JPS6026975A - Image display device - Google Patents

Abstract

PURPOSE:To form a display image having high image quality by forming the visible image for display by an image forming means in the predetermined region of an endless belt-like image carrier and setting the length of the image carrier used for forming and displaying said one image at an integer fraction of the overall length of said carrier. CONSTITUTION:When a writing operation by exposing is started, a photosensitive body 8 continues to turn at a prescribed speed and the writing operation by exposing is continued as well. The writing by exposing with laser light stops at the same instant when the writing by exposing of the area part corresponding to the area of a window hole 3, i.e., an image area is completed, but the body 8 continues to turn until said body arrives at the display position. When the image region where a toner image is formed comes under the hole 3, said region is detected to stop the body 8. The visible image on the body 8 is displayed through the hole 3 in this stage. The length of the belt moved by such one operation is set at an integer fraction of substantially the overall length of the belt so that the belt makes approximately one turn when the cycle for formation of n-pieces of the images and displaying the same is repeated.

Description

[Detailed Description of the Invention] The image display device liquid for displaying data on computers, facsimiles, etc. will be described in more detail.
By forming and displaying an image on a hearth belt-like image bearing part that can be repeatedly used by the side Z, this method is superior to the one related to the display.

Generally, CI'tT (cathode ray tube) type image display devices are widely used to display data such as computer fax machines, but as an alternative to this type of image display device, Honduke has developed We have developed and proposed an image display device using a belt-like image carrier that can be moved endlessly.

This basically consists of the configuration shown in Figure 1.)
Ru. That is, in the figure, an endless belt-shaped photoreceptor 8 (as an image carrier) is guided by guide rollers 9, 10, 1.1. A belt-shaped photoreceptor (hereinafter referred to as a belt-shaped photoreceptor) is installed, and the light of a semiconductor laser (not shown) modulated by an image electric signal is scanned in one direction by a scanner 5111m, and further transmitted through a VCF/θ lens 6 and a mirror 7. [1] The belt-shaped photosensitive stop 8 is provided so that the back side thereof is exposed. These eight photoreceptors each have, for example, a transparent conductive substrate on which a photoconductive layer is provided.

A sleeve 1 having a magnet 16 facing the surface of the belt-shaped photoreceptor 8 at the exposure position A and rotating in the direction of the quotient arrow.
A width imager 15 having a diameter of 7 is provided, and a conductive and magnetic developer 181 is supplied to the sleeve surface.
- Contacts the surface of the photoreceptor while being controlled uniformly by the blade 19.

A DC voltage source (
(not shown), a direct current of 7 volts is applied, and F
× Is it pandering to FISC as far as light and development? Nike 4-La 13
, 14 are tilted, and the belt-like photoreceptor 8 is kept flat and the distance between the blood and the developer tube 11 is kept constant. It is.
u佼1:: The belt-shaped photoreceptor surface 1cIIIJ included type TI';-
: Sent to Rena toner image ba7J 2nd part 2.

This T-receiving part 2 is formed as a planting where four rectangular holes 3 are provided on the front surface of the housing 1, and the toner image on the photoreceptor can be viewed directly from the outside through a transparent member 4 that covers the alignment holes 3. has been done.

When a predetermined visible image area of the photoreceptor 8 coincides with the position of the window hole 3, it can be stopped automatically or for an arbitrary period of time by operating a switch 1C. and the window hole 3
The toner image on the surface of the photoreceptor can be visually observed through the transparent member 4.

The lamp 20 is for erasing the history of the photoreceptor, and is turned on while the belt-shaped photoreceptor is moving and turned off when it stops.

FIGS. 2 and 3 are H9 photos explaining the principle of image formation on the belt-shaped photoreceptor 8 used in the apparatus shown in FIG. 1 above.

