JPS5995777A - Image display device - Google Patents

Abstract

PURPOSE:To provide the relation of position suitable for the formation of an image with a small clearance between a belt contact plate of an image forming section and a developing position by providing at least one of a belt support or a developer possible for being retrogressed from a route of the belt. CONSTITUTION:The chain 14 of a belt support has ring plates 14a, 14c. The developer 30 is biased counter clockwise by a spring 56 normally. When a thick part of the belt comes to the vicinity of a roll 7, a roll provided to a ring plate 14b is brought into contact with a slope of a developing image side plate 40. The developer 30 is revolved clockwise around a fixed shaft 53 attended with the movement of the chain 14 and shunted from the developing position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides image information that is converted into an electrical signal that is calculated or read out from a computer, image reading device, etc., or that is stored as a sonto copy on a magnetic tape or the like. Regarding an image display device M (image display device) used as a terminal device or league device that reproduces and displays a visible image, or an image monitor device in office automation equipment such as a copying machine, or other image-related equipment, More specifically, it relates to the structure of an image forming section of an image display device.

In general, CRT display devices and liquid crystal display devices have been put to practical use as devices for visually displaying image information converted into electrical signals.

Among these, the former CRT display gray device is currently the most commonly used and highly reliable device, but due to its low resolution, it cannot handle small characters used in newspapers and magazines, especially kanji. It is difficult to display characters with a large number of strokes in their original size, so they are enlarged to make them easier to decipher. However, the number of characters that can be displayed on the screen decreases in inverse proportion to the magnification rate, and the amount of information per screen is small. Furthermore, when the screen is flickering, there are problems such as eye strain.

On the other hand, the latter liquid crystal display device is a display device that has recently been put into practical use, but like a CRT display device, it does not have sufficient resolution, and large screen devices are difficult to produce and expensive. There is a problem that it gets worse.

Therefore, the present applicant has previously proposed an image display device as a third image disc storage device that does not have the above-mentioned drawbacks.

This image display device consists of an image-bearing belt whose outer surface is coated (vapor-deposited) with a photosensitive agent, and which is installed across multiple rollers.While the belt is rotated, lasers, LED arrays, etc. are installed inside the belt. A latent image is formed using the exposure means, and at the same time as the exposure, development is performed using toner from the outside of the photoreceptor corresponding to the exposed area, and the image information converted into an electrical signal is visualized and displayed. It has this basic structure.

Since this image display device reproduces and displays image information as a toner image as described above, it has excellent resolution, the image is easy to see, large screens can be manufactured at relatively low cost, and it has high reliability. It has the feature of being a high quality device.

By the way, since it is difficult to manufacture an image carrying belt that is stretched around multiple rollers as an endless belt coated with a photosensitive agent from the beginning, it is generally made of a long belt. Usually, a sheet-like substrate is coated or vapor-deposited with a photoreceptor, cut into appropriate lengths, and the ends are glued together to produce an endless shape. However, when using pelts manufactured by such a method, it is generally unavoidable that the belt joints are thicker than other parts.

In particular, an elastic member is provided at the joint part for the purpose of absorbing errors in the circumference of the endless belt, and this elastic member is used as a connecting member to connect to a chain rotating in parallel to prevent the belt from meandering. In such a case, the thickness of the elastic member tends to be considerably large.

On the other hand, since this image carrying belt performs development almost simultaneously at the latent image forming (writing) position, it is necessary to pass through a small gap in the same area, and for this reason, the belt is connected The fact that the belt is partially thick poses a problem in terms of rotation of the belt. The need for the belt to pass through such a small gap means that in order to accurately write the latent image and stabilize the image quality, a transparent material must be installed inside the belt track at the latent image forming position to keep the belt track surface properly flat. Two advantages are that a belt contact plate is preferably disposed, and a developing device is disposed outside the belt orbit of the image forming section.
It can be understood from this point.

