JPS60236361A - Recording device - Google Patents

Abstract

PURPOSE:To simplify a recording operation to a recording medium through a manual supply means for recording medium by setting each time count means according to designated size data given from a memory means. CONSTITUTION:In case the information supplied through a main control part 6 is equal to character code information, the form size data in supplied to a page code buffer control circuit 7. The subsequent data are supplied to a page code buffer 9 and stored there. When an END code is detected after the input is through with the character code information, this code is sent to a main control part 6 and the circuit 7. Thus control is carried out for line feed and character pitch and a character size area is switched. When transfer is through with the character code data equivalent to a line to a line buffer 10, a line buffer counter 11 is reset to the initial address.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for recording information from an external device onto a medium by beam scanning.

[Technical background of the invention and its problems] In this type of recording device, paper is fed from a recording medium storage unit (hereinafter also referred to as a cassette) that stores a plurality of sheets of paper as recording media. , Recording medium manual feeding means (hereinafter also referred to as manual feed guide) that manually feeds paper
There are some that have the following.

However, in conventional devices, the size of the paper from the cassette is a specified size, so it is easy to specify it from an external device (for example, a word processor), whereas the size of the paper fed from the manual feed guide varies. For,
Specifying the recording area on the paper (especially the printing start position in the vertical and horizontal directions of the paper).

There are problems in that the specification of the end position becomes complicated, the operation becomes complicated, and the specified area and the recording area may not match.

[Objective of the Invention J The present invention has been made in view of the above-mentioned circumstances, and provides a recording medium that simplifies the recording operation from the recording medium manual supply means to the recording medium and allows recording to be performed accurately in the target recording area. The purpose is to provide a device.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides an apparatus for recording recording information from an external device onto a recording medium by scanning a beam over the recording medium. A recording start position timing means for measuring the time from the scanning direction to the recording start position, a recording end position timing means for measuring the time from the scanning start position to the recording end position in the scanning direction of the beam, and a recording medium manual for manually feeding the recording medium. a supply means, and a storage means for storing data regarding a recording area corresponding to the medium size of the medium manual supply means designated from an external device, and the set of each of the time measurement means is configured to store data regarding a recording area corresponding to the medium size of the medium manual supply means specified from an external device, and the set of each of the time measurement means It is characterized by being carried out by.

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

FIG. 1 is a block diagram of a system for recording information on a recording medium by a laser beam. Information from a host system 1 (electronic computer, word processor main 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 a printer 300 with a video interface.
A print control section 100 shown in the figure is built-in.

In figure M2, 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. A charger 304 uniformly charges 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 an upper cassette size detection switch (detection means) provided on the upper cassette 317 and composed of 4 bits for detecting a size identification mark. Reference numeral 321 indicates a lower paper feed roller, 323 indicates a lower paper out switch, and 324 indicates a lower cassette size detection switch. In addition, the upper section can store 250 sheets of paper from the lower section, and can also be used with cassettes.

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

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

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

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

330 is a conveyor belt for conveying the paper separated by the peeling charger 306 to a fixing device; 331 is a fixing device for fixing the transferred toner on the paper;
332 is a fixing roller, 333 is a heater lamp for heating the fixing roller, 334 is a thermistor for detecting the surface temperature of the fixing roller, 335 is a discharge roller, and 336 is a sheet discharged from the fixing device 331. 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 305; 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 340 is a PC board unit that controls the printer 300.

342 is a photoconductor 301 provided near the photoconductor 301;
A thermistor with extremely low thermal resistance is used in the drum temperature sensor to detect the temperature of the 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, the laser beam emitted from the semiconductor laser 344 is
The beam is corrected into parallel light by the collimator lens 343, and the parallel light is applied to one surface of the octahedron of the 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 spreads across the beam scan range 348 from left to right. scanned in the direction. A portion of the laser beam within the beam scanning range 348 is guided by a reflecting mirror 345 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. Also, the beam scanning range 348
The laser beam that is not incident on the inner reflecting mirror 345 is irradiated onto the photoreceptor 301. Photoreceptor 30 in Fig. 3
1 is shown at 349 where the laser beam is scanned.

304 represents a charger, and 347 represents a sheet of paper. In addition, as shown in FIG. 2, in an actual printer, the laser beam that has passed through the r/θ lens 314 is directly directed to the photoreceptor 301.
rather than being illuminated by reflective mirrors 315 and 316.
However, in FIG. 3, reflective mirrors 315 and 316 are not shown for convenience, and the laser beam that has passed through the f/θ lens 314 is directly irradiated onto the photoreceptor 301. This is clearly shown.

Here, the configuration of the reflecting mirror 345 will be explained with reference to FIG. 42. As shown in the figure, this reflecting mirror 345 is attached to a support member 456 located outside the beam incidence area with a screw 455 via a plate spring 454, and a fine adjustment screw 457 is attached to the bottom of the plate spring 454.
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 bus sensor 394 in front of the registration roller. Manual stop switch 3 in Figure 2
28 only detects manually fed paper, whereas the purpose of the registration roller front bus 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 the light does not enter the registration roller front bus sensor 394, so that the fed paper can be confirmed. Furthermore, if the paper is not fed correctly, the paper does not reach the position of the bus sensor in front of the registration roller, and the light from the light emitting diode 393 continues to be incident on the bus sensor in front of the registration roller. ,
It can be recognized that paper has not been fed.

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

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

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

Therefore, since the printing side of the paper is on the bottom side, the first page is on the bottom side, but if you take out the paper from the tray 384 and turn the printing side of the paper on the front side, the first page will be on the top side and the last page will be on the bottom side. The page is on the lower side, and the above-mentioned drawbacks of the non-reversible tray 397 can be solved. In the figure, 385 is a paper stopper that can be slid according to the length of the printing paper in the conveyance direction. 388 is a paper holding actuator to prevent the paper stored in the tray from floating; 395 is a paper ejection switch to confirm that the paper is properly stored in the tray 384; and 391 is the presence or absence of paper in the tray 384. 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, thereby detecting the presence or absence of the paper '390.

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
Reference numeral 9 separates the actuator 388 at least while the paper 390 is being discharged into the paper output tray 384, and activates the solenoid in synchronization with the current state signal when the paper should be detected, for example, during a printing operation or when the paper is stopped. 389 is turned off,
The separation of the actuator 388 is released, and a 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.
If a paper jam or toner replenishment occurs, open it in the direction of the arrow and process it. Further, the maintenance cover 352 is
Although the front cover 351 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 a display lamp indicating that the maintenance mode is in the state; 407 is a display lamp indicating that the replacement mode is in the state; 404 is the operation mode number in each mode. a selection switch for making a selection; 40;
Reference numeral 8 indicates a selection lamp indicating that the selection operation by the selection switch 404 is possible; 405 a test switch for selecting a test print mode and executing operations in the maintenance, replacement, and test print modes described above; 360; Main exposure adjustment volume described later, 36
1 indicates volumes for adjusting shadow exposure. Further, both the volumes 360 and 361 have a structure in which an adjustment screwdriver is inserted and turned, and cannot be turned by hand with the maintenance cover 352 open.

FIG. 7 is a detailed diagram of the 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.

380 blinks if 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 paper cassette is A4 vertical, A4-R lights up, and if 80 is selected in the manual feed mode, 80 lights up. 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 is printer 30
It represents the shape of 0 and is always lit, 367 is the photoreceptor 30
1, which is always on; 368, which represents the top shape of the printer 300, is always on, except when the conveyance section is jammed; and 369, when the conveyance section is jammed (when the above-mentioned 374 is blinking), the above-mentioned 368 is lit alternately. 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 a dot-compatible page memory 20 corresponding to the print area on the paper of the printer 300 using a data converter. 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 (JIS
In this case, the character generator 15 generates a character pattern corresponding to the character code, and the dot information of the character pattern is stored in the page memory 20. The other is image information, and in this case, it is already input in the form of dot information, so it is stored in the page memory 20 as is. Hereinafter, an overview of the data control section 2 will be explained with reference to FIG.

Information from the host system 1 is sent to the interface 50 via the signal line SO1, and the information is further stored in the data latch 3.

Signal line 8 between interface 50 and host system 1
02 is sent from the host system 1. The data strobe signal and other control signals 1!803 are
Busy signal and status signal lines from the data control device.

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

Thereafter, character code data is entered in the order of the first line, second line, . . . nth line, and finally an END code indicating the end of data for that page. Character code data for one line is made up of a code indicating the character size, a character code, and an F code indicating the delimitation of one line of data.

Figure 10 shows the format for image information, and shows the image identification code indicating the image information and the size of the paper to be printed.
The J1tliz identification code is included at the beginning of one page's worth 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 1 control circuit 7 via a signal line 806. . Therefore, the paper size data is input from the distributor 4 to the page code buffer 1 control circuit via the data line 807. The next 1st line, 2nd line......n
The data up to the row is input from the distributor 4 to the page code buffer 7 via the data line 308. At this time, the character code data is stored in a memory area on the page code buffer 9 designated by the address counter 8. When the input of one page's worth of characters into the page code buffer is completed and the END code shown in FIG. 9 is detected by the decoder 5, the main control unit 6. EN to each page code buffer 7 control circuit 7
Inform D code detection. When the page buffer control circuit 7 confirms through the signal line SO9 that input of character codes for one page into the page code buffer 1 is completed, data is stored in the page memory 20 in units of dots.

FIG. 11 shows the correspondence between memory spaces on the page memory 20 and sheets. In FIG. 11, broken lines indicate the outside of each sheet. In other words, 25 is the leading edge of the paper (common to all sizes), 2
4 is the left 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 A3 size paper, 31 is the rear edge of A5 size paper, 30 is the right edge of 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.
, 0> points. Here, ADR (0, 0) indicates that both the vertical address (ADRV) and the horizontal address (ADRH) are 0'. In other words,
The write address counter 18 and the read address counter 19 are configured to input vertical addresses (
ADRV> and a horizontal address (ADRH>), ADRV represents a vertical address (arrow b in FIG. 11), and ADRH represents a horizontal address (arrow C in FIG. 11).

43 is the last horizontal address of A3 size paper (A3HE
), 44 is the horizontal address of A4 size paper (A48E)
, 45 is the horizontal address (A5HE) of A5 size paper. Similarly, 46 is the last vertical address of A3 size paper (A3VE), 47 is the vertical address of A4 size (A4VE), and 48 is the vertical address of A5 size paper (A5
V'E). 33 is A3 size vertical address A
DRv=o, horizontal address ADRH=A38E point ADR (0, A38E), 34 is ADR in the same way.
(0, A4HE), 35 is ADR (0, A51-I E
) are shown respectively. 36 is A3 size vertical address ADRV='(A3VE), horizontal address ADRI
-1=o point ADR(A3VE.