Figure 2 shows the situation in front of the car in the bright area of the information light. When a voltage is applied through the sleeve 17 and the toner 18 comes into contact with the photoreceptor 8vc, an electric field is applied to the light guide V layer 8c. . At this time, when the transfer light is irradiated, seven carriers e in the photoconductive layer 8c are guided to the vicinity of the surface of the photoconductive layer 8c by the action of an electric field. As a result, an electrostatic attraction force acts between the toner 18 and the photoconductive layer 8c, and the toner 18F! 7. The photoconductive layer 8c is attached to the surface of the photoreceptor 8. In the illustrated example, the photoconductive layer 8C is an N-type semiconductor, and a positive voltage is applied to the toner 18. Therefore, carriers e generated in the vicinity of the substrate in the photoconductive layer 8C by the irradiation with the information light LB become photoconductive N8c.
is well guided in the direction of the surface. As a result, a strong electrostatic attraction force acts between the toner 18 and the photoreceptor 8, and the toner 18 adheres to the photoreceptor.

FIG. 3 shows the state of charge in the dark area. When an electric field is applied between the toner 18 and the transparent conductive layer 8b of the base, an electrostatic attraction is exerted between the two, but since there is a photoconductive layer 8c between the two, there is a distance between them. Because it is there, its power is small. Therefore, the magnetic force due to the rotating magnet 16 installed inside the fixed sleeve 17, the toner]8
The toner 18 is drawn away from the photoconductive layer, ie, the surface of the photoreceptor 8, due to the sticking force between the particles.

Note that when changing the toner image on the photoreceptor 8, a new image can be formed simply by passing through the exposure position again. That is, when the toner retaining portion of the photoreceptor changes to a region that does not retain toner, the toner 18 that is not irradiated with light and whose electrostatic adsorption force has decreased due to aging is removed by the magnetic field of the magnet 16 and no longer has toner. It's going to be a no-go area. On the other hand, if the toner retaining section remains, the toner 18 is irradiated with light, the carrier e is injected, the toner 18 is taken out by overcoming the magnetic field, and the toner retaining section continues. Therefore, since the toner image on the surface of the photoreceptor does not have any adverse effect on the next image formation, there is no need to provide a separate cleaning means.

In the above-mentioned Section 2 J and FIG. 3, E indicates a power source for applying heavy pressure to the sleeve of the polyethylene terephthalate film 8a supporting the conductive layer 8b.

Note that while the endless belt-shaped image carrier is intermittently rotated,
Other methods for displaying one predetermined image include:
Examples include a thermal recording method in which a reversible thermal recording material such as Ag2HgI4, which is a compound of silver, mercury, and iodine, is formed as the belt, and a thermal recording head is used as an image forming means.

Now, in the above-mentioned image display pupil, the image carrier such as a belt-shaped photoreceptor on which an image is formed has approximately the same portion repeatedly used for image formation by rotation of the belt. The predetermined length of the belt that moves in one image display cycle includes an image area and a non-image area, and this image area receives image light at part A and a toner image is written on it. In addition, the display section 2 is affected by external light from the perforations 3, and a different history is produced in the non-image area due to the characteristics of the photoreceptor 8.

If we look at this error over time, we can see that there are parts that frequently appear in the image extension area and parts that do not, and if these parts were included in the image formed by -, the history of both would be different. If a fixed portion of the photoreceptor is used for display or image formation in this way, the image carrier is the photoreceptor. In some cases, the photosensitive layer and heat-sensitive layer of these image carriers may be partially affected by deterioration due to the irradiation of light from the display section, information light, or in the case of a heat-sensitive recording medium, the use of heat-retaining means. . By stopping the image carrier in such a state midway without transporting it a predetermined length, and then forming a predetermined length ρ image, the display position of the image carrier relative to the window hole 3 is shifted. If the image is affected by light, etc., the m degree of the formed image may differ between the area affected by the light, etc. and the area that has not been affected by the light, etc. due to the run-up or image-separation area. There was a difference in image quality, and the image quality was sometimes degraded.

It is an object of the present invention to provide a device which solves the eye curvature and the aperture angle that the conventional double-image display device has and forms a display image of high quality. Yet another object is to limit the influence of the image carrier to a defined area of the image carrier, thereby making it possible to prevent changes in image quality within the -1iiiII image. Still another object is to provide an image forming apparatus that maintains the image quality within one image with a simple configuration.

An image display device of the present invention that achieves the above object includes an endless belt-shaped image carrier, a plurality of support members that support the image carrier in a movable manner, and a plurality of supporting members that support the image carrier in a manner that allows the image carrier to move along the support. an image forming means for forming an image on the image bearing member; and a moving means for moving the image bearing member K; A visible image for display is formed by the image forming means in a predetermined area of the image carrier, and this 1
The length of this image carrier used to form and display one image is the total length of the image carrier II'! -a fraction of a fraction
, and the same area is always used for display.

Hereinafter, an actual embodiment of the present invention will be explained by taking an image display device having the configuration shown in FIG. 4 as an example.

In the image display device shown in FIG. 4, the photoreceptor 8 rotates in the direction of arrow C, and the moving speed of the photoreceptor 8 stabilizes until writing by refraction of the laser beam starts. The distance traveled by the body 8 is defined as the run-up distance la, and the distance traveled by the photoreceptor 8 from the exposure position A to the far end 3a of the window hole 3 is defined as l.
b (distance between point A and point B in the figure), these (7)
Elfin La, 1b (7) sum, e (=ea ten lb
) is the distance that the photoreceptor 8 moves during the image forming/display cycle, and in the present invention, the relationship l between the side V7 and the overall length Lb of the belt-like photoreceptor 8 in the moving direction is expressed as l.
/L is set to be 1/integer, and this characteristic groove line will be described below along with the explanation of the actual mounting operation.

When a display command is input by operating the display key 22 of the operation unit 21, a motor, etc. (not shown) is driven.
1# starts rotating. The rotation is transmitted to the rollers 9 to 14 by an appropriate transmission means such as a gear or a chain, and as the rollers rotate counterclockwise, the photoreceptor 8 rotates in the direction of the arrow C in the figure. Start. Then, at the same time, when a suitable known timer detects that a preset time necessary and sufficient for the rotational speed of the photoreceptor 8 to rise to a predetermined speed, that is, a run-up time has elapsed, the exposure position liA is detected. The glazing operation using the laser beam at the point is started. Photoreceptor 8 within the above accounting time
As mentioned above, the distance traveled by the vehicle is equal to the run-up distance #la. The eight photoreceptors continue to rotate at a predetermined speed, and the exposure writing operation is also continued.

Then, a surface portion of the photoreceptor 8 corresponding to the viewing surface area of the window hole 3, that is, an effective display area (length in the moving direction is 7c) [When optical writing is completed, the same MVc laser beam is applied. The light stops. However, at this point, the sensitivity is 8.
moves to the display position - continues to rotate all the way. However, as is clear from the above explanation of the principle, a toner image is formed on the bag surface of the photoreceptor 8 simultaneously with the exposure writing. As the photoreceptor 8 continues to rotate, the tip of the effective display area where the toner image is formed is brought to the far end 3a of the window hole 3.
When this is reached, this is detected by a conventional appropriate detection means, and the exposure t4-8 is stopped based on this detection signal. In this state, a visible image formed on the photoreceptor 8 can be displayed through the window hole 3. When changing the displayed content,
All you have to do is repeat the above operation.And in this example, from the exposure position A to the window hole 3
The distance 1Ii1. to the far end 3a, which is also the end of the display area, in the moving direction of the photoreceptor 8. lb and the run-up distance gla of the photoreceptor 8
Harmony with! Since the exposure position is set at a position where (-la+l!b) is an integer fraction of the total length of the photoconductor 8 in the moving direction, In the case where there is one or more image areas in the image display area 7c, the same part of the photosensitive layer f4-8 is always used repeatedly when displaying the image, and this image area is always Since VCl1l15 will be used under the same conditions (for example, the influence of external light, etc.),
-II! This has the advantage of not causing problems such as partial image shading within the II scanning.

Note that the starting WL of this embodiment is an endless belt-shaped II! having the following configuration. An iI image carrier may also be used. In other words, as mentioned above, the present invention is based on -i[! I
It is also inside the belt that moves during the cycle of flaw formation and display, so both fecal areas are always a constant part, so it is non-fil! ii) It is said that there is no particular need for the image area to be a photoreceptor.

Therefore, the analogy is the effect display area l mentioned above. It is also possible to use a sheet-like photoreceptor having a size that can cover the entire area, and to support the sheet-like photoreceptor by a support member made of an endless belt-like non-photoreceptor.

By the way, if we assume that the total length of the belt of the image carrier is 7 and the rotation length of the belt that progresses during the image forming/display operation cycle of Ll-, then as long as the amount of l is always accurate, it will be 1.
By setting 17L to 1/'Vγ·, the purpose of section 1.1 is almost achieved. However, in reality, positional deviations and accumulations occur between the image bearing member and the guide roller due to rotation, and the position on the image bearing member that receives the bright light at the entry point of the exposure position shifts. . In general, endless belts are
It is normal to have a joint at the II, and it is undesirable that this joint enters into both edge regions due to the cumulative viscosity of the above-mentioned positional deviation.

To solve this problem, let nil+Δl<it
At the same time, the deviation 7 caused by the above 11L that occurs when the belt moves from a certain base point once and then reaches the vicinity of the base point is calculated as follows: By letting the belt run idle at the initial stage of one ra, (1) is absorbed and corrected, and as a result, the series of operations for the next one rotation is also performed from the base point. This made it possible to reliably prevent this.

Hereinafter, embodiments of the above configuration will be described in more detail based on the case of the above-mentioned drawings.

In the image display device shown in the drawings, the distance that the photoreceptor 8 travels from when it starts rotating until it starts writing by exposure is the run-up distance 11! a, and the photoreceptor 8 is moved from the exposure position A to the far end 3a which is the end of the display area of the window hole 3.
Let the distance traveled by lb be (distance m between A and B in the figure), then the sum of these distances mla and lb is 13 C=l13+lb
) is the distance that the photoreceptor 8 travels in one image forming/displaying cycle. This l is set to be substantially an integer fraction of the total length of the belt of the photoreceptor 8 as described above. However, since it actually has a length Δl for absorbing the positional deviation of the photoreceptor, it is not equal to 1/an integer in the strict sense.

In fact, in the case of the above-mentioned endless belt-like photoreceptor of 800 mm, the maximum rotation is about 2 to 5 M.

Similarly to the above, in FIG. 4, one cycle of image formation and display is when a display command is input by operating the display key 22 of the operation unit 21, and a drive source such as a motor (not shown) rotates. The rotation is transmitted to the rollers 9 to 14 by appropriate transmission means such as gears or chains, and as the rollers rotate, the photoreceptor 8 starts rotating in the direction of arrow C. Then, at the same time that the rotational speed of the photoreceptor 80 rises to a predetermined speed, the exposure writing operation using the laser beam at the exposure position point A is started based on the above-mentioned principle.

Thereafter, the photoreceptor 8 continues to rotate at a predetermined speed, and the exposure writing operation continues. Then, at the same time as the exposure writing of the area corresponding to the area of the window hole 3, that is, the image area (the length in the advancing direction is l) is completed, the exposure writing by the laser beam is stopped. 8 continues to rotate until it reaches the display position. And photoreceptor 8
When the image area where the toner image is formed reaches below the window hole 3 due to the rotation of the photoreceptor 8, this is detected by an appropriate detection means and the photoreceptor 8 is stopped. In this state, the window hole 3
A visible image on the photoreceptor 8 can be displayed throughout.

When changing the displayed content, the above operation is repeated.

By the way, as mentioned above, the value of l/L is substantially 1/integer (in this example, L=nJ+Δ: nlt integer)
By repeating n image forming/displaying cycles, the belt rotates approximately - To explain this operation process now, in the fifth section, the belt rotates as shown in figure (a). ) indicates the initial state μ6, which indicates the state in which the image formation and display cycle of the first silkworm H is performed from now on. Figure (b) shows a waiting state for the subsequent n-th cycle after the n-1#th cycle has been completed, assuming that there is no position IC cumulative error. On the other hand, Figure (c) shows a standby state for the next n-th cycle, with a position iW shift cumulative error of 7 occurring when the (n-1)th display is completed. Figure (d) shows a state in which the n-th display is not displayed following the case of Figure (C).

Note that the marks such as /n shown in the upper part 1 of the photoreceptor 8 in each figure indicate the classification relationship assuming that there is no positional deviation as mentioned above. It shows the normal rotational direction of the body 8.

Here, the cause 1 of the positional deviation 1 as shown in FIG.
The value of a actually varies and the progress of the photoreceptor 8 per cycle varies, and furthermore, when the rotation of the photoreceptor 8 is driven by friction with the rollers 9 to 14, When the rotation starts or stops, the photoreceptor 8 may slip with respect to the rollers 9 to 14, and the positional deviation caused by this is further added to the positional deviation. Become. In this way, as the display process is repeated, the above-mentioned positional deviation errors are accumulated.

Now, even when error 1 as shown in FIG. 5(C) above occurs, the accumulated error Z does not become so large within the range of one rotation of the belt. For example, by arranging the seam S of the belt-shaped photoreceptor in the related Δl area mentioned above, and appropriately selecting the size of Δl and the position of S, the positional deviation error caused by rotation of the belt can be reduced by 7 degrees. Since it is small, even if the seam S is shifted to the An' portion on the photoreceptor 8 during the n-th cycle, the seam S can be prevented from entering the image area C'. However, if this is left as is, it is inevitable that the seam S will enter the image area by repeating the next rotation of the belt.

Therefore, in this example, the error that occurs each time the photoreceptor 8 moves once is corrected as follows.

That is, from the exposure position 11iA, which is the image forming position, in the direction of rotation of the belt (upstream), the target value la of the run-up distance, the image area Jc, the image formation, and the predicted variation in the run-up distance in the - cycle of the display. An appropriate detector 23 is disposed at a distance # equal to the sum of the maximum value Δalla (/a+l.+ΔA!a). In addition, a suitable detector 24 is provided corresponding to the location where the seam 8 is located in the initial state shown in FIG. 5(a). The seam S is detected by these detectors.

That is, when the seam S is detected by the detector 23 (c), the photoreceptor 8 is rotated (runs idle) until the seam S is detected by the detector 24, and then the next step is waited. State and make. That is, after the completion of the n-th image forming/displaying cycle, the positional relationship of the photoreceptor returns to the initial state at the (n+1)th cycle, that is, the first cycle of the next operation. That is, the state shown in FIG. 5(C) changes to the first state shown in FIG. 5(a). In this way, the positional deviation error is corrected every time the photoreceptor 8 makes one revolution.

The reason for setting the distance between the detector 23 and the image forming position A as (la+Ac+Δla) in the above embodiment is as follows. Image area l. Although it is necessary to prevent the seam S from entering into the r lb-'loJ portion (that is, the non-image area), there is no real harm. Assuming that the above distance is set equal to (la + dc), if the run-up distance becomes larger than the target value ea, then the eye S will move to the image area 12.
It goes into c. Therefore, the maximum value Δl of the variation in run-up distance in the - cycle of image formation and display
All you have to do is take into account a. If you allow a margin beyond the above Δ, you will waste the number of cycles of image formation and display (even though it is possible to form and display an image without running it idle). regardless of). Also (l, ten l
The same applies to the case where it is set equal to b). For the above reason, the distance between the detector 23 and the image forming position A is C11a+l.
. It is appropriate to set it to 10Δla).

Note that the location of the detector 23 is not limited to the above, but may be located inside or outside. As long as you perform sequence control according to the installation location, you can install it anywhere and it will last a long time.

Next, an example of detecting the seam S of the photoreceptor will be described with reference to FIG. 6.

For example, a side edge 8d of a transparent substrate 8a that connects the photoreceptors 8 at the right end with adhesive or the like and controls a part of the photoreceptors 8.
A mark M'i- is provided at the joint position.

FIG. 6 shows the state of barking, and it will be understood that the mark M is placed corresponding to the seam S of the photoreceptor 8.

This mark M may be applied by an appropriate means such as printing so as to have a light shielding property. 12. Furthermore, in this embodiment, a detector 2 consisting of a light emitting element and a light receiving element is provided in the housing 1, corresponding to the position of the mark M on the belt-shaped photoreceptor 8.
3.24 are fixedly arranged in a pair spaced apart in the moving direction of the belt. When the mark M passes between the light emitting element and the light receiving element pair of the detector, the mark M, that is, the seam S of the photoreceptor 8 is detected as a change in the amount of light received by the light receiving element.

Note that it goes without saying that a reflective sensor may be used in place of the above-mentioned transmissive sensor.

Further, as the mark M, a hole may be provided in the photoreceptor 8 instead of the above-mentioned printing or the like.

