JPS63225275A - Method and device for forming image - Google Patents

Abstract

PURPOSE:To permit printing with high quality at high resolution by decreasing the adhesive power of a toner existing in the position of an image to be transferred corresponding to an image to be formed to a toner carrier. CONSTITUTION:Light is emitted from an optical writing head 24 selectively toward an OPC belt 21 when the part of a toner T arrives at the head 24. A carrier generating layer 37 in the position where the image to be transferred is, therefore, exposed and a carrier C of negative potential is generated from this part. The carrier C of the negative potential and the charge D of the positive potential in the surface part attract each other and move in the direction opposite from each other in a carrier transfer layer 38, by which said layer is electrically neutralized. The Coulomb force to adhere the toner T to the surface of the layer 38 is annihilated when the charge D of the positive potential on the surface of said layer is annihilated. The toner T of this part is the image to be transferred which can be transferred. The formation of the image having the extremely high resolution on paper 40 is thereby permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an image forming method J3 and an apparatus for forming an image on a record carrier using an electrophotographic method or the like.

(Prior Art) A conventional image forming apparatus of this type is formed as shown in FIG. 4, which shows a typical example of (a).

This conventional example uses an endless OPC belt 1 along with the photoreceptor. This OPC belt 1 is
, 2, a human roller 3 and a drive [1- It is supported by a roller 4, and is moved by the drive roller 4 in the direction of the arrow in the figure. Each component is arranged around this OPC belt 1 to form an image on a recording medium with rounded corners or the like.

That is, first, the OP is charged by the corona charging action of the charger 5.
C Bell]・Charge the surface of 1 to a uniform positive potential. Next, the OPC belt 1 is evaluated with electrostatic occult blood according to the printing pattern etc. by the light incorporation unit 6, and then the electrostatic latent blood written on the OPC belt 1 is selected by the developer 7. ('J f/
It rusts and forms a toner image. And this toner image is o
As the PC belt 1 moves, it hits the transfer device 8, and the toner image on the OPC belt 1 is transferred to the paper 9 by the electrostatic suction force of the transfer device 8. to form an image.

Thereafter, the paper 9 is peeled off from the OPC belt 1 and conveyed to the fixing device 10, where the toner image is fixed on the paper 9'' using heat or pressure.
J1 paper tray (not shown). On the other hand, the OPC belt 1 that has passed through the transfer core 8 portion is subjected to a static eliminator 11 to eliminate d+1 residual charges on the ○PC belts I-1 and J2, and then is placed on the OPC belt 1 by a cleaner 12.・One person cleaned the remaining toner.

[Problems that the invention attempts to solve]

However, in the conventional example, although the electrostatic latent image written by the optical writing unit 6 onto the OPC belt 1 is formed with extremely high resolution, the current &'247 According to ○The above Tp on PC belt 1
? When toner is applied to the latent image, the toner tends to adhere to areas other than the 0-electrode latent image, causing so-called fogging and dust, and forming a toner image with a low resolution of 1. However, the resolution of the image formed on the paper 9 was low, and there was a risk that the printed quality would deteriorate.

In addition, in order to achieve high resolution in development by the developing device 7, the bias voltage of the developing ink 7, the charging condition of the toner, and the gear attachment between the developing device 7 and the OPC belt 1 must be controlled very strictly. However, there were problems such as the device becoming complicated and maintenance becoming troublesome.

The present invention has been made in view of these points, and provides an image forming method and unit U that can form images with high resolution and can print A'4 quality. The first objective is to provide the following.

[Means for solving problems]

In the image forming method which is the first invention of the present invention, toner is attached to the entire surface of the transferred image forming range of the I/toner carrier, and then the toner is placed at the position n of the substrate V corresponding to the image to be formed. It is characterized by comprising steps of reducing the adhesion force of the toner to the toner carrier, and then transferring the I-toner whose adhesion force has been reduced to a recording carrier to form an image. shall be.

The image forming apparatus, which is the second aspect of the present invention, includes a toner-bearing member, a toner-adhering mechanism, etc., which adheres toner to the transfer image forming area of the groove-carrying member, etc.
J. A transferred image forming mechanism that reduces the f・1 adhesion force of the toner at the position of the transferred image corresponding to the image to be formed on the 1-)-carrier #1 body, and 11 adhesion force. The present invention is characterized in that a rolling stone is used to transfer the toner located at the position of the cover plate 77, which reduces the amount of the toner, onto the recording medium.

[For production]

By using the image forming apparatus, which is the second intermediate IJ of the present invention, in accordance with the image forming method of the first invention, the printability of 9 items 1 is reduced to 1 under high FJr image resolution. be done.

]・Toner (4) The toner is adhered to the plate mapping area of the toner carrier by the toner 414, and then the transferred image forming mechanism applies the toner to the area corresponding to the image to be formed. Transfer!! The GI ZJ force of the toner at position n of 1! is reduced to the toner carrier, and then transfer: The toner whose adhesion force is reduced by °C is transferred to the recording 1!1 body. Then, an il! image with high M image resolution is formed on the record carrier.

〔Example〕

Hereinafter, embodiments of the present invention will be disclosed with reference to FIGS. 1 to 3.

FIG. 1 J3 and FIG. 2 show an embodiment of the image forming apparatus according to the second aspect of the present invention.

FIG. 1 shows the rest of this embodiment, in which an endless OPC belt 21, which is a type of photoreceptor, is used as a toner carrier.
is used. This OPC belt 21 is supported by small rollers 22, 22, driving loaves 23J3 and an optical writing head 24 (112) from the back side, and is moved by a driving roller 23 in the direction of the arrow in the figure. That's it
C5 Other components are arranged around this oPC bell [21.

Zunawara, oPC Bell! On the upstream side of the optical writing head 24 with respect to the traveling direction of ~21, toner is applied to the entire area of the transferred image forming area on the surface of the OPC belt 21 (=16
Le+-Li-I4'+”: 15.l! Ji°11
25 has been established.

Honhon real time J3 ゛(ha, ト)°−(J tear old: Ii25
is formed by a charger 2G and a developer 127, which are arranged in the order of the direction in which the OPC belt 21 travels. -h
'7) '::Siden:E'+ 26 t, L Or)C
Hell h 21 (r) The surface is charged with a total 1F potential of = 10 na, and the other current ((: Do 27 is the surface iσI of the OPC belt 21, which is positively charged with a charge of f1 (charged with Q). The toner is rejuvenated by a factor of 1 due to the Coulomb forces of both sides.

Iζ, light, 11 included head 2/I is development 1 27
The surface of the OPC belt 21 is uniformly coated with the OPC belt at the back of the tonneau, which is located at the position of the transferred image corresponding to the formed uneven image. An example of a cavity transfer image forming manner that reduces the force applied to the OPC belt 2 as shown in Fig. 2m.
It is provided in close contact with one side of No. 1. The optical writing head 2/I of this embodiment has the mark 'J' Ji? LED light emitting part that emits light in response to the current time 9
Fiber plate 1 connected via bright resin 3o
・Consists of 31, and the fiber plate 31 has an LED 28
Directly direct the light emitted from the IHN toward the OPC belt 21.
7 optical fiber IT32 and future fiber group 32
The surface of the optical fiber 32 and the protective glass 33 is formed by a protective glass 33 and 33 that protect the optical fiber from both sides. l
! It has a mirror-finished curved surface to reduce resistance. On the other hand, the OPC belt 21 is shown in FIG.
In other words, there are 14 transparent base films 34, and optical writing heads 2/I etc. are mounted on the surface side of the base films 34.
Transparent resistance to learning 1'l! The abrasion layer 35 is formed, and the surface of the base film 34 is exposed upward to the ground side. A 1-17 rear intervening layer 37, which generates a negative potential QtI rear C, is laminated in this order, and this Q1? On the surface side of the generation layer 37,
The surface portion is charged to a positive potential by the charger 26, and a scratch is generated in the sharpness generation layer 37! I rear C
A carrier transport layer 38 is laminated thereon which causes the carriers to migrate toward the surface portion.

In addition, in this embodiment, the roller 75' 39 is opposed to the 9-fold head 2/l from the side of the OPC belt 21, and separated from the surface of the 01) C belt 21 by a predetermined distance. It is set up. This transfer device 39do0[]CbeC
21 belts are passed through the terminal (/I).

Then, this transfer device 39 transfers the transferred image to the OPC belt 21 at the position t of the transferred image (J?17) by the exposure n degree of the optical head 24. It's [j
is electrostatically attracted and transferred onto the paper 40 to form a toner image on the paper 40. In addition, the transfer device 39 and the charger 2G
On the front side of OPC bell l-21 (7), there is an OPC
f)'v h 21 U) ic h In order of direction, OP
Apply a positive electric charge to the surface of the C belt 21; apply static electricity remover 41 to remove static electricity from the stain, and remove any remaining residual 1 to 4 on the surface of the OPC bell 1-21. A cleaner 42 is provided. Furthermore, a fixing device 43 that fixes the toner image formed on the paper 40 is provided in the traveling direction of the paper 10 .

Next, the operation of the neck forming device shown in FIGS. 1 and 2 will be explained according to the steps of the first aspect of the present invention.

When a printing command is issued, the drive roller 23 first rotates in the direction of the arrow in FIG. King Dobu (+J) is applied to the entire area of the transferred image forming mechanism.

In other words, the OPC is
The surface of the belt 21 is charged with i[iO], and then this belt ? The upper part passes through and covers the next current aI device 27 part 1,
The toner T which has been charged to a negative potential is uniformly deposited on the toner T (4).The state of this toner T (4) deposited can be further explained with reference to FIG. The surface portion of the Aro carrier transport layer 38 is charged +i326 [1
The retoner T is attracted to the carrier transport layer 38 side by the Coulomb force between this surface portion and the toner T having a negative potential, and the carrier transport layer 38 is It is evenly adhered to the surface. The toner T adhered to the surface of the carrier (v transport layer 38) is formed into a single layer or several layers (in this embodiment, two layers).

Next, when the groove 1 part that has been cut on the surface of the or"c belt 21 in the 'rlL row reaches the part of the head 2/I including the light J1, which is the transferred image forming mechanism, , printed piece 1
In order to form a transferred image according to the content of the instruction, light H1 is selectively directed from the head 24 to the OPC belt 21.
Light is transmitted through the light. However, light 2: included head 2/I
The light generated by L[r) 28 of the transparent resin 30 and J:bright light? Light enters the interior from the wear-resistant layer 35 of the OPC belt 21 through the fiber group 32, and enters the inside of the OPC belt 21 through the arrow Q1 in FIG. : Pass through the base film 34 J3 J: and electrode 3G in order to reach the layer 37 of the rear starting point A1), and transfer the transferred material ((: of the surface forming the : I-P A7). Generation layer 37
to expose. In this −1iy rear generation layer 37 (13, a negative potential key 1#s1]0 is generated from the part exposed to light, and then a negative potential is generated within the next key V transport hη38. The key 1/relay C and the positive electric charge on the surface attract each other and move in opposite directions, and are electrically neutralized. When the positive potential charge on the surface is lost, the Coulomb force that causes one toner T to be deposited on that part is lost, and the toner T in this part becomes a transferable image. On the other hand, in the unexposed area, a 1 minute larger force is still applied to the surface of the carrier A7+2 feeding layer 38.In this way, the light is In exposing at 24, a transferred image consisting of toner particles whose adhesion to the OPC belt 21 is reduced by 1 is formed in the groove 1 portion of the surface of the OPC belt 21. However, This transferred image is a high-resolution image for the first time.

Accordingly, in this embodiment, since the transfer 77 39 is provided facing the optical 11. Once formed. %, due to the positive bias voltage of the transfer device 39, the tono-T° of the transferred image portion adhering to the surface of the transfer layer 38 is
The toner image is sucked toward the transfer device 39 and transferred onto the surface of the paper 4o in the middle, resulting in a toner image. The tonneau image formed on the f-bar 40 is the OPC held 21 (1):
l: +lIJ i/? Since the image to be transferred formed by the transfer image 38 and the resolution b is transferred as it is, the resolution of the image becomes extremely high.

After that, the paper 40 is peeled off from the OPC belt 21 and sent to the fixing machine 43, where the 1st image is fixed in a regular manner by the fixing machine 43, and then the paper 40 is separated from the OPC belt 21 and sent to the f1 tray (L!
11'') One sheet is placed on top.

-: Transfer: Passed the S39 portion. PC bell 1~2
The charge is removed while passing through the static eliminator 41 section, and any residual condensation remaining on the surface is cleaned while passing through the cleaner section 742. It is preferable that the toner collected by the creep 42 is sent to the phenomenon drift 27 and reused.

In this way, in this embodiment, in J3, it is possible to form an image with extremely high M image resolution on each sheet of paper 40.

In addition, toner is applied to the 24 sides of the oPC belt j.
Since it is now 7 years old, the various precisions required for the developing device 27 are reduced by one point compared to the conventional example.

In addition, in this embodiment, in J3, optical 11. ) The transfer head 24 is arranged to face the transfer head 24, and the formation and transfer of the image to be transferred are performed (almost at the same time). On the other hand, the OPC belt 21 is separated toward the downstream side in the direction of the regressing hole, and a poetic interval is established between the formation of the Φ surface and the transfer) bJ,
stomach.

FIG. 3 shows another embodiment of the optical head 24.

The light of the tree fruit egg j: The head 24 includes a liquid crystal sillette)
A seven-ray head (hereinafter referred to as an I-CS head) 44 is used to record light onto the PC belt 21. 1, that is, the light emitted from the source 45 consisting of a normal lamp tongue enters the interior through the light guide 4G of the l-CS head 71/I. After that, the incident light passes through the protective glass 47, and then passes through the LC8l? Transparent electrodes on both sides of the 48/19. The light passes through the liquid crystal which has been selectively turned on by the T electric 1i11 to /19, and then passes through the transparent protective layer 50 made of adhesive and the light filter 52 of the Fufui Bubbles 1 and 51. The light passes through the ○PO belt 21 in order and is prevented from entering into the ○PO belt 21, where it is used to form a transferred image in response to a printing command. Fui bubble 1・
At 51, the optical fiber 52 is sandwiched and cooled by protective glass 53 + J3 on both sides of the core, and at b, the optical fiber 52 is held and cooled by protective glass 53 +
3.53○ It is in contact with the PC belt 21 for 1h, and 1, L is a mirror-like curved surface.

In addition, the light shown in Figure 2 and Figure 3 includes spatula 1; 2.
4 is each OPC bell!・Touch 1 and U on the S-J side of 21; the light is set to be U-in, but light;
If you look at the back of the page, you can see that every 11 minutes includes 21 lights. In addition, in both embodiments, b transparent t
(Rules 36 and 49 are used, but these have an ri of 0.
C'IJ instead of a semi-bright electrode made of aluminum + i thin film of 1 μ7rL or less and through which the exposure light passes for 1 min.
J, yes.

In addition, Hikari II included Mihet 2 /l foPc Hel h 2
1, the surface of the rear transport layer 38 is exposed to light to remove the static charge, and the surface of the rear transport layer 38 is exposed to light to form a covering plate 75', 73(J'). In this case, the transfer error 39 will be provided downstream of the head 24 including the light 714 in the direction of movement of the oPC belt 21.

Furthermore, in this case, toner 1 ■ ○PC bell 1 ~ as leave
21, an ordinary photosensitive drum can be used.

In each of the above-mentioned implementation files, an OPC belt 21 was used as a rest for 1 to 2, but an electrostatic belt and
: and the electromagnetic belt toner 1rl 1. ' + rest, and form transferred images electrostatically and electromagnetically from the back side of each belt;

Moreover, the present invention is based on the above-mentioned name/It! It is not limited to ifA, and the size can be changed as necessary.

[Effect of investigation]

In this way, both r9 forming method J3 and apparatus of the present invention are 11
Since it is made up of 100 tA and acts at a high altitude flQ degree, it is possible to form 1y of 101 tA at a high altitude, and it is possible to apply a high amount of printed cap.

4. f in the drawing! ! lkona 1'J (Kirito 1 diagram J) J: Bibushi 2 diagram [, ii of Josui invention! An embodiment of the li-forming equipment is shown. Fig. 1 is a block diagram of the body, Fig. 2 is a front view of the head including 1.1 light Jη, and Fig. 3 is a light:
Another example of the embedding head is shown in a top view, and FIG. 4 is a complete body diagram showing a conventional example.

21...OPC belt, 24...Y; head including I7, 25...1.J゛-E1? 'I Organization, 26...
・Charger, 27... Yuguchi statue stone, 28 ・L r f),
32.52-...Light 7774 Haj, Y, 37...-
4-Vsu1Akogyufu, 38...:1. Auction 11 transport layer, 3...transition? i device, /10... for (,41...
・Static eliminator, /12...Cleaner, 43...Constant j°1
vessel, /I/l...LCS head, /15...brother's wife,
48...ICSRel.

1i　K*person agent　中　R Shun　　Figure 1 ■ Figure 2 Figure 3 2 guns Figure 4 only

Claims (1)

[Scope of Claims] 1) Toner is attached to the entire surface of the transfer image forming area of the toner carrier, and then the adhesion force of the toner to the toner carrier at the position of the transfer image corresponding to the image to be formed is applied. An image forming method comprising the steps of reducing the adhesion of the toner, and then transferring the toner whose adhesion has been reduced to a recording carrier to form an image. 2) The toner carrier consists of a photoreceptor, and after uniformly charging the transfer image forming area of the photoreceptor, toner is attached to the entire area by Coulomb force, and then the toner is formed on the toner carrier. The position of the transferred image corresponding to the image to be transferred is exposed to light to reduce the Coulomb force between the toner and the toner carrier at that position, and then the toner at the position of the transferred image where the Coulomb force has been reduced is electrostatically removed. 2. The image forming method according to claim 1, wherein the image is formed by suctioning the image onto the recording medium and transferring the image to the recording medium. 3) A toner adhesion mechanism for adhering toner to the entire surface of the toner carrier toner image formation range, and a toner adhering mechanism located at the position of the transferred image corresponding to the image to be formed among the toner adhered to the toner carrier. An image forming apparatus comprising: a transferred image forming mechanism that reduces the adhesion force of toner to the toner carrier; and a transfer device that transfers the toner at the position of the transferred image whose adhesion force has been reduced to the recording medium. 4) The toner carrier consists of a photoconductor, the toner adhesion mechanism consists of a charger that charges the photoconductor, and a developer that attaches toner to the charged photoconductor, and the transferred image forming mechanism attaches to the photoconductor. 4. The image forming apparatus according to claim 3, further comprising an optical writing head that exposes the position of the transferred image to reduce Coulomb force between the toner and the photoreceptor.