing system of this light scanning apparatus and the manufacture method of polygonal mirror.
To achieve these goals, polygonal mirror of the present invention is formed by resin forming, comprising: multiple reflecting surface; First surface, it is the face of the side intersected with described multiple reflecting surface; And second, it is the face of the opposite side intersected with described multiple reflecting surface, and described polygonal mirror comprises: recess, at the central portion of described second from described second depression; And protuberance, give prominence to from described first surface, from observing overlapping with described recess with described second orthogonal direction.
According to this structure, the variable quantity of the wall thickness of the part corresponding with recess and part in addition reduces, and therefore compared with the structure not having protuberance, the mobility of resin can be made when shaping to improve.Therefore, it is possible to make the processability of polygonal mirror improve.
In such a configuration, the profile of described recess can be configured to circle, and the profile of described protuberance can be configured to circle.
According to this structure, compared with not being circular structure with the profile of recess and protuberance, the mobility of resin when can make shaping improves.
In the structure that the profile of above-mentioned recess is circular, the diameter of the profile of preferred described protuberance is the size of more than the diameter of the profile of described recess.
If the diameter of the profile of protuberance is less than the diameter of the profile of recess, there is the less part of wall thickness in the junction of the part not corresponding with protuberance then in recess, the mobility of resin is likely caused to be deteriorated, but according to above-mentioned structure, the part that such wall thickness is less can not be there is, therefore, it is possible to make the mobility of resin improve.
In such a configuration, can be configured to, described polygonal mirror has the through hole that the central authorities in the bottom surface of described recess are formed.
In such a configuration, can be configured to, described polygonal mirror has the teat outstanding from described first surface in the outside of described protuberance.Further, in the structure shown here, can be configured to, described teat is greater than the overhang of described protuberance from described first surface from the overhang of described first surface.
According to this structure, such as, when polygonal mirror is the structure be pressed from first surface side, only teat is pressed, and therefore pressure is not easily delivered to protuberance, can suppress convex part deformation.
In such a configuration, can be configured to, described recess is greater than the overhang of described protuberance from described first surface from the amount of recess of described second.Further, described recess is the over half of distance between described first surface and described second from the amount of recess of described second.
According to this structure, by increasing the amount of recess of recess, such as when motor to be embedded in recess and the structure making polygonal mirror consistent with motor center, easily carry out the location on the direction orthogonal with turning axle direction.Further, the volume of products formed can be reduced, cost can be realized and reduce.
In addition, light scanning apparatus of the present invention can be configured to comprise: light source, outgoing beam; Polygonal mirror, formed by resin forming, the face of the side comprise multiple reflecting surface, intersecting with described multiple reflecting surface and first surface and that is second, the face of opposite side intersected with described multiple reflecting surface, described polygonal mirror has at the central portion of described second from the recess of described second depression and give prominence to from described first surface and observe the protuberance overlapping with described recess from described second orthogonal direction; Motor, is embedded in described recess; And scanning optics, for the light beam imaging of will be reflected by described polygonal mirror.
In addition, image processing system of the present invention can be configured to comprise: light source, outgoing beam; Polygonal mirror, formed by resin forming, the face of the side comprise multiple reflecting surface, intersecting with described multiple reflecting surface and first surface and that is second, the face of opposite side intersected with described multiple reflecting surface, described polygonal mirror has at the central portion of described second from the recess of described second depression and give prominence to from described first surface and observe the protuberance overlapping with described recess from described second orthogonal direction; Motor, is embedded in described recess; Scanning optics, for the light beam that will be reflected by described polygonal mirror in photoreceptor imaging; And developing apparatus, to described photoreceptor supply developer.
In addition, to achieve these goals, the invention provides a kind of manufacture method of polygonal mirror, this polygonal mirror comprises: multiple reflecting surface; First surface, it is the face of the side intersected with described multiple reflecting surface; Second, it is the face of the opposite side intersected with described multiple reflecting surface; Recess, at the central portion of described second from described second depression; And protuberance, from described second outstanding, observe overlapping with described recess from the direction orthogonal with described first surface.Comprise following operation in the method: preparatory process, prepare mould, this mould has the cavity corresponding with the shape of described polygonal mirror, and possesses the cast gate for resin by injection in the position corresponding with the central authorities of described protuberance; And molding procedure, carry out shaping from described cast gate resin by injection.
According to this manufacture method, the variable quantity of the wall thickness of the part of recess and part in addition reduces, and therefore compared with the shape not having protuberance, the mobility of resin can be made to improve.
In addition, the invention provides the manufacture method of another kind of polygonal mirror, this polygonal mirror comprises: multiple reflecting surface; First surface, it is the face of the side intersected with described multiple reflecting surface; Second, it is the face of the opposite side intersected with described multiple reflecting surface.Comprise following operation in the method: preparatory process, prepare mould, this mould has the cavity corresponding with the shape of described polygonal mirror, and possesses the cast gate for resin by injection in the position corresponding with the central authorities of described first surface; Molding procedure, carries out shaping from described cast gate resin by injection; And perforate operation, offer through hole in the position corresponding with described cast gate.
According to this manufacture method, after taking out products formed from mould, offer through hole, therefore, it is possible to carry out shaping under the state of the wall thickness at the position of maintenance through hole.Therefore, it is possible to the mobility of resin when making shaping improves.
Have in the manufacture method of perforate operation above-mentioned, preferably utilize drill bit to process described through hole.
According to this manufacture method, through hole can be offered by simple method.
Accompanying drawing explanation
Fig. 1 is the cut-open view of the laser printer involved by an embodiment.
Fig. 2 is the vertical view of scanner.
Fig. 3 observes the stereographic map (a) of polygonal mirror and observes the stereographic map (b) of polygonal mirror from second side from first surface side.
Fig. 4 is I-I cut-open view (c) observing the figure (a) of polygonal mirror, the side view (b) of polygonal mirror and figure (a) from first surface side.
Fig. 5 is the amplification stereogram (a) of the joint face of polygonal mirror and observes the figure (b) scheming (a) from I I direction.
Fig. 6 is the enlarged drawing of the joint face part of Fig. 4 (a).
Fig. 7 is the cut-open view of cutting on the diagonal line of the polygonal mirror of light deviator.
Fig. 8 is the cut-open view (b) of the cut-open view (a) of the mould of polygonal mirror and the products formed from mould taking-up.
Fig. 9 is the figure suitable with Fig. 6, comprises the figure (a) involved by the first variation and the figure (b) involved by the second variation.
Figure 10 is the figure observing polygonal mirror from first surface side, comprises the figure (a) involved by the 3rd variation and the figure (b) involved by the 4th variation.
Figure 11 is the figure observing the polygonal mirror involved by the 5th variation from first surface side.
Embodiment
Below, the embodiment that suitably present invention will be described in detail with reference to the accompanying.In addition, in the following description, first the one-piece construction of the laser printer 1 of an example of the image processing system as an embodiment of the invention is described, then describes characteristic of the present invention in detail.
In the following description, about direction, so that user during use laser printer is described as the direction of benchmark.That is, in FIG, be set to towards left side during paper " front side ", be set to towards right side during paper " rear side ", be set to towards inboard during paper in " left side ", be set to towards nearby side during paper on " right side ".Further, be set to towards above-below direction during paper " above-below direction ".
As shown in Figure 1, laser printer 1 mainly comprises apparatus main body 2, paper feed portion 3, scanner 4, handle box 5 and fixing device 8 as an example of light scanning apparatus.
Apparatus main body 2 has the protecgulum 23 that can rotate relative to apparatus main body 2.This protecgulum 23 is opened to front side and insert port 21B is opened wide, thus can by paper 33 from insert port 21B insertion apparatus main body 2.
Paper feed portion 3 is positioned at the bottom of apparatus main body 2, has the paper-feeding mechanism 32 of the paper 33 on paper supply tray 31 for loading paper 33 and feed paper supply tray 31.
Paper supply tray 31 is made up of the mounting table 31A configured in the bottom of apparatus main body 2 and above-mentioned protecgulum 23.Paper-feeding mechanism 32 mainly has paper feed roller 32A, separate roller 32B and separating pad 32C.
In paper feed portion 3, the paper 33 be positioned on paper supply tray 31 is sent by paper feed roller 32A, is one by one separated, and transmits towards handle box 5 between separate roller 32B and separating pad 32C.
Scanner 4 is arranged at the front side in apparatus main body 2, and laser is scanned on the surface of photosensitive drums 61 described later.Details about the structure of scanner 4 carries out describing later.
Handle box 5 is positioned near the rear side central portion of apparatus main body 2, is arranged at the top of paper-feeding mechanism 32.Handle box 5 is configured to be loaded and unloaded relative to apparatus main body 2 towards front, upside by opening 21A, this opening 21A is formed when being opened wide by the top cover 24 being arranged at apparatus main body 2 rotationally, and handle box 5 has the Delevoping cartridge 7 of drum unit 6 and the example as developing apparatus.
Drum unit 6 has the photosensitive drums 61 of the example as photoreceptor, charged device 62 and transfer roll 63.Delevoping cartridge 7 has developer roll 71 and donor rollers 72.
In Delevoping cartridge 7, the toner being accommodated in toner accommodation indoor is supplied to developer roll 71 by donor rollers 72, by friction belt positive electricity, and is carried on developer roll 71.In drum unit 6, after the surface of the photosensitive drums 61 of rotation is similarly charged by charged device 62, utilizes the high-velocity scanning from the laser beam of scanner 4 and be exposed.Thus, the current potential of the part be exposed declines, and forms the electrostatic latent image based on view data on the surface of photosensitive drums 61.
Then, to the supply of this electrostatic latent image from the toner of Delevoping cartridge 7, the surface of photosensitive drums 61 forms toner image.Then, between photosensitive drums 61 and transfer roll 63, transmit paper 33, thus the toner image being carried on the surface of photosensitive drums 61 is transferred on paper 33.
Fixing device 8 is positioned at the upper back of apparatus main body 2, is configured in the top of handle box 5.Fixing device 8 mainly has warm-up mill 81 and backer roll 82.
In addition, in the fixing device 8 formed in the above described manner, during paper 33 passes through between warm-up mill 81 and backer roll 82, heat carried out to the toner be transferred on paper 33 fixing.In addition, the paper 33 be heat-fixed at fixing device 8 is sent to the distributing roller 9 in the downstream being configured at fixing device 8, and is discharged to top cover 24 from this distributing roller 9.
As depicted in figs. 1 and 2, scanner 4 has semiconductor laser 41, coupled lens (coupling lens) 42, aperture diaphragm 43, lens pillar 44, light deviator 100, scanning lens 45 etc. as an example of scanning optics.In addition, semiconductor laser 41 and coupled lens 42 are examples for light source.These each elements are supported in framework 40A.The laser penetrated from semiconductor laser 41 according to shown in dot-and-dash line successively by coupled lens 42, aperture diaphragm 43, lens pillar 44, light deviator 100, scanning lens 45 and in photosensitive drums 61 imaging.
As shown in Figure 2, semiconductor laser 41 is the devices of the laser sending diffusion.The light-emitting component of semiconductor laser 41 glimmers (bright Destroy) by not shown control device accordingly with the image that should expose on the surface of photosensitive drums 61.
Coupled lens 42 is the lens laser penetrated from semiconductor laser 41 being converted to light beam.Aperture diaphragm 43 specifies the diameter of the laser being converted to light beam by coupled lens 42.Lens pillar 44 be make have passed aperture diaphragm 43 laser on polygonal mirror 110 described later along the lens of sub scanning direction (direction vertical with the paper of Fig. 2) imaging.
As shown in Figure 1, light deviator 100 has polygonal mirror 110, motor 120 and pressing component 130.Details about light deviator 100 carries out describing later.
As shown in Figure 2, scanning lens 45 is the light that makes to be partial to by reflecting at polygonal mirror 110 lens in the surperficial imaging of photosensitive drums 61.Further, scanning lens 45 has and makes the light by polygonal mirror 110 is partial to constant angular velocity scan such f θ characteristic with equal velocity on the surface of photosensitive drums 61.
Then, the details of light deviator 100 is described.
Polygonal mirror 110 is as lower component: formed by resin forming, rotates, the laser that have passed lens pillar 44 is partial to along main scanning direction centered by the turning axle 121 of motor 120 with constant speed.The reflectance coating of polygonal mirror 110 aluminium etc. at surperficial evaporation, and form the square column shape with roughly foursquare bottom surface.
As shown in Fig. 1, Fig. 3 (a) and (b), polygonal mirror 110 comprises: four (multiple) reflectings surface 111, forms side; First surface 112A, forms the bottom surface with rotor portions 122 opposite side (side intersected with four reflectings surface 111) of the aftermentioned motor 120 axially of turning axle 121; Second 112B, forms the bottom surface of rotor portions 122 side (opposite side intersected with four reflectings surface 111) axially of turning axle 121; And four joint faces 113, a part for side is formed together with four reflectings surface 111.In addition, in the following description, by turning axle 121 axially referred to as axis.
Four reflectings surface 111 are formed with plane, as Fig. 5 (b) illustrates turgidly, to tilt along with the mode of the central authorities from first surface 112A towards second 112B near second 112B.In addition, herein so-called plane comprise be not completely plane and the enough large convex surface of radius-of-curvature or concave surface, there is the plane of trickle distortion.
As shown in Fig. 4 (a), four reflectings surface 111 have the first reflecting surface 111A, the second reflecting surface 111B adjacent with the first reflecting surface 111A, the three reflecting surface 111C adjacent with the first reflecting surface 111A in the opposition side of the second reflecting surface 111B and the four reflecting surface 111D adjacent with the second reflecting surface 111B and the 3rd reflecting surface 111C in the opposition side of the first reflecting surface 111A.
Four reflectings surface 111 be configured to diagram counterclockwise on the first reflecting surface 111A for starting point, adjacent one another are according to the order of the second reflecting surface 111B, the 4th reflecting surface 111D, the 3rd reflecting surface 111C.That is, as shown in Figure 2, each reflecting surface 111 is configured to, and when the first reflecting surface 111A folded light beam, the second reflecting surface 111B is positioned at the side far away apart from scanning lens 45 than the 3rd reflecting surface 111C.Now, scope and significant surface S for reflecting the light beam penetrated from semiconductor laser 41 are positioned at the position of close scanning lens 45 side of the first reflecting surface 111A.That is, as shown in Fig. 4 (b), the significant surface S of the first reflecting surface 111A is configured in its center S1 compared to the position of the second reflecting surface 111B closer to the 3rd reflecting surface 111C.In other words, the distance E1 from the center S1 of the significant surface S of the first reflecting surface 111A to the 3rd reflecting surface 111C is less than the distance E2 from this center S1 to the second reflecting surface 111B.
As shown in Fig. 4 (a), joint face 113 is faces of each reflecting surface in connection four reflectings surface 111, is respectively provided with a joint face 113, is provided with four altogether between adjacent reflecting surface 111.In addition, in the following description, only the joint face 113 between connection first reflecting surface 111A and the second reflecting surface 111B is described, about other joint faces 113, owing to being identical structure, therefore omits the description.
As shown in Figure 6, joint face 113 has barrel surface and the circular arc section of radius of curvature R 1.
And, distance D1 from joint face 113 and the extended surface A of link position 113C to the first reflecting surface 111A of the first reflecting surface 111A and the intersection L of the extended surface B of the second reflecting surface 111B, is greater than from the distance D2 the link position 113D to this intersection L of joint face 113 and the second reflecting surface 111B.Thereby, it is possible to make the curve form that joint face 113 is formed as level and smooth.In addition, preferred distance D1 is more than 150% of distance D2, and further preferred distance D1 is more than 300% of distance D2.Further, preferred distance D1 is less than 0.5% of the distance E (with reference to Fig. 4 (b)) of the second reflecting surface 111B and the 3rd reflecting surface 111C.
As shown in Fig. 5 (a), except connecting the first reflecting surface 111A and the second reflecting surface 111B, joint face 113 also connects first surface 112A and second 112B.It is longer than the coupling part 113B of itself and second 112B that joint face 113 is configured to its coupling part 113A with first surface 112A.That is, joint face 113 is along with towards first surface 112A skidding and then broaden.
In addition, as shown in Fig. 4 (a), (b), (c), polygonal mirror 110 is provided with: recess 114, from second 112B depression; Protuberance 115, gives prominence to from first surface 112A; As the first teat 116 of an example of teat, give prominence to from first surface 112A in the outside of protuberance 115; And second teat 117, give prominence to from second 112B in the outside of recess 114.
Recess 114 is parts that the rotor portions 122 of electric motor 120 is fitted together to, and is configured in the central portion of second 112B.The profile of recess 114 is rounded, is formed with through hole 114B through vertically in the central authorities of bottom surface 114A.This through hole of turning axle 121 break-through 114B of motor 120.
Protuberance 115 is configured in the position corresponding with recess 114 of first surface 112A, is namely configured in and observes the position overlapping with recess 114 from axial (direction orthogonal with second 112B).Later time, the variable quantity from the part corresponding with recess 114 of end on observation polygonal mirror 110 and the wall thickness of part the section (section shown in Fig. 4 (c)) comprising turning axle 121 in addition can be reduced.
In addition, preferably, the thickness T2 of the diagram upper end from the bottom surface 114A of recess 114 to protuberance 115 is more than 30% of the thickness T1 of polygonal mirror 110.Thereby, it is possible to the mobility of resin when making resin forming improves.
The profile of protuberance 115 is rounded, and diameter (diameter maximum in the diagram lower end of the protuberance 115 shown in Fig. 4 (the c)) F1 being configured to its profile is greater than the diameter F2 of the profile of recess 114.Thus, protuberance 115 is configured in the gamut of recess 114.Therefore, the change comprising the wall thickness in the section of turning axle 121 of polygonal mirror 110 reduces, the good fluidity of resin time therefore shaping.In addition, the diameter F1 of the profile of protuberance 115 also can be the size identical with the diameter F2 of the profile of recess 114.Further, preferably, the diameter F2 of the profile of recess 114 is less than 35% of cornerwise length Y of polygonal mirror 110.
As shown in Fig. 4 (a), the first teat 116 is the parts pressed by pressing component 130, to be provided with four around the mode of protuberance 115.Each first teat 116 from having circular profile during end on observation, and has hemispheric surface (with reference to Fig. 4 (b)).
First teat 116 is arranged on each line of the center P (center of first surface 112A) connecting each summit of first surface 112A and the turning axle 121 of motor 120, is respectively X and equal with the distance of the center P of turning axle 121.That is, each first teat 116 can be made mutually the same relative to the position relationship on close summit.Further, preferably, each first teat 116 and the center P of turning axle 121 distance X polygonal mirror 110 cornerwise length Y 19 ~ 38% scope in.
In addition, the diameter F2 of the profile of preferred recess 114 is F2<2X, and preferably the diameter F1 of the profile of protuberance 115 is F1<2X.And, also can be, when recess 114 is positioned at the position in the inner part, inner edge than the first teat 116 in Fig. 4 (c), the distance X of each first teat 116 and the center P of turning axle 121 polygonal mirror 110 cornerwise length Y 10 ~ 38% scope in.
Second teat 117 is the parts contacted with the rotor portions 122 of motor 120, is provided with four (with reference to Fig. 3 (b), Fig. 7) in the position corresponding with the first teat 116.That is, the second teat 117 configures overlappingly from end on observation and the first teat 116.Further, the second teat 117 from having circular profile during end on observation, and has hemispheric surface.In addition, the second teat 117 also can be and the identical shape of the first teat 116.In addition, the second teat 117 also can be that surface is formed with plane, and entirety is cylindrical shape.
As shown in Figure 7, motor 120 is parts that polygonal mirror 110 is rotated, and has turning axle 121 and the rotor portions 122 for fixing turning axle 121.
Motor 120 has the coil 124 of the magnet 123 that is fixed on rotor portions 122 and the stator side in the face of magnet 123.Motor 120 is configured to by being energized by coil 124 and makes magnet 123 bear acting force and rotor portions 122 is rotated.
Rotor portions 122 has rotor protuberance 122B, and this rotor protuberance 122B gives prominence to from the rotor cover 122A towards polygonal mirror 110 side, and has the outer peripheral face coaxial with turning axle 121.The outer peripheral face of this rotor protuberance 122B embeds recess 114, thus makes polygonal mirror 110 consistent with motor 120 center.
At this, be configured to as Suo Shi Fig. 4 (c), above-mentioned recess 114 is greater than the overhang H2 of protuberance 115 from first surface 112A from the amount of recess H1 of second 112B.That is, the amount of recess of the recess 114 embedded for rotor protuberance 122B is fully guaranteed.In addition, preferably, amount of recess H1 polygonal mirror 110 thickness T1 20 ~ 80% scope in.Further, further preferably, amount of recess H1 is 60 ~ 70% (over half) of the thickness T1 of polygonal mirror 110, and from the center 111E of the axis of reflecting surface 111 when observing with axially vertical direction and recess 114 overlapping.Thereby, it is possible to specify the position of reflecting surface 111 exactly relative to rotor portions 122.
In addition, as shown in Figure 7, rotor portions 122 is when rotor protuberance 122B embeds in recess 114, and its rotor cover 122A contacts with the second teat 117.That is, rotor cover 122A only contacts with polygonal mirror 110 in the part of the second teat 117.That is, in the part except the second teat 117, polygonal mirror 110 and rotor cover 122A spaced apart.
Pressing component 130 has flexible parts, and configure in the mode of the first surface 112A covering polygonal mirror 110.Pressing component 130 is configured to its central portion and is formed as convex in diagram upside, contacts with the first teat 116 at diagram two ends, left and right.Pressing component 130 arranges porose 131 in the central portion, and this hole 131 is formed as the size that can be pressed into for the turning axle 121 through the motor 120 of through hole 114B.Pressing component 130, by turning axle 121 being pressed into the bend portions in this hole 131 between the first teat 116 and hole 131, produces the acting force to diagram below.Further, pressing component 130 presses polygonal mirror 110 in the position of the first teat 116 vertically towards the rotor portions 122 of motor 120.
At this, as shown in Fig. 4 (c), the first above-mentioned teat 116 is greater than the overhang H2 of protuberance 115 from first surface 112A from the overhang H3 of first surface 112A.Therefore, polygonal mirror 110 is only pressed by pressing component 130 at the first teat 116.
Below, the manufacture method of polygonal mirror 110 is described.
The mould 140 as shown in Fig. 8 (a) is used in the manufacture method of the polygonal mirror 110 involved by present embodiment.Mould 140 has the cavity C corresponding with the shape of polygonal mirror 110.
Specifically, mould 140 is made up of the first mould 141 and the second mould 142.First mould 141 has: first surface forming surface 141A, corresponding to first surface 112A; Protuberance forming surface 141B, caves in, corresponding to protuberance 115 from first surface forming surface 141A; And the first teat forming surface 141C, cave in from first surface forming surface 141A, corresponding to the first teat 116.Further, the cast gate G for resin by injection is provided with in the position that the central authorities of protuberance forming surface 141B are namely corresponding with the central authorities of protuberance 115.
Second mould 142 has: second forming surface 142A, corresponding to second 112B; Recess forming surface 142B, gives prominence to, corresponding to recess 114 from second forming surface 142A; Second teat forming surface 142C, from second forming surface 142A depression, corresponding to the second teat 117; And reflecting surface forming surface 142D, corresponding to reflecting surface 111.
Prepare such mould 140 (preparatory process), carry out shaping (molding procedure) from cast gate G resin by injection.After shaping, take out products formed 110A (with reference to Fig. 8 (b)) from mould 140 (the second mould 142), offer through hole 114B (perforate operation) in the position corresponding to cast gate G.Further, in perforate operation, excellent Choice of Bits is processed.In addition, manufactured to the manufacture method of the manufacture method with the products formed 110A of through hole 114B and the polygonal mirror 110 without through hole 114B the stage in molding procedure, also can omit perforate operation.
Then, at the reflectance coating (evaporation operation) such as surperficial vapor deposition treatment aluminium of products formed 110A, produce polygonal mirror 110 (with reference to Fig. 4 (c)) thus.
According to the above, action effect as described below can be obtained in the present embodiment.
In the part corresponding with recess 114 of polygonal mirror 110, its wall thickness is less than part in addition, and the mobility of resin when therefore existing shaping is deteriorated and makes the possibility that the processability of polygonal mirror 110 is deteriorated.
But in the present embodiment, utilize protuberance 115 to make polygonal mirror 110 reduce at the variable quantity of wall thickness of the section comprising turning axle 121, therefore compared with the structure not having protuberance, the mobility of resin when can make shaping improves.Therefore, it is possible to improve the processability of polygonal mirror 110.
Profile due to recess 114 and protuberance 115 is circular, and compared with not therefore being circular structure with the profile of recess and protuberance, the mobility of resin when can make shaping improves.Further, easily products formed 110A can be taken out from mould 140 after resin forming.
At this, if the diameter of the profile of protuberance is less than the diameter of the profile of recess, then there is the less part of wall thickness in the junction of the part not corresponding with protuberance in recess, likely causes the mobility of resin to be deteriorated.But, in the present embodiment, the part that such wall thickness is less can not be there is, therefore, it is possible to the mobility of resin when making shaping improves.
Polygonal mirror 110 is only pressed by pressing component 130 at the first teat 116, and therefore the pressure of pressing component 130 is not easily delivered to the part of protuberance 115, can suppress this portion deforms.
Owing to ensure that the amount of recess of the recess 114 be fitted together to for rotor protuberance 122B fully, therefore polygonal mirror 110 not easily offsets on direction orthogonal to the axial direction.Therefore, can easily position polygonal mirror 110 in the direction in which.Further, by guaranteeing the amount of recess of recess 114, the volume of products formed 110A can be reduced, cost can be realized and reduce.
In addition, in the present embodiment, resin by injection in mould 140 also offers through hole 114B after taking out products formed 110A, therefore, it is possible to carry out shaping under the state of the wall thickness at the position of maintenance through hole 114B.Therefore, it is possible to the mobility of resin when making shaping improves, the processability of polygonal mirror 110 can be improved.
Further, owing to utilizing drill bit to process through hole 114B, therefore, it is possible to offer through hole 114B by simple method.
Further, because joint face 113 is level and smooth curve forms, therefore, it is possible to make reducing from mould resistance when taking out products formed 110A from mould 140 after resin forming, the processability of polygonal mirror 110 can be improved.
Above embodiments of the present invention are illustrated, but the invention is not restricted to above-mentioned embodiment.Can suitably change concrete structure without departing from the scope of the subject in the invention.
In the above-described embodiment, joint face 113 is formed as the curved surface with a barrel surface, but the present invention is not limited thereto, such as, also can be, is made up of as Suo Shi Fig. 9 (a) the curved surface with two barrel surface.
Joint face 213 in this structure radius-of-curvature be configured near the side of the second reflecting surface 111B is less than the radius-of-curvature of the side near the first reflecting surface 111A, and joint face 213 has the barrel surface of radius of curvature R 1 and the barrel surface i.e. second curved surface 213B of first surface 213A and the radius of curvature R 2 less than radius of curvature R 1.Further, joint face 213 is configured to the circular arc curve continuously that makes radius different from end on observation.Thus, the first reflecting surface 111A is connected smoothly with the second reflecting surface 111B, therefore, it is possible to easily take out products formed 110A from the second mould 142.
In addition, also can be that, as shown in Fig. 9 (b), joint face 313 is made up of plane, and non-curved.In such an embodiment, the shape being approximate right angle with the first reflecting surface 111A and the coupling part of the second reflecting surface 111B is compared, and this coupling part also can be made to be formed smoothly.Further, in the structure of Fig. 9 (a), (b), identical with above-mentioned embodiment, form the joint face 213,313 making the relation meeting D1>D2.
In the above-described embodiment, polygonal mirror 110 has the bottom surface of roughly square shape, but the present invention is not limited thereto, such as, also can be, has the bottom surface (first surface 412A) of regular pentagon shape as shown in Figure 10 (a).
The polygonal mirror 410 of this structure has multiple (five) first teat 416, and the plurality of first teat 416 has the shape identical with above-mentioned embodiment, and gives prominence to from first surface 412A.First teat 416 is arranged on each line of the center P (center of first surface 412A) connecting each summit of first surface 412A and the turning axle 121 of motor 120, and is respectively X1 with the distance of this center P and equal.That is, each first teat 416 can be made mutually the same relative to the position relationship on close summit.
In addition, also can be that there is the bottom surface (first surface 612A) of regular hexagon shape as shown in Figure 10 (b).
The polygonal mirror 610 of this structure has from outstanding multiple (six) of first surface 612A first teat 616.First teat 616 is arranged on each line of the center P connecting each summit of first surface 612A and the turning axle 121 of motor 120, and is respectively X2 with the distance of this center P and equal.
Being provided with multiple first teat 116 in the above-described embodiment, but the present invention is not limited thereto, such as, also can be that polygonal mirror 510 is as shown in figure 11 configured to circular first teat 516 like that.
First teat 516 from first surface 512A be mesa-shaped give prominence to, its end face is formed as the plane parallel with first surface 512A.First teat 516 extends configuration along the profile of protuberance 115 with constant width in the outside of protuberance 115.On the other hand, the part that each line that the pressing component (omit and illustrate) abutted with the first teat 516 is configured in the center P being connected each summit of first surface 512A and the turning axle 121 of motor 120 respectively intersects with the first teat 516, the fore-end contacted with the first teat 516 is formed as with the circle shown in double dot dash line.That is, the pressed portion 516A in polygonal mirror 510 should be become with the scope shown in double dot dash line.In this fashion, each pressed portion 516A also can be made mutually the same relative to the position relationship on close summit.
In addition, in the mode of Figure 11, also can be that the section on the surface of the first teat 516 is configured to semicircle shape.Further, if pressing component is configured to the position corresponding with pressed portion 516A pressing first surface 512A, then the first teat 516 also can not be set.
In addition, the shapes of polygonal mirror 110 such as joint face 113, first teat 116, second teat 117 in the respective embodiments described above and the form etc. of light deviator 100 also suitably can change according to use-pattern.
In the respective embodiments described above, as the laser printer 1 of image processing system exemplified with monochrome, but the present invention is not limited thereto, such as, also can be other image processing system such as color printer and equipment complex.
Claims (14)
1. a polygonal mirror, is formed by resin forming, comprising: multiple reflecting surface; First surface, it is the face of the side intersected with described multiple reflecting surface; And second, it is the face of the opposite side intersected with described multiple reflecting surface, and the feature of described polygonal mirror is, comprising:
Recess, at the central portion of described second from described second depression; And
Protuberance, gives prominence to from described first surface, from observing overlapping with described recess with described second orthogonal direction.
2. polygonal mirror according to claim 1, is characterized in that,
The profile of described recess is circular.
3. polygonal mirror according to claim 2, is characterized in that,
The profile of described protuberance is circular.
4. polygonal mirror according to claim 3, is characterized in that,
The diameter of the profile of described protuberance is the size of more than the diameter of the profile of described recess.
5. polygonal mirror according to claim 1, is characterized in that,
Described polygonal mirror has the through hole that the central authorities in the bottom surface of described recess are formed.
6. polygonal mirror according to claim 1, is characterized in that,
Described polygonal mirror has the teat outstanding from described first surface in the outside of described protuberance.
7. polygonal mirror according to claim 6, is characterized in that,
Described teat is greater than the overhang of described protuberance from described first surface from the overhang of described first surface.
8. the polygonal mirror according to any one in claim 1 ~ 7, is characterized in that,
Described recess is greater than the overhang of described protuberance from described first surface from the amount of recess of described second.
9. the polygonal mirror according to any one in claim 1 ~ 7, is characterized in that,
Described recess is the over half of distance between described first surface and described second from the amount of recess of described second.
10. a light scanning apparatus, is characterized in that, comprising:
Light source, outgoing beam;
Polygonal mirror, formed by resin forming, the face of the side comprise multiple reflecting surface, intersecting with described multiple reflecting surface and first surface and that is second, the face of opposite side intersected with described multiple reflecting surface, described polygonal mirror has at the central portion of described second from the recess of described second depression and give prominence to from described first surface and observe the protuberance overlapping with described recess from described second orthogonal direction;
Motor, is embedded in described recess; And
Scanning optics, for the light beam imaging of will be reflected by described polygonal mirror.
11. 1 kinds of image processing systems, is characterized in that, comprising:
Light source, outgoing beam;
Polygonal mirror, formed by resin forming, the face of the side comprise multiple reflecting surface, intersecting with described multiple reflecting surface and first surface and that is second, the face of opposite side intersected with described multiple reflecting surface, described polygonal mirror has at the central portion of described second from the recess of described second depression and give prominence to from described first surface and observe the protuberance overlapping with described recess from described second orthogonal direction;
Motor, is embedded in described recess;
Scanning optics, for the light beam that will be reflected by described polygonal mirror in photoreceptor imaging; And
Developing apparatus, to described photoreceptor supply developer.
The manufacture method of 12. 1 kinds of polygonal mirrors, this polygonal mirror comprises: multiple reflecting surface; First surface, it is the face of the side intersected with described multiple reflecting surface; Second, it is the face of the opposite side intersected with described multiple reflecting surface; Recess, at the central portion of described second from described second depression; And protuberance, from described second outstanding, observe overlapping with described recess from the direction orthogonal with described first surface,
The feature of the manufacture method of described polygonal mirror is, comprises following operation:
Preparatory process, prepare mould, this mould has the cavity corresponding with the shape of described polygonal mirror, and possesses the cast gate for resin by injection in the position corresponding with the central authorities of described protuberance; And
Molding procedure, carries out shaping from described cast gate resin by injection.
The manufacture method of 13. 1 kinds of polygonal mirrors, this polygonal mirror comprises: multiple reflecting surface; First surface, it is the face of the side intersected with described multiple reflecting surface; Second, it is the face of the opposite side intersected with described multiple reflecting surface,
The feature of the manufacture method of described polygonal mirror is, comprises following operation:
Preparatory process, prepare mould, this mould has the cavity corresponding with the shape of described polygonal mirror, and possesses the cast gate for resin by injection in the position corresponding with the central authorities of described first surface;
Molding procedure, carries out shaping from described cast gate resin by injection; And
Perforate operation, offers through hole in the position corresponding with described cast gate.
The manufacture method of 14. polygonal mirrors according to claim 13, is characterized in that,
Drill bit is utilized to process described through hole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014024042A JP6364803B2 (en) | 2014-02-12 | 2014-02-12 | Polygon mirror, optical scanning device, image forming apparatus, and polygon mirror manufacturing method |
| JP2014-024042 | 2014-02-12 |
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| CN104834087A true CN104834087A (en) | 2015-08-12 |
| CN104834087B CN104834087B (en) | 2019-07-23 |
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| CN201510076679.7A Active CN104834087B (en) | 2014-02-12 | 2015-02-12 | The manufacturing method of polygonal mirror, light scanning apparatus, image forming apparatus and polygonal mirror |
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| CN (1) | CN104834087B (en) |
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|---|---|---|---|---|
| CN105974555A (en) * | 2016-07-22 | 2016-09-28 | 武汉海达数云技术有限公司 | Three-dimensional laser scanner metal prism and installation shaft and three-dimensional laser scanner |
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| CN112226741A (en) * | 2020-09-25 | 2021-01-15 | 山东国晶新材料有限公司 | High-yield production device and method for boron nitride plate |
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| KR101720773B1 (en) * | 2010-08-30 | 2017-03-28 | 에스프린팅솔루션 주식회사 | Rotational polygon mirror and light scanning unit employing the same |
| KR101760344B1 (en) * | 2010-11-24 | 2017-07-21 | 에스프린팅솔루션 주식회사 | Polygonal mirror accembly, light scanning unit employing the polygonal mirror accembly and image forming apparatus |
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| CN105974555A (en) * | 2016-07-22 | 2016-09-28 | 武汉海达数云技术有限公司 | Three-dimensional laser scanner metal prism and installation shaft and three-dimensional laser scanner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6364803B2 (en) | 2018-08-01 |
| CN104834087B (en) | 2019-07-23 |
| JP2015152653A (en) | 2015-08-24 |
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