JPS60242145A - Recording device - Google Patents

Abstract

PURPOSE:To enable a laser printer to continuously carry out its recording operation by its manual insertion mode, by automatically changing over the mode of paper supply into its manual paper feed mode when papers in a paper storage sectioi are completely consumed, and by indicating the size of the papers. CONSTITUTION:Papers having respective sizes stored in upper or lower stage cassettes 317, 321 are one by one by means of paper feed rollers 318, 322, and transmitted through a regist roller 329 onto a photosensitive member 301 by which a toner image set by a laser beam from an information recording means 311 is transferred onto the paper. This image transfer is repeatedly carried out. When papers in the cassette 317 or 321 are completely consumed, switches 319, 323 detects no papers in the cassette, and automatically changes over the mode of paper supply into the manual paper insertion mode effected by a manual insertion feed roller 327 while the present mode and the corresponding size of papers detected by cassette size switches 320, 324 are indicated on a display section. Thus, is is possible to aim at enhance the efficiency of recording operation.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention records recording information sent from an external device on a recording medium, and includes means for supplying the recording medium from nine media storage units. The present invention relates to an apparatus including means for manually feeding a recording medium.

[Technical background of the invention and its problems] A recording device can be supplied with paper from a small cassette that stores multiple sheets of paper as recording media, and the paper can be supplied manually by an A verator. There is something that has been made possible.

By the way, conventionally, in this type of recording device, when the paper stored in the paper storage section runs out, the paper storage section must be removed, the paper stored in the paper storage section, and the paper storage section reinstalled. Recording could not continue. For this reason,
There was a problem that the recording work was complicated and the processing took time.

[Objective of the Invention 1] The present invention has been made in view of the above-mentioned circumstances, and provides a recording device in which a recording medium can be manually supplied immediately when the recording medium runs out in the medium storage section. The purpose is to

[Summary of the Invention] In order to achieve the above object, the present invention provides an apparatus for recording information from an external device onto a recording medium by beam scanning, which includes a recording medium storage section that stores a plurality of recording media;
Recording medium manual supply means for manually supplying the recording medium;
a conveying means for guiding a recording medium to a recording position; a medium presence/absence detection means for detecting the presence or absence of a medium in the recording medium storage section; a size detection means for detecting the size of the medium storage section; When detecting the absence, the operation of the conveying means is stopped, the mode is switched to a mode in which a recording medium of the same size is conveyed from the medium manual supply means, and the fact that it is in manual supply mode and the medium size are displayed on the display section. The invention is characterized in that it has a control means.

(The following is a margin) [Embodiment of the Invention] Hereinafter, a description will be given with reference to an illustrated embodiment to which the present invention is applied.

FIG. 1 is a block diagram of a system for recording information on a recording medium by a laser beam. Information from a host system 1 (electronic computer, word processor main unit, etc.) that supplies information is given to a data control unit 2. The data control unit 2 converts the information given from the host system 1 into data corresponding to dots and stores it in the page memory.

This stored dot image data is transferred to the print control unit 10.
Send to 0.

The print control section 100 writes the input dot image data onto a recording medium by modulating a laser beam, develops and transfers it, and prints the dot image data on a recording sheet.

FIG. 2 shows a detailed view of the mechanism of a printer 300 with a video interface.
It has a built-in printing control section 100 shown in the figure.

In FIG. 2, 300 is the printer body, 301 is
A photoreceptor 302, which is a recording medium for recording information with a laser beam, is a charge removal lamp for removing the charge on the photoreceptor 301 to an initial state, and is composed of a plurality of red LEDs. Reference numeral 303 is a static elimination lamp for increasing transfer efficiency, and like the static elimination lamp 302, a plurality of red L
It is composed of ED. A charger 304 uniformly charges the photoreceptor 301 to a predetermined potential.

305 is a thick transfer chiller for transferring the toner developed on the photoreceptor 301 onto paper, and 306 is a peeling charger for separating the paper after transfer from the photoreceptor.

307 is a developing device for developing an electrostatic latent image written on the photoreceptor 301 by a laser beam;
08 is a component of the developing device 307, and is a magnet roller for attaching the toner to the electrostatic latent image on the photoreceptor 301, which rotates in the direction of the arrow.

309 is an auto toner probe that comes into contact with the developer of the magnetic roller and measures the toner specific density of the developer, and 310 is a cleaning blade that removes toner remaining on the photoreceptor 301 after transfer. .

311 is the video data input from the data control unit,
A laser scanner unit is an information recording paper means for scanning, modulating, and recording a laser beam on the photoreceptor 301, and 312 is an octahedral polygon mirror for guiding the laser beam from a laser diode onto the photoreceptor 301. , 313 is a scan motor for rotating the polygon mirror 312 at high speed, and 314 is an f/θ lens for keeping the scanning speed of the laser beam on the photoreceptor 301 constant. 315 and 316 are reflecting mirrors for guiding the laser beam from the scanner unit 311 to the photoreceptor 301.

317 is an upper cassette that is a recording medium storage unit that can store 500 sheets of paper (recording media); 318 is an upper paper feed roller for taking out sheets one by one from the upper cassette 317; The upper paper out switch 320 is a 4-bit upper cassette rise detection switch (detection means) provided in the upper cassette 317 to detect a size identification mark. Reference numeral 321 indicates a lower paper feed roller, 323 indicates a lower paper out switch, and 324 indicates a lower cassette size detection switch. In addition, the upper section can store 250 sheets of paper from the lower section, and can also be used with cassettes.

Note that paper also serves as a medium for recording images, so it can also be referred to as a recording medium.

326 is a manual feed switch that detects the paper inserted from the manual feed guide 325, which is a manual feeding means;
Reference numeral 27 denotes a manual feed roller for conveying the paper after insertion is confirmed by the manual feed switch 326, and 328 is a manual stop switch for detecting the paper conveyed by the manual feed roller 327. .

Each of the paper feed rollers constitutes a paper transport means.

Reference numeral 329 denotes a registration roller for synchronizing the image developed on the photoreceptor 301 and the paper.

330 is a conveyor belt for conveying the paper separated by the peeling charger 306 to a fixing device; 331 is a fixing device for fixing the transferred toner on the paper;
332 is a fixing roller, 333 is a heater lamp for heating the fixing roller, 334 is a thermistor for detecting the surface temperature of the fixing roller, 335 is a discharge roller, and 336 is a sheet discharged from the fixing device 331. Reference numeral 337 indicates a cooling fan for cooling the inside of the printer 300, which is a paper discharge switch for detecting paper, and reference numeral 338 indicates the charging charger 304 and the transfer charger 305. A high-voltage transformer that generates high voltages to be applied to the peeling charger 7306, the developing device, and the magnet roller 308, respectively.

339 is a power supply device that generates DC voltages used for each control, and 340 is a PC board unit that controls the printer 300.

342 is a photoconductor 301 provided near the photoconductor 301;
A thermistor with extremely low thermal resistance is used in a drum temperature sensor to detect the temperature of a drum.

FIG. 3 is a perspective view schematically showing a portion for recording information on the photoreceptor 301 using a laser beam. In FIG. 3, a laser beam emitted from a semiconductor laser 344 is corrected into parallel light by a collimator lens 343, and the parallel light is applied to one surface of an octahedron of a polygon mirror 313. Since the polygon mirror 313 is rotated at high speed in the direction of the arrow by the scan motor 312, the laser beam incident on the polygon mirror passes through the [.theta.
48 ranges are scanned from left to right. A portion of the laser beam within the beam scanning range 348 is reflected by the fouling mirror 3
45 to a beam detector 346. Therefore, each time one horizontal scan by one surface of the polygon mirror 313 is performed, the beam detector 346 detects the laser beam being scanned. Further, the laser beam that is not incident on the reflection mirror 345 within the beam scanning range 348 is irradiated onto the photoreceptor 301 . In FIG. 3, the location where the laser beam is scanned on the photoreceptor 301 is shown at 349. 30
4 represents an electrostatic charger, and 347 represents a sheet of paper. As shown in FIG. 2, in an actual printer, the laser beam that has passed through the f/θ lens 314 is not directly irradiated onto the photoreceptor 301, but is reflected by reflection mirrors 315 and 316. However, in FIG. 3, for convenience, the reflecting mirrors 315 and 3 are
16 is not shown in the figure, and the photoreceptor 301 is directly irradiated with a laser beam that has passed through the f/θ lens 314.

Here, the configuration of the reflecting mirror 345 will be explained with reference to FIG. 42. As shown in the figure, this reflecting mirror 345 is attached to a supporting member 45 located outside the beam area.
Attach C to 6 with screws 455 via plate spring 454.
A fine adjustment screw 457 is provided at the bottom of this leaf spring 454, so that the angle of the reflecting mirror 345 can be changed.

As is clear from FIG. 2, the laser scanner unit shown in FIGS. 3 and 42 is shielded from the outside to prevent the scanning beam from leaking. The results of beam detection by the beam detector 346 are displayed at appropriate positions on the scanning panel shown in FIG.

FIG. 4 is an explanatory diagram of the registration roller front pass sensor 394. Manual stop switch 3 in Figure 2
28 only detects manually fed paper, whereas the purpose of the registration roller front path sensor 394 is to detect paper during paper feeding from a cassette. In FIG. 4, the paper fed from the upper cassette 317 and the lower cassette 321 by either the upper paper feed roller 318 or the lower paper feed roller 322 is fed along the paper guide plate to the registration roller 329. be done. At this time, if paper feeding is carried out correctly, the light emitted from the light emitting diode 393 is blocked by the paper and no light enters the registration roller front path sensor 394, so that the fed paper can be confirmed. Furthermore, if the paper is not fed correctly, the paper does not reach the position of the registration roller front path sensor, and the light from the light emitting diode 393 continues to enter the registration roller front path sensor. ,
It can be recognized that paper has not been fed.

FIG. 5 shows a reversing tray 381 which is an optional unit.
FIG. Normally, the printer 300 is equipped with a non-reversible tray 397 as shown in FIG.

When using such a non-reversing type, the first printing paper will be on the bottom side, so the information delivery device (post system 1) will have to send data from the last page, so the host There is a drawback that the method of filing information in system 1 becomes complicated. Therefore, the book reversing tray 381 is indispensable in order to compensate for the above-mentioned drawbacks.

In FIG. 5, the paper that has passed through the paper ejection roller 335 of the printer 300 is transported by transport rollers 382 and 383.
The sheet is stored in the tray 384 in an inverted form from when it passes the sheet discharge roller 335.

Therefore, since the printing side of the paper is on the bottom side, the first page is on the bottom side, but if you take out the paper from the tray 384 and turn the printing side of the paper on the front side, the first page will be on the top side and the last page will be on the bottom side. The page is on the lower side, and the above-mentioned drawbacks of the non-reversible tray 397 can be solved. In the figure, 385 is a paper stopper that can be slid according to the length of the printing paper in the conveyance direction. 388 is a paper holding actuator for preventing the paper stored in the tray from floating; 395 is a paper ejection switch for confirming that the paper is properly stored in the tray 384; 391 is a paper holding actuator for preventing the paper stored in the tray 384 from floating; A light emitting diode 392 is a light-receiving side tray sensor for checking the presence or absence of a light emitting diode. The presence or absence of paper 390 can be detected by shining light on 392 .

The other side of the paper presence/absence and paper full detection section is shown in FIG. This causes the actuator 38 to rotate around the pivot point 386.
8 is provided, and a lever 398 is provided in series above,
The tip of the lever 398 is biased in one direction by a solenoid 389 as a separating means and a coil 387 as a releasing means, and the lever 398 is moved depending on the state in which paper is stored in the paper storage section 390. The state is detected by detection means such as a plurality of sensors 401 and 402. The various states of the actuator 388 (the position of al is "full of paper", the position of a2 is "with paper",
The position a3 becomes "out of paper". The separating means 3
89 separates the actuator 388 at least while the paper 390 is being discharged into the paper output tray 384, and activates a solenoid in synchronization with the current status signal when the paper should be detected, for example, during a printing operation or when the paper is stopped. 389 is turned off, the separation of the actuator 388 is released, and a sensing operation is performed. Therefore, the discharging leading edge of the paper 390 does not collide with the axle plate 388, and the discharging operation is not hindered.

Note that each sheet of paper sent into the paper output tray is detected by the paper output switch 395, and the contents are counted by the paper output memory counter (R△M107 in FIG. 13), which will be described later, to detect the number of sheets. Ru. When the paper becomes "full", it is displayed on the tray full lamp 358 in FIG. 6, and the memory counter is cleared.

FIG. 6 is a detailed diagram of the operation panel of printer 300.

In FIG. 6, 350 is a 1-button cover of the printer 300, 351 is a front cover, and 352 is a maintenance cover.
When a paper jam or toner replenishment occurs, open it in the direction of the arrow to process it. In addition, the maintenance cover 35
2 has a structure that can be opened from the top, but the structure is such that it cannot be opened unless the front cover 351 is opened in the direction of the arrow, to prevent erroneous operations by the operator.

353 is a 6-digit mechanical counter, which is incremented by 1 each time a sheet of paper is printed. 354 is a select switch for selecting online/offline, and 355 is a select lamp that corresponds to the select switch 354 and lights up when online.

356 is a 1-digit seven-segment LED that displays the error details when a serviceman is called, the mode number when in maintenance mode, etc., and 357 is a power lamp that indicates that the printer 300 is powered on. , 358 is a tray full lamp that indicates that the inverted tray unit 381 is full of printing paper;
9 is a color L C that displays details of the printer's operating status.
D indicators are shown respectively. The total counter 353 to LCD display 359 described above are constantly operated or displayed. Next, the parts that cannot be operated, such as pressing the maintenance cover 352, will be explained.The following parts are operated only by service personnel.

403 is a maintenance switch for selecting maintenance mode and replacement mode; 406 is an indicator lamp indicating that the device is in maintenance mode.

Reference numerals 4 and 07 indicate an indicator lamp indicating that the exchange mode is in effect; 404 indicates a selection switch for selecting the operation mode No. in each mode; 408 indicates a selection lamp indicating that the selection switch 404 can perform a selection operation; 405 360 is a main exposure adjustment volume to be described later, and 361 is a seed exposure adjustment volume. . Further, both the volumes 360 and 361 have a structure in which an adjustment screwdriver is inserted and turned, and cannot be turned by hand with the maintenance cover 352 open.

FIG. 7 is a detailed diagram of the ICD display 359, and the functions of each display segment i will be described below.

371.372 is a segment indicating the standby, ready state, etc. of the printer 300. When waiting until the fixing unit is ready, both 371 and 372 are lit, in the ready state, only 371 is lit, and during printing operation, both 371 and 372 are turned off. .

373 blinks every time a jam occurs in the paper feeding section, and a segment indicating the paper feeding status also blinks on the same station. .

That is, the manual feed designation 365 blinks in the manual feed mode, the upper cassette 364 blinks in the upper cassette mode, and the lower cassette 363 blinks in the lower cassette mode.

374 blinks if there is a jam in the conveyance system (registration roller 329 or later). Nowadays, just like when there is a paper jam, the paper feed segment also blinks and covers at the same time. 375 blinks when the toner bag (not shown 41) is full of toner collected by the cleaning blade 310 in FIG. 376
1 to ner hopper (not shown) of the developing device 307
Flashes when there are no more 1-No-. 377.378
flashes when a serviceman error described below occurs. 379 blinks when an operator call, which will be described later, occurs. 380 blinks if there is no paper in the selected cassette. 362 displays the size of the selected paper. For example, if the - side is selected for the paper cassette L~, A4-R lights up if it is an A4 vertical paper cassette, and if 86 is selected in the manual feed mode, 86 lights up. 363 lights up when the lower cassette is selected, 364 lights up when the upper cassette is selected,
365 lights up when manual feed is selected. 366
represents the shape of the printer 300 and is always lit, 36
7 represents the photoreceptor 301 and is always lit; 368 represents the top shape of the printer 300 and is always lit except when the conveyance section is jammed; 369 is the one that alternates when the conveyance section is jammed (when 374 flashes). Light. Reference numeral 370 indicates five segments that display the conveyance state of the paper, and one segment moves from the right side to the left side while lighting up.

FIG. 8 is a schematic block diagram of the data control section 2 in FIG. 1. The data control unit 2 converts the character code information and image information sent from the host system 1 into a dot-compatible page memory 20 that corresponds to the print area on the paper of the printer 300 and then stores the data. Further, the stored data on the page memory 20 is sent to the printer 300 to perform a printing operation.

The data control unit 2 is configured to receive (pull) two types of information. One is character code information (JIs
In this case, the character generator 15 generates a character pattern corresponding to the character code, and the dot information of the character pattern is stored in the page memory 20. The other is image information, and in this case, it is already input in the form of dot information, so it is stored in the page memory 20 as is. Hereinafter, an overview of the data control section 2 will be explained with reference to FIG.

Information from the host system 1 is sent to the interface 50 via the signal line S01, and the information is further stored in the data latch 3.

Communication MFi between the interface 50 and the host system 1
lSO2 is sent from the host system 1. The data strobe signal and other control signal line SO3 are
Busy signal and status signal lines from the data control device.

The format of the information sent from the host system 1 is shown in FIGS. 9 and 10. The format example in Figure 9 is for character code information, where a character identification code indicating that it is character code information and a paper size code indicating the size of the paper to be printed are placed at the beginning of one page. There is.

Thereafter, character code data is entered in the order of the first line, second line, . Further, character code data for one line consists of a code indicating the character size, a character code, and a 1F code indicating the division of one line of data.

FIG. 10 shows a format for image information, in which an image identification code indicating image information and a paper size identification code indicating the size of paper to be printed are entered at the beginning of one page of data. After that, 1 line.

2 lines... Image data is contained in the order of m lines. Furthermore, since the data for one line is specified by the paper size identification data, it is automatically determined by counting the specified data on the data control unit 2 side. There is.

The input information from the distributor 4 is processed as follows. The information that has entered the distributor 4 is always input from the distributor 4 to the decoder 5 via the output line S04. First, regarding the case of character code information, when the character identification code shown in FIG. The main control unit 6 determines that the input information is character code information, and instructs the distributor 4 to input the next paper size data to the page code buffer 1 control circuit 7 via the signal line SO6. . Therefore, the paper size data is input from the distributor 4 to the page code buffer 7 control circuit via the data line SO7. The next 1st line, 2nd line......n
The data up to the row is input from the distributor 4 to the page code buffer via the data line SO8. At this time, the character code data is stored in the memory area on the page code buffer 9 designated by the address counter 8. When the input of character code information for one page into the page code buffer is completed and the END code shown in FIG. 9 is detected by the decoder 5, the main control unit 6. EN to each page code buffer control circuit 7.
Inform D code detection. When the page buffer control circuit 7 confirms that input of character codes for one page into the page code buffer is completed by indicating J: on the signal line S09,
Data is stored in the page memory 20 in units of dots.

FIG. 11 shows the correspondence between memory spaces on the page memory 20 and sheets. In FIG. 11, broken lines indicate the outside of each sheet. In other words, 25 is the leading edge of the paper (common to all sizes), 2
4 is the left side of the paper (common to all sizes), 28 is the right edge of A5 size paper, 27 is the right edge of A4 size paper, 26 is the right edge of A3 size paper, 31 is the rear edge of A5 size paper, 30 is A4 size paper The trailing edge 29 indicates the trailing edge of A3 size paper. 32 is the address ADR (0) of the read address counter 19 and the write address counter 18.
, O) points. Here, ADR (0, O) indicates that both the vertical address (ADRV) and the horizontal address (ADRH) are r O+. In other words, the write address counter 18 and the read address counter 19, as shown in FIG.
>, and ADRV is the vertical address (
11, and ADRH represents a horizontal address (arrow C in FIG. 11).

43 is the last horizontal address of A3 size paper (A3HE
), 44 is the horizontal address of A4 size paper (A4HE)
, 4.5 is the horizontal address of A5 size paper (A58E)
It is. Similarly, 46 is the last vertical address of A3 size paper (A3VE), 47 is the vertical address of A4 size (A4VE), and 48 is the vertical address of A5 size paper (A3VE).
5VE). 33 is the vertical address ADRv-0.33 of A3+l size. Horizontal 7 dress ADRH=A3HE(i'
1 point ADR (0, A3HE), 34 is similarly ADR (0, A4HE), 35 is ADR (0, A51-
IE) are not shown. 36 is A3 size vertical address ADRV= (A3VE), horizontal address A
DRH-O point ADR (A3vE.

○), 37 is ADR (A4.VE, O) in the same way.

38 indicates ADR (A5VE, O), respectively.

39 is A3 size vertical address ADRV=A3VF,
Point △DR(A
3VE, △3HE), similarly 40 is ADR (△4
VE, A4HE), 41 is ADR(A5VE, A5H
E) are shown respectively.

Storing a character pattern as a dot image in the page memory 20 having the above-mentioned memory space is performed as follows. The character size data of the first line is transferred from the page code buffer 9 to the page code buffer 7 via the signal line S10.
It is read by the control circuit 7. The font types in this embodiment are basically two types of fonts: 40 x 40° and 32 x 32 dots.The page]-de buffer 7 control circuit 7 determines the font size based on the read character size code, and uses the determination signal. is sent to the page memory control circuit 17 via the signal line S11 and to the character generator 15 via the signal line S13. Page memory control circuit 17
Then, the line feed pitch and character pitch are controlled by the character generator 1 based on the character size determination signal.
In step 5, character size areas are switched.

Character codes after the character size data are stored in a line address counter 11 in a line buffer 10 with memory capacity for one line.
will be transferred to the specified area.

When the transfer of one line of character code data to the line buffer 10 is completed, the line address counter 11 returns to the initial address (
Return to 0). First, the first vertical line of the character font (line 57 in FIG. 11) is written into the page memory 20.

Here, the line/scan counter 13 has an initial value (0,
O), and the write address counter 18
The value of is ADR(0,0). row buffer 10
The character code data is sequentially read out at a constant cycle starting from the first digit, and is latched into the output latch 12 in order to synchronize with the line counter 13. When the first character code (the character 'T' in this embodiment) is latched into the output latch 12, the character code and the output of the line/scan counter 13 are combined in the synthesis circuit 14, and the character pattern selection code of the character generator 15 is generated. is input to the character generator 15 as follows. Here, the configuration of the line/scan counter 13 will be explained.
The upper 6 bits are a counter that counts scanning lines, that is, a counter in the vertical direction of the character pattern.
For 40X/110 dot characters, 0 to 39 plus,
The line feed pitch control line counter returns to 0'.

The lower 3 bits serve as a counter in the horizontal direction of the character pattern, and in the case of a 40 x 40 dot font, it counts from 0 to 4 plus the character pitch control and returns to 0. <The output of the character generator 15 is 8 bit parallel ).

Below, the font size is 40X40. The operation in the case where the horizontal distance between characters is 8 bits and the vertical distance between one character is 8 bits will be described. As mentioned above, the first character code ('
T') is set in the output latch 12, the character code and the output of the line/scan counter 13 are combined in the synthesis circuit 14, and the character generator 15 outputs the code as a character pattern selection code for the character generator 15.
is input. At this time, since the value of the line/scan counter is (0, O), the character generator 15 outputs the data (8 bits) of the character pattern on the 01th line in the vertical direction and the 01st line in the horizontal direction. ) is output. The output data of the character generator 15 is once latched by the output latch 16 in order to synchronize writing to the page memory 20, and written to the address on the page memory 20 specified by the write address counter 18 by the page memory control circuit 17. It will be done. In this case, since the writing address counter 18 is ADR (0, O), it is written to the vertical address ``0'' and the horizontal address ``O''.Then, the 1-byte character pattern When writing is completed, the value of the line/scan counter becomes (0
, 1), and the value of the write address counter 18 also changes to ADR (0, 1). Therefore, the character generator 15 outputs the data of the character pattern in the vertical direction 'O' line and the horizontal direction '1', which is latched by the output latch 16 in the same way as described above, and is then latched by the ADR (0 , 1) written to the address. In this way, the top t of the vertical ``0'' line of one character pattern is
! When writing of data ('4th' data) is completed, the value of the line/scan counter becomes (0, 5) and the value of the write address counter 18 becomes ADR<0.5>. Since the horizontal spacing between characters is 8 dots 1 - (1 byte), the output of the character generator 15 is forced to all O' by the command from the page code buffer control circuit 7, and the output of the character generator 15 is forced to O', ADR(0,5)
O' is written to the address, and after the write operation is completed, the row address counter is incremented by '1' and the next character code is transferred from the row buffer 10 to the output latch 12. Further, the line/scan counter becomes (0, O), and the write address counter 18 becomes ADR (0, 6). Therefore, next, the data of the 0'th line in the vertical direction of the 0' character pattern is written to the page memory 20. At this time, the write address counter 18 is set to ADR<0.6>, (0,7
>, (0, 8>, (0°9>, (0, A)), etc., and write the character pattern data of each O to the address specified by the write address counter 18.
Go with υ.

Then, the value of the write address counter 18 is (0°B),
When the value of the line/scan counter 13 becomes (0°5), O' is written to the page memory 20 in the same way as described above, and after the write operation is completed, the row address counter becomes plus 1.
', and the next character code is set in the output latch 12 from the line buffer 10.

Further, the line/scan counter 13 becomes (0°O), and the write address counter 18 becomes ADR (0°C).

In this way, the character pattern data of the ``0'' line in the vertical direction is sequentially written into the page memory 20.
Then, when the 'LF' code is output to the output of the row buffer 10, the 'LF' code detection signal is sent to the output line S1.
4 to the page code buffer 1 control circuit 7, and the writing operation of the character pattern from the character generator 15 is stopped. After that, the write address counter 18 is sequentially incremented by ``1'' and ``O'' is forcibly written to the page memory 20. If specified, the value of ADR (0, A3HE), that is, Fig. 11 3
When it reaches 3 points, after the forced "O" write operation, the write address counter 18 becomes ADR<1. O), row address counter 11.18(0), and line/scan counter 13 are set to (1, O), respectively. and,
'T', which is the first character code from the line buffer 10, is set in the output latch 12 again. Then, the character pattern data of the ``1'' vertical line of the character pattern is written into the page memory 20. Similarly, the vertical direction of the character pattern is '2°.

3'...Pa The writing operation up to the 39th line is completed.
Then, the write address counter 18 becomes ADR(28, O
>, the row address counter 11 is (O).

The line/scan counters 131t (28, 0> are respectively set. This completes the writing operation of character pattern data for one line. Next, the line feed bit is set every 48 lines, so the remaining 8 lines are forced. ``O'' is written to the page memory 20. Then, ``O'' for 8 lines is written to the page memory 20.
’ is completed, the address counter 18 for
The address value of is point '?' in FIG. 11, 61. 1, the row address counter 11 is (0) when ADR<30.0H.
).

The line/scan counters are each set to initial values (0, 0). This completes all write operations including the line feed pitch for one line. and row buffer 10
Then, the next second line of character code data is transferred from the page code buffer 9. When the transfer of character code data is completed, the row address counter 11 returns to the initial address (0). Thereafter, character pattern data on the second line is written in the same manner as writing the character pattern data on the first line. Therefore, when all writing operations for the character pattern data on the second line are completed, the address value of the write address counter is ADR (60, O), and the row address counter 11 is (
0) and the line/skip 1 counter are set to (0, O), respectively. In this way, the character codes of each line are sequentially patterned and the pattern data is written onto the page memory 20. Then, when an ``END'' code indicating the last line is detected from the line buffer 1, the data writing operation of the character pattern is stopped. Then, the page code buffer control circuit 7 forcibly sets the output of the character generator 15 to 0' via the signal line 813, and notifies the page memory control circuit 17 that writing of character pattern data has ended.

After receiving the write end signal, the page memory control circuit 17 selects the final memory address (39 point ADR (A3VE) in FIG. , △3
Forcibly write 101 to HE)). Then, 0' is written at point 39 in FIG. 11, and the entire operation of writing character pattern data for one page of the designated paper size into the page memory 20 is completed. The old address counter 18 is ΔDR'(0,0), and the row address counter 1 is ΔDR'(0,0).
1 is (O), line/scan counter 13 is (0, O
) are all initialized.

Next, a case where the data sent from the post system 1 is image information will be described. When the image identification code shown in FIG. 10 is input to the decoder 5, the output of the decoder 5 is input to the main control section 6 via the signal line SO5. Main control section 6
Then, it is determined that the input information is image information, and the signal line 306 instructs the distributor 4 to input the next paper size data to the page memory control circuit 17.

Therefore, the paper size data is sent from the distributor 4 to the data line 307.
The data is input to the page memory control circuit 17 via the page memory control circuit 17. Next image data 1, 2. ...The image data up to m is sent from the distributor 4 to the page memory 20 via the data line S15.
is input. The method of inputting image data to the page memory 20 is performed as follows. When the page memory control circuit receives the paper size identification code, it stores the next image data at 32 points (address ADR(o, o)) in FIG.
The write address counter 18 is set to ADR (
0, O). Then, the data length for one line in the horizontal direction is determined from the paper size identification code by referring to a table in the page memory control circuit 17. Therefore, if the paper size of the image information input to the page memory 20 is A4, the data length of one line is a value up to 44 points (A4HE) in FIG. 11, that is, A4HE'. Naturally, the length of the image information per line sent from the host system 1 is 'A4H'.
E', so image data 19 image data 2 in FIG. ...The data length of the image data m is 'A4VE'
', and the number m of image data is the value of 47 points in FIG. 11, that is, 'A4VE'. Therefore, the image data 1 in FIG. 10 is stored in the page memory 20 as shown in FIG.
(0°A48E), image data 2 is a 51 point line, image data 3 is a 52 point line...
Image data m is a line of 37 points, so the final address is 40 points ADR (A4VE, A'1.HE). Image information is written into the page memory 2o while controlling the write address counter 18 in this manner.

The character pattern data 13 written in the page memory 2o in this manner is sequentially output to the latch 21. Goo 1-Circuit 23. Data for printing is sent to the print control section through the interface 22 and the Inter 7/8 bus S17. In FIG. 8, S17 is a status data line from the print control unit, 818 is a command data line for specifying the operation mode, etc. to the print control unit, and S19 and 820 are strobe signal return lines when sending command data and print data. , S21 is a busy signal line from the print control section, S22 is a horizontal synchronization signal line from the print control section, S23 is a page end signal line that also indicates the end of print data, and S24
is a ready signal line of the print control section, S25 is a print request signal line that notifies the printable state, and S26 is a select signal line (2 lines) that specifies the data content of the data line in the interface bus S17.

S27 is a print start signal line that instructs the print control section to start a print operation.

To explain in more detail when data is sent to the print control section, printing from the data control section 2 is started using the start signal line 827.
In response, the print control section sends a horizontal synchronization signal S22.

With this horizontal synchronizing signal 822, each data of the 32 point line in FIG. S2
2, the address is sequentially changed line by line according to the page end signal 323 from the print control unit.
This operation is repeated until the page end signal S23 is received, and the data in the designated area of the page memory 20 is sent to the print control unit.When the page end signal S23 is received, the data sending is forcibly stopped. In the print control section, the page end signal S23 is not output at the same timing as the horizontal synchronization signal 822. In addition, in correspondence with the memory addresses in Figure 11, the last line A3 of the memory area of the paper size has 46 points, and that of A4 has 46 points.
It is output from the print control unit at the same timing as 7 points or earlier.

Further, in the page memory control circuit 17, the page memory 20
When the sending of print data starts, the values of the read address counter 19 and the write address counter 18 are always compared, and if the value of the read address counter 19 is larger, the sending of that data is stopped. The write operation is controlled to allow the write operation to the completed memory area. Therefore, the loss of writing time to the page memory 20 is greatly reduced.

FIG. 13 shows a block diagram of the print control section 100 in FIG. 1. In FIG. 13, 101 is the print control section 100.
A microprocessor 102 for controlling each unit in the microprocessor 101 is an interrupt control circuit for controlling interrupts to the microprocessor 101, and a command signal line 830 . Page end signal line S29 from print data write control circuit 19.
Interrupt request signals from each of the timeout signal lines 828 from the general-purpose timer 103 are sent to the microprocessor 1.
Tell 01. A general-purpose timer 103 generates basic timing signals for controlling paper conveyance, drum rotation processes, and the like. In this embodiment, this general-purpose timer 103 has five
It is set to m5ec. A ROM (read only memory) 104 contains all control programs for operating the print control section 100. 10
5 is the same ROM and contains a data table different from the ROM 104. The contents of the data table are
5 (shown in A>. In Figure 45, Δ), the address (
4000, 4001) contains top margin control data for paper size A3, and address (4002, 40o3).
) is bottom margin control data, address <400
4. /+005> contains data for left margin control, and addresses (4006, 4007) contain data for right margin control. Similarly, the address (
4008 to 40oF) contain data for controlling the top, bottom, left, and right margins for paper chair B4f7). Margin control data corresponding to various paper sizes is included up to address (/1087) below. These margin control data are used as set data for a margin control counter in a print data write control circuit 119, which will be described later. Here, the term 1 to ``bottom margin'' refers to the information recording start position that crosses the beam scanning direction (that is, in the paper conveyance direction), and the bottom margin refers to the length up to the recording end position in the paper conveyance direction. The right margin refers to the period from the start of scanning in the beam scanning direction to the start of recording, and the left margin refers to the period from the start of scanning in the beam scanning direction to the end of recording.