0) and 37 are similar, TADR (A4VE, O).

38 indicates ADR (A5VE, 0), respectively.

39 is the A3 size vertical address ADRV=A3VE,
Horizontal address ADRH=A3HE point ADR(A
3VE, A3HE), similarly 40 is ADR (A4
VE, A4HE), 41 is ADR(A5VE, A5H
E) are shown respectively.

Storing the character pattern in the form of a dot image in the page memory 20 that consumes the memory space as described above is performed as follows. The character size data of the first line is read from the page code buffer 9 via the signal line 810 to the page code buffer 1 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 811 and to the character generator 15 via the signal line 813, 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,
0), and the write address counter 18
The value of is ADR(0,0). row buffer 10
The character code data is sequentially read out in a constant cycle starting from the first digit, and is latched in the output latch 12 in order to synchronize with the line counter 13. When the first character code (the "T' character in this embodiment) is latched into the output latch 12, the character code and the output of the line/scan counter 13 are combined in the synthesis circuit 14, and the character pattern selection code of the character generator 15 is generated. is input to the character generator 15.Here, the configuration of the line/scan counter 13 will be explained as follows.
The upper 6 bits are a counter that counts scanning lines, that is, a counter in the vertical direction of the character pattern.
In the case of a 40x40 dot character, count 0 to 39 plus, line feed pitch control, 942 minutes, and return 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) )′.

The following describes the operation in the case where the font size is 40 x 40, the horizontal distance between characters is 8 bits, and the vertical distance between two characters is 8 bits. As mentioned above, when the first character code ('T') is set in the output latch 12, that character code and the output of the line/scan counter 13 are combined in the synthesis circuit 14 and the character generator 1
5 is input to the character generator 15 as the character pattern selection code. At this time, since the value of the line/scan counter is (0, 0), the character generator 15 outputs the data of the vertical line "0" and the horizontal "0" (8th pit) of the character pattern. ) is output. The output data of the character generator 15 is latched by the output latch 16 at -H in order to synchronize writing to the page memory 20, and then sent to the page memory control circuit 1.
7, the data is written to the address on the page memory 20 specified by the write address counter 18. In this case, since the value of the write address counter 18 is ADR (0, 0), the vertical address 'Q1. Horizontal address '0
’ 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 write address counter 18 also changes to ADR (0, 1). . Therefore, the character generator 15 outputs the data of the ``0'' line in the vertical direction and the ``1'' line in the horizontal direction of the character pattern, which is latched by the output latch 16 in the same manner as described above. , 1) written to the address. In this way, when writing of the last data (the 4th data) of the 0'th line in the vertical direction 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), which is 06, the output of the character generator 15 is forced to all 0' by the command from the page code buffer control circuit 7, and the ADR of the page memory 20 is (0,
5) 0' is written to the address, and after the write operation is completed, the row address counter is incremented by 1' and the next character code from the row buffer 10 is set in the output latch 12. Also,
The line/scan counter becomes (0, 0), and the write address counter 18 becomes ADH (0, 6). Therefore, next, the data of the 0'th line in the vertical direction of the 0' character pattern is written into the page memory 20. At this time, the write address counter 18 is ADH (0, 6), (0, 7).
), (0, 8), (0°9), (0, A>), and the character pattern data of 0 is written to the address specified by the write address counter 18. .

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

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

In this way, the character pattern data of the 0'th line in the vertical direction is sequentially written to the page memory 20, and when the 'LF' code is output to the output of the line buffer 10, the 'LF' code is detected. The signal is transmitted to the page code buffer 7 control circuit 7 through the output line 814, and the character pattern writing operation from the character generator 15 is stopped. After that, write address counter 1
8 is sequentially plus "1' and O' is forcibly written to the page memory 20. Then, if the value of the write address counter 18 is currently designated as A3 size, ADR (
0, A3HE), that is, the 33rd point in FIG.
．． 18(0), the line/scan counter 13 is (1,
0>, respectively. And output latch 12
, T' is the character code starting from line buffer 10.
is set again. And the vertical direction of the character pattern ゛1
The character pattern data of the 'th line is written into the page memory 20. Similarly, the vertical direction of the character pattern ゛2'
.

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

Line/scan counter 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, 0' is written into the page memory 20 as a forced pattern for the remaining eight lines. When the writing of 0' for 8 lines is completed, the address value of the writing address counter 18 is changed to the point 61 in FIG.
At (30, O), the row address counter 11 is (0).

The line/scan counters are each set to initial values (0, 0). This completes all write operations including the line feed pitch for one line. Then, the character code data of the next second line is transferred from the page code buffer 9 to the line buffer ylo. When the transfer of character code data is completed, the row address counter 11 returns to the initial at1nos (0). Thereafter, character pattern data on the second line is written in the same manner as writing the character pattern data on the first line. Therefore, when all writing operations for the character pattern data on the second line are completed, the address value of the write address counter is ADR (60, O), and the row address counter 11 is (
0), and the line/scan counters are set to (0, O), respectively. In this way, the character codes of each line are sequentially patterned and the pattern data is written onto the page memory 20. Then, when the "END" code indicating the last row is detected from the row buffer, the data writing operation of the character pattern is stopped. It is forcibly set to 0' and also tells the page memory control circuit 17 that writing of the character pattern data is completed.

After receiving the write end signal, the page memory control circuit 17 selects the final memory address (39 point ADR (A3VE) in FIG. , A3
Forcibly write 0' to HE)). And Figure 11 3
9 points is written, and the writing operation of character pattern data for one page of the designated paper size to the page memory 20 is completed. , the row address counter 11 is initialized to (O), and the line/scan counter 13 is 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 805. 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 S06.

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 the screen 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 the 1st to 32nd points (at L/S ADR (0, 0)).
) ADR the write address counter 18 to write from
Set to (0,0). Then, the data length for one line in the horizontal direction is determined from the paper size identification code by referring to a table in the page memory control circuit 17.

Therefore, if the paper size of the image information input to the page memory 20 is A4, the data length of one line is a value up to 44 points (A 4 HE ) in FIG. 11, that is, A4HE" becomes.Host side system 1
Naturally, the length of the image information per line sent from ``A48E'' is ``A48E'', so the image data 19 image data 2. ...The data length of the image data is "A4VE", and the number of image data m is as shown in Fig. 11 47
The point value is A4VE'. Therefore, the image data 1 in FIG. 10 is transferred to the page memory 2o from 32 points ADR(0,0) to 34 points ADR(o in FIG. 11).

A48E), image data 2 is a 51-point line, image data 3 is a 52-point line...image data m is a 37-point line, so the final address is 4.
It becomes 0 point ADR (A4VE, A4HE). Image information is written into the page memory 2o while controlling the write address counter 18 in this manner.

The character pattern data 13 written in the page memory 2o in this manner is sequentially output to the latch 21. Gate circuit 23. Data to be printed on the print section 97118 is sent through the interface 22 and the interface bus 817 to 817. In FIG. 8, S17 is a status data line from the print control section, 818 is a command data line for specifying the operation mode, etc. to the print control section, S19 and S2
0 is the strobe signal line when transmitting condo data and print data, S21 is the G signal @ line from the print control unit, S
22 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,
S24 is the ready signal line of the printing 1liIJa section, S2
Reference numeral 5 indicates a print request signal line for notifying a printable state, and reference numeral 826 indicates a select signal line (2 lines) for specifying the data content of the data line in the interface bus S17.

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

To explain in more detail when data is sent to the print control 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.

By this horizontal synchronizing signal 822, each data of the 32 point line in FIG. S2
2, the address is sequentially changed one line at a time, and this operation is repeated until the page end signal 823 is received from the print section 11III11, and the data in the specified area of page memory 20 is printed. The page end signal 8 is sent to the control W section.
23, the data transmission is forcibly stopped. In the print control section, the page end signal 823 is output at the same timing as the horizontal synchronization signal 822.

In addition, in correspondence with the memory addresses in FIG. 11, the print control unit outputs 46 points for the last line A3 of the memory area of the paper size, and 47 points for A4, or at a timing earlier than that.

Further, in the page memory control circuit 17, the page memory 20
When sending out 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 data is sent out. Control is performed to permit write operations to the memory area where the process has been completed. 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 print data write control circuit 19. Interrupt request signals from the timeout signal lines $28 from the general-purpose timer 103 are sent to the microprocessor and processor 1.
Tell 01. A general-purpose timer 103 generates basic timing signals for controlling paper conveyance, drum rotation processes, and the like. In this embodiment, this general-purpose timer 103 has five
It is set to m5ec. 104 is a ROM (read only memory) that contains all control programs for operating the print control unit 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> contains top margin control data and addresses (4002, 4003) for paper size A3.
) contains bottom margin control data and address (400
Addresses (4, 4005) contain data for left margin control, and addresses (4006, 4007) contain data for right margin control, respectively. Similarly, address (4)
008 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 information recording start position in the direction intersecting the beam scanning direction (that is, the paper conveyance direction), and the bottom margin refers to the recording end position in the paper conveyance direction. refers to the period from the start of scanning in the beam scanning direction to the start of recording, and the left margin similarly refers to the period 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 top/bottom adjustment table, and a cassette/manual feed adjustment table. Addresses (4200 to 4'2 FF) contain data on the charging characteristics of the photosensitive drum 301, and 5 of A to F
Contains types of data. This data is then used for temperature correction control of the charging charger 304, which will be described later. Addresses (4300 to 43FF>) are exchange data tables, including photosensitive drum 301, developer 3
Contains each replacement cycle data of the developer in 07 and the fixing roller 332.

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

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

B, . . . Contains an IEI paper size register (which stores cassette size data based on signals from power and set size detection switches 320 and 324, which will be described later), a 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,
If the cassette size is thicker, print control section 1 in the latter stage
A print operation command is issued to 00. Therefore,
Even if the printing paper is larger than the size of the information sent from the outside, it can be printed, improving the usability. 10
Reference numeral 7 is a non-volatile RAM, and the data in the memory is retained even when the power is cut off. In addition, the non-volatile generation RAM
The data contents within are shown in FIG. 45(B). Figure 45 (B
), the address (6000) contains the drum characteristic number input from the operation unit in the exchange mode, and the address (6100) contains the jam information when a jam occurs, and when the jam occurs, the power is turned off once. This is used to prevent forgetting to dispose of jammed paper inside the machine when the machine is turned off. Address (6200) is a paper discharge tray counter that counts the sheets in the reversing tray 381, and is incremented by 1 each time one sheet of paper is sent to the reversing tray 381.

