JPS5915963A - Image display device - Google Patents

Abstract

PURPOSE:To constitute so that a belt part which becomes an image area becomes a constant part as much as possible, by constituting so that turning length of one turning of a belt-like photoreceptor becomes that which adds belt advancing length required formation and displaying an image (n) times, and length of a small section where a belt joint is positioned. CONSTITUTION:The sum l of an advancing distance la to an exposure spot A after an endless belt-like photoreceptor 8 which is driven intermittently starts its turning, and an advancing distance lb to a distant end 3a of a window hole 3 from the exposure position A is a distance by which the photoreceptor 8 advances by a cycle for forming and displaying one image, and against it, the overall length L of the photoreceptor 8 is constituted so that it becomes that which adds belt advancing length nl required for forming and displaying a picture (n) times, and length DELTAl of a small section where a belt joint is positioned. That is to say, this small section DELTAl is made an idle running part, the constitution is made so that each turning of the photoreceptor is always started from the base point A, by which it is prevented that the belt joints intrudes into a picture area.

Description

[Detailed description of the invention] The present invention relates to a one-picture display device, and more particularly.

This invention relates to a device that forms and displays an image on an endless round-shaped image carrier that can be used repeatedly by rotating it.

Generally Il! 1IyJ display device is CRT (cathode
) type image display apparatuses are widely used, but as an alternative to such type image display apparatuses, the present applicant has developed and proposed an 1ill image display apparatus using an endless belt-shaped image carrier. There is.

In short, this is the money that is drawn up as follows. That is, in Figure EA1, an endless belt-shaped photoreceptor as an image carrier is guided by guide rolls 9, 10, 11, and 12 in an integrated body 1 with a constant H1, and is intermittently driven by a driving means (not shown). 8 (hereinafter referred to as a belt-shaped photoreceptor), the output light of a semiconductor laser (not shown) modulated by an N image signal is caused to travel in one direction through the scanner 5, and further f-Q The back surface of the ntl belt-like sensitive element 8 is exposed through a lens 6 and a mirror 7. This one-ply body 8 is, for example, a transparent conductive body with a photoconductive layer provided thereon.

A sleeve 1 that faces the surface next to the exposure position A of the belt-shaped photoreceptor 8 and has a rotary stone 16 that rotates in the direction of the arrow in the figure.
A developing device 15 with 7 and 9 is provided. The developer 18, which is supplied to the sleeve surface and is uniformly regulated by grade 19, comes into contact with the photoreceptor surface. A DC voltage source (not shown) is applied between the sleeve of the developer and the base of the photoreceptor.
l: Low V in the vicinity of the exposure and development position; >1
3.14 is provided, which allows the belt-shaped photoreceptor 18
The distance between the surface of the photoreceptor and the sleeve of the developing device is kept constant with high precision. The toner image written and formed on the front surface of the Sibelt-shaped photoreceptor by beam light irradiation at position A facing the developing device 15 is sent to the display section 2. This display section 2 is formed so that a rectangular window hole 3 is provided on the front surface of the unit 1, and a transparent member 4 covering the Enge hole 3 is missed so that the toner image on the photoreceptor can be viewed directly from the outside. . Thus, the photoreceptor 8 can be stopped for an arbitrary period of time visually or by operating a switch when the visible image area in the j direction coincides with the position of the window hole 3. The toner image on the surface of the photoreceptor can be visually observed through the window hole 3 through the transparent member 4.

Note that the run f20 is for erasing the history of the photoreceptor, and is turned on only while the belt-shaped photoreceptor is moving, and is turned off when the belt-shaped photoreceptor is stopped.

When changing the displayed content, the photoreceptor 8 can be moved again and the photoreceptor having the toner image on its surface can be used again as it is, so there is no particular need for a cleaner to erase the toner image.

Other methods of displaying a predetermined formed image while rotating an endless belt-shaped image carrier intermittently include:
Ag2HgI. For example, a heat-sensitive recording system may be used in which a reversible heat-sensitive recording material such as the above is formed as the belt, and a dowel is used as the image forming means for the heat-sensitive recording.

Now, in the image display device configured as described above, the belt-shaped image carrier is used repeatedly by its rotation, and the image area and non-image area are different from each other, for example, in the former, no image is written. However, due to the fact that the display unit receives light from the outside, it will show a different history over time than the latter.

In this case, if there are parts with different histories within the image area during a certain image formation/display cycle, this will lead to differences in image shading, so it is desirable that the parts used as image areas be as constant as possible. You can also say.

Therefore, in the present invention, based on such knowledge,
This was done with the aim of making the portion of the entire belt length that becomes the image area as constant as possible.

Moreover, the present invention further aims at the following.

