JPS58223160A - Image display device - Google Patents

Abstract

PURPOSE:To prevent invasion of dust and moisture into the inside during cleaning, by using a long flexible transparent sheet material or such an endless belt as a transparent protective plate, and stretching it near the peep window opening of the outside casing of a device freely movably along the surface having a window opening, kept stretched in a plane. CONSTITUTION:A part 40' of a long transparent sheet stretched opposite to the opening 2 of the image peeping window between upper and lower lateral shafts 17, 22 serves as a display window glass. The display image of a photoreceptor belt 9 is observed from the outside through the part 40' of the stretched sheet. When the inner and outer sides of the part 40' are stained, a belt drive roll 5 is rotated, an electromagnetic clutch 27 is turned on by pushing a cleaning start button on an operation panel, and the upper shaft 22 is rotated through a timing belt 28, the sheet 40 is wound up, and a clean sheet is fed onto the window opening 2.

Description

[Detailed description of the invention] 4 (The invention is based on 1) image information converted into an electrical signal that is calculated or read out from an electronic computer Φ image reading device, etc., or that is stored as a digital copy on a magnetic tape or the like. Image information t - Image display device (image display) 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, and other Ryotsu-related equipment. Regarding the mounting [).

Conventionally, CRT display devices and liquid crystal display devices have been put to practical use as devices for visually displaying the enjoyment of drawings by converting them into electrical signals.

Among these, CRT display devices are the most commonly used and highly reliable devices, but due to their resolution, they can display small characters used in newspapers and magazines, especially characters with a large number of strokes such as kanji, as they are. It cannot be displayed in this size. Although the text is rounded and enlarged to make it easier to decipher, the number of characters that can be displayed on the screen decreases in inverse proportion to the enlargement rate - the amount of information per screen is small. Furthermore, if the same image is displayed continuously for a long time, the screen will burn in and the display performance will decrease. Furthermore, if the screen is flickering, your eyes will get tired.

Next, the liquid crystal display device F'i is a display device that has recently been put into use, but like the CR'l' display device, not only is the resolution insufficient, but large-screen devices are difficult to manufacture and expensive. Become.

Therefore, the present applicant previously proposed an image display device using electrophotography as 13 image display devices free from the above-mentioned drawbacks (Japanese Patent Application No. 56-197410-1974).
No. 13). This display device converts image information into toner images and t~
It is reproduced and displayed with excellent resolution and easy to see one image.
A device with a large screen can be manufactured at a relatively low cost and is a highly reliable device.

By the way, regardless of whether the image forming/displaying method is the above-mentioned CRT method, liquid crystal method, or electrophotographic method, this image display device uses a VCl11ii barrier forming display mechanism inside an exterior cylinder with a peephole for displaying images of that mechanism. Display part The lunar surface is exposed to the image viewing window JLK on the exterior tube. [Built-in 1 image viewing angle 3 points are glass, resin plate, etc. ■ Transparent protective layer 1 temporary structure shadow lines are taken and 1 displayed image is visible through the transparent window (hereinafter referred to as the display window) of the picture window. The display window glass serves to protect the internal mechanism by preventing dust, moisture, and other objects from the outside world from entering into the exterior tube of the device.

'1. The display window glass is equipped with optical filtration properties to block harmful and unnecessary light from entering the interior and improve image visibility.

There are also CTs that can provide effects such as preventing fatigue.

However, since the C display image is viewed through the above-mentioned display window glass, the display window glass 1 is the outer surface.

Both internal surfaces must be kept clean and free of dirt. The outside and sides of the display window glass tend to get dirty.

The IC can be more easily removed by wiping the dirt with a clean cloth. Over a long period of time, the inner surface becomes dirty with dust floating inside the device, and the visibility becomes low. If the internal image forming and displaying mechanism is one that displays images as toner images, such as electrophotography, free toner on the surface of the toner moat carrier and floating toner inside the device scattered from the developing section are used to cause damage to the inner surface of the display window glass. is easily contaminated. Therefore, by connecting the display window glass to the window hole of the device exterior tube, for example, by connecting it with hinges and disposing it so that it can be opened and closed freely, the display window glass can be opened when necessary to clean its inner surface. When the glass is opened for cleaning, dirt and dust from the outside world enters the device through the opened window hole. Moisture also enters. There are problems such as making it easy to accidentally touch internal equipment with hands or cleaning tools.