When this count value reaches a predetermined value, the tray becomes full and a message is displayed on the operation unit to prompt the operator to take out the paper from the tray. Further, the main paper discharge tray counter is automatically cleared when paper is removed from the tray by the operator. Therefore, even if the power is turned off, the number of sheets remaining in the tray is maintained by the book counter.

Address (6300) is a drum exchange counter, which counts up by 1 for each print. When the value of this counter reaches the value of the replacement table (drum) shown in FIG. 45 (A>), the operator is informed by the display on the operating 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 an N source sequence circuit, and the non-volatile generation RA
M10717) Power 1 [1 when 1 ON. ti[l! It has the function of preventing erroneous operation when turned off. 399 is a power supply device that supplies power to the control section. Reference numeral 110 denotes an input/output boat 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. Reference numeral 116 indicates driving elements such as a motor, a high-voltage power lamp, a solenoid, a fan, and a heater. 1
15 is a drive circuit for the drive element 116, and 114 is an output port that provides an output signal to the drive circuit 115. 312 is a laser scan motor for operating the laser beam, 118 is its drive circuit, and 11
7 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, a select signal 831 causes an 8-bit signal S32 to be input to the input port 112 in FIG.

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 pack 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 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 the temperature fuse provided in the fuser, 131 is the drive mold 11 (+24VB)
eONloFFsat1MC! It's J.Lee. Since one side of the temperature fuse 130 is connected to the +24VA power supply, if the temperature fuse 130 is blown due to an abnormality in the fixing device, the -MO relay 131 is turned off and the driving power is turned off. 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. Also, comparator 13
A reference voltage Vref3 is applied to the other input of 2. Therefore, when the temperature fuse 130 blows, the input of the comparator 132 becomes Ov. Therefore, comparator 132
A temperature fuse blowout detection signal is output as the output. 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 combination of codes by the upper or lower cassette size switches (four pieces) are the same, the paper size for domestic use or for the United States is selected depending on the state of this switch.

134 is a gym reset switch, which 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, if this switch is not turned on after the above processing, 1. Jam or toner full operation display will not be cleared. Reference numeral 392 is a paper discharge tray sensor for detecting paper in the tray shown in FIG. 334
is a thermistor that detects the temperature of the fixing device, and the temperature detected by this thermistor is controlled to be constant. . The output of thermistor 334 is connected to resistor RO3 and comparator 136.1.
It is connected to the input side of 37. Therefore, the input voltage of the comparator changes as the resistance value of the thermistor 334 changes due to temperature.

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

The other input terminal of the comparator 136 has a resistor RO6
A voltage divided by RO7 is applied, and the output of the comparator 136 changes depending on whether it is higher or lower than the divided reference voltage. Also, resistors RO6 and R
A resistor RO8 is connected to the connection point of O7, and one end of the resistor RO8 is connected to the collector of the transistor 138.

Therefore, when this transistor 138 is turned on by the input signal (power save signal) 83, the comparator 13
The reference voltage of 6 is lowered by the resistor RO8, and the temperature control of the fixing device is lower than when the transistor 138 is OFF. Therefore, the power consumption of the fixing device becomes low and the fixing device enters a power save state. Also, comparator 137
The reference voltage is given by the voltage division of resistors RO4 and RO5. Since the reference voltage of the comparator 137 is set much lower than the reference voltage of the comparator 136, it is possible to detect a temperature drop in the fixing unit due to heater disconnection or heater drive circuit failure during printer operation. can. And the output S of the comparator 136
33 is input on one side to multiplexer 139 and is read by microprocessor-101. Note that this input signal is used to detect the ready state of the fixing device. The other signal is used as a drive signal for the fixing device heater lamp 333 in FIG.

342 is a drum temperature sensor that detects the temperature near the photoreceptor 301. The output side of thermistor 342 is connected to resistor R58 and the input of operational amplifier 270. Therefore, the resistance value of the thermistor 342 also changes depending on the temperature change near the photoreceptor 301. Therefore, operation 12
The pressure 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. The operational amplifier 270 is a voltage follower, and its output is A/
It is connected to the input of the D converter 271. and,
The operational amplifier 27 is controlled by the A/D converter 271.
Converts the output voltage of 0 to a digital value and sends it to multiplexer 1.
39 to be read by the microprocessor 101.

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 is a cassette upper/lower adjustment switch, 441 is a cassette/manual feed adjustment switch, and 442 is a top margin adjustment switch. These various adjustment switches are installed inside the device, and 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 amount of change (1 bit) in the top margin adjustment switch is determined by the number of pulses that is an integral multiple of the output pulses obtained from the scanning beam detection means. These switches are set by a service engineer who executes a test mode to be described later and determines the print status when a test print is performed.

FIG. 15 is a detailed block diagram of the drive circuit 115 and output element 116 in FIG. 13. In FIG. 15, 141 is a developer motor, and a DC-driven Hall motor is used. Reference numeral 140 is a driver for the imager motor, which performs PLL control. 143 is a fixing device motor, and a D'C-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.
Rapid weight loss control was 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 1200PρS, and the drive is performed at a portion where less vibration occurs. 149 is a registration motor that drives the registration roller 329 and manual feed roller 327, and is a pulse motor. 148 is a driver for the registration motor, which uses a constant voltage two-phase excitation system. The speed is 4
It is about 00PPS.

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.

A defrosting lamp 302 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.

A pre-transfer static elimination lamp 303 is placed in front of the transfer charger to increase transfer efficiency, and is composed of a plurality of red LEDs. R11 is a current control resistor for the pre-transfer static elimination lamp, and 153 is a driver for the pre-transfer defrosting lamp. Reference numeral 158 denotes a solenoid for a toner collection blade, and when this solenoid is turned on, the blade 310 is pressed against the photoreceptor 301. 154 is a driver for the blade solenoid 158. Reference numeral 159 denotes a toner replenishment motor for replenishing +toner from the toner hopper to the developing device 307, and as this toner replenishing motor rotates, toner is replenished from the toner hopper to the developing device 307. The operation of the toner supply motor 159 is performed according to the output of the prologue concentration detection sensor shown in FIG. 14. 155 is a driver for the toner supply motor 159. 131 is an MC relay that operates in conjunction with the door switch similar to that shown in FIG. 14, and 156 is its driver. Then, as shown in Fig. 15, M
The power supply side common for motors, lamps, etc. that excludes the C relay 131 is connected to the contact 163 of the MC relay 131, and the other contact is connected to the +24VB power supply.Therefore, when the MC relay 131 is turned on, the It has a configuration that allows the motor and lamp to operate.

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 835 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 836 is connected to the D/A converter 165,
Data from the charging voltage control data line 837 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 301 onto paper, and the transfer charger is connected to the output of the high-voltage power source 62 for transfer. In addition to the transfer charger output, the 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. A bias voltage is applied to the magnet 0-ra 308 by this voltage, and a developing bias is applied. 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 833 is the thermistor 33 in the fixing unit 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 from the microprocessor-101.

Figure 16 shows the laser scan motor 3 in Figure 13.
12 and its driving circuit 118. FIG. 16th
In the figure, 312 is a circuit diagram inside the laser scan motor. 102. LO3 and LO4 indicate motor coils, and 180, 181, and 182 are Hall elements that detect the position of the motor rotor, respectively. 183,18
4, 185 is a comparator for the Hall elements 180, 181, 182, the output of which is connected to the base of the power transistor 171, 172° 173 which drives the motor tiles LO2, LO3, LO4 in the drive circuit 118, and resistors R26, R27. , R28.

Furthermore, base resistors R23 and R2 are connected between the bases and emitters of the power transistors 171, 172, and 173.
4 and R25 are connected to each other. As the rotor of the motor rotates, the Hall elements 180, 181, 182
are turned 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.
76.177, and the output of the speed switching gate is connected through an OR gate 178 to the FG 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 840 and its inverted output. Therefore, when 840 is at a LOW level, the switching gate 177 is enabled and the output of 01 of the frequency division counter is input to the FG of the PLL control IC 167, and when 840 is at a HIGH level, the switching gate 177 is enabled.
6 becomes valid and the output of the frequency division counter 175Q2 becomes PLL.
The FG large input of the control IC 167 is input. Here P L
Briefly explaining the input/output signals of the milJ mIC167, the P/S terminal (PLAY/5TOP) stops when it is at HIGH level and starts when it is at LOW level.

In the case of HIGH level, the outputs of both terminals of AGC and APC become 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 rC, 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. 8FC is the output of the motor speed control system, the output of the 8-bit D/A converter inside the PLLIC, and the AP
C is the output of the motor phase control system and is the output of the 8-bit D/Δ converter inside the PLLIC. Also PLLIC167
XOl connected to is a crystal sensor for generating a reference frequency, and GOl and CO2 are oscillation converters.

The output terminals of AFC and APC of the Pl control IC 167 constitute an adder circuit with resistors R12 and R13, and an operational amplifier 16.
It is connected to one side input terminal of 8. operational amplifier 168
A voltage obtained by dividing +12V by resistors R14 and R15 is applied to the + side input terminal of the switch. Further, a negative feedback circuit is formed by the resistor R16 and the capacitor 003, and the capacitor C03 in particular functions as a low-pass filter. Therefore, the amplification degree of the operational amplifier 168 is such that it has a characteristic of attenuating inputs having a certain frequency or higher. operational amplifier 16
The output of 8 is a pulse width modulation switching regulator I.
It is connected to the ten input terminal of C169. 169 is a commercially available pulse width modulation switching regulator IC.
It is. This IC 169 and power transistor 170. Diode DO1, coil 101. Together with the capacitor CO5, it constitutes a down switching regulator circuit. In the input/output of IC169, one terminal is a comparison reference voltage terminal, and the reference voltage output terminal VREF inside IC169.
A reference voltage obtained by dividing the voltage by resistors R17 and R18 is applied. DEADTIME#a regulates the maximum pulse width of the output, and the VREF is connected to the resistor R19,
A voltage divided by R20 is applied. C1,
02 is an output terminal, and depending on the voltage value of the input terminal,
Pulse width changes. That is, if the + side input terminal voltage is lower than the one side input terminal voltage, 01. The path width on the LOW level side of C2 becomes smaller, and the width at which the power transistor 170 is turned on also becomes smaller.

Therefore, the voltage across the capacitor CO5 also becomes smaller.

Moreover, if the + side input terminal voltage is higher than the one side input terminal voltage, 01. The pulse width of C2 increases, and the voltage across capacitor CO5 also increases.

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

When the rotation start signal S42 of the scan motor 312 becomes LOW level, AFC and AP of the PLL control IC 167
Since the Ryokawa power of C is at LOW level until the aforementioned lock signal $41 is output, the operational amplifier 168 outputs a HIGH level voltage. Therefore,
The output pulse width of the regulator IC1d9 becomes large, and the voltage across the capacitor CO5 becomes about +16V. Since any one of the Hall elements 180, 181.182 is turned on at the position where the rotor of the motor is stopped, the Hall element 180, 181.182 of the motor coils LO2, L03.104 is turned on. The corresponding coil is excited and the scan motor 312 starts rotating. The scan motor 312 then speeds up its rotation. Since the level of the speed control signal line 840 is now HIGH, the Q2 output of the frequency division counter 175 is
It is added to the FG input terminal of C167. Therefore, the frequency division counter 175 functions as an 8 frequency division circuit. When the frequency of the signal applied to FGIN reaches approximately 96% of the reference frequency inside the PLLIC169, the lock signal LD841 becomes HIGH, and the AFC and APC output levels are not fixed to Low level (O), but are set to the PLLIC internal D/A controller. is switched to the output voltage of the 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, the rotation speed is approximately 12,000 rpIt during printing operation, that is, during high speed rotation, and approximately 6000 rpIt during standby.
There is an rpmr.

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 body 259 that emits light, and a monitoring photodiode 260 that is a light detection means for monitoring the output beam intensity of 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 the base of the transistor 258, which is a current limiting resistor. 254, 255, 256 are laser diodes 259
These are high-speed analog switches for modulating the train (D) and first (S) when a HIGH level voltage is applied to the gate (G).
The resistance between the two becomes low and the ON state is reached. When a LOW level voltage is applied to the gate (G), it becomes high resistance and turns OFF.
become a state. The output power of the laser 259 has three levels in this laser printer. The first is the output P('ON) for almost completely removing the electrical charge on the photoreceptor 301 in the area corresponding to the white background on the paper.
By turning on the analog switch 254, the laser diode 259 becomes the output P (ON).

The second part corresponds to the black background on the paper, and is located on the photoreceptor 301.
In order to leave the above charged charge as it is, the analog switch 2 is in the output ``0'' state, that is, the output P (0'FF).
By turning on 56, the laser diode 259
becomes output OFF, that is, P(OFF). The third is the printing of one dot line I! with the output P (SH) between the first output P (ON) and the second output P (OFF). ! By turning on the analog switch 255, the laser diode 259 outputs the output P(
SH) (the details of P (Sol) will be described 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, 25
5,256 gate drivers. CO9, C10
, C11 is a speed-up capacitor, R47,
R48 and R49 are the gate drivers 249 and 250
, 251 input resistance.

246 is a 3'N A N D gate, and when all three gate inputs are at HIGH level, the output is LOW.
level and turns on the analog switch 254,
The laser diode 259 enters the output P (ON) state. The first of the three input gates is the inverter 253
The input of the inverter 253 is connected to the output of the print data signal 547 (L to be printed at the 1-11GH level).
(does not print at OW level). The second is connected to the output of inverter 252 and is connected to the output of inverter 252.
The input of No. 2 is connected to a shadow signal 848 (shadow on at HIGH level, off at LOW). The third is connected to a laser enable signal 849 (laser enable at 1-1fGH level, laser forced OFF at LOW). Therefore, the conditions for the output of the NAND gate 246 to be at a LOW level are that the laser enable signal S49 is HIGH, the shadow signal 848 is LC)W, and the print data signal 347 is LOW. Next 247
is a 3NAND gate where all three gate inputs are 1)
1G) When the output becomes LOW level, the analog switch 255 is turned on, and the output becomes LOW level.
The diode 259 enters the output P(SH) state. 3
The first of the two input gates is connected to the shadow signal 848, the second to the output of the inverter 253 which is an inverted signal of the print data signal S47, and the third to the laser enable signal 849. Therefore, the N
The conditions for the output of the AND gate 247 to be LOW level are that the laser enable signal 849 is HIGH, the shadow signal 848 is 1-11 G l-1, and the print data signal S
It was 47th and it was OW. Next, 248 is a 2OR gate, and when one of the two gate inputs becomes IOW level, the output becomes LOW level, turns on the analog switch 256, and laser diode 259 turns 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 846. 237 is an operational amplifier with FET input, which constitutes a voltage follower circuit. 003 is a Zener diode that regulates the output of the 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 007 at a constant rate. 236 is an analog switch whose gate (G) is connected to a buffer 244, and a sample signal 845 is input to the input of the rebuffer 7244. 253 is a transistor for level conversion, and R39 functions as a current limiting resistor when charging the capacitor CO7. R38 is the base current limiting resistance of the transistor 235;
A comparator 234 is a comparison means, and this comparator has a hysteresis characteristic due to the action of resistors R34 and R3'5.

The output voltage of the laser monitor amplifier 232 is applied to the input terminal of the comparator 234 through the resistor R34. 232 is a laser diode 259
This is an amplifier for the output of the photodiode 260 that detects the optical output from the photodiode 260, and serves as current-voltage conversion means. Resistors R32°R33 and VROI are resistors that regulate the amplification degree of the operational amplifier 232. Therefore, by changing the volume VRO1, the amplification degree of the operational amplifier 232 can be changed. R31 is an output load resistance of the photodiode 260 in the semiconductor laser 344, and a voltage proportional to the output current of the photodiode 260 is obtained. FIG. 19 shows the relationship between the short circuit current Is and the optical output PO of the photodiode 260. Is Is a monitor in Figure 19? ! 1. PO indicates the optical output of the laser diode 259. Said P(ON)
The output of P (SH) is approximately (3mW), the output of P (SH) is approximately 4RI
W1P (OFF) is set to O. Also LA-A, L
A-B represents two types of laser diode monitor characteristics. Normally, the volume VROI is adjusted so that the output voltage of the operational amplifier 232 is about 3V when the laser diode optical output is 6 mW. Therefore, the characteristics of both graphs LA-A and LA-8 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 2.0V in this case) is applied to the side.

Therefore, the laser diode 259 emits light, and its output changes from a LOW level to a HIGH level at approximately 2++w bells, and a laser ready signal 843 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. Voltage follower 23 above
9, analog switches 240, 241, main exposure adjustment volume 360. Resistor R45, exposure adjustment volume 3.61. The resistor R46 constitutes a light output setting means. Further, a circuit that compares the voltage detected by the monitor photodiode 260 and amplified by the monitor amplifier 324 with a set voltage by the comparator 234, and integrates the comparison value is called an optical output stabilizing means.

The analog switches 240 and 241 are switched by a main exposure setting signal 844. That is, when the main exposure setting signal S44 is at a LOW level, the output level of the inverter 242 becomes a HIGH level, and the analog switch 241 is turned on. Further, when the main exposure setting signal 844 is at HIGH level,
The output of the buffer 243 becomes HIGH level and the analog switch 240 is turned on. Also, analog switch 2
40,241 output (S side) is voltage follower 2
The output S50 of the voltage follower 261 is also input to the voltage follower 261 to correct the threshold 1 hold level of the horizontal synchronous pulse detection comparator of the beam detection circuit, which will be described later.
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 the laser diode 344 is 0℃,
Same <TO=25℃, when case temperature is 25℃, TC=50
°C is the IF-PO characteristic when the case temperature is 50 °C. Taking the characteristics of case temperature TC=25° C. as an example, when the current IF flowing through the laser diode 259 is increased sequentially from 0, the optical output PO starts to be output from a point of about 50 mA. Then, at the point IF=68mA, the above P(
ON) optical output is 6II1w.

Therefore, even when TC=O°C, the optical output po starts to be output at a point of about 40 mA, so by turning on the transistor 258, the bias current 1' is always set when the laser enable signal 349 is at the HIGH level. FB is supplied to reduce the power loss of the laser modulation transistor 257. 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 of lF25 - IFB should be less than lF25.Compared to directly driving the current with transistor 257, the light intensity stabilization will be described later. The accuracy of the movement can be improved considerably. 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. In this laser light amount stabilizing circuit, the light amount from the laser diode 259 is detected by the monitor photodiode 260, and the short circuit current 1s of the photodiode 260 is controlled so as to always be a constant amount. This is because, as is clear from Fig. 19, the monitor short circuit current ls and the laser diode 25
Since the optical output PO of 9 is in a perfect proportional relationship, if the monitor current Is 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 FIGS. 17 and 20.

In Fig. 120, when the laser enable signal S49 and the sample signal S45 both become HIGH level, the first
The transistor 258 in Figure 7 is turned on, and the resistor R5'1
A bias current (approximately 30 mA) flows through the laser diode 259 through the laser diode 259.

Also, at this time, both the print data signal 347 and the shadow signal 34B are at the OW level, so among the gates 246, 247, and 248, the inputs of only the gate 246 are all at the HL IGH level, so the output is LOW.
W level becomes analog switch 254, '255.2
Among the switches 56, the analog switch 254 is turned on.

Furthermore, when the sample signal S45 becomes 1-11 G +1, the analog switch 236 is turned on. At this time, the capacitor CO7 is not yet charged, so the output of the operational amplifier 237 is OV, and the base of the laser modulation transistor 257 is also OV.
becomes. Therefore, at this point, the diode 249
Only the bias current flows through the laser diode, and the laser diode does not emit light, as can be seen from the characteristics shown in FIG. 18'.

Photodiode 26 for monitoring laser diode
Since the laser is not emitting light at 0, the monitor current is 1.
s is O, and the output of the operational amplifier 232 is OV.
is being output, the output of the comparator 234 is LO.
The level becomes W level, and the transistor 235 is turned off.

Since the transistor 235 is OFF, the capacitor C0
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 the laser modulated river transistor 2
As the base voltage of 57 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 sum current IF of the bias %tilFB from the transistor 258 and the current 1c from the transistor 257 flows through the laser diode 259. Then, when the current 1c increases and the forward current IF of the laser diode 259 reaches about 50 mA (TC=25° C.), 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 ten input terminals of the operational amplifier 232 increases, and the output voltage is also a value obtained by amplifying the input voltage. Output. Since the amplification degree of the operational amplifier 232 is adjusted in advance by the volume VRO1 so that the output voltage of the operational amplifier 232 is approximately 0.5V with respect to the output imw of the laser diode 259, the optical output of the laser diode 259 increases to approximately 21L. When the output voltage of the operational amplifier 232 reaches approximately 1V, the comparator 23
The output signal of 8, that is, the laser ready signal 843 is LO
It changes from W to l-110H level. The main exposure setting signal 84 is input to one side input terminal of the comparator 234.
4 is at the LOW level, a shadow exposure level (light output P(SH)) voltage is applied 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. Assume now that the voltage is 2.0 cm, which corresponds to an average value of optical output of 4 nw. Therefore, the optical output of the laser diode 259 increases, and the voltage at the input terminal of the comparator 234 increases to 2.0.
When the voltage exceeds V, the transistor 235 is turned on and the capacitor CO7 is discharged through the 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+.
It becomes less than w. The optical output of laser diode 259 is 4
When the voltage becomes less than aw, the voltage at the + side input terminal of the comparator 234 also becomes less than 2.0V, and the transistor 235 is turned off again.

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 4IW, and the comparator 234 repeats the 0N10FF operation at a constant cycle. In addition, since this comparator 234 has hysteresis characteristics, comparison judgment becomes stable.
Be able to make reliable judgments. And the resistor R3
9 and R40, the voltage across the capacitor CO7 approaches the value of vOl in FIG. 20 and becomes stable. After the laser ready signal 843 becomes HIGH level, the microprocessor 101 outputs a shadow level sample strobe signal 846 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 01 (FIG. 20) of the capacitor CO7 input to the ALOG-INPtJT input terminal is sampled and held, and the voltage is stored in the hold capacitor CO8. Therefore, the control voltage V for outputting the shadow level P (SH) is applied to the output 0LJT of the simulated sample hold IC with the sample strobe signal turned OFF.
O1 continues to be output.

Next, when the sample and hold operation of the shadow level P (SH) is completed, the microprocessor 101 switches the main exposure setting signal $44 to the IIGH 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 240. 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 outputs a voltage of 3.0V, which corresponds to the average value of light output 6#lW. It is assumed that Therefore, the output of the comparator 234 becomes LO due to the input terminal on one side being switched to 3.0■.
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. And the optical output of laser diode 259 is 6n+w
When the voltage reaches approximately 3V, the output voltage V232 of the operational amplifier 232 becomes approximately 3V. When the output voltage of the operational amplifier 232 becomes 3V or higher, the output of the comparator 234 changes to 1-11 Gl-1, the transistor 235 turns on, and the capacitor CO7 connects to the resistor R.
40. Therefore, the base voltage of the laser modulation transistor 257 also decreases, and the optical output of the laser diode 259 becomes 6IIIW or less.

When the optical output of the laser diode 259 becomes 6mW or less, the voltage at one side input terminal of the comparator 234 also becomes 3.0V.
]-The transistor 235 is turned off.

Then, capacitor CO7 is charged up again through resistors R39 and R40, and laser diode 259
The optical output is 6mW or more.

In this way, the optical output of laser diode 259 is 6111
The comparator 234 repeats the 0N10FF operation around W at a constant cycle. And the resistors R39 and R
Due to the integral effect of 40, the voltage of capacitor CO7 approaches VO2 in FIG. 20 and becomes stable. 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, comes, and outputs the sampling signal S45 only in a portion other than the print data writing operation, that is, in the section 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 25 is activated by the print data D47 and the shadow signal 848.
9 is a laser diode 259 in the printing area to be modulated.
The optical output level of P (ON), P (
Sl-1), P ('0FF) (7) 3') (7) t,
'Become a bell. 1', that is, the first is the print data signal S47
is OFF, 'fl is LOW level and the shadow signal is 0f-F, that is, LOW level (white output for printing), the NAND gate 246 is established, only the analog switch 254 is turned ON, and the modulation transistor 257 is turned on. The main exposure level voltage VO2 is applied to the base, and the optical output of the laser diode 259 is P(O
N>=6 mw. The second is that the print data signal S47 is O.
When the FF and shadow signals are ON (the printing output is halftone), the NAND gate 247 is established, only the analog switch 255 is ON, and the base of the modulation transistor 257 receives the output voltage VO1 of the sample and hold IC 245. is applied, and the optical output of the laser diode 259 becomes P<SH)-4 mw. Third, the print data signal S47 is ON and the shadow signal is OFF.
In the case of F (the printed output is black), the OR gate 248 is established and only the analog switch 256 is ON.
becomes. Therefore, the base of the modulation transistor 257 is G
Since the light is shot to ND and becomes 0■, 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 (8H).

Therefore, the voltage at one side input terminal of the comparator 234 becomes 2.0V, which is the setting voltage for the shadow exposure level. Therefore, the transistor 235 is turned on and the capacitor C
07 is discharged and VCO7 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 8T 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 a voltage Δ corresponding to the above ΔIF, which is lower than the first set voltage VO1.
■The optical output of the laser diode 259 is set to VO3 higher by 1, and the optical output of the laser diode 259 is the same as the first setting P (SH) = 4
mw. Then, like the first time, the sample and hold IC 245 is triggered by the sample strobe signal S46.
The shadow exposure level P (ON) is set. At this time as well, the operation corresponds to the rise in temperature of the case of the laser diode 344, and the voltage of the capacitor CO7 is set to VO4, which is higher by the temperature-dependent correction voltage ΔV2, and after setting, printing is performed on the second row of the cylinder. In this way, the shadow exposure level P (SH) and the main exposure level P (ON) are maintained at a constant level very accurately by the function of the stabilizing circuit, so that high quality printing can be performed. As mentioned above, the main exposure level P (ON> is set to perform a light amount stabilization operation to keep the light output constant at all times except when writing print data. Also, the shadow exposure level is adjusted for each print. A sample hold operation is performed before printing starts, and the light amount stabilization operation during the print writing operation is not performed like the main exposure level.This makes the circuit complicated and expensive, and the main exposure level This is because the shadow level is auxiliary compared to level fluctuations, and even if it fluctuates a little, it does not have much of an effect on print quality.The settings to be input to the comparator 234 according to the sensitivity characteristics of the photoreceptor 201 When varying the voltage, adjust it by varying the main exposure setting volume 360. This main exposure setting volume 360 is designed to vary the input voltage of the voltage follower 239. Therefore, this main exposure setting volume 36
The optical output setting voltage at P (ON) can be adjusted by varying the value of 0. On the other hand, the optical output setting voltage at P(S!-1) is obtained by dividing the output voltage of the voltage follower 239 by the resistor R46 and the shadow exposure setting volume 361. Therefore, by adjusting the main exposure setting volume 360, when P<ON), P(St-1)l
II7) The optical output setting voltage changes proportionally, and a constant relationship between recording density and applied voltage can be maintained. Therefore, the adjustment becomes simple without requiring the complicated operation of varying and adjusting the set voltages for both P(ON> and P(SH) times as in the prior art).

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

In FIG. 21, 346 is a beam detector which 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 due to 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 to one input terminal of a high-speed comparator 262, which is a comparison means, through a load resistor R5,2 and a resistor R55. Further, a voltage divided by resistors R53 and R54 is applied to the + side input terminal of the comparator 262 through a resistor R56. Further, a capacitor C12 for noise removal is connected in parallel to the resistor R54. Further, R57 is a positive feedback resistor for providing hysteresis characteristics, and C13 is a feedback capacitor for applying high-speed feedback to improve the output waveform. Further, a variable threshold voltage 850 is applied to the + side input of the comparator 262 through a diode D40° and a resistor R57. This threshold variable voltage 850 is the output of the analog switch 240 or 241 (output of the optical output setting means) (see FIG. 17). FIG. 22 shows the relationship between the one-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 laser beam passes over the beam detector 346 at high speed, a pulse current flows from the beam detector (PIN diode), and the waveforms a and b in FIG. 22 are input to one input terminal of the comparator 262. Now the comparator 262 -
1-Personal power terminal voltage is threshold variable voltage 8
Assuming that a low voltage VO6 is always applied because 50 is not applied, the output waveform of the comparator 262 will be the output waveform shown by the dotted line in the case of waveform a, and the output waveform shown in the solid line in the case of waveform A. . Here, waveform a indicates a case where the sensitivity of the photoconductor 301 is low, and the laser output during the main exposure is 6 mW or more, and conversely, a waveform a indicates a case where the sensitivity of the photoconductor is high and the laser output is 5+++W or less. As can be seen from this output waveform, the comparator 262
When the + side voltage of is kept constant, the output waveform is beam detector 3
It changes significantly depending on the amount of light incident on 46. Therefore, by using the variable threshold voltage 850 to correct the voltage of VO5 when the light intensity of the laser beam is large and the voltage of VO6 when the intensity of laser beam is small, the output waveform is kept almost constant as shown in Figure 22. It is possible to maintain the

FIGS. 23(A) and 23(8) are configuration diagrams of the beam detector (PIN diode) 346. Figure 23 (A), (
In B), 410 is a light receiving element, 411 is an electrode wire, 41
2 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 photodetector shape of 2.5 x 2.5 m11. Response time 4 n5ec
belongs to.

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

FIG. 25 is a detailed circuit diagram of the print data write control circuit 119 in FIG. 13. The main functions of this print data write control circuit 119 are as follows:
The parallel print data 857 is serially converted to be written in a predetermined area on the photoreceptor 301 according to the size of the paper to be printed, and is 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 the output from the print data control section 2 is sent to the interface circuit 122. The other is to generate test printing patterns necessary for maintenance.

In FIG. 25, reference numeral 186 denotes an input/output port for transmitting and receiving signals necessary for control within the laser modulation circuit 120 and the print data writing control circuit 119, and 187.
A counter/timer 188 controls the writing position of print data, test pattern generation, laser light output sampling, and the like. 189 is a crystal oscillator that serves as the reference clock for the image clock pulse and has an oscillation frequency of approximately 32M.
1-IZ. Reference numeral 190 denotes a circuit for generating an image clock, which generates a pulse (approximately 8M) lz) corresponding to the minimum modulation unit of one dot of a laser beam. 191 is a control counter for serially converting print data in bytes (8 bits) received from the interface circuit;
2 is a circuit that generates a test pattern used during maintenance (when this circuit is selected, a test print is performed and the various adjustment switches mentioned above are adjusted); 211
is test pattern data and interface circuit 122
a multiplexer for selecting between different print data; 21;
0 is a shift register 213 that converts the 8-bit parallel data from the multiplexer 211 into serial data;
214 is a line memory for temporarily storing print data and has a memory capacity of 4096 pits; 212 is an address counter for the line memories 213 and 214; and 215 is a decoder for generating a signal for controlling the test pattern generation circuit. Reference numerals 226, 227, and 228 are flips 70 for synchronizing the timing of sending print data and shadow data.

Here, the details of the counters 187 and 188 will be explained. 275 is a counter that determines the timing for correcting the amount of laser light for each line (horizontal scanning line), and counts based on the reference zero count signal S53, and generates a sample signal 875 used for correcting the amount of light and starting the line. . A counter 276 for determining the horizontal recording start position 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 M (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 883, and outputs a data write end position (write margin) signal 885. Reference numeral 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 is powered by two people, the paper leading edge position (page top) signal 874 output from the input/output boat 186 and the Q output of the flip 70 knob 204. is performed, and page top counter 1 to output 876 are generated.

279 is a vertical recording end positioning counter which counts based on the output of the gate 198 as described above and outputs a page end count signal S77. 280
is a vertical test pattern control counter which performs counting based on the Q output of the flip 70 knob 240 and outputs a test pattern control signal 879.

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

265 is a transceiver/receiver for the Inter 7Ace data bus 859. Reference numeral 266 indicates a decoder for the data selection signal 860 that specifies data on the data bus 859, and 269 indicates a control circuit for the BLJSY signal that controls the data sending timing to the data control unit 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-pit data bus, and S60 is a data selection signal rID on the data bus 859.
Data on the data bus 859 is selected by a combination of two signals COM and ID5TA. 861 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, S63 is IPE
Upon receiving this signal at ND, the data control section 2 side stops sending out the print data.

864 is IH8YN, a request signal to send one line of print data, S65 is IPRNT, a print start command signal, S
30 is a strobe signal for commands and print data, abbreviated as l5TB, and 366 is IBSY, which is the strobe signal S.
30 transmission permission and status data data control unit 2
This is a signal that allows reading on the side.

Commands and print data are sent to transceiver/receiver 26
The status identification signal 868 is output to the output line 872 of 5.
It is output when it is FF. Data on output line 872 is transferred to data latch 264 by strobe signal 830.
latched to. In the case of command data, the data is latched to the input/output port 263, and after the command is identified, the specified operation of the command is executed. In the case of print data, it is sent to the print data write control circuit from the output line S59. Also, the status data is sent as follows. By receiving a status request command on the print control unit 100 side, the status contents corresponding to the command are let to the status data output 871 of the input/output boat 263. The set status data S71 is input to the transceiver/receiver 265. The input data is output onto the data bus S.59 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.

PSON is a power save command that reduces the power consumption of the fixing device 331, and PSOF is a command to cancel the power save state.When not recording, the power save command PSON reduces the power consumption of the fixing device 331 to save power and record. Sometimes power save cancellation command P
The SOF allows the power to be increased to normal values to fix the toner. C3TU is a cassette upper stage paper feed specification command, C3TL is also a lower stage specification command,
VSYNC is a command that instructs the data control unit 2 to start sending print data, MF'1' to 9 are manual feed mode designation commands, 78M1 to 4 are top/bottom margin designation commands that designate the print start position on the paper, S.O.F.
indicate commands for forcibly turning off shadow exposure.

In FIG. 28, during paper conveyance, the status indicates that paper is being fed and the paper is being conveyed into the printer, and the select switch O'N is the select switch 35 of the operation unit.
The status indicates that 4 has been pressed, the VSYNC request indicates that the print control unit 100 has received a command to start printing and it is now possible to receive print data, and the manual feed indicates that the paper feed mode is in the manual feed state. The upper/lower cassette status indicates the status of the selected cassette in the cassette feeding mode.
Top/bottom margin indicates the status of the top/bottom margin selected by the top/bottom margin command (78M1-4) 1 status, cassette size (upper row) and cassette size (lower row) indicate the installed caret. Status indicating the size code of , Test/Maintenance indicates the test/maintenance state, Data retransmission request indicates the need to reprint due to a jam, etc. During Wait, the printer is in the warm-up state of the fuser. The status indicates that the power save mode is activated by the power save command (PS'ON>).The operator call status indicates that the A 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 bag replacement indicates that the toner bag is full of toner. Paper jam indicates that paper has jammed inside the machine. No Toner indicates that there is no more toner in the toner hopper. A cover oven indicates that the front door is not closed. A timing error indicates that there was a problem in transferring print data. A fixing device failure indicates that there is an abnormality in the fixing device, such as a fuser heater disconnection or a temperature FLISE outage. □Laser failure indicates that the laser diode does not reach the specified output power or that the beam detector cannot detect the beam. 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 fixing roller counter shown in FIG. 15 has reached a specified value and that the fixing roller needs to be replaced. Drum replacement similarly indicates when the drum replacement counter reaches a specified value and the drum needs to be replaced, and developer replacement similarly indicates when the developer replacement counter reaches a specified value and the developer needs to be replaced. .

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 from the beam scanning starting point 416 to the next one at time 0 by the next cape 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 scanning 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 the distance Each represents the distance to the writing end point of A3 size paper. 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. (19 and dlO indicate the effective printing range for A3 and 80, respectively.As is clear from this drawing, the paper feed of this printer is always centered around the paper center point 427, so depending on the size of each grade, the paper is moved from the beam detector position 418 The starting point for printing is different, so the beam detector 346 is adjusted according to the paper size.
Data must be written after a lapse of time corresponding to the distance from when the beam is detected to each writing start point. Instead of performing such control, this printer does not employ a paper edge feeding mechanism, so it is possible to print on the entire surface of the paper. In this embodiment, the left and right margins on the left and right sides of the paper are set to 3IIIIIIl, but it is possible to set them to 0. Furthermore, conventional printers that perform edge-feed conveyance usually require a margin of about 8 to 10111111, which has the disadvantage that a considerable 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 A6 paper and 437 represents A3 paper. 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 data writing end point of the A3 size. 434 represents the trailing edge of the XX size paper, and 435 represents the end point of data writing for the XX size.

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

Ready signal IPRDYO (861) of print control unit 100
becomes ready for printing.

At the same time, the print start signal IPREQO (862) becomes active. Next, the laser enable signal LDON1
(849) rises to 1'. This signal 849 causes the first
The transistor 258 shown in FIG. 7 is turned on. At this time, the data flip 70 tabs 226 to 228 in FIG. 25 are not set, so the print data signal 847 and shadow signal 848 are both 0'. Since the laser enable S49 is "1", the print data is O', and the shadow signal 848 is 0', the gate 246 in FIG. 17 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 the laser ready signal LRDY1 (843) is generated.Next, the counter 275 is activated in synchronization with the horizontal synchronizing signal H3YO (S54).
A sample signal SMPTO (375) is generated from. This signal 875 is used to set the time corresponding to the distance d3 (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 875 opens the gate 193 in FIG. 25, a sample signal 845 is generated from the gate 194, and this sample signal S45 passes through the gate 244 in FIG. 17 to the analog switch 236.
Since the correction signal is turned on, the correction signal is transmitted to laser diode 2.
59, and the light amount correction for each line is thus performed. PTCTO<576) is an output signal of a counter (page top counter) that determines the leading edge of the paper, and °PECTO (877) is an output signal of a counter (page end counter) that determines the end position of the paper. When it is time to write the image, VSYNC
Send request status to external device. Due to the stiffness, a VSYNC command is issued, and when it is received, PTOP
(873) appears and start counting the number of H8YNC lines from that point. In the same way, how many lines should you write from that position? (
Specify the end position). In order to be able to change these specified values, the top margin nT and the holatum margin nE are
is provided. When the above specification is made, V
When SYNC is received, a PTOP signal is output before the leading edge of the paper. For example, if 5 square margins are required, count the number of lines including them.

If the top margin is 1011IIll, 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. The gate 201 in FIG. 25 determines where to write in this way. LSTO (378) is the Q output of the 7-lip flop 204 for synchronization, is set by H8YNC, and is reset when the sample timer signal rises. This reset line is included in the LDON signal (S49) in FIG. 25, and normally does not work, but is forced to be reset. The reset generates the Q output of the flip 70 tube 204, 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 S82 and 387 with different phases. As a result, synchronization for -lines is achieved. VDATl is a print data signal (847), which is output as serial data by the operation of the P/S conversion shift register 210. That is, P/S conversion shift register 2
10 is operated by the signal S82 from the clock generation circuit 190, but when the load signal is not applied, the output 88
6 is 0' (no laser writing), and when the load signal 888 is input, data D5 to D12 are serially converted and output.

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

When there is a place to actually write, data must be set every time the paper size changes, but the counter that controls this is the left margin counter 276 (Fig. 25).
The data is 69 in Figure 29. dlo) and write margin counter 277 (data is d11.d12 in Fig. 29).
). In this case, the setting defines the distance between the left and right sides based on the center of the paper. H8Y
When the LST signal (S78) is output in synchronization with the NC signal, the 7 lip-flop 196 is set, which causes the gate 1
98 flashes and the counter 276 starts counting.

In this case, the video clock is not counted bit by bit, but once every 8 bits. When the count output output from the 8-bit stone is set in accordance with the left margin N[m1 and the right margin NRm, counting is performed in synchronization with the LST signal (878). Then, when you set it and output the count number, it will stand up. Therefore, the gate 201 determines the vertical direction, and the gate 199 determines the horizontal direction, so that the point when both gate outputs become (1, 1) is refined. At this timing, the load signal is output, and the data S86 is serially converted from the shift register 210 and sent out.

Line memory out signal LMOT (S80) is the output of OR gate 222. This controls which data from the line memories 213 and 214 is to be sent. That is, this sending timing is
Controlled by 03. That is, the output state of the flip-flop 203 changes every time a clock pulse is applied, and the gates 220 and 221 are opened alternately, so that the output DOLIT of the line memory 213 or 214 is alternately read out. line memory 21
The writing timing to 3,214 is also the gate 217.2.
18 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, if the laser is not emitted over the entire axial direction of the photoreceptor 3o1-, for example, a small size paper (B5 paper such as the paper 458 shown in FIG. 43)
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 such an area is provided where toner does not adhere for a long period of time, there is a problem that when the blade scrapes off the adhered toner after recording, the contact resistance of the blade in the unadhered area becomes large and the surface of the photoreceptor is scratched. be. So with this device. As shown in the time chart of FIG. 31, immediately after printing for one sheet of paper is completed, a line data on signal is issued to generate 0AONI (881), and within this generation period, the print data signal vDAT1
(S47) is forcibly applied, and by this operation, lines (images) 460 and U463 spanning the entire axial direction of the photoreceptor as shown in FIG. 43 are written after printing for one sheet of paper is completed. This eliminates the above drawbacks. In this case, the line data write timing is determined by the line memory out signal and the data LDAT one step before the final stage data LDATn in the data of MOTl (880).
The signal is generated when a predetermined time tx has elapsed from the falling edge of n-1. Note that such a line i is not necessarily limited to one that is written periodically after each sheet of paper has been printed, but is printed on a lot basis (for example, every 10 sheets or
You may also set it so that it is written for each page).

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 848 is made by various gates 220 to 225 which alternately input the data of the line memories 213 and 214, and three 7-lip 70-tubes 2.
26 to 228 and the gate 231 on the output side thereof. Among them, the flip-flop 227 is in the horizontal direction (
The flip 70 knob 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, the serial data to be written is read out from the line memory 213 and is stored in 7 lip 70.
If you let the knob 226, the data in the previous line direction is in the 7 lip 70 knob 227, so for example, when the current data is O' and the previous data is 1', the shadow signal 848 is output. be done. Similarly, the data of the previous line and the data of the current line are compared at the gate 223, and for example, when the data of the current line is O' and the data at the same horizontal position of the previous line is 1', the knob 70 is set. and a shadow signal is generated. Note that a shadow signal is also generated when both flip-flops 227 and 228 are set. This state is represented by the shadow out signal 5OUTI (S86) and the print data signal VD in FIG.
AT1 (847), shadow signal 5DAT1 (84
8).

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

FIG. 36 is a characteristic diagram PA that intersects vertical line S1 and horizontal line S2 and shows the relationship between exposure position and exposure energy in the upper right area of the figure.
T1. P'AT2 is shown in a characteristic diagram Q showing the relationship between the surface potential of the photoreceptor and exposure energy in the upper left area of the figure, and characteristic diagrams R1 and R2 showing the relationship between the exposure position and the surface potential in the lower left area of the figure.
are shown respectively. In this figure, among the characters in Figures 33 and 34, in the X direction r8J and in the Y direction "1"
4 to 21''. As shown in the figure, the characteristics PATI and R1 of the pattern shown in FIG.
The characteristics PAT2 and R2 of the patterns shown in the figure are different. 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 Figure 4 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, 6 mw, and P(S) when creating a shadow part.
The energy of I) is, for example, 4s+w.

The above shadow method can be summarized as follows.

In a device that records recorded information (character information, etc.) on a recording photoreceptor by beam scanning in accordance with differences in beam intensity, serial binary input data is transferred to beams (with 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 between the intensity of (a ) It is determined that the binary data on the horizontal line changes from significant recorded data (data that does not contribute to 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 data portion 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 the flow is "Shadow J", and if it is text information, it moves to "Shadow JON flow", and if the For example, if the information is related to image information), I disable "shadow" and let it do it automatically. In this case, the ° command is rs, o'NF shadow 0N1 shown in Figure 27.
It is 0FFJ. Or on the panel [Shadow 0N]
A 10FFJ switch may be provided so that the operator can arbitrarily select.

If the above-described shadow method is used, if the recorded information is character information, a "shadow" can be added, thereby improving printing quality. Particularly during high-density beam recording, the printing density of one dot line decreases, which is a drawback of the conventional recording method using binary beam intensity.
Since "fading" can be prevented and, as a result, the printing density of one dot line is increased, the printing quality can be improved even for a high-dot Kanji font such as a 40x40 dot configuration. In addition, since the permissible range of the vertical direction of the beam on the photoreceptor due to the vibration of the polygon mirror can be widened, the polygon mirror is easier to process and has the advantage of being less expensive.

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 a configuration example of the charging high voltage power supply circuit 160, which is a high voltage power supply 0N10FF signal QS.
A voltage control circuit 445 whose operation is controlled by 35, a step-up transformer 446 whose frequency output is applied to the primary side by this voltage control circuit 445 and which 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 the analog control signal S36 and outputs 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 charging charger at this time is determined. Current/
The output voltage is applied to the voltage conversion circuit 450, and the output voltage is compared with the reference voltage by the operational amplifier 449, and a control operation is performed so that the two match, so that the output applied voltage can be stabilized.

Here, the contents of the analog control signal 836 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 ΔVO.
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℃.
This is a characteristic diagram showing the relationship between the drum inflow current ■D and the surface potential vO in No. 3, and 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 800 V for the drum with characteristic 451 in FIG. Inflow current change amount AID corresponding to O=
(Various characteristic data of the photoreceptor is stored in the RAM 107). Here, since the inflow current 10 and the output current have a corresponding relationship as shown in FIG.
The above-mentioned inflow current ID can be adjusted by changing 6 to 2V, 4V, . . . 6V. Figure 41 shows the analog input current (D/A converter 16 in Figure 15).
For example, the temperature of the drum 301 can be detected by the temperature sensor 342 (the thermistor shown in FIG. 14), and the analog control signal 836 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
A value DΔ■ is read by subtracting the drum temperature data DT25 at °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 DΔV. Next, read the reference data DV25 at a temperature of 25°C, calculate DV25 + DΔ■, and the calculation 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.<836
) and the control input signal S35 of the charging high-voltage power supply 160 is turned on to perform the 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 stored in the nonvolatile RAM 107 can be specified by the operator from the outside. That is, as shown in the flowchart ① in Fig. 60, when it is determined whether or not to replace the drum, if the drum is replaced, the test key is turned on by setting the drum characteristic No. to M107
The drum characteristic number is written in the drum characteristic number area. 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 defects such as fogging due to a decrease in print density, a decrease in print density, or an increase in charging potential, and it is possible to always provide clear prints. Further, in this embodiment, by inputting (external setting) information classifying the temperature characteristics of the photoreceptor, correction is performed accordingly, so that temperature correction of charging characteristics can be performed with extremely high accuracy. Therefore, variations in the temperature characteristics of the photoreceptor itself can be alleviated, and there is also the advantage that the range of specifications for the photoreceptor can be expanded.

Next, the flowcharts shown in FIGS. 47 to 56 and the flowcharts shown in FIGS.
The operation of the entire apparatus will be explained with reference to the time charts shown in FIGS. 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 issuing VSYNC, and timer B is for VSYNC.
The data reception is controlled from the generation of C to the data collection, and the timers 〇 and D are used to control from the start of data transfer to the stop of the registration motor, toner replenishment, etc., and the timer E is used to finish the data reception and control the stop sequence. be.

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 furthermore, it is 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 timer ATIMA counts a predetermined time t1, mechanical parts such as the drum motor and developer motor are turned on, and then TIMA counts a predetermined time t1.
When counting 2, the laser 344 is turned on. T.I.
When time t25 is counted by MA, it is determined whether the laser is ready or not, and if yes (Y), then TIM
When A=t26 is counted, the transfer charger, laser, developer motor, and developing sleeve bias are each turned off, and further, when the time 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 H8YNC 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 pack is replaced or not, and whether or not there is no toner. If the tray is full, the tray full flag is set to O' after paper is removed from the output tray, and the output tray counter is set. In the case of "toner pack replacement", the reset is performed when the state returns to its original state, and in the case of toner replenishment, the reset is also performed when the state is restored. 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 "Paper out" in "Status 4" is in progress. , if YES (Y), 1 power set paper out detection ON
J or not is determined, and if NO (N), the ``1 paper out'' flag is set to 0', and if the ``fixer is ready'', the ``Status Waiting'' flag is set to O'. Next T PRDYO
N, IPREQON, and it is determined whether "power saving" is in progress or "out of paper", and if there is no problem, ITMA starts. The registration motor 149 rotates in reverse at TIMA-tOl, 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 rlPREQ 0FFJ. Next, it is determined whether or not the timer E (TIME) is in operation, and if it is in operation, it is determined that rTIME=t30, and if YES (Y), TIME is stopped and the transfer shutter 305.
Peeling charger 306. Developer motor 141
．． Each of the fixing device motors 143 is turned on. rTIM
If E=t is not 30J, TIME will stop and O
The process moves to the flow shown in FIG. 48.

Next, TIMA starts and plaid solenoid 158
turns on, and when rTIMA=tIJ, the developer motor 14
1. Static elimination lamp 302. Pre-transfer static elimination lamp 303. Each of the drum motors 147 is turned on. rTIMA=t
Transfer charger 305.2J. The fixing device motor 143 is turned on.

The break charger 306 turns on when rTIMA=t3J, and then turns TIMA to 0 when rTIMA=t4J.
’ Start again. Next, it is determined whether the cassette is in the "manual feed" mode or not, and whether the cassette is in the upper or lower tier.
After reaching IMA=t-5J, the paper feed motor 151 is reversed to feed the lower paper. Next, the laser 344 is turned on when rTIMA=t 5J, and rTIMA=t 6
Charged Chi 1 when J? - Turn on the jar 304.

Check whether it is laser ready with "TIMA=17", and if yes (Y), rVs in "Status 1"
"YNc request" flag is set to 1'. After that, the timer B (TIMB> is started and the flow shifts to (2) (see FIG. 49).

Next, the paper feed motor 151 is stopped at rTl, MA=31J, and it is determined that the rVSYNC command has been received, and YES (Y
), determine whether IT IMB<t 32J,
If yes (Y), stop TIMB, start page 1, page end counter 1, start image writing process. Timer 〇, I) (T
lMC1D), rT'TMA=t34J
TIMA stop and paper feed motor 151 stop. Next, at rTIMc/D=t35j, the registration motor 149 rotates forward, the total counter 354 is turned ON, and rTIMO/D
=t36'' to determine whether the toner level 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 "Heat Roller Replacement" is selected, each status will be displayed. In addition, the determination result of "rVsYNc command reception" is as follows.
No (If N>, FTIMB=t46" turns off the charger 304, rTIMB=t47J turns off the laser 3.
44. Break charger 304 OFF, rTIMB=t
47J and laser 344. Hakuli Charger 306. Turn off each developer motor 141, IT IMB=t
Transfer charger 305.48J. Fuser motor 143
OFF, FTIMB=t49J, drum motor 147. Static elimination lamp 302. Pre-transfer static elimination lamp 30
3 are respectively OFF, and rTIMB=t50'', the plaid solenoid 158 is turned OFF.

Also, in the flow of rTIMB<t 32J, −(N>
If so, then it is determined that rTIMB<t 33J, and no (
N), TIMB stop and TIMA start. After that, turn on the plaid solenoid 158 and rT
At the stage of IMA=tlJ, the developer motor 141. Drum motor 147. Static elimination lamp 302. Pre-transfer static elimination lamp 30
3 are each turned ON. then rTIMA=t 2J
When the transfer telejar 305. Turn the fuser motor 143 to O.
N, and when rT and IMA=t3J, the peel charger 306 is turned on. Next, it is determined whether rTIMA=t4J or not, and timer A is temporarily stopped and restarted. The developer motor 141. Transfer charger 305. Hakuli Charger 306. Each of the fixing device motors 143 is turned on. At rT'1MA=t5J, the laser 344ON1. At rT rM=t 6J, the charger 304 is ON, at rTIMA=t 7J, it is determined whether the laser ready is not on, and if yes (Y), the TIM
Stop A (see Figure 50 above). 'Next, determine whether the toner full detection switch 126J is ON or not, and
If it is N, the display is performed, and if it is not ON, it is determined whether the toner out detection switch 125J is ON or not, and the display is performed. Next, it is determined whether it is "manual feed 1" or not, and if it is not manual feed, it is then determined that there is no paper in the specified cassette, 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 (TIME) is started. If the stop flag is “1”, 5TPF
Set to "0'" and turn off print ready IPRDY.
do. 5TPF = 1F [It is determined whether manual feed is 1J or not, and if it is "manual feed 1", TIME stop, manual stop switch 328 OFF, manual feed]
0', TrMB stop, cassette paper out detection switch ON or not is determined, and then the print request rPREQ is turned ON, and the flow shifts to (2) in FIG. 48 (see above in FIG. 51).

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

This determines whether or not each of the timers A, B, C, D, and E is in operation, and counts up when each one is in operation. Read all input information in the boat input reading section. Then, the timer is stopped at rTIMC/D=t38J, and it is determined whether or not rTIM'E=t39J. From then on, the operation of timer E (TIME) is continued, and the U toner replenishment motor 159J, r Stop the registration motor 149J. Then “TIME”
- After t4J, determine whether “TIMA is in operation” (
This is to determine whether the next sheet of paper will be printed). If TIMEA is in operation, TIME is stopped. After that, use "TIME-141" to turn off the charger 304.

rTIME=t 42J and laser 344. Hakuli Charger 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 defrosting lamps 303 are each turned off (see FIG. 52).

rT IME:=j 45J and plaid solenoid 15
80 F F,, TIME stop, "Determination of whether the fuser temperature is normal or not, [Fuser temperature fuse stage]", "Scan motor 312 ready", "Door switch 129O
A determination is made as to whether it is an FF, and various processes are performed depending on each state.

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", and if it is an error, the "status DATA81J flag becomes 1'," indicating an "illegal command error." If it is not a “parity error”, [status request] is S R1
, -6 is determined, 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 is determined whether it is [Top/Bottom Margin], and if so, [Top/Bottom Margin] is specified, the "Status Set" becomes "1', and rDATA21~ 11" 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, with the manual feed statuslet, the status becomes 1 and rDATA4. IJ flag is “1”
', then the flow shifts to status 4 where the paper out flag becomes 0'. If it is not "Manual feed specification", "
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, the status becomes 1, the DTA41 flag O', the cassette It is determined whether there is no paper or not, and if there is no paper, flag '1' is set.
becomes. If it is not "1 cassette specified", it is determined whether the "select lamp is lit" or not, and the online select lamp (specified by an external device, for example, the host side) is checked.
It is judged whether the light is on or not, and if YES (Y), the select lamp is lit, and if the select lamp is not lit, it is judged whether the select lamp is off. If so, move to the next flow.

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

In addition to the above-mentioned "shadow method", "power save" is included in FIG. 55(A), and if "power saving" is in progress, the scan motor 312 is turned off.

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 turned on, the fuser is controlled to the normal temperature, 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 5mm,
If the answer is NO (N), the top/bottom margin change table data D2 can be read. Next, the top margin table data D1 + margin change table data D2 are sieved, and the top margin adjustment switch (4 in FIG.
42) is 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 (DI102), and the calculation result D4 is set in the page top counter 278.

Then, the specified paper υ゛izbo[・mumargin Σ-pull data 1) 5 is read, and the 1 to tsubu/bottom margin specification is 5.
01m or not is determined, and if no (N), the top/
The bottom margin change table data D2 is read, the bottom margin table data D5 and the margin change table data [)2 are subtracted, the contents of the bottom margin adjustment switch 442 are read, and the top margin adjustment corresponding to the switch is performed. Table data D3 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 (standard) or not, and if it is not the upper stage, it is the lower stage.The content of the cassette upper/lower stage adjustment switch (Fig. 14, 44) is read, and the cassette upper/lower stage corresponding to the switch is read. Read adjustment table data D8. Said D
D8 is added or subtracted from the value of 7, and the calculation result D9 or 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 Figure 14) are read and the cassette/manual feed adjustment table data DIO corresponding to the switch is read.
is read, and then the adjustment table data D1 is set to the value of D7.
0 is added or subtracted, and 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 the upper row (reference) is wrong 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 012 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, the data DIO and the data [)12
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 IPREQφ (862) rises.

After that, the developing device motor 141 etc. are turned on, and from time t4 to
During t8, the paper feed motor 151 operates to transport 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 t11 when IPREQφ (862) falls, and after time t11, 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, but the registration motor 149 is rotated in reverse to drive the paper feed roller, and is used for paper conveyance, and the registration roller is driven by forward rotation. ing. In addition, both of them receive the print start command IPREQ after receiving the "manual feed command".
φ (862) 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, after that time t01
Afterwards, the registration motor 149 rotates slightly in reverse and stops with the leading edge of the paper added, and a "manual feed command" is issued.
At the time when PREQφ (862) rises, the registration motor rotates in the reverse direction again to convey the paper to the transfer position and then 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 field switch 326 is turned on after the paper is set in the manual guide after the [manual feed] cloak is first removed.In this case, the registration motor 149 is turned on after the predetermined time tO1 is continuously rotated in reverse to convey it to the transfer position. In both cases, the manual stop switch 328 is set to 0F.
Ft, after (time t20) time t2 after a predetermined period has elapsed
1, the registration motor 149 is stopped, so that a "jam" will not occur even if the paper set in the manual feed guide 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. usage will increase.

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

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

When the test print mode is selected, the flow shifts to (2), and the print specified by the print mode No. is executed via the test key. When the maintenance mode is selected, the process moves to the flow shown in ■, and the NO maintenance mode operation specified via the test key is executed.
When the replacement mode is selected, the flow moves to ■, where it is determined whether to replace the drum, whether to replace the developer, or whether to replace the heat roller, and to set the drum characteristic number for each.

``Developer Replacement NO Set'' and [Heat Roller NO Set J process predetermined data in the non-volatile generation RAM 107 via the test key.

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

(The following is a margin) [Effects of the Invention] As detailed above, according to the present invention, it is possible to accurately record on the medium from the recording medium manual supply means simply by specifying the size from the external device, so that the cassette Recording can be easily performed using exactly the same operations as in the case of .

Further, since the recording operation from the manual supply means can be simplified in this way, it is possible to accurately record on media of various sizes other than the standard size, and it is possible to provide an apparatus with a wide range of application.

[Brief explanation of drawings]

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 printing control unit (printer) in the system diagram, and Fig. 3 is the laser scanner unit in Fig. N2. 4 is a schematic diagram showing the paper feeding section in FIG. 2, and FIG. 5 is a schematic diagram showing an example of the paper discharging section shown in FIG. 2. 6 is a plan view showing the operation panel section of the device of the present invention, FIG. 7 is an enlarged plan view of the display section in FIG. 6, and FIG. 8 is a block diagram showing an example of the data control section in FIG. 1. , FIG. 9, 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 area of the recording section in the data control section and paper, and FIG.
Figure 3 is a 10-step diagram of the print control section in Figure 1, and Figure 14.
The figure is a detailed circuit diagram of each detector in Figure 13, Figure 15 is a block diagram showing details of the drive circuit and output element in Figure 13, and Figure 16 is a block diagram of the motor drive circuit and laser scan motor in Figure 13. Circuit diagram showing details, No. 17
The figure is a detailed circuit diagram showing the laser modulation circuit and semiconductor laser in Figure 13, Figures 18 and 19 are characteristic diagrams showing the relationship between the semiconductor laser and the optical output, and Figure 20 is the
(Time chart for explaining the operation of the circuit in Figure 7. Figure 21 is a detailed circuit diagram showing the beam detection circuit and beam detector in Figure 13. Figures 22 and 24 are the operation of the circuit in Figure 21. Waveform diagrams for explanation; FIGS. 23(A) and 23(B) are front and side views showing an example of the structure of the beam detector; FIG. 25 is a detailed diagram of the print data writing control circuit in FIG. 13. 26 is a circuit diagram of the interface circuit in FIG. 13, FIG. 27 is a relationship diagram between command abbreviations and functions used in the device of the present invention, and FIG. 28 is a content of status used in the device of the present invention. FIG. 29 is a diagram showing the relationship between the beam scanning position and data writing position on the recording photoreceptor in FIG. 3, and FIG. 30 is the printing area of the entire surface of the paper including the paper size shown in FIG. 29. Plan view without parts shown, No. 31
Figures 32 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 the circuit in Figure 25. FIG. 37 is a detailed block diagram of the high-voltage power source for charging in FIG. 15, and FIG. Figures 41 to 41 are characteristic diagrams for explaining the operation of the circuit in Figure 37;
2 is a schematic diagram showing the relationship between the laser scanner unit and the recording photoconductor, FIG. 43 is an explanatory diagram showing the relationship between the recording photoconductor and paper, and FIG. 5
Modified examples of the paper output tray shown in the figure, FIGS. 45(A) and 45(B)
) and FIG. 46 are detailed diagrams of data recorded in each recording device in FIG. 13, FIGS. 47 to 54, and FIG. 55.
FIGS. 56 and 60 are flowcharts for explaining the overall operation of the apparatus of the present invention, and FIGS. 57 to 59 are flowcharts for explaining the operation of the apparatus of the present invention. The time charts, FIGS. 61 to 63 are relationship diagrams showing display numbers and their contents in the apparatus of the present invention. 1...External ti position, 107...Storage means, 276...Recording start position clocking means, 277
... Recording end position timing means, 317.321.
. . . Recording medium storage unit, 325 . . . Recording medium manual supply means. Not yet 18 Figure 21 1L Deaf 8- IS (OFF) Yabite Kaimo-L Figure 43 4b3

Claims (1)

[Claims] In an apparatus for recording recording information from an external device onto a recording medium by scanning a beam over the recording medium, a recording start position timing means for measuring the time from a scanning start position to a recording start position in the scanning direction of the beam; Recording end position clocking means for measuring the time from the scanning start position to the recording end position in the scanning direction of the beam; Recording medium manual supply means for manually supplying the recording medium; and the medium manual supply means specified by an external device. 1. A recording device comprising: storage means for storing data regarding a recording area corresponding to a medium size, and wherein each of the time measurement means is set by specified size data from the storage means.