That is, let us now take the entire length of the belt of the image carrier, and - l
l! Ii If the rotational length of the belt that progresses in the image forming/display operation cycle is t, then t71. as long as the amount of t is always accurate. By dividing υ by an integer, the first
However, in reality, it is difficult to adopt the configuration described in IJ due to the positional deviation caused by rotation, the accumulation of stock, etc., and there are many operational difficulties. Furthermore, an endless belt is generally constructed with a seam in a portion thereof, and it is undesirable for the seam to enter the image area in order to obtain a proper image.

Therefore, in the present invention, the L/'L is set to be a fraction of a non-integer (in other words, L = nL + Δti, where n is an integer), and the belt moves once from a certain base point to the next one. The deviation Δt caused by the aforementioned 44□ that occurs when reaching the vicinity of the base point is absorbed and corrected by running idle at the initial stage of the next rotation. A series of operations are also performed from the base point. The belt seam also passes through the image writing position during idle running, thereby reliably preventing the above-mentioned problems from occurring.

The gist of the present invention is to provide an endless belt-shaped image carrier that is driven intermittently, a means for forming an erasable image on the image carrier, and a method for visually observing the formed image on the image carrier. In the image display device equipped with a display section for the purpose of the present invention, the length of rotation when the belt-shaped image carrier rotates once from a predetermined base point is as follows.

The belt is set to be the sum of the length of the belt M line required for n times of image formation and display and the length Δt of the small section where the belt joint is located, and this small section is set as an idle running section.
The image display device is characterized in that each rotation of the image carrier always starts from the base point.

Embodiments of the present invention will be described in more detail below based on the above-mentioned drawings.

In the image display device shown in the drawings, the distance traveled by the photoreceptor 8 from the start of rotation to the start of writing by the exposure is defined as an approach distance ta, and the distance from the exposure position A to the window hole 3 is defined as an approach distance ta. The distance that the photoreceptor 8 travels to the far end 3a is tb.
(distance between A and B in the figure), then these distances La+
The sum of tb (4a+tb) is the distance that the photoreceptor 8 travels in a negative image forming/display cycle.As mentioned above, this t is a non-integer fraction of the total length of the belt of the photoreceptor 8.
It is set so that

The negative cycle of image formation/display starts when a display command is input by operating the blow key 22 of the operation unit 21.
A drive source such as a motor (not shown) starts rotating, and 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 is rotated. 8 starts rotating in the direction of the arrow. Then, at the same time that the rotational speed of the photoreceptor 8 rises to a predetermined speed, the exposure writing operation using the laser beam at the exposure position A is started. The distance M that the photoreceptor 8 travels before the exposure writing operation is the approach distance ta.

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 tc) is completed, the exposure by the laser beam is stopped, but at this point, the photoreceptor 8 is It continues to rotate. Note that a toner image is formed on the surface of the photoreceptor 8 simultaneously with the exposure writing. Due to the rotation of the photoreceptor 8,
When the image area where the toner image is formed reaches below the window hole 3, this is detected by an appropriate detection means and the photoreceptor 8
to stop. In this state, the photoreceptor 8 is passed through the window hole 3.
The visible image above can be displayed. When changing the displayed content, the above operation is repeated.

By the way, as mentioned above, the value of L/'L is set to a fraction of a non-integer (in this example, L=n-4+ΔL: n is an integer), and n image forming/display cycles are required. ga repeat υ
By being turned back, the siberto will perform an approximately -rotation.

To explain this operation process now, in Fig. 2, the diagram (
A) shows the initial state, and shows the state in which the first image forming/display cycle is to be performed. Figure (b) shows the nth position assuming that there is no cumulative positional error.
- The first cycle is completed and the waiting state is shown for the subsequent nth cycle. In contrast, figure (c)
indicates a standby state for the next n-th cycle in a state where 7 positional deviation cumulative errors have occurred when the (n-1)th display is completed. Figure (d) shows a state in which the n-th display is performed following the case of Figure (C).

Note that the symbols such as tn shown below the photoconductor 8 in each figure are as follows:
This shows the classification relationship assuming that there is no positional shift as described above, and the arrow in the figure shows the rotational force direction of the photoreceptor 8 under normal conditions.

Here, the cause of the positional deviation 7 as shown in FIG.
In reality, the value of is varied, and the amount of advance of the photoreceptor 8 per cycle varies.
If a configuration is adopted in which the drive is caused by friction with ~14,
When the rotation starts or stops, if the photoreceptor 8
may slip on the rollers 9 to 14,
The positional deviation caused by this is further added to the positional deviation. In this way, as the display process is repeated, the above-mentioned positional deviation errors are accumulated.

Now, even when the error I shown in FIG. By arranging the seam S in the region of Δ related to the non-integer of t and t, and appropriately selecting the size of Δt and the position of S, the positional deviation error 7 caused by belt rotation can be solved by Even if the seam S is shifted to the tn' portion on the photoreceptor 8 at the time of the nth round, the seam S can be prevented from entering the image area tc'.

