JPS6072479A - Picture display device - Google Patents

Abstract

PURPOSE:To prevent the malfunction of position detection due to the waving of a picture carrier such as flapping or deflection by using a detection signal generated from a drive means moving the picture carrier as the position information of the picture carrier. CONSTITUTION:The output signal HP of a home position sensor (photoencoder) 63 fitted to a picture display device via gear arrays 57-60 from a shaft 53 of a drive roller is fed to a sequence controller 70 as the absolute position detection signal of a belt from sensor 9 and the count of a belt clock BCLK is started by detecting the output signal HP. Thus, the sequence controller 70 discriminates the drive timing of drive sections 71, 73 and 75 to perform proper sequence control for the picture display. The output signal HP in this case represents a reference position of a display page part of the belt form sensor 9, e.g., the tip position. Thus, when it is possible for the sensor 9 for the write of two pages' share, two signals HP are outputted at each revolution of a light shielding plate 61.

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 particularly relates to an image display device that forms an image on an image bearing member such as a photoreceptor belt or an insulating drum, and in particular, Image information converted into an air signal that is output from calculations or read out, or image information stored on a magnetic tape or the like as a soft copy,
This is an improved image display device suitable for use as a terminal device or league device that reproduces and displays a visually recognizable image, or as an image monitor device in office automation equipment such as a copying machine, or other image-related equipment.

[Prior Art] CRT (cathode ray tube) display devices and liquid crystal display devices have been put into practical use as image display devices that visualize and display image information converted into electrical signals.

Of these, CRT display devices are the most commonly used and highly reliable devices; Displaying characters in their original size is impossible due to resolution and +X. Therefore, the text is enlarged and displayed to make it easier to read, but there is a problem that the number of characters that can be displayed on the screen decreases in inverse proportion to the enlargement, and the amount of information per screen decreases. Furthermore, if the same image is displayed continuously for a long time, the screen will be burned in and the display performance will deteriorate. Additionally, if the screen flickers, your eyes will get tired and wick. Next, liquid crystal display devices are display devices that have recently been put into practical use, but like CRT display devices, they not only have insufficient resolution, but also are difficult to manufacture with large screens and are expensive. The problem is that it becomes

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, l is a vertical device exterior part, 2 is a display image viewing hole formed in a large opening on the front plate surface of the exterior part l, and 3 is a display image viewing window hole formed on the upper surface of the front plate with the lower part of the front plate protruding forward. The operation panel 4 is a display window placed in the window hole 2, 5, 8. 7 and 8 are two trees each at the top and bottom of the exterior @ 1, parallel to the horsetails with the axis in the left and right direction of the exterior. In addition, there are four endless belt-like photoreceptor suspension supporting rollers which are individually rotatably supported on bearings, and reference numeral 9 designates an endless belt-like photoreceptor tank having the four rollers 5 to 8. □.

This endless belt-shaped photoreceptor 9 (hereinafter referred to as a car belt) is made of, for example, a transparent sheet such as a polyester sheet, etc., where the integral layer is a transparent sheet, etc., and then the sheet is evaporated. By restoring the conductivity, a photosensitive material layer (photoconductive 1. layer) such as CdS is formed on the evaporated side of the metal. The frame is entirely flexible and is suspended and supported by the four rollers mentioned above with the optical material layer side facing outside.

Among the four rollers 5 to 8, roller 5 is used as a driving roller to transmit the rotational force of a motor (not shown). At least one of the other three rollers 8 to 8, for example roller 6, acts as a tension roller and is therefore: drive roller 5 above motor M'°. :1. When rotated counterclockwise, -47) Mushroom 9:1L, counterclockwise without sagging or slipping! 11 rotates and moves -0 With this rotation, the tension of the belt 9 is increased by the external force of the belt 11 at 5 and 8 -1 ↑ not shown, straw picture 6゜ "i" 4゛″ Place the viewing hole 2 from the bottom to the top: jQ is the inner empty space of the hanging belt 9.
z -q e-"1"°"5"": * *,,) J
, ! Then, the semiconductor laser oscillator 11, the port 〒'7
'(Image formation adjustment), 13. 1 having a reflecting mirror 14 and a transparent plate 15, 1 transparent plate 1
Reference numeral 5 designates a horizontally long transparent flat plate made of glass or plastic, which is placed in pressure contact with the inner surface of the tensioned belt portion between the above-mentioned belt suspension support rollers 71 and 8 with an appropriate force. .□.

This image exposure device, IO, corresponds to time-series electric pixel signals supplied from an electronic computer, an image reading device, etc.
(7) * m #-v -f @"""1""i
j K 17 (7) Oscillation is directed toward the rotating polygon mirror scanner 124. Scan': S12 → This incident angle: The laser beam L is swung by one loaf in one direction of the belt, and f
・Theta lens 13, reflective mirror 14', transparent: 1 plate 15 path 1, vine between rollers 7 and 8, root? . inner side,
3 incident, □ in the belt width direction, the rape beam scans □ 6 degrees, = g +, : yo 9, = lqv-1fE'' -h!
', *ei scanning, belt 9A rotation: movement is sub-scanning, and image exposure is performed with a laser beam from the inner surface of the belt.

Reference numeral 18 denotes a toner developer disposed on the outer surface of the belt portion between rollers 7 and 8. Note that the transparent plate 15 is
The lower surfaces of the plates 15 and 8 are arranged with their lower surfaces slightly protruding downward from the common tangent line on the lower side of the plates 8, and are in suppressed contact with the inner surface of the belt 9. ,
and 152 are chamfered and rounded so that the belt 9 can contact and move smoothly.

In addition, this transparent plate 15 prevents vertical vibration of the belt 9 caused by the vertical movement of the rotating belt 9 and contact with the magnetic developing brush 35 of the developing device 18, and keeps the exposure position constant. to improve resolution.

First, after setting the required conditions such as calling up the image information and specifying the image display position by operating the button in operation a3, the display start command is manually pressed and the photoconductor Peru 9 is placed at a constant speed. rotation begins. Next, the laser beam scanning exposure of the specified image information is carried out between rollers 7 and 8.
It starts on the inner side of 9. At the same time as this exposure, the developer 16
Since the toner acts on the outer surface of the belt 9, 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 below to the display image viewing window 2 part as the belt rotates and moves to the specified window position, the belt 9 is rotated. movement is stopped. As a result, an image is displayed in the window hole 2, and the image can be viewed through the display window glass 4. Next, when the belt 9 is rotated again by the belt re-rotation operation command, the next display image moves to the window hole range position,
The next screen will be 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 and simultaneously developed. By receiving the toner image, a new toner image is formed.

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 a high-resolution image that can clearly display fine letters and other uniformity, and it is also possible to use 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 a highly reliable display device with less failure and photoreceptor deterioration. obtain.

However, as described above, since the toner image attached to the belt 9 is moved to the appropriate position on the glass window 4, the operation timing of each part of the device, such as the image writing and the stop timing of the drive motor M1, is determined by the rotation of the belt 9. It is necessary to do this depending on the location. For this reason, in the past, as shown in FIGS. 1 and 3, for example, a chain 39 is placed at a predetermined position on the side edge of the belt 9 or at a predetermined position on a chain 39 stretched near both side ends of the belt 9 and driven by the drive roller 5. Light shielding plate in position 4
0 is provided protrudingly, and this light shielding plate 40 extends 7 along the moving surface of the belt 9.
1) The rotational position of the belt 9 was directly detected from the belt 9 or the chain 38, such as by generating an operation timing signal when the belt 9 crossed the groove of the photointerrupter 41 arranged as shown in FIG.

However, since the belt 9 or the chain 39 is in the form of a band, the belt 9 or the chain 39 causes flapping (waving) perpendicular to the direction of movement during rotation, and as a result, the light shielding plate 40 hits the photo ink club 41 and is easily damaged. There was a problem. This problem is caused by the belt 9 which is a photoreceptor.
In the case where the rotational position of the belt 9 or the chain 39 is directly detected, this problem always occurs even if other detection means such as a micro switch or a Hall element are used.

[Objective] In view of the above-mentioned points, an object of the present invention is to detect a state signal (for example, a rotation detection signal of a servo motor) related to a driving means of an image bearing member such as an endless belt-like photoreceptor. It is an object of the present invention to provide an image display device that indirectly determines the rotational position, etc., and thereby eliminates the above-mentioned drawbacks caused by flapping of the image carrier.

In order to achieve such an object, the present invention provides an image display device that forms an image on an image carrier and displays the image.
Thus, the detection signal generated from the moving means for moving the image 10 carrier is used as the position information of the image carrier.

[Actual - Example] Below: Detailed description of the invention with reference to the drawings □ do. .

The fourth crystal shows one embodiment of an image display device to which the present invention is applied. Here, 50 is older than 40, which is like an endless belt. A, -y 39 pieces, I, y 7 pieces, and are attached, for example, to the joint part 51 of the belt-shaped photoreceptor 9 at position 2.

Through this plate stay 50, the rotation of the drive roller 5 is transmitted to the photoreceptor 9 from a chain 39 that meshes with sprockets I and 52 located at both ends of the roller 5.
To ensure reliable rotation of the belt-like sensation body 9 during the rotation of the belt-like sensation body 9.
: 53 is an extension shaft extending from the rotation axis of the drive roller 5; 55 is a DC servo motor for rotating the drive roller 5; its rotation is transmitted to the extension shaft 53 via a gear head 54; In this embodiment, the number of rotations of the DC servo motor 55 is aoo.

rpm, and the gear ratio of the gear head is 1/80. Therefore, the rotation speed of the drive roller 5 is 5Qrpm.

From the DC servo motor 55, a rotation detection signal (24p
uls/rotation) is output, and this signal is fed back to the motor drive circuit (17 in the figure) to control the constant rotation of the motor. Further, in this embodiment, in order to obtain the operation timing for each page, two signal generation and detection means (belt clock sensor) and a -1 rotation detection signal are used. ≠ A series of southern gears i57 to 6', o driven by → length 53 are provided, and a → type shielding plate 6 is fixed to the shaft end of the output side gear 80 thereof. And this circular light plate 6'! and the photointerchanger θ2 which passes through the light shielding plate 61□ constitute a photoencoder θ3 used as home positive scene detection means (home 1 positive scene sensor) for each page. For this purpose, the ratio of the number of teeth (gear ratio) of the double gear train is such that the light shielding plate 61 does not always make one rotation per rotation of the belt-like photoreceptor 9 or one page display. Since the structure is the same as that of the conventional device shown in FIGS. 1 to 1', a detailed explanation thereof will be omitted.

FIG. 5 shows an example of a control circuit for the image display device shown in FIG. 4, where 70 is a sequence controller;
Based on the input signals from the operation fi3 for various designations such as the start designation of the display motion f1 and the designation of the number of display beams, the motion based on the designation from the operator is recognized, and the predetermined motion is controlled and managed. 7. is a roller drive motor (DC sustainer motor) that drives the endless belt-like photoreceptor (belt) 9.
Ml) 72 driver': driver (drive circuit). This roller motion motor 7.2 has a built-in signal generator (FG)-5fl that generates a signal proportional to its rotation, and a drive motor driver that generates a signal 1 of the pull signal. 1
The roller drive motor 7
The structure is such that 2 can be rotated at a constant rate. Therefore::
The endless belt-shaped photoconductor 9° becomes a moving element moving at a constant speed.Furthermore, in this embodiment, this one-turn detection signal 9 is used as a signal to detect the position of the endless belt-shaped photoconductor 9. 1:
This number BICLK is inserted into the sequence controller 70.

In this embodiment, the row 1 drive motor 72 (711j rotational speed = 300 rpm, :roller:driver - 2nd 11.rotation) generates a signal BCLK='24, :gear of the gear head 54. 1 ratio = 1'/80, → end bevel t) Total length of U photoreceptor 9 = '11100 mm, > Luto movement al-ra 88 rotations, so that the endless belt-like i-light body rotates 1111 times. What is being done ÷
Endless belt-like photoreceptor 9- corresponding to l pulse of signal BCLK: Upper length is approximately 0.1 rm/foul'□S:
Therefore, the position of the endless belt-like photoreceptor 9 can be detected extremely accurately.

73 is a driver for the developing device motor 74 that drives the developing sleeve 35; 75 is a developing bias circuit that outputs a developing bias voltage of +200 to +300 V to the developing device 18;
The above-mentioned drivers 71 and 73 and the developing bias circuit 7
5, the on/off (intermittent) operation of each of them is controlled by a control signal from a sequence controller 70. An output signal Hp of a home position sensor (photoencoder) 63 attached to the shaft 53 of the drive roller 5 via gear trains 57 to 60 is supplied to the sequence controller 70 as an absolute position detection signal of the belt-shaped photoreceptor 9. The sequence controller 70 starts counting the belt clock BCLK by detecting this output signal HP. As a result, the sequence controller 70
determines the drive timing of each drive unit 71, 73 and 75 and determines an appropriate sequence control 9'Il for image display.
I do.

The output signal HP 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, every rotation of the belt-shaped photoreceptor 9, the light shielding plate B of the sensor 63 is
1 rotates once and when it is possible to write two pages on the photoreceptor 9, two holes 81a are provided at equal intervals in the light shielding plate 61 (see FIG. 4), thereby blocking light. Two signals HP are output for each rotation of the plate 61.

76 is the scanner 12 that scans the laser beam from the laser oscillator 11 in the main scanning direction! It is a scanner driver that drives the scanner 12, and also supplies a signal 5CNRDY indicating whether or not the scanner 12 is rotating at a constant rate to the sequence controller 70. 77 is a laser driver that drives the laser oscillator 11, and a signal La5e indicating whether or not the laser oscillator 11 has an abnormality such as a temperature control abnormality.
r RDY 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 generating circuit that detects the laser beam and generates an unblanking signal B[l]; It is a beam detector that is supplied to the circuit 78, and the beam detector 79. A synchronization signal Hs y used for synchronizing video signals in the main scanning direction transmitted from an external device (not shown) such as the image reading device 1 or an external storage device according to the detection signal BD of
Generate nc. Therefore, the above-mentioned unblanking signal and the video signal are supplied to the laser driver 77 via the or game 1-80. The unblanking signal generating circuit 78 also performs detection operations such as detecting synchronization deviation in scanning in the main scanning direction based on the detection signal BD of the beam ditch lid 78, and outputs the detection IB signal BD.
The RDY is supplied to the sequence controller 70.

Furthermore, an interface signal for communication connection with an external device is also supplied to the sequence controller I/roller 7o, so that commands or data can be exchanged with the external device.

Next, an example of the control operation of the sequence controller 70 in FIG. 5 will be described with reference to the flowchart in FIG. 6.

First, after turning on the power, each drive unit 72
．． Setting of initial state ff, to' for 74 and 18 (setting)
, and performs initialization processing such as abnormality diagnosis of each part. Thereafter, in step S2, it is determined whether or not a display start command has been issued from the operation panel 3 while monitoring the key input from the operation panel 3 and the interface signal with the external device. If it is determined that there is a display start command, the process advances to the next step S3, and the roller drive motor 7
2 to start rotating the endless belt-like photoreceptor 9,
Further, the developer motor 74 is driven and a developing bias voltage is applied to the developer 16 to enable image writing on the belt-shaped photoreceptor 9.

Subsequently, in step S4, the rotating position number 0 of the belt-shaped photosensitive sensor 9 is changed to 2, and the rotation position sensor 6 is rotated.
Monitoring the generation of the home position signal HP from 3,
When the signal HP is detected, the process advances to the next step S5 and starts counting the belt clock signal BCL' supplied from the rotation signal generator 56 of the roller drive motor 72. Here, since the signal HP indicates the reference position of the display page, from the time of reception of this signal HP, 4a
The count number of No. BCLK is predetermined and set to a predetermined value n.
The position where l is reached becomes the image writing open ← position. Therefore, in the next step S6, it is determined whether the count number of the signal BCLK has reached a predetermined value n14 days or not, and if the count number has reached 11 and it is the end, in step S7, the external equipment is Temporarily sends a signal that instructs the transmission of a signal.

In response to the sending of the Sakai signal, a video signal synchronized with the synchronization signal HS7sc is transmitted to the outside i in step S8.
The video sent from the device, good 33 minutes, 几-q
1' 54 t, 7° and -7 oscillators are used to drive and control the laser beam, and image writing on the belt-shaped photoreceptor 9 begins. Even during this write operation, the signal BCLK (
7) Continue counting 11. ．． ．． 7. -, PuS91. Hey,
No. 45 tBcLK (7) Determine whether the count number has reached a predetermined value n2. When the □curran 1° count of the signal BCLK reaches 12, it is determined that the writing process to the page section has been completed, and the process proceeds to the next step S1, where the roller drive motor 72 is stopped, stopped, and developed. device motor 7
4 and stop the output of the image bias □ bias voltage, and then step Sl
A write completion signal indicating that writing of the page specified in l is 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.

[Effects] As described above, according to the present invention, in order to detect the position of the image carrier, 1. the image carrier is driven t:,
This system uses detection signals from servo motors, etc., to prevent incorrect position detection caused by waving phenomena such as "flapping" or "deflection" of the image carrier. , 1 in the position detector, 1, 11! As a result of being able to eliminate inconveniences such as breakage, highly reliable image carrier "°"'
”.

Ru.

Furthermore, since Akira Kinaba uses the rotation detection signal of the servo motor, there is no need to install a special mechanism for determining the belt position, and the position can be detected relatively easily with an accuracy of 7% or 9h. . 8. Ladle. □(7) and the effect of being able to accurately perform each of the four operations related to Yoi, Work, Yoi 1, 1□, and 3 are also obtained.

[Brief explanation of drawings]

1 is a perspective view showing an example of a conventionally known image display device; FIG. 2 is a perspective view showing an example of a conventionally known image display device; 1 is a cross-sectional view showing an example of the internal configuration of the device shown in the figure; 1 is a perspective view showing a main part of FIG. Figure 5 is the fourth
Control circuit diagram of the apparatus shown in the figure, '1 FIG. 6 is a flowchart showing the control procedure of FIG. 5. ′
1 1... Apparatus exterior part; 1 2... Display image viewing hole (display window), 13... Operation panel, : 4... Display window glass, 5... Drive 6. -Ra, 6...Belt: Tension roller, □? , 8... Endless □ Belt-shaped photoreceptor hanging instruction low-nid 7: 960. 13,
lO...Reb beam scanning type image exposure device, 11...Semiconductor laser oscillator, 12...Polygon mirror scanner, 13...f.0 lens (fr='+ image lens), 1
4...Reflector, 15...Transparent plate, j6...Toner developer. 35...Magnetic developing brush, 39...Chain, 40...Light shielding plate, 41...Photo ink club, 50...Plate stay, 51...Joint part, 52...Sprokeft , 53... Extension shaft, ', 54... Gear head, 55... Servo motor, 56... Signal generator. Patent applicant Canon Co., Ltd.

Claims (1)

[Scope of Claims] 1) In an image display device that forms an image on an image carrier and displays the image, a detection even signal generated from a driving means for moving the image carrier is used as position information of the image carrier. An image display device characterized in that it is used as an image display device. (Hereafter, margin)