JPS6072477A - Picture display device - Google Patents

Abstract

PURPOSE:To make the end of a display picture coincident always with end of a screen even if the size of the screen and display picture is different by providing a control means controlling that the end of the display picture is made coincident with the end of a screen. CONSTITUTION:When a signal HP representing the tip of the screen is detected, a laser light detection signal BD in a main scanning direction M is counted and when the count value reaches Np, the write position of the picture is specified. When the picture clock synchronizing with the picture data is counted and the count value reaches Ns, the write start position of the display picture is specified and an external device (not shown) is commanded so as to output the picture data for one main scanning'share in response to the timing. The end of the picture is made coincident with the end of the display plane B by repeating the operation above until the transmission of required picture data is finished.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an image display device that forms an image on an image carrier such as a photoreceptor belt or an insulating drum, and in particular: Office automation, such as a terminal device or league device, or a copying machine, that reproduces and displays image information output as an electrical signal or stored on a magnetic tape, etc. as a software copy, as a visible image. device 6,
This is an improved image display device suitable for use as an image monitor device in other image-related equipment.

``Regular Technology'' Coffin: CRTI has traditionally been used as an image display device that visualizes and displays image information converted into Qi signals.
(Cathode ray tube) display devices and liquid crystal display devices have been put into practical use.

Of these, CRT display devices are the most commonly used and highly reliable devices, but they are used to display fine-sized characters such as those used in newspapers and magazines, especially those with a large number of strokes such as kanji. It is impossible to display fine letters in their original size due to resolution limitations. There you can decipher it. However, there is a problem in that 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 decreases. Also,
Displaying the same image continuously for a long time will cause screen burn-in and reduce display performance. Furthermore, if the screen flickers, your eyes will get tired. Next, liquid crystal display devices are display devices that have recently been put into practical use, but like CRT display devices, not only do they have insufficient resolution, but they also have the problem of being difficult to manufacture with large screens and being expensive. There is.

Therefore, as a third image display device that does not have the above-mentioned drawbacks, the present applicant has previously proposed the methods shown in FIGS. 1 and 2 using electrophotography.
We proposed an image display device as shown in the figure.

Here, 1 is an M-type device exterior housing, 2 is a display image viewing window hole formed in a large opening on the front panel surface of the exterior housing l, and 3 is a lower part of the front panel protruding forward. and the operation panel arranged on the top surface, 4 is the oil total 24: 'Jm j f='
kpt<'! ! , 7.5, 8.7, and 8 are installed in the upper and lower parts of the case, respectively, so that the axes are parallel to each other and can be freely rotated individually. Four endless belt-shaped photoreceptor suspension support rollers arranged with bearings,'? This is an endless belt-shaped photoreceptor that is suspended and supported by Q4 wooden rollers 5 to 8.

The endless belt-shaped photoreceptor 9 (hereinafter simply referred to as "belt") has a base layer that is, for example, a transparent sheet such as a polyester sheet, and transparency is achieved by depositing a very thin layer of metal on the outer surface of the sheet. By imparting electrical conductivity while maintaining military properties, a layer of photosensitive material such as CdS (
It is entirely readable and is formed with a light-guiding "tight layer", and is suspended and supported by two four-wooden rollers with the photosensitive material layer facing outward.

Among the four rollers 5 to 8, roller 5 is used as a driving roller and transmits the rotational force of a motor M1 (not shown). At least one of the other three rollers 6 to 8, for example roller 6, acts as a belt tension roller and applies tension to the suspended belt 9. Therefore, when the drive roller 5 is driven to rotate counterclockwise in FIG. 2 by the motor M, the hanging belt 9 rotates counterclockwise without slack or slip. Along with this rotation, rollers 5 and 8
During this period, the tension side outer surface of the belt 9 moves past the display image viewing hole 2 from the bottom to the top.

Reference numeral 10 denotes a laser beam scanning type image exposure device fixedly arranged in the inner space of the hanging belt 9, which includes a semiconductor laser/laser angle sensor 11, a polygon mirror scanner 12. ,fl? It has a lens (imaging lens) 13, a reflecting mirror 14, and a transparent plate 15. The transparent plate 15 is a horizontally long transparent flat plate made of glass or plastic, which is placed in pressure contact with the inner surface of the stretched belt portion between the above-mentioned belt failure supply rollers 7 and 8 with an appropriate force.

In this image exposure apparatus 10, an intermittent laser beam L corresponding to time-series electric pixel signals supplied from a total of 391 electronic devices, an image reading device, etc. is transmitted from a semiconductor laser oscillator 11 at the front of the figure to a rotating polygon at the rear of the figure. ” mirror scanner 1
It is oscillated towards 2. The laser beam L incident on the scanner 12 is swung in the width direction and is swung into the f/θ lens 13.
, anti-Q4 mirror 14, and rollers 7 and 8 in the path of transparent plate 15.
The laser beam enters the inner surface of the belt 9 in between and is scanned in the belt width direction. Thereby, this laser beam scanning is used as a main scanning, and the rotational movement of the belt 9 is used as a sub-scanning, and image exposure is performed by the laser beam from the inner surface of the heald.

Reference numeral 16 denotes a toner developing device disposed on the outer surface side of the belt portion between rollers 7 and 8. Note that the transparent plate 15 is
The common tangent mari on the lower side of plate 15 and 8 are arranged with their lower surfaces slightly protruding downward and are in suppressed contact with the inner surface of belt 9, and the single surface 15□ on the belt entry side and exit side of plate 15
and 152 are chamfered so that the heald 9 can be smoothly contacted and moved. In addition, this transparent plate 15 prevents the vertical vibration of the belt 9 caused by contact between the rotationally moving belt 9 and the magnetic developing brush 35 of the developing device 1B, and keeps the exposure position I constant. to improve resolution.

First, after setting the required conditions such as calling the image information and specifying the image display position 1h by operating the buttons on the operation panel 3, when the display start command is pressed manually, the belt 9, which is the photoreceptor, starts moving at a predetermined speed. Rotation begins. Laser beam scanning exposure of designated image information is then started on the inner surface of belt 9 between rollers 7 and 8. At the same time as this exposure, the toner in the developing device 18 acts on the outer surface of the belt, so toner images corresponding to the exposed images are sequentially formed on the outer surface of the belt 9. When the toner image formed on the outer surface of the belt rotates from the bottom to the display image viewing window 2 part as the belt rotates and moves to the specified window hole range position 16, -
The rotation of the base belt 9 is stopped. As a result, an image is displayed in the window hole 2, and the image is visually recognized through the display window glass 4. Next, when the belt 9 is rotated again by the belt re-rotation command, the next display image moves to the window hole range position and the next screen is displayed. After the image is 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 the developing brush 35, and immediately after this cleaning, it is newly exposed to the ν■ light. A new toner image is formed by undergoing simultaneous development.

In this way, image information is reproduced and displayed as a toner image,
In addition, since the image exposure is performed using a very narrow laser beam, it is possible to display high-resolution images that can clearly display small characters and other images, and it also uses a toner application method at the same time as exposure. Because of this, it has an extremely simple configuration that does not require corona charging means or special leaning means, and can be manufactured at a relatively low cost even with large screens.It is possible to construct a highly reliable display device with less failure and photoreceptor deterioration! do.

One problem with such an image display device is when the display surface and the displayed image are different in size. For example, if the display screen is vertical A3 size, it is now vertical A4 size.
Assume that a size display image is input. When a vertical A4 size image is displayed using a vertical A3 size image display means, the vertical A4 size image will be displayed at the upper left position on the display screen.

In this way, when the display surface and the display image are different in size, the display position is shifted, which has the disadvantage that it becomes extremely difficult for an operator to view the image.

[Purpose] The purpose of the present invention is as follows. In view of the above-mentioned points, it is an object of the present invention to provide an image display device in which the end of the display image always coincides with the end of the display screen even when the sizes of the display surface and the display image differ. .

In order to achieve such an object, the present invention provides a control means for controlling an image display device that forms an image on an image carrier and displays the image so that the end of the displayed image coincides with the end of the image display surface. Equipped with.

[Example] Hereinafter, the present invention will be explained in detail with reference to the drawings.

＼ FIG. 3 shows an embodiment of an image display device to which the present invention is applied. Here, 50 is a plate stay that connects the endless belt-like photoreceptor 9 and two chains 39, and several plate stays are installed at, for example, the joint portion 51 of the belt-like photoreceptor 9. Through this plate stay 50, the rotation of the drive roller 5 is transmitted to the photoconductor 9 from a chain 38 that meshes with sprockets 52 attached to both ends of the roller 5, and the belt-like photoconductor 9 is reliably rotated by the rotation of the drive roller 5. Ensure proper rotation. Also, Subroket! - The position of the tooth 52, the position of the belt-shaped photoreceptor 9, and the page display position on the belt-shaped photoreceptor 9 are always maintained in a constant correspondence relationship.

53 is an extension shaft extending from the rotating shaft of the drive roller 5; 54 is a circular light-shielding plate with holes or teeth fixed to the end of the extension shaft 53; 55 is a circular light-shielding plate with holes or teeth attached to the circular light-shielding plate 54; The light shielding plate 54 and the photointerrupter 55 constitute a photoencoder 5θ which is used as a signal generation detection means (belt clock sensor) for obtaining the operation timing for each page. Also, a series of gear trains 57 driven by an extension shaft 53
60, a circular light shielding plate θl is fixed to the shaft end of the output gear 60, and a means for detecting the home position of each page (home A photo encoder B3 is configured to be used as a position sensor.

FIG. 4 shows a control circuit of the image display device shown in FIG. Here, near 0 is a sequence controller,
Based on input signals from various designating operations fli 3, such as specifying the start of a display operation and specifying the number of pages to be displayed, an operation specified by the operator is recognized, and the predetermined operation is controlled and managed. 71 is a roller drive motor (Hl, ) that drives the endless belt-like photoreceptor (belt) 9. 2 driver (drive circuit), 73 developing sleeve (developing brush):
Developing device that drives 35% - Tough 4 (7) Do”p I/
<754fl+200V ~ +3QOV+7) This is a developing bias circuit that outputs a developing bias voltage to the developing device '16, and these drivers 71 and 73 and the developing bias circuit 75 are both connected to the sequence controller I/roller 7.
The operation is turned on and off by the control signal of 0 (continued)
is controlled.

Output signal BCLK of the belt clock sensor (four encoders) 5[1 attached directly to the shaft 53 of the drive roller dyer
The output signal HP of the home position sensor (photo encoder) 63 attached from the shaft 53 of the driving Ronilla 5 via the gear train 57 to 60 is outputted from the 4th axis of the belt-shaped photoreceptor 9, respectively.
Q PH detection signal is supplied to the sequence controller 70, and the sequence controller 70 detects each drive unit 71 based on reception of these signals B (LK and) IP.
．． The drive timings of 73 and 75 are determined and appropriate sequence control is performed. The output signal IP at that time indicates the reference position of the display page portion of the belt-shaped photoreceptor 9, for example, the tip position. Therefore, for example, the light shielding plate 6/l of the sensor 63 rotates once for each rotation of the belt-shaped photoreceptor 9, and the photoreceptor 9 rotates once.
When it is possible to write two pages at a time: At 1°, two shading plates 4+881a of the light shielding plate θl are provided at equal intervals (see Fig. 3).1. , □ This causes the signal HPA □; to be output every time the light shielding plate 61 rotates once. □, 1 7B is a scanner dryer that moves the scanner 12 that scans the laser beam from laser oscillation -111 in the main scanning direction to jl, l, and also moves the scanner 12 a certain number of times 1;/mi. 4T No. S CN indicating whether or not
RD Y I will give candy to the sequence controller 7o.

77 is a laser driver that drives the laser beam oscillator 11, and also indicates whether or not there is an abnormality in the laser beam oscillator 11, such as an abnormality in the one-ship control (G'r!7 La5er RDY
The signal is supplied to the sequence controller 70.

78 is an unblanking signal generation circuit that generates an unblanking signal used to emit a laser beam in a non-image area in the main scanning direction; 79 is an unblanking signal generation circuit that detects the laser beam and generates a laser beam detection signal for unblanking the bow BD. circuit 78
The unblanking signal generating circuit 78 outputs data to the external memory such as an image reading device or an external storage device according to the detection signal BD of the beam detector 79. ) 1 (synchronization signal H used to align video signals in the main scanning direction transmitted from a device (not shown)
Generates sync. Therefore, the two unblanking signals No. 9 and the video signal are passed through the OR gate 80 and are combined with the driver 77. 79 detection (based on if number BD, detection operations such as detection of synchronization deviation of scanning in the main scanning direction are also performed, and the detection signal BDRD"l is sent to the sequence controller 70.
1.

Furthermore, the sequence controller 70 is also supplied with an interface signal for communication connection with an external device, and can exchange commands or data with the external device.

Further, 90 is an Ns counter, and its function will be explained with reference to FIG. 5, which will be described next.

FIG. 5 shows only the display section in this embodiment, and B indicates the display surface of the belt-shaped photoreceptor, and A indicates the displayed image. Also, LL +L2 + sentence! +f)-2 indicates the respective dimensions.In this figure, the laser beam is scanned from left to right (hereinafter referred to as main scanning and indicated by arrow M), and the belt-shaped photoreceptor is scanned from below. Drive upwards (
Therefore, an image is formed from the L side to the first side (hereinafter referred to as sub-scanning and indicated by an arrow S), thereby forming a display image. In order to ensure that the end of image A always matches the end of display screen B,
It is necessary to appropriately determine the image writing timing in each of the main scanning direction and the sub-scanning direction.

The image writing timing in the sub-scanning direction S is as follows.

The table shown in Fig. 5; the length of the l'X plane and the displayed image is ゛,
Ll and sentence 1, respectively. Therefore, the image may be written and started from 11-1 at a distance of (L2-or 2) from the tip of the display surface. Therefore, in this embodiment, in order to calculate the distance N (L2, Q2), the number of scans in the main scanning direction is counted.
Assuming that main scanning of Pm tree is performed per mm, 111p= (L2 12 ) XPm (fraction is 9)
(discarded) is the number of main scans from the tip of the display surface to the image writing start position. Specifically, after detecting the signal IP (signal indicating the tip of the display surface) (see FIG. 4), the laser light detection signal BD in the main scanning direction M is counted, and the counted value becomes Np II! Specify the image writing position at point i.

The image writing timing in the main scanning direction M is determined as follows.

Regarding the image writing position 11q in the main scanning direction M, the determination operation is started from the time when the writing position 11q in the sub-scanning direction is reached. In order to obtain the image writing timing in the scanning direction M, in this embodiment, an image clock synchronized with the image data (see Fig. 4) is used.
are being counted. The image clock is counted in synchronization with the BD double signal indicating the start of main scanning.

The count value is as follows: N5== (L+ fL4 ) ' (Fractional t±
rounded down). Therefore, at the time when the count value becomes <Ns, it is possible to specify the H rainbow i position where the display image is written. Then, according to this timing, an external device (
(without disclosure) & two instructions. By repeating this operation until the transmission of the required image data is completed, the end of the image can be made to coincide with the end of the display surface B. Therefore, in order to calculate the b4 elongation time in the suspension scanning direction S as shown in FIG. In response to the signal, the NS counter (counter for obtaining the delay time in the main scanning direction M) starts counting.Here, the count number - I N S
11 is set by the expressive data. So!
When the predetermined count is completed, one main scan worth of images is completed.

The signal Hsync' requesting image data is sent to external device T:
Buni::"u',.,.,8..5..4°,3 The sequence base and control operation of the controller 70 will be explained.:.