But this-! ! Well, if you leave it alone, the next bell will come.

By repeating the one-turn movement, it is inevitable that the seam S will enter the image area.

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

That is, from the image forming position A in the direction of belt rotation (upstream), the predicted maximum value Δta of the variation in the run-up distance between the target value t8 of the run-up distance, the image area tc, and the negative cycle of image formation/display. sum (1, +1c + Δta
) A suitable detector 23 is arranged at a position separated by a distance equal to ). Also, in the initial state shown in Fig. 2 <a>, the seam S
An appropriate detector 24 is arranged corresponding to the location where the detector is located. The seam S is detected by these detectors.

That is, when the detector 23 detects the seam S, the photoreceptor 8 is rotated (runs idle) until the detector 24 detects the seam S, and then the next step is started. is in standby state. After the end of the n-th image forming/display cycle, the positional relationship of the photoreceptors returns to the initial state at the (n+1)th cycle, that is, the first cycle of the next operation. The state shown in FIG. 2(d) then becomes the first state shown in (1=).

In this way, the positional deviation error is corrected every time the photoreceptor 8 makes one revolution.

In addition, in the above embodiment, the reason why the distance between the detector 23 and the image forming position A is set as (tB+tc+Δta) is as follows. Image area t. Although it is necessary to avoid the seam S from entering υ into the r7bl-cJ portion (i.e., non-image area), there is no real harm if the seam S enters the r7bl-cJ portion (i.e., non-image area).

Assuming that the above distance is set equal to (t&+l-c), if the run-up distance varies and the target value tlL becomes a dog, the seam S becomes the image area tc.
It goes inside. Therefore, it is sufficient to take into account the maximum value Δt1 of the variation in run-up distance in the negative cycle of image formation and display.

If a margin is allowed beyond the above Δt8, the number of negative cycles of image formation and display will be wasted (although it is possible to perform open-formation and display without running the image). figure). The same holds true when it is set equal to (za+zb). For the above reasons, it is appropriate to set the distance between the detector 23 and the image forming position A to be (1a+18+ΔZa).

Note that the position of the detector 23 is not limited to the above, and it goes without saying that the detector 23 may be placed anywhere as long as sequence control is performed in accordance with the cast position.

As explained above, according to the present invention, the sum t (-t a + tb)
The exposure position A is set at a position that is a non-integer minus of the total length of the photoreceptor 8, and the seam S of the photoreceptor 8 is detected by the detector 23, so that the photoreceptor 8 is By configuring the system to correct positional deviation errors each time the photoreceptor goes around, even if the run-up distance varies or the photoreceptor slips, a display area equivalent to PN screens can be secured for each revolution of the photoreceptor. In addition, it is possible to provide an image display device that does not cause fatal problems such as a seam portion entering the image area and a portion of display information being omitted, and its usefulness is extremely high.

[Brief explanation of drawings]

FIG. 1 is a side view showing a general outline of an image display device to which the present invention is applied, and a diagram for explaining correction of a positional deviation error of a second light body. 1...Housing, 2...Moat display section, 3...
window hole, 3a... far end, 4... transparent member, 5... scanner, 6... f-Q lens, 7... mirror, 8... photoreceptor,
9-12... Guide roll, 13.14.
...Roller, 15...Developer, 16...Magnet,
17... Sleeve, 18... Developer,
19... Zolade, 20... Lamp,
21...Operation unit, 22...Display key,
23.24...Detector. Figure 1 Figure 2 (d) Procedural amendment 1. List of Cases - 1972 Patent Application No. fA-, )) 5' 7 No. 4, Agent Address: 2-6-2 Marunouchi, Chiyoda-ku, Tokyo J Shinop-]' A Heavy Oil (Building 330,゛8. Contents of the amendment Attachment 1) Amendment The following matters in the specification of the application will be amended. 2, 2nd D 14 I-f-Q ratio 6" is corrected to "f-θ ratio 6." 2. On page 3, line 7, the phrase ``photoreceptor 18'' is corrected to ``photoreceptor 8''. 3. On page 3, lines 14-15, it says "can be seen directly from the outside". It should be corrected to "can be seen directly from the outside." 4. On the 15th line of page 14, the phrase "6...f-Q res." is corrected to "6...f.theta res."

Claims (1)

[Claims] An image comprising an endless belt-like image carrier that is driven intermittently, means for forming an erasable image on the image carrier, and a display section for visually viewing the image formed on the image carrier. In the display device, the length of rotation when the belt-shaped image carrier moves once from a predetermined base point is equal to the length of belt travel required for n times of image formation and display, and the length of belt movement required for forming and displaying images n times. The length of the small section is set to be equal to the sum of the length Δt, and this small section is set as a free running section, and each rotation of the image supporting body is always started from the base point. Image display device.