By the way, in the apparatus of the above embodiment, the length of the photoreceptor used to form and display one image is determined by the position of the developing device or the total light position, which is the image forming order, and the far end 3a of the hole 3. Although an example in which a run-up distance is added, the present invention is not limited to this. For example, when a run-up is not required when forming a display image, the worry of a run-up disappears due to the above-mentioned length condition. Furthermore, if the position of the image forming means is brought closer to the window hole 3 of the display section t1, the conveyance distance between the image forming means and the display section becomes unstable.

In this manner, various conditions can be considered by selecting the image forming means, its arrangement position, etc.

The most basic thing is that the image area for display, which has a constant area on the image carrier, does not change each time the image carrier rotates. For this purpose, this certain area may be set to 1/1i of the total length of the image carrier.

Note that when the image carrier is formed into a belt shape as in this embodiment,
Due to the structure of the conventional drive mechanism, it is a national problem to move the image carrier at a constant speed from the beginning of the drive. In such cases, the moving speed of the image carrier is detected using a combination with an encoder or a photo interrupter, and the movement ff1lj! 4
Speed of optical scanning II-? If the timing is controlled, the run-up distance described above becomes unnecessary.

However, since detection of the speed of the image carrier and control of the scanning speed are complicated, it is extremely effective to employ run-up of the image carrier for image formation.

In addition to the above-mentioned examples, the image carrier to which the present invention can be applied is effective as long as it can be changed in quality by light or heat, and is not limited to the structure of the above-mentioned example. Furthermore, in terms of image forming time, in addition to laser light, LE is used as a source of information light.
It is also possible to combine a D$7 array or a liquid crystal shutter with a modulator function with a light source. Further, when using a heat-sensitive recording medium, a thermal head is used.

As described above, the image display device according to the present invention can achieve the above-described relationship by providing the above-mentioned relationship between the overall belt length of the image carrier and the belt movement for image formation and display. Excellent benefits can be obtained and its usefulness is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of an image display device, FIGS. 2 and 3 are diagrams explaining the principle of the image forming process of the embodiment apparatus, and FIG. 4 is a sectional view of the main part of the image display device of the present invention. Figures 5(a) to 5(dlVi) are schematic diagrams in which a position correction function is provided as an embodiment of the present invention, and Figure 6 is a perspective view of an image carrier showing an example of position detection. 2-digit display area, 5, 6, 7, and 15 are image forming means, 8-digit belt-like photoreceptor, S indicates heath. Applicant Canon Co., Ltd. JP-A-Sho GO-26975 (9)

Claims (7)

[Claims] (1) In a device for displaying one image, an endless belt-shaped image carrier, a plurality of support members movably supporting the image carrier, and the image carrier is moved along the support member. an image forming means for forming a visible image on the image carrier; and a display section for viewing the visible image formed on the image carrier moving within the housing. However, a visible image for display is formed by the image forming means at a predetermined length on the fIp holding body, and fIj! is used to form and display this one image. A uniform display device in which the length of the carrier is an integral fraction of the entire length of the carrier. (2) Claim No. 1
# Image display device described in ). (3) The length of the image carrier used to form and display one image is the length of the above-described predetermined area and the run-up distance of the image carrier until the image forming means becomes operational. The image display device according to claim 1, which is the sum of the following. (4) The length of the image carrier used to form and display one image is defined as the length of the determined working area and the distance to transport the image carrier from the image forming position to the display section. The image display device according to claim (1), which is a sum of: (5) The length of the image carrier used to form and display the above one image, the length of the above determined area, and the run-up distance of the image carrier until the image processing means becomes operational. and the distance for transporting the image carrier from the image forming position to the display section. (6) In a device for displaying an image, an endless belt-shaped image carrier #I, a plurality of support members that support the image carrier in an endlessly movable manner, and move the #I carrier along the support member. Drive to make w1
means, an image forming means for forming a visible image on the image carrier; a display section for viewing the visible image formed on the image carrier moving within the housing; and the image carrier. a detecting means for detecting a specific position of the supporting body, a visible image for display is formed by the image forming means at a predetermined length on the supporting body, and this one image is formed; The length of this image carrier used to display
An image display device that is substantially one integer fraction of the entire length of the in-phase carrier, detects a predetermined position of the image+1 carrier by the detection means, and corrects the image forming position with respect to the image carrier. (7) The first image carrier has a length that is an integral multiple of the length used to form and display one image, as well as a slight length to correct positional deviations that occur during rotation. A circular image display device according to claim (6).