JPS6084563A - Image display device - Google Patents

Abstract

PURPOSE:To form an image correctly in a photosensitive area except at the seam of a photosensitive belt by counting the length of the deviation of the seam from a stop position, and shifting an exposure start point of time by the length in the next image formation. CONSTITUTION:The endless photosensitive belt 9 formed by laminating a vapor- deposited metallic layer and a photoconductive layer on a transparent sheet rotates while extended among rollers 5-8. An image is formed by the toner development of the image signal exposing and developing device 16 through the scanning optical system 10 including a laser 11 and a polygon mirror 12, and observed through a window 4. The hole 61a of a disk 61 which rotates synchronizing with the movement of the photosensitive belt 9 is detected to discriminate that the seam 51 of the belt passes a prescribed position. Thus, reference pulses of a belt driving motor are counted to know the movement extent of the belt, so the deviation of the seam 51 from the constant stop position is clear.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an image display device that forms an M image on an image carrier;
In particular, it concerns its operation sequence.

[Prior art]

2. Description of the Related Art Conventionally, display devices have been devised that form an image on an endless belt-like photoreceptor and display the image.

This conventional device will be explained using FIGS. 1 to 3.

1 is a vertical device exterior cylinder, 2 is a display image viewing port formed in a large opening on the front plate surface of the exterior cylinder l, and 3 is an operation panel with the lower part of the front plate protruding forward and disposed on the upper surface thereof. , 4 is a display window glass pasted in the window hole 2, 5, 6, 7 and 8 are two each at the upper and lower parts of the outer cylinder l, parallel to each other with their axes in the left and right direction of the outer cylinder, and individually. Four endless belt-like photoreceptor suspension support rollers are disposed with bearings for free rotation, and reference numeral 9 designates an endless belt-like photoreceptor that is suspended and supported by the four rows 5 to 8.

The endless belt-shaped photoreceptor 9 (hereinafter simply referred to as a belt) has a base layer made of a transparent sheet such as a polyester sheet, and the outer g! By depositing a very thin layer of metal on the four sides to provide conductivity while substantially maintaining transparency, a photosensitive material layer (photoconductive layer) such as Cd8 is formed on the metal-deposited side. It is entirely flexible and is suspended and supported by the four rollers mentioned above with the photosensitive material layer side facing outside.

Reference numeral 10 denotes a laser beam scanning type image exposure device that is fixedly arranged in the inner space of the hanging belt 9, and includes a semiconductor laser transmitter 11, a polygon mirror scanner 2°FA lens (imaging lens) 131, a reflection ring 14, and a transparent plate. 15. The transparent plate 15 includes the above-mentioned belt suspension support roller and 8.
It is a horizontally long transparent flat plate made of glass or plastic that is placed in pressure contact with the inner surface of the tension belt part between them with an appropriate amount of force.

Reference numeral 16 denotes a toner developer disposed on the outer surface of the belt 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 plate 15, and are in suppressed contact with the inner surface of the belt 9.
JXX and 152 are chamfered and rounded so that the belt 9 can come into contact with each other smoothly. Also, this transparent plate 1
Reference numeral 5 indicates the up and down movement of the rotating belt 9 and the developing device 16.
The vertical vibration of the belt 9 caused by contact with the magnetic developing brush 35 is prevented, the exposure position is kept constant, and the φ force is increased.

39 is a chain stretched at a predetermined position on the side edge of the belt 9 or near both side ends of the belt 90 and driven by the drive roller 5; 40 is a light shielding plate protruding from a predetermined position of the chain 390; An operation timing signal sound is generated when the 404N belt 9 crosses the groove of the photo interrogator 41 disposed along the moving surface.

-1 However, in this type of device, the stopping position of the belt is not constant due to inertia and may shift, and this shift may accumulate and the belt seam may appear on the image display screen, resulting in an unsightly image. Ta.