Particularly when the internal image forming and displaying mechanism is of an electrophotographic type, if the external moisture entering the apparatus is high, the characteristics of the photoreceptor will change. It is easy to damage the photoreceptor when it comes into contact with it.

It is an object of the present invention to rationally solve the above-mentioned problems and inconveniences caused by dirt on at least the inner surface of the optical display window of such an image display device.

A detailed explanation will be given below based on an embodiment shown in the drawings.

The illustrated display device is one example of nine devices using electrophotography, and FIG. 1 is an external oblique view, and FIG. 2 is a vertical side view.

1 is a vertical device exterior tube, 2 is a display screen viewing window IL formed in a large opening on the front plate surface of the exterior tube, and A is an operation panel with the front plate OF part protruding forward. board, 4 is window J
L21'C display window glasses 5, 6, 7, and 8 have two axes at the top and bottom of the exterior tube 1, parallel to each other with the axes parallel to the left and right directions of the exterior tube.

In addition, the endless plate type photoreceptor suspension support rollers are individually disposed with freely rotatable VC bearings, and the endless plate type photoreceptor is suspended and supported by the rollers 9Fi No. 4 and F.

This endless pellet type photoreceptor 9 (hereinafter simply referred to as belt) has a base layer made of a transparent sheet such as a polyester T receipt sheet, and a very thin layer of metal is deposited on the outer surface of the photoreceptor (7) to substantially maintain transparency. A photosensitive material 114 such as Cd8 (photoconductive 1
-) and is entirely flexible, and is suspended and supported by four rollers with the photosensitive material layer side facing outward.

Among the four rollers mentioned above, roller 5t - Mog as the core roller as the driving roller! The rotational force M (Fig. 3) is transmitted. At least one of the other three rollers acts as a roller 6ri to apply tension to the suspended belt. As the drive roller 5 is rotationally driven by the morph M in the counterclockwise direction in FIG. 2, the above-mentioned suspension belt 9 rotates counterclockwise without waving, sagging, or slipping. Along with this rotation, rollers 5 and 8M.

The outer surface of the belt (the outer surface of the belt on the 'JlQ side) moves from the bottom to the top and passes through the two display window viewing holes on the front panel of the exterior casing.

Reference numeral 10 denotes a laser beam scanning type image exposure device fixedly disposed inside the suspension belt 9CD, and includes a semiconductor laser oscillator 11. Polygo/mirror scan moon 2°f #v ys 139 reflector 14. 2+ pair A at the bottom inside the device outside the device)
It consists of a horizontally elongated transparent plate 15 made of glass-plastic or the like, which is placed in pressure contact with the inner surface of the stretched base part between the suspension support rollers '7 and 8 at an appropriate angle.

This image exposure device 10i1 electronic needle counter/image reading device [
An intermittent laser beam L corresponding to a time-series electric pixel signal outputted from a semiconductor laser oscillator 11 is oscillated by a borigo/mirror scanner 12. The laser beam L incident on the scanner is swung in the width direction of the scanner and passes through the roller 71 along the path of fθ/z 16 → reflector 14 → transparent plate 15.
Incident on the inner surface of the belt part between 18 [2. The inner surface of the belt portion is scanned with a laser beam in the width direction of the belt. Then, this laser beam scanning is used as a main scanning, and the entire rotational movement of the belt 9 is performed as a sub-scanning, whereby the image of the belt 9 is exposed by the laser beam from the inner surface of the belt.

Reference numeral 16 denotes a toner developing device disposed on the outer surface side of the base portion between the rollers 7118.

The transparent plate 15 disposed on the inner side of the belt portion between the rollers 7 and 8, which serve as the laser beam scanning exposure section, is located between the rollers 7 and 8.
The lower surface of the plate 15 is slightly protruded downward from the common tangent line on the lower side of the plate 15, and is in suppressed contact with the inner surface of the belt. It is chamfered (2) and rounded so that it contacts and moves smoothly.

Also, this transparent plate 15 rotates to move the photoreceptor barrel 9.
0 waves, 1hi downward movement, t. The developing brush of the developing device 16 (
(brush-like blobs of developer formed by magnets)
9) Prevents vertical vibration caused by contact with the lens, and *maintains the light position constant to improve resolution.