The addresses (4100 to 41FF>) contain a table of command codes for specifying operations from the data control unit 2, and are used for checking the cape code from the data control unit 2.The contents of the command are 1 ~Tubu/bottom margin change table.

Top margin adjustment table, cassette top/bottom adjustment T-
7/l/, cassette/manual feed adjustment table, etc.

Addresses <4200 to 4.2 F F ) contain data on the charging characteristics of the photosensitive drum 301;
Contains data for 5 scales. This data is used for temperature correction control of the charging charger 3.4, which will be described later. Addresses (4300 to 43FF) are the exchange data table, and photosensitive drum 3o1. It contains replacement cycle data for the developer in the developing device 307 and the fixing roller 332.

The addresses (4400 to 47FF>) are a control timer table that contains various timer values for performing printing operations, such as each process timing and paper feed timing.

106 is a RAM (random access memory), which is a working memory, and includes a timer (TIM) A as shown in FIG.

Contains a paper size register B, . . . , E1 (stores cassette size data based on signals from cassette size detection switches 320 and 32/4, which will be described later), status register 6, and other contents. The microprocessor 101 compares the cassette size stored in the paper size register with the size of recorded information (image data, etc.) from an external device sent from the data control unit 2, and determines the cassette size. If the size is larger, print control unit 1 in the later stage
The printing operation command is not issued to ゜O. Therefore,
Even if the printing paper size is larger than the information υ size sent from the outside, it can be printed, improving the usability. 10
Reference numeral 7 is a non-volatile RAM, and the data in the memory is retained even when the power is cut off. In addition, the non-volatile generation RAM
The data contents within are shown in FIG. 45(B). Figure 45 (B
), the address (6000) contains the drum characteristic number input from the operation unit in the exchange mode, and the address (6100) contains the jam information when a jam occurs, and when the jam occurs, the power is turned off once. This is used to prevent forgetting to dispose of jammed paper inside the machine when the machine is turned off. Address (6200) is a paper discharge tray counter that counts the sheets in the reversing tray 381, and is incremented by 1 each time one sheet of paper is sent to the reversing tray 381. When this count value reaches a predetermined value, the tray becomes full and a message is displayed on the operation unit to prompt the operator to take out the paper from the tray. Further, the main paper discharge tray counter is automatically cleared when paper is removed from the tray by the operator. Therefore, even if the power is turned off, the number of sheets remaining in the tray is maintained by the book counter.

Address <6300) is a drum exchange counter, which counts up by 1 for each print. When the value of this counter reaches the value of the replacement table (drum) shown in FIG. 45 (Δ), the operator is informed by the display on the operating section that the drum should be replaced.

Address (6400) is a developer exchange counter, which is counted up by 1 for each print as in the case of drum exchange, and the value of this counter reaches the value of the exchange table (developer) in FIG. 45 (,A). Displayed on the operation panel when

Address (6500) is a fixing roller exchange counter, which is counted up by 1 for each printing as in the case of drum exchange, and when it reaches the value in the exchange table (fixing roller) in Figure 45 (A), the operation unit is indicate.

108 is a power supply sequence circuit, and the non-volatile generation RA
It has the function of preventing erroneous operation when turning on or turning off the power of M107. 399 is a power supply @ position that supplies power to the control unit. Reference numeral 110 is for the input/output capo 1, which outputs display data to the operation display section 111 and reads data for each operation switch. Reference numeral 112 denotes an input port for reading input data from each detector 113 in the print control section 100. Reference numeral 116 indicates driving elements such as a motor, a high-voltage power lamp, a solenoid, a fan, and a heater. 115 is a drive circuit for the drive element 116, and 114 is an output J port that provides an output signal to the drive circuit 115. 31
2 is a laser skin motor for operating the laser beam, 118 is a drive circuit thereof, and 117 is an input/output port for supplying a drive control signal to the drive circuit.

344 is a semiconductor laser, 120 is a laser modulation circuit that performs optical modulation of the semiconductor laser, and 346 is a beam detector that detects the light beam operated by the laser scan motor, and a PIN diode that responds at high speed is used. There is.

121 is a high-speed comparator for digitizing the analog signal from the beam detector and creating a horizontal synchronizing pulse; 119 is for converting the print data of the video image transferred from the data control unit 2 to a predetermined position on the photoreceptor 301; This is a print data write control circuit that controls writing to the copy and generates test pattern print data. 122 is an interface circuit that controls output of status data to the data control section 2, reception of command data and print data from the data control section 2, and the like.

The details of the main blocks in FIG. 13 will be explained below. Figure 14 shows the various detectors 1 shown in Figure 13.
13 is a detailed circuit diagram. In FIG. 14, im signals from various detectors are input to a multiplexer 139. The multiplexer selects 8 by the select signal S31.
The input port 1 in FIG.
12 is input.

Reference numeral 320 denotes an upper cassette size detection switch, which is composed of four switches, and the combination of these switches indicates the paper size. Reference numeral 324 denotes a lower cassette size detection switch, which has the same configuration as the upper cassette size detection switch. Reference numeral 319 is a cassette upper paper out switch, which is turned on when the cassette runs out of paper. 323 is a lower paperless switch. 123 is a pass sensor in front of the registration roller, and a CDS light receiving element is used. This sensor is
A bias voltage is applied through a resistor (not shown), and the output voltage changes depending on the presence or absence of paper. Therefore, by inputting the output to the comparator 124 to which the reference voltage Vref1 is applied, a signal for determining the presence or absence of paper can be obtained.

Reference numeral 326 indicates a manual feed switch for detecting paper from the manual feed guide 325, 336 indicates a paper ejection switch located on the fixing roller section, and 395 indicates a paper ejection switch required on the paper ejection tray section. Reference numeral 125 indicates a toner out detection switch for detecting the absence of toner in the drain box, and 126 indicates a toner full detection switch which operates when the toner pack is full of toner.

Reference numeral 127 is a sensor for detecting the toner specific depth of the developer (probe temperature detection sensor), in which a diode is used. A bias voltage is applied to this sensor via a resistor, and the output voltage changes depending on the toner concentration. Therefore, by inputting the output to the comparator 128, since the reference voltage ref2 is applied to the other input terminal of the comparator 128, a signal of 1 or O is obtained when the toner moisture level is above or below the specified value, respectively. It will be done.

129 is 0N10FF by opening and closing the front cover.
130 is the temperature fuse provided in the fixing device, 131 is the driving power supply (+24VB)
This is an MC relay that turns 0N10FF. One of the temperature fuses 130 is connected to the +24 V A power supply, and if the temperature fuse 130 is blown due to an abnormality in the fixing device, the MC relay 131 is turned off and the driving power is turned off. Further, the temperature fuse 130 is connected to the resistor RO1, and one of the resistors ROI is connected to the resistor R
It is connected to O2 and the input of comparator 132. Further, the other input of the comparator 132 has a reference voltage Vref.
3 is applied. Therefore, when the temperature fuse 130 blows, the input of the comparator 132 becomes Ov. Therefore, the comparator 132 outputs a temperature fuse blowout detection signal. 133 is a destination selection switch, and specifically, it is turned ON by 0N10FF of this switch.
The condition is for domestic use (A and B size), and the OFF status is for US use (legal, letter size). Therefore, for example, even if the combination of codes by the upper or lower cassette size switches (four pieces) are the same, either the domestic or US paper size is selected depending on the state of this switch.

134 is a jam reset switch, which is installed inside the front cover. This switch is a switch that is turned on for confirmation after the operator has disposed of the paper jam or replaced the toner bag when a paper jam or toner full operator call occurs. Therefore, unless this switch is turned ON after the above processing, the display on the operation panel indicating that the printer is full of gym or toner will not be cleared. 392 is a paper discharge tray sensor that detects paper within the 1-ray in FIG. 33
A thermistor 4 detects the temperature of the fixing device, and is controlled so that the temperature detected by this thermistor is constant. The output of thermistor 334 is connected to resistor RO3 and comparator 136.13.
It is connected to the input side of 7. Therefore, the input voltage of the comparator changes as the resistance value of the thermistor 334 changes due to temperature.

That is, as the temperature increases, the input voltage increases.

The other input terminal of the comparator 136 has a resistor RO6
A voltage divided by RO7 is applied, and the output of the comparator 136 changes depending on whether it is higher or lower than the divided reference voltage. Also, resistors RO6 and R
A resistor RO8 is connected to the connection point of O7, and one end of the resistor RO8 is connected to the collector of the transistor 138. Therefore, when this transistor 138 is turned on by the input signal (power save signal) 33, =1 the amplifier 13
The reference voltage of 6 is lowered by the resistor RO8, and the temperature control of the fixing device is lower than when the transistor 138 is OFF. Therefore, the power consumption of the fixing device becomes low and the fixing device enters a power save state. Also, comparator 137
The reference voltage is given by the voltage division of resistors RO4 and RO5. Since the reference voltage of the comparator 137 is set much lower than the reference voltage of the comparator 136, it is possible to detect a temperature drop in the fixing unit due to a heater disconnection or a failure in the drive circuit of the printer 9 during printer operation. be able to. and output 8 of comparator 136
33 is input on one side to multiplexer 139 and is read by microprocessor-101. Note that this input signal is used to detect the ready state of the fixing device. The other signal is used as a drive signal for the fixing device heater lamp 333 in FIG.

342 is a drum temperature sensor that detects the temperature near the photoreceptor 301. The output side of thermistor 342 is connected to resistor R58 and the input of operational amplifier 270. Therefore, the resistance value of the thermistor 342 also changes depending on the temperature change near the photoreceptor 301. Therefore, operational amplifier 2
The input voltage of 70 also changes. The operational amplifier 270 outputs a low voltage when the 'tA degree of the photoreceptor 301 is low, and a high voltage when the temperature is high. The operational amplifier 270 serves as a voltage follower, and its output is connected to the input of the A/D converter 271.

Then, the output voltage of the operational amplifier 270 is converted into a digital value by the A/D converter 271 and read by the microprocessor 101 through the multiplexer 139. This A/D-converted temperature data of the photoreceptor 301 is used for charge correction of the photoreceptor 301 that is to be arrived at later. 440 is a cassette upper/lower adjustment switch;
1 is a cassette/manual feed adjustment switch, and 442 is a top margin adjustment switch. These various adjustment switches are installed inside the device and are operated by a service person by opening the machine. Each of these switches has a plurality of setting sections.

That is, the cassette operator/lower cassette adjustment switch 440 adjusts the lower cassette 1 with respect to the center position of the upper cassette.
The cassette/manual feed adjustment switch 441 also has a plurality of setting sections corresponding to the positional deviation of the manual feed guide based on the 1st current position, and has a top margin adjustment. switch 442
has a plurality of setting sections for adjusting the positional deviation of the recording start position. These setting signals select corresponding data in the ROM. In particular, the minimum amount of change (1 bit) in the top margin adjustment switch is determined by the number of pulses that is an integral multiple of the output pulses obtained from the scanning beam detection means. These switches are set by a service engineer who executes a test mode to be described later and determines the print status when a test print is performed.

FIG. 15 is a detailed block diagram of the drive circuit 115 and output element 116 in FIG. 13. In FIG. 15, 141 is a developer motor, and a DC-driven Hall motor is used. Reference numeral 140 denotes a driver for the developer motor, which performs PLL control. 143 is a fixing device motor, and a DC-driven Hall motor is used.

142 is a driver for the fuser motor 143;
Performs PLL control. 145 is a fan motor for cooling the inside of the machine, and a DC-driven Hall motor is used. 144 is a driver for the cooling fan motor, and a PL like the developer and fixing device driver in (previous) E is used.
L speed control is not performed, 147 is photosensitive drum 3
01 drive motor, which uses a 4-phase pulse motor. 146 is a driver for the drum motor 147, which employs a constant current 1-2 phase excitation method. Note that the speed is 1200F) and the drive is performed at a portion where vibrations of about 1200PS are less likely to occur. 149 is a registration motor that drives the registration roller 329 and manual feed roller 327, and is a pulse motor. 148 is a driver for the registration motor, which uses a constant voltage two-phase excitation system. The speed is about 400PPS.

Note that when the registration motor 149 rotates in the normal direction, the registration roller 329 rotates, and when the rotation direction is reversed, the manual feed roller 327 rotates. These are transmitted via a one-way clutch.

A paper feed motor 151 is a pulse motor that drives the lower paper feed roller 322 and the lower paper feed roller 318.

As above, pressure and reverse rotation are transmitted via a one-way clutch. Reference numeral 150 denotes a driver for the paper feed motor 151, which uses constant voltage two-phase excitation similarly to the registration motor driver 148. The speed is about 400PPS.

Reference numeral 302 denotes a static elimination lamp that removes residual charges on the photoreceptor 301 before charging, and is composed of a plurality of red IQLEDs. R10 is a current control resistor for the static elimination lamp 302, and 152 is a driver for the static elimination lamp 302. 303 is a pre-transfer static elimination lamp placed before the transfer charge V to increase transfer efficiency, and includes a plurality of red LEDs.
It consists of R11 is a current control resistor for the pre-transfer static elimination lamp, and 153 is a driver for the pre-transfer static elimination lamp. 158 is a solenoid for the toner collection blade, and when this solenoid is turned on, the photoconductor 301
The blade 310 is pressed against. 154 is a driver for the blade solenoid 158. 159 is a 1-toner replenishment motor for replenishing toner from the toner hopper to the developing device 307; when this toner replenishing motor rotates, the toner is supplied from the toner hopper to the developing device 307;
Replenish the water with 1~ner. The operation of the toner supply motor 159 is performed according to the output of the prologue concentration detection sensor shown in FIG. 14. Reference numeral 155 is a driver for the 1-ner supply motor 159. 131 is an MC relay that works in conjunction with the door switch similar to that shown in Fig. 1/1 above;
156 is its driver. 15, the common on the power supply side of the motor, lamp, etc. shown in FIG. When 131 is ON,
The structure is such that the motor and lamp can be operated.

304 is a charger for charging, and the case of the charger is connected to the ground of the aircraft body.

The charger's discharge wire is connected to the high voltage power supply 33.
8 is connected to the output terminal of the charging high voltage power supply 160, and the high voltage output 0N10FF is connected to the input of the charging high voltage power supply 160.
The signal line S35 is connected to an analog control signal line S36 that changes the high voltage output current. Further, the analog control signal line S36 is connected to the D/Δ converter 165, and the D/A converter 165 is
converts it into an analog voltage and controls the output current of the charging high-voltage power supply. 306 is a peeling charger, and a peeling charger +7306 is connected to the output of the high voltage power source 161 for tearing. The high-voltage power source for peeling has an AC output. Reference numeral 305 is a transfer charger for transferring the developed toner on the photoreceptor 301 onto paper, and the transfer charger is connected to the output of the high-voltage power source 62 for transfer. In addition to the transfer charger output, the transfer high-voltage power source also incorporates a developer bias power source, and its output wire 838 is connected to the developer magnet roller 308. This voltage applies a bias voltage to the magnet roller 308 to provide a developing bias. 33 is a heater lamp of the fixing device, one side of which is connected to one side of the ACl 00V power source.

The other end is connected to the second contact 164 of the M'C relay 131, and the other end is connected to the heater drive circuit 166. Therefore, the heater lamp 333 operates only when the MC relay 131 is ON. Two input signals S33 and 839 are input to the heater drive circuit 166, and S33 is a signal from the thermistor 334 in the fixing unit shown in FIG. 14, which is a density control signal for the fixing unit. S30 is a forced OFF signal for the heater lamp 333 from the microprocessor--101.

Figure 16 shows the laser skitten motor 3 in Figure 13.
12 and its driving circuit 118. FIG. 16th
In the figure, 312 is a circuit diagram inside the laser scan motor. LO2, LO3; LO4 indicates a motor coil, and 180, 181, and 182 are Hall elements that detect the position of the motor rotor, respectively. 183,1
84, 185 are the Hall elements 180, 181, 182
The output is connected to the bases of power transistors 171, 172', 173 for driving the motor coils LO2, LO3, LO4 in the drive circuit 118 through resistors R26, R27, R28. Further, the power transistors 171, 172, 1
Between the base and emitter of 73, there is a base resistor R23.
, R24, and R25 are connected to each other. As the rotor of the motor rotates, the Hall elements 180, 181 and 182 are turned on in the order of 180, 181 and 182. Therefore, the outputs of comparators 183, 184, and 185 are also 18
The level becomes LOW in the order of 3, 184, and 185. Therefore, the power transistor is 0 in the order of 173°172.171.
By applying the drive voltage in the order of LO2, LO3 and LO4, the laser scan motor 312 rotates. Also, the output of the comparator 185 is connected to the diode D.
The signal is input to the frequency division counter 175 through O2, through a waveform shaping circuit including a resistor R30, a capacitor CO6, and an inverter 174. The outputs of the output terminals 01 and Q2 of the frequency division counter 175 are the motor speed switching game 1-1.
76.177, and the output of the speed switching gate is connected through an OR gate 178 to the FG large input of a PLL (phase, lock, loop) control IC. In addition, the speed switching gate 176.177
The output of the speed control signal line S40 and its inverted output are connected to one input of the speed control signal line S40. Therefore 340 is 1-O
In the case of the W level, the switching gate 177 is enabled, and the output of the frequency dividing counter Ql is inputted to the FG of the PLI-control l0167, and when 840 is l-I T G l- level, the switching gate 1-176 is activated. becomes effective, and the Q2 output of the frequency division counter 175 becomes the FG of the PLL control IC 167.
A large input is input. Here P L L IIJ tHI
To briefly explain the input/output signals of IC167, P
/S terminal (PLAY/5TOP) stops at HIGH level and starts at LOW level.

In the case of HIGH level, the common power of both terminals of AGC and APC becomes HIGH l-level. FGIN is a rotary motor pulse signal input from the motor to be controlled, N1. N
2 is a signal that switches the frequency division number of the reference frequency divider inside this IC, 3
3/45 is the motor rotation speed switching signal, CPOUT is the crystal reference frequency division output signal, CPIN is the reference frequency input, LD
is a lock detection signal, which outputs a HIGH level when the motor rotation speed is within the lock range, and a LOW level otherwise. AFC is PLLI with motor speed control system output.
8-bit D/A converter output inside C, APC is motor phase control system output and 8-bit D/A inside PLLIC
This is the converter output. Further, XOl connected to P L l-1C167 is a crystal resonator for generating a reference frequency, and COl and GO2 are capacitors for oscillation.

The AFC and APC output terminals of the PLL control IC 167 constitute an adder circuit with resistors R12 and R13, and an operational amplifier 16.
It is connected to one side input terminal of 8. operational amplifier 168
+12V is connected to the + side input terminal of the resistor R14 and R15.
A voltage divided by is applied. Further, a negative feedback circuit is formed by the resistor R16 and the capacitor CO3, and in particular, the capacitor C03 serves as a bypass filter. Therefore, the amplification degree of the operational amplifier 168 is such that it has a characteristic of attenuating inputs having a certain frequency or higher. operational amplifier 1
The output of 68 is connected to the 10 input terminal of a pulse width modulation type switching regulator IC169. 169 is a commercially available pulse width modulation switching regulator I
It is C. This IC 169 and power transistor 170.
Diode DO1, DI/L/101. Co>Den vC
05 constitutes a down switching regulator circuit. In the input/output of the IC169, one terminal is a comparison reference voltage terminal, and the base iI! inside the IC169. - A reference voltage obtained by dividing the voltage of the voltage output terminal VREF by resistors R17 and R18 is applied. The DEADT 1ME terminal regulates the maximum pulse width of the output, and a voltage obtained by dividing the VREF by resistors R19 and R20 is applied thereto. C1 and C2 are output terminals, and the pulse width changes depending on the voltage value of the input terminals. That is, when the + side input terminal voltage is lower than the one side input terminal voltage, the pulse width of C1 and C2 on the LOW level side becomes small, and the width when the power transistor 170 turns ON becomes small as well.

Therefore, the voltage across the capacitor 005 also becomes smaller.

Moreover, when the + side input terminal voltage is higher than the one side input terminal voltage, contrary to the above, the pulse widths of CI and C2 become large, and the voltage across the capacitor CO5 also becomes large.

The rotation speed control of the scan motor 312 will be explained below.

Rotation start signal S/12 of scan motor 312 is Low
IC167 AF for level, PLL control till
Since both outputs of C and APC are at the IOW level until the aforementioned lock signal 8S41 is output, the output of the operational amplifier 168 is a voltage of 1-11G + - level. Therefore, the output pulse width of regulator IC169 is large, and the voltage across capacitor CO5 is approximately +16V.
It will be about. Since any one of the Hall elements 180, 181, 182 is turned on at the position where the Tanabata rotor is stopped, the motor coils 102, 1.
．． 03, l Among the Hall elements 180, 181 of 04
．． The coil corresponding to 182 is excited and the skin motor 312 starts rotating. The scan motor 312 then speeds up its rotation. The level of the speed control signal line 34.0 is now l-11Gl(, so the Q2 output of the frequency division counter 175 is the F of the PLL control IC 167.
It is added to the G input terminal. Therefore, the frequency division counter 175 functions as an 8 frequency division circuit. When the double frequency applied to FGIN reaches approximately 96% of the % quasi-frequency inside P1-LIC169, the lock signal LD S41 is activated.
G ) -l becomes AFC, APC output Lz Hellha L
OW L/H/L, (OV') not fixed, P
Switched to the output voltage of the ILIC internal D/A converter. Therefore, from now on, the scan motor 312 is controlled to a constant speed by the speed control system output AFC and the phase control system output APC.

In addition, in this embodiment, if a print command is not received from the data control unit 2 for a certain period of time (approximately 5 minutes), the Togi scan motor will be in a standby state and the output of the speed control line S40 will be L.
Become OW level. Therefore, the frequency divider 175 divides the frequency from the previous frequency by 8 to 4, so the scan motor has a rotation speed of 4/8, that is, 1/2. This is to perform half-speed control as described above in order to prevent problems with reliability of the motor's bearings, etc., from occurring if the motor rotates at high speed for a long period of time. In this embodiment, during printing operation, that is, during high-speed rotation, approximately 12. OOOrpm, approximately 600 during standby
Orpm.

FIG. 17 is a detailed circuit diagram of the laser modulation circuit 120 and semiconductor laser 344 in FIG. 13.

In FIG. 17, 344 is a semiconductor laser diode, which is composed of a laser diode main body 259 that emits light, and a monitoring photodiode 260 that is a light detection means that monitors the intensity of the output beam from the laser diode 259. Reference numeral 257 is a high frequency transistor which is a voltage-current conversion means (or first current driving means) and performs optical modulation of the laser diode 259. Resistance R
50 is a current detection resistor, 258 is a laser diode 2
59 is a transistor which is a second current driving means for flowing a bias current, R51 is its current limiting resistor, R5
2 is a base current limiting resistor of the transistor 258.

254, 255, and 256 are high-speed analog switches for modulating the laser diode 259, and each analog switch switches between the drain (D) and source (S) when a HIGH level voltage is applied to the gate (G). becomes low resistance and turns ON! When an OW level voltage is applied to the gate (G), the resistance becomes high and 01
: Goes to F state. The output power from the laser If-259 has three levels in this laser printer.
, the first is a portion corresponding to the white background on the paper, and the photoreceptor 30.
The output P for almost completely removing the charged charge of 1
By turning on the analog switch 254 at (ON>), the laser diode 25 outputs the output P('ON
).

The second part corresponds to the black background on the paper, and is located on the photoreceptor 301.
In order to leave the charges on the top as they are,
By turning on the analog switch 256 in the state, that is, the output P (OFF>), the laser diode 25
9 is the output OFF, that is, P(OFF); 3rd is the print density of one dot line at the output P(S)-1) between the first output P(ON) and the second output P(OFF>) Turn on the analog switch 255.
? As a result, the laser diode 259 becomes the output P(S H) (details of P(Sl-1 will be explained later)).

Resistors R42 and R43 are analog switches 254°255
．． Short circuit protection resistance when changing 0N10FF of 256, 249
, 250, 251 are the analog switches 254. ．． 2
55,256 gate drivers. CO9, C1
0, C11 is a speed-up capacitor, R47
, R48, R49 are the gate drivers 24.9, 2
The input resistance is 50,251.

246 is a 3NAND gate, and when all three gate inputs become HIGH level, the output becomes LOW level, turning on the analog switch 254, and the laser diode 259 becomes in the output P (ON) state. 3
The first of the two input gates is connected to the output of the inverter 253, and the impark 2530 input is connected to the print data signal 547 (print at +-11GH level, do not print at IOW level). The second is connected to the output of the inverter 252, and the input of the inverter 252 is connected to the shadow signal S4.8 (shadow on at H[Gl-Level, off at LOW). The third is connected to the laser enable signal 549 (HIG l-level for laser enable, l-, OW for laser forced OFF). Therefore, the conditions for the output of the NAND gate 246 to be at the IOW level are that the laser enable signal S/1.9 is HlG H and the shadow signal S/1.9 is HlG H.
8 is l-OW, print data signal 34.7 or 1. ,,O
It's W Nodoki. Next, 247 is a 3 N A N D gate, and when all three gate inputs are at HIGH level, the output becomes IOW level, turning on the analog switch 255, and the laser diode 259 turns on the output P(S). -1> state. The first of the three input gates is connected to the shadow signal 348, the second to the output of the inverter 253 which is the inverted signal of the print data signal S47, and the third to the laser enable signal 8$49. There is. Therefore, the NAND goo h
The conditions for the output of 247 to be at the 1-0W level are that the laser enable signal S49 is HIGH and the shadow signal 848
is l-11GI-1, and the print data signal 847 is LOW. Next, 248 is a 2OR gate, and when one of the two gate inputs becomes LOW level, the output becomes LOW level, turns on the analog switch 256, and turns on the laser diode 259.
becomes OF' F state output P, (OF > state.

245 is a sample and hold IC, which converts the output of the laser diode 259 into the shadow output P(SH
) is used to control

ANALOG-INPUT is the analog voltage input to sample, SAMPl, EC is the hold capacitor CO8
The connection terminal 5TROBE is a sampling strobe signal terminal, and is connected to the sample strobe signal S46. 237 is a 1:ET large input operational amplifier, which constitutes the Porchi 97407 circuit. DO3 is a Zener diode that regulates the output of laser diode 259 to be within the maximum rating. In addition, the resistor R40 and capacitor CO7 constitute an integrating circuit, and the resistor R4
1 is a discharging resistor that discharges the charge of the capacitor CO7 at a constant rate. 236 is an analog switch whose gate (G) is connected to the buffer 244, and the sample signal S45 is input to the input of the buffer 2/I4. 253 is a transistor for level conversion, R39
acts as a current limiting resistance when charging the capacitor CO7. R38 is a base current limiting resistor of the transistor 235, and 234 is a comparator serving as comparison means. This comparator has a hysteresis characteristic due to the action of resistors R34 and R35.

The output voltage of the laser monitor amplifier 232 is applied to the input side of the comparator 23/I through the resistor R34. 232 is an amplifier for detecting the optical output from the laser diode 259 and outputs from 7711 to the diode 260, and serves as current-voltage conversion means. Resistors R32°R33 and VRO1 are resistors that regulate the amplification degree of the operational amplifier 232. Therefore, by changing the polycomb VRO1, the amplification degree of the operational amplifier 232 can be changed. R31 is an output load resistance of the photodiode 260 in the semiconductor laser 344, and a voltage proportional to the output current of the photodiode 260 is obtained. The relationship between the short circuit current (S) and the optical output PO of the photodiode 260 is shown in FIG. 19. In FIG. 19, is represents the monitor current, and Po represents the optical output of the laser diode 259. 6111W, P (S l-1> output is approximately 4 mw, -P (OFF) is O. Also, LA-
A and 'LA-B represent two types of laser diode monitor characteristics. Normally, the volume VRO1 is adjusted so that the output voltage of the operational amplifier 232 is about 3V when the laser diode optical output is 6 mW. Therefore, both the characteristics of the graphs LA- and 1A-B in FIG. 19 can be adjusted by the polycomb VRO1.

238 is a comparator for checking whether the laser diode 259 is emitting light, and the output voltage of the operational amplifier 232 is applied to the + side input. Also-
A voltage divided by resistors R36 and R37 (set to about 2.0V in this case) is applied to the side.

Therefore, the laser diode 259 emits light, and its output of about 2 mW changes from a LOW level to a HIGH level, and a laser ready signal S43 is output. Further, a laser light amount setting voltage is applied to one input terminal of the comparator 234. The set voltage is given from either analog switch 240 or 241. That is, the analog switch 240 is turned ON when the laser output P(ON> is set), and the output voltage of the voltage follower 239 is applied to one side input of the comparator 234.The input terminal of the voltage follower 239 is connected to the first The voltage is inputted after being divided by the main exposure adjustment 1 ream 360, which is a voltage variable means, and the resistor R45, and by varying the main exposure adjustment polycomb 360, the voltage at one side terminal of the comparator 234 also changes. The analog switch 241 is turned on when the laser output P (S)l) is set, and the output voltage of the voltage follower 239 is controlled by the resistor R46 and the shadow exposure adjustment volume 361 which is the second voltage variable means.
A voltage divided by is applied to one input terminal of the comparator 234. Voltage follower 2 above
39, analog switches 240, 241, main exposure adjustment volume 360. Resistor R45, shadow exposure adjustment volume 361. The resistor R46 constitutes a light output setting means. Further, a circuit that compares the voltage detected by the monitor photodiode 260 and amplified by the monitor amplifier 324 with a set voltage by the comparator 234, and integrates the comparison value is called an optical output stabilizing means.

The analog switches 240 and 241 are switched by the main exposure setting signal 84.4. That is, when the main exposure setting signal $44 is at a LOW level, the output level of the inverter 242 becomes a HIGH level, and the analog switch 241 is turned on. Also,
When the main exposure setting signal 344 is )l T G l- level, the output of the buffer 243 becomes l-11GH level and the analog switch 240 is turned on. Also,
The outputs (S side) of the analog switches 240 and 241 are also input to a voltage follower 261, and the output S50 of the voltage follower 261 is used to correct the threshold level of a horizontal synchronous pulse detection comparator of a beam detection circuit, which will be described later. Ru.

Next, the current-output characteristics of the laser diode used in this printer will be explained. Figure 18 is I
It is a graph of F-Po characteristics. TC-0℃ is the IF-Po characteristic when the case humidity of laser diode 344 is 0℃,
Same < TC=25℃, when case temperature is 25℃, TC=5
0°C is the IF-Po characteristic when the case temperature is 50°C. Taking the characteristics of case temperature TC=25° C. as an example, when the current IF flowing through the laser diode 259 is increased sequentially from O, the optical output po starts to be output from the point of about 5CH++A. Then, at the point where I F = 68 mA, the optical output of P(ON) becomes 5 mw.

Therefore, even when TC=O°C, the optical output po starts to be output at a point of about 40 mA, so by turning on the transistor 258, the bias current IFB is always turned on when the laser enable signal S49 is at a HIGH level. The power loss of the laser modulation 1-transistor 257 is reduced. Therefore, the operation of the laser modulation transistor 257 is guaranteed to be extremely stable even at high temperatures due to the action of the bias current IFB. In addition, if the amount of change in current required to modulate the laser is, for example, TC = 25°C, the current of <lF25 can be directly changed by the value C of lF25 - TFB.
- The accuracy of the optical stabilization operation, which will be described later, can be considerably improved compared to driving with the transistor 257. Furthermore, as is clear from the graph, the output of the laser diode itself varies considerably depending on the temperature, so the light amount stabilizing circuit is required. This laser light amount stabilizing circuit detects the amount of light from the laser diode 259 using a monitor diode 260 and controls the short circuit current Is of the photodiode 260 to always be a constant amount. This is because, as is clear from Fig. 19, the monitor short-circuit current is and the laser diode 2
Since the optical output po of 59 is in a perfect proportional relationship, if the monitor current 1 s is kept constant, the optical output PO is always kept constant. Further, since the temperature-related drift of the photodiode 260 is very small, even if the temperature changes, the amount of change in the previous output can be ignored. Next, one operation of the above-mentioned optical output stabilizing circuit will be explained using FIG. 17 and FIG. 20.

In FIG. 20, when the laser enable signal 849 and the sample signal S45 both reach the level 11GH, the transistor 258 in FIG. 17 is turned on, and the resistor R51 turns on.
A bias current (approximately 30 mA) flows through the laser diode 259 through the laser diode 259.

Also, at this time, both the print data signal 347 and the shadow signal S48 are at the LOW level, so among the gates 246, 247, and 248, only the inputs of the gate 246 are all at the HIGH level, so the output is at the LOW level and the analog Of the switches 254, 255, and 256, the analog switch 254 is turned on. Further, the analog switch 236 is turned ON when the sample signal @S45 becomes 1''IGH. At this time, since the capacitor CO7 is not yet charged, the output of the operational amplifier 237 is o■, and the base of the laser modulation transistor 2570 is also OV. Therefore, at this point, only the bias current flows through the laser diode 249, and the laser diode does not emit light, as can be seen from the characteristics shown in FIG. Since the laser diode monitor photodiode 260 does not emit laser light, the monitor current Is is O.
Since the output of the operational amplifier 232 is OV, the output of the comparator 234 becomes LOW level, and the transistor 235 is turned off.

Since the transistor 235 is OFF, the capacitor CO
7 is charged through resistors R39 and R40. The time constants of the resistors R39 and R40 and the capacitor CO7 during charging are selected to be about 20 to 50 msec. If this value is very small, the response of the stabilizing circuit will be too fast, and the fluctuations in the optical output level of the laser will become large. Also, if there are too many people, the response will deteriorate and it will take time for the light output to stabilize. As the capacitor 007 is charged, the output voltage of the voltage follower 237 also gradually increases. Therefore the laser modulated river transistor 2
As the base voltage of 57 increases, current flows through the collector. At this time, the collector current 1c of transistor 257 has a current value of (VB-VBE(SA))/R50. A summation current IF of the bias current IFB from the transistor 258 and the current Ic from the transistor 257 flows through the 25 laser diodes. Then, the current fc increases, and the current fc of the laser diode 259 increases.
When the word current IF reaches approximately 50 mA (TC=25°C), the radar diode 259 emits light. When the laser diode 259 emits light, the monitor current of the monitor photodiode 260 flows in accordance with the emitted light output, so that the voltage at the ten input terminals of the operational amplifier 232 increases, and the output voltage is also a value obtained by amplifying the input voltage. Output. The amplification degree of the operational amplifier 232 is adjusted in advance by the volume VRO1 so that the output voltage of the operational amplifier 232 is approximately 0.5V for the output 1mW of the laser diode 259, so the optical output of the laser diode 259 increases to approximately 2 +11W. , when the output voltage of the operational amplifier 232 reaches approximately 1V, the output signal of the comparator 238, that is, the laser ready signal S4
3 changes from 1-OW to HIG1 level. Since the main exposure setting signal @S44 is at the LOW level at one side input terminal of the comparator 234, the analog switch 241
through shadow exposure level (light output P(SH)>ff
i pressure is applied. This voltage is set according to the sensitivity characteristics of the photoreceptor 301, and the shadow exposure level voltage is set by a shadow exposure setting volume 361 in the operation unit. Now, a voltage of 2.0 nm corresponds to an average value of optical output of 4 nnv. Suppose that it is OV. Therefore laser diode 2
The optical output of 59 increases by 112, and the voltage at the input terminal of comparator 234 increases by 2. When the voltage exceeds OV, the transistor 235 is turned on and the capacitor CO7 is discharged through the resistor R40. Therefore, the base voltage of laser modulation transistor 1 to transistor 257 also decreases, and laser diode 2
The optical output of 59 is less than 4mW. When the optical output of the laser diode 259 becomes 4mW or less, the comparator 23
The + side input terminal voltage of No. 4 also becomes 2.0 V or less, and the transistor 235 is turned off again.

Then, the capacitor CO7 is charged up again through the resistors R39 and R40. When this happens, the laser diode 259 again changes its optical output around 4 mW, causing the comparator 234 to repeat the 0N10FF operation at a constant cycle. Note that this] comparator 234 has a hysteresis characteristic, so comparison judgment becomes stable.
Be able to make reliable judgments. And the resistor R3
Due to the integral effect of 9 and R40, Conde Reza 00F0
The voltage at both ends approaches the value of VOl in FIG. 20 and becomes stable. After the laser ready signal 843 becomes HIGl-level, the microprocessor 101 outputs a shadow level sample strobe signal S46 after a predetermined time t6 has passed through the output port. When the sample strobe signal is output, the sample hold IC24'5
samples and holds the voltage VO1 (FIG. 20) of the capacitor CO7 input to the ANALOG-INPUT input terminal, and stores the voltage in the hold capacitor CO8. Therefore, the sample strobe signal is OFF.
After that, the control voltage VO1 for outputting the shadow level P(St-()) continues to be output to the output OUT of the sample-and-hold IC.

Next, when the sample and hold operation of the shadow level P(SH) is completed, the microprocessor 101 switches the main exposure setting signal S44 to HIG I-level through the output port. Therefore, the output voltage of the voltage converter 07239 is applied to one input terminal of the comparator 234 through the analog switch 240. The output of the voltage follower 239 has the main exposure level (light output P (
ON)) voltage is being output. This voltage is applied to the photoreceptor 30
Assume that the voltage is set by the main exposure setting volume 360 in the operation unit according to the sensitivity characteristics of 1, and that a voltage of 3.0■ corresponding to an average light output of 6 mw is currently being output. . Therefore, the output of the comparator 234 has one side input terminal as 3. L due to switching to OV
The signal becomes OW level and the transistor 235 is turned off. Therefore, the capacitor CO7 is further increased in charge, thereby increasing the base voltage of the laser modulation transistor and increasing the optical output of the laser diode 259. And the optical output of the laser diode 259 is 6
mw (when it approaches d, the output voltage V2 of the operational amplifier 232
32 becomes approximately 3V. The output voltage of the operational amplifier 232 is 3
When the voltage exceeds V, the output of the comparator 234 changes to HI G +-1, the transistor 235 turns on, and the capacitor CO7 is discharged through the resistor R40, as in the case of setting the shadow level described above. Therefore, the base voltage of the laser modulation transistor 257 also decreases, and the optical output of the laser diode 259 becomes 6 mW or less. When the optical output of the laser diode 259 becomes 6mW or less,
The voltage at the + side input terminal of the comparator 234 also becomes 3.0V or less, and the transistor 235 is turned off again. Then, the capacitor CO7 is charged up again through the resistors R39 and R40, and the optical output of the laser diode 259 becomes 6 mW or more.

In this way, the comparator 234 repeats the 0N10FF operation at a constant cycle when the optical output of the laser diode 259 is around 6 mW. And the resistors R39 and R40
Due to the integral effect of
It becomes stable as it approaches figure VO2. When the setting of the main exposure level is completed, the microprocessor 101
The operation of a sampling timer, which will be described later, is started to write print data onto the photoreceptor 301. The sample timer is triggered one after another at a constant period T each time a laser beam detection signal, which will be described later, arrives, and the sample timer is triggered one after another at a constant period T, and only in the section other than the writing operation of the print data, that is, the section 1 in FIG. 20a.
A non-pull signal S45 is output. Since the sample signal S45 is at the LOW level in the section of the print data 847 and the shadow data S48, the analog switch 236 is turned off. Therefore, the laser diode 25 is activated by the print data D47 and the shadow signal S48.
9 is a laser diode 25 in the modulated printing area.
As mentioned above, the optical output level of No. 9 is P (ON), P
There are three levels: (SH) and P (OFF>. In other words, the first is when the print data signal S47 is OFF, that is, L
When the shadow signal is OFF or LOW level at OW level (white output for printing), N, AN
The D gate 246 is established and only the analog switch 254 is turned on, the main exposure level voltage VO2 is applied to the base of the modulation transistor 257, and the optical output of the laser diode 259 becomes LLP (ON) =6n+w. Second, when the print data signal S47 is OFF and the shadow signal is ON (the printing output is a halftone), the NAND gate 247 is established, only the analog switch 255 is turned ON, and the modulation transistor 25
The output voltage VO1 of the sample and hold IC 245 is applied to the base of the laser diode 7, and the optical output of the laser diode 259 becomes P(SH) -4 mw. The third case is when the print data signal S47 is ON and the shadow signal is OFF (the print output is black), and the OR gate 248 is established and only the analog switch 256 is turned ON. Therefore, the base of the modulation transistor 257 is shot to GND and becomes Ov, so the optical output of the laser diode 259 becomes P(OFF)-0 and does not emit light. In this manner, the first printing is performed. When printing is completed, the microprocessor 101 sets the main exposure setting signal 844 to LOW level again through the output port, and resets the shadow exposure level P(SH). Therefore, the voltage at one side input terminal of the comparator 234 becomes 2.Ov, which is the set voltage of the shadow exposure level. Therefore, the transistor 235 is turned on, and the capacitor CO7 is discharged and the VCO7 becomes smaller. To explain the optical output stabilization operation of the laser diode, it is assumed that the case temperature of the laser diode 344 increases by Δ]' during the second printing operation. As is clear from the characteristic diagram in Figure 18, when the case temperature rises, the IF-Po characteristic curve of the laser diode shifts to the right, and when the same current is passed through the laser diode 259, the optical output Po decreases. Resulting in. Therefore, in order to obtain the same optical output, IF must be increased by the amount of current ΔIF corresponding to the shift of the characteristic curve to the right. Therefore, the voltage VCO7 of the capacitor CO7 is the first set voltage VO.
VO higher than 1 by the voltage Δv1 corresponding to the ΔIF.
3, and the optical output of the laser diode 259 is set to P(SH)=4 mw, which is the same as the first setting. Then, like the first time, the shadow exposure level P (ON) is set in the sample hold IC 245 by the sample strobe signal 846. At this time as well, the operation corresponds to the increase in humidity in the case of the laser diode 344, and the voltage of the capacitor CO7 is set to VO4, which is higher by the correction voltage Δ■2 due to the temperature increase, and the second printing is performed after the setting. In this way, the shadow exposure level P (SH) and the main exposure level P (ON
> is maintained at a constant level very accurately by the function of a stabilizing circuit, thereby making it possible to perform high quality printing. As mentioned above, the main exposure level P (ON> is set to perform a light amount stabilization operation to keep the light output constant at all times except when writing print data.Also, the shadow exposure level is set for each print. Before starting printing, a sample hold operation is performed, and the light amount stabilization operation during the print filling operation is not performed like the main exposure level.This is because the circuit becomes complicated and expensive, and the main exposure level This is because the shadow level is auxiliary compared to level fluctuations, and even if it fluctuates a little, it does not have much of an effect on print quality.The settings to be input to the comparator 234 according to the sensitivity characteristics of the photoreceptor 201 When varying the voltage, adjust it by varying the main exposure setting volume 360.

This main exposure setting volume 360 (well, it is designed to vary the input voltage of the voltage follower 2'39. Therefore, by varying this main exposure setting volume 360, the light output setting voltage at P (ON) can be adjusted. On the other hand, the optical output setting voltage at P(31-1) is determined by connecting the output voltage of the voltage follower 239 to the resistor R46.
The pressure is divided by the dough exposure setting volume 361. Therefore, by adjusting the main exposure setting calibrator 360, when P (ON), P (St-1)
The optical output setting voltage changes proportionally at the time, and a constant relationship between the recording density and the applied voltage can be maintained. Therefore, the adjustment becomes simple without requiring the complicated operation of varying and adjusting the set voltages for both P(ON> and P(SH) times as in the prior art).

FIG. 21 is a detailed circuit diagram of the beam detection circuit 121 and beam detector 346 in FIG. 13.

In FIG. 21, 346 is a beam detector that uses a PIN diode with very fast response. Further, this beam detector 346 is connected to the photoreceptor 301 as shown in FIG.
This serves as a reference pulse when writing print data to the printer, and its pulse width and pulse generation position must be very accurate.

Therefore, if the pulse width, pulse generation position, etc. vary with each beam scan caused by the rotation of the polygon mirror 313, the writing start point on the photoreceptor 301 will vary, resulting in poor print quality. The 7th node and negative side of the beam detector 346 are connected through a load resistor R52 and resistors R5 and 5 to one side input terminal of a high speed comparator 262 which is a comparing means. Further, a voltage divided by resistors R53 and R54 is applied to the + side input terminal of the comparator 262 through a resistor R56. Further, a capacitor C12 for noise removal is connected in parallel to the resistor R54. Further, R57 is a positive feedback resistor for providing hysteresis characteristics, and C13 is a feedback capacitor for applying high-speed feedback to improve the output waveform. Further, a variable threshold voltage 850 is applied to the + side input of the comparator 262 through a diode D40° and a resistor R57. This threshold variable voltage 850 is the output of the analog switch 240 or 241 (output of the optical output setting means) (see FIG. 17). FIG. 22 shows the relationship between the one terminal input waveform of the comparator 262, that is, the output waveform of the beam detector 346, the positive terminal voltage of the comparator 262, and the output waveform of the comparator 262 at that time. When the laser beam passes over the beam detector 346 at high speed, a pulse current flows from the beam detector (PIN diode)] The waveforms a and b in FIG. 22 are input to one input terminal of the comparator 262. Now + of comparator 262
The voltage of the side input terminal is the threshold variable voltage S50
Assuming that a low voltage VO6 is always applied because VO6 is not applied, the output waveform of the comparator 262 will be the output waveform shown by the dotted line in the case of waveform a, and the output waveform shown in the solid line in the case of waveform A. Become. Here, waveform a indicates a waveform when the sensitivity of the photoreceptor 301 is low and the laser output during the main exposure is 6 mW or more, and conversely, a waveform when the sensitivity of the photoreceptor is high and the laser output is 6 mW or less. As can be seen from this output waveform, when the positive voltage of the comparator 262 is kept constant, the output waveform changes significantly depending on the amount of light incident on the beam detector 346. Therefore, by using the variable threshold voltage 850 to correct the voltage of VO5 when the light intensity of the laser beam is large and the voltage of VO6 when the intensity of laser beam is small, the output waveform is kept almost constant as shown in Figure 22. It is possible to maintain the

FIG. 23<A), (B,) are the beam detectors CP I
346 is a configuration diagram of an N diode) 346. Figure 23 (A
), (B), 410 is a light receiving element, 411 is an electrode wire, 412 is a mask plate, 413 is a laser scanning beam, 4
Reference numeral 14 indicates a light receiving element mounting base, and reference numeral 415 indicates an output lead wire. The PIN diode used in this example has a photodetector shape of 2, 5 x 2, 5 mm, and a response time of 4 QSeC.

The laser beam 413 is scanned at a constant speed in the direction of the arrow in FIG. 23(A) by the rotation of the polygon mirror 313. When the laser beam 413 passes over the light-receiving element 410, an output current flows according to the first output j of the laser beam 413. At this time, the input waveform of the one side input terminal of the comparator 262 in FIG.
The waveform will be as shown in the figure. In FIG. 24, input waveform 1 is a waveform when there is no mask on the light receiving element 410, and noise is generated before and after the output waveform. This is mainly intended for cases where the light receiving element 410 itself is used for detecting light that is originally stationary or for detecting light that has a very slow speed even when it is being scanned, and the parallelism of the end surface of the light receiving element 410 is There are quite a lot of bad elements, and when the laser beam passes through their end faces, the output current becomes unstable. Therefore, in order to solve these problems, the light receiving element 410
By attaching a mask 412 that prevents the laser beam 413 from passing on the light receiving surface of the laser beam, cracking of the output waveform when the beam passes on the end surface is prevented. The mask 41
2 is a light receiving element 41 as shown in FIGS. 23(A) and 23(B).
The laser beam 41 has a structure in which a square window is opened in the end face portion of the laser beam 411 and the portion that does not include the electrode wire 411 lead-out portion.
3, the light hits the light receiving element 410 only when it passes through the four corner windows. With such a structure, the accuracy, particularly the parallelism, of the window portion of the mask is increased, so that the input waveform to the comparator 262 can be a waveform that does not contain noise, as shown in input waveform 2 in FIG. 24.

FIG. 25 is a detailed circuit diagram of the print data write control circuit 119 shown in FIG.
The parallel print data S57 is serially converted to be written in a predetermined area on the photoreceptor 301 in accordance with the rise of the paper to be printed, and sent to the laser modulation circuit 120. Further, a shadow signal for improving the print quality is generated from the data contents of the print data S57 and sent to the laser modulation circuit 120 together with the print data. Further, the laser modulation circuit 120 sends out signals necessary for setting the optical output. Further, a timing signal for controlling the output from the print data control section 2 is sent to the interface circuit 122. The other is to generate test printing patterns necessary for maintenance.

In FIG. 25, reference numeral 186 denotes an input/output port for transmitting and receiving signals necessary for control within the laser modulation circuit 120 and the print data writing control circuit 119, and 187.
A counter/timer 188 controls the writing position of print data, test pattern generation, laser light output sampling, and the like. 189 is a crystal oscillator that serves as a reference clock for image clock pulses and has an oscillation frequency of approximately 32M.
It is HZ. 190 is a circuit that generates an image clock, which generates a pulse (approximately 8 MHz) corresponding to the minimum modulation unit of a laser beam (1 dot); 191 is a byte unit (8 bit) printing unit received from an interface circuit; Control counter for serial conversion of data, 19
2 is a circuit that generates a test pattern used during maintenance (when this circuit is selected, a test print is performed and the various adjustment switches mentioned above are adjusted); 211
is the dest pattern data and interface circuit 122
Multiplexer for selecting which print data to print from, 21
0 is a shift for converting the 8-bit parallel data from the multiplexer 211 into serial]~register, 213
, 214 is a line memory for temporarily storing print data and has a memory capacity of 4096 bits, 212 is an address counter for the line memories 213 and 214, and 215 is a decoder for producing a signal for controlling the test pattern generation circuit. Reference numerals 226, 227, and 228 are flip-flops for synchronizing the sending timing of print data and screen data.

Here, the details of the counters 187 and 188 will be explained. 275 is a counter that determines the timing for laser light intensity correction for each line (horizontal scanning line), and counts based on the reference clock signal S53, and generates a sample signal S75 used for light correction and line start. , 276 is a counter for determining the horizontal recording start position, and the horizontal recording start position (left margin) is determined based on the Q7 output (video first dot unit signal) S83 from the control counter 191.
Outputs 84. A counter 277 determines the recording end position in the horizontal direction, and performs a count based on the bidet eighth dot unit signal 883, and outputs a data write end position (write margin) signal S85. 27ε3 is a counter for vertical recording start positioning, and is input/output port 1.
Counting is performed based on the output of a gate 198 which combines the sheet leading edge position (page top) signal 374 outputted from 86 and the Q output of flip-flop 204, and a page top count output 876 is generated.

Numeral 279 is a vertical recording end positioning counter which counts based on the output of gate 198 and outputs page end count signal 877 as described above. 280
is a counter for vertical direction test pattern control, which performs the counter 1 based on the Q output of the flip-flop 240 and outputs the dest pattern control signal 879.

FIG. 26 shows the interface circuit 12 in FIG.
2 is a detailed circuit diagram of No. 2. In FIG. 26, 263 is an input/output port that receives command data and print start command signals from the data control unit 2, and sends data data to the data control unit 2 and ready status signals of the print control unit. , 264 is an 8-bit latch for both command and print data.

265 is a transceiver/receiver for the interface data bus 359. Reference numeral 266 indicates a decoder for the data selection signal S60 that specifies data on the data bus 859, and 269 indicates a control circuit for the BUSY signal that controls the data sending timing to the data control unit 2 when command data and print data are received. Li.

Next, details of the interface signal will be explained. In FIG. 26, S59 is a bidirectional 8-bit data bus, and 860 is a data selection signal FID on data bus S59.
The data on the data bus 859 is selected by the combination of COM and IDSTA (7) 2fg. 861 is IP
A signal indicating that the print control unit 100 is in a ready state at RDY.

362 is JPREQ, and No. 13 permits the sending of the print start signal IPRNT from the data control unit 2, and S63 is j.
When the data control section 2 receives this signal, it stops sending out the print data.

864 is IH8YN, a request signal to send one line of print data, S65 is IPRNT, a print start command signal, 8
30 is a command and print data strobe signal, abbreviated as 15TB, and 866 is IBSY, a signal for permitting sending of the strobe signal S30 and for reading status data on the data control unit 2 side.

Commands and print data are sent to transceiver/receiver 26
The status identification signal 868 is output to the output line S72 of
It is output when it is FF. The data on output line S72 is transferred to data latch 264 by strobe signal S30.
latched to. In the case of command data, it is latched to the input/output port 263, and after identifying the command, the specified operation of the command is executed. In the case of print data, it is sent to the print data write control circuit from the output line S59. Also, the status data is sent as follows. By receiving a status request command on the print control unit 100 side, the status contents corresponding to the command are set in the status data output 871 of the input/output boat 263. The set status data S71 is input to the transceiver/receiver 265. The entered data is a status identification signal 868
When it is ON, it is output on the data bus S59.

Details of commands and statuses used in the print control section 100 are shown in FIGS. 27 and 28, respectively.

In FIG. 27, SR1-SR6 are status request commands corresponding to status list 6 in FIG.

PSON is a power save command that reduces the power consumption of the fixing device 331, and PSOF is a command to cancel the power save state.When not recording, the power save command PSON reduces the power consumption of the fixing device 331 to save power, and when recording Sometimes the power save cancellation command r
-) SOF allows the power to be increased to normal values to overcome toner fusing. CS T U is a stack feed group designation command for - of the cassette, C3TL is also a lower stage designation command, VSYNC is a command to instruct the start of sending print data from the data control unit 2, M "1 to 9 are manual feed mode designation commands, 78M1 to 78M4 indicate top/bottom margin designation commands to designate the printing start position on the paper, and SOF designates a command to forcibly turn off shadow exposure.

In Fig. 28, during paper conveyance, the status indicates that paper is being fed and the paper is being conveyed into the printer, and the select switch ON is the select switch 354 of the operation unit.
The status indicates that the VSYNC request has been pressed, the status indicates that the print control unit 100 has received the printer 1~ start command, and it is now possible to receive print data, and the manual feed mode indicates that the paper feed mode is manual feed. The upper/lower cassette status indicates the status of the selected cassette in the cassette feeding mode.
The top/bottom margin indicates the status of the top/bottom margin selected by the top/bottom margin commands (78M1 to 78M4), and the cassette size (upper row) and current size (lower row) indicate the size of the installed cassette. The status indicates the size code, Test/Maintenance indicates the test/maintenance state, Data resend request indicates the need to reprint due to a jam, etc. During the wait, the printer The status indicates that the device is in the Δ-up state, and during power saving, the power save command (PSON) indicates that the device is in power save mode. The operator call indicates that a status 4 A-berator call factor has occurred. Serviceman call indicates that a serviceman call factor of status 5 has occurred. Tray full indicates that there are more than the specified number of sheets in the paper ejection tray and the tray is full. Toner bag replacement indicates that the toner pack is full of toner. Paper jam indicates that paper has jammed inside the machine. No Toner indicates that there is no more toner in the toner hopper. A cover oven indicates that the front door is not closed. A timing error indicates that there was a problem in transferring print data. A fixing device failure indicates that there is an abnormality in the fixing device, such as a heater disconnection or a temperature fuse out. A laser failure indicates that the laser diode does not reach its specified power or that the beam detector is unable to detect the beam. A scan motor failure indicates that the scan motor does not reach the specified rotation speed even after a certain period of time has passed at startup, or that the rotation speed deviates from the specified rotation speed for some reason after reaching the specified rotation speed1.
゜Heat roller replacement indicates that the fixing roller counter in FIG. 15 has reached a specified value and the fixing roller needs to be replaced. Similarly, drum replacement is performed when the drum replacement counter reaches a specified value and the drum needs to be replaced, and developer replacement is similarly performed when the carrier replacement counter reaches a specified value and developer replacement is required. show.

FIG. 29 shows the positional relationship between one scanning range of the laser beam including the beam scanning section 349 on the photoreceptor 301 in FIG. 3, and the beam detection position and data writing position that fall within the scanning range. FIG. In FIG. 29, 416 is the beam scanning start point, 417 is the beam scanning end point, and the beam that has reached the beam scanning end point 417 is moved by the next surface of the polygon mirror 313 from the beam scanning starting point 416 at time O. Begin scanning the beam. 418 indicates a beam detection starting point of the beam detector 346, 428 indicates the left end surface of the photosensitive drum, and 429 similarly indicates the right end surface. 419 represents the left end surface of a sheet of paper size A3, and 420 similarly represents the right end surface. 421 is the left end surface of the paper size A3, 420 is the right end surface, J-0421 is the data writing start point of the same A 3 + J size paper, 422
similarly indicates the end point of data writing.

423 (left end side of the paper size 86, 424 is the right end side, 425 is the data writing start point of the same size, 42
Similarly, 6 represents the end point of data writing. Also 4
27 represents the center point of the paper.

d4 is the distance from the beam scanning 418 to the writing start point of △3 size, ('5 is the distance to the writing start point of 6g size, and d6 is the distance to the writing end point 426 of the same <A6'J size. , d7 represent the distance to the writing end point of A3 size paper. d8 represents the distance from the beam detection point 418 to the right edge surface 420 of A3 size paper. d3 represents the range of one scan of the beam. d 14., d 9.
d10 indicates the effective printing range at 3 and 80, respectively. As is clear from this drawing, the paper feed of this printer is always centered around the paper center point 427, so the starting point for printing from the beam detector position 418 differs depending on the paper size, and therefore the paper is fed at the paper center point 427. It is necessary to write data after a lapse of time corresponding to the distance from the beam detector 346 detecting the beam to each writing start point. Instead of performing such control, this printer does not employ a paper edge feeding mechanism, so it is possible to print on the entire surface of the paper. In this example, the left and right margins on the left and right sides of the paper are set to 3 mm, but this is set to 0.
It is possible to do so. Furthermore, conventional printers that perform edge-feed conveyance usually require a margin of about 8 to 10 milliliters, which has the disadvantage that a considerably large portion of the paper is not printed.

FIG. 30 shows the paper size and print area portion of FIG. 29 not only in the horizontal direction but also over the entire surface of the paper. In FIG. 30, 436 represents 6 sheets, and 437 represents Δ3 sheets. 419,420°421, 422. 423
．． 424. 425. Regarding 426.4.27, the same position as in FIG. 29 is shown. 430 is the leading edge of the paper, 1
132 represents the data writing start point in the vertical direction of the paper, 431 represents the rear edge of A3 size paper, 433 represents the data writing end point of A3 size paper, 434 represents the rear edge of H6 size paper,
435 represents the end point of writing 6 size data.

Next, the operation of the above-mentioned component device will be explained with reference also to timetables v-1- in FIGS. 31 and 32.

Ready signal IPRDYO of print control unit 100 (S61)
becomes ready for printing.

At the same time, the print start signal IPREQO (S62) becomes active. Next, the laser enable signal LDON1
(S49) rises to 1. This signal S49 causes the first
The transistor 258 shown in FIG. 7 is turned on. At this time, the data knobs 226 to 228 of the data knob 70 in FIG. 25 are not set, so the print data signal 847 and the output signal 848 are both 0'. Since the laser enable 349 is "1", the print data is Ql, and the seed signal 348 is O', the gate 246 in FIG.
is established and the analog switch 254 is turned on, causing the laser diode 259 to emit light. Then, the monitor photodiode 260 operates, the A operational amplifier 239 operates via the operational amplifier 232, and the laser ready signal LRDY1 (S43) is generated. Next, in synchronization with the horizontal synchronizing signal H3YO, (S54), the counter 2
A sample signal SMPTO (S75) is generated from 75. This signal 375 is used to set the time corresponding to the distance d3 (distance of one line) between the pulls 416 and 417 in FIG. 29 that defines the paper size. The light amount is corrected at each time, and it is used as a line start signal.In other words, this signal S7
5 opens the gate 193 in FIG.
4, a sample signal S45 is generated and this sample signal S45 turns on the analog switch 236 via the gate 244 in FIG. Light amount correction is performed. PTC 0 (876) is an output signal of a counter (page top counter) that determines the leading edge of the paper, and PECTO (877) is an output signal of a counter (page top counter) that determines the end position of the paper. When the time comes to write the image,
Sends the status of the VSYNC request to the external device.

Due to the stiffness, a VSYNC command is issued, and when it is received, PTOP (873) is issued and 1-ISYN is issued from that point.
Start counting the number of lines in C. In the same way, specify how many lines to write from that position (end position). A 1-top margin nT and a holatom margin n'' are provided to allow this specified value to be changed.If the above-mentioned specification is made, the PTOP signal will be generated before the leading edge of the paper when VSYNC is received. For example, if a 5 mm margin is required, count the number of lines including that margin.

If the top margin is 1 Qmm, data corresponding to that amount will be set in the timer.

The position of the bottom can be determined in the same way. Once the data is set in the timer, the gate is opened and the count is started, and when the count is finished, it starts up. Gate 201 in FIG. 25 determines where to write in this way. LSTO (378) is the output of flip-flop 204 for synchronization and is set by H8YNC and reset when the sample timer signal rises. This reset line is included in the LDON signal (849) in FIG. 25, and the reset line does not normally work, but is forcibly reset. The Q output of the flip-flop 204 is generated by the resonator 1, and the clock generation circuit 190 operates to count the clocks from the oscillator 189.

This clock generation circuit 190 divides the frequency of the clocks from 18 oscillators by 4 and outputs a pit-based signal only while the line start signal LST is set. This output becomes two types of signals S82 and 887 with different phases. As a result, synchronization for -lines is achieved. V
D A T 1 is the print data signal (S47), P/
The S conversion shift register 210 operates to output the data as serial data. That is, the P/S conversion shift register 210 receives the signal S82 from the clock generation circuit 19'O.
However, when the load signal is not applied, the output 886 is O' (no laser writing),
When the load signal S88 is input, data D5 to D12 are serially converted and output.

At this time, gates 207 to 209 provide 1 to 8 bits.
It will be loaded every cycle. Here, the generation timing of the load signal will be explained.

When there is a place to actually write, data must be set every time the paper size changes, but the counter that controls this is the left margin counter 276 (Fig. 25).
The data is 69 in Figure 29. dlo) and write margin counter 277 (data is d11.d1 in FIG.
2>. In this case, set ↓ defines the distance between left and right with the center of the paper as a reference. H.S.
LST signal (S78) in synchronization with YNC signal
When , the 7 rib flop 196 is set, which causes the gate 198 to flash and the counter 276 to start counting. In this case, the count is 1 video black ivy.
Instead of counting every bit, it counts once every 8 bits. , the LST signal (S78
) is counted in synchronization with Then, it starts up as soon as it is set and outputs the count number. Therefore, the gate 201 determines the vertical direction, and the gate h 199 determines the horizontal direction, so that writing is performed at the point when both gate outputs become (1, 1). At this timing, the load signal is output, and the data 386 from the shift register 210 is serially converted and sent.

Line memorator 1 to signal LMO (S80) is the output of OR game 1-222. This is line memory 213
and 214 to be sent fl17
1". That is, this sending timing is controlled by the flip-flop 70 knob 203. That is, the output state of this flip-flop 203 changes every time a clock pulse is applied. This will open the line memory 213 alternately.
Alternatively, the 214 outputs DOU are read out alternately. The timing of inputting and outputting to line memories 213 and 214 is also controlled by gates 217 and 218 listening alternately.

This is done in order to facilitate processing by allowing data to be written and read at the same time when a shadow method, which will be described later, is employed.

Next, LDAONl (S81) will be explained with reference to FIG. 43 as well.

In the recording device of this scale, if the laser is not emitted over the entire axial direction of the photoreceptor 301, for example, a small size paper (such as B5 or A4 paper 458 shown in FIG. 43) may be In many cases, printing is only performed on the paper, and as a result, toner and the like do not adhere to the area near both ends that are not used. Further, even in a large size sheet (for example, sheet 461 in FIG. 43), there is an unused area (even in the case of small size sheet 458, the used area is within the shaded area 459). If you create an area where toner does not stick for a long time like this, the blade will remove the toner from sticking after recording.
~ At the stage of scraping off the blade, there is a problem in that the contact resistance of the blade in the unattached area becomes large and scratches the surface of the photoreceptor.Therefore, in this device, the time chart shown in Fig. 31 As shown, the line data on signal LDAON1 (8
81) and print data signal 8V within this generation period.
1] AT1 (S47) is forcibly applied, and by this operation, a line (@ > 460 and 463) covering the entire axial direction of the photoreceptor as shown in Fig. 43 is printed after printing for one sheet of paper is completed. In this case, the timing of writing line data is the data l DATn- one before the final stage data L D AT n in the data of the line memory out signal LMOTI (380). A predetermined time t from the falling edge of 1
It is set to occur when x has elapsed. Note that such a line does not necessarily have to be drawn periodically after each sheet of paper has been printed, but may be drawn in circles for each lot (for example, every 10 sheets or every 100 sheets). It may be set to

Next, with reference to Figures 33 to 36, we will explain in detail the method used to make characters easier to see (also referred to as the shadow method) by creating "shadows" on printed characters. .

Determination as to whether or not to generate the shadow signal 848 is made by various gates 220 to 225 which alternately input data from the line memories 213 and 214, and three flip-flops 2.
26 to 228 and the gate 231 on the output side thereof. Among them, the flip-flop 227 is in the horizontal direction (
The Noritsubu flop 228 contributes to determining shadows based on changes in level in the vertical direction (line direction), and to determining shadows based on changes in level in the vertical direction (vertical direction). That is, if the serial data to be written is read from the line memory 213 and sets the flip-flop 226, the data in the previous line direction is stored in the flip-flop 227, so the current data is set to O', for example. When the previous data is in the state of .degree.1', the shadow signal S48 is output. Similarly, the data of the previous line and the data of the current line are compared at the gate 223. For example, when the data of the current line is "0" and the data at the same horizontal position of the previous line is "1", the flip-flop is activated. When both flip-flops 227 and 228 are set, a shadow signal is generated.A shadow signal is also generated when both flip-flops 227 and 228 are set.This state is expressed by the shadow out signal SOU-1 (886) in FIG.
data signal VDAT1 (847), data signal MsDA
It is shown as T1 (S48).

FIG. 33 shows a conventional development pattern when the shadow method is not used, and FIG. 34 shows a development pattern when the shadow method is used. In this way, when the characters [-謹] are printed, a shadow is added to FIG. 32, making it very easy to see.

FIG. 36 is a characteristic diagram PA that intersects vertical line S1 and horizontal line s2 and shows the relationship between exposure position and exposure energy in the upper right area of the figure.
T1. PAT2 is shown in a characteristic diagram Q showing the relationship between the surface potential of the photoreceptor and exposure energy in the upper left area of the figure, and characteristic diagrams R1 and R2 showing the relationship between the exposure position and the surface potential in the lower left area of the figure. In this figure, among the characters in Figs. 33 and 34, "8" in the X direction and "14" in the Y direction.
~21'' is extracted. As shown in the figure, the third
The characteristics PATI and R1 of the pattern shown in FIG. 3 are different from the characteristics PAT2 and R2 of the pattern shown in FIG. In particular, regarding the development characteristics, at a certain development level L, the width D1 of R1 in FIG.
It can be seen that the width D2 of R2 in the figure is more sensitive to people. In addition, FIG. 35 is a characteristic diagram showing the relationship between exposure position and exposure energy, and the energy of P (ON) during laser irradiation is, for example, 5 mw, and P (SH) when creating the white part.
The energy is, for example, 4mW.

If we set j to the above shadow method, we get the following.

In a device that records recorded information (character information, etc.) on a recording photoreceptor by beam scanning corresponding to differences in beam intensity (), serial binary input data is transferred to beams having first and second intensities (as described above). P (ON> and P (OFF)), and when the input data has a specific relationship, the first or second intensity beam is replaced with the first or second intensity beam. Recording is performed using a beam with a third intensity (halftone) located in the middle, and this specific relationship can be determined, for example, when beam scanning is performed sequentially for each horizontal line, (a) horizontal It is determined that the binary data appearing on the line changes from significant recorded data (data that does not form characters) to unintentionally recorded data (data that does not contribute to character formation), and (b) comparing the data of the current line in the horizontal line with the data of the previous line in the vertical direction corresponding to the position; Similarly, when significant recorded data changes to unintentionally recorded data, the unintentionally recorded portion immediately after the change is scanned with a beam of a third intensity.

Note that when adding the shadow, it may be applied regardless of the type of recorded information (for example, text information and image information), but
It is preferable to use this method only when dealing with textual information. In this case, as shown in the flowchart (A> in Figure 55), the microprocessor determines whether or not there is a "Shadow" flow. If it is something (for example, image information), I disable "Shadow" and have it run automatically1. In this case, the command is rsONF Shadow 0N10F shown in Figure 27.
It is FJ. Or on the panel part "Shadow 0N10"
FF" switch may be provided so that the operator can select it arbitrarily.

If the above-described shadow method is used, if the recorded information is character information, a "shadow" can be added, so that the printing quality can be improved. In particular, it is possible to prevent one line shift due to a drop in the printing temperature of a single dot line, which was a drawback of the conventional recording method using a binary beam staff, which is used during high-density beam recording.As a result, the printing temperature of a single dot line can be reduced. Therefore, the printing quality can be improved even for a high-dot Kanji font such as a 40×40 dot configuration. Further, since the permissible range of the vertical deflection of the beam on the photoreceptor 2 due to the "plane deflection" of the polygon mirror can be widened, the polygon mirror can be easily processed and has the advantage of being inexpensive.

In addition to character information, the shadow may also be applied to simple graphic information.

Next, regarding charge correction, FIGS. 37 to 41 and 56
This will be explained with reference to the flowchart shown in the figure.

FIG. 37 shows an example of a configuration in the charging high voltage power supply circuit 160, which is a configuration example of the high voltage power supply 0N10FF signal S.
A voltage control circuit 445 whose operation is controlled by 35, a voltage transformer 446 to which a frequency output is applied to the primary side by this voltage control circuit 445 and a high voltage output is generated from the secondary side, and an output voltage of the step-up transformer 446. a high-voltage rectifier circuit 447 that rectifies and applies a rectified output to the charger 30/I, and a current/voltage conversion circuit 450 that inputs the current flowing to the charger 304 and converts it into a voltage.
and 44 operational amplifiers, which have one input as the output of this current/voltage conversion circuit 450 and the other input as the output of the control reference voltage generation circuit 448. The control reference voltage generation circuit 448 receives the analog control signal 83
6 to output different control reference voltages. With such a configuration, the voltage control circuit 44 is controlled based on the output from the control reference voltage generation circuit 448.
5 is determined, a high voltage output is generated based on this, and the current of the charging charger at this time is applied to the current/voltage conversion circuit 450, and this output voltage and the reference voltage are converted by the A amplifier 449. Since the comparison is made and the control operation is performed so that the two match, the output applied voltage can be stabilized.

Here, the contents of the analog control signal S36 will be explained in detail.

As shown in FIG. 38, the photoreceptor 301 has a characteristic that its surface potential changes significantly with changes in humidity.

In the figure, the horizontal axis represents temperature, and the vertical axis represents surface potential change △vQ.
This shows the type of drum: 451°452.45
Each type has different characteristics. Also, the 39th
The figure shows each drum 451, 452, 4 at a temperature of 25°C.
．． 53 is a characteristic diagram showing the relationship between the drum inflow current ID and the surface potential VO, which is a proportional straight line. Therefore, in order to keep the surface potential constant, the drum inflow current ID
It would be a good idea to change the . For example, for the drum with characteristic 451 in FIG. 39, in order to maintain the surface potential of aoov, ID is subtracted from the inflow current change corresponding to the surface potential change amount △VO, and for the drum with characteristic 453, the surface potential C is △ Inflow current change amount AI corresponding to vo”o
It can be seen that it is sufficient to increase the value by D=(various characteristic data of the photoreceptor are stored in the RAM 107). Here, since the inflow current ID and the output current have a corresponding relationship as shown in FIG. , 4V, and 6V, the above-mentioned inflow current ID can be adjusted.
Figure 1 shows the relationship between analog input current (output voltage of the D/A converter 165 in Figure 15) and temperature.
For example, the temperature of the drum 301 may be detected by the temperature sensor 342 (thermistor shown in FIG. 14), and the analog control signal 836 may be applied in response to the temperature change.

The charge correction is performed based on the above contents, and its operation will be explained based on FIG. 56. 14th
When the thermistor 342 shown in the figure detects the temperature of the drum, the A/D converter 271 converts it into a digital signal, and when the data conversion is completed, the temperature data DTl'1 and the temperature of the drum at a temperature of 25°C are calculated. Temperature data DT 25
Read the value DΔT obtained by subtracting . Next, read the base Qj data DV25 at a temperature of 25°C, DV25-1-D
It calculates ΔV and outputs the calculation result DVn to the D/A converter 165. Then, the drum characteristic data at address r6000J shown in FIG. 45(B) is set to RΔM10.
7, identify the drum characteristic number, and further read the feedback error data DΔV. Next, the reference data DV25 at a temperature of 25° C. is read, DV25+DΔV is calculated, and the calculation result DVn is output to the D/A converter 165. Then, Vn is applied to the analog human horn of the charging high voltage ff1lli160 (336> and the control input signal S35 of the charging high voltage power source 160 is turned on to perform correction.The above correction is repeated every time the temperature changes, and the drum to keep the surface potential constant.

Note that the characteristics of the various photoreceptors (drums) stored in the nonvolatile RAM 107 can be specified by the operator from the outside. That is, as shown in the flowchart ◎ in FIG. 60, when it is determined whether or not to replace the drum,
If the drum is to be replaced, the drum characteristic number is set and the test key is turned on, after which the drum characteristic number is written in the drum characteristic number area of the non-volatile RAM 107. Therefore, thereafter, the characteristics of the drum currently in use are always selected, and corrections are made based on this.

When the charge correction described above is performed, the charge potential of the photoreceptor is kept constant even if the temperature of the photoreceptor changes due to changes in the external environment or increased humidity in the gas, so the charge potential based on temperature changes can be adjusted. It is possible to prevent defects such as fogging due to a decrease in print density, a decrease in print density, or an increase in charging potential, and it is possible to always provide clear prints. Further, in this embodiment, by inputting (external setting) information classifying the temperature characteristics of the photoreceptor, correction is performed accordingly, so that temperature correction of charging characteristics can be performed with extremely high accuracy. Therefore, variations in the temperature characteristics of the photoreceptor itself can be alleviated, and there is also the advantage that the range of specifications for the photoreceptor can be expanded.

Next, the flowchart 17 of FIGS. 47 to 56 and the fifth
The operation of the entire apparatus will be explained with reference to the time shifts shown in FIGS. 7 to 59. Here, we will define each timer (counter) used in the following explanation of operation. Timer Δ is for so-called standby operation from the start of printing until issuing VSYNC, and timer B is for VS
The data reception is controlled from the generation of YNC to the data collection. Timers 〇 and D are used to control from the start of data transfer to registration motor stop, toner replenishment, etc., and timer F is used to complete data reception and control the stop sequence. be.

After the power is turned on, the door switch 129 is turned off.

11F paper stitch 336 is OFF, manual stop switch 328 is OFF, pass sensor 123 is OFF,
It is confirmed that the temperature fuse 130 is not disconnected and that the paper discharge tray 384 is not full (F LJ L L ), and it is further confirmed whether the mode is test print mode, maintenance mode, or replacement mode. If there is no problem, the MC relay 131 is turned on, the fixing unit heater lamp 333 is turned on, the scan motor 312 is turned on, and timer A (IMA) is started. Timer A
When TIMA counts a predetermined time t1, mechanical parts such as the drum motor and developer motor turn on, and then T'1
When the MA counts a predetermined time t2, the laser 344 is turned on. When time t25 is counted by TIMA, it is determined whether the laser is ready or not. If yes (Y), then TTMA = t26 is set to 4 o'clock and the transfer charger, laser, image carrier motor, and developing sleeve bias are all set to 0. "F", and furthermore, when the time T)MA=t27 has passed, the drum motor, heat roller motor, static elimination lamp, and pre-transfer static elimination lamp are turned OFF.Next, 11M△-
Skin motor ready at timing t29, 1-1s
YNc ready is judged, if yes (Y) then TI
MA becomes a stop (Figure 47).

Next, it is determined whether the status is ``1~Rayful out of 4'', it is determined whether ``toner bag is replaced'', and whether or not there is ``]-no toner''. 1-
After removing the paper in the tray, set the [1 Hey Full J flag to O' and reset the paper output tray counter. If it is "toner bag replacement", the reset will be performed when the state returns to the original state, and toner replenishment will be performed. In this case, a reset is performed when the device returns to normal. After passing through the above flow, it is then determined whether or not there is 1 power rape in "Status 3", and if no (N), then it is determined whether 1 paper is missing in "Status 4", If YES (Y), it is determined whether or not cassette paper out detection is ON; if NO (N), the ``Paper out'' flag is set to 0', and if ``Fuser ready'',
"Status Waiting" flag is set to ``O''.

By the way, if the determination result of whether or not cassette paper out detection is ONJ is YES (Y), then it is determined whether the manual feed selection switch is ONJ or not, and if the determination result is NO<N). If the result of the determination is yes (Y), the out-of-paper flag of status 4 is set to O', the manual feed status is set, and the status 1 is set. Set DATA41 to 1 to indicate manual feeding. After that, L shown in FIG.
Manual feed indication is performed by lighting the manual feed designation segment 365 of the CD display 359, and the segment 36
2 displays the paper size. Even if the manual feed mode is entered, the paper size should not be changed as it is, so the contents of the paper size register are not changed, and therefore the paper size displayed by segment 362 remains unchanged. Therefore, when the operator is out of paper, he or she can recognize the need for manual feeding from the manual feeding display, and can also recognize the size of paper that should be manually fed from the display by segment 362. Therefore, it becomes possible to continue recording by manual feeding. After the above-mentioned manual feed display and paper size display, the above-mentioned determination as to whether or not the fixing device is ready is performed. Next, IPRDYON and IPREQON are used, and it is determined whether "power saving" is in progress and whether "one paper is out" or not, and if there is no problem, ITMA starts 1-. T.I.
At MA=t01, the registration motor 149 is reversed and TIM
At A=t02, the registration motor stops. At this stage, the leading edge of the paper is held between the paper feed rollers. Next, it is determined whether or not it is "manual feed", and if no (N), rIPRNT
It is determined whether it is ONJ or not, and if yes (Y), l-
I P RE Q OFFj. Next, timer E(T
It is determined whether IME> is operating or not, and if it is operating, "
TIME=t 30 is determined, and if YES<Y), TIME is stopped and the transfer shutter 305° peels 11
1 (peel) V-jiv3'06, the developer motor 141, and the fixer motor 143 are each turned on. I
If 'TIME=t 30J, TIME is stopped and the flow shifts to (2) (Fig. 48).

Next, TIMA starts and plaid solenoid 158
is turned on, l-T rMA=t I J -c developer motor 141. Static elimination lamp 302. Pre-transfer static elimination lamp 303. Each of the drum motors 147 turns ON. r
Transfer charger 305.TIMA=t2J. The fixing device motor 143 is turned on.

rTIMΔ-t3,1 Hakurichi 17-dity 306
turns ON, and then when rTIM△==t, 4 J, TIMA is made to star 1 again from I O+. Next, it is determined whether the cassette is "manual feed" or not, and whether the cassette is in the upper or lower row.
If it is the upper stage, the paper feed motor 151 is rotated in the normal direction to feed the upper stage, and if it is the lower stage, the paper feed motor 151 is rotated in the reverse direction and the paper is fed to the lower stage after waiting until rTTMA=t5J. Next, turn on the laser 344 when rTIM△-・15'', and turn on the electrostatic charge p30 when rTIMA=t6J.
Turn on 4.

Check whether the laser is ready with rTIM△-t7J, and if yes (Y), rVs in "Status 1"
"YNc request" flag is set to 1'. After that, timer B (TIMB) is started and the flow shifts to ◎ (Fig. 49).

Next, the paper feed motor 151 is stopped at rTTMA=31J,
rVSYNC command received” and select YES (Y).
If so, determine whether IT IMB<1: 32J,
If YES (Y), TIMB is stopped, the count of the 1st page top "[page end counter"] is started, and image writing processing is performed. Timer〇、D(Ding [MC
,D>, and TIM with rTIMA-↑34"
A stop, paper feed motor 151 is stopped. Then rTI
When MO/D=t35j, the registration motor 149 rotates forward, and the talk counter 354 turns on! :,L,,rTIMc/D
= t36] to determine whether the toner concentration is high or low. If the density is low, the toner supply motor 159 is turned on.

[Next page end interrupt] is determined, and if YES (Y>), an image writing end I PEND pulse is output.

After that, each counter is set to +1, and the commands are "Train, Iffle", "Drum Replacement", and "Developer Replacement".

If it is "heat roller replacement", each status will be displayed.In addition, the determination result of "rVsYNc command received" is
If no (N), the charger 304 is turned off when rTIMB=t46, and the laser 3 is turned off when rTIMB=t47J.
44. Peel charger 304 OFF, rTIMB=t
47J and laser 344. Hakuri Charge 17306
, turn off the developer motor 141, rTIMB, respectively.
-T 48J with transfer charge v305. Serving machine motor 1
43 are respectively OFF, and the drum motor 147, the static elimination lamp 302, and the pre-transfer static elimination lamp 3 are turned OFF.
03 respectively, and rTIMB=t50'', the plaid solenoid 158 is turned off.

Also, in the flow of rTIMB<t 32j, −(N>
If so, then determine whether rTIMB<t33J, and if no<N
>, TTMB is stopped and TIM'A is started. After that, turn on the plaid solenoid 158 and rT
At the stage of IMA=tIJ, the developer motor 141. Drum motor 147. Static elimination lamp 302. Pre-transfer defrosting lamp 30
3 are each turned ON. and rTIMA=t2J
When the transfer charger 305. Turn the fuser motor 143 to O.
N, rTIMA=t3J sharpener charger 3
Turn on 06. Next, it is determined whether rT IMA=t 4j or not, and timer A is temporarily stopped and restarted. The developer motor 141. Transfer charger 305. Hakukuchaja 306. Each of the fixing device motors 143 is turned on. rTIMA=t5J
At 6J, the laser 344 is ON, IT IM=t, and at 6J, the charger 304 is ON, at rTIMA=t 7J, it is determined whether the laser is ready or not.
Stop A (see Figure 50 above).

Next, it is determined whether the 11-toner full detection switch 1.26 JOI" is 1 or not, and if it is ON, a display is performed. If it is not ON, it is determined whether the toner empty detection switch 125 is ON or not, and a display is performed. Next, it is determined whether it is "manual feed 1" or not, and if it is not manual feed, it is then determined that "specified cassette paper is out", and if there is no paper, a message to that effect is displayed, and a 5TPF (
Stop flag) is set to '1'. Next, timer E (
TIME). Stop flag is '1'
If so, set 5TPF to '0' and print ready IPR.
Turn DY off. , 5TPF = 1, it is determined whether or not it is "manual feed 1", and if it is "manual feed 1", TIME stop, manual stop switch 328
OFF, manual feed 'O', TIMB stop, cassette paper out detection switch is determined to be ON or not. Next, the print request IPREQ is set to ON, and the fourth
The process moves to the flow indicated by ■ in Fig. 8 (Fig. 51 above).

Next, the contents of the timer interrupt in each flow will be explained with reference to FIGS. 52 and 53.

This determines whether or not each of the timers A, B, C, D, and E is in operation, and counts up when each one is in operation. Read all input information in the port input reading part. Then, the timer is stopped at rTIMc/[)=t38J, and it is determined whether or not rTIME=t39J. From then on, the operation of timer E, <TIMF) is continued, and one toner replenishment motor 159J, r "registration motor 149" is stopped. Then r T
After IMF=t4J, it is determined whether or not the rTIMA is in operation (this is to determine whether or not the next sheet of paper is to be printed). If TIMEA is in operation, TIME is stopped. that IrTIME=t
Charger 304.41J. OFF.

"T TME=t Turn off the laner 344, peel charger 306, and developer motor 141 at 42J.
shall be. , rl1ME=t 43J transfer charger 3
05. Turn off each fuser motor 143, rTIM
E=t44J, drum motor 147, static elimination lamp 302
．． The pre-transfer static elimination lamps 303 are each turned off (see FIG. 52).

rTIME=t 45J and plaid solenoid 158O
FF, TIME stop, determination of whether "fuser temperature is normal" or not, determination of "fuser humidity fuse stage", "scan motor 312 ready", and "door switch 129 OFF" are performed, depending on each state. , various processes are performed.

Next, the contents of the command interruption in each flow will be explained with reference to FIG. 54. When command interrupt processing starts, it is determined whether or not there is a "parity error", and if it is an error, [Status DATA 81j flag is set to 1].
', and it yells, "Illegal command error." If it is a "parity error", the "status request" is SR1~
6, and if it is within the range, an output corresponding to one of them is generated. If it does not correspond to any of the "Status Requests", it will be determined whether it is [1~Tsubu/Bottom Margin], and if so, it will be determined whether it is "Top/Bottom Margin".
``Bottom Margin'' is specified, ``Status Sera 1~'' becomes 1', and any one of ``RDATA21~11'' is specified. If it is not "Top/Bottom Margin", it is determined whether "1 Manual Feed Designation" is selected, and if YES (Y), manual feed display and paper size display are performed next, and the paper size register is set. Then, with the manual feed status set, the status becomes 1 and the rDATA41J flag becomes 1.
', then the flow shifts to status 4 where the paper out flag becomes 0'. When it is not "manual feed specification", "
It is determined whether or not the "nokoset designation" is made, and the "casette designation" is determined.
If so, the upper/lower display paper size is displayed, the paper size register is set to 1, the manual feed status is reset, the status is 1, and the DTΔ41 flag is 0'.
It is determined whether or not there is no paper in the cassette, and if there is no paper, the flag is set to '1'. If it is not "saw set specified", it is determined whether the "select lamp is lit" or not, and it is determined whether the online select lamp (specified by an external device, for example, the host side) is lit. If the select lamp is not lit, it is determined whether the select lamp is off or not. If YES, the left lamp is turned off; if NO (N), the process moves to the next flow.

Next, the flowchart shown in FIGS. 55(A> to 55(C)) will be explained.

FIG. 55 (A> includes ``power save'' in addition to the above-mentioned 1 shadow method, and if ``power saving'' is in progress, the scan motor 312 is turned off.

The fuser is controlled to the power save temperature and set to "Status 3 power save flag 1", and when the power save is canceled, the scan motor is set to 312°N, the fuser is controlled to the normal temperature, and "Status 3 power save is set to 7 lag 0".
”, and if it is “Start image data transfer”, it is shown in Figure 55 (B
), the process moves to the flow of (C).

The paper size register is read, the top margin table data (Dl) of the specified paper size is read,
It is determined whether the top/bottom margin designation is 5mm,
If the answer is NO (N), the top/bottom margin change table data D2 is read. Next, top margin table data D1-)-margin change table data D2
calculation is performed, and the top margin adjustment switch (14th
The contents of 442) in the figure are read. Next, the top margin adjustment table data D3 corresponding to the switch is read, and the margin adjustment table data D3 is added to and subtracted from the values of Dl and (D1+D2>), and the calculation result D4 is let into the page top counter 278.

And bottom margin table data D for the specified paper size
5 is read and the top/bottom margin specification is 5n+m
If it is NO (N), the top/bottom margin change table data D2 is read, the bottom margin data D5 is subtracted from the margin change table data D2, and the top margin is adjusted. The contents of the switch 442 are read, and the top margin adjustment table data D3 corresponding to the switch is read. Next, the margin adjustment table data D3 is added to or subtracted from the value of D5 or (D5-D2), and the calculation result D4 is set in the page counter 279. Next, the light margin table data D7 of the specified paper size is read, and a cassette/manual feed is determined. If the cassette is selected, it is determined whether it is the upper stage (reference) or not, and if it is not the upper stage, it is the lower stage, and the hlet upper / lower stage adjustment switch
), and select the switch corresponding to the switch.
Read the lower adjustment table data D8. The D8 is added to or subtracted from the value of the D7, and the calculation result D9 or the D7 is set in the write margin counter 277. If manual feed is specified, read the contents of the cassette/manual feed adjustment switch (440 in Figure 14), read the current/manual feed adjustment table data D10 corresponding to the switch, and then set the adjustment table data to the value of D7. D10 is added and subtracted, and the calculation result D11 is sent to the light margin counter 2.
Set it to 77.

Next, left margin table data D1 for the specified paper size
2 is read, cassette/manual feed is determined,
If it is a cassette, it is determined whether the
If it is not the upper stage, it is determined that it is the lower stage, the contents of the cassette upper/lower stage adjustment switch 4/IO are read, and the cassette upper/lower stage adjustment table data D8 corresponding to the switch is read. The data D8 is added or subtracted from the value of the D12, and the calculation result D13 or the data D12 is set in the reflex 1 to margin counter 276. Also, if you feed it manually,
Read the contents of the cassette/manual feed adjustment switch 441,
The cassette/manual feed adjustment table data D10 corresponding to the switch is read, and the data DIO and the data D1 are
2 and sets the calculation result D14 in the left margin counter 276.

The details of the cassette paper printing during the aforementioned flow are shown in the time chart of FIG. 57.

When the print start signal IPRNTφ (865) is output, the print start permission signal IPREQφ (362) is set to -F.

After that, the elevator motor 141 etc. were turned on, and the time also changed from 4 to 4.
During t8, the paper feed motor 151 operates to transport the paper in C tray i~. At this time, the laser diode 344 is turned on at time t5, and data writing starts from time t7 (the diagonally shaded period from time t7 to t11 is the data writing period).

At time t9, the registration motor 149 rotates, and the data written on the photoreceptor is transferred to the paper. Data prediction is performed until time t11 when IPREQφ (S62) falls, and after time t1'l has elapsed, the registration motor 1 continues until time t12.
49 continues to rotate and stops. laser diode 34
4 then turns off at time t14.

FIGS. 58 and 59 are time charts for explaining the operation of printing on manual paper. In the following explanation, we will explain the differences from the case of cassette paper printing.

In FIGS. 58 and 59, the paper feed motor 151 is not used, and the registration motor 149 is rotated in reverse to drive the paper feed roller, and is used for paper conveyance, and the registration roller is driven by forward rotation. ing. Also, both of them are 1"
IPRE is a command to start printing after receiving a manual feed command.
Qφ (862) is made to rise. Figure 58 is 1
This shows a case where paper is set in the manual feed guide before the "manual feed command" is generated, and when the manual feed switch 326 is turned on due to paper setting, the time t0
After 1, the registration motor 149 rotates slightly in the reverse direction, inserts the leading edge of the paper, and then stops, and at the time when the "manual feed command" is issued and IPREQφ (S62) rises, the registration motor 149 rotates in the reverse direction again and inserts the leading edge of the paper. is conveyed to the transfer position and then stopped. Therefore, it is possible to print on paper from the cassette before issuing the "manual feed command".

The case shown in FIG. 59 is a case where the manual field switch 326 is turned on after the "manual feed command" is issued first, paper is set in the manual guide, and in this case, the registration motor 149 is turned on after the predetermined time t01 has elapsed. It is conveyed to the transfer position by continuously rotating in reverse. In either case, the Manico Als 1 hep switch 328 is set to O.
Time t2 after a predetermined period has elapsed while FF is running (time t20)
1, the registration motor 149 is stopped, and as a result, even if the paper set in the manual feed guide is longer than the displayed size, "jal\" will not occur. In the case of cassette paper, such consideration is not necessary since the size is specified. Therefore, even if the cassette paper runs out, printing can be performed by preparing paper of a size larger than the size of the information to be printed, and it is also possible to use paper of a size that is not in the standard, making it possible for the device to usage will increase.

Flow (2) is a transition from the flow shown in FIG. 47 above.

The contents of (1) and (2) will be explained with reference to FIG.

When the test print mode is selected, the flow shifts to (2), and the print specified by the print mode No. is executed via the test key. When the maintenance mode is selected, the flow moves to ■, and the maintenance mode operation of No. specified via the test key is executed.
When the replacement mode is selected, the flow shifts to O, and it is determined whether "drum replacement", "developer replacement", or "heat roller replacement" is required, respectively.
``Developer replacement No. set'', ``Heat roller No. 1~
”, the non-volatile generation RA-M2O3 is generated via the test key.
Predetermined data processing is performed on the data.

FIG. 61 to FIG. 63 are correspondence diagrams showing correspondence between display numbers and respective contents.

(The following is a margin) [Effects of the Invention] According to the present invention described in detail above, when there is no paper in the paper storage section, the mode is automatically switched to the mode in which the manual paper supply means feeds the paper, and furthermore, the mode is automatically switched to the mode in which paper is fed by the manual paper supply means, and furthermore, the mode is automatically switched to the mode in which paper is fed by the manual paper supply means. The mode for feeding paper and the size of the paper to be fed are displayed. Therefore, the operator can continue recording by inserting paper in accordance with the display. Therefore, it is possible to improve the efficiency of recording work.

(Margin below)

[Brief explanation of drawings]

Fig. 1 is a system block diagram showing the relationship between the device according to the present invention and external devices, Fig. 2 is a schematic sectional view of the print control unit (printer) in the system diagram, and Fig.
FIG. 4 is a schematic perspective view showing the relationship between the Laser Skillena unit and the recording photoreceptor in the figure, FIG. 4 is a schematic diagram showing the paper feeding section in FIG. 2, and FIG. 6 is a plan view showing the operation panel section of the device of the present invention, FIG. 7 is an enlarged plan view of the display section in FIG. 6, and FIG. 8 is an example of the data control section shown in FIG. 1. The block diagrams shown in FIGS. 9, 10, and 12 are the formats 1 to 1 of the data handled by the data control unit, respectively. Figure 13 is a block diagram of the print control section in Figure 1.
Figure 4 is a detailed circuit diagram of each detector in Figure 13, and Figure 15.
The figure is a block diagram showing details of the drive circuit and output element in Fig. 13 (), and Fig. 16 is a circuit diagram showing details of the motor drive circuit and laser scan motor in J3 in Fig. 13.
FIG. 17 is a detailed circuit diagram showing the laser modulation circuit and semiconductor laser in FIG.
0 is a time chart for explaining the operation of the circuit in FIG. 17, FIG. 21 is a detailed circuit diagram showing the beam detection circuit and beam detector in FIG. 13, and FIGS. A waveform diagram for explaining the operation of the circuit shown in Fig. 23 (A
), (B) are front and side views showing an example of the structure of the beam detector, FIG. 25 is a detailed circuit diagram of the print data writing control circuit in FIG. 13, and FIG. 26 is the same as in FIG. 13. Figure 27 is a circuit diagram of the interface circuit used in the device of the present invention.
FIG. 8 is an explanatory diagram showing the contents of the status used in the apparatus of the present invention, FIG. 30
The figure is a plan view showing the print area of the entire surface of the paper including the paper size shown in Fig. 29, Figs. 31 and 32 are time charts for explaining the operation of the circuit shown in Fig. 25, and Figs. 33 and 32 are Figure 34 is a diagram of the printing pattern printed on paper, Figure 35
36 are characteristic diagrams showing the relationship between exposure position, exposure energy, surface potential, and exposure energy and exposure position to explain the exposure control operation in the circuit of FIG. 25, and FIG. 38 to 41 are characteristic diagrams for explaining the operation of the circuit shown in FIG. 37, and FIG. 42 shows the relationship between the laser scanner unit and the recording photoreceptor in FIG. 2. FIG. 43 is an explanatory diagram showing the relationship between the recording photoreceptor and paper, FIG. 44 is a modification of the paper ejection tray shown in FIG. 5, and FIG. 45 (A). (B) and FIG. 46 are detailed diagrams of data recorded in each recording device in FIG. 13, FIGS. 47 to 54, and FIGS. 55 (A), (B), and (C).
. 56 and 60 are flow charts for explaining the overall operation of the device of the present invention, FIGS. 57 to 59 are time charts for explaining the operation of the device of the present invention, and FIGS. 61 to 63 are flowcharts for explaining the overall operation of the device of the present invention. FIG. 3 is a relationship diagram showing display numbers and their contents in the invention device. 1... External device, 101... Control means, 301...
・Recording medium, 311... Information recording means, 317.32
1... Recording medium storage unit, 318.322... Conveyance means, 319.323... Medium presence/absence detection means, 320.32
4... Medium 4 noise detection means, 327... Medium manual supply means, 359... Display section. Agent Patent Attorney Tadashi Misawa This J4 4LC8- Figure 19 l5 (OFF) Yo, 1 Eyu Figure 42 Figure 43 bJ

Claims (1)

[Claims] A device for recording information from an external device onto a recording medium by beam scanning, comprising: a recording medium storage section housing a plurality of recording media; a manual recording medium supply means for manually supplying the recording medium; a medium presence detection means for detecting the presence or absence of a medium in the recording medium storage section; a size detection means for detecting the size of the medium storage section; Upon detection, a control means stops the operation of the conveyance means, switches to a mode in which a recording medium of the same size is conveyed from the medium manual supply means, and displays on a display unit the fact that the manual supply mode is in effect and the medium size. A recording device comprising: