JPS60237465A - Recorder - Google Patents

Abstract

PURPOSE:To improve the efficiency of a recording operation by allowing execution of a recording operation if the size in housing parts for recording media is larger than the size of the recording medium to be assigned from the outside even when both sizes are different. CONSTITUTION:The housing parts 317, 321 for the recording media in which the plural recording media are housed and the means for storing the size information and recording information of the recording media assigned from detecting means 320, 324 for detecting the medium size in the housing parts for the recording media are provided. The size information of the recording medium from the outside device is compared by the means 320, 324 and when both are the same or the medium size in the containing part for the recording media is larger, the recording based on the storage information in the storage means is executed. The execution of the recording operation is thus permitted if the size in the housing part is larger in the above-mentioned way and therefore the efficiency of the recording operation is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for scanning a recording medium and recording recorded information on the recording medium.

[Technical background of the invention and its problems] In this type of device, a plurality of sheets of paper, which are recording media of various standard sizes, are stored in a cassette, which is a recording medium storage section, for each size, and the cassette is selected. The paper is automatically transported to the recording position.

However, when performing a large number of records (also called printing), there may be cases where the paper in the cassette runs out, and in such cases, it is necessary to stop printing, remove the cassette, and insert new paper. A problem arises in that the printer must be installed in the device again after it has been stored to perform printing operations, which is cumbersome.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a recording device that can improve the efficiency of printing work.

[Summary of the Invention] In order to achieve the above object, the present invention provides an apparatus having an information recording means for scanning and recording information on a recording medium, including a recording medium storage unit storing a plurality of recording media, a detecting means for detecting a medium rise in the medium storage section; a means for storing recording medium size information and recording information designated from an external device; and a means for storing recording medium size information from the external device and the medium size of the recording medium storage section. and if both are the same or the medium size of the recording medium storage section is larger, recording is performed based on the recording information in the storage means.

(The following is a blank space) [Embodiment 1 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 body, 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 mechanical diagram of the printer 300 with a video interleave.
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 LE
It is composed of D. 304 is a charger for uniformly charging the photoreceptor 301 to a predetermined potential.

305 is a transfer charger 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; 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 hit size detection switch (detection means) provided on 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 one 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 conveyance belt for conveying the paper separated by the peeling charger 306 to a fixing device; 331 is a subsequent fixing device for fixing the toner on the transferred 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. This is a paper ejection switch for detecting paper.

337 is a cooling fan for cooling the inside of the printer 300; 338 is the charger 304; 'transfer charger 3o5. A high-voltage transformer that generates high voltages to be applied to the peeling charger 306, the developing device, and the magnet roller 308, respectively.

339 is a power supply device that generates DC voltages used for each control, and 34o 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 f/θ lens 314 and reaches the beam scanning range 3.
48 ranges are scanned from left to right. A part of the laser beam within the beam scanning range 348 is reflected by the reflecting 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. Incidentally, as shown in Fig. 2, the actual printer has an f/θ lens 3.
14 is not directly irradiated onto the photoreceptor 301, but is guided to the photoreceptor 301 by being reflected by reflection mirrors 315 and 316; however, in FIG. 3, the reflection mirror 315 is shown for convenience. and 31
6 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 mounted on a support member 456 located outside the beam incidence area by a hissing member 455 via a plate spring 454, and a small portion is attached to the lower part of this plate spring 454. Adjustment screw 4
57 is provided 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 performed 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 paper feeding is not performed correctly, the paper does not reach the position of the registration roller front path sensor, so the light from the light emitting diode 393 continues to enter the registration roller front path sensor. Therefore, it can be recognized that the 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-inverted type, the first printing paper is -
Because it is on the hanging side, data must be sent from the last page from the information providing device (host system 1), which has the disadvantage that the information file method on host 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 conveying direction. 388 is a paper holding actuator for preventing the paper stored in the tray from floating; 395 is a paper ejection switch for NC confirmation that the paper has been properly stored in the tray 384; 391 is a paper holding actuator for preventing the paper stored in the tray 384 from rising A light emitting diode 392 is used to check the presence or absence of a light emitting diode, and 392 is a tray sensor on the light receiving side. When the paper 390 is in the tray 384, the tray sensor 392 is not irradiated with light, and when there is no paper 390, the tray sensor 392 is irradiated with light, so that the presence or absence of the paper 390 can be detected.

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. is detected by a detection means, for example, a plurality of sensors 401 and 402. In the various states of the actuator 388, the position al is "full of paper", the position a2 is "paper present", a
Position 3 is in the "out of paper" state. The separating means 38
9 separates the actuator 388 at least while the paper 390 is being ejected and moved into the paper ejection tray 384, and when the paper should be detected, for example, during a printing operation or when it is stopped, the actuator 388 is moved in synchronization with the status signal at that time. Solenoid 389 turns off,
The separation of the actuator 388 is released, and a detection operation is performed. Therefore, the discharging leading end of the paper 390 does not collide with the actuator 388, and the discharging operation is not hindered.

Note that each sheet of paper sent into the paper ejection tray is detected by a paper ejection switch 395, and the contents are counted by a paper ejection memory counter (RAM 107 in FIG. 13), which will be described later, to detect the number of sheets. 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 top cover of the printer 300, 351 is a front cover, and 352 is a maintenance cover.
When paper replenishment, toner replenishment, etc. occur, open in the direction of the arrow and process. Further, the maintenance cover 352 is
Although the front cover 351 has a structure that can be opened from the top, it cannot be opened unless the front cover 351 is opened in the direction of the arrow, to prevent the operator from operating incorrectly.

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 the printer 30.
A power lamp that indicates that the power is turned on.
Reference numeral 358 indicates a tray full lamp that indicates that the reversible tray unit 381 is full of printing paper, and reference numeral 359 indicates a color LCD display that displays details of the operating status of the printer. The total counter 353 to LCD display 359 described above are constantly operated or displayed. Next, the maintenance cover 352
This section explains the parts that cannot be operated without opening the . The following parts are to be 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.

407 is an indicator lamp indicating that it is in exchange mode;
404 is a selection switch that selects the operation mode number in each mode; 408 is a selection lamp that indicates that the selection operation by the selection switch 404 is possible; 405 is a test print mode selection and the above-mentioned maintenance, replacement, and test print. 360 is a main exposure adjustment volume which will be described later, and 361 is a shadow exposure adjustment volume. Further, both 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 LCD display 359, and the function of each display segment will be explained 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 when a jam occurs in the paper feeding section, and the segment indicating the paper feeding status also blinks at the same time.

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). At this time, the paper feed segment also blinks at the same time, as in the case of a paper feed jam. 375 blinks when a toner bag (not shown) is full of toner collected by the cleaning blade 310 in FIG. 376 blinks when the toner hopper (not shown) of the developing device 307 runs out of toner. 377 and 378 blink when a serviceman error, which will be described later, occurs. 379
blinks when an operator call, which will be described later, occurs.

3'80 blinks when there is no paper in the selected cassette. 362 displays the size of the selected paper. For example, if the upper cassette side is selected and the A4 vertical paper cassette is selected, Al-R will be lit, and if A6 is selected in the manual feed mode, 86 will be lit. 363 is lit when the lower cassette is selected, 364 is lit when the upper cassette is selected, and 365 is lit when manual feed is selected. 366 represents the shape of the printer 300 and is always on, 367 represents the photoreceptor 301 and is always on, and 368 is the printer 30
0 represents the upper part shape, and is always lit except when the conveyance section is jammed, and 36 is lit alternately when the conveyance section is jammed (when the above 374 is blinking). 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 stores the character code information and image information sent from the host system 1 on the dot-compatible page memory 20 corresponding to the printing area on the paper of the printer 300 after data exchange. 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 accept two types of information. In other words, one is character code information (JIS8
In this case, the character generator 15 generates a character pattern corresponding to the character code, and stores the dot information of the character pattern on the page memory 2o. 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.

Signal line S between interface 50 and host system 1
O2 is sent from the host system 1. The data strobe signal and other control signal line SO3 are the busy signal and status signal line 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, . . . nth line, and finally an END code indicating the end of data for that page. Character code data for one line consists of a code that does not indicate the character size, a character code, and an LF code that represents the delimitation 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. 9 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. 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 7 control circuit 7 using the signal 1i+sO6. Therefore, the paper size data is distributed by distributor 4.
The data is input to the page code buffer 7 control circuit via the data line 807. The next 1st line, 2nd line...
・Data up to the nth row is sent from the distributor 4 to the data line 808
is entered into the page code buffer via . 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. END code detection is transmitted to the page code buffer 7 control circuit 7. When the page buffer control circuit 7 confirms through the signal line S09 that character code input for one page into the page code buffer is completed, data is stored in the page memory 20 in units of one driver 1. .

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 edge 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 3 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, 0) means that both the vertical address (ADRV> and horizontal address (ADRH)) are 0'.In other words,
The write address counter 18 and the read address counter 19 have a vertical address (ADRV) and a horizontal address (ADR+-()) as shown in FIG.
ADRV represents a vertical address (arrow in FIG. 11), and ADRH represents a horizontal address (arrow G in FIG. 11).

43 is the last horizontal address of A3 size paper (, A31
-IE), 44 is the horizontal address of A4 size paper (Δ4
HE), 45 is the horizontal address of A5 size paper (A5H
E). Similarly, 46 represents the last vertical address of A3 size paper (A3VE), 47 represents the vertical address of A4 size (A4VE), and 48 represents the vertical address of A5 size (A5VE). 33 is the A3 size vertical address ADRV-0. Horizontal address A D R+-1-A
3 HE point ADR (0, A3) IE), 34 similarly ADR (0, A4 HE), 35 ADR (0
, A5HE) are shown respectively. 36 is an A3 size vertical address ADRV-(A3VE), horizontal address L/S ADRH=O(7) point ADR(A3VE).

0) and 37 are similarly ADR (A4VE, O).

38 represents A and [)R(A5VE, 0), respectively.

39 is the A3 size vertical address ADRV=A3VE,
Horizontal 7 dress ADR1-1=A3HE(7) Point ADR(A3VE, A31-IE), Similarly, 40 is ADR<A4VE, A48E), 41 is ADR(A
5VE, A5HE') 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 read from the page code buffer 9 via the signal line S10 to the page code buffer 7 control circuit 7. The character size types in this embodiment are basically two types of fonts: 40 x 40 degrees and 32 x 32 dots, and the page code buffer control circuit 7
Then, the character size is determined based on the read character size code, and 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, respectively. Page memory control circuit 1
At 7, the line feed pitch and character pitch are controlled by the character size discrimination signal, and at the character generator 15, the character size area is 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 first shift is ADR (0,0). row buffer 1
The character code data of 0 is sequentially read out in a constant cycle starting from the first digit, and latched in the output latch 12 in order to synchronize with the line counter 13. The first character code (in this example, the ``T'' character) is the output latch 12.
When latched, the character code and the output of the line/scan counter 13 are synthesized in the synthesis circuit 14 and used as a character pattern selection code for the character generator 15.
It is input to the character generator 15. Here, to explain the configuration of the line/scan counter 13, the upper 6 bits are a counter that counts scanning lines, that is, a counter in the vertical direction of the character pattern. Plus, 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 40x40 dot font, it counts from 0 to 4 plus the character pitch control and returns to 0' (because the output of the character generator 15 is 8 bits parallel) It is.

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 at line 0' in the vertical direction and i 0 + 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 value of the write address counter 18 is AD, R' (0, 0>), the vertical address "Q +" and the horizontal address "O'
is written to the address. When writing of the 1-byte character pattern is completed, the value of the line/scan counter changes to (0, 1), and the value of the writing address counter 1
The value of 8 also changes to ADR (0, 1). Therefore, the character generator 15 outputs 1 in the vertical direction of the character pattern.
The data of the 0th trine and the 1'th data in the horizontal direction is output, latched by the output latch 16 as described above, and then written to the ADR (0, 1) address of the page memory 20. In this way, when writing of the last data (data at '4'4') in the vertical 'O' line of one character pattern is completed, the value of the line/scan counter becomes (0,5).
, the write address counter 18 becomes ADR (0, 5). Since the horizontal spacing between characters is 8 dots (1 byte), all outputs of the character generator 15 are forcibly set to "O" by a command from the page code buffer control circuit 7, and the output of the character generator 15 is forcibly set to "O". 7) ADR
('o' is written to the address 0, 5>, and after the write operation is completed, the row address counter is incremented by '1' and the row buffer 1
The next character code from 0 is set in the output latch 12. Also, the line/scan counter becomes (0, 0>), and the write address counter 18 becomes ADR (0, 6).Therefore, next is the page memory of the data of the 'O'-th line in the vertical direction of the character pattern 'O'. A write operation to 20 is performed. At this time, the write address counter 18 is ADR(0,6>
, (0,7), (0,8>, (0°9), (0,A)), and the character pattern data of each O is written to the address specified by the writing address counter 18. I'm going to write to.

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 "+".
1', and the next character code is set in the output latch 12 from the row buffer 11O.

Further, the line/scan counter 13 becomes (0°0), 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 line buffer 10, the "LF" code detection signal is transmitted to the page code buffer 7 control circuit 7 through the output line S14, and the character pattern writing operation from the character generator 15 is performed. After that, the write address counter 18 is sequentially incremented by 1' and O' is forcibly written to the page memory 20.Then, the value of the write address counter 18 indicates that A3 size is currently specified. ADR
When the value of (0, A3HE), that is, the 33rd point in FIG.
1.18(0), line/scan counter 13 is (1
, O), respectively. And output latch 1
2 contains l, which is the character code starting from line buffer 1o.
T l is set again. Then, the character pattern data of the vertical direction "1" line of the character pattern is written into the page memory 20. Similarly, the character pattern data of the vertical direction "2" of the character pattern is written into the page memory 20.

'3'... When the write operation up to the 39th line is completed, the write address counter 18 registers ADR (28, O
), the row address counter 11 is (0).

The line/scan counters 13 are set to (28, 0), respectively. This completes the writing operation of character pattern data for one line, but since the line feed pitch is every 48 lines, O' is forcibly written to the page memory 2o for the remaining eight lines. IO+ for 8 lines
When writing is completed, the address value of the write address counter 18 is changed to the point 61 in FIG.
The row address counter 11 is (0) at R (30, O).

The line/scan counters are each set to initial values (0, O). This completes all write operations including the line feed pitch for one line. and row buffer', 1
The second line of character code data following 0 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 becomes ADR<60. O), the row address counter 11 is set to (O), and the line/scan counter is set to (0, O). 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, 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 S13, and also 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. , A3
8E)) Write "0" in the Flfft format. Then, write "0° at the 39th point in Figure 11, and set the specified paper size 1.
All operations for writing character pattern data for a page into the page memory 2o are completed. The write address counter 18 is ADR (0, O), row 7 DR; 1.
Counter 11 is (O), line/scan counter 13
are all initialized to (0,0).

Next, a case where the data sent from the host 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 a command is given to the distributor 4 to input the next paper size data to the page memory control circuit 17 via the signal line SO6.

Therefore, the paper size data is sent from the distributor 4 to the data line 807.
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 815.
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 (0, O)) in FIG.
The write address counter 18 is set to ADR (
Q, 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 to be input into the page memory 20 from now on is A4, the data length of one line will be a value up to 44 points (A4HE) in FIG. 11, that is, A4HE'. Naturally, the length of the image information per image sent from the host system 1 is 'A4H'.
E', so image data 19 and image data 2 in FIG. ...The data length of the image data m is 'A4V'
E', and the number m of image data is the value of 47 points in FIG. 11, that is, A4VE". Therefore, image data 1 in FIG. (0,O)~34 points ADR
(0°A4HE), image data 2 is a 51 point line, image data 3 is a 52 point line...
The image data m is a line of 37 points, so the final address is 40 points (> ADR (A4VE, A4) - IE)
becomes. Image information is written into the page memory 20 while controlling the write address counter 18 in this manner.

The character pattern data 13 written in the page memory 20 in this manner is sequentially output to the latch 21 . Gate circuit 23. Data to be printed is sent to the print control section through the interface 22 and the interface bus 817. 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 S2.0 are strobe signals when sending command data and print data. S21 is a busy signal line from the print control unit, S22 is a horizontal synchronization signal line from the print control unit, S23 is a page end signal line that also indicates the end of print data, and S24
826 is a ready signal line of the print control section; S25 is a print request signal line that notifies the printable state; and 826 is a select signal line (2 lines) that specifies the data content of the data line in the interface bus S17.

Reference numeral 827 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 unit, printing from the data control unit 2 is started via the start signal line 827.
In contrast, the print control section sends a horizontal synchronization signal 822.

With this horizontal synchronizing signal S22, each data of the 32-point line in FIG. S2
2, the address is sequentially changed line by line according to S23, and the page end signal S23 is sent from the print control section.
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 section (then, when the page end signal S23 is received, the data sending is forcibly stopped. The print control section outputs the page end signal S23 at the same timing as the horizontal synchronization signal S22.Also, in correspondence with the memory addresses in FIG. 11, the last line A3 of the memory area of the paper size has 46 points. , 47 on A4
It is output from the print control unit at the same timing as the point or before it.

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. Control is performed to permit write operations to completed memory areas. 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 2102 for controlling each unit in the microprocessor 101 is an interrupt control circuit for controlling interrupts to the microprocessor 101, and command signal lines S30. Page end signal line S29 from one print data write control circuit. Interrupt request signals from each of the timeout signal lines 828 from the general-purpose timer 103 are sent to the microprocessor 10.
Tell 1. A general-purpose timer 103 generates basic timing signals for controlling paper conveyance, drum rotation processes, and the like. This general-purpose timer 103 is 5I in this embodiment.
It is set to llSeC. 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
This is shown in Figure 5 (A). In FIG. 45(A), the address (
4000, 4001>, top margin control data for paper size A3, atto L/S (4002, jo0
3) contains bottom margin control data and address (4).
0, 04, 4005) contain data for left margin control, and 9 addresses (4006, 4007) contain data for right margin control, respectively. Similarly, addresses (4008 to 400F) contain data for controlling the top, bottom, left, and right margins for paper size B4. Margin control data corresponding to various paper sizes is contained up to address (4087). 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 top margin refers to the area up to the information recording start position in the direction that intersects the beam scanning direction (that is, the paper conveyance direction),
Similarly, the bottom margin refers to the area from the start of scanning in the beam scanning direction to the end of recording, and the left margin refers to the area from the start of scanning to the end of recording in the beam scanning direction. .

Addresses (4100 to 41FF) contain a table of command codes for specifying operations from the data control unit 2, and are used for checking command codes from the data control unit 2. The content of the command is a top/bottom margin change table.

These include a top margin adjustment table, a cassette upper/lower adjustment table, a cassette/manual feed adjustment table, etc. Addresses (4200 to 42FF) contain data on the charging characteristics of the photosensitive drum 301, including five types of data A to F. This data is then used for temperature correction control of the charging charger 304, which will be described later. Addresses (4300 to 43FF) are an exchange data table, and photosensitive drum 301. It contains replacement cycle data for the developer in the imager 307 and the fixing roller 332.

Addresses (4400 to 47FF>) are a control timer table that contains various timer values for performing printing operations, such as each wrestling timing and paper feeding 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 324, 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 recording information (image data, etc.) from an external device sent from the data control unit 2, and if the cassette size is larger, the subsequent stage Print control unit 100 of
It is designed to issue printing operation commands to the printer. Therefore, it is possible to print even if the printing paper is larger than the size of the information sent from the outside, and the usability can be improved. Reference numeral 107 is a non-volatile RAM, and the data in the memory is retained even when the power is cut off. Further, the data contents in the nonvolatile generation RAM are shown in FIG. 45(B). In FIG. 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 at the time of jam occurrence. It is used to prevent forgetting to dispose of jammed paper inside the machine when the power 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(A), the operator is informed by the display on the operation section that the drum should be replaced.

The address (6400) is the developer exchange counter, which is incremented by 1 for each print as in the case of drum exchange, and when the value of this counter reaches the value of the exchange table (developer) in Fig. 45 (A) above. displayed on the operation panel.

Address (6500) is a fixing roller replacement counter, which is incremented by 1 for each printing as in the case of drum replacement, and when it reaches the value in the replacement table (fixing roller) in FIG. 45(A), it is displayed on the operation unit. .

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 device that supplies power to the control section. Reference numeral 110 denotes an input/output port that outputs display data to the operation display section 111 and reads data on each operation switch. Reference numeral 112 denotes an input port for reading input data from each detector 113 in the print control section 100. 116 is a motor, high voltage power lamp, solenoid,
Drive elements such as fans and heaters are shown. 115 is a drive circuit for the drive element 116; 114 is a drive circuit for the drive circuit 1;
This is an output port that provides an output signal to 15. 312 is a laser scan motor for operating the laser beam, 118 is a drive circuit thereof, and 117 is an input/output port that provides 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 synchronization pulse; 119 is a high-speed comparator for digitizing the analog signal from the beam detector; This is a print data write control circuit that controls writing to the test pattern 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 various detectors 11 in Figure 13.
FIG. 3 is a detailed circuit diagram of No. 3. In FIG. 14, signals from various detectors are input to a multiplexer 139. In the multiplexer, an 8-bit signal S32 is inputted to the input port 112 in FIG. 13 by a select signal S31.

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. In this sensor, 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 located on the paper ejection tray section. Reference numeral 125 indicates a toner out detection switch for detecting the absence of toner in the toner box, and 126 indicates a toner full detection switch which operates when the toner bag is full of toner.

Reference numeral 127 is a sensor for detecting the specific toner concentration of the developer (probe concentration detection sensor), and a photodiode 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 point to the comparator 128, since the reference voltage vref2 is applied to the other input terminal of the comparator 128, a signal of 1 or O is obtained when the toner concentration is above or below the specified value, respectively.

129 is 0N10FF by opening and closing the front cover.
130 is a temperature fuse provided in the fixing device, 131 is a door switch that turns the drive power (+24VB) to 0.
This is an MC relay that turns N10FF. Since one of the temperature fuses 130 is connected to the power supply +24VA,
When 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.
F is given. Further, the temperature fuse 130 is connected to a resistor RO1, and one end of the resistor RO1 is connected to a resistor RO2 and an input of a comparator 132. Further, a reference voltage Vref3 is applied to the other input of the comparator 132. Therefore, when temperature fuse 130 blows, the input of comparator 132 becomes ov. Therefore, the comparator 132 outputs a temperature fuse blowout detection signal. Reference numeral 133 denotes a destination selector switch. Specifically, this switch is set to 0N10FF, so that the ON state is for domestic destinations (A and B sizes), and the OFF state is for U.S. destinations (legal and letter size). Therefore, for example, even if the code combinations of the upper or lower cassette size switches (4 pieces) are the same, depending on the state of this switch,
Select one of the paper sizes for the US.

134 is a jam reset switch and is installed inside the front cover. This switch is a switch that is turned ON for confirmation after the operator calls for a paper jam or full toner, after the operator clears the jam or replaces the toner bag. Therefore, unless this switch is turned ON after the above processing, the jam or full toner display on the operation panel will not be cleared. Reference numeral 392 is a paper discharge tray sensor for detecting paper in the tray shown in FIG. A thermistor 334 detects the temperature of the fixing device, and the temperature detected by this thermistor is controlled to be constant. Thermistor 33
4 output is resistor RO3 and comparator 136.1'37
connected to the input side of the 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
At the connection point of O7.

A resistor RO8 is connected to one side of the transistor 1.
It is connected to 38 collectors. Therefore, when this transistor 138 is turned on by the input signal (power save signal) 83, the reference voltage of the comparator 136 is lowered by the resistor RO8, and the temperature control of the fuser is lower than when the transistor 138 is turned off. Become.

Therefore, the power consumption of the fixing device becomes low and the fixing device enters a power save state. Also, the reference voltage of the comparator 137 is the resistor R
It is given by the partial pressure of O4 and RO5. The reference voltage of this comparator 137 is the same as that of the comparator 136.
Since the reference voltage is set considerably lower than the reference voltage, it is possible to detect a temperature drop in the fixing unit due to heater disconnection or failure of the heater drive circuit during printer operation.

The output 833 of the comparator 136 is input to a multiplexer 139 and read by the 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 density 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 temperature of the photoreceptor 301 is low, and a high voltage when the temperature is high. operational amplifier 2
70 is a porty shifter, and its output is
It 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, which will be described later. 440
441 is a cassette/manual feeding adjustment switch, and 442 is a top margin adjustment switch. These various adjustment switches are installed inside the device, and service personnel must open the aircraft to operate them. Each of these switches has a plurality of setting sections. That is, the cassette upper/lower adjustment switch 440 has a plurality of setting sections corresponding to the positional deviation of the lower cassette with respect to the center position of the upper cassette as a reference, and the cassette/manual feed adjustment switch 441 also has the position of the upper cassette as a reference. The 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 change type (1 bit) in the top margin adjustment switch is determined by the number of pulses that is an integral multiple of the output pulse 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 printing state when performing a test mode.

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 is 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, which is a PLL like the developer and fuser driver described above.
Speed control is not performed, 147 is the photosensitive drum 30
1 drive motor, and uses a 4-phase pulse motor. 146 is a driver for the drum motor 147, which employs a constant current 1-2 phase excitation force type. The speed is approximately 1200 PPS, which is the speed at which vibrations are less likely to occur. A registration motor 149 is a pulse motor that drives the registration roller 329 and the manual feed roller 327. 148 is a driver for the registration motor, which uses a constant voltage two-phase excitation system. The speed is 40
It is about 0 PPS.

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.

151 is a lower paper feed roller 322 and an upper paper feed roller 3
The paper feed motor that drives 18 is a pulse motor. 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 LEDs. 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 in front of the transfer charger to increase transfer efficiency, and a plurality of red L E
It is composed of D. 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 30
1 is pressed against the blade 310. 154 is a driver for the blade solenoid 158. 159 is a 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 toner. The operation of the toner replenishing motor 159 is based on the output of the prologue 11 degree detection sensor shown in FIG. 14. 155 is the toner replenishment mode 1
59 driver. 131 is an MC relay that works in conjunction with the door switch similar to that shown in FIG. 14, and 15
6 is its driver. As shown in FIG. 15, the common on the power supply side of the motor, lamp, etc. without the MC relay 131 is connected to the contact 163 of the MC relay 131, and the other contact is connected to the +24V'B power supply. The motor and lamp can be operated when the relay 131 is turned on.

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

The corona discharge wire of the charger is connected to the high voltage power supply 338.
is connected to the output terminal of the charging high voltage power supply 160,
An 0N10FF signal line S35 for high voltage output and an analog control signal line 836 for changing the high voltage output current are connected to the input of the high voltage power source for charging. Further, the analog control signal line S36 is connected to the D/A converter 165,
The data on the charging voltage control data line S37 from the microprocessor 101 is converted into an analog voltage by the D/A converter 165 to control the output current of the charging high voltage power source. 306 is a peeler charger, and the peeler charger 306 is connected to the output of the high voltage power source 161 for peeler. 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 3.1 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 high-voltage transfer power source also incorporates a developer bias power source, and its output line 838 is connected to the developer magnet roller 308. This voltage applies a bias voltage to the magnet row 5308 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 MC relay 131, and the other end is connected to the heater drive circuit 166. Therefore, the heater lamp 333 is connected to the MC relay 1.
It operates only when 31 is ON. Also, heater drive circuit 1
Two input signals 833 and 839 are input to 66, and S33 is the thermistor 33 in the fixing device shown in FIG.
This signal is a density control signal for the fixing device. S
39 is a forced OFF signal for the heater lamp 333 of the microprocessor-101.

Figure 16 shows the laser scan motor 3 in Figure 113.
12 and its driving circuit 118. FIG. 16th
In the figure, 312 is a circuit diagram inside the laser scan motor. 102. LO3' and LO4 represent motor coils, and 180, 181, and 182 are Hall elements that detect the position of the motor rotor, respectively. 1.83,
184, 185 are the ball elements 180, 181, 18
2, and its output is the drive circuit 118.
The bases of power transistors 171, 172 and 173 which drive the motiles LO2, LO3 and LO4 are connected through resistors R26, R27 and R28. In addition, the power transistors 171, 172.17
Between the base and emitter of 3 is a base resistor R23,
R24 and R25 are connected respectively. As the rotor of the motor rotates, the Hall elements 180, 181, 1
82 turns on in the order of 180, 181, and 182.

Therefore, the outputs of comparators 183, 184, and 185 are also 1.
The level becomes LOW in the order of 83, 184, and 185. Therefore, power transistors 173, 172, and 171 are turned on in this order, and drive voltages are applied in this order to LO2, LO3, and LO4, thereby causing the laser scan motor 312 to rotate. Further, the output of the comparator 185 is input to the frequency division counter 175 through a waveform shaping circuit including a resistor R30, a capacitor CO6, and an inverter 174 through a diode DO2. The outputs of the output terminals Q1 and Q2 of the frequency dividing counter 175 are the outputs of the motor speed switching gate 1.
76.17'7, 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. Further, one input of the speed switching gate 176177 is connected to the output of the speed control signal line S40 and its inverted output. Therefore, when S40 is at a LOW level, the switching gate 177 is enabled and the output of the frequency dividing counter Ql is inputted to the FG of the PLL control IC 167, and when S40 is at a HIGH level, the switching gate 177 is enabled.
76 becomes valid, and the output of frequency division counter 175Q2 becomes PL.
The FG large input of the L control IC 167 is input. PL here
To briefly explain the input/output signals of the L control IC167, the P/S terminal (PLAY/5TOP) is HIGH.
/ Stops at the bell and starts at the LOW level.

In the case of HIGH level, the common power of both terminals of AGC and ΔPC becomes HIGH level. FGIN is the rotation motor pulse signal input from the motor to be controlled.

Nl, N2 are signals for switching the frequency division number of the reference frequency divider inside this IC, 33/45 is a switching signal for the motor rotation speed, CPO
UT is a crystal reference frequency division output signal, CPIN is a reference frequency input, and 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 the output of the motor speed control system, and the output of the 8-bit D/A converter inside PLL rC, A
PC is the output of the motor phase control system and is the output of the 8-bit D/A converter inside the PLLIC. Also PLLIC16
XOl connected to 7 is a crystal oscillator for generating a reference frequency, and COl and CO2 are oscillation capacitors.

Pl+- control IC167 (7) AFC, APC (7)
The output terminal constitutes an adder circuit with resistors R12 and R13, and is connected to one side input terminal of an operational amplifier 168. +12V is connected to the + side input terminal of the operational amplifier 168 through the resistor R14.
A voltage divided by and R15 is applied. Also, the resistance R
16 and capacitor CO3 constitute a negative feedback circuit,
In particular, 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. The output of the operational amplifier 168 is connected to the ten input terminals of the pulse width modulation type switching regulator ICs 16 and 9.

169 is a commercially available pulse width modulation type switching regulator IC. This IC 169 and power transistor 170. Diode Do 1, ml Il-01
, and a down-switching regulator circuit. In the input/output of IC169, one terminal is a comparison reference voltage terminal, and the voltage of reference voltage output terminal VREF inside IC169 is connected to resistors R17 and R18.
A reference voltage divided by is applied. DEADT I
The ME terminal regulates the maximum pulse width of the output, and is applied with a voltage obtained by dividing the voltage vREF by resistors R1, 9, and R20 IC. C1 and C2 are output terminals,
The pulse width changes depending on the voltage value of the input terminal. That is, when the + side input terminal voltage is lower than the one side input terminal voltage, the path width of C1 and C2 on the LOW level side becomes small, and the width in which the power transistor 170 is turned on also becomes small.

Therefore, the voltage across the capacitor CO5 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 width of C1 and C2 becomes large, and the voltage across the capacitor CO5 also becomes large.

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

When the rotation start signal 842 of the scan motor 312 becomes Low level, the AFC of the PLL control tII IC 167,
Since the 100 output of APC is at LO and W level until the above-mentioned lock signal S41 is output, operational amplifier 1
The output of 68 is a voltage of )-11'Gl-Levels. Therefore, the output pulse width of regulator IC 169 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 motor rotor is stopped, the motor coils LO2, L0
3. The Hall elements 180, 181.18 of LO4
The coil corresponding to No. 2 is excited, and the scan motor 312 starts rotating. The scan motor 312 then speeds up its rotation. The level of the speed control signal line 840 is now HI
Since it is GH, the Q2 output of the frequency division counter 175 is applied to the FG input terminal of the PLI-control IC 167. Therefore, the frequency division counter 175 functions as an 8 frequency division circuit. The frequency of the signal applied to FGIN is P[LI
When reaching approximately 96% of the reference frequency inside C169, the lock signal LD S41 becomes HI G )-1 and AFC, A
The PC output level is not fixed to LOW level (OV), but P
Switched to the output voltage of the LLIC 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.

Further, in this embodiment, when a print command is not received from the data control unit 2 for a certain period of time (approximately 5 minutes), the scan motor enters a standby state and the output of the speed control line 840 is 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 6000 during standby
It is rpn+.

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 becomes ON state. When a LOW level voltage is applied to the gate (G), the resistance becomes high and turns off. The output power from the laser 259 has three levels in this laser printer. First, by turning on the analog switch 254 with the output P (ON) to almost completely remove the electrical charges on the photoreceptor 301 in a portion corresponding to the white background on the paper, the laser diode 259 outputs the output P (ON). It becomes 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 electrical charge on the top as it is, the analog switch 25
By turning on the laser diode 259, the output of the laser diode 259 is turned off, that is, the output becomes P (OFF). The third is the first output P (ON) and the second output P (OFF) 17) li
t(7) This is to increase the printing density of one dot line with the output P('SH), and by turning on the analog switch 255, the laser diode 259 becomes the output P(SH) (P (SH) Details will be discussed 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 249, 25
The input resistance is 0.251.

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 input of the inverter 253 is connected to the print data signal 547 (printing at HIGH level, no printing at LOW level). The second is inverter 25
The input of the inverter 252 is connected to the output of the inverter 252, and the shadow signal S48 (shadow on at HIGH level,
(OFF when set to LOW). The third is connected to a laser enable signal 549 (laser enable at HIGH level, laser forced OFF at LOW level).

Therefore, the condition that the output of the NAj'JD gate 246 becomes LOW level is that the laser enable signal S49 is HIGH.
rGl-1, the shadow signal S48 is LOW, and the print data signal S47 is LOW. Next, 247 is 3NA
All three gate inputs are HIG'l- in the ND gate.
When the level is reached, the output becomes LOW level, the analog switch 255 is turned on, and the laser diode 2
59 is in the output P (SH) state. The first of the three input gates is connected to the shadow signal S48, and the second is connected to the inverter 25, which is the inverted signal of the print data signal S47.
3, the third is the laser enable signal S49
are connected to each. Therefore, the conditions for the output of the NAND gate 247 to be LOW are that the laser enable signal S4'9 is HIGH and the shadow signal 348 is HIGH.
is HIGH and the print data signal S47 is LOW. Next, 248 is a 2OR gate, and when one of the two gate inputs becomes LOW level, the output becomes LOW level, and the analog switch 2
56 is turned on, and the laser diode 259 becomes an OFF state output P (OFF) 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 an analog voltage input to be sampled, SAMPLEC is a connection terminal for a hold capacitor CO8, and 5TROBE is a sampling strobe signal terminal, which is connected to a sample strobe signal S46. 237 is an operational amplifier with FET input, which constitutes a voltage follower circuit. DO3 is a Zener diode that regulates the output of laser diode 259 to be within the maximum rating. Further, the resistor R40 and the capacitor CO7 constitute an integrating circuit, and the resistor R41 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 a buffer 244, and the sample signal $45 is input to the input of the buffer 244. 253 is a transistor for level conversion, and R39 acts as a current limiting resistor 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 234 through the resistor R34. 232 is an amplifier for the output of the photodiode 260 that detects the optical output from the laser diode 259, and serves as current-voltage conversion means. Resistor R32°R33, VROI is the operational amplifier 23
This is a resistor that regulates the degree of amplification. Therefore, the volume V
By changing RO1, 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. Optical output P of photodiode 260
The relationship between short circuit current (S) and O is shown in FIG. 1st
In FIG. 9, is indicates the monitor current, and PO indicates the optical output of the laser diode 259. The output of P(ON> is about 6II1w, the output of P(SH) is about 4mw, P(
OFF) is set to 0. Further, LA-A and LA-8 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 6111W. Therefore, the characteristics of both graphs LA-A and LA-B in FIG. 19 can be adjusted by the volume 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 2.OV 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. A voltage is input to the input terminal of the voltage follower 239 after being divided by a main exposure adjustment volume 360, which is a first voltage variable means, and a resistor R45. The voltage at one side of the terminal also changes. Further, the analog switch 241 is turned on when the laser output P (SH) is set, and the voltage obtained by dividing the output voltage of the voltage follower 239 by the resistor R46 and the shadow exposure adjustment volume 361 which is the second voltage variable means is set to the above voltage. It is applied to one side input terminal of the comparator 234. The above voltage follower 239,
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 reference value is referred to as an optical output stabilizing means.

The analog switches 240 and 241 are switched by the main exposure setting signal S44. That is, when the main exposure setting signal S44 is at the LOW level, the output level of the inverter 242 becomes HIG)-level, and the analog switch 241 is turned on. Further, when the main exposure setting signal S44 is at the HI'GH level, the output of the buffer 1243 becomes at the HIGH level and the analog switch 240 is turned on. The outputs (S side) of the analog switches 240 and 241 are also input to the voltage follower 261, and the output 8 of the voltage follower 261 is used to correct the threshold level of the horizontal synchronous pulse detection comparator of the beam detection circuit, which will be described later.
50 is used.

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 temperature of laser diode 344 is 0℃,
Same < TC=25℃, when case concentration is 25℃, TC=50
°C is the IF-Po characteristic when the case temperature is 50 °C. Taking the characteristic 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 a point of about 50 mA. Then, at the point of IF=68mA, the P(ON
) is the optical output of 6 mw.

Therefore, even when TC=O°C, the optical output Po starts to be output at a point of about 401 A, so by turning on the transistor 258, the bias current IFB is always maintained when the laser enable signal S49 is at a HIGH level. The power loss of the laser modulation 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 value should be lF25 - IFB.Compared to directly driving the current of lF25 with the transistor 257, the light intensity stabilization described later is The accuracy of the operation can be considerably improved. 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. The laser beam stabilizing circuit detects the amount of light from the laser diode 259 with a monitor photodiode 260, and is controlled so that the short circuit current 1s of the photodiode 260 is always a constant amount. This is because, as is clear from FIG. 19, the monitor short-circuit current IS and the optical output po of the laser diode 259 are in a perfect proportional relationship.
If s is kept constant, the optical output po is always kept constant. Furthermore, the temperature-related drift of the photodiode 260 is very small, so even if the temperature changes, the amount of change in optical output can be ignored. Next, the 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 $49 and the sample signal S45 both go to HIGH level, the first
The transistor 258 in Fig. 7 is turned on, and a bias current (approximately 3
0mA) flows.

Also, at this time, since both the print data signal 847 and the shadow signal S48 are at LOW level, the gate 2
Among the analog switches 254, 247, and 248, the inputs of only the gate 246 are all at HIGH level, so the output becomes LOW level, and the analog switch 254 among the analog switches 254, 255, and 256 is turned on. Further, the analog switch 236 is turned on when the sample signal S45 becomes HIGH. At this time, capacitor C is still
Since O7 is in an uncharged state, the output of the operational amplifier 237 is OV, and the base of the laser modulation transistor 257 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 (S is O, and the output of the operational amplifier 232 is OV, so the output of the comparator 234 becomes LOW level and the transistor 235 is in the OFF state.

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. Moreover, if it is too large, the responsiveness will deteriorate and it will take time for the optical output to stabilize. As the capacitor CO7 is charged, the output voltage of the voltage follower 237 also gradually increases. Therefore, as the base voltage of laser modulation transistor 257 increases, current flows through the collector. At this time, the collector current IC of the transistor 257 has a current value of (VB-VBE(SAT))/R50. A summation current IF of the bias current IFB from the transistor 258 and the current (C) from the transistor 257 flows through the laser diode 259. Then, the current Jc increases, and the current (C) of the laser diode 259 increases.
t') - current IF is approximately 50mA (TO=25℃)
When the laser diode 259 reaches this point, the laser 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 input terminal of the operational amplifier 232 increases by 2, and its output voltage also amplifies the input voltage. The value is output. The amplification degree of the operational amplifier 232 is adjusted in advance by Polycomb VRO1 so that the output voltage of the operational amplifier 232 is approximately 0.5V relative to the output imw of the laser diode 259, so the optical output of the laser diode 259 increases to approximately 2 mw. ,
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 LOW to HIGH level. Since the main exposure setting signal 844 is at the LOW level, a shadow exposure level (light output P(SH)) voltage is applied to one side input terminal of the comparator 234 through the analog switch 241. 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, the voltage corresponding to the average value of 4 mw of optical output is 2. O
Suppose that V. Therefore, the optical output of the laser diode 259 increases, and the voltage at the input terminal of the comparator 234 increases to 2.
．． When the voltage exceeds 0■, the transistor 235 turns on.
Capacitor CO7 is discharged through resistor R40. Therefore, the base voltage of the laser modulation transistor 257 also decreases, and the optical output of the laser diode 259 becomes 4 mW or less. When the optical output of the laser diode 259 becomes 4 mW or less, the + side input terminal voltage of the comparator 234 also becomes 2.0 V or less, and the transistor 235
turns off.

Then, the capacitor CO7 is charged up again through the resistors R39 and R40. Then, the laser diode 259 again changes its optical output around 4n+w, causing the comparator 234 to repeat the 0N10FF operation at a constant cycle. Note that since this comparator 234 has a hysteresis characteristic, comparative judgments are stabilized and reliable judgments can be made. And the resistance R
39 and R40, the capacitor CO7
The voltage across the terminal approaches the value of VOl in FIG. 20 and becomes stable.

After the laser ready signal S43 becomes HIGH 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 IC 245
The voltage VO1 (FIG. 20) of the capacitor CO7 input to the N A l-OG-INPUT input terminal is sampled and held, and the voltage is stored in the hold capacitor CO8. Therefore, the sample strobe signal is
After the output of the sample and hold IC, the control voltage VO1 for outputting the shadow level P (SH) continues to be outputted to the output OUT of the sample and hold IC.

Next, when the sample bold operation of the shadow level P(SH) is completed, the microprocessor 101 switches the main exposure setting signal S44 to the HIGH level through the output port. Therefore, the output voltage of the voltage follower 239 is applied to one input terminal of the comparator 234 through the analog switch 2.40. The output of the voltage follower 239 has the main exposure level (light output P (ON
)) Voltage is being output. This voltage is set by the main exposure setting volume 360 in the operation unit according to the sensitivity characteristics of the photoreceptor 301, and currently the average value is 3.0cm, which corresponds to a light output of 5mW. Assume that it has been output. Therefore, the output of the comparator 234 has one side input terminal as 3. LO due to switching to OV
The voltage becomes W level, and the transistor 235 is turned off. Therefore, as the capacitor CO7 is further charged up, the base voltage of the laser modulation transistor also increases, and the optical output of the laser diode 259 also increases. When the optical output of the laser diode 259 becomes around 6 mW, the output voltage V232 of the operational amplifier 232 becomes about 3V. When the output voltage of the operational amplifier 232 becomes 3V or higher, the output of the comparator 234 changes to HI G +-1, turning on the transistor 235 and discharging the capacitor CO7 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 5 mW or less. When the optical output of the laser diode 259 becomes 5 mW or less, the voltage at the + side input terminal of the comparator 234 also becomes 3.0 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, and the optical output of the laser diode 259 is 5mW.
That's all.

In this way, the optical output of the laser diode 259 is 6+nw
The comparator 234 repeats the 0N10FF operation at a constant cycle around the vicinity. And the resistors R39 and R4
Due to the integral effect due to 0, the voltage of capacitor CO7 becomes
Figure 0 approaches VO2 and stabilizes. When the setting of the main exposure level is completed, the microprocessor 101 starts the operation of a sampling timer, which will be described later, and writes print data to 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 outputs the sampling signal 845 only in a portion other than the print data write operation, that is, in the period shown in FIG. 20a. Since the sample signal S45 is at the LOW level in the section of the print data S47 and the shadow data 848, the analog switch 236 is turned off. Therefore, the laser diode 259 is activated by the print data D47 and the shadow signal 848.
is the laser diode 25 in the modulated region Ef).
As mentioned above, the optical output level of No. 9 is P (ON), P
(SH), P (OFF) (7) There are three (7) levels. That is, first, the print data signal S47 is OFF, that is, LOW level, and the shadow signal is OFF, that is, LOW level.
In the case of OW level (white output for printing), NAND gate 246 is established and analog switch 254 is activated.
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 P(ON>=6 mw.Secondly, the print data signal S47 is turned off, and the shadow signal is ON (the printing output is halftone), the NAND gate 247 is established, only the analog switch 255 is ON, and the modulation transistor 257 is turned on.
The output voltage VO'l of the sample and hold IC 245 is applied to the base of the laser diode 259, 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 (S H). 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, the capacitor CO7 is discharged, and VC○7 becomes smaller. In order 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 ΔT during the second printing operation. As is clear from the characteristic diagram in Figure 18, as the case temperature increases, 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. It's gone. 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 sample strobe signal 84
6, the shadow exposure level P (ON) is set in the sample and hold IC 245. At this time as well, the operation corresponds to the rise in the case temperature of the laser diode 344, and the voltage of the capacitor CO7 is increased by the correction voltage △V2 due to the rise in temperature. VO4 is set, and after setting, printing is performed on the second cylinder.In this way, the shadow exposure level P(S)I) and the main exposure level P(ON) are set.
is held at a constant level very precisely by the function of a stabilizing circuit, making it possible to perform high quality printing. Incidentally, as described above, the main exposure level P (ON) performs a light amount stabilizing operation so that the light output is always kept constant except when printing data is being written. Furthermore, for the shadow exposure level, a sample hold operation is performed before each print starts, and unlike the main exposure level, a light amount stabilization operation is not performed during the print writing operation. This is because the circuit becomes complicated and expensive, and the shadow level is an auxiliary element compared to the fluctuation of the main exposure level, so even if it fluctuates a little, it does not have much effect on the print quality. In addition, when changing the setting voltage input to the comparator 234 according to the sensitivity characteristics of the photoreceptor 201, the adjustment is made by changing the main exposure setting volume 360. This main exposure setting volume 360 is adapted to vary the input voltage of the voltage follower 239. Therefore, by varying the 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 the time of P (SH) is obtained by dividing the output voltage of the Poldage follower 239 by the resistor R46 and the shadow exposure setting volume 361. Therefore, when adjusting the main exposure setting volume 360 (P (ON) R, P (SH)) (7), the light output setting voltage changes proportionally, and there is a constant relationship between the recording density and the applied voltage. can be kept. Therefore, the adjustment becomes simple without requiring the complicated operation of varying and adjusting the set voltages at 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.
The pulse width and pulse generation position must be extremely 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 anode side of the beam detector 346 is connected through a load resistor R52 and a resistor R55 to one side input terminal of a high-speed comparator 262, which is a comparison means. In addition, the + side input terminal of the comparator 262 has resistors R53 and R5.
A voltage divided by 4 is applied through the 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. In addition, a diode D4 is connected to the + side input of the comparator 262.
Threshold variable voltage 8 through 0° resistor R57
50 is applied. This threshold variable voltage 8
50 is the output of the analog switch 240 or the analog switch 241 (output of the optical output setting means) (see FIG. 17). FIG. 22 shows the relationship between the one-side 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 relationship between the output waveform of the comparator 262 at that time. When the beam passes over the beam detector 346 at high speed, a pulse current flows from the beam detector (PIN diode) to one side input terminal of the comparator 262 as shown in FIG.
, b are input. If the voltage at the + side input terminal of the comparator 262 is always a low voltage VO6 because the threshold variable voltage S50 is not applied, the output waveform of the comparator 262 is a waveform a.
In the case of , the output waveform is as shown by the dotted line, and in the case of waveform , the output waveform is as shown by the solid line. Here, the waveform a represents a waveform when the sensitivity of the photoreceptor 301 is low and the laser output during the main exposure is 6 mW or more, whereas the waveform a represents a waveform when the sensitivity of the photoreceptor 301 is high and the laser output is 6n+w 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 threshold variable voltage 850 and correcting the laser beam so that when the light intensity is large, the voltage is VO5, and when it is small, the voltage is VO6, the output waveform can be approximately adjusted as shown in Figure 22. It can be kept constant.

FIGS. 23(A) and 23(B) show the beam detector ('P
346 is a configuration diagram of an IN diode (IN diode) 346. Figure 23 (
In A) and (B), 410 is a light receiving element, 411 is an electrode wire, 412 is a mask plate, 413 is a laser scanning beam,
414 is a light receiving element mounting base, and 415 is an output lead wire. The PIN diode used in this example has a light-receiving element shape of 2, 5 x 2, 5 mm, and a response time of 4 n5ec.

The laser beam 413 is scanned at a constant speed by the rotation of the polygon mirror 313 in the direction of the arrow in FIG. At this time, the input waveform of the one side input terminal of the comparator 262 in FIG. 21 becomes the waveform shown in FIG. 24. In FIG. Noise is generated before and after the output waveform in the waveform when there is no noise.This is because the light receiving element 410 itself is originally used to detect stationary light or to detect light at a very slow speed even when it is being scanned. This is mainly aimed at cases where the light-receiving element 410 has an end face with poor parallelism, and when the laser beam passes through that end face, the output current becomes unstable.Therefore, these problems occur. In order to solve this problem, a mask 412 that does not allow the laser beam 413 to pass is attached on the light receiving surface of the light receiving element 410 to prevent output waveform cracking when the beam passes on the end surface.The mask 412
For example, as shown in FIGS. 23(A) and 23(B), the light receiving element 410
The laser beam 413 has a structure in which a square window is opened in the end face part and the part not including the electrode wire 411 lead-out part.
The light is made to hit 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 in FIG. 13. The main functions of this print data write control circuit 119 are as follows:
In order to write the print data S57 from 2 to a predetermined area on the photoreceptor 301 according to the size of the paper to be printed, the parallel print data S57 is serially converted and sent to the laser modulation circuit 120. In addition, the print data S
A shadow signal for improving print quality is generated from the data contents of 57 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 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, 186 is 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;
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 the reference clock for the image clock pulse and has an oscillation frequency of approximately 32M.
It is Hz. 190 is a circuit for generating an image clock, which generates a pulse (approximately 8 MHz) corresponding to one dot, the minimum modulation unit of a laser beam. 191 is a control counter for serially converting print data in bytes (8 bits) received from the interface circuit; 192 is a circuit for generating test patterns used during maintenance (
When this circuit is selected, a test print is performed and the various adjustment switches described above are adjusted.) 211 is a multiplexer for selecting test pattern data and print data from the interface circuit 122; 210 is the multiplexer 211; Shift registers 213 and 214 convert 8-bit parallel data from
212 is a line memory that temporarily stores print data and has a memory capacity of 4096 bits.
An address counter 215 for 13.degree. 214 is a decoder for generating a signal for controlling the test pattern generation circuit. 226, 227, and 228 are seven lip-flops for synchronizing the timing of sending print data and shadow data.

Here, the details of the counters 187 and 188 will be explained. A counter 275 determines the timing for correcting the amount of laser light for each line (horizontal scanning line), counts based on the reference clock signal S53, and generates a sample signal 875 used for correcting the amount of light and starting the line. 276 is a counter for determining the horizontal recording start position, which is counted based on the Q7 output (video first dot unit signal) S83 from the control counter 191 and outputs a horizontal recording start position (left margin) signal 884. A counter 277 determines the recording end position in the horizontal direction, and counts based on the bidet eighth dot unit signal S83, and outputs a data write end position (write margin) signal 885. 278 is a counter for positioning the start of recording in the vertical direction, and counts based on the output of the gate 198 which uses the paper leading edge position (page top) signal S74 outputted from the input/output port 186 and the Q output of the flip-flop 204. and generates a page top count output 876.

Numeral 279 is a vertical recording end positioning counter which counts based on the output of gate 198 as described above and outputs a page end count signal 877. 280
A vertical test pattern control counter performs counting based on the Q output of the flip 70 knob 240 and outputs a test pattern control signal S79.

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 status data and ready status signals of the print control unit to the data control unit 2; 264 is an 8-bit latch for both command and print data.

265 is a transceiver/receiver for the interface data bus S59. 266 is a decoder for the data selection signal S60 that specifies data on the data bus 859, and 269 is a BUSY signal control circuit that controls the data sending timing to the data control section 2 when receiving command data and print data.

Next, details of the interface signal will be explained. In FIG. 26, 859 is a bidirectional 8-bit data bus, and S60 is a data selection signal on the data bus 859.
Data on the data bus 859 is selected by a combination of two signals C0M and ID5TA. S61 is IPRDY
A signal indicating that the print control unit 100 is in a ready state.

862 is IPREQ, a signal that allows the data control unit 2 to send the print start signal IPRNT, and S63 is the IP
At END, the data control section 2 receives this signal and stops sending out the print data.

S64 is IH3YN, which is a request signal to send one line of print data, S65 is IPRNT, which is a print start command signal, S3
0 is a strobe signal for commands and print data, abbreviated as l.
5TB, S66 is IBSY and the strobe signal S30
This is a signal that permits transmission of the status data and permission for the data control unit 2 to read the status data.

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. Data on output line 872 is transferred to data latch 264 by strobe signal S30.
is 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 from an output line 859 to the print data write control circuit. Also, the data for the stay change is sent out 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 371 of the input/output port 263. The set status data S71 is input to the transceiver/receiver 265. The input data is output onto the data bus S59 when the status identification signal 868 is ON.

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.

P'SON is a power save command that reduces the power consumption of the fuser 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 fuser 331 to save power. In addition, during recording, the power can be increased to the normal value using the power save release command PSOF to fix the toner. C3TU feeds paper from the upper stage of the cassette.

The specified command, C3TL, is also the lower specified command, V
SYNC is a command that instructs the data control unit 2 to start sending print data, MF1 to 9 are manual feed mode specification commands, 78M1 to 4 are top/bottom margin specification commands that specify the printing start position on paper, and SOF is a shadow The commands for forcibly turning off exposure are shown below.

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 VSYNC request status indicates that the print control unit 100 has received a command to start printing and is now ready to receive print data, and the manual feed status indicates that the paper feed mode is manual feed mode. The status to notify, upper/lower cassette is the status indicating the status of the selected cassette in the cassette feeding mode, and top/bottom margin is the status of the top/bottom margin selected by the top/bottom margin commands (78M1 to 78M4). status, cassette size (
The status (upper row) and cassette size (lower row) indicate the size code of the attached cassette, the test/maintenance status indicates that the test/maintenance status is in progress, and the data resend request indicates that reprinting is required due to a jam, etc. The status indicates that the printer is in a warm-up state of the fixing unit during wait, and the status indicates that the printer is in a power save mode by the power save command (PSON) during power save. Operator call indicates that an operator call factor of status 4 has occurred. Serviceman call indicates that a serviceman call factor of status 5 has occurred. Tray full indicates that there are more than a specified number of sheets in the paper output tray and the tray is full. Toner pack 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. The cover opening does not indicate that the front door 1~ is not closed. A timing error indicates that there was a problem in transferring print data. The fixing device failure indicates that there is an abnormality in the fixing device, such as a heater disconnection in the fixing device or a temperature FtJSE failure. 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. The scan motor failure indicates that the scan motor does not reach the specified rotation speed even after a certain period of time has elapsed since startup, or that the scan motor deviates from the specified rotation speed for some reason after reaching the specified rotation speed.

Heat roller replacement indicates that the fuser roller counter shown in FIG. 15 has reached a specified value and that 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 also 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 to the next surface from the beam scanning starting point 416 at time O by the next surface of the polygon mirror 313. Begin beam scanning. 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 represents the left end surface of a sheet of paper size A3, and 420 similarly represents the right end surface. 421 is the same A
The data writing start point 422 also indicates the data writing end point for the three sizes of paper.

423 is the left end surface of paper size 86, 424 is the right end surface, 425 is the data writing start point of the same size, 426
Similarly, each represents the data writing end point. Also 42
7 represents the center point of the paper.

d4 is the distance from the beam scan 418 to the A3 size writing start point, d5 is the same < distance to the A6 size writing start point, d6 is the same < distance to the A6 size writing end point 426, d7 is A3 size Each represents the distance to the writing end point. d8 represents the distance from the beam detection point 418 to the right end surface 420 of A3 size paper. Further, d3 represents the range of one scan of the beam. d14. d9. dlo indicates the effective printing range on A3 and 86, respectively.As is clear from this drawing, the paper feed of this printer is always centered around the paper center point 427, so the beam detector position 418 varies depending on the paper size. The starting points for printing data are different from each other, so the beam detector 346 detects the beam in accordance with the paper size and writes data after a period of time has elapsed corresponding to the distance from each writing starting point. Instead of performing such control, this printer does not use a paper edge feed mechanism, so it is possible to print on the entire surface of the paper.In this embodiment, the left and right margins on the left and right sides of the paper are Although it is set to 3mm, it is possible to set this to O.Also, for printers that use conventional edge feed conveyance, a margin of about 8 to 1Qmm is usually required.
The drawback is that a fairly 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 of paper, and 437 represents A3 sheets. 419,420°421.422,423,4
As for 24,425,426.427, the same positions as in FIG. 29 are shown. 430 represents the leading edge of the paper, 432 represents the data writing start point in the vertical direction of the paper, 431 represents the trailing edge of the A3 size paper, and 433 represents the end point of A3 size data writing. 434 represents the trailing edge of the paper of size 0, and 435 represents the end point of writing data of size 6.

Next, the operation of the component device will be explained with reference to the time charts of FIGS. 31 and 32.

Ready signal I PRDYO (S61
) becomes printable.

At the same time, the print start signal IPREQO (S62) becomes active. Next, the laser enable signal LDON1
(849) rises to "1". This signal 849 turns on the transistor 258 in FIG. 17. At this time, the data flip-flops 226 to 228 in FIG.
is not set, so both the print data signal S47 and the shadow signal S48 are 0'. Since the laser enable S49 is "1', the print data is O', and the shadow signal S48 is 0', the gate 24 in FIG.
6 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 operational amplifier 239 operates via the operational amplifier 232, and a laser ready signal LRDY1 (843) is generated. Next, in synchronization with the horizontal synchronization signal H8YO (S54), the counter 2
A sample signal SMPTO (375) is generated from 75. This signal S75 is used to set the time corresponding to the distance 111td3 (distance of one line) between 416 and 417 in FIG. 29 that defines the paper size. This allows the light amount to be corrected for each line and is used as a line start signal. That is, this signal 8
75 opens the gate 193 in FIG.
A sample signal @S45 is generated from 94, and this sample signal S45 turns on the analog switch 236 via the gate 244 in FIG. Light amount correction is performed. PTCTO (S76) is an output signal of a counter (page top counter) that determines the leading edge of the paper, and PEC,To (877) is an output signal of a counter (page end counter) that determines the end position of the paper. When the timing to write the image comes, the status of the VSYNC request is sent to the external device. Due to the stiffness, a VSYNC command is issued, and when it is received, PTOP (S73) is issued, and from that point, H8YNC is issued.
Start counting the number of lines. In the same way, specify how many lines to write from that position (end position). In order to make it possible to change this specified value, a top margin 920 and a holatum margin nE are provided. If the above specification is made, when VSYNC comes, P will appear before the leading edge of the paper.
A TOP signal is output. 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 Figure 25 determines where to write from this j: sea urchin.
It is. 5TO (378) is the output of 7 lips 70 tubes 204 for synchronization.
C 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 can be forcibly reset without being touched normally. Flip-flop 204 by reset
A Q output is generated, 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 clock from the oscillator 189 by four and outputs a bit-by-bit signal only while the line start signal LST is set. This output becomes two types of signals 382 and 387 with different phases. As a result, synchronization for -lines is achieved. V
DATI is a print data signal (S47), which is output as serial data by the operation of the P/S conversion shift register 210. That is, the P/S conversion shift register 210
is operated by the signal S82 from the clock generation circuit 190, but when the load signal is not applied, the output 886 is 0' (no laser writing), and when the load signal S88 is input, the output 886 is 0', and when the load signal S88 is input, the output 886 is 0'. Convert and output serially.

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, and the J counter that controls this is the left margin counter 276 in Figure 25.
(data is d9.d'10 in Figure 29) and write margin counter 277 (data is 611.d12 in Figure 29)
). In this case, the set defines the distance between the left and right sides based on the center of the paper. H3YN
When the LST signal (S78) is output in synchronization with the C signal, the control flop 196 is set, and the gate 19
8 sparkles and the counter 276 starts counting. In this case, the video clock is not counted bit by bit, but once every 8 bits. Assuming that the count output that comes out every 8 bits is set in accordance with the left margin N1m1 and the right margin NRm, counting is performed in synchronization with the ST multiplication signal 878). Then, it starts up after setting and outputting the count number. Therefore, the gate 201 determines the vertical direction, and the gate 199 determines the horizontal direction ('S), and writes to the point when both gate outputs become (1, 1).At this timing, The load signal is output, and the data S86 from the shift register 210 is serially converted and sent.

Line memory out signal LMOT (880) 4 and OR
This is the output of gate 222. This (maline memory 21
This is to control which data, 3 or 214, is to be sent. That is, this sending timing is controlled by the flip-flop 203. That is, this flip 70
The output state of the knob 203 changes every time a clock pulse is applied, and the gates 220 and 221 are opened alternately.
The outputs DOUT of are read out alternately. line memory 2
The writing timing to gates 13 and 214 is also the same as gate 217.
218 are opened alternately and controlled. 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, LDAONI (881) will be explained with reference to FIG. 43.

In this type of recording device, the laser is usually emitted over the entire axial direction of the photoreceptor 301 (in the case of 1), for example, a small size paper (such as B5 paper 458 shown in FIG. 43) is used.
In many cases, printing is only performed on paper (such as A4 or A4 paper), and as a result, toner and the like do not adhere to the area near both ends that are not used. Further, even for a large size paper (for example, paper 461 in FIG. 43), there is an unused area (the used area for small size paper 458 is also within the shaded area 459). If an area where toner does not adhere for a long period of time is created in this way, when the blade scrapes off the adhered toner after recording, the contact resistance of the blade in the unadhered area becomes large, causing scratches on the surface of the photoreceptor. There is a problem. So with this device. As shown in the time chart of Fig. 31, immediately after printing for one sheet of paper is completed, the line data on signal LDAON1 (881) is sent.
is generated, and the print data signal VDAT is generated within this generation period.
1 (S47), and by this operation, lines (images) 460 and 463 spanning the entire axial direction of the photoreceptor as shown in FIG. 43 are written after printing for one sheet of paper is completed. The above drawbacks have been eliminated. In this case, the timing for writing line data is the data LDA one step before the final stage data LDATn in the data of the line memory out signal LMOT1 (S80).
The signal is generated when a predetermined time tx has elapsed from the falling edge of Tn-1. Note that such lines are not necessarily drawn periodically after each sheet of paper has been printed, but are drawn on a lot-by-lot basis (for example, every 10 sheets or 10 sheets).
It may be set to be written every 0 sheets).

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

Determination as to whether or not to generate the shadow signal 348 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 70 knob 227 is in the horizontal direction (
The flip-flop 228 contributes to determining a shadow based on a change in level in the vertical direction (line direction), and to determining a shadow based on a change 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 70 knob 227, so for example, the current data is ', when the previous data is '1', the shadow signal S/48 is output. Similarly, the data of the previous line and the data of the current line are sent to the gate 223.
For example, when the data on the current line is '1' at the same horizontal position on the previous line, 7 is compared.
The lip-flop is set and a shadow signal is generated. Note that a shadow signal is also generated when both flip 70 tabs 227 and 228 are set. This state is represented by the shadow out signal 5OUT1 (S86), the print data signal VDAT1 (847), and the shadow signal 5DAT1 in FIG.
(848).

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 character "謹" is 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. For PAT2, the upper left area of the figure shows a characteristic diagram Q that does not show the relationship between the surface potential of the photoreceptor and the exposure energy, and the lower left area of the figure shows characteristic diagrams R1 and R2 that show the relationship between the exposure position and the surface potential. . 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 PAT1 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 larger. 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 a shadow part.
The energy is, for example, 4 mW.

