JPS60237464A - Recorder - Google Patents

Abstract

PURPOSE:To enable exact positional correction by data processing without requiring special tools by forming the adjusting data incorporating the mechanical positional deviation of two housing parts for recording media and controlling the position for starting recording by said data. CONSTITUTION:A means 276 for clocking the position for starting copying which clocks from the position for starting beam scanning up to the position for starting recording as well as the 1st and 2nd housing parts for recording media which are installed respectively in different positions and contain plural sheets of recording media are provided. A storage means which records the set data of the position for starting recording corresponding to the sizes of the respective housing parts and a control means which forms the adjusting data based on the mechanical positional deviation of each paper housing part and inputs the adjusting data as set data to the means 276 in the stage of setting the set data to the means 276 and performing recording are provided. The adjustment is made by data processing in the above-mentioned way and therefore the exact positional correction is made possible.

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a recording device that records information on a recording medium by scanning the recording medium with a beam. [Technical background of the invention and its problems] In this type of recording device, a plurality of storage units, for example, first and second cassettes, are provided for storing paper, which is a recording medium, and a plurality of paper sheets of different sizes are set in each. They are installed in the upper and lower tiers of the storage section of the main body of the device. However, when assembling the device, there are many cases where the positions of the storage compartments are misaligned, or the cassettes themselves are mismatched, and if the device is used as is, the position of the image transferred to the paper will be uneven. was occurring. In order to solve this problem, the position must be adjusted using a special tool, which is complicated. [Objective of the Invention 1] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a recording device that can perform recording at appropriate positions even if the upper and lower cassettes are misaligned. This is the purpose. [Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides a mechanism for determining a recording start position in a device that performs recording by beam scanning on a recording medium. Adjustment data that takes into account positional deviation is created, and a recording start position is defined based on the adjustment data. (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 does not show a detailed mechanical diagram of a printer 300 having a video interface, and the printer 300 incorporates the print control section 100 shown in FIG. 1. In FIG. 2, 300 is the printer body, 301 is
A photoreceptor 302, which is a recording medium on which information is recorded by 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. Reference numeral 305 denotes a transfer channel for transferring the toner developed on the photoreceptor 301 onto paper! ? - jar 306 is a peeling jar 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 depth of the developer; 310 is a cleaning blade that removes toner remaining on the photoreceptor 301 after transfer; be. 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 3o1. , 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 mirror 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; 320 is an upper cassette size detection switch (detection means) provided in the upper cassette 317 and configured with 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 3.06 to the fixing device; 331
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 paper ejection roller, and 336 is a paper ejection switch for detecting the paper ejected from the fixing device 331. 337 is a first cooling fan that cools the inside of the printer 300, and 338 is the charger 304 and the 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 a drum temperature sensor to detect the temperature of a drum. FIG. 3 is a perspective view schematically showing a portion for recording information on the photoreceptor 301 using a laser beam. In FIG. 3, a laser beam emitted from a semiconductor laser 344 is corrected into parallel light by a collimator lens 343, and the parallel light is applied to one surface of an octahedron of a polygon mirror 313. Since the polygon mirror 313 is rotated at high speed in the direction of the arrow by the scan motor 312, the laser beam incident on the polygon mirror passes through the f/θ lens 314 and scans the beam scanning range 348 from left to right. scanned. 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 is performed by one surface of the polygon mirror 313, 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. Note that, as shown in FIG. 2, in an actual printer, the laser beam that has passed through the t/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 45 is attached to the bottom of the plate spring 454.
7 is provided so that the angle of the reflecting mirror 345 can be changed. As is clear from FIG. 2, the laser scanner unit shown in FIGS. 3 and 42 is shielded from the outside to prevent the scanning beam from leaking. The results of beam detection by the beam detector 346 are displayed at appropriate positions on the scanning panel shown in FIG. FIG. 4 is an explanatory diagram of the registration roller front pass sensor 394. Manual stop switch 3 in Figure 2
28 only detects manually fed paper, whereas the purpose of the registration roller front path sensor 394 is to detect paper during paper feeding from a cassette. In FIG. 4, the paper fed from the upper cassette 317 and the lower cassette 321 by either the upper paper feed roller 318 or the lower paper feed roller 322 is fed along the paper guide plate to the registration roller 329. be done. At this time, if paper feeding is performed correctly, the light emitted from the light emitting diode 393 is blocked by the paper, and no light enters the registration roller front path sensor 394, so that the fed paper can be confirmed. Furthermore, if the paper is not fed correctly, the paper does not reach the position of the registration roller front path sensor, and the light from the light emitting diode 393 continues to enter the registration roller front path sensor. ,
It can be recognized that paper has not been fed. FIG. 5 shows a reversing tray 381 which is an optional unit.
FIG. Normally, the printer 300 is equipped with a non-reversible tray 397 as shown in FIG. When using such a non-inverted type, the first printing paper is -
Because it is on the hanging side, data must be sent from the last page from the information providing device (host system 1), which has the disadvantage that the information file method on host system 1 becomes complicated. . Therefore, the book reversing tray 381 is indispensable in order to compensate for the above-mentioned drawbacks. In FIG. 5, the paper that has passed through the paper ejection roller 335 of the printer 300 is transported by transport rollers 382 and 383.
The sheet is stored in the tray 384 in an inverted form from when it passes the sheet discharge roller 335. Therefore, since the printing side of the paper is on the bottom side, the first page is on the bottom side, but if you take out the paper from the tray 384 and turn the printing side of the paper on the front side, the first page will be on the top side and the last page will be on the bottom side. The page is on the lower side, and the above-mentioned drawbacks of the non-reversible tray 397 can be solved. In the figure, 385 is a paper stopper that can be slid according to the length of the printing paper in the 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 for receiving light. When the paper 390 is in the tray 384, the tray sensor 392 is not irradiated with light, and when there is no paper 390, the tray sensor 392 is irradiated with light, so that the presence or absence of the paper 390 can be detected. FIG. 44 shows the other systems of the paper presence/absence and paper full detection units. 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 81 is "full of paper", the position a2 is "paper present", and the position a2 is "paper full".
Position 3 is in the "out of paper" state. The separating means 38
9 separates the actuator 388 at least while the paper 390 is being discharged into the paper output tray 384, and activates the solenoid in synchronization with the current state signal when the paper is to be detected, for example, during a printing operation or during a stop. 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 has a structure that can be opened from the top, it cannot be opened unless the front cover 351 is opened in the direction of the arrow, to prevent the operator from operating incorrectly. 353 is a 6-digit mechanical counter, which is incremented by 1 each time a sheet of paper is printed. 354 is a select switch for selecting online/offline, and 355 is a select lamp that corresponds to the select switch 354 and lights up when online. 356 is a 1-digit seven-segment LED that displays the error details when a serviceman is called, the mode number when in maintenance mode, etc., and 357 is the printer 30.
A power lamp that indicates that the power is turned on.
Reference numeral 358 indicates a tray full lamp that indicates that the reversible tray unit 381 is full of printing paper, and reference numeral 359 indicates a color LCD display that displays details of the operating status of the printer. The total counter 353 to LCD display 359 described above are constantly operated or displayed. Next, the maintenance cover 352
This section explains the parts that cannot be operated without opening the . The following parts are to be operated only by service personnel. 403 is a maintenance switch for selecting maintenance mode and replacement mode; 406 is an indicator lamp indicating that the device is in maintenance mode. 407 is an indicator lamp indicating that it is in exchange mode;
404 is a selection switch that selects the operation mode number in each mode; 408 is a selection lamp that indicates that the selection operation by the selection switch 404 is possible; 405 is a test print mode selection and the above-mentioned maintenance, replacement, and test print. 360 is a main exposure adjustment volume which will be described later, and 361 is a shadow exposure adjustment volume. Further, both the volumes 360 and 361 are structured so that they can be turned by inserting an adjustment screwdriver, 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, A6 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 converts the character code information and image information sent from the host system 1 into a dot-compatible page memory 20 that corresponds to the print area on the paper of the printer 300 and then stores the data. Further, the stored data on the page memory 20 is sent to the printer 300 to perform a printing operation. The data control unit 2 is configured to accept two types of information. In other words, one is character code information (JI88
In this case, the character generator 15 generates a character pattern corresponding to the character code, and stores the dot information of the character pattern on the page memory 20. The other is image information, and in this case, it is already input in the form of dot information, so it is stored in the page memory 20 as is. Hereinafter, an overview of the data control section 2 will be explained with reference to FIG. Information from the host system 1 is sent to the interface 50 via the signal line S01, and the information is further stored in the data latch 3. 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 signal line SO3 are the busy signal and status signal line from the data control device. The format of the information sent from the host system 1 is shown in FIGS. 9 and 10. The format example in Figure 9 is for character code information, where a character identification code indicating that it is character code information and a paper size code indicating the size of the paper to be printed are placed at the beginning of one page. There is. Thereafter, character code data is entered in the order of the first line, second line, . . . nth line, and finally an END code indicating the end of data for that page. Further, character code data for one line is made up of a code indicating the character size, a character code, and an LF code indicating the delimitation of one line of data. FIG. 10 shows a format for image information, in which an image identification code indicating image information and a paper size identification code indicating the size of paper to be printed are entered at the beginning of one page of data. After that, 1 line. 2 lines... Image data is contained in the order of m lines. Furthermore, since the data for one line is specified by the paper size identification data, it is automatically determined by counting the specified data on the data control unit 2 side. There is. The input information from the distributor 4 is processed as follows. The information that has entered the distributor 4 is always input from the distributor 4 to the decoder 5 via the output line S04. First, regarding the case of character code information, when the character identification code shown in FIG. The main control unit 6 determines that the input information is character code information, and instructs the distributor 4 to input the next paper size data to the page code buffer 7 control circuit 7 via the signal line SO6. . Therefore, the paper size data is input from the distributor 4 to the page code buffer 7 control circuit via the data line SO7. Next 1st line, 2nd line...0
The data up to the row is input from the distributor 4 to the page code buffer via the data line SO8. At this time, the character code data is stored in the memory area on the page code buffer 9 designated by the address counter 8. When the input of character code information for one page into the page code buffer is completed and the END code shown in FIG. 9 is detected by the decoder 5, the main control unit 6. EN to each page code buffer 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 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) means that both the vertical address (ADRV) and the horizontal address (ADRH>) are O'. 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 G in FIG. 11). 43 is the last horizontal address of A3 size paper (A3HE
), 44 is the horizontal address of A4 size paper (A4HE)
, 45 is the horizontal address (A58E) 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 (
Δ5VE). 33 is A3 size vertical address ADRV = O, horizontal address △DR) (=A3HE point ADR (0, A38E), 34 is AD in the same way
R(0, A4HE) and 35 indicate ADR(0, A5HE), respectively. 36 is A3 size vertical address A
DRV-(A3VE), point ADR (A3VE. 0) with horizontal address ADRH=0, 37 is ADR (A4VE, O) in the same way. 38 indicates ADR (A5VE, O), respectively. 39 is the A3 size vertical address ADRV=A3VE,
Horizontal address ADRH=A3HE point ADR(A
3VE, A3) (E), similarly Nishite 40, ADR<A
4VE, A41-IE), 41 is ADR (A5VE,
A38E) are shown respectively. Storing a character pattern as a dot image in the page memory 20 having the above-mentioned memory space is performed as follows. The character size data of the first line is read from the page code buffer 9 to the page code buffer control circuit 7 via the signal line S10. The character size types in this embodiment are basically two types of fonts: 40x40°32x32 dots, and the page code buffer control circuit 7 determines the character size based on the read character size code, and sends the determination signal as a signal. It is sent to the page memory control circuit 17 via line S11 and to the character generator 15 via signal line 813, respectively. Page memory control circuit 17
Then, the line feed pitch and character pitch are controlled by the character generator 1 based on the character size determination signal.
In step 5, character size areas are switched. The character code after the character size data is stored in the line address counter 1 in the line buffer '10, which has the memory capacity for one line.
Transferred to the area specified in 1. 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 line in the vertical direction of the character flute (line 57 in FIG. 11) is written into the page memory 20. Here, the line/scan counter 13 has an initial value (0,
O), and the write address counter 18
The value of is ADR(0,0). row buffer 10
The character code data is sequentially read out 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 top six pits are counters that count scanning lines, that is, vertical counters for character patterns.
In the case of a 4° x 40 dot character, count 0 to 39 plus 2 minutes of line feed pitch control lines 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 O to 4 plus the character pitch control and returns to 101 (the output of the character generator 15 is an 8-bit parallel counter). (for this reason). Below, the font size is 40X40. The operation in the case where the horizontal distance between characters is 8 bits and the vertical distance between one character is 8 bits will be described. As mentioned above, the first character code (“
When T') is set in the output latch 12, the character code and the output of the line/scan counter 13 are combined in the synthesis circuit 14 and input to the character generator 15 as a 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 (8 bits) of the character pattern at line 0' in the vertical direction and line O' in the horizontal direction. ) is output.The output data of the character generator 15 is output to the output latch 16 in order to synchronize writing to the page memory 20.
-H latched in the page memory 2 specified by the write address counter 18 by the page memory control circuit 17.
Written to address above 0. In this case, since the value of the write address counter 18 is ADR (0, 0),
It is written to vertical address '0' and horizontal address '0'. Then, when writing of the 1-byte character pattern is completed, the value of the line/scan counter becomes (0, 1>
The value of the address counter 18 for m-input also changes to AD.
Changes to R(0,1). Therefore, the character generator 15 outputs the data of the "O'-th line in the vertical direction and the data of the "1"-th line in the horizontal direction of the character pattern, which is latched by the output latch 16 in the same manner as described above, and is then latched by the ADR ( 0, 1> address. In this way, 1
The end of the vertical “O’ line (゛4) of the two character patterns
When the writing of the data ('4' data) is completed, the value of the line/scan counter becomes (0, 5) and the value of the write address counter 18 becomes ADR (0, 5). Since the horizontal spacing between characters is 8 dots (1 byte), all outputs of the character generator 15 are forced to "O'" by a command from the page code buffer control circuit 7.
Then, 0' is written to the ADR (0, 5) address of the page memory 20, and after the write operation is completed, the row address counter is incremented by "1" and the next character code is output from the row buffer 10 to the latch 12. Also, the line/scan counter is set to (0, 0>, write address counter 1
8 becomes ADR (0, 6). Therefore, next, the data of the "0" line row 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 ADR (0, 6>, (0, 7), (0,
8), (0°9), and (0, A), and write the character pattern data of O to the address specified by the writing address counter 18, respectively. Then, the value of the write address counter 18 is (0°B),
When the value of the line/scan counter 13 reaches (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 1O. Also, the line/scan counter 13 is set to (0°0), and the write address counter 18 is set to ADR(0°C)L. In this way, the character pattern data of the 0th line in the vertical direction is sequentially written into the page memory 20, and when the ``LF'' code is output to the output of the line buffer 10, the ``LF'' code is output. 'The code detection 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, the writing address counter 18 is sequentially incremented by 1'. 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, AD
When the value of R (0, A3HE) reaches the 33rd point in FIG. 11, after the forced "O' write operation, the write address counter 18 becomes ADR (1, 0) and the row address counter 11.18 (0). , the line/scan counter 13 is (
1, ○) respectively. Then, 'T', which is the first character code from the line buffer 1o, is set in the output latch 12 again. Then, the character pattern data of the vertical direction "1" line of the character pattern is written into the page memory 2o. Similarly, the character pattern data of the vertical direction "2" of the character pattern is written into the page memory 2o. 3'... When the write operation up to the 39th line is completed, the write address counter 18 is set to ADR (28, O).
, Row 7 Dress Cow > Ri 11 Lt (0). The line/scan counters 13 are each set to (28, O). This completes the writing operation of character pattern data for one line, but next, since the line feed pitch is every 48 lines, “O” is forcibly written to the page memory 2o for the remaining 8 lines. When the writing of line O' is completed, the address value of the writing address counter 18 is changed to the point 61 in FIG.
(30, 0>, the line address counter 11 is (0). The line/scan counters are each set to the initial value (0, O). All write operations including the line feed pitch for one line are now completed. The next second line of character code data is transferred from the page code buffer 9 to the line buffer 10. When the transfer of character code data is completed, the line address counter 11 returns to the initial address (0). After that , the character pattern data on the second line is written in the same way as the character pattern data on the first line is written.Therefore, when the writing operation of the character pattern data on the second line is completed, the address of the write address counter is The value is ADR (60, O), and the row address counter 11 is (O
), 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 an ``END'' code indicating the last line is detected from the line buffer, the data writing operation of the character pattern is stopped. Then, the page code buffer 7 control circuit 7 forcibly sets the output of the character generator 15 to 101 via the signal line S13, and notifies the page memory control circuit 17 that writing of character pattern data has ended. After receiving the write end signal, the page memory control circuit 17 selects the final memory address (39 point ADR (A3VE) in FIG. , A3
Forcibly write 0' to HE)). And Figure 11 3
0' is written to the 9th point, and the entire operation of writing character pattern data for one page of the specified paper size to the page memory 2o is completed. And write address counter 1
8 is ADR (0, O), row address counter 11 is (
0), the line/scan counters 13 are all initialized to (0, O). Next, a case where the data sent from the host system 1 is image information will be described. When the image identification code shown in FIG. 10 is input to the decoder 5, the output of the decoder 5 is input to the main control section 6 via the signal line SO5. Main control section 6
Then, it is determined that the input information is image information, and a command is given to the distributor 4 to input the next paper size data to the page memory control circuit 17 via the signal line SO6. Therefore, the paper size data is sent from the distributor 4 to the data line 307.
The data is input to the page memory control circuit 17 via the page memory control circuit 17. Next image data 1, 2. ...The image data up to m is sent from the distributor 4 to the page memory 20 via the data line 815.
is input. The method of inputting image data to the page memory 20 is performed as follows. When the page memory control circuit receives the paper size identification code, it stores the next image data at 32 points (address ADR (0, O)) in FIG.
The write address counter 18 is set to ADR (
0, O). Then, the data length for one line in the horizontal direction is determined from the paper size identification code by referring to a table in the page memory control circuit 17. Therefore, if the paper size of the image information to be input into the page memory 20 is A4, the data length of one line is a value up to 44 points (△4HE) in FIG. 11, that is, A41-I E'. Become. Host side system 1
Naturally, the length of the image information per line sent from ``A 4 HE'' is ``A 4 HE''. ...The data length of both image data m is A4VE', and the number m of image data is the value of 47 points in FIG. 11, that is, A4VE'. Therefore, image data 1 in FIG. 10 is stored in the page memory 20.
is Fig. 11, 32-point ADR (0,0) to 34-point ADR (0°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 40-point ADR (A4VE, △4
HE). Image information is written into the page memory 20 while controlling the write address counter 18 in this manner. The character pattern data 13 written in the page memory 20 in this manner is sequentially output to the latch 21 . Gate circuit 23. Data to be printed is sent to the print control section through the interface 22 and the interface bus S17. 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 S20 are strobe signal lines when sending command data and print data,
S21 is a busy signal line from the print control unit, S22 is
826 is a horizontal synchronization signal line from the print control section, S23 is a page end signal line that also indicates the end of print data, S24 is a ready signal line of the print control section, S25 is a print request signal line that indicates a printable state. A select signal line (2 lines) that specifies the data content of the data line in the interface bus 817. 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 response, the print control section sends a horizontal synchronization signal S22. This horizontal synchronizing signal 822 first sequentially sends out each data of the 32-point line in FIG. S2
2, the address is sequentially changed line by line according to S23, and the page end signal S23 is sent from the print control section.
This operation is repeated until the page end signal S23 is received, and the data in the designated area of the page memory 20 is sent to the print control unit.When the page end signal S23 is received, the data sending is forcibly stopped. The print control unit outputs the page end signal 823 at the same timing as the horizontal synchronization signal S22. Also, in correspondence with the memory addresses in Figure 11, the last line A3 of the memory area of the paper size has 46 points, and A4 has 47 points.
It is output from the print control unit at the same timing as the point or before it. Further, in the page memory control circuit 17, the page memory 20
When 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 1102 for controlling each unit in the microprocessor 1102 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 each of the timeout signal lines 828 from the general-purpose timer 103 are sent to the microprocessor 10.
Tell 1. A general-purpose timer 103 generates basic timing signals for controlling paper conveyance, drum rotation processes, and the like. This general-purpose timer 103 is 5m in this embodiment.
It is set to 5eC. A ROM (read only memory) 104 contains all control programs for operating the print control section 100. 105 is the same ROM and contains a data table different from that of the ROM 104. The contents of the data table are shown in Figure 45 (A). In Figure 45 (A), the address (40
00,4,001>, data for top margin control in case of paper size A3, 11~res(4002,4,00
3) contains bottom margin control data and address (40
04, 4005) contains left margin control data, and addresses (4006, 4007>) contain right margin control data.Similarly, address (4006, 4007>) contains data for right margin control.
4008 to 400F) contain data for controlling the top, bottom, left, and right margins for paper size B4. Margin control data corresponding to various paper sizes is contained up to address (4087). These margin control data are used as set data for a margin control counter in a print data write control circuit 119, which will be described later. Here, the top margin refers to the 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 contents of the command are 1 heb/bottom margin change table. These include a top margin adjustment table, a cassette upper/lower adjustment table, a cassette/manual feed adjustment table, etc. Addresses (4200 to 42FF) contain data on the charging characteristics of the photosensitive drum 301, including five types of data A-'-F. This data is then used for temperature correction control of the charging charger 304, which will be described later. Addresses (4300 to 43FF) are an exchange data table, and photosensitive drum 301. It contains replacement cycle data for the developer in the developing device 307 and the fixing roller 332. The addresses (4400 to 47FF>) are a control timer table and contain various timer values for printing operations such as each process timing and paper feed timing. 106 is a RAM (random access memory); This is a working memory, and as shown in FIG. 46, it includes timers (TIM) A, B, . (memorizes data), status list 6, and other contents.The microprocessor
101 compares the cassette 4 noise stored in the paper size register with the size of recorded information (image data, etc.) from an external device sent from the data control unit 2, and determines whether the cassette size is larger. If it is larger, the printing control section 1 in the subsequent 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 operation section that the drum should be replaced. 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 Figure 45 (A>). The address (6500) is the fixing roller replacement counter, which is counted up by 1 for each print as in the case of drum replacement, and the value in the replacement table (fixing roller) in Fig. 45 (A>) is displayed. 108 is a power supply sequence circuit, and the non-volatile generation RA
It has the function of preventing erroneous operation when turning on or turning off the power of M107. 3 and 9 are power supply devices that supply 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. 116 is a motor, high voltage power lamp, solenoid,
Drive elements such as fans and heaters are shown. 115 is a drive circuit for the drive element 116; 114 is a drive circuit for the drive circuit 1;
is an output port that provides an output signal to 15. 312 is a laser scan motor for operating the laser beam, 118 is a drive circuit thereof, and 117 is an input/output port that provides a drive control signal to the drive circuit. 344 is a semiconductor laser, 120 is a laser modulation circuit that performs optical modulation of the semiconductor laser, and 346 is a beam detector that detects the light beam operated by the laser scan motor, and a PIN diode that responds at high speed is used. There is. 121 is a high-speed comparator for digitizing the analog signal from the beam detector and creating a horizontal synchronization pulse; 119 is a high-speed comparator for digitizing the analog signal from the beam detector; This is a print data write control circuit that controls writing to the test pattern and generates test pattern print data. 122 is an interface circuit that controls output of status data to the data control section 2, reception of command data and print data from the data control section 2, and the like. The details of the main blocks in FIG. 13 will be explained below. Figure 14 shows various detectors 11 in Figure 13.
FIG. 3 is a detailed circuit diagram of No. 3. In FIG. 14, signals from various detectors are input to a multiplexer 139. In the multiplexer, an 8-bit signal S32 is inputted to the input port 112 in FIG. 13 by a select signal S31. Reference numeral 320 denotes an upper cassette size detection switch, which is composed of four switches, and the combination of these switches indicates the paper size. Reference numeral 324 denotes a lower cassette size detection switch, which has the same configuration as the upper cassette size detection switch. Reference numeral 319 is a cassette upper paper out switch, which is turned on when the cassette runs out of paper. 323 is a lower paperless switch. 123 is a pass sensor in front of the registration roller, and a CDS light receiving element is used. In this sensor, a bias voltage is applied through a resistor (not shown), and the output voltage changes depending on the presence or absence of paper. Therefore, by inputting the output to the comparator 124 to which the reference voltage ref1 is applied, a signal for determining the presence or absence of paper can be obtained. Reference numeral 326 indicates a manual feed switch for detecting paper from the manual feed guide 325, 336 indicates a paper ejection switch located on the fixing roller section, and 395 indicates a paper ejection switch located on the paper ejection tray section. Reference numeral 125 indicates a toner out detection switch for detecting the absence of toner in the toner box, and 126 indicates a toner full detection switch which operates when the toner bag is full of toner. Reference numeral 127 is a sensor for detecting the specific toner density of the carrier (probe density 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 a temperature fuse provided in the fixing device, 131 is a door switch that turns the drive power (+24VB) to 0.
This is an MC relay that turns N10FF. Since one of the temperature fuses 130 is connected to the power supply +24VA,
When the temperature fuse 130 is blown due to an abnormality in the fixing device, the MC relay 131 is turned off and the driving power is turned off.
F is given. Further, the temperature fuse 130 is connected to a resistor RO1, and one end of the resistor RO1 is connected to the resistor R○2 and the input of the comparator 132. Further, a reference voltage Vref3 is applied to the other input of the comparator 132. Therefore, when temperature fuse 130 blows, the input of comparator 132 becomes OV. Therefore, the comparator 132 outputs a temperature fuse blowout detection signal. 133 is a destination selection switch, and specifically, the ON state is for domestic destinations (A and B size>), and the OFF state is for U.S. destinations (Lecal, Letter size) due to the 0N10FF of this switch.Therefore, for example, the above-mentioned upper stage Or, even if the code combinations are the same using the lower cassette size switch (4 pieces), depending on the state of this switch, the
Select one of the paper sizes for the US. 134 is a jam reset switch, which is installed inside the front cover. This switch is a switch that is turned ON for confirmation after the operator calls for a paper jam or full toner, after the operator clears the jam or replaces the toner bag. Therefore, turn this switch ON after the above processing. Otherwise, the jam or full toner display on the operation panel will not be cleared. Reference numeral 392 is a paper discharge tray sensor for detecting paper in the tray shown in FIG. A thermistor 334 detects the temperature of the fixing device, and is controlled so that the temperature detected by this thermistor is constant. The output of the thermistor 334 is connected to the resistor RO3 and the input side of the comparators 136 and 137. Therefore, the input voltage of the comparator changes by C 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 R8 is connected to the connection point of O7, one of which is connected to the collector of the transistor 138. Therefore, when this transistor 138 is turned on by the input signal (power save signal) 33, the comparator 136
The reference voltage is lowered by the resistor RO8, and the temperature control of the fuser is lower than when the transistor 138 is turned off. Therefore, the power consumption of the fixing device becomes low and the fixing device enters a power save state. Further, the reference voltage of the comparator 137 is given by the voltage division of the 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 failure of the heater drive circuit during printer operation. . and the output 83 of comparator 136
3, one side is input to the multiplexer 139,
Read by microprocessor-101. Note that this input signal is used to detect the ready state of the fixing device. The other signal is used as a drive signal for the fixing device heater lamp 333 in FIG. 342 is a drum temperature sensor that detects the temperature near the photoreceptor 301. The output side of thermistor 342 is connected to resistor R58 and the input of operational amplifier 270. Therefore, the resistance value of the thermistor 342 also changes depending on the temperature change near the photoreceptor 301. Therefore, operational amplifier 2
The input voltage of 70 also changes. The operational amplifier 270 outputs a low voltage when the temperature of the photoreceptor 301 is low, and a high voltage when the temperature is high. operational amplifier 2
70 is a voltage follower, and its output is
It is connected to the input of the A/D converter 271. Then, the output voltage of the operational amplifier 270 is converted into a digital value by the A/D converter 271 and read by the microprocessor 101 through the multiplexer 139. This A/D converted temperature data of the photoreceptor 301 is used for charge correction of the photoreceptor 301, which will be described later. 440
441 is a cassette/manual feeding adjustment switch, and 442 is a top margin adjustment switch. These various adjustment switches are installed inside the device, and service personnel must open the aircraft to operate them. Each of these switches has a plurality of setting sections. That is, the cassette upper/lower adjustment switch 440 has a plurality of setting sections corresponding to the positional deviation of the lower force hit with respect to the center position of the upper cassette as a reference, and the cassette/manual feed adjustment switch 441 similarly has a center position of the upper cassette. The top margin adjustment switch 442 has a plurality of setting sections for adjusting the positional deviation of the manual feed guide based on the position, and 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 (one hit) 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 developer motor, which performs PLL control. 143 is a fixing device motor, and a DC-driven Hall motor is used. 142 is a driver for the fuser motor 143;
Performs PLL control. 145 is a fan motor for cooling the inside of the machine, and a DC-driven Hall motor is used. 144 is a driver for the cooling fan motor, which is a PLL like the developer and fuser driver described above.
No speed control is performed. 147 is the photosensitive drum 30
1 drive motor, and uses a 4-phase pulse motor. 146 is a driver for the drum motor 147, which employs a constant current 1-2 phase excitation force type. The speed is approximately 1200 PPS, which is the speed at which vibrations are less likely to occur. Reference numeral 149 is a registration motor that drives the registration 1 roller 329 and the 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, forward and reverse rotations are transmitted via a one-way clutch. Reference numeral 150 denotes a driver for the paper feed motor 151, which uses constant voltage two-phase excitation similarly to the registration motor driver 148. The speed is about 400PPS. Reference numeral 302 denotes a static elimination lamp that removes residual charges on the photoreceptor 301 before charging, and is composed of a plurality of red LEDs. R10 is a current control resistor for the static elimination lamp 302, and 152 is a driver for the static elimination lamp 302. 303 is a pre-transfer static elimination lamp placed in front of the transfer charger to increase transfer efficiency, and includes a plurality of red LE[)
It consists of R11 is a current control resistor for the pre-transfer static elimination lamp, and 153 is a driver for the pre-transfer static elimination lamp. 158 is a solenoid for the toner collection blade, and when this solenoid is turned on, the photoconductor 301
The blade 310 is pressed against. 154 is a driver for the blade solenoid 158. 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 to the developing device 307 from the toner small collar. 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 the toner supply motor 159
is a driver. 131 is an MC relay which 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, the power supply side common of the motor, lamp, etc., omitting the MC relay 131, is connected to the contact 163 of the MC relay 131,
The other contact is connected to the +24VB power supply, so that the motor and lamp can be operated when the MC relay 131 is turned on. 304 is a charger for charging, and the case of the charger is connected to the ground of the aircraft body. The corona discharge wire of the charger is connected to the high voltage power supply 338.
is connected to the output terminal of the charging high voltage power supply 160,
The high voltage power source for charging has a high voltage output of 0N10FF.
The signal line S35 is connected to an analog control signal line S36 that changes the high voltage output current. Further, the analog control signal line 836 is connected to the D/A converter 165, and is connected to the charging voltage control I from the microprocessor 101.
The D/A converter 1 is
A306, which is converted into an analog voltage at 65 and controls the output current of the high voltage power source for charging, is a peeling charger, and a stripping charger 306 is connected to the output of the high voltage power source 161 for peeling. The high-voltage power source for peeling has an AC output. Reference numeral 305 is a transfer charger for transferring the developed t=i-ner on the photoreceptor 301 onto a sheet of paper, and the transfer charger is connected to the output of the high-voltage power source 62 for transfer. In addition to the transfer charger output, the transfer high-voltage power supply also incorporates a developer bias power supply, and its output line S3
8 is connected to a developer magnet roller 308. This voltage applies a bias voltage to the magnet roller 308 to provide a developing bias. 33 is a heater lamp of the fixing device, one side of which is connected to one of the power sources of the ACI OOV. 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 C heater lamp 333 is connected to the MC relay 1.
It operates only when 31 is ON. Also, heater drive circuit 1
Two input signals 833 and 839 are input to 66, and S33 is the thermistor 33 in the fixing device shown in FIG.
4, which 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. LO2, 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, and its output is connected to the base of the power transistor 171, 172, 173 which drives the motor tiles LO2, 103, LO4 in the drive circuit 118, and resistors R26, R27. , R28. Furthermore, base resistors R23, 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 the 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 the LOW level, the switching gate 176 is enabled. The frequency division counter 175Q2 output is inputted to the FG large input of the PLL control IC 167. Here, to briefly explain the input/output signals of the PLL control IC 167, the 878Ml child (PI-AY/5TOP> is H
It stops at IGH level and starts at LOW level. In the case of HIGH level, the outputs of both terminals of AGC and APC become HIG+- level. FGIN is the rotation motor pulse signal input from the motor to be controlled. N1. N2 is the signal to switch the frequency division number of the reference frequency divider inside this IC, 33/45 is the motor rotation speed switching signal, CPO
UT is the crystal reference frequency division output signal, CPIN is the reference frequency input, LD is the lock detection signal, which is HIG when the motor rotation speed is within the lock range) - level, otherwise LO
W level is output. AFC is the output of the motor speed control system and the output of the 8-bit D/A converter inside the PLLIC.
APC is the output of the motor phase control system and is the 8 in the PLLIC.
This is the Pitt D/A converter output. Also, PLL [C1
XOl connected to 67 is a crystal oscillator for generating a reference frequency, and COl and CO2 are oscillation capacitors. The output terminals of AFC and APC of the PLL control IC 167 constitute an adder circuit with resistors R12 and R13, and are connected to one side input terminal of an operational amplifier 168. operational amplifier 1
Connect +12■ to the + side input terminal of 68 with resistors R14 and R1.
A voltage divided by 5 is applied. Further, a negative feedback circuit is formed by the resistor R16 and the capacitor CO3, and the capacitor CO3 in particular functions as a bypass filter. Therefore, the amplification degree of the operational amplifier 168 is higher than a certain frequency)
) has a characteristic of attenuation. The output of the operational amplifier 168 is connected to an input terminal of a pulse width modulation switching regulator IC 169. 16 is a commercially available pulse width modulation switching regulator IC. This IC169 and power transistor 17
0. Diode 001, coil LO1, capacitor CO
5 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 VR inside IC169.
A reference voltage obtained by dividing the voltage of EF by resistors R17 and R18 is applied. DEADT 1ME@ is to regulate the maximum pulse width of the output, and the VREF is connected to the resistor R1.
A voltage divided by 9 and R20 is applied. C
I and C2 are output terminals, and the pulse width changes depending on the voltage value of the input terminal. In other words, when the + side input terminal voltage is lower than the one side input terminal voltage, the path width on the LOW level side of C1 and C2 becomes small, and the power transistor 17
The width at which 0 turns ON also becomes smaller. Therefore, the voltage across the capacitor CO5 also becomes smaller. Moreover, when the + side input terminal voltage is higher than the one side input terminal voltage, contrary to the above, the pulse width of C1 and C2 becomes large, and the voltage across the capacitor CO5 also becomes large. The rotation speed control of the scan motor 312 will be explained below. When the rotation start signal S42 of the scan motor 312 becomes LOW level, the AF of the PLLIIIIII IC 167
Since the voltages of both C and APC are at the LOW level until the aforementioned lock signal S41 is output, the operational amplifier 168 outputs a voltage at the G11GH level. Therefore, the output pulse width of the regulator IC169 becomes large, and the voltage across the capacitor CO5 becomes about +16V. Then, at a position where the rotor of the motor is stopped, one of the Hall elements 180, 181, and 182 is turned off.
Since it is set to N, motor coils LO2, L03, and L
Of O4, the coils corresponding to the Hall elements 180, 181, and 182 are 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 P
It is applied to the FG input terminal of the LL control IC 167. Therefore, the frequency division counter 175 functions as an 8 frequency division circuit. The frequency of the signal applied to FGIN is PLl 1C16
When reaching approximately 96% of the reference frequency inside 9, the lock signal L is activated.
D 841 becomes HIGH, and the AFC and APC output levels are not fixed to LOW level (OV), but are set to PLLIG internal D.
/A voltage is switched to the output voltage of the inverter. 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 S40 is L.
Become OW level. Therefore, the frequency divider 175 divides the frequency from the previous frequency by 8 to 4, so the scan motor has a rotation speed of 4/8, that is, 1/2. This is to perform half-speed control as described above in order to prevent problems with reliability of the motor's bearings, etc., from occurring if the motor rotates at high speed for a long period of time. In this embodiment, during printing operation, that is, during high-speed rotation, approximately 12. OOOrpm, about 600O during standby
rpm. FIG. 17 is a detailed circuit diagram of the laser modulation circuit 120 and semiconductor laser 344 in FIG. 13. In FIG. 17, 344 is a semiconductor laser diode, which is composed of a laser diode main body 259 that emits light, and a monitoring photodiode 260 that is a light detection means that monitors the intensity of the output beam from the laser diode 259. Reference numeral 257 is a high frequency transistor which is voltage-current converting means (or first current driving means) and performs optical modulation of the laser diode 259. Resistance R
50 is a current detection resistor, 258 is a laser diode 2
59 is a transistor which is a second current driving means for flowing a bias current, R51 is its current limiting resistor, R5
2 is a base current limiting resistor of the transistor 258. Reference numerals 254, 255, and 256 are high-speed analog switches for modulating the laser diode 259, and when a voltage of GH level is applied to the gate (G) of each analog switch, the drain (D) and source (S)
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 from the laser 259 has three levels in this laser printer. First, the laser diode 259 is turned on by turning on the analog switch 254 with the output P (ON) to almost completely remove the electrical charges on the photoreceptor 301 in a portion corresponding to the white background on the paper. IP (ON). The second part corresponds to the black background on the paper, and is located on the photoreceptor 301.
In order to leave the charged charges on the top as they are, the analog switch 25 is
By turning on the laser diode 259, the output of the laser diode 259 is turned off, that is, the output becomes P (OFF). The third one is for increasing the print density of one dot line with the output P (SH) between the first output P (ON) and the second output P (OFF), and by turning on the analog switch 255. The laser diode 259 outputs the output P(SH
) (Details of P (SH) will be described later). Resistors R42 and R43 are analog switches 254°25
5. Short circuit protection resistance when changing 0N10FF of 256, 24
9,250.251 is the analog switch 254,2
55.256 gate driver. CO9, C1
0, C1'l is a speed-up capacitor, R4
7, R48, R49 are the gate drivers 249, 2
The input resistance is 50,251. 246 is a 3NAND gate, and when all three gate inputs become HIGH level, the output becomes LOW level, turning on the analog switch 254, and the laser diode 259 becomes in the output P (ON) state. 3
The first of the two input gates is connected to the output of the inverter 253, and the input of the inverter 253 is connected to the print data signal 547 (prints at HIGH level and does not print at OW level). The second is inverter 2
The input of the inverter 252 is connected to the shadow signal 348 (shadow on at HIGH level, off at LOW level). The third is connected to a laser enable signal 849 (laser enable at HIGH level, laser forced OFF at LOW level). Therefore, the condition for the output of the NAND gate 246 to be LOW level is the laser enable signal S49)
"1G H, when the shadow on S48 is LOW and the print data signal 8S47 is LOW. Next, 247 is 3NA
ND gate with all three gate inputs) -11G
When the output becomes H level, the output becomes LOW level, turning on the analog switch 255, and the laser diode 259 enters the output P(81-1) state. The first of the three input gates is connected to the shadow signal S48, and the second
is connected to the output of the inverter 253, which is an inverted signal of the print data signal S47, and the third signal is connected to the laser enable signal 349. Therefore, the NAND
The conditions for the output of the gate 247 to be LOW level are that the laser enable signal 849 is HIGH and the shadow signal S
48 is 1-11GI-1, print data signal S47 is LO
It is the end of W. 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 turns on the laser diode 25.
9 becomes the 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 (Sl
() is used to control. ANALOG-INPUT is an analog voltage input to be sampled, SAMPLEC is a connection terminal for a hold capacitor CO8, and 5TROBE is a sampling strobe signal terminal, which is connected to a sample strobe signal S46. 237 is an operational amplifier with FET input, which constitutes a Porchi 97407 circuit. DO3 is a Zener diode that regulates the output of laser diode 259 to be within the great person 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 C7 at a constant rate. 236 is an analog switch whose gate (G) is connected to a buffer 244, and the sample signal S45 is input to the input of the buffer 244. 253 is a transistor for level conversion, and R39 acts as a current limiting resistor when charging the capacitor CO7. R38 is 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 R35. The output voltage of the laser monitor amplifier 232 is applied to the input side of the comparator 234 through the resistor R34. 232 is an amplifier for the output of the photodiode 260 that detects the optical output from the laser diode 259, and serves as current-voltage conversion means. Resistor R32°R33, VR○1 is the operational amplifier 23
This is a resistor that regulates the degree of amplification. Therefore, the volume V
By changing RO1, the amplification degree of the operational amplifier 232 can be changed. R31 is an output load resistance of the photodiode 260 in the semiconductor laser 344, and a voltage proportional to the output current of the photodiode 260 is obtained. Optical output P of photodiode 260
The relationship between the short circuit current (S) and O is shown in Figure 19. In Figure 19, ■S is the monitor current, and PO is the optical output of the laser diode 259. The output of P (ON) is approximately 6 mW. , P(SH) output is approximately 4mw, P(OF
F) is O. Further, LA-A and LA-B represent two types of laser diode monitor characteristics. Normally, the volume VRO1 is such that when the laser diode optical output is 6 mW, the output voltage of the operational amplifier 232 is 3 mW.
It is adjusted to about V. Therefore, the characteristics of both graphs LA-A and LA-8 in FIG. 19 can be adjusted by the polygon VRO1. 238 is a comparator for checking whether the laser diode 259 is emitting light, and is on the + side. The output voltage of the operational amplifier 232 is applied to the input. Further, a voltage divided by resistors R36 and R37 (in this case, set to 2.OV) is applied to the negative side. Therefore, the laser diode 259 emits light and its output is about 2mW, which changes from LOW level to H level.
The level changes to IGH and a laser ready signal 84.3 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. In other words, 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. Voltage follower 2
A voltage divided by a main exposure adjustment polycomb 360, which is a first voltage variable means, and resistors R4 and R5 is input to the input terminal 39. By varying the main exposure adjustment volume 360, a voltage is input to the input terminal of the comparator 234.
The voltage at one side of the terminal also changes. Also analog switch 2
41 is ON when setting the laser output P (St-1>)
A voltage obtained by dividing the output voltage of the port shifter lower 239 by the resistor R46 and the shadow exposure adjustment volume 361 which is the second voltage variable means is applied to one input terminal of the comparator 234. The above voltage follower 239, analog switches 240, 24
1. Main exposure adjustment polygon: L-me 360. Resistor R45,
Shadow exposure adjustment volume 361. The resistor R46 constitutes a light output setