CN1752871A - Optical discharge apparatus and image forming apparatus containing the same - Google Patents
Optical discharge apparatus and image forming apparatus containing the same Download PDFInfo
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- CN1752871A CN1752871A CN 200510106811 CN200510106811A CN1752871A CN 1752871 A CN1752871 A CN 1752871A CN 200510106811 CN200510106811 CN 200510106811 CN 200510106811 A CN200510106811 A CN 200510106811A CN 1752871 A CN1752871 A CN 1752871A
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Abstract
In an optical discharge apparatus used in an electrographic image forming apparatus, by forming, on a light guiding member, a diffusing reflecting face for reflecting light from an LED lamp towards a photosensitive drum, and by supplementing the amount of light by altering the height of the diffusing reflecting face to the light emitting face and the width of the diffusing reflecting face in accordance with their distance from the light source, the light intensity distribution of the irradiating light that is irradiated onto the photosensitive drum is made uniform. Furthermore, since light that leaks from the diffusing reflecting face is reflected by a reflecting film that is pasted onto an upper face in the vicinity of a rear end portion of the light guiding member, and returned to the interior of the light guiding member, the amount of light that is irradiated from the light emitting face in the vicinity of the rear end portion of the light guiding member increases, and thus it is possible to further increase the uniformity of the light intensity distribution of the irradiating light. Furthermore, an optical discharge apparatus used in an electrographic image forming apparatus is provided with a light guiding member that is arranged facing the photosensitive drum of the image forming apparatus, and an LED lamp for irradiating the light onto the light incident face of the light guiding member. A diffusing reflecting face for reflecting the light from the LED lamp toward the photosensitive drum is formed on the light guiding member. The rear end face of the light guiding member is an optically transparent face, and the amount of irradiating light that is irradiated onto the photosensitive drum from the vicinity of the rear end portion of the light guiding member increases by forming a reflecting face behind the rear end face of the light guiding member.
Description
The application's request based on September 22nd, 2004 spy in Japanese publication be willing to 2004-275713 number, and on October 13rd, 2004 spy in Japanese publication be willing to 2004-299329 number right of priority.Therefore all the elements of above-mentioned application comprise in this application.
Technical field
The present invention relates to a kind of image in the electrofax mode and form and handle, remove by rayed photoreceptor residual charge optical discharge apparatus and have the image processing systems such as duplicating machine of this device.
Background technology
As the image processing system of electrofax modes such as duplicating machine, comprise that the monochrome image that forms black white image forms device, reaches the coloured image formation device that forms coloured image.Forming device as coloured image comprises: the image processing system of many rotation modes is formed on the single photoreceptor successively via the toner image forming device of shades of colour (black, cyan, magenta, the Huang) toner image with each composition color; The image processing system of tandem moor, along intermediate transfer material arranged in series, above-mentioned a plurality of toner image forming devices roughly are formed on the toner image of each color component on each photoreceptor respectively simultaneously with a plurality of toner image forming devices.
The image processing system of this electrofax mode is the device that forms image by various processing such as charged, exposure, development, transfer printing, photographic fixing, for example when device is duplicating machine, following carry out described each handle.
At first, on the surface of the photoreceptor (photosensitive drums) that has been endowed even electric charge by charged charger, expose via the reflected light of optical system to original image, thereby make electrostatic latent image, toner (developer) electrostatic adhesion to this electrostatic latent image and make it to develop, is formed toner image on photoreceptor.Then, apply and the opposite polarity static of toner image, toner image be transferred on the recording chart to transfer article, by heating, pressurization with the toner image photographic fixing of transfer printing, and image immobilization that will be corresponding on recording chart with original image.
In the basic structure of the duplicating machine that as above constitutes, a plurality of functional imperative that are intended to improve picture quality and copy image formation efficient have been added.For example, the optical discharge apparatus of removing the electric charge on the photoreceptor by rayed promptly is equivalent to this key element.For example comprise as optical discharge apparatus: the eraser of before development treatment, wiping the not good latent image of non-image areas on the photoreceptor; Reduce the preceding electric light (PTL) that removes of transfer printing of the current potential on the preceding photoreceptor of transfer process optically; Remove electric light (QL) etc. what remove residual charge on the photoreceptor after the cleaning.
As the illumination light source of this optical discharge apparatus, use discharge tubes such as fluorescent tube.And, as shown in figure 29, using led array 500, this led array 500 is arranged with a plurality of led chips 502 on substrate 501.Particularly in the last few years, owing to the demand that has occurred the product of miniaturization, low price, therefore utilized the product of led array 500 more and more.
Led array 500 by arranging led chip (LED lamp) 502 thick and fast, with respect to the surface as illuminated photosensitive drums 401, can substantially obtain the higher illuminance of homogenising as shown in figure 30.
But in this structure,, therefore on cost, be difficult to realize low price because the number of employed led chip 502 is more.And in order to realize low cost, and when reducing the use number of led chip 502, it is big that the interval between the led chip 502 becomes, on the illuminance of photosensitive drums 401 distributes, produce uneven, thereby can't obtain uniform illuminance.
As the technology that addresses this is that, lighting device as follows (for example opening flat 08-043633 communique with reference to the spy) is disclosed: have light conductor, and be provided with light source in the end of this light conductor, above-mentioned light conductor has: photoirradiated surface, utilization is set on the side surface part alongst by the columnar part that translucent material constitutes; The light diffusion part is set on the face relative with this photoirradiated surface, and utilizes cut or asperities to process leaded light.
And also proposed light as follows and removed electrical equipment (for example opening 2002-278395 communique 2 with reference to the spy): have: pointolite is set on the image processing system main body; Light conductor is carried on the handle box (processcartridge) that can be installed on the image processing system main body with freely loading and unloading, will be directed on the photoreceptor from the light of pointolite.
But, according to the described structure of above-mentioned each patent documentation, light is being shone from light conductor the zone of photosensitive drums, still there is following problem:, less in area illumination light quantity away from light source more near irradiation light quantity in the zone of light source.And, on the length direction of this photosensitive drums, when having inequality on the irradiation light quantity distribution, the image inequality can appear, can't obtain preferable image.Particularly near the rearward end of light source light conductor farthest, the decline degree of irradiation light quantity is bigger, need make moderate progress to this.
Summary of the invention
The present invention proposes just in view of the above problems, it is a kind of in the image processing system of electrofax mode that its purpose is to provide, can make the comparatively uniform optical discharge apparatus of light quantity distribution of the irradiates light that shines to photoreceptor for the electric charge of removing photoreceptor, and a kind of image processing system with the optical discharge apparatus that has possessed above-mentioned feature is provided.
Optical discharge apparatus of the present invention, be used for removing the electric charge of photoreceptor at the image processing system of electrofax mode, it is characterized in that: have the light conductor that is oppositely arranged with above-mentioned photoreceptor, reach light source to the light entrance face irradiates light of this light conductor, in above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, this diffusely reflecting surface is with respect to the height of the light emergence face of the above-mentioned photoreceptor of this light conductor, and the width (length of the direction vertical) of this diffusely reflecting surface with the length direction of photoreceptor, change near the upper surface configuration reflection part the terminal part of above-mentioned light conductor according to distance apart from above-mentioned light source.
According to optical discharge apparatus of the present invention, have that formed will be from the light of the light source light conductor towards the diffusely reflecting surface of photoreceptor reflection, the diffusely reflecting surface of this light conductor is with respect to the height of the light emergence face of photoreceptor, and the width of this diffusely reflecting surface, distance according to the distance light source changes, and therefore can make the light quantity distribution of the irradiates light that shines photoreceptor comparatively even.
And, near the upper surface configuration reflection part terminal part of light conductor, therefore can make by reflection of light near the light quantity that shines the irradiates light on the photoreceptor light conductor terminal part to increase, and can make the light quantity distribution of irradiates light more even by this reflection part.
And, optical discharge apparatus of the present invention, be used for removing the electric charge of photoreceptor at the image processing system of electrofax mode, it is characterized in that: have the light conductor that is oppositely arranged with above-mentioned photoreceptor, reach light source to the light entrance face irradiates light of this light conductor, in above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, this diffusely reflecting surface is with respect to the height of the light emergence face of the above-mentioned photoreceptor of this light conductor, and the width of this diffusely reflecting surface, change according to the distance apart from above-mentioned light source, near the upper surface the terminal part of above-mentioned light conductor forms the groove that traverses this light conductor.
According to optical discharge apparatus of the present invention, have that formed will be from the light of the light source light conductor towards the diffusely reflecting surface of photoreceptor reflection, the diffusely reflecting surface of this light conductor with respect to the height of the light emergence face of photoreceptor, and the width of this diffusely reflecting surface change according to the distance of distance light source, therefore can make the light quantity distribution of the irradiates light that shines photoreceptor comparatively even.
And, because near the upper surface the terminal part of light conductor forms the groove that traverses this light conductor, therefore by reflection of light at this groove inner face, can increase from shining the light quantity of the irradiates light of photoreceptor near the terminal part of light conductor, thereby can further make the light quantity distribution of irradiates light even.
In said structure, also can be near the terminal part of above-mentioned light conductor upper surface and traverse the inner face configuration reflection part of the groove of this light conductor.
As mentioned above, near if upper surface and traverse the inner face configuration reflection part of the groove of this light conductor terminal part of above-mentioned light conductor, then can increase light quantity, thereby can improve the homogenising of the light quantity distribution of irradiates light near the irradiates light the terminal part of light conductor.
Further, optical discharge apparatus of the present invention, be used for removing the electric charge of photoreceptor at the image processing system of electrofax mode, it is characterized in that: have the light conductor that is oppositely arranged with above-mentioned photoreceptor, reach light source to the light entrance face irradiates light of this light conductor, in above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, this diffusely reflecting surface is with respect to the height of the light emergence face of the above-mentioned photoreceptor of this light conductor, and the width of this diffusely reflecting surface, change according to the distance apart from above-mentioned light source, the terminal part of above-mentioned light conductor has precipitous dip plane.
According to optical discharge apparatus of the present invention, have that formed will be from the light of the light source light conductor towards the diffusely reflecting surface of photoreceptor reflection, on above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, this diffusely reflecting surface is with respect to the height of the light emergence face of above-mentioned photoreceptor, and the width of this diffusely reflecting surface, distance according to the distance light source changes, and therefore can make the light quantity distribution of the irradiates light that shines photoreceptor comparatively even.
And, because the terminal part of light conductor has precipitous dip plane, therefore by the reflection of light of this precipitous dip plane, can increase from shining the light quantity of the irradiates light of photoreceptor near the terminal part of light conductor, thereby can further make the light quantity distribution of irradiates light even.
And, in said structure, also can near upper surface the terminal part of above-mentioned light conductor and above-mentioned precipitous dip plane, dispose reflection part.
In this case, if near upper surface the terminal part of light conductor and precipitous dip plane, dispose reflection part, then can increase light quantity, thereby can improve the homogenising of the light quantity distribution of irradiates light near the irradiates light the terminal part of light conductor.
And in said structure, above-mentioned light conductor is turned back, and at the place of turning back of this light conductor, is provided with the reflecting surface of the light path bending that is used to make this light conductor.
In this case, because light conductor turned back, be provided with the reflecting surface of the light path bending that is used to make this light conductor at the light conductor place of turning back, so can increase the optical path length of charge removing area, and need not to increase the length of light conductor at optical axis direction.Consequently can realize the miniaturization of image processing system.
And, optical discharge apparatus of the present invention, be used for removing the electric charge of photoreceptor at the image processing system of electrofax mode, it is characterized in that: have the light conductor that is oppositely arranged with above-mentioned photoreceptor, and to the light source of the light entrance face irradiates light of this light conductor, in above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, and the rear end face of this light conductor becomes transparent surface, at the rear of the rear end face of this light conductor configuration reflecting surface.
According to optical discharge apparatus of the present invention, since with the rear end face of light conductor as transparent surface, at the rear of the rear end face of this light conductor configuration reflecting surface, therefore the light that sees through the rear end face of light conductor can be reflected towards light conductor, by the reflection of light effect of being undertaken, can increase from shining the light quantity of the irradiates light of photoreceptor near the rearward end of light conductor by this reflecting surface.Consequently can make the further homogenising of the light quantity distribution that shines the irradiates light on the photoreceptor.
At this, method as near the irradiation light quantity the rearward end that improves light conductor, be included in the direct bonding zone of reflections of rear end face of light conductor, perhaps rear end face is implemented methods such as aluminium-vapour deposition, but in these methods, because light conductor is long object, exists carrying out the bonding and aluminium-vapour deposition of the zone of reflections etc. and add the relatively poor problem of its operation in man-hour.And, also exist the rear end face of light conductor the surface state inequality, and owing to there is the articulamentum of rear end face the lower problem of reflectivity.Relative with it, in the present invention, under released state, reflecting surface is configured to the rear at the rear end face of light conductor, thereby need not light conductor self is processed, so operation is better.Further, by reflecting surface is separated from light conductor, can be not by about the surface state of the rear end face of light conductor institute, to guarantee higher reflectivity.
And, in said structure, also can be on the support unit of the rearward end that supports above-mentioned light conductor, integrally formed reflection part with above-mentioned reflecting surface.
When adopting this structure, can make the position relation between the reflecting surface at the rear end face of light conductor and its rear keep constant, therefore can guarantee not have the stable reflection that fluctuates.And,, can reduce the accessory number by reflection part is integrally formed on the support unit.
And, in said structure, be configured in the reflecting surface at rear of the rear end face of light conductor, for example can form by the metallic film of metal evaporation.And, in this case, can use aluminium, but, preferably use nickel, chromium, nickel-chromium alloy or gold from the angle of the corrosion resistance of ozone that charged device etc. is generated as the material of metallic film.
And in said structure, preferably, the diffusely reflecting surface of light conductor is its height with respect to the light emergence face of the photoreceptor of this light conductor, and the shape that changes according to the distance of distance light source of the width of this diffusely reflecting surface.So, the diffusely reflecting surface that makes light conductor is with respect to the height of the light emergence face of photoreceptor and the width of this diffusely reflecting surface, distance according to the distance light source changes, and carries out light quantity and proofread and correct, thereby can the light quantity distribution of irradiates light that shine photoreceptor is comparatively even.
And, in said structure, can be by pasting reflectance coating (for example polycarbonate membrane+nickel evaporation) to the opposite face (comprising the face that contacts with rear end face) relative with the rear end face of the light conductor of the integrally formed live part of above-mentioned support unit, rear end face rear at light conductor forms reflecting surface, also can form reflecting surface (metallic film) by to metals such as the direct evaporation nickel of the opposite face of above-mentioned support unit, chromium, nickel-chromium alloy or gold.And, when reflection part is made of metal, form reflecting surface thereby also can implement mirror finish to the opposite face relative with the rear end face of light conductor.
Image processing system of the present invention is characterised in that to have the optical discharge apparatus that has possessed above-mentioned feature.
And, in said structure,, when having the corona charging device, can above-mentioned light conductor be bearing on the casing of this corona charging device via support unit as making the charged charged device of photosensitive surface.
By the structure on this casing that light conductor is bearing in the corona charging device, can dwindle the space that is provided with of light conductor.Particularly when image processing system is colored tandem, in the prior art, the space (taking up room) that is provided with of light conductor is to hinder a factor that realizes miniaturization, but when on the casing that light conductor is bearing in the corona charging device, in the image forming part corresponding (image station) with each color, can reduce the space that is provided with of light conductor respectively, therefore device can be realized miniaturization largely on the whole.
And in said structure, also can be provided with the peristome that is used to deflate on the casing of above-mentioned corona charging device, above-mentioned light conductor is supported in than on the high position of this peristome.
In this case, can prevent of the harmful effect of the ozone of generation in the charged device casing to light conductor.Promptly, because corona removes the electric ozone that is generated and is discharged to the below by own wt by peristome, therefore by light conductor being configured in the position higher, can prevent the diffusely reflecting surface of light conductor and the reflecting surface of reflection part etc. because ozone and deterioration (corrosion etc.) than the peristome of casing.
And, in this case, also exhaust equipments such as gas outlet and vent fan can be set, be used to discharge the interior ozone that generates of the casing that is included in the corona charging device at interior air, thereby will comprise the force air discharge of ozone.
And, image processing system of the present invention, the image forming part tandem that will contain each photoreceptor is arranged, and it is characterized in that the optical discharge apparatus of the invention described above is separately positioned on above-mentioned each photoreceptor.
As mentioned above, according to image processing system of the present invention, on the photoreceptor of each image forming part that tandem is arranged, be respectively equipped with optical discharge apparatus with above-mentioned feature.In order to make this image processing system miniaturization, need make each image forming part miniaturization, therefore, preferably use small-sized material as the optical discharge apparatus of each image forming part.Optical discharge apparatus with above-mentioned feature is by the light conductor of relative configuration with photoreceptor, and to the simple structure that the light source of the light entrance face irradiates light of this light conductor constitutes, therefore can realizes miniaturization.So each image forming part also can be realized miniaturization, help realizing the miniaturization of image processing system.
As mentioned above, according to image processing system of the present invention,, therefore can obtain preferable image owing to have optical discharge apparatus of the present invention.
Description of drawings
Fig. 1 is the figure of the structure of the image processing system that relates to of expression embodiment of the present invention 1.
Fig. 2 is the figure of the structure of employed image formation unit in the image processing system of presentation graphs 1.
Fig. 3 is the skeleton view of the major part structure of the optical discharge apparatus that relates to of embodiments of the present invention 1.
Fig. 4 is the side view (A) of the optical discharge apparatus of presentation graphs 3 simultaneously and the figure of vertical view (B).
Fig. 5 is the state that expression is installed to the optical discharge apparatus of Fig. 3 image processing system.
Fig. 6 is the side view (A) of the optical discharge apparatus of representing that simultaneously embodiments of the present invention 2 relate to and the figure of vertical view (B).
Fig. 7 will amplify the side view of expression near the rear end of the light conductor of Fig. 6.
Fig. 8 is the side view of the optical discharge apparatus that relates to of expression embodiments of the present invention 3.
Fig. 9 will amplify the side view of expression near the rear end of the light conductor of Fig. 8.
Figure 10 is the side view (A) of the optical discharge apparatus of representing that simultaneously embodiments of the present invention 4 relate to and the figure of vertical view (B).
Figure 11 is that the D-D of Figure 10 is to view.
Figure 12 is the brief configuration figure of the image processing system that relates to of expression embodiments of the present invention 5.
Figure 13 is the figure that the side view (A) that will schematically represent the optical discharge apparatus that embodiments of the present invention 5 relate to and ground plan (B) are represented simultaneously.
Figure 14 is the side view of employed light conductor in the optical discharge apparatus of Figure 13.
Figure 15 is the skeleton view that expression is installed to the optical discharge apparatus of Figure 13 the state on the corona charging device.
Figure 16 is the side view that expression is installed to the optical discharge apparatus of Figure 13 the state on the corona charging device.
Figure 17 is the M-M sectional view of Figure 16.
Figure 18 is the N-N sectional view of Figure 16.
Figure 19 is the figure of structure that schematically represents the forced exhaust mechanism of corona charging device.
Figure 20 is the key diagram of embodiments of the invention.
Figure 21 is at comparative example 1 and embodiment 1 to 5, near the side view the rearward end of each light conductor of schematic representation.
Figure 22 is the key diagram of angle of the face of light conductor rearward end.
Figure 23 is at comparative example 1 and embodiment 1 to 5, represents near the chart of the situation the rearward end of each light conductor.
Figure 24 is at embodiments of the invention 1 to 5, and the result's of each light intensity distributions chart is measured in expression.
Figure 25 is the chart that the light intensity distributions characteristic standardization of Figure 24 is represented.
Figure 26 is at comparative example 1 and embodiment 1 to 5, is illustrated in the bar chart apart near the light intensity each LED300mm.
Figure 27 represents the structure of light intensity distributions measuring system, and the configuration of expression LED lamp and tester.
Figure 28 is at embodiments of the invention and comparative example, the result's that the expression measured light intensity distributes chart.
Figure 29 is the skeleton view of the structure of employed led array in the existing optical discharge apparatus of expression.
Figure 30 is the side view of the structure of the existing optical discharge apparatus of expression.
Embodiment
Below with reference to the accompanying drawings embodiments of the present invention are described.
(embodiment 1)
-image processing system-
Fig. 1 is the figure of the image processing system that relates to of expression embodiments of the present invention 1.
Read corresponding original image the original copy of image reading unit 1101 on being placed on original copy mounting table 1105 one by one successively.RADF 1106, and the original copy that is placed in the predetermined original tray one by one is sent to original copy mounting table 1105, and after optical system unit 1110 finishes reading of image, are sent to predetermined extracting position.
The original image reading unit that optical system unit 1110 reads according to each predetermined unit on scan-line direction as the original image that will be sent on the original copy mounting table 1105 and constituting.Optical system unit 1110 comprises: the first catoptron base portion 1111, the second catoptron base portion 1112, optical lens 1117, and photo-electric conversion element (following CCD) 1118.
The first catoptron base portion 1111, have lamp reflector assembly 1113 that is used for irradiates light and first catoptron 1114 that will be directed to the following second catoptron base portion 1112 from the reflected light of original copy, move with constant speed V from left to right in same figure along original copy mounting table 1105, simultaneously to the original copy irradiates light.
The second catoptron base portion 1112, have second catoptron 1115 and the 3rd catoptron 1116 that will be directed to optical lens 1117 and CCD 1118 directions from the light of the first catoptron base portion 1111, it follows the action of the first catoptron base portion 1111, moves with the speed of V/2.
In the downstream of image formation unit 1120 and fixing device 1107 side, have: in order to make revolution transfer path 1136, the lifting disk 1141 of paper counter-rotating at the two-sided formation image of paper, and dispose the after-treatment device 1104 of the paper that finish image fixing being implemented bookbinding processing etc.
-optical discharge apparatus-
Then the optical discharge apparatus 110 that embodiments of the present invention 1 are related to describes.
On the light conductor 112, form: become the leaded light path X1 of portion, constitute the reflecting part X2 and the reflecting part X3 of charge removing area from the leaded light path of the light of LED lamp 111.
Reflecting part X2 is processed into light emergence face 112b and its back side 112d parallel in shape.Reflecting part X3 is processed into the shape that 112d relative light emergence face 112b in the back side tilts, and is the shape along with the close light emergence face 112b of rear end face 112e, back side 112d of close light conductor 112.
And, the back side 112d of light conductor 112, in the zone corresponding with reflecting part X2 and reflecting part X3, diffusely reflecting surface (prism) 112c that formation will be reflected towards photosensitive drums 11 from the light of LED lamp 111.This diffusely reflecting surface 112c is with respect to the height H of light emergence face 112b, and is constant in reflecting part X2.And the diffusely reflecting surface 112c among the reflecting part X3 diminishes along with the rearward end (the rear end face 112e of light conductor 112) of close reflecting part X3 with respect to the height H of light emergence face 112b.Further, the width W of diffusely reflecting surface 112c (length of the direction vertical with the direction of principal axis of photosensitive drums 11) is not constant, shown in Fig. 4 (B), form following pattern: begin to reflecting part X3 from the end of the light inlet side of reflecting part X2, width diminishes gradually, from reflecting part X2 midway to the rearward end (the rear end face 112e of light conductor 112) of reflecting part X3, it is big that width becomes gradually.
And, near the rearward end of light conductor 112, paste the reflectance coating 113 carried out aluminium-vapour deposition etc. to diffusely reflecting surface 112c.In diffusely reflecting surface 112c,, the light transmission of small part is arranged and leak into the outside though almost all be reflected by this prism facets light.Reflectance coating 113 reflects these light that leak out from diffusely reflecting surface 112c, and this reflected light is turned back to light conductor 112 inside via diffusely reflecting surface 112c.
As mentioned above, in the light conductor 112 among this embodiment, will be from the light of LED lamp 111 towards the diffusely reflecting surface 112c of photosensitive drums 11 reflections height H (length of Y direction) with respect to light emergence face 112b, change according to position (position of directions X) with respect to LED lamp 111, and, the width W of diffusely reflecting surface 112c is also according to changing with respect to the position (position of directions X) of LED lamp 111, therefore can make the light intensity distributions homogenising of the irradiates light that shines photosensitive drums 11 in the Zone Full of the direction of principal axis (length direction) of photosensitive drums 11.
And, near the rearward end of light conductor 112, reflectance coating 113 is pasted diffusely reflecting surface 112c, the light that leaks from diffusely reflecting surface 112c by 113 reflections of this reflectance coating also makes it turn back to light conductor 112 inside, therefore near the light quantity from the irradiates light of light emergence face 112b the rearward end of light conductor 112 increases, and can further make the light quantity distribution homogenising of irradiates light.
Consequently, can obtain the image of fine quality that do not have image unequal.
Employed light conductor 112 in this routine optical discharge apparatus 110, all surface all is level and smooth faces except diffusely reflecting surface 112c, the last formation of above-mentioned diffusely reflecting surface 112c prism facets etc. are concavo-convex.Light conductor 112 is by being shaped transparent materials such as acrylic resin, polycarbonate resin, polystyrene resin, vestolit or glass with injection molding method or extrusion, and grinds as required to wait and handle and manufacturing.Perhaps, also all surface of light conductor 112 can be made even surface,, and near the rearward end of light conductor 112, reflectance coating 113 overlapping pasting on the diffusion zone be made only to pasting the diffusion zone of gonorrhoea as the part of diffusely reflecting surface 112c.
In addition, enumerated the image processing system that forms monochrome image by an image forming part 1102 here, also above-mentioned optical discharge apparatus 110 can be applied to coloured image and form device.Form in the device at coloured image, according to colour types such as black, magenta, cyan, yellow, each image forming part tandem is arranged, by each image forming part the image of each color is directly overlapped on the recording chart and to form, perhaps versicolor image is overlapped onto on the recording chart via intermediate transfer belt and form.For this coloured image is formed equipment miniaturization, need be with each image forming part miniaturization, therefore as the optical discharge apparatus of each image forming part, the advantageous applications small parts.Above-mentioned optical discharge apparatus 110 is by with the light conductor 112 of photosensitive drums 11 relative configurations and light shine the simple structure that the LED lamp 111 of the light entrance face of this light conductor 112 constitutes, and therefore can realize miniaturization.Therefore, each image forming part also can be realized miniaturization, thereby helps to realize that coloured image forms the miniaturization of device.
(embodiment 2)
The optical discharge apparatus that embodiments of the present invention 2 relate to is as Fig. 6 (A) and (B).
This optical discharge apparatus 1210 has: configuration relative with photosensitive drums 11 (with reference to Fig. 3) 1212, and to the LED lamp 111 of the light entrance face 1212a of this light conductor 1212 irradiates light.
The major part of the back side 1212d of light conductor 1212 is the dip plane, forms diffusely reflecting surface (prism facets) 1212c on this dip plane, and this diffusely reflecting surface is used for the light from LED lamp 111 is reflected towards photosensitive drums 11.
The diffusely reflecting surface 1212c of light conductor 1212 is with respect to the height H of light emergence face 1212b, and the width W (length of the direction vertical with the direction of principal axis of photosensitive drums 11) of this diffusely reflecting surface 1212c, according to the distance of distance led light source 111, diminish with certain ratio along with the rear end face 1212e of close light conductor 1212.
And, shown in the amplification among Fig. 7 shows, near the rearward end of light conductor 1212, form the V-groove 1212f that traverses this light conductor 1212, near the rearward end of light conductor 1212, paste the reflectance coating 1213 of having implemented aluminium-vapour deposition etc. to each face 1212g, the 1212h of diffusely reflecting surface 1212c and V-groove 1212f.In diffusely reflecting surface 1212c, almost be reflected entirely by this prism facets light, but the light transmission of small part arranged and leak into the outside.Reflectance coating 1213 reflections of diffusely reflecting surface 1212c turn back to light conductor 1212 inside with this reflected light via diffusely reflecting surface 1212c from the light that this diffusely reflecting surface 1212c leaks.And in the rearward end of light conductor 1212, nearly all light will leak from rear end face 1212e.The part of the light that reflectance coating 1213 reflection of the face 1212g of V-groove 1212f will be leaked from rear end face 1212e, and this reflected light turned back to light conductor 1212 inside.
The light conductor 1212 of this routine optical discharge apparatus 1210 also can make the light intensity distributions homogenising in all zones of the direction of principal axis (length direction) of photosensitive drums 11 to the irradiates light of photosensitive drums 11.
And, near the rearward end of light conductor 1212, paste reflectance coating 1213 to diffusely reflecting surface 1212c and V-groove 1212f, the part of the light that leaks from diffusely reflecting surface 1212c by 1213 reflections of this reflectance coating and the light that will leak from rear end face 1212e, and make it turn back to light conductor 1212 inside, therefore near the light quantity from the irradiates light of light emergence face 1212b the rearward end of light conductor 1212 increases, and can further make the light quantity distribution homogenising of irradiates light.
In addition, the material of these optical discharge apparatus 1210 employed light conductors 1212, manufacture method are identical with above-mentioned embodiment 1.
(embodiment 3)
The optical discharge apparatus that embodiments of the present invention 3 relate to as shown in Figure 8.
This optical discharge apparatus 1310, it is the variation of the optical discharge apparatus of Fig. 4, be that the leaded light path 1312f of portion is made the structure of turning back, and between this leaded light path 1312f of portion and diffusely reflecting surface 1312c, be formed for light (irradiates light of the LED lamp 111) bending that to incide light entrance face 1312a and reflecting surface (fully reflecting surface) 1312g, the 1312h that is directed to diffusely reflecting surface 1312c.And the diffusely reflecting surface 1312c of this routine light conductor 1312 is with respect to the height H of light emergence face 1312b and the width of diffusely reflecting surface 1312c, and is identical with light conductor 112 shown in Figure 4.
And, shown in the amplification of Fig. 9 shows, form precipitous dip plane 1312i in the rearward end of light conductor 1312, near the rearward end of light conductor 1312, paste the reflectance coating 1313 of having implemented aluminium-vapour deposition etc. to diffusely reflecting surface 1312c and dip plane 1312i.The reflectance coating 1313 of diffusely reflecting surface 1312c reflects the light that leaks from this diffusely reflecting surface 1312c, and this reflected light is turned back to light conductor 1312 inside via diffusely reflecting surface 1312c.And the reflectance coating 1313 of dip plane 1312i reflects the light that will leak from the rear end of light conductor 1312, and this reflected light is turned back to light conductor 1312 inside.
According to this routine optical discharge apparatus 1310, can increase the optical path length of charge removing area, and need not to increase the length of light conductor 1312 at optical axis direction.Consequently can realize the miniaturization of image processing system.
And, near the rearward end of light conductor 1312, paste reflectance coating 1313 to diffusely reflecting surface 1312c and dip plane 1312i, reflect from the light of diffusely reflecting surface 1312c leakage and the light that will leak by this reflectance coating 1313 from the rear end, and make it turn back to light conductor 1312 inside, therefore near the light quantity from the irradiates light of light emergence face 1312b the rearward end of light conductor 1312 increases, and can further make the light quantity distribution homogenising of irradiates light.
In addition, the material of these optical discharge apparatus 1310 employed light conductors 1312, manufacture method are identical with above-mentioned embodiment 1.
In the example of Fig. 8, be the structure that the leaded light path 1312f of portion is turned back, but be not limited thereto, also can be the structure (roughly L type structure) that the leaded light path 1312f of portion extends along the direction of intersecting with respect to diffusely reflecting surface 1312c.
(embodiment 4)
The optical discharge apparatus that embodiments of the present invention 4 relate to such as Figure 10 and shown in Figure 11.
This optical discharge apparatus 1410, light conductor 1412 made turn back shape and the first reflecting part R1 is set and the second reflecting part R2, and on this first reflecting part R1 and the second reflecting part R2, form diffusely reflecting surface (prism facets) 1412c, the 1422c that will reflect towards photosensitive drums 11 (with reference to Fig. 3) respectively from the light of LED lamp 111, and between two diffusely reflecting surface 1412c, 1422c, form reflecting surface (fully reflecting surface) 1412g, 1412f, be used for the light path of the light by the first reflecting part R1 is crooked and be directed to the second reflecting part R2.
Each diffusely reflecting surface 1412c, 1422c following formation respectively: with respect to height H 1, the H2 of the light emergence face 1412b of light conductor 1412, and the width W 1 of this diffusely reflecting surface 1412c, 1422c, W2 (length of the direction vertical) with the direction of principal axis of photosensitive drums 11, according to distance, diminish with certain ratio along with the rear end face 1412e of close light conductor 1412 apart from each led light source 111.And two diffusely reflecting surface 1412c, 1422c form with the mutual opposite configuration of the working direction of light.
And, near the rearward end of light conductor 1412, paste the reflectance coating 1413 applied aluminium-vapour deposition etc. to diffusely reflecting surface 1422c.Reflectance coating 1413 reflects the light that leaks from this diffusely reflecting surface 1422, and this reflected light is turned back to light conductor 1412 via diffusely reflecting surface 1422c.
And in the light conductor 1412 of Figure 10, the back side 1422d of the back side 1412d of the first reflecting part R1 and the second reflecting part R2 tilts respectively, the terminal part of the first reflecting part R1 with respect to the height of light emergence face 1412b, with the leading section of the second reflecting part R2 with respect to the height of light emergence face 1412b about equally.
And, according to the optical discharge apparatus in this example 1410, the less zone of catoptrical light quantity for a diffusely reflecting surface 1412c (perhaps diffusely reflecting surface 1422c) who forms on the light conductor 1412, can replenish by the reflected light of another diffusely reflecting surface 1422c (perhaps diffusely reflecting surface 1412c), therefore can realize the homogenising of axial whole light quantity distribution of photosensitive drums 11.
And, near the rearward end of light conductor 1412, paste reflectance coating 1412 to diffusely reflecting surface 1422c, the light that leaks from diffusely reflecting surface 1422c by 1413 reflections of this reflectance coating also makes it turn back to light conductor 1412 inside, therefore near the light quantity from the irradiates light of light emergence face 1412b the rearward end of light conductor 1412 increases, and can further make the light quantity distribution homogenising of irradiates light.
And the material of these optical discharge apparatus 1410 employed light conductors 1412, manufacture method etc. are identical with above-mentioned embodiment 1.
(embodiment 5)
Figure 12 is the figure of the image processing system that relates to of expression embodiments of the present invention 5.
This routine image processing system 2200, be according to the image processing system of the view data that transmits from the outside, constitute: exposing unit 21, developer 22a～22d, photosensitive drums 23a～23d, charged device 25a～25d, optical discharge apparatus 2100a～2100d, cleaning unit 24a～24d, intermediate transfer belt 27, intermediate transfer belt unit 28, fixation unit 212, paper transport path 2S, paper feed tray 210, the row's of reaching paper disc 215 etc. by following each several part at the colored tandem of predetermined recording paper formation polychrome and monochrome image.
The view data of handling in image processing system 2200 and has used black (K), cyan (C), pinkish red (M), yellow (Y) versicolor coloured image corresponding.Therefore as shown in figure 12, developer 22a, 22b, 22c, 22d, photosensitive drums 23a, 23b, 23c, 23d, charged device 25a, 25b, 25c, 25d, optical discharge apparatus 2100a, 2100b, 2100c, 2100d, reach cleaning unit 24a, 24b, 24c, 24d, be respectively equipped with four, constitute four image station Sa, Sbs, Sc, the Sd corresponding with shades of colour (K, C, M, Y) in order to form four kinds of latent images corresponding with shades of colour (K, C, M, Y).And each symbol " a ", " b ", " c ", " d " correspond respectively to black, cyan, magenta, yellow.
Charged device 25a～25d is a kind of Charging system, be used to make the surface of photosensitive drums 23a～23d evenly to have predetermined current potential, in this example, as Figure 15, Figure 17 and shown in Figure 180, used to have jagged sparking electrode 251, netted grid 252, and cover the corona charging device of the charged casing 250 of sparking electrode 251.Optical discharge apparatus 2100a～2100d is used to remove the electric charge on photosensitive drums 23a～23d surface.In addition optical discharge apparatus 2100a～2100d is being discussed after a while in detail.
Exposing unit 21 has following function: according to the view data of input, with charged photosensitive drums 23a～23d exposure, thereby form the electrostatic latent image corresponding with view data on the surface of each photosensitive drums 23a～23d.Exposing unit 21 uses the laser scan unit (LSU) with laser irradiating part 21a and catoptron 21b etc.And, also can use for example EL, LED that light-emitting component is arranged as array-like to write first-class as exposing unit 21.
Developer 22a～22d is the device that the electrostatic latent image of the last formation of each photosensitive drums 23a～23d is developed by the toner of shades of colour (K, C, M, Y).Cleaning unit 24a～24d is used to remove, reclaim the lip-deep toner of photosensitive drums 23a～23d that remains in after development, the image transfer printing.
Intermediate transfer belt unit 28 is configured in the top of photosensitive drums 23a～23d.Intermediate transfer belt unit 28 has: intermediate transfer belt 27; Intermediate transfer belt driven roller 271; Intermediate transfer belt tension mechanism 273; Intermediate transfer belt driven voller 272; Intermediate transfer rollers 26a, 26b, 26c, 26d; And intermediate transfer belt cleaning unit 29.These intermediate transfer belt driven rollers 271, intermediate transfer belt tension mechanism 273, intermediate transfer rollers 26a～26d and intermediate transfer belt driven voller 272 etc. are frame intermediate transfer belts and drive the device that intermediate transfer belt 27 makes it rotate along arrow Z direction.
The transfer printing of 27 toner image from photosensitive drums 23a～23d to intermediate transfer belt, the intermediate transfer rollers 26a～26d that contacts by the back side with intermediate transfer belt 27 carries out.Apply high pressure transfer bias (with the high voltage of charged polarity (-) opposite polarity (+) of toner) to intermediate transfer rollers 26a～26d, be used for the transfer printing toner image.
As mentioned above, each photosensitive drums 23a～23d corresponding, electrostatic image of having developed last and of all kinds by intermediate transfer belt 27 laminations, becomes the image information that is input in the device.The image information of lamination by the rotation of intermediate transfer belt 27, is transferred on the recording chart by the transfer belt 211 on the contact position that is configured in following recording chart and intermediate transfer belt 27 like this.
At this moment, intermediate transfer 27 and transfer roll 211 are crimped with predetermined roll gap, and apply to transfer roll 211 and to be used for toner is transferred to voltage on the recording chart (with the high pressure of charged polarity (-) opposite polarity (+) of toner).Further, transfer roll 211 obtains above-mentioned roll gap for total energy, the any one party that preferably makes transfer roll 211 or above-mentioned intermediate transfer belt driven roller 271 is hard material (metal etc.), and the opposing party is soft materials such as resilient roller (for example elastic caoutchouc roller or a foaminess resin roll etc.).
And, as mentioned above, by with contacting of photosensitive drums 23a～23d attached to the toner on the intermediate transfer belt 27, perhaps do not carry out transfer printing to recording chart and remain in toner on the intermediate transfer belt 27 by transfer roll 211, can become the reason that makes the toner colour mixture in the operation in the back, therefore remove, reclaim by intermediate transfer belt cleaning unit 29.
Intermediate transfer belt cleaning unit 29 has the parts that contact with intermediate transfer belt 27, for example has cleaning balde as cleaning member, and the intermediate transfer belt 27 of this cleaning balde contact supports from the inboard by intermediate transfer belt driven voller 27.
And, in image processing system 2200, be provided be used for the recording chart of paper feed tray 210 via transfer printing portion 211, fixation unit 212 and the row's of being sent to paper disc 215, roughly be the paper transport path S of vertical configuration.And, near the paper transport path S from paper feed tray 210 to row's paper disc 215, dispose the transfer roller 221～228 of pick-up roller 216, resistance roller 214, transfer roll 211, fixation unit 212, transfer sheet.
Pick-up roller 216 is set at the end of paper feed tray 210.Pick-up roller 216 is the draw rolls that are used for from paper feed tray 210 recording chart being provided to one by one paper transport path S.Resistance roller 214 is to be used for temporarily being kept at the roller that paper transport path S goes up the recording chart that transmits, and in the moment of the front end of the toner image on intermediate transfer belt 27 and the alignment of the front end of recording chart, recording chart is sent to transfer roll 211.
And, warm-up mill 212a, be set to by becoming predetermined fixing temperature based on control from the signal of not shown Temperature Detector, and by recording chart being carried out hot pressing with backer roll 212b, the fusion of polychrome toner, mixing, the crimping of recording chart will be transferred to, and hot photographic fixing is to recording chart.
And the recording chart after the photographic fixing of polychrome toner image is sent to the counter-rotating row paper path of paper transport path S by transfer roller 222,223, and (with the polychrome toner image towards downside) is discharged on the paper disc 215 under the state of counter-rotating.
Then paper transport path is elaborated.
At first, in this routine image processing system 2200, dispose: paper feeding box 210, put paper in advance; With manual dish 220, when the user carries out the printing of less paper, can not carry out the switch motion of paper feeding box 210.These paper feeding boxes 210 and manually the paper feeding of dish 220 carries out by the following method: by being separately positioned on the pick-up roller 216,217 that respectively coils 210,220 end, recording chart is sent to transfer path one by one.
The recording chart that sends from paper feeding box 210, be sent to resistance roller 214 by the transfer roller in the transfer path 221, in the moment in the front end coupling of the front end of recording chart and the image information on the intermediate transfer belt 27, be sent to transfer roll 211, and image information is written on the recording chart.Afterwards, recording chart is by fixation unit 212, thereby the not photographic fixing toner on the recording chart is discharged to paper disc 215 on (during single face print request) through transfer roller 222 from exit roller 223 by heat fusing, fixing.
On the other hand, the recording chart that is accumulated on the manual feed dish 220 is provided by pick-up roller 217, and through a plurality of transfer rollers 226,225,224 arrival resistance rollers 214, afterwards through the path same with the recording chart that provides from paper feeding box 210, the row's of being discharged to paper disc 215 (when requiring single face to print).
When the print request content is the duplex printing request, after finishing aforesaid single face and printing, to have passed through the rear end of the recording chart of fixation unit 212 and clamped by exit roller 223, the reverse rotation by exit roller 223 is directed into transfer roller 227,228.And, after finishing duplex printing, be discharged to paper disc 215 through resistance roller 214.
-optical discharge apparatus-
Then optical discharge apparatus 2100a～2100d (hereinafter referred to as " optical discharge apparatus 2100 ") is described.And each photosensitive drums 23a～23d is called " photosensitive drums 23 " in the following description.
And, among the back side 2102d of light conductor 2102, in the zone corresponding with reflecting part X2 and reflecting part X3, diffusely reflecting surface (prism facets) 2102c that formation will be reflected towards photosensitive drums 23 from the light of LED lamp 2101.This diffusely reflecting surface 2102c is constant in reflecting part X2 with respect to the height H of light emergence face 2102b.And the diffusely reflecting surface 2102c among the reflecting part X3 diminishes along with the rearward end (the rear end face 2102e of light conductor 2102) of close reflecting part X3 with respect to the height H of light emergence face 2102b.And, the width W of diffusely reflecting surface 2102c (length of the direction vertical with the direction of principal axis of photosensitive drums 23) is unfixing, shown in Figure 13 (B), form following pattern: from the end of the light inlet side of reflecting part X2 to reflecting part X3, width diminishes gradually, from reflecting part X2 midway to the rearward end (the rear end face 2102e of light conductor 2102) of reflecting part X2, it is big that width becomes gradually.
As mentioned above, in this routine light conductor 2102, will be from the light of LED lamp 2101 towards the diffusely reflecting surface 2102c of photosensitive drums 23 reflections height H (length of Y direction) with respect to light emergence face 2102b, change according to position (position of directions X) with respect to LED lamp 2101, and, the width W of diffusely reflecting surface 2102c is also according to changing with respect to the position (position of directions X) of LED lamp 2101, therefore can make the light intensity distributions homogenising of the irradiates light that shines photosensitive drums 23 in the Zone Full of the direction of principal axis (length direction) of photosensitive drums 23.
The mounting structure of-light conductor etc.-
Then the mounting structure of light conductor 2102 etc. is described.
In light conductor 2102, as shown in figure 14, in the bottom of leading section and the bottom of rearward end, integrally formed anterior supporting slice 2121 and rear support sheet 2122 respectively.Be provided for through hole 2121a, the 2122a of positioning and fixing on the central portion of anterior supporting slice 2121 and rear support sheet 2122 respectively.
On the other hand, anterior support unit 2104 and rear support parts 2105 all are resin forming products.In the anterior support unit 2104, as shown in figure 17, be provided with the chimeric recess 2104a of the anterior supporting slice 2121 that can embed light conductor 2102, be provided with retention tab 2104b, 2104b in the inner face central authorities of this chimeric recess 2104a.And as shown in figure 18, on rear support parts 2105, also be provided with the chimeric recess 2105a of the rear support sheet 2122 that can embed light conductor 2102, be provided with retention tab 2105b, 2105b in the inner face central authorities of this chimeric recess 2105.
And, the chimeric recess 2104a that the anterior supporting slice 2121 and the rear support sheet 2122 of light conductor 2102 is embedded into anterior support unit 2104 respectively and the chimeric recess 2105a of rear support parts 2105, and forwardly the through hole 2121a of supporting slice 2121 is embedded in retention tab 2104b, 2104b, and then be embedded in retention tab 2105b at the through hole 2122 of rear support sheet 2122,2105b, thereby the leading section of light conductor 2102 and rearward end are supported by anterior support unit 2104 and rear support parts 2105 respectively, and make light conductor 2102 all in the side of charged casing 250 positioning and fixing.
And, so light conductor 2102 is being fixed under the state of charged casing 250, as Figure 15 and shown in Figure 16, set shape, the size of each several parts such as anterior support unit 2104 and rear support parts 2105, so that the light emergence face 2102b of light conductor 2102 is positioned at the position lower than the upper surface of charged casing 250.And, LED lamp 2101 be set at be fixed on charged casing 250 on state under the relative position of light entrance face 2102a of light conductor 2102.This LED lamp 2101 is supported in the side of side-wall metallic plate (not shown) of rear portion one side of image processing system via support unit 2103.
As mentioned above, by light conductor 2102 is bearing on the charged casing 250 of corona charging device 25, can dwindle the space that is provided with of light conductor 2102.Particularly when image processing system is the image processing system 2200 of colored tandem moor, in the prior art, the space (occupying the space) that is provided with of light conductor 2102 is to hinder the factor that miniaturization realizes, but in this example, according to image station Sa, Sb, Sc, the Sd corresponding with shades of colour, can dwindle the space that is provided with of light conductor 2102 respectively, but therefore implement device significantly miniaturization on the whole.
Further, it is characterized in that following 2 points in this example: as mentioned above with the rear end face 2102e of light conductor 2102 as transparent surface; And at the rear of the rear end face 2102e of light conductor 2102 configuration reflecting surface 2151a.Its concrete structure is described as follows.
At first, in this example, as Figure 15 and shown in Figure 16, integrally formed reflection part 2150 on the rear support parts 2105 of the rearward end that supports light conductor 2102.Reflection part 2150 is quadrangular parts that the below of 2102 the rear end face 2102e along above-below direction from light conductor extends to the top, is configured in the rear of the rear end face 2102e of light conductor 2102.In the reflection part 2150, reflectance coating 2151 is sticked on the opposite face 2150a relative with the rear end face 2102e of light conductor 2102, the front of this reflectance coating 2151 becomes reflecting surface 2151a.The reflecting surface 2151a of reflection part 2150, be with perpendicular to parallel plane of the central shaft of photosensitive drums 23, be configured in reflecting surface 2151a with respect to the rear end face 2102e of light conductor 2102 on the position at predetermined interval (for example 0.5mm).And,, for example use on the surface of polycarbonate membrane and formed the film that metallic films such as aluminium, chromium, nickel, chromium-nickel alloy or gold form by evaporation etc. as reflectance coating 2151.
As mentioned above, by the rear end face 2102e of light conductor 2102 is configured to the rear of the rear end face 2102e of this light conductor 2102 under the state that separates as transparent surface, with reflecting surface 2151a, the even effect of the irradiates light that is brought except the shape (highly, width) of above-mentioned diffusely reflecting surface 2102c, can also increase from shining the light quantity of the irradiates light on the photosensitive drums 23 near the rearward end of light conductor 2102, therefore can further make the light quantity distribution homogenising of the irradiates light that shines photosensitive drums 23.
Further, because integrally formed reflection part 2150 on the rear support parts 2105 of the rearward end that supports light conductor 2102, therefore can make the position relation of the reflecting surface 2151a at the rear end face 2102e of light conductor 2102 and its rear keep certain, thereby can guarantee not have the stable reflection that fluctuates.
And in above example, the rear end face 2102e of the relative light conductor 2102 of reflecting surface 2151a had at interval be configured, but also can be configured to make rear end face 2102e that reflecting surface 2151a touches light conductor 2102 (at interval=0mm).
And, reflectance coating 2151 is pasted on the opposite face 2150a of reflection part 2150 and form reflecting surface 2151a, but also can on the opposite face 2150a of reflection part 2150, directly form metallic films such as chromium, nickel, chromium-nickel alloy or gold, thereby form reflecting surface 2151a.Further, also can constitute by metal under the situation, implement mirror finish, thereby form reflecting surface 151a to the opposite face 2150a relative with the rear end face 2102e of light conductor 2102 at rear support parts 2105 (reflection part 2150).
At this, in the optical discharge apparatus of the present invention,, also comprise anterior support unit 2104 discussed above and rear support parts 2105 support units such as (also comprising reflection part 2150) etc. as inscape.
-other characteristics-
In the charged casing 250 of employed corona charging device 25,, on box bottom 250b, have the peristome 250a, the 250a that are used to deflate in this example as Figure 17 and shown in Figure 180.Each peristome 250a, 250a are the openings of the slit-shaped of extending along the length direction of charged casing 250.By peristome 250a, the 250a that so is provided for deflating at the box bottom 250b of charged casing 250, and on than the high position of these peristomes 250a, 250a, dispose light conductor 2102, can prevent of the harmful effect of the air that contain ozone of generation in the charged casing 250 light conductor 2102.Promptly, the ozone that corona discharge produced is because self gravitation is trapped in the bottom of charged casing 250, but this delay ozone is discharged to the below by peristome 250a, 250a, therefore by light conductor 2102 being configured on the high position of the 250a of ratio open portion, 250a, can prevent that the diffusely reflecting surface 2102c of light conductor 2102 and the reflecting surface 2151a of reflection part 2150 etc. are because of ozone deterioration (corrosion etc.).
And as shown in figure 19, below charged casing 250, be provided for discharging gas outlet 2106, vent fan 2107 and the deozonize filtrator 2108 of the air that comprises foul smell, driving by vent fan 2107, peristome 250a, 250a by the bottom of charged casing 250 is directed in the gas outlet 2106 with the charged casing 250 interior air that comprise ozone that produce, forcibly carry out exhaust, under this structure, can more effectively prevent the deterioration of light conductor 2102 and reflection part 2150.Further, when carrying out this forced exhaust, also (25a～25d) upward four set gas outlets are connected with a collection tube each corona charging device 25 of the last configuration of image station Sa～Sd that can be corresponding with shades of colour, and the air that utilizes vent fan will be collected in this collection tube carries out exhaust via the deozonize filtrator, when adopting this structure, since the further miniaturization of implement device integral body, therefore preferred the use.
In above example, make the wide variety of the diffusely reflecting surface 2102c of light conductor 2102, but the present invention is not limited to this, the constant width that also can be applicable to use diffusely reflecting surface is the image processing system of the light conductor that changes of height (light conductor height) only.
In above example, be that example is illustrated with the image processing system that applies the present invention to colored tandem moor, the present invention also can be applicable to form the image processing system of monochrome image.
Below the example and the comparative example of optical discharge apparatus that embodiments of the present invention 1～5 are related to together describe.
(embodiment and comparative example)
At first, in Fig. 3 that embodiment 1～4 relates to and optical discharge apparatus 110 shown in Figure 4, the thick of light conductor 112 is 3mm, the length of diffusely reflecting surface 112c is 300mm, diffusely reflecting surface 112c with respect to height (light conductor height) H of light emergence face 112b shown in Figure 20 (A), begin till the X=125mm constant (H=8mm) from the leading section (X=0) of diffusely reflecting surface 112c, from the position of X=125mm begin till the rearward end (X=300mm) of diffusely reflecting surface 112c during in, in the scope of 8mm～4.2mm with certain rate of change (minimizing).Further, the width W of diffusely reflecting surface 112c is shown in Figure 20 (B), from the leading section (X=0) of diffusely reflecting surface 112c begin till the X=50mm during in, in the scope of 4.5mm～3mm with certain rate of change (minimizing), from the position of X=50mm begin till the rearward end (X=300mm) of diffusely reflecting surface 112c during in, in the scope of 3mm～4mm, change (increase) with as shown in the figure pattern.
And, shown in Figure 21 (a), with the light conductor 112 that do not carry out rearward end processing fully as a comparative example 1, and shown in Figure 21 (b), to near rearward end, paste the light conductor 112 of reflectance coating 113 as embodiment 1 by upper surface, shown in Figure 21 (c), (d), (e), near the light conductor 112 that forms V-groove 112f above rearward end and pasted reflectance coating 113 is as embodiment 2,3,4, shown in Figure 21 (f), the light conductor 112 that will form dip plane 112i and paste reflectance coating 113 in rearward end is as embodiment 5.
The tilt angle theta of the face 112g of V-groove 112f among the embodiment 2 to 4 as shown in figure 22, it is the angle that the upper surface with respect to light conductor 112 tilts downwards, in embodiment 2 tilt angle theta being set at 75 spends, in embodiment 3, tilt angle theta is set at 45 degree, in embodiment 4, tilt angle theta is set at 15 and spends.And in any one embodiment of embodiment 2 to 4, the degree of depth of V-groove 112f all is made as 1mm.And in embodiment 5 tilt angle theta being set at 45 spends.
Near in the chart of Figure 23 the rearward end of the light conductor 112 of expression comparative example 1 and embodiment 1 to 5 situation.
Figure 24 be represent respectively among comparative example 1 and the embodiment 1 to 5, from LED lamp 111 chart from the light intensity distributions characteristic of the rayed light of light emergence face 112b when the light entrance face 112a of light conductor 112 incident light, wherein transverse axis is represented to begin distance till the rayed position from LED lamp 111, and the longitudinal axis is represented light intensity.And Figure 25 is that the light intensity distributions characteristic with comparative example 1 is a benchmark, and the light intensity distributions characteristic of comparative example 1 and embodiment 1 to 5 is carried out the chart that standardization is represented.
In the chart of Figure 24 and Figure 25, the light intensity distributions characteristic of comparative example 1 is represented with H, the light intensity distributions characteristic of embodiment 1 is represented with J1, the light intensity distributions characteristic of embodiment 2 is represented with J2, the light intensity distributions characteristic of embodiment 3 is represented with J3, the light intensity distributions characteristic of embodiment 4 represents that with J4 the light intensity distributions characteristic of embodiment 5 is represented with J5.
And, in the chart of Figure 24 and Figure 25, transverse axis corresponding with the image forming area of photosensitive drums 11 apart from 10mm～300mm, and apart near near the rearward end that becomes light conductor 112 300mm.And in this image forming area,, can obtain not have the image of the unequal high-quality of image if during more than or equal to threshold value k (shown in Figure 24), can carry out removing fully electricity to photosensitive drums 11 from light-struck light intensity of light conductor 112.
Further, Figure 26 is the bar graph apart near the light intensity the 300mm of expression comparative example 1 and embodiment 1 to 5.
Can be clear and definite from the chart of Figure 26 to Figure 28, in any one of light intensity distributions characteristic J1～J5 of the light intensity distributions characteristic H of comparative example 1 and embodiment 1 to 5, after all in the scope of distance 50mm～100mm, arriving maximum light intensity, along with the elongated light intensity of distance descends gradually.
And the light intensity distributions characteristic H of comparative example 1 drops to light intensity and is lower than threshold value k near the distance 300mm, promptly near the rearward end of light conductor 112.Therefore, when using the light conductor 112 of comparative example 1, can't carry out fully removing electricity to photosensitive drums 11 near distance 300mm, it is unequal image to take place.
And the light intensity distributions characteristic J1 of embodiment 1 is near the distance 300mm, promptly near the rearward end of light conductor 112, and light intensity also surpasses threshold value k slightly.Therefore, when using the light conductor 112 of embodiment 1, even near distance 300mm, also can carry out fully removing electricity to photosensitive drums 11, it is unequal can not image to take place.
Further, light intensity distributions characteristic J2～J5 of embodiment 2 to 5, near the distance 300mm, promptly near the rearward end of light conductor 112, light intensity is also considerably beyond threshold value k.Therefore when using the light conductor 12 of embodiment 2 to 5, even near distance 300mm, also can carry out fully removing electricity to photosensitive drums 11, it is unequal can not image to take place.
Comparison by comparative example 1 and embodiment 1 to 5 can be clear and definite, paste reflectance coating 113 or near the rearward end of light conductor 112, form V-groove 112f and paste reflectance coating 113 near the upper surface rearward end of light conductor 112, perhaps the rearward end at light conductor 112 forms dip plane 112i and pastes reflectance coating 113, all can improve light intensity near the rearward end of light conductor 112.Therefore, even near distance 300mm, also can remove photosensitive drums 11 effectively.
Then, in the light conductor shown in Figure 13 2102 that embodiment 5 relates to, the same with the example of above-mentioned embodiment 1～4, shown in Figure 20 (A), thick is 3mm, the length of diffusely reflecting surface 2102c is 300mm, diffusely reflecting surface 2102c is with respect to height (light conductor height) H of light emergence face 2102b, for the leading section (X=0) from diffusely reflecting surface 2102c begins till the X=125mm constant (H=8mm), from the position of X=125mm begin till the rearward end (X=300mm) of diffusely reflecting surface 2102c during in, in the scope of 8mm～4.2mm with certain rate of change (minimizing).Further, the width W of diffusely reflecting surface 2102c is shown in Figure 20 (B), from the leading section (X=0) of diffusely reflecting surface 2102c begin till the X=50mm during in, in the scope of 4.5mm～3mm with certain rate of change (minimizing), from the position of X=50mm begin till the rearward end (X=300mm) of diffusely reflecting surface 2102c during in, in the scope of 3mm～4mm, change (increase) with the pattern shown in Figure 20 (B).
In above-mentioned light conductor 2102, rear end face 2102e as transparent surface, is provided with this light conductor 2102 with Figure 15 and mode shown in Figure 16, at the rear of the rear end face 2102e of light conductor 2102 configuration reflecting surface 2151a.And contact with the rear end face 2102e of light conductor 2102 with reflecting surface 2151a that () mode is as embodiment 6 at interval=0, and (at interval=0.5mm), (at interval=1mm), embodiment 9 (at interval=2mm) for embodiment 8 as embodiment 7 with making the rear end face 2102e of light conductor 2102 and mode that the interval between the reflecting surface 2151a is respectively 0.5mm, 1mm, 2mm with reflection part 2150.Wherein reflecting surface 2151a forms by the opposite face 2150a stickup reflectance coating (polycarbonate membrane+aluminium-vapour deposition) 2151 at reflection part 2150.
On the other hand, in above-mentioned light conductor 2102, with do not carry out fully processing near the rearward end as a comparative example 2.And will carry out the end portion treatment (end cutting) of rearward end, rear end face after carrying out this processing to above-mentioned light conductor 2102 and paste mylar (washing Te Lun (Tetolon) film+aluminium-vapour deposition) as a comparative example 3 of reflectance coating.
Each light conductor of the foregoing description 5～9 and comparative example 2,3 is measured from the light intensity distributions of LED lamp emergent light when the light entrance face irradiates light of light conductor.Its result is shown in the chart of Figure 28.And the mensuration of light intensity distributions is by carrying out with position relation configuration LED lamp, light conductor and tester shown in Figure 27.And, only put down in writing distance in the chart of Figure 28 and be the scope of 240mm～310mm.
In the chart of Figure 28, the scope till the 300mm of transverse axis is corresponding with the image forming area of photosensitive drums 23, and is corresponding near the rearward end apart near and the light conductor of 300mm.And, in the image forming area of photosensitive drums 23,, then can carry out removing fully electricity to photosensitive drums 23 if surpass threshold value k from the light intensity of the irradiates light of light conductor, can obtain not have the image of the unequal high-quality of image.
Can be clear and definite from the chart of above Figure 28, the light intensity distributions of comparative example 2, near the distance 300mm, promptly drop to light intensity near the rearward end at light conductor and be lower than threshold value k.Therefore in the structure of comparative example 2, can't carry out fully removing electricity to photosensitive drums 23 near distance 300mm, it is unequal image to take place.
Relative with it, the light intensity of embodiment 9 is near the distance 300mm, promptly near the rearward end of light conductor 2102, and light intensity also surpasses threshold value k slightly.Therefore, by adopting the structure of embodiment 9, even near distance 300mm, also can carry out fully removing electricity to photosensitive drums 23, it is unequal can not image to take place.Further, the light intensity distributions of embodiment 6～8 is near the distance 300mm, promptly near the rearward end of light conductor 2102, and light intensity is also considerably beyond threshold value k.Therefore, by adopting the structure of embodiment 6～8, even near distance 300mm, also can carry out fully removing electricity to photosensitive drums 23, it is unequal can not image to take place.
And, in embodiment 6～8, near light intensity (300mm) apart near the light strength ratio comparative example 3 the 300mm is big, therefore can be clear and definite, compare with the method for pasting reflectance coating to the rear end face of light conductor, the method that reflecting surface is configured to the rear end face of light conductor under released state can obtain higher reflectivity.
In the measurement result of above embodiment 6～9, it is as shown in table 1 below to carry out standardized value R by the light intensity (apart from 300mm) of comparative example 2 apart from the light intensity of 300mm.And in the measurement result of the foregoing description 1～5, it is as shown in table 2 below to carry out standardized value R by the light intensity of comparative example 2 (apart from 300mm) apart from the light intensity of 300mm.
Table 1
| R | |
| Comparative example 2 | 1 |
| Embodiment 6 | 1.7 |
| Embodiment 7 | 1.63 |
| | 1.52 |
| Embodiment 9 | 1.3 |
Table 2
| R | |
| Comparative example 2 | 1 |
| | 1.2 |
| | 1.66 |
| Embodiment 3 | 1.52 |
| Embodiment 4 | 1.39 |
| | 1.64 |
In above-mentioned table 1 and table 2, embodiment 1～9 is compared, it is equal or surpass their effect (light intensity of rearward end increases effect) with embodiment 1～5 to find that embodiment 6～9 has.And, need not resemble the embodiment 1～5 and carry out following rearward end processing: near the rearward end upper surface of light conductor is pasted the processing of reflectance coating, rearward end at light conductor, form V-groove and paste the processing of reflectance coating or the processing etc. that forms the dip plane and paste reflectance coating in the rearward end of light conductor by long light conductor self according to embodiment 6～9.Therefore under the situation of embodiment 6～9, by at the rear of the rear end face of light conductor with the reflecting surface configured separate, can increase near the light quantity of the irradiates light that shines to photosensitive drums the rearward end of light conductor, and make the light quantity distribution homogenising of the irradiates light that shines on the photosensitive drums.
Therefore, the present invention can be used for following purpose effectively: form the optical discharge apparatus of handling the residual charge of removing photoreceptor by rayed and have in the image processing systems such as duplicating machine of this optical discharge apparatus at the image of electrofax mode, make for the electric charge of removing photoreceptor the light quantity distribution homogenising to the irradiates light of photoreceptor irradiation.
And the present invention can implement with other variety of ways under the prerequisite that does not break away from its purport or principal character.Therefore no matter the foregoing description all is simple example from which aspect, must not do determinate explanation.Scope of the present invention is not subjected to any constraint of instructions text shown in the claim scope.And interior distortion, the change of the impartial scope that belongs to the claim scope all belongs within the scope of the invention.
Claims (17)
1. optical discharge apparatus is used for removing at the image processing system of electrofax mode the electric charge of photoreceptor, it is characterized in that:
Have the light conductor that is oppositely arranged with above-mentioned photoreceptor, and to the light source of the light entrance face irradiates light of this light conductor, in above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, this diffusely reflecting surface is with respect to the height to the light emergence face of above-mentioned photoreceptor of this light conductor, and the width of this diffusely reflecting surface, change near the upper surface configuration reflection part the terminal part of above-mentioned light conductor according to distance apart from above-mentioned light source.
2. optical discharge apparatus is used for removing at the image processing system of electrofax mode the electric charge of photoreceptor, it is characterized in that:
Have the light conductor that is oppositely arranged with above-mentioned photoreceptor, and to the light source of the light entrance face irradiates light of this light conductor, in above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, this diffusely reflecting surface is with respect to the height to the light emergence face of above-mentioned photoreceptor of this light conductor, and the width of this diffusely reflecting surface, change according to the distance apart from above-mentioned light source, near the upper surface the terminal part of above-mentioned light conductor forms the groove that traverses this light conductor.
3. optical discharge apparatus according to claim 2 is characterized in that:
Near upper surface and traverse the inner face of the above-mentioned groove of this light conductor, the configuration reflection part terminal part of above-mentioned light conductor.
4. optical discharge apparatus is used for removing at the image processing system of electrofax mode the electric charge of photoreceptor, it is characterized in that:
Have the light conductor that is oppositely arranged with above-mentioned photoreceptor, and to the light source of the light entrance face irradiates light of this light conductor, in above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, this diffusely reflecting surface is with respect to the height to the light emergence face of above-mentioned photoreceptor of this light conductor, and the width of this diffusely reflecting surface, change according to the distance apart from above-mentioned light source, the terminal part of above-mentioned light conductor has precipitous dip plane.
5. optical discharge apparatus according to claim 4 is characterized in that:
On near the upper surface terminal part of above-mentioned light conductor and above-mentioned precipitous dip plane, dispose reflection part.
6. according to any described optical discharge apparatus of claim 1 to 5, it is characterized in that:
Above-mentioned light conductor is turned back, and at the place of turning back of this light conductor, is provided with the reflecting surface of the light path bending that is used to make this light conductor.
7. an image device will contain the image forming part tandem arrangement of each photoreceptor, it is characterized in that:
On above-mentioned each photoreceptor, be respectively equipped with any described optical discharge apparatus of claim 1 to 6.
8. optical discharge apparatus is used for removing at the image processing system of electrofax mode the electric charge of photoreceptor, it is characterized in that:
Have the light conductor that is oppositely arranged with above-mentioned photoreceptor, and to the light source of the light entrance face irradiates light of this light conductor, in above-mentioned light conductor, form the diffusely reflecting surface that will reflect towards above-mentioned photoreceptor from the light of above-mentioned light source, and the rear end face of this light conductor becomes transparent surface, at the rear of the rear end face of this light conductor configuration reflecting surface.
9. optical discharge apparatus according to claim 8 is characterized in that:
On the support unit of the rearward end that supports above-mentioned light conductor, integrally formed reflection part with above-mentioned reflecting surface.
10. it is characterized in that according to Claim 8 or 9 described optical discharge apparatus:
Above-mentioned reflecting surface is formed by metallic film.
11. optical discharge apparatus according to claim 10 is characterized in that:
The material that forms the metallic film of above-mentioned reflecting surface is nickel, chromium, nickel-chromium alloy or gold.
12. any described optical discharge apparatus according to Claim 8～11 is characterized in that:
Above-mentioned diffusely reflecting surface changes according to the distance apart from above-mentioned light source with respect to the height to the light emergence face of above-mentioned photoreceptor of this light conductor, and the width of this diffusely reflecting surface.
13. an image processing system is characterized in that:
Any described optical discharge apparatus with claim 8～12.
14. an image processing system is characterized in that:
In the described image processing system of claim 13, have the corona charging device of the surface charging that makes photoreceptor, above-mentioned light conductor is supported on the casing of this corona charging device via the support unit of the rearward end that supports above-mentioned light conductor.
15. image processing system according to claim 14 is characterized in that:
Be provided with the peristome that is used to deflate on the casing of above-mentioned corona charging device, above-mentioned light conductor is supported in than on the high position of this peristome.
16. image processing system according to claim 15 is characterized in that:
Be provided with exhaust equipment, the ozone that is used to discharge generation in the casing that is included in above-mentioned corona charging device is at interior air.
17. any described image processing system according to claim 13～16 is characterized in that:
This image processing system, be with the image processing system of a plurality of toner image forming devices along the tandem of the direction of transfer arranged in series of intermediate transfer material, wherein above-mentioned a plurality of toner image forming device is used for the toner image of each colour content is respectively formed at each photoreceptor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004275713 | 2004-09-22 | ||
| JP2004275713A JP4057003B2 (en) | 2004-09-22 | 2004-09-22 | Photostatic device and image forming apparatus using the same |
| JP2004299329 | 2004-10-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1752871A true CN1752871A (en) | 2006-03-29 |
| CN100454175C CN100454175C (en) | 2009-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101068110A Active CN100454175C (en) | 2004-09-22 | 2005-09-22 | Optical discharge apparatus and image forming apparatus containing the same |
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| JP (1) | JP4057003B2 (en) |
| CN (1) | CN100454175C (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100454175C (en) | 2009-01-21 |
| JP4057003B2 (en) | 2008-03-05 |
| JP2006091332A (en) | 2006-04-06 |
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