The above shadow method can be summarized as follows.

In a device that records recorded information (surname information, etc.) on a recording photoreceptor by beam scanning in correspondence with differences in beam intensity, serial binary input data is transferred to beams having first and second intensities. Recording is performed based on the above-mentioned P (ON) and P (OFF)), and when the input data has a specific relationship, the first or second 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 of the intensity, and this specific relationship can be determined by, for example, <a> when beam scanning is performed sequentially for each horizontal line. It is determined that the binary data on the horizontal line changes from significant recorded data (data for forming characters) to unintentionally recorded data (data that does not contribute to character formation), and the unintentionally recorded data immediately after the change is detected. scanning the part with a beam of a third intensity; 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 that position, as in (a) above; 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 in FIG. 55 (A), the microprocessor determines whether or not the flow is a "shadow" flow. For other types of information (for example, image information), "Shadow" is not activated and is automatically performed. The command in this case is not shown in Figure 27. rsONF shadow 0N10F
It is FJ. , or on the panel [Shadow 0N1
An 0FFj switch may be provided so that the operator can arbitrarily select it.

If the above-described shadow method is used, if the recorded information is character information, it is possible to add a "shadow", thereby improving the print quality. Especially during high-density beam recording, the line [
Fading can be prevented, and as a result, the printing density of each dot to line is increased, so that the printing quality can be improved even for a high-dot Kanji font such as a 40×40 dot configuration. In addition, it is possible to widen the permissible range of vertical deflection of the beam on the photoreceptor due to one-plane deflection of the polygon mirror, making it easier to process polygon mirrors.
It also has the advantage of being cheaper.

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.
35, a voltage control circuit 445 whose operation is controlled by the voltage control circuit 445, a step-up transformer 446 which applies a frequency output to the primary side and generates a high-voltage output from the secondary side, and a step-up transformer 446 which rectifies the output of the step-up transformer 446. a high-voltage rectifier circuit 447 that applies a rectified output to the charger 304; a current/voltage conversion circuit 450 that inputs the current flowing to the charger 304 and converts it into a voltage;
The operational amplifier 449 has one input as the output of the 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 is controlled by an analog control signal 836 to output different control reference voltages. According to such a configuration, the output frequency of the voltage control circuit 445 is determined based on the output from the control reference voltage generation circuit 448, and a high voltage output is generated based on this, and the current of the next charging charger is Current/
The output voltage is applied to the voltage conversion circuit 450, and the output voltage and the reference voltage are compared by the operational amplifier 449, and the control operation 1r is performed so that the two match, so that 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 temperature changes.

In the figure, the horizontal axis represents temperature, and the vertical axis represents surface potential change △V○
This shows the type of drum: 451°452.45
Each type has different characteristics. Also, the 39th
The figure shows each drum 451, 452, 45 at a temperature of 25°C.
3 shows a characteristic diagram showing the relationship between the drum inflow current ID and the surface potential ■O, which is a proportional straight line. Therefore, in order to keep the surface potential constant, it is sufficient to change the drum inflow current ID. For example, in order to maintain a surface potential of 5oov for the drum with characteristic 451 in FIG. -Inflow current change amount △ID- corresponding to O
(Various characteristic data of the photoreceptor is stored in the RAM 107). Here, since the inflow current ID and the output current have a corresponding relationship as shown in FIG.
By changing 6 to 2V, 4V, and 6V, the inflow current ID can be adjusted. Figure 41 shows
Analog input current (D/A converter 165 in Figure 15)
For example, the temperature of the drum 301 can be detected by the temperature sensor 342 (thermistor in FIG. 14), and the analog control signal S36 can be applied in response to the temperature change. Bye.

The charging 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 DTn and the temperature 25
The value DAT is read by subtracting the drum temperature data DT25 when the temperature is °C. Next, the reference data DV at a temperature of 25℃
25 is read, DV25+DΔV is calculated, and the calculation result DVn is output to the D/A converter 165. Then, by referring to the RAM 107, the drum characteristic data at address r6000J shown in FIG.
o, and further read the feedback error data DΔ■. Next, read the reference data DV25 at a temperature of 25°C, calculate DV25+DΔV, and calculate the result DVn.
is output to the D/A converter 165. Then, Vn is applied to the analog input of the charging high voltage power supply 160 (S-3
6) together with the control input signal 835 of the high voltage power supply 160 for charging.
Turn on and perform correction. The above correction is repeated every time the temperature changes to keep the surface potential of the drum 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 NO 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 photoconductor is kept constant even if the temperature of the photoconductor changes due to changes in the external environment or temperature rise in the gas, so the charge potential based on temperature changes can be adjusted. It is possible to prevent problems such as blurring 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 an advantage that the range of specifications for the photoreceptor can be expanded.

Next, the flowcharts shown in FIGS. 47 to 56 and the flowcharts shown in FIGS.
The operation of the entire product will be explained with reference to the time charts shown in FIGS. 59 to 59. Here, each timer (counter) used in the following operation description will be defined.

Timer A is for so-called standby operation from the start of printing until outputting VSYN'C, and timer B is for VSYN'C.
It performs control from NC generation to data reception (pulling). Timers 〇 and D are used to control from the start of data transfer to registration motor stop, toner replenishment, etc., and timer E is used to complete data reception and control the stop sequence. It is.

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

Make sure that the paper ejection switch 336 is OFF, the manual stop switch 328 is OFF, the pass sensor 123 is OFF, the temperature fuse 130 is not disconnected, and the paper ejection tray 3 is turned off.
84 is confirmed to be full (FULL), 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 will turn on, and the fuser heater lamp 333 will turn on.
ON, the scan motor 312 turns ON and timer A (
TIMA) starts. When the timer ATrMA counts 1 for a predetermined period of time, mechanical parts such as the drum motor and developer motor turn on, and then TIMA counts for a predetermined period of time t.
When counting 2, the laser 344 is turned on. T [
When time [25] is counted by MA, it is determined whether the laser is ready or not, and if it is yes (Y), then TIM
When A=t26 is timed, the transfer chiller, laser, developer motor, and developing sleeve bias are each turned off, and furthermore, when the time of TIMA=t27 has elapsed, the drum motor, heat roller motor, static elimination lamp, and pre-transfer static elimination lamp are turned off. . Next, at the timing of TIMA=t29, it is determined whether the scan motor is ready or H3YNC ready, and if YES (Y), TIMA is stopped (see FIG. 47).

Next, a determination is made as to whether it is a “treyful in status 4”,
It is determined whether the toner bag is replaced or not, and whether or not there is no toner. If the tray is full, the tray full flag is set to 0' after paper is removed from the output tray, and the output tray counter is set. If you reset the toner pack and change the toner pack, the reset will be performed when the state returns to its original state.
In the case of toner replenishment, a reset is also performed at the stage of recovery. After passing through the above flow, it is then determined whether or not it is "power saving" in "Status 3", and if no (N), then it is determined whether "No paper" in "Status 4" is in progress. , if yes (Y), [cassette paper out detection ONJ]
If it is NO (N), the “out of paper” flag is set to ``O'', and if it is ``Fuser Ready'', the [Status Waiting] flag is set to ``O''. Next, the IPRD is
YON and IPREQON are determined, and it is determined whether "power saving" is in progress and whether "one paper is out" or not, and if there is no problem, rTMA starts. The registration motor 149 rotates in reverse at TIMA=t01, and stops at TIMA=t02. At this stage, the leading edge of the paper is held between the paper feed rollers.

Next, it is determined whether it is "manual feed" or not, and if no (N), it is determined whether rlPRNT ONJ or not, and yes (Y).
If so, it becomes rIPREQ OF'FJ. Next, it is determined whether or not timer E (TIME) is in operation, and if it is in operation, it is determined that rTIME=t30, and the answer is yes (Y).
If so, it will be a TIME stop and transfer Sharjar 305
．． Peeling 11t (peeling) charger 306. Developer motor 141. Each of the fixing device motors 143 is turned on. F
If TIME is not equal to t 30J, TIME is stopped and the flow shifts to [F] (see FIG. 48).

Next, TIMA starts and plaid solenoid 158
turns on, rTIMA=t IJ, developer motor 1
41. Static elimination lamp 302. Pre-transfer static elimination lamp 303. Each of the drum motors 147 is turned on. “TIMA-
12'', the transfer charger 305. The fixing device motor 143 is turned on.

When rTIMA=t 3J, the peel charger 306 is turned on.
Then, when rTIMA=t4J, TrMA is restarted from 0'. Next, whether it is "manual feed" or not.
The upper and lower cassettes are determined, and if the cassette is the upper cassette, the paper feed motor 151 is rotated forward to feed the upper cassette, and if the cassette is the lower cassette, r
After waiting until TIMA=t 5J, the paper feed motor 151 is reversed and lower paper is fed. Then rT'1MA=t 5
Turn on the laser 344 when J, rTIMA=t
At 6J, the charger 304 is turned on.

Check whether laser ready is present at rTIMA=t7i, 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 ◎ (see Figure 49).

Next, the paper feed motor 151 is stopped at rTIMA=31J,
rVsYNc command received” and select YES (Y).
If so, it is determined whether or not rT IMB<t 32J, and if YES (Y), TIMB is stopped, the "Page Top" [Page End Counter] count is started, and image writing processing is performed. Timer〇、D (TIM
Start C, D>, T at rTIMA=t 34J
IMA stop and paper feed motor 151 stop. Then r
When TIMc/D=t35J, the registration motor 149 rotates forward,
Set total counter 354 ON, rT I MC/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 IPEND pulse is output. After that, each counter is set to +1 and "tray full", "drum replacement", and "developer replacement" are performed.

If it is "heat roller replacement", each status will be displayed. In addition, the determination result of the rVSYNC command reception 1 is as follows.
If no (N), the charging chip v-
Laser 344. with di t3040F'F, rTTMB=t47J. Hakuri Charge v304OFF, rTI'MB
=t 47J and laser 344. Hatari Charger 30
6. Turn off the developer motor 141 h-=hOFF, rTIM
B=t 4a', transfer charger 3o5. The fuser motors 143 are turned off, and the drum motors 147. Static elimination lamp 3o2. Turn off the pre-transfer static elimination lamp 303 ['hOFF, rTIMB=t 50'
turns off the plaid solenoid 158.

Also, in the flow of rTIMB<t 32J, -<N)
If so, then it is determined that rTIMB<t 33J, and no (
N), TIMB stop, T, IMA start. After that, turn on the plaid solenoid 158,
rTIMA=t At the IJ stage, the developer motor 141. Drum motor 147. Static elimination lamp 302. The pre-transfer static elimination lamps 303 are each turned on. and rTIMA=t
2J, the transfer charger 305. Fuser motor 14
3 is turned on, and when rTIMA=t3J, the peel charge-P2O3 is turned on. Then rTIMA=t 4
It is determined whether or not it is J, and timer A is stopped by -H and restarted. And the developer motor 141
．． Transfer charger 305. Hakuli Charger 306. Each of the fixing device motors 143 is turned on. rTIMA=
Laser 344 ON at t 5J, rT IM=t 6J
The charger 304 is turned ON and rTIMA=t. At 7J, it is determined whether the laser is ready or not. If YES (Y, ), TIMA is stopped (see FIG. 50).