, First, the power supply stage: After the driver, hit the step St and turn each drive unit 72, 74 and 1. and setting to the initial state of 16 ・
(Abandonment), initialize the abnormality diagnosis tube of each part:

After that, in the module S2, the key input from the operation a3 and the interface signal with the external device are monitored. I understand.

, if it is determined that there is a display start '1 command,
Proceeding to the next step S3, the roller drive motor 72 is driven to start the rotation of the endless belt-shaped photoreceptor 9, and the developer motor 74 is driven to apply a developing bias voltage to the developer 16, and the belt is rotated. It is possible to write images on the photoreceptor 9! Make it a tiger.

Subsequently, in step S4, the home position sensor 63 is activated in response to the rotational position of the belt-like photoreceptor 9.
The generation of the home position signal HP from the belt clock sensor 58 is monitored, and when the signal HP is detected, the process proceeds to the next step S5, and counting of the belt clock signal BCLK supplied from the belt clock sensor 58 is started.

Here, the signal Hρ indicates the base position of the display page section.
Image writing is started at the position where the count number of LK reaches a predetermined value n1.
+Of=h, 1*c7)2W2': At 1, it is determined whether or not the count a of the signal BCLK has been reached, and if the number of cycles has reached nl, step S7 is performed. Then, in step S8, the count value of Ns is set to 1.
to・1 Determine whether or not 1. When the count reaches Np, a start command for Ns of run 1 is sent in the main block S10.・ After that,: Send the S1TIT command signal to the external device. Accordingly, in step S12, a video signal synchronized with the synchronization signal Hδ/negative c is transmitted from an external device, and according to the video signal l, the loser driver 77 and the laser oscillation are performed. : Controls the drive 1 and starts writing the image to the belt state empty body 9. 1? Signal BC also during writing.
The total number of LK continues to be 1, and in 1 step S13, the number 1 of the signal BCLK is determined to be 1, and the predetermined value is 1. be constant.

If the runt number of BCLj reaches n2, it is determined that the writing process to the page section has been completed, and the process proceeds to the next step S14, where the roller drive motor 72 is stopped and the developer motor 74 is stopped. and the output of the developing bias voltage are executed, and then, in step S15, a write completion signal indicating that writing of the designated page portion has been completed is sent to the external device.

In this state, the image written on the belt-shaped photoreceptor 9 is displayed on the display window 2, and after the display is finished, the process returns to step S2.
The above process is repeated in response to the display start command.

[Effect] As explained by my son, according to the present invention, the end of the display surface and the end of the displayed image can always be aligned, so the operator who observes the displayed image has the effect of making it very easy to see. It will be done.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing an example of a conventionally known device; FIG. 3 is a sectional block diagram showing an embodiment of the present invention; and FIG. 4 is a control circuit IX of the present embodiment; FIG. 5 is a diagram showing the display unit of this embodiment, and FIG. 6 is a flowchart showing the control procedure of this embodiment. DESCRIPTION OF SYMBOLS 1... Equipment exterior sieve, 2... Display image viewing hole (display window), 3... Operation panel, 4... Display window glass, 5... Drive roller, 6... Belt tension Roller, 7.8... Endless belt-shaped photoreceptor hanging instruction roller, 9... Endless belt-shaped photoreceptor (belt), 10... Laser beam scanning method % type % 11... Semiconductor laser oscillator, 12...polygon mirror, ys, 13...f
0 lens (imaging lens), 14...Reflector, 15...Transparent plate, 16...Toner developer. Patent applicant Canon Co., Ltd. agent Masu Yoshi Tani −′

Claims (1)

[Scope of Claims] l) An image scaling device that forms an image on an image carrier and displays the image, comprising a control means for controlling the end of the displayed image to match the end of the image display surface. An image display device characterized by: 2) The control means includes a calculation means for determining an image display area based on the size of the display image and the size on the image display surface, and a calculation means for determining the image display area based on the result obtained by the calculation means. A patent claim characterized by comprising: means for obtaining a delay time up to 1t from the tip of the image display surface to the point where the image is written; and means for obtaining a delay time from the side edge of the image display surface to the start position of writing the image. The image display device according to item 1. (Hereafter, margin)