From the above points of view, the present invention provides that, as the belt rotates, the image forming section reduces the amount of fl between the belt contact plate and the developing device.
J] To provide a structure of an image forming section in an image display device in which a positional relationship suitable for image formation can be established with a gap, and the belt can be moved back in a direction away from the thick belt.

The gist of the present invention is to provide an image carrying belt that rotates on a predetermined orbit, a tee/or belt that rotates synchronously and parallelly on both sides of the image carrying belt in the width direction, a body, and an outer surface of the image carrying belt. In the image display device, at least one of the belt support and the developing unit is provided to be retractable from the belt track, and a part of the belt is A guide/operating section for guiding the retractable member backward is provided, and the guide/operating section
The image display device is characterized in that the operating section rotates in parallel with the thick portion of the image carrying belt.

It goes without saying that the transparent plate may be similarly retracted together with the developing device.

The present invention will be described below based on embodiments shown in the drawings.

1 to 3 show the entire image display device, with FIG. 1 being an external perspective view, FIG. 2 being a sectional perspective view, and FIG. 3 being a longitudinal sectional view. In the figure, 1 is a vertical device outside the device, 2 is a display image viewing window that is large and open on the front panel of the exterior casing, and 3 is a display window with the lower part of the front panel protruding forward. The operation panel 4 is placed on the top surface, the display window glass 4 is placed in the window hole 2, and 5 and 6° 7.8 are two axes each at the top and bottom of the exterior housing 1, which are mutually aligned in the left and right direction of the exterior housing. Four endless belt type photoreceptor suspension supporting rollers are disposed parallel to each other and freely rotated in any number of bearings; 9 is an endless belt type photoreceptor (9) suspended and supported by the four rollers; (hereinafter abbreviated as belt).

At both ends of the supporting rollers 5.6, 7.8 (d, on the same axis as the rollers, there are sedge rocket wheels 10, 11° 12.13
(The rear end side is omitted) are provided, and a chain 14 that rotates in parallel with the belt 9 is suspended from these tin rocket wheels. The chain 14 and the belt 9 are connected by a connecting means using an elastic member, and this point will be described later.

The belt 9 has, for example, a base layer of a transparent sheet such as a polynisdel sheet, and has a very thin layer of metal vapor-deposited on its outer surface to provide conductivity while substantially maintaining transparency. Photosensitive material layer (photoconductive layer) such as CdS on the side
It is entirely flexible and is suspended and supported by the four rollers mentioned above with the photosensitive material layer side facing outside.

Of the four rollers, roller 5 is used as a driving roller and the rotational force of motor M (Fig. 3) is transmitted to this roller, and at least one of the other three driven rollers, for example roller 6, is , is provided as a belt tension roller to give tension to the suspended belt, and J drive roller 5
is the motor M! 7. The above-mentioned suspension belt 9 becomes wavy and sagging due to being rotated in the counterclockwise direction in FIG.
It is designed to rotate counterclockwise without slipping. With this rotation, the outer surface of the belt between the rollers 5 and 8 (the outer surface of the belt on the tension side) moves from the bottom to the top and passes through the display image viewing hole 2 part of the front panel of the exterior.

Reference numeral 24 denotes a laser beam scanning type image exposure device fixedly disposed inside the suspension belt 9, and includes a semiconductor laser oscillator 25. Polygon mirror scanner 26, fθ lens 271
A horizontally elongated glass/glass stick is placed in pressure contact with the inner surface of the track of the tension belt section between the reflecting mirror 28 and the two belt suspension support rollers 7.8 at the lower part of the inside of the device exterior cylinder. It consists of a transparent plate 29 such as.

This image exposure device 24 oscillates an intermittent laser beam L from a semiconductor laser oscillator 25 toward a polygon mirror scanner 26, which corresponds to time-series electric pixel signals output from an electronic meter, image reading device, etc. The laser beam L incident on the suchiyana is swung in the belt width direction and is incident on the inner surface of the belt portion between the rollers 7 and 8 on the path of fθ lens 27→reflector 28→transparent plate 29, and the inner surface of the belt portion is The laser beam is scanned in the width direction. Then, this laser beam scanning is used as a main scan, and the rotational movement of the belt 9 is used as a sub-scan, so that the image of the belt 9 is exposed by a laser beam from the inner surface of the belt.

Reference numeral 30 denotes a toner developer disposed close to the outer surface of the track of the belt portion between the rollers 7 and 8. The configuration of this toner developer 30 will also be described later together with the connection configuration of the belt 9 and the chain 14.

Note that the transparent plate 29 (belt support) disposed on the inner side of the belt portion between the laser beam scanning exposure section and the start row 27°8 is slightly downwardly aligned with the common tangent to the lower side of the roller 7.8. The reeds are arranged to protrude and come into suppressed contact with the inner surface of the belt, and the end surfaces 29□ and 292 of the transparent plate 29 on the belt rotation side and the belt rotation rotation side allow the belt to smoothly contact and move. It is chamfered and rounded like this.

The function of this transparent plate 29 is to prevent the belt 9, which is a photoreceptor, from rotating and moving, such as waving and vertical movement, and to prevent contact with the developing brush (brush-like spikes of developer formed by a magnet) of the developing device 16. This is to prevent the vertical vibration of the belt 9 caused by the vibration, maintain the exposure position constant, and improve resolution.

When the operation panel 3 is operated to call up the image information, set the display position, etc., and input a display start command, the rotation of the motor M causes the belt 9, which is the photoreceptor, to move at a predetermined speed. rotation begins.

Further, laser beam scanning exposure of designated image information to the belt 9 by the exposure device 24 is started on the inner side surface portion of the belt between the rollers 7.8. A developing device 30 is disposed on the outer surface of the belt in the exposure section, and the toner acts on the outer surface of the belt at the same time as exposure, so that a toner image corresponding to the exposed image is formed on the outer surface of the belt 9. be done. As the belt rotates, the toner images sequentially formed on the outer surface of the belt are rotated from bottom to top to the display image viewing window hole 2 on the front panel of the housing, and placed in the specified window hole range. When the belt 9 moves 8, the rotation of the belt 9 is temporarily stopped. As a result, an image is displayed on the window hole 2 and is visible through the display window glass 4. Next, the belt is rotated again] When the belt is rotated again by Eisaku, the next display image moves to the window hole range position and the next screen is displayed.

After being displayed, the toner image on the outer surface of the belt reaches the toner developing unit 16 as the belt rotates, where it is cleaned and removed by a developing brush, and immediately after this cleaning, it is stored again and subjected to simultaneous exposure and development. A new toner image is then formed.

Now, as can be understood from the explanation of the above configuration, especially from the description in FIG. 3, a latent image is written on the belt 9 by scanning a laser beam, and the position (
In the image forming section (hereinafter referred to as the image forming section), the gap between the transparent plate 29 that contacts the inner surface of the belt track and the developing device 30 that is disposed close to the outer surface of the belt track is quite small. However, since the joint portion of the belt 9 is thick, passage becomes a problem. That is, although the chain 14 (or a ■-shaped belt or the like may be used) is provided primarily to prevent meandering of the belt 9 or to be used also as a drive port transmission means, uneven rotation of the chain 14, It is desirable to connect the belt 9 through an elastic member in order to prevent the belt 9 from flapping due to the transmission of pitch flyers, and from the viewpoint of manufacturing the belt 9 itself, it is desirable to connect one or two flat strips with an elastic member. It is often joined as a joining member. For example, one of the many link plates 14a forming a chain of opposing chains 14 is provided with protrusions 15 facing each other and extending in the direction of the belt 9, and connecting these opposing pairs with a pair of raised parts 15, 15, the elongated flat plate stay 16 is taken up by loosely fitting the pin 17, and on the other hand, an elastic member 18 is fixed in the middle part of the stay 16 so as to wrap around it, and from this elastic member 18 The ends of the belt-type photoreceptor are bonded to the thin plate portions, which extend toward the front and rear in the direction of belt movement and have sufficient elasticity. Therefore, the stay 1 of the elastic member 18
The portion 18c that wraps around the stay 16 becomes considerably thicker, and it is unavoidable that the portion 18c that surrounds the stay 16 will also become thicker in other configurations that do not use the stay 16, although there may be differences in degree.

As already mentioned, it is difficult to pass such a thick part of the belt through the image forming position, and it may damage the developing device or hinder smooth rotation of the belt. That's right.

Therefore, in this example, the following configuration is used so that when a thick portion of the belt passes, the developing device 30 is retracted from a position opposite to the belt track by the chain 14.

First, referring to the structure of the chain] 4 side, link plates 14 a l + c that connect with the stay 16
Connects a rectangular link grate 14b with rounded corners adjacent to the front side of the chevron 4 f 140 rotation direction, and further connects a normal link 7° rate 14c to the f4 pin 1
It is connected to 9.

The upper end of this square link plate 14b (orbit inner side j1
“Ai) 20 is link route 1.4 a, 14
The ends in the same direction of c are also higher, and two rollers 23 are rotatably provided at the lower end (outside end of the raceway) by pins 22. The outer periphery of the roller 23 protrudes from the lower end 21. The lower part of the outer periphery of the beaded roller 23 is provided so that the bent portion of the protrusion 15 is located at a position that protrudes from the lower surface of the bent portion and the lower surface of the thick portion 18c of the elastic member 8. On the other hand, regarding the configuration of the developing device 30, the developing device 30 is shown in FIGS. 5 and 6.
The developing row 231 shown in the figure. A motor 50 that rotates the magnet 32, which is one of the members that make up the developing roller 31. motor 5
The timing belt 52, etc., which transmits the rotational force of 0 to the nori 36 which is pivoted to the red sea bream 7to 32 through the drive pulley 51, is housed as a unit in a case such as a box, and this case is It is rotatably supported by a fixed shaft 53 fixed to a fixed component such as an outer box of the apparatus, and a spring 56 normally holds the developing roller 31 portion in a predetermined position relative to the belt 9 in the image forming section. The arms are placed in a stationary position with a small gap between them.

According to the configuration, the developing device can be retracted from the arm pair position with the belt 9 (development color jBi) by applying a pressing force to the portion on the side of the developing roller. In this example, the rectangular link grate 14. of the chain 14 described above is responsible for the pressing force of this evacuation and retreat.
In other words, this rectangular link plate 14b rotates in parallel with the thick portion 18c of the belt 9, and the current time is 1 s! It serves as a guide and operating part that moves the vessel backwards.

The configuration of each part of the device, including the detailed structure of the developing device 30, is as follows.
I will explain the operation in detail.

In the developing device 30, a developing roller 31 that supplies toner to the belt 9 is connected to a cylindrical magnet 32, a rotating shaft 33 passing through the center of the developing roller 32, and a sleeve 34 provided outside of the magnetoresistive magnet 32 in a non-contact state. Of these, the magnet 32 is provided in a fixed and integral relationship with the rotating shaft 33, and in a rotatable relationship with the sleeve 34 via a hall bearing 35.

Still at one end of the rotating shaft 33 (the left end in FIG. 6),
A driven groove 36 around which the timing belt 52 described above is suspended is fixedly provided.

The sleeve 34 is provided with a ring-shaped 7-run section 37 having a slightly larger diameter at both ends with respect to the cylindrical intermediate shaft part 34a (development surface), and extends outward in the axial direction from both ends. On the other hand, support shaft portions 38 and 39 are completely formed. These support shaft portions 38 and 39 fit into the left side plate 40 and the right side plate 41, and in particular, the support shaft portion 3 on the right side of the figure.
9 is fixed with a set screw 42. A bottom plate 43 is integrally installed between the left and right O side plates 40 and 41,
A hopper 45 for storing toner 44 is formed.

The side plates 40, 41 and the bottom plate 43 constitute a kind of box-shaped case, and a motor 50.4 for rotating the magnet 32 is provided. A timing belt 52, etc., which transmits the rotational force of the motor to the glue 36 via the drive glue 5] is housed in this case, and the entire case includes the developing roller 3, which passes through both the left and right side plates 40 and 41.
It is rotatably supported by a fixed shaft 53 parallel to 1.

In this example, the fixed shaft 53 is fixed as follows. A developing tray that can be pulled out from the device exterior casing l in the direction of arrow A in FIG. It is fixed to a support plate 55 fixed to the side. Development side plate 40
．． 41 and developing plate 54. A tension spring 56 is suspended from JJ to apply a rotational force in the clockwise direction of FIG. At 37, align it with the transparent plate 29,
A predetermined gap d is maintained between the belt 9 and the sleeve 34 to maintain an aligned relationship during development. Note that it is practically desirable that the entire case of the developing device 30 be provided in a weight balanced relationship such that a rotational force is generated in the counterclockwise direction in FIG. 8 with the fixed $+I+ 53 as the center.

In accordance with the above configuration, the developing device 30 normally has a d.
Due to this action, the developing roller 31 is biased in the counterclockwise direction υ in FIG.

That is, in this example, as shown in FIG.
7.37 spirally contacts the transparent plate 29, thereby forming a gap between the circumferential surface of the intermediate shaft portion 34a of the sleeve 34 and the transparent plate 29 by the height d of the flange portion 37.37. The belt 9 rotates between the flange portions 37 and 37 while contacting the transparent plate 29.

And if we assume that this transparent plate 29 is fixed,
In order for the thick joint 18e of the belt 9 to pass, the developing roller 31 must be lowered downward in FIG. 8 in order to widen the gap d (
The side plates 4.0 and 41 serve as a case for supporting the sleeve 34.
is pushed down by a special link plate 14b of the chain 14.

FIG. 8 shows that the developing device 30 is
), when the belt joint 18 moves close to the bottom surface of the roller 7 while the belt 9 is rotating, the rollers 23 provided on the link grate 14b move. First, it comes into contact with the slope of the developing side plate 40, 41. As the chain moves, the developing unit 30 rotates in the clockwise direction in the figure around the fixed shaft 53 and retreats from the developing position.

In this way, while the developing device - Maru'' - is retracted from the developing position, the stay 16 provided on the link grate 14a adjacent to the link route 14b and the elastic member 18 fixed to this stay move to the image forming section. Pass through. The link loop 14b that passes through the image forming section is the developing side plate 4.0, 4.
It is along the slope of No. 1.

The developing device 30 is returned to the image forming state, and the sleeve 34 is
is the development position where it comes into contact with the transparent plate 29 (the position shown in FIG. 6)
It returns to .

As is clear from these relationships, the developing device 30 has its side plates 4.0. '41 does not contact the normal link route of chain 14, and is a special link gray) ], 4
b (guiding/operating part for retracting the developing unit) to generate retracting movement against the spring force, and for this purpose, a special link grade 1 on the chain 14 side
4b, the shape of the collochoid surfaces of the side plates 4.0 and 41 on the side of the developing device 30, etc., are not limited to the illustrated example, and may be any shape that produces the above-mentioned series of cohesion and movement relationships. It's good.

The developing action is obtained by conveying the magnetic L-ner 44 into the gap between the photosensitive belt 9 and the sleeve 34 by the rotation of the magnet 320 when the belt 9 closely slides on the lower surface of the transparent plate 29. In this case, in the example shown in FIG.
In addition, the inner distance L2 between the flange portions 37 provided at both ends of the sleeve 34 may be narrower, and the magnetic toner 4 attracted and conveyed on the sleeve surface by the magnet 32 may be narrowed.
4 is restricted only to the range of width L3 where the lines of magnetic force have an influence, so that toner does not go around inside the photoreceptor belt 9.

In the above description, the transparent plate 29 is of a fixed foot type, but the transparent plate 29 may be retracted in place of the developing device, or both of these may be retracted as in this example. It's okay.

In this example, as shown in FIG. 7, the transparent plate 29 is fixed to the lower end of the machine frame 46 whose inside is hollowed out, and the front and rear ends of the machine frame 46 in the direction of rotation of the belt. is provided with a forearm 47 and a rear arm 48 whose lower sides (sides in contact with the belt 9) have circular arcs, and a compression spring 49 that presses the machine frame 46 downward is in contact with the upper surface of each arm. . Then, while the chain 14 is moving, the upper end 20 of the link grate 14b comes into contact with the arms 47, 48 of the machine frame 46, pushing up the transparent plate 29 provided on the lower surface.

FIG. 9 shows another embodiment of the present invention, in which support shaft portions 38 and 39 extending from both side ends of the developing roller 31 are provided with a gap between the intermediate shaft portion 34a of the sleeve 34 and the transparent plate 29. d is rotatably supported by rollers 57 and 58.

59.60 is the spacer 59. inserted between the roller and the side plate.
It is 60. That is, in the case shown in FIG. 6, the flanges 37 and 37 formed on the sleeve 34 are fitted into the transparent plate 29 to maintain the gap d.
In this example, the flange portion 3 is integrated with the sleeve 34 that does not rotate.
Instead of 7, rotatable rollers 57 and 58 were used. In this case, the rollers 57 and 58 rotate little by little due to vibrations when the developing device 30 and the transparent plate 29 are opened and closed, and the contact portion with the transparent plate 29 moves, causing local wear of the circumferential surface of the roller. This has the effect that the gap d can be maintained for a long period of time.

In addition, in FIG. 9 explaining this example and drawings showing other embodiments described below, members common to those shown in FIGS. 1 to 8 are designated by the same reference numerals. The explanation has been omitted.

10 and 11, in place of the transparent plate 29, two thin exposure rollers 61 and 62 form a slit through which the laser beam L passes, as a belt support that defines the development and exposure position of the photosensitive belt 9. 6 is a diagram showing another embodiment of the present invention in which the exposure rows 261 and 62 are in contact with the inner surface of the belt 9, and the end portions are connected to the machine frame 6 through a bearing 63.
4, and is provided so as to abut rollers 57 and 58 shown in FIG. 9, which maintain a gap between the exposure roller and the developing surface 34a near the end. In this case, when the exposure roller 61.62 rotates as the belt 9 moves, the rollers 57.58 in contact with it will follow and rotate, which effectively prevents uneven wear of the rollers 57.58. This is more effective in maintaining a constant gap d.

FIGS. 12 and 13 show another embodiment of the present invention, in which the rollers 57 and 58 on the sleeve side for maintaining the gap d shown in FIGS. 10 and 11 are replaced with similar ones. Coro 67.
68 are provided in the exposure rows 265 and 66. In this case, the exposure rollers 65 and 66 are supported by the machine frame 70 via bearings 69, but there are rollers 67 and 68 at the end of the developing sleeve 71.
are in contact and maintain the required distance. Gap roller 67.68
can rotate freely relative to rollers 65,66.

FIG. 14 shows that in the embodiment shown in FIGS. 10 and 11, needle-shaped styluses 72 are arranged in rows of 2,000 to 3,000 styli in the axial direction on the surface of the developing sleeve 34, and each stylus 720 is individually attached to an image generator. This shows an embodiment in which toner 44 is deposited on the surface of an image bearing belt (insulating belt) 73 by receiving a signal to form an image, and the latent image forming plate and the developing method are shown. Although this is different from those in each of the embodiments described above, a structure in which the developing device (in this example, further including the stylus 72) is provided so as to be retractable relative to the image carrying belt 73 can be similarly adopted. In the case of this example, the gap between the tip of the stylus 72 and the belt 73 is usually about 30 μm to 500 μm, so the need for retraction for the thick part of the belt becomes even greater. ing.

As described above, the structure of the image forming section of the image display device according to the present invention allows stable image formation when displaying an image using the four-fold endless belt-like image bearing belt. This method provides a large number of serial numbers from the viewpoint of preventing damage to each member of the image forming section, and its usefulness is extremely limited.

It is also obvious that the present invention can be applied to an image display device of a type in which, after displaying an image, the image is transferred from a belt surface to a transfer paper as necessary.

[Brief explanation of the drawing]

The drawings are for explaining an embodiment in which the present invention is applied to an image display device, and FIG. 1 is an external perspective view of the image display device, FIG. 2 is a sectional perspective view of the same, and FIG. 3 is a longitudinal sectional view of the same. , FIG. 4 is a perspective view showing a part of the structure of the chain, FIG. 5 is a sectional view of the developing sleeve, and FIG. 6 is a sectional view showing the relationship between the developing device, belt, and transparent plate in the developing position. FIG. 7 is a perspective view showing the structure of the transparent plate, and FIG. 8 is a view showing the state when the developing unit is retracted. Figures 9, 10 and 11, 12 and 1
3 shows other embodiments of the present invention, and FIG.
11 and 13 are cross-sectional views showing the relationship between the developing device, belt, and transparent plate (or exposure roller) of each embodiment, and the first
0 and 12 are side cross-sectional views showing the relationship between the developing sleeve, the belt, and the exposure roller, and FIG. 14 is a view showing an example in which a stylus is used to form an a-image. l...Device exterior casing 2...Display image viewing window 3.
...Operation panel 4...Display window glass 5,6,7
．． 8... Hanging support roller (roller) 9... Endless belt type photoreceptor (belt) 10.11.12.13... Sprocket wheel 14... Chain 14a, 14b, 14cm link plate 15...・Protrusion 16... Stay 17... Bin
18...Elastic member 19...Bin 20.
...Lower end 21...Top end 22...Bin 23
...Colo 24...Image exposure device 25...
- Semiconductor laser oscillator 26...Voricon mirror scanner 27...fθ lens 28...Reflector 29...
Transparent plate 2”11292...End face 3°0...
Developing device 31...Developing roller 32...Magnet 33...Rotating shaft 34...Sleeve 3
5... Ball bearing 36... Driven nori 3
7...Flange part 38.39...Support shaft part 40.
41... Side plate 43... Bottom plate 44... Toner 45... Hopper 46... Machine frame 47...
・Forearm 48...Back arm 49...Compression spring
50... Motor 51... Drive nori 52.
・・Timing belt 53・・Fixed shaft 55・
... Support plate 56 ... Tension spring (spring) 57.58 ... Roller 59.60 ... Spacer 61
．． 62...Exposure roller 63...Bearing 64...Machine frame 65.66.
・・Exposure o---y 67, 6 B...Roll 69・
... Bearing 70 ... Machine frame 71 ... Developing sleeve 72 ... Stylus 73 ... Image carrying belt (
Insulation belt) Fig. 5 33 Fig. 6 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12

Claims (1)

[Claims] an image carrying belt that rotates on a predetermined orbit; a chain or belt that moves synchronously in parallel on both sides of the image carrying belt in the width direction; In the image display device, at least one of the belt support and the developer is provided, the image display device comprising: a belt support that contacts and engages with the inner surface of the image bearing belt; and a developer that is connected to the arm with a small gap maintained on the outer surface of the image carrying belt; The chain or the belt is provided so as to be retractable from the orbit, and a guide/operating section for guiding the retractable member backward is provided in a part of the chain or belt, and the guide/operating section rotates in parallel with the thick portion of the image bearing belt. An image display device characterized by moving.