〔the purpose〕

Therefore, one object of the present invention is to eliminate the above-mentioned drawbacks and obtain an easy-to-see image. That is, in an image display device having a rotating image carrier and displaying an image on the image carrier, means for generating a signal requesting image information, means for detecting the rotational position of the image carrier, The present invention is characterized by comprising means for shifting the output timing of the image information request signal according to the stop position of the one image carrier in displaying the previous image.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 4 shows an example of the configuration of the image display device of the present invention. Parts common to the conventional example are designated by the same numbers. Here, 5
0 is a plate stay that connects the endless belt-like photoreceptor 9 and two chains 39, for example, the joining s of the belt-like photoreceptor 9.
Install it at a position such as 51.

Through this plate stay 50, the rotation of the drive roller 5 is transmitted from the chain 39 meshing with the sprockets 52 attached to both ends of the roller 5 to the photoconductor 9, and the rotation of the drive roller 5 is transmitted to the photoconductor 9. Ensure proper rotation. Further, the number N of meshing portions of the chain 39 (required number of links) is set to be a common multiple of the number Z of teeth of the tin rocket 52 and the number P of pages of images that can be displayed by rotating the photoreceptor 901.

For example, when the number of teeth Z of the sprocket 52 is "25" and the number of pages Pb% is "2", the number N of meshing parts of the chain 39 is set to 1200". This allows the position of the teeth of the sprocket 52 to be t''IK can be maintained in a constant correspondence with the position of the belt-shaped photoreceptor 9 and the page display position on the Pez-shaped photoreceptor 9.

Reference numeral 53 denotes an extended extended track extension shaft 5 that is the rotation axis of the drive roller 5.
3, a circular light shielding plate 61t' is fixed to the shaft end of the output gear 60,
This circular light-shielding plate 61 and a photointerrupter 62 passing through the light-shielding plate 61v constitute a photo encoder 63 used as home position detection means (home position sensor) for each page. Therefore, the ratio of the number of teeth (gear ratio) of the gear train described above is set so that the light shielding plate 61 always rotates once for each rotation of the belt-shaped photoreceptor 901 or the cycle for displaying one page. For example, number of teeth Z=25, number of pages p
= 2, number of chain meshing parts N = 200,
If the tooth ratio is set to GYI/8, the light-shielding plate 60 rotates once for each rotation of the belt 901, and the home position detection signal for each page can be generated from the photointerrupter 62.

Among the four rollers 5 to B, roller 5 is used as a driving roller to transmit the rotational force of a motor Ms (not shown), If, b
. The Konomotor MIK has a built-in pulse encoder and is used as a signal generating means (belt clock generating means) to obtain the operation timing for each page. At least one of the other three rollers 6 to 8, for example roller 6, acts as a belt roller and applies tension to the suspended belt 9. Therefore, the drive roller 5 is driven by the motor M1! When the belt 9 is rotated counterclockwise in FIG. 2, the suspension belt 9 rotates counterclockwise without slack or slip. Along with this rotation, rollers 5 and 8
In between, the tension side outer surface of the belt 9 moves past the display image viewing hole 2 from the bottom to the top.

In the image exposure device [10, an intermittent laser beam L corresponding to time-series electric pixel signals supplied from an electronic computer, an image reading device, etc. is transmitted to a semiconductor laser transmitter 11 in the front of the drawing.
The laser beam is oscillated toward the rotating polygon mirror scanner 12 at the rear of the drawing.

The laser beam L incident on the scanner 12 is swung in the belt width direction, enters the inner surface of the belt 9 between the rollers 7 and 8 through the path of the fθ lens 13, the reflector 14, and the transparent plate 15, and is emitted as a laser beam in the belt width direction. Beam scanned. 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 to perform image exposure with a laser beam from the inner surface of the belt.

First, after setting the required conditions such as calling up the image information and specifying the image display position by operating the buttons on the operation panel 3, the belt 90, which is the photoreceptor, rotates at a predetermined speed when a key is pressed to command the start of display. is started. 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 16 acts on the outer surface of the belt, so the belt 9
Toner images corresponding to the exposed images are sequentially formed on the outer surface of the toner image. The toner image b formed on the outer surface of the belt ζAs the belt rotates, the displayed image is rotated from bottom to top to the viewing window hole 2g5 and moved to the specified window range position, and once the belt 9 is moved, the circumferential movement of the belt 9 is stopped. will be stopped.

From this K, an image Kli is displayed on the window hole 2, and the image is visually recognized through the display window glass 4v. Next, when the belt 9 is rotated again by a belt re-rotation operation 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 a developing brush 35, and immediately after this cleaning, it is subjected to simultaneous exposure and development again. As a result, a new toner image is formed.

In this step 5, the image information is reproduced and displayed as a toner image,
In addition, since the image exposure is performed using a very narrow laser beam L4, it is possible to display high-resolution images that can clearly display fine characters and other images, and also allows for the simultaneous exposure and toner application method. Because of this, it has an extremely simple configuration that does not require corona charging means or special cleaning means, and a highly reliable display device that can be manufactured at a relatively low cost even with a large screen and has less failure and photoreceptor deterioration. obtain.

Therefore, in this embodiment, Hiki's endless belt-shaped image display device (hereinafter referred to as "soft display") is combined with an image reading device (not shown), and the image one-break signal request software obtained by the image continuation device is used. This is received on the display V and is visualized and displayed. Figure 5 shows a block diagram of the sequence control section of the soft display gray.
8 are detailed timing charts of this sequence control section.

The sequence control section shown in Figure 5 mainly consists of a counting circuit A106 and a counting circuit B107, which count the clock A and the clock Bi, respectively, and output the required signals at appropriate timing. Each of the clock selection circuits (813LA, 8ELB) 104 and 105 selects either the reference clock from the reference clock generator 102 using a well-known oscillator or the belt clock (BELTeLK) at specific timing, and .

Clock B is manually input to each counting circuit. BFfLTCLK is a clock output from a pulse encoder 113 built into the motor 112 that drives the belt. The preset circuit 103 is a circuit that generates a preset value for the counting circuit A106. The hand value of the counting circuit B107 that counts the clock Hg is inputted manually to the timing signal generation circuit 108, and V8YNC', MIN, MUTO'F are set according to this count value.
3 out of any one of the following. The M(,)N, MOF'F signals are input to a drive circuit 111 that drives each drive section 7a1' of the soft disk 1/i. This drive circuit 111 includes a belt drive motor,
Drives the developer motor and visual bias. The belt drive motor 112 is controlled in speed by a signal χ from a built-in pulse encoder 113 fed back to the drive circuit 111, and rotates at a constant speed.

Reference numeral 110 is a device used in a soft display to detect the usable state (hereinafter referred to as RD Y-shaped radiation) of a semiconductor laser oscillator (11 in FIG. 4) and a polygon Z ray scanner (12 in FIG. 4). It is a judgment circuit. 100
is the home position (hereinafter referred to as HP) sensor (i'f
There are 5 circuits (42 in Figure 4) that shape the waveform of the IP signal detected.

101 is an IIP (bar counting circuit, HP counter), and this circuit detects abnormality I/k when the photoreceptor belt 9 continues to be driven due to some abnormality. Ruiha HP Cow/Ri 10
Abnormal operation of the photoreceptor belt detected by No. 1 (This is a PUN signal generator that is triggered by No. 1 and outputs the I'ON signal. No. 114 is a pulse generator based on Wanku-Nit Multivibrate, and PON No. 4δ is a pulse generator that outputs an I'ON signal. ) L-8 flip-flop 114, 11
5'Y set.

6. Concrete operation of the sequence control unit. This will be explained below using the tie charts shown in FIGS. 7 and 8.

Sequence control operations can be roughly divided into two: power-on and normal operation, that is, when both pupil signals are being received from the reading device. FIG. 6 is a timing chart when the power is turned on. When the soft display is powered on, the photoreceptor belt is rotated forward and the photoreceptor belt (V) is stopped at a predetermined position.

Then, when the laser and scanner enter the RDY state after the end of the previous rotation, the soft display gray can be used.
R, l) Y signal '@ is output to the image reading device.

In FIG. 6, Vcc is shown in terms of power supply voltage.

When Vcc is turned on, the power supply voltage is stabilized due to the delay effect caused by it C in FIG. The counting circuit B107 starts counting the stitches of the clock B by the rising edge of the PUN signal. At this time, the clock B is set in the it-s flip-flop 116 by the action of the FUN signal, and becomes the reference clock by selection of the 5ELH 105. Counting circuit H107
However, when 8g of PC clocks are counted, the timing signal generator 57 outputs a MON signal to the drive circuit 111,
Start driving the belt drive motor. At this time, the counting operation of the counting circuit B is stopped. This operation starts the rotation of the photoreceptor belt, that is, the pre-rotation.

Thereafter, when the photoreceptor belt rotates a certain distance, the HP detection circuit 100 detects the UP signal, and in synchronization with this, the preset value is transmitted from the preset circuit 102 to the counting circuit A106, and the counting circuit A106 starts counting operation. At this time, clock A becomes the reference clock due to the action of the PUN signal. When Pa clocks A (Pa is equal to the preset value) are counted, the DRFiQ signal is output,
This D RE Q' times the signal count jli! The counting operation of B107 is started.

At this point, clock B is the reference clock as in the previous state. After counting Pa clocks BQ, the counting circuit Bl 07 outputs V from the timing signal generator 108.
Outputs the SYNC' signal. The PON signal becomes valid [
(that is, when the power is turned on), 1Ifr V 8 Y
The NC' signal is used as a counting operation start signal for the tta circuit B107. At the same time, V 8 Y N C'
The clock B is switched from the reference clock to the belt clock (BELTCLK) by the double signal. Therefore,
After outputting the v s Y N c' signal, the counting circuit B107 starts counting the belt clock (BBLTCLK) again. At this point, the photoreceptor belt is being rotated at a constant speed from the start. The counting operation of the counting circuit B107 is performed by the belt clock (t3
ELTCLK) or Pe until BEI.

When TCLK reaches the number of Pe, a MOF'F signal is output from the timing signal generator 108, and the driving of the photosensitive belt is stopped. Further, the MUFF signal enters the PON signal generator and stops outputting the PUN signal. Since the soft display is configured such that the llP signal is detected just before the photosensitive belt stops, the MOF'F (just before the i signal is output) is manually input to the IP multiplication signal counting circuit A106. The counting circuit A106 executes loading of a preset value by the HP multiplication signal and starts counting operation. Further HP
The clock A is switched from the reference clock to the belt clock (BEL T CL K ) by the signal, and the counting circuit A106 switches from the reference clock to the belt clock (BEL T CL K ).
CTjK) will be counted. This counting operation is stopped by the belt clock (B) when the photosensitive belt is stopped.
The counting operation is interrupted because E L 'l'' CL K ) cannot be obtained. Therefore, the count value of the counting circuit &60
This corresponds to the distance traveled by the photoreceptor belt after the P signal was input manually. The above operation is almost the same as the normal operation when displaying image information, and the difference from the normal operation is that the signal DST sent from the image reading device and the V8YNCv sequence control section are uniquely generated. let me,
This is because a forward rotation operation is executed. That is, the PUN signal becomes the D8T signal, and the V 8 YNC' signal +56'-
Corresponds to V8YNC signal. During the pre-rotation operation, the RDY signal indicating that the software display is ready for use in the image reading device is forcibly disabled by the PUN signal inverted by the inverter, and after the pre-rotation is completed, the PUN
If the signal disappears and the V-za and scanner are in the RDY state, the RDY signal is valid.

Next, the normal operation sequence will be explained with reference to FIG.

First, the signal D8 instructs the soft display to start operating.
T is manually input to the soft display from an image reading device (not shown). In the soft display, the counting circuit A106 and the counting circuit B108 simultaneously start counting operations in response to the DST signal.

As explained in the operation sequence at power-on, the counting circuit A 106 (r-lock A is the reference clock based on the HP multiplication signal) has a count value that is equal to the IP signal detection position in the previous operation. Place 11 of photosensitive belt stopped from 1m
The value corresponds to . Preset value Ppre
, [The value counted from when the I P signal is detected until the photoreceptor belt stops 'jr: PR, counting circuit AlO
If the total count number of 3 is 7Pfull, the count number Pe until the D8'lr signal is input manually and the stitch number circuit A106 outputs the D1 (HQ' signal is Pe = Pfull.
-(Ppre 10Pa). Therefore, the count value PB
The relationship is such that when inverse KPB becomes large, count value Pe becomes small, and when inverse KPB is small, Pe becomes large. As a result, variations in the stop position due to the inertia of the photosensitive belt or
It is possible to absorb variations in the time from the DRIilfQ signal instructing not to output the image signal until the V8YNC signal indicating the leading edge of the image signal is input to the soft display. In other words, HP 4 indicates the absolute position on the photosensitive belt.
If the stop position of the photoreceptor belt is short from ##, I)
By delaying the output timing of the 3Q signal (from the B T signal to the D signal) and advancing the output timing of the DRgQ signal, the cumulative error of the stop position deviation of the photoreceptor belt is eliminated, and the photoreceptor belt is always The seam is located outside the effective image area.

The counting circuit B107 counts the reference clock whose clock B is selected by DOT1, and when the counted value reaches Ph, the timing signal generator 108 outputs the MON signal and starts driving the photosensitive belt. Then, in response to the DREQ signal, (V8YNC) is sent from the image reading device.
In response to the signal, the counting circuit B107 starts the stitch count operation again. At this time, clock B is set to D by the VSYNC signal.
It is ELTCLK. After the counting circuit B107 finishes counting the number of BP)LTCLK corresponding to the valid image area, the timing signal generating circuit 108 generates a MOFF signal to stop the photosensitive belt Y.

This operation ensures that the image display position always maintains a constant positional relationship with respect to the display screen. Counting circuit A106
The preset value is loaded and the number of stitches of BELTCLK is determined by the HP multiplication signal detected immediately before the photosensitive belt stops.As mentioned above, when the photosensitive belt stops, the time from the IP signal detection until the photosensitive belt stops It holds a count value corresponding to the traveling distance of the photosensitive belt. Next, the abnormal operation detection means and processing of the photosensitive belt by the HP counter 101 will be described. This abnormal operation is shown in a timing chart in FIG. 8 regarding the detection and processing means when the photosensitive belt continues to be driven due to noise or other causes.

The HP counter 101 is cleared by the rising edge of the D8T signal transmitted from the image reading and reviewing device (8th
(■ in the figure). After this clearing operation, the detected HP multiplied signal is counted, and in this embodiment, when the counted value reaches 3 pulses, it is detected as an abnormal operation of the photosensitive belt (■ in FIG. 8). When this abnormality is detected, the HP counter 101 outputs an output to the ACNTCN PUN signal generator 109. At the same time, the RDY signal output to the image reading device is invalidated to notify that the soft display ray is unusable. Here, the PUN signal generator 109 is ACNTCN
As a result of the above-mentioned process, sequence control is performed to perform the same process as that at the time of power-on described above, that is, the pre-rotation process (■ in FIG. 8). In other words, by performing the pre-rotation process when the power is turned on, an operation is executed to stop the rotation of the photosensitive belt due to an abnormal operation at an appropriate position.

After executing the above process, at the same time as the PON signal is released,
ACNTCN is released and the RDY signal becomes valid. Note that ■ indicates normal operation.

〔effect〕

As described above, according to the present invention, the output timing of the image information request signal is shifted according to the stop position of the image carrier in the previous image display. The image can be displayed at an appropriate position on the image carrier without being exposed to the image, and an easily viewable image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the external appearance of a conventional device, FIG. 2 is a sectional view showing an example of the internal configuration of the device shown in FIG.
0-1 314 is a partially cutaway perspective view of an example of the configuration of the image display device of the present invention, and FIG. 5 is a perspective view of the control section of the device shown in FIG. 4. FIG. 2, FIG. 6, FIG. 7, and FIG. 8 showing an example of the configuration are time charts showing the operation of the control section in FIG. 5. 2 To 2 Ko 1 Figure 2

Claims (1)

[Claims] An image display device having a rotating image carrier and displaying an image on the image carrier, comprising means for generating a signal requesting image information, a means for detecting a rotational position of the image carrier, and an image display device for displaying an image on the image carrier. An image display device comprising: means for shifting the output timing of the image information request signal according to a stop position in displaying an image on the support body.