Next, it is determined whether the toner full detection switch 126JON is ON or not, and if it is ON, a display is performed, and if it is not ON, it is determined whether the toner empty detection switch 125J 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 judged that "specified cassette paper is out", and if there is no paper, a message to that effect is displayed and the 5TPF (stop flag) is set to 1'. do. Next, timer E (TI
ME). If the stop flag is 1', set 5TPF to 0' and print ready IPRDY to O
Make it FF. If 5TPF is not 1, it is determined whether it is "manual feed 1" or not, and if it is "manual feed 1", TIME stop, manual stop switch 328 OFF, manual feed O', TIMB stop, cassette paper out detection switch ON or not. This determination is made, and then the print request IPREQ is turned ON, and the process shifts to the flow shown in FIG.

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 when each timer is in operation, counts up. Read all input information in the port input reading part. Then, the timer is stopped at rTIMc/D=t38J, and it is determined whether or not rTIME='t39J. From then on, the operation of timer E (TIME> is continued, and at each time, "toner replenishment motor 159J, r register motor 149" is stopped. Then rTIME
- Determine whether rTIMA is in operation after t4j (
This is to determine whether the next sheet of paper will be printed). If TIMEA is in operation, TIME is stopped. After that, the charger 304 is turned off at [TIME=t 41J.

rTIME=t 42J and laser 344. Hakukuchaja 306. Each developer motor 141 is turned off. Transfer charger 305 with rTIME=t 43J
．． Turn off each fuser motor 143, rTIME-
At t44J, the drum motor 147 and the 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 temperature fuse stage", "Scan motor 312 ready", and "Door switch 129 OFF" are determined, depending on each status. , 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 is started, it is determined whether or not there is a parity error j. If it is an error, the flag of the status DATA 81 j becomes 1', indicating an "illegal command error." If it is not a “parity error”, [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, "Top/Bottom Margin" will be determined.
"Bottom Margin" is specified and "Status Set" is set to 1.
', and any one of rDATA21 to rDATA11J is specified. If it is not "Top/Bottom Margin", it is determined whether "manual feed designation" is specified, and if YES (Y), manual feed display and paper size display are performed next, and the paper size register is set. Then, when the manual feed status is set, the status becomes 1, and the rDATA41J flag becomes 1', and then the flow shifts to status 4, where the out-of-paper flag becomes 'O'. If it is not "manual feed specification", it is determined whether or not it is "cassette specification", and if it is "cassette specification", the upper/lower display paper size is displayed, the paper size register is set, the manual feed status is reset, and the status becomes 1. , DTA41 flag ``O'', it is determined whether or not there is no paper in the cassette, and if there is no paper, the flag becomes 1'. If the cassette is not 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 so, the select lamp is lit, and if the select lamp is not lit, it is determined whether the select lamp is off or not. If YES, the select lamp is turned off, and if NO (N), the process moves to the next flow.

Next, the flowcharts shown in FIGS. 55 (Δ) to (C) will be explained.

In addition to the above-mentioned "shadow method", "power save" is included in FIG.

The fuser is controlled to the power save temperature, and the "Status 3 power save flag 1" is set, and when the power save is canceled, the scan motor 312 is controlled to the normal temperature of the fixing device, and the "Status 3 power save flag is set to O.
”, 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 5man or not, and if NO (N), the top/bottom margin change table data D2 is read. Next, calculations are performed on the top margin table data D1 and the margin change table data D2, and the contents of the top margin adjustment switch (442 in FIG. 14) are read. Next, the top margin adjustment table data D3 corresponding to the switch is read, the margin adjustment table data D3 is added to and subtracted from the values of Dl and (DI+D2), and the calculation result D4 is set in 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 5mn+
If it is NO (N), the 1-Tub/Bottom Margin change table data D2 is read.
Subtraction is performed between the bottom margin table data D5 and the margin change table data D2, the contents of the top margin adjustment 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 for 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 will be the lower stage, and the cassette upper/lower stage adjustment switch
4) Read the contents and place it on the cassette that corresponds 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, the contents of the cassette/manual feed adjustment switch (440 in FIG. 14) are read, the cassette/manual feed adjustment table data D10 corresponding to the switch is read, and then.

Add or subtract adjustment table data DIO to the value of D7,
The calculation result D11 is set in the write margin counter 277.

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 it is the upper stage (standard) or not.
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 440 are read, and the cassette upper/lower stage adjustment table data D8 corresponding to the switch is read. The data D8 is added to or subtracted from the value of the D12, and the calculation result D13 or the data D12 is set in the left margin counter 276. If it is manual feed, the contents of the cassette/manual feed adjustment switch 441 are read and the cassette/manual feed adjustment table data D corresponding to the switch is read.
10 is read, addition and subtraction are performed between the data D10 and the value of the data DI2, and the calculation result D14 is set 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 IPREQψ (S62) rises. After that, the developing device motor 141 etc. are turned on, and from time 14 to t
8, the paper feed motor 151 operates to convey the paper in the cassette. 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 writing is performed until time 11 when IPREQφ (S62) falls, and after time t11 elapses, the registration motor 149 continues to rotate until time t12 and stops. The laser diode 344 is then turned off at time t14.

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

In FIGS. 58 and 59, the paper feed motor 151 is not used, and the registration motor 149 is rotated in the reverse direction to drive the paper feed roller, which is used for transporting the paper, and the registration roller is driven by forward rotation. ing. In addition, both of them receive the print start command IPREQ after receiving the "manual feed command".
φ (S62) is made to rise. FIG. 58 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 t 0 is reached.
At 1tlt, the registration motor 149 rotates slightly in the reverse direction and stops when the leading edge of the paper is added, and at the time when the "manual feed command" is issued and IPREQφ (862) rises, the registration motor 149 rotates in the reverse direction again and moves the paper to the transfer position. It is designed to be conveyed until it stops. Therefore, it is possible to print on paper from the cassette before issuing the manual feed command J.

In the case shown in Fig. 59, the manual feed switch 326 is turned on after the "manual feed command" is issued first, paper is set in the manual feed guide, and in this case, the registration motor is turned on after the predetermined time to1 has elapsed. 149 is continuously rotated in reverse to convey it to the transfer position. In both cases, the registration motor 149 is set to stop at time t21 after a predetermined period has elapsed after the manual stop switch 328 is turned off (time t20), but this causes the paper set in the manual feed guide to stop. This means that "jams" will not occur even if the length is longer than the displayed size. 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. Equipment utilization increases.

70-■, which is a transition from the flow shown in the above @47 diagram.

The contents of ■ and ◎ will be explained with reference to FIG. 60.

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 shifts to B, and the No. maintenance mode operation specified via the test key is executed.
When the exchange mode is selected, the flow moves to ◎, and it is determined whether [Drum Replacement 1) 1J, ``Developer Replacement'', or ``Heat Roller Replacement J'' is selected, respectively. Replacement No. Set", "Heat Roller N.

``Set'' to the non-volatile generated RAM 10 via the dest key.
Predetermined data processing for 7 is performed.

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

[Effects of the Invention] As described in detail above, the present invention allows a recording operation to be performed even if the recording medium size specified from the outside and the size inside the recording medium storage section are different, if the size inside the storage section is larger. Therefore, it is possible to improve the efficiency of recording work.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram showing the relationship between the device and external devices in the present invention, FIG. 2 is a schematic sectional view of the print control unit (printer) in the system diagram, and FIG. 3 is the laser scanner unit in FIG. 2. FIG. 4 is a schematic diagram showing the paper feeding section in FIG. 2, FIG. 5 is a schematic diagram showing an example of the paper discharging section in FIG. 2, and FIG. 7 is an enlarged plan view of the display section in FIG. 6, FIG. 8 is a block diagram showing an example of the data control section in FIG. 1, and FIG. , FIG. 10, and FIG. 12 are respectively format diagrams of data handled by the data control section, FIG. 11 is a correspondence diagram of the areas of the recording section in the data control section and paper, and FIG.
14 is a detailed circuit diagram of each detector in FIG. 13. FIG. 15 is a block diagram showing details of the drive circuit and output elements in FIG. 13. The figure is a detailed circuit diagram showing the motor drive circuit and laser scan motor in Fig. 13, Fig. 17 is a detailed circuit diagram showing the laser modulation circuit and semiconductor laser in Fig. 13, and Figs. 18 and 19 are detailed circuit diagrams showing the semiconductor laser. A characteristic diagram showing the relationship between
21 is a detailed circuit diagram showing the beam detection circuit and beam detector in FIG. 13, and FIGS. 22 and 24 are for explaining the operation of the circuit in FIG. 21. 23(A) and (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 write control circuit in FIG. 13, FIG. 26 is a circuit diagram of the interface circuit in FIG. 13, and FIG. Relationship diagram, Figure 28 is an explanatory diagram showing the contents of status used in the device of the present invention, Figure 29
The figure is a relationship diagram of the beam scanning position and data writing position on the recording photoreceptor in Figure 3, Figure 30 is a plan view showing the printing area portion of the entire surface of the paper including the paper size in Figure 29, Figures 31 and 32 are time charts for explaining the operation of the circuit in Figure 25, Figures 33 and 34 are print pattern diagrams printed on paper, and Figures 35 and 36 are time charts for explaining the operation of the circuit in Figure 25. 37 is a detailed block diagram of the high-voltage power source for charging in FIG. 15; 41 are characteristic diagrams for explaining the operation of the circuit in FIG. 37, FIG. 42 is a schematic diagram showing the relationship between the laser scanner unit and the recording photoreceptor in FIG. 2, and FIG. 43 is a recording FIG. 44 is an explanatory diagram showing the relationship between the photoreceptor and paper, and FIG. 45 is a modified example of the paper output tray shown in FIG.
), (B) and FIG. 46 are detailed views 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 flow charts for explaining the 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, 20... Storage means, 101...
Control means, 301... Recording medium, 320.324...
-Size detection means, 317.321...Recording medium storage unit. ''To the deaf 1L - Figure 19 15 (Ol), ward. 1 1 L ------J Figure 24 Hiroen-4-■-1 Figure 42 Figure 43 Figure 63

Claims (1)

[Claims] In an apparatus having an information recording means that scans and records information on a recording medium, a recording medium storage section in which a plurality of recording media are stored, a detection means that detects the size of the medium in this recording medium storage section, and a device specified by an external device. Compare the recording medium size information from the external device and the medium size of the recording medium storage unit, and compare the recording medium size information from the external device and the medium size of the recording medium storage unit, and compare the recording medium size information from the external device and the medium size of the recording medium storage unit. A recording apparatus characterized in that if the value is large, recording is performed based on the recorded information in the storage means.