Image information is then called up by operating the operation panel 6.

When necessary conditions such as designation of a display position are set and a display start command is issued manually, the rotation of the morph M causes the photoreceptor 90 to start rotating at a predetermined speed.

Further, the exposure device 10 starts scanning and exposing the belt 9 with designated image information using a laser beam on the inner side surface of the belt between the rollers 7 and 8. A toner developing device 16 is disposed on the outer surface side of this exposure section, and the toner acts on the outer surface of the sheet at the same time as exposure, so that toner I corresponding to the exposed image is formed on the outer surface of the belt 9! iigR are formed sequentially. Bej
As the belt rotates, the toner images sequentially formed on the outer surface of the seat rotate from the bottom to the top of the second image peep hole on the exterior electronic screen board and move to the specified window hole range position. Then, rotation of the belt 9 is temporarily stopped. For this, window hole 2
An image is displayed on the screen, and the image is visually recognized through the display window glass 4. Next, when the belt is rotated in an arched manner by the belt re-rotation operation, the next display image moves to the window hole range position and the next screen is displayed. After displaying, the toner image on the outer surface of the belt reaches the toner developing device 16 as the belt rotates, where it is cleaned and removed by a developing brush. In particular, a new toner image is formed.

Various processes and methods for forming toner particles using electrophotography are well known, but as shown in the example device shown in FIG.
In addition to being able to display high-resolution images, the simultaneous exposure to toner application method eliminates the need for corona charging or cleaning means, making it possible to create highly reliable display devices with an extremely simple configuration and less failure and photoreceptor deterioration. Can be configured.

As described above, the system that forms the display image as a toner image and displays the image has better resolution, is easier to see, and is less tiring than, for example, a CRT display device or a display device that uses liquid crystal.

For display images that are required, the addition of a mechanism for transferring the toner image formed on the belt surface to the copy paper surface has the advantage of being able to more easily obtain a hard copy.

The present invention solves the above-mentioned problem of dirt on the display window glass 4 of the image forming apparatus such as the above example. An endless belt material was used, and the long sheet material or the endless belt material was stretched over the image viewing window hole of the device exterior so that it could move freely along the opening surface of the window hole. Alternatively, the long sheet material or endless belt material described above is stretched along at least the inner surface of the transparent protection plate so as to be freely movable. I characterized by
[! The purpose is to use a li image display device.

6 and 4, a flexible and transparent long sheet material 40 is used as a transparent retaining plate, and the long sheet material 40 is attached to the device exterior casing 1.
This is an example of a configuration in which the image viewing window 2 is provided so as to be freely movable along the opening surface of the window.

That is, reference numeral 17 denotes a lower horizontal shaft which is rotatably supported by bearings 1B and 19 in front of and diagonally below the belt-suspending roller 8 on the inside and lower side of the exterior of the device, in parallel with the openings 8; This horizontal axis 1
7, a flexible and transparent long sheet material 40 such as a polyester film is wound into a roll. This elongated sheet material 40 has a width dimension larger than the width of the image viewing window hole 2. An electromagnetic clutch 20 is attached to the right end of the horizontal shaft 17.
When the motor is energized and the magnetic clutch 21 is turned on, the horizontal shaft 17
is rotated in the sheet material winding direction.

22 is a stretched state 40' on an upper horizontal shaft, which is disposed obliquely above the belt driving row 25' in the upper part of the inside of the exterior of the device, and is rotatably supported by bearings 23 and 24 in parallel with the roller 5;
That is, it is placed in an extended state so as to face the image viewing window hole 2 on the back side of the front panel of the exterior housing of the device.

25 is a toothed pulley integrally fixed to the left end of the upper horizontal shaft 22 and the shaft 26; 26 is a toothed pulley provided on the left end shaft of the belt drive roller 5 via an electromagnetic clutch 27; 28;
is a timing belt suspended around this toothed pulley 26 and the toothed pulley 25 on the upper horizontal shaft 22 side. When the electromagnetic clutch 27 is turned on while the belt drive roller 5 is being driven, the toothed pulley 26 rotates integrally with the roller 5, and the upper horizontal shaft 22 rotates through the timing belt 28 and the toothed boolean IJ 251. The lower horizontal shaft 22 is driven to this shaft 22.
The side roll-wound elongated sheet material 40 is successively rolled up.

Reference numerals 29 and 29 denote sheet material vertical movement guide rail members having a U-shaped cross section and arranged vertically in parallel on the left and right sides of the stretched sheet material 40 between the lower horizontal shaft 17 and the upper horizontal shaft 22.
The left and right sides of 0 enter the grooves of the rail members 29 and 29 on the right side and are guided along the grooves, and the vibration ψ meandering movement of the stretched sheet material 40 in the process of winding up and unwinding the sheet material 400, which will be described later. is prevented.

30 and 31 (Fig. 3) are horizontally long sheet material external contact members attached to the back of the front panel of the exterior case of the device along the lower and upper sides of the image viewing window hole 2, respectively, with adhesive or the like.

It is a flexible and cushioning material such as felt or sponge.

Reference numeral 32 denotes an oblong sheet material rear facing 7 which is disposed on the back side of the sheet material slightly above the lower horizontal axis 17 and facing the sheet outer surface contact member 60 installed along the lower side of the window hole 2. The cleaning rod 32 is a rod that is always urged forward by a spring member (not shown), inserts the sheet material 40 between it and the member 60, and constantly contacts the inner surface of the sheet material 40 with an appropriate force. are doing.

Reference numeral 66 denotes an outer surface of the sheet material installed along the upper side of the window hole 4 slightly below the upper horizontal axis 22, and a horizontally long sheet material back facing facing the contact member 31 and arranged on the back side of the sheet material. Like the lower cleaning rod 32, this cleaning rod 63 is always forced to move forward by a spring member (not shown), and there is a sheet material 4 between it and the member 31.
0, and is constantly in contact with the inner surface of the insert sheet material 40 with a moderate force.

Reference numerals 64 and 35 denote horizontally long sheet material outer-facing cleaning rods that are brought into contact with the partial surfaces of the sheet material 40 wound around the lower horizontal shaft 17 and the upper horizontal shaft 22, respectively, and each of the cleaning rods is A spring member (not shown) is always biased to move in the direction of the rolled sheet material 40, and the roll sheet material always maintains contact with each longitudinal portion of the rolled sheet material regardless of the diameter of the rolled sheet material.

Sl is a sensor such as a microswitch that detects the winding diameter of the sheet material on the lower horizontal shaft 17 side, and S2 is the same sensor that detects the winding diameter of the sheet material on the upper horizontal shaft 22 side.

In the above configuration, the transparent long sheet portion 40 which is stretched between the lower and upper horizontal axes of 17φ22 and is in a tensioned state facing the image viewing hole 2 is shown in the example in FIGS. 1 and 2. A belt 9 plays the same role as the display window glass 4 and is a photoreceptor.
The simple displayed image is visually recognized through the window hole spread sheet portion 40'.

When the inner and outer surfaces of the window hole spread sheet material 40', which is the display window glass, become dirty, press the cleaning start button on the operation panel 6, the motor M rotates, the belt drive roller 5 rotates, and the electromagnetic clutch is activated. 27 is turned on, and the toothed pulley 26 on the roller 5 side rotates together with the roller 5. Then, the rotational force of the pulley 26 is transferred to the timing belt 28.
The rotational force is transmitted to the toothed pulley 25 on the upper horizontal shaft 22 side through which the upper horizontal shaft 22 is rotationally driven, and the sheet material 40 is wound up. By winding up this sheet material 40, a clean sheet material on both the inner and outer surfaces of the roll on the lower horizontal shaft 17 side is paid out and transferred to the window hole 2 portion, whereupon the expansion sheet member 40' is renewed.0 This sheet material 400 Until now, winding was done using window hole 2.
A timer mechanism (not shown in the figure) starts working when the dirty spread sheet material portion 40 facing the window hole 2 is rolled up and the entire area of the window hole 2 is replaced with a clean sheet material on the lower horizontal shaft 17 side, both inside and out. The drive of the motor M is stopped and the electromagnetic clutch 2
7 is turned off, and the winding of the sheet material 400 is stopped.

That is, as a result, the window hole expanded sheet material 40 serving as a display window glass is updated to have clean surfaces on both the inner and outer surfaces without opening the window hole 2, and from now on, the clean mourning sheet material 40 is converted into a clean surface.
The displayed image can be viewed clearly through the screen.

During the winding up of the sheet material shown in L, the dirty sheet material part that is wound around the upper horizontal shaft 22 is cleaned by contact with the cleaning rods 63 and 65 on both the inner and outer surfaces during the winding process, and the upper horizontal shaft 22 has a clean inner and outer surface. The formed sheet material is rolled up.

In this way, whenever the inner and outer surfaces of the stretched sheet material 40' in the window hole 2 become dirty and the image visibility is disturbed, each time the cleaning button on the operation panel 6 is pressed, the sheet material is rolled up to a certain length, and the sheet material is rolled up to a certain length. Two parts of the expanded sheet material 40 are replaced with a clean surface.

Note that the cleaning button may be pressed when the belt drive roller 5 is rotated by the motor M and the belt 9 is rotating due to the display image type hv; in this case, when the button is pressed, the electromagnetic clutch 37 is turned on. The winding of the sheet material 40 is started, and the sheet material 4 is rolled up to Shimamoto.
When the sheet material 0 has been wound up for a predetermined length, only the electromagnetic clutch 37 is turned off by the timer mechanism, and no further sheet material is wound up.

As the sheet material 40 is wound intermittently several times, the winding diameter t (winding diameter) of the sheet material on the lower horizontal shaft 17 side decreases, and that on the -brave side horizontal shaft 22 side increases. When the rolled-up material on the upper horizontal shaft 22 side reaches a certain predetermined sewing position, this is detected by the sensor S2. After this detection signal is output, the cleaning button is pressed to update the window hole expansion sheet material 40.

This time, the motor 20 on the lower horizontal shaft 17 side is turned on, and the electromagnetic clutch 21 is turned on, and the rolled sheet material 40 on the upper horizontal shaft 22 side is rewound to the lower horizontal shaft 17 side, and the cleaning rod 3 filter is turned on. At step 35, the rolled sheet material 40 on the upper horizontal shaft 22 side, which has been cleaned on both the inner and outer surfaces, is fed out to the window hole 2 and transferred, thereby renewing the stretched sheet material portion 40'. In this unwinding of the sheet material, the dirty expanded sheet member 40 that had been facing the window hole 2 is rolled up, and the entire area of the window hole 2 is covered with a rainbow of clean sheets on the inside and outside surfaces on the upper horizontal shaft 22 side. At the point in time, the timer mechanism is activated to stop the drive of the motor 20, and the electromagnetic clutch 21 is turned off, thereby stopping the unwinding of the sheet material 40 above that point μ.

From then on, every time the cleaning button is pressed, the motor 2° and the electromagnetic clutch 21 are turned on to move the sheet material 40 to the lower horizontal shaft 17.
The window hole expanded sheet material is renewed by intermittent unwinding to a certain length.

During the rewinding of the sheet material, the dirty sheet material part that is wound around the lower horizontal shaft 17 is cleaned by contacting the cleaning rods 62 and 34 on both the inner and outer surfaces during the unwinding process. Cleaned sheet material is rolled up on both outer surfaces.

When the sheet material 40 is rewinded several times intermittently and the amount of sheet material rolled in on the lower horizontal shaft 17 side exceeds a predetermined amount, this is detected by the sensor S1, and from then on, each time the cleaning button is pressed, The motor M and the electromagnetic clutch 67 on the H-side horizontal shaft 22 operate to renew the sheet material stretched at the window hole portion by winding up the sheet material as described above. That is, the sheet material 4o is repeatedly used by intermittent winding by the upper horizontal shaft 22 and intermittent unwinding by the lower horizontal shaft 17.

The cleaning rods 32-35 themselves can be configured in various ways. FIG. 5 shows examples of various configurations thereof.

That is, in FIG. 5(a), a hard mandrel 50 such as metal or wood or plastic is removed by a wiping member 5 such as felt, sponge, or cloth.
1 (Figure 1) is a brush rod made by wrapping a hard mandrel 50 with a flocked brush cloth 52 or by directly flocking $50, the same Figure (c). ) is a holding sheath member 56 made of metal, plastic, etc. that is approximately U-shaped in cross section, and two wiping members 5 made of felt, sponge, cloth, etc.
The wiping member 51 shown in FIG.
- 51 is replaced with brush members 52, 52. In the above (a) and et.
The contact rubbing in step 2 removes dirt from the inner and outer surfaces of the sheet material. Also, the dirt on the inner and outer surfaces of the sheet material is scraped off by the mononoke elastic blade members 54 in (c) and (d), and the dirt is removed by the wiping members 51, 51.
Alternatively, it is removed by brush members 52.

In the example shown in FIG. 6, a hard transparent protective plate 4 made of glass, plastic, etc. is disposed in the image viewing window 2 portion of the device.

A flexible and transparent elongated sheet 40 is stretched along the inner surface of the transparent protection board 4 so as to be freely movable. The movement mechanism and operation of the elongated sheet material 40 are similar to those in the example of FIGS. 3 and 4.

The displayed image is made of hard transparent paper → board 4. It is visible through the transparent sheet material section 40 that is stretched along its inner surface. In this case, it is the outer surface of the hard transparent protection plate 4.

Also, the inner surface of the transparent sheet material portion 40, that is, the surface facing the belt 9, which is a photoreceptor, becomes dirty. Inner f of hard transparent protection plate 4
Since the il11 surface is always covered by the transparent sheet material portion 40, dirt is substantially prevented.

That is, the inner surface of the transparent sheet material portion 40 actually becomes the inner surface of the hard transparent preservation plate 4.

Dirt on the outer surface of the hard transparent protection plate 4 can be easily cleaned by wiping it with a clean cloth or the like. If the inner surface, that is, the inner surface of the transparent sheet material 40 becomes dirty, press the cleaning button on the operation panel 3 as in the case of the apparatus shown in FIGS. 6 and 4. The rigid transparent plate 4 is rolled up or unrolled to a certain length onto the lower horizontal shaft 17.
The inner expanded sheet material portion 40 is updated to a clean surface portion. Therefore, the displayed image can be clearly viewed through the transparent sheet material 40 of 1.1J11 of the hard transparent protective plate 4.degree. that is clean and free of dirt.

In the above case, if the transparent sheet material 40 is disposed in contact with the inner surface of the hard transparent protection plate 4, sliding scratches may occur on the surface of the sheet material 40 when the sheet material 40 is rolled up and unwound. For example, by making the sheet material outer surface contact members 31 and 50 disposed along the upper and lower sides of the hard transparent protective plate 4 somewhat thicker than that of the plate 4, the inner surface of the plate 4 and the sheet material portion 40 can be It is preferable that a small gap space exists between the outer surface and the outer surface to maintain the two 4 and 40 in a non-contact state. In this case, the sheet material portion 40 to the gap space
The presence of guide members 29, 29 (FIG. 4) that guide the left and right sides of the sheet material portion 40 prevents dirt and the like from entering from the left and right sides.

The example in FIG. 7 is between the lower horizontal axis 17 and the north horizontal axis 22.

Instead of the long sheet material 40 shown in Figures 6 and 4, a transparent rotary flexible endless belt material 40 made of a polyester sheet or the like is similarly stretched and exposed to the 2 portions of the window hole as a transparent protective plate. be. 62 and 33 are the inner belt portion 4 of the tension belt
The horizontal IJ-ning rods are arranged in constant pressure contact with the belt surface portions near the lower and upper horizontal axes 17 and 22 at 0°, and the pressure contact force of these cleaning rods 32 and 33 allows endless cleaning. The belt material 40 is kept under tension. Further, a slight gap space is provided between the inner belt portion 402 and the outer belt portion 40□ to maintain a non-contact state. When the belt rotates, which will be described later, both belt portions 4
This is to prevent scratches caused by contact movement between 0□ and 40°.

The displayed image is recognized through the outer belt portion 40□Φ inner belt portion 402 of the tension belt. In this case, the surface facing the window hole 2 of the outer belt portion 40□.

The surface of the inner belt portion 402 facing the belt 9, which is a photoreceptor, becomes dirty. Outer and inner belt parts 40□・40□
Intrusion of dirt and the like from the left and right sides of the belt into the gap space is prevented by the presence of guide members 29 (FIG. 4) that guide the left and right sides of the belt.

When the belt surface portion marked E becomes dirty, pressing the cleaning button on the operation panel 3 turns on the motor M-electromagnetic clutch 24 (FIG. 4) and drives the upper horizontal shaft 22 to rotate. This causes the belt 40 to rotate counterclockwise. When the belt 40 has rotated approximately half the length of the belt, the timer mechanism is activated and the motor M-electromagnetic clutch 24. Alternatively, the electromagnetic clutch 24 is turned off and rotation of the belt is stopped. During this belt rotation, the outer belt portion 401, which has been located facing the window hole 2, is cleaned by the cleaning rod 66 and rotates as the inner belt portion 402 to the side facing the belt 9, which is the photoreceptor. Also, while the inner belt portion 402 that has been facing the photoreceptor belt 9 is being cleaned by the cleaning rod 32, the outer belt portion 4 is being cleaned by the cleaning rod 32.
0, facing the window hole 2.

Therefore, the outer belt portion 401 facing the window hole 2. The inner belt portion 40□ facing the surface of the belt 9, which is the photoreceptor, is updated to a clean belt surface, allowing the displayed image to be clearly viewed.Thus, each time the cleaning button is pressed, the belt 40 is driven half a rotation. The belt surface is cleaned and the belt surface is renewed as a transparent impurity storage plate.

The example in FIG. 8 is the same as the example in FIG. is designed to rotate along the outer surface of the hard suppurative plate 4, and the inner belt portion 402 is rotated along the inner surface of the plate 4, and the Velsito rotation mechanism e! Work III is the seventh
The right side of the plate 4, which is similar to the illustrated example, is attached to the exterior casing 1 and held immovably. Further, a small gap space is provided between the outer surface of the hard protection plate 4 and the outer belt portion 40□, and between the inner surface of the same plate 4 and the inner belt portion 40° to prevent mutual sliding. The lower and upper cleaning rods 32 and 33 are the lower and upper horizontal shafts 17 and 22 of the belt 40.
It is brought into pressure contact with each suspension part. The hard protection plate 4 may be placed outside the outer belt portion 40□ and stretched over the window hole 2.

When using endless belt material as shown in Figures 7 and 8.

Since the rotational movement of the belt may be specified in one direction, only one of the upper and lower horizontal shafts 22 and 17 can be used as a driving shaft, and the other can be used as a driven shaft.

Also, on each side of Figures 6 and 4 and Figures 6 to 8, the upper horizontal axis 22
Although the rotation of the drive roller 5 of the belt 9, which is a photoreceptor, is used for driving, the rotation may be driven by a dedicated drive source. Also, the long belt material or the endless belt material 40 is intermittently wound up and unwinded.

Alternatively, instead of rotating, it may be configured to continuously wind up and unwind at a low speed during use of the device, or to rotate and move. A manual rotation knob or handle is provided exposed from the exterior casing of the device, and by rotating l1II22 or d17, the long sheet material or endless belt material 40 can be manually wound up.
It may be moved in a rewinding manner or in a rotational manner.

As described above, according to the present invention, the above-mentioned problems and inconveniences caused by dirt on the surface of the transparent protective plate as the display window glass of this type of image display device are rationally solved, and the intended purpose is well achieved. be done.

[Brief explanation of drawings]

FIG. 1 is an external view of an example of an image display device, and FIG. 2 is a vertical side view thereof. FIG. 6 is a vertical side view of the strip of the first embodiment of the present invention. FIG. 4 is the same side view. Slope view of part, Figure 5(a)
FIGS. 6, 7, and 8 are longitudinal cross-sections of the main parts of the sixth to fourth embodiments of the present invention, respectively. Side view. 1 is an exterior end of the device, 2 is an image viewing window, 6 is an operation panel, 4 is an image display window glass, and 40 is a transparent and flexible long sheet material or endless belt phase.

Claims (1)

[Claims] (1) An image forming/displaying mechanism is built into the exterior of the device in which a display image viewing window hole is formed, with the image display member surface of the mechanism facing the viewing window hole of the exterior tube, and the viewing window hole is provided with a transparent In an image display device with a protective plate, a flexible and transparent long sheet material or endless belt material is used as the transparent protective plate, and the long sheet material or endless belt material is used to cover the image of the device exterior cylinder. The transparent protective plate is stretched so that it can move freely along the opening surface of the window hole, or the long sheet material or endless belt material described above is stretched so that it can move freely along at least the inner surface of the transparent protection plate. . An image display device that takes this as a percentage sign.