JPS6048664A - Recorder - Google Patents

Abstract

PURPOSE:To prevent recording of a picture to a recording unnecessary part by interrupting forcibly a picture signal to be supplied to the outside of an effective picture recording range by means of a signal from an effective picture recording range detecting means. CONSTITUTION:A picture signal generated in a recording information generating section 1 is fed to a semiconductor laser 20 in a recorder 3 and the picture signal modulates a laser beam. After the moludation beam is polarized by a scanner 21, the beam is exposed to a phtosensitive body on a photosensitive drum 10 via a lens 22. The position of the laser beam is detected by a beam detector 23, the detection signal is transmitted to the generating section 1 to synchronize a latent image on the drum 10 with the picture signal. A device 3 counts the number of clocks until a picture write start point CTB and a write end point CTC in the main scanning direction A, and when the detection pulse of the detector 23 does not reach the CTB and exceeds the CTC, the picture signal from the generation section 1 is interrupted. The picture signal is controlled as to the sub-scanning direction B by discriminating paper size by the signal of a switch 39 or detecting paper size by means of paper size detectors 40a, 40b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention is based on old recording devices that scan a recording medium such as a photoreceptor using an image signal to record an image.

[Prior art]

Conventionally, in this type of device, the photosensitive 1
: A latent image is formed on the ram, developed, and transferred to the recording paper, but at that time, the recording signal is not sent beyond the trailing edge of the recording paper or beyond the effective image range in the main scanning direction. In this case, a developing area is created on the photosensitive drum that is not transferred to the recording paper, and the toner developed with respect to the latent image in this area is transferred and adheres to the high-voltage charger for electrostatic heat dispersion, causing electrostatic transfer. This method reduces separation efficiency, leading to uneven image density and frequent paper jams, and has the disadvantage that the residual toner scatters inside the machine when cleaning the photosensitive drum, making clear recording impossible. there were. Furthermore, if image information is sent between each paper feed or outside the effective image range in the main scanning direction, the image data will be stored on the photoconductor, resulting in a long period of time that will shorten the life of the photoconductor and degrade the image quality. W! There was a point.

〔the purpose〕

An object of the present invention is to provide a recording device that eliminates the above-mentioned drawbacks and can obtain high-quality reproduced images.

Further, the present invention provides an image information for images outside the effective image recording range including the necessary margin portion of the circumference number U of the recording paper by linking the size of the recording paper in both the main scanning and sub-scanning directions among the image information from the recording information generating section. It is configured to forcibly block information to prevent image recording in areas where recording is not necessary, thereby preventing uneven development density and occurrence of recording paper jams,
It also aims to improve the performance of photoreceptors and improve image quality.

〔Example〕

Hereinafter, this invention will be explained based on the drawings.

FIG. 1Lll shows a schematic cross section of an embodiment in which a laser beam printing method is used as a recording device.

First, a laser beam 11 modulated by a recording signal is irradiated onto the photosensitive drum 10, which has been exposed to a single band, to form a latent image. Transfer the developed image (in line 18 of 3I'f, the transfer device 5 transfers the second developed image of the photosensitive drum 10 onto the recording paper 12).
b'r (t+y-) on the paper 12 is fixed by passing through the paper 12 and is ejected to the paper ejection tray 13. 7 is the paper strength cera) C
A paper feed roller 6 for the recording paper 12 is a registration roller for correcting misalignment of the fed paper. In the figure, 9
indicates the conveyance fL#''!I, and 19 indicates a discharge detection sensor. Note that 16.16'', 39, 40a.

40b will be described later.

2nd L< is a block diagram showing the recording method of the present invention,
The process of loading the photoreceptor 11'1 onto the photoreceptor on the drum 10 will be explained with reference to this figure. First, record the image signal of the original ↑1'1
The alarm generator 1 generates the alarm. This is a read signal from the page memory 2. The image signal of the original is stored in the temporary memo IJ-2 and sent as a serial image signal to the semiconductor laser 20 in the recording device 3, and the laser beam is modulated by this continuous image signal. 11 is generated. The modulated beam from the laser 20 is polarized by a scanner 21 and then imaged by a lens 22 to expose the photoreceptor on the photoreceptor drum 10 .

The position of the laser beam 11 scanning the photosensitive drum 10 is detected by a beam detector 23 immediately before the laser beam scans the drum in order to synchronize the image signals. This detection signal is herein named an "unblanking signal", and the output of detecting this unblanking signal is transmitted to the recording information generating section 1, and this recording information generating section generates the page memory 2 in synchronization with the signal. Since the latent image is driven, the latent image on the photosensitive drum 10 is synchronized with the image signal.

FIG. 3-1 is a diagram schematically showing an outline of the above-mentioned scanning, and FIG. 3-2 is a schematic diagram of processing in the sub-scanning direction of the recording paper. The rotational force of the scanner 210 is in the main scanning direction A.
The rotation direction of the photosensitive drum 10 is the sub-scanning direction.

In FIG. 3-1, CTB is the image writing start point, which corresponds to the laser writing start position 1γ in FIG.
C indicates the end point of this image writing, and both figures show the relative positional relationship between the position 17 and the recording paper.

Next, the operation of this embodiment will be explained using FIGS. FIG. 4 is a block diagram of recording container 3, and FIG. 7A'S5 is a timing chart showing the image writing sequence in the main/sub scan direction.
The figure shows all 11 of these 70-yards.

In FIG. 4, the buffer 32 sends various signals to the CPU 3.
0 and through which l1i- gate 45.
46 and a BD (beam detect) processing circuit 31. The driver 33 is for driving various loads, and the driver 34 is for outputting various signals to the recording information generating section 1 (21st ''''4). 1') BD processing described in u. The circuit 31 detects whether the beam detection is normal, the Zunawaji scanner 21 (21st section) rotates at a constant speed, and the optical axis of the scanning optical system is adjusted. It plays the role of blocking image information.

First, in the recording device 3, when it is determined that there is an abnormality in all the sensors etc. after the power is turned on and a predetermined state has been reached, the sixth to fourth step 1011 READY signal 51 is turned on through the driver 34, and the recording information is It is transmitted to the generating section 1.

If there is an abnormality, in step 102, 1REA
The DY signal 51 is turned off through the driver 34. At this point, when the recording information generating section 1 attempts to record,
Recording so-called alarm nEjfls l) RMST signal 4
2 (drum rotation start command) to the recording device 3, and at the same time, the recorded information generating section 1 develops the recorded information in the page memory 2, and at the time of completion, 1PREB
5 Determine whether Q becomes TRUE.

This signal is transmitted to the iDRMST4 in the recording device (ll3).
In contrast to the two-person power, the CPU 3Q controls the drum conveyance motor 44.
ONI is outputted from the CPU 30 via the driver 34 (step 105) and when an image is ready to be written at any time after controlling the potential on the photoreceptor 10 (steps 106 and 107).

In the recorded information generating section 1, the two above-mentioned events i REDY5
1 and 1PREB 5 When Q is satisfied, 1PRNsT
Outputs 43. This signal instructs the recording device 3 to feed paper and starts the copy sequence (step 108). Also, the paper feed is 11! The print enable signal 1PREB 5 Q is reset at f, and the fed paper is completely output from the cassette C entrance and is set when the next paper can be fed. 1PRNS above
In response to the T43 signal, the C)9 device 3 drives the paper feed roller 7 to feed the paper (step 111a). Cassette signals 39-] to 39 obtained by installing a size detector (paper size detection switch 39)
-m to the CPU 30 (step 109), the length of the paper to be printed in the main scanning direction and the sub-scanning direction is determined, and regarding the length in the main scanning direction, the @
In Figure 3-1, CTB (count number of oscillator 36 clocks from BD large input to main scanning direction image writing start point) is sent to main scanning direction decode f-ri 63a, and CTC (B
L) The count number of the oscillator 36 clocks until the end point of image writing in the main scanning direction is manually output to the previous data 63b (step 110).

The copy sequence will now begin, and the BD processing circuit 31, which is the subject of the present invention, will be explained.

This BD processing circuit 31 inputs the 8 bits of the clock from the oscillator 36 counted by the 8-bit counter 35, the BD multiplied signal, and the values of CTB and CTC.
When the D signal 23 is input and becomes TRUE, it outputs a waveform-shaped i-BD signal 54 with a constant frequency IAI to the recording information generating section 1, and also outputs a signal 62 that clears the counter 35.

After that, the manpower value on the counter is constant (Ei CT A (5th
j. 'II), in order to detect BD, the laser is turned on in the non-image area and the unblanking signal 5γ is turned off.
F.

The main scanning direction decode data 638.63b is a value that the CPU 30 outputs according to the paper size in the main scanning direction in response to a signal from the switch 39 provided at the tip of the cassette C as described in AiJ. 63a is as described above <B
D is the count number CTB of the clock of the oscillator 36 up to the main scanning direction image lIj insertion starting point from manual input, and 63b is the main scanning direction length of BD large input 4/9. Count r&CT of the first master clock when reaching the writing end point
It is C. The I(I) processing circuit 31 compares the counter value 48 with the counter value of the counter 63a, and if they are equal, sets the scNEm signal 61 in the main scanning direction to ■(' (high level), and outputs the recording information generating section 1. 1-VID from
Allow the EO signal 38 to pass through. Then, when the counter value 48 becomes equal to the counter value of 63b, 5CNER
-The signal 61 is set to 'L# (low level), and the 1-VIDEO signal 38 from the primary information generating section 1 is cut off. The image signal in the non-image area is blocked as described above. However, when using a manual cassette, etc., the effective image area in the main scanning direction is insufficient, so the CPU 30 sets CTB to the minimum value and CTC to the maximum value. Set the value.

Next, when the counter value 48 is CTD (FIG. 5), the semiconductor laser 20 is turned on by turning on the unblanking signal 57 for detecting BD in the non-image area.
do. In this way, when the counter value 48 is input within the BD input permissible range between CTE and the BD signal 23 is input after a little time has elapsed since CTD, the lower shoulder RT) Y signal 5F3 becomes "L", and the CPU 30 It is manually input to the gate 46, the counter 35 is cleared for one clock, and the sequence from the callan l-0 is let again.If T0n is input before CT E and C-1-F
When inputted, the BDRI)Y signal 58 becomes 1 bit, and the semiconductor laser 20 is turned on to search for a non-bit where synchronization can be achieved, and the counter 35 is cleared. At the same time, when B I) is not manually applied between C-rE and CTE, the BDRDY signal 58 becomes "■ B", the semiconductor laser 20 is ONL, and the counter 48 outputs the clear signal 62 of the counter 35 at CNT11. Turns on for only one clock.

Next, sub-scanning direction processing will be explained.

There is no problem when the paper size in the sub-scanning direction can be determined by the signal from the switch 39, but if a manual feed cassette is used as described above, the paper size in the sub-scanning direction is also indeterminate (see step 6 in Figure 6). 111b), as shown in FIG. 1, a paper size detector (reflective sensors 40a, 40b, 40a are Light source, 40b
The paper size in the sub-scanning direction can be detected based on the paper feeding function and the time from when the leading edge of the paper passes the point 16' until the trailing edge of the paper passes the same point. In this embodiment, as shown in FIG. 6-1, timer interrupt processing steps 130 to 133 and steps 112 and 11
Measure at 3.

When the leading edge of the recording paper reaches McLKA (see Figure 3-2) corresponding to the laser writing start point 17, the 1TOP signal of the image writing opening f1 signal (vertical synchronization signal) to the recording information generating section 1 is output. 49 is turned ON for one drum clock (FIG. 6, steps 114 and 115). The recording information generating section 1 starts transmitting the image information to the recording device 3 based on this signal, but within the recording device 3, the image information of the number of leading edges of the image is cut off for the above-mentioned reason. At 116, when the leading edge of the recording paper reaches position CLKR (Figure 3-2) on the side of the photosensitive drum 10, which is a number n1 from position 1γi 16, the TOPER signal 56 is set to 1H'' and 1-VI
The DEO signal 38 is passed (step 117). Furthermore, the leading edge of the paper reaches the registration roller 6 and the leading edge is moved to 10. When the paper feed roller 7 is made, the paper feed roller 7 is
i'F to drive the registration roller 6 (steps 118 and 119).

Next, the rear end of the recording paper is located at a position tFj:C on the quantity feed roller 7 side from the position 16 corresponding to the laser writing start position 17.
When the LKC (Figure 3-2) is reached (the above is achieved by the paper size determined in step 109 and step 133), the TOPER signal 56 is set to I L l to 1-V
The IDEO signal 38 is set to 0FFL, the trailing edge number u1 of the recording paper, and the leading edge number of the near 3 recording introduction 1 are set so that the laser beam is not applied to the photosensitive drum 10 except when the BDRDYf word 58 is H1, that is, when the BD is out of synchronization. is not written (steps 120 and 121).

Finally, when the trailing edge of the recording paper reaches the position CLKD (Fig. 3-2) corresponding to the laser writing start point 17, 1PRE
The ND signal 52 is turned on for one drum clock to indicate to the recording information generating section 1 that writing of one page of recording information to the photoreceptor 10 is completed (steps 122 and 123).

As a means of synchronizing the timing with the paper movement as described above, the drum clock signal 41 is set to 41! III L.

This is a signal obtained by climbing onto a gear-shaped plate member attached to the 11G optical drum 10 as shown at 15 in Fig. 21, and this signal is generated when the optical drum 10 rotates. , the gear-like plate portions t and i15 also rotate, and the peaks and valleys of each tooth block or pass the light from the sensor 14 to detect the CP.
It has already been input to the interrupt terminal of U30. Since the photosensitive drum 10 and the conveyance system move synchronously, if the moving distance of the drum 1o is calculated in the above manner, the paper movement 'jiIJ
I also put out the stem of the direct J separation.

[Other real EiD examples]

In the method of the first embodiment described so far, ζL
It is not possible to block the VIDEO signal at the leading edge of the paper, the trailing edge of the paper, and the front and back sides in the horizontal direction, but it is not possible to do so from the viewpoint of overlaying the form or standardization of the format. In some cases, adjustment may be necessary, so
In such a case, the CPU 30 will make the adjustment.
If k is manually generated, the CPU can load the corresponding 4(f) to the BD processing circuit 31 or change the quimming of TOPFJR to upgrade the recording.

In the embodiment, the recording information generating section 1 is the recording material 3.
Although it is outside of the above, it records the above-mentioned breaking news occurrence Ftil, and it is green?
Of course, there is no problem even if (jη) is formed inside i+v.

〔effect〕

As explained above, according to the present invention, the image signals of the parts other than the leading edge of the recording paper, the trailing edge, the space between each paper, and the effective image width in the main scanning direction are transmitted to the paper. Move 1jji to the size and make it strong 1jiji;+,,!Otori 11
)i (M) is achieved, so that 1jiii 1%! marking on the recording area is prevented, which prevents uneven development and recording paper jams that were unavoidable with conventional methods, and This has the effect of extending the life of the photoreceptor and improving image quality.

[Brief explanation of drawings]

1 to 6 are explanatory diagrams of one embodiment of the present invention,
FIG. 1 is a schematic cross-sectional view of a recording device using a laser beam print method, and FIG. 2 shows block lines 1q and 3-3 of the recording method.
] Figure is a (Russian diagram) of the scanning outline, Figure 3-2 is a (
“Dew! [111 run completed direction processing j ((1 de・1 type I4,
Figure 4 shows the block grinder of the recording device t [yo 11 j) 5
Indicates the sealance including image retention in the main/sub-scanning direction.
・f-timing break 1 FIG. 6 is an overall flowchart, 6-1 i71c, a flowchart showing the timer interrupt processing steps. 1...-Recorded information generating unit 3...Record device 4...Currently I'χko)7;N5...
...Transfer 'JK γ...A"Jy AGE roller 8...
...Fixing 1ull-ra 1 (1... Photosensitive drum (149 bodies) 12-... (K'rm and paper C...%jQ canut 13. ... Paper output tray 17 ... Laser writing start position; 1゛i20 ...
......Semiconductor laser 21...Scanner 30...CPU 31...BD processing f! Jj(Ro) Road 39・
...Paper size detection switch (dimension detector) 40a, 40b...Reflective sensor (paper size detection N) A...Main scanning Direction B...
...Sub-scanning direction CTB/CTC...Main scanning direction image writing start/end position CLKA, cLKB, cLKc, cL D...N
ft1 scanning direction each paper position it! 'i4 Figure 7? Figure 2"-- -3 Figure 3-7 Figure 3-2 Beko

Claims (3)

[Claims] (1) A recording device that records an image by scanning a recording medium using an image signal, which has means for detecting an effective image recording range, and the effective image is transmitted from a recording information generating section by the output of the detection means. A recording device characterized by comprising means for forcibly blocking an image signal from outside a recording range. (2) The recording apparatus according to claim 1, wherein the detecting means is a paper size detecting means disposed in a paper cassette section. (3) The recording apparatus according to claim 1, wherein the means for forcibly cutting off image signals outside the effective image recording range is configured to synchronize with the movement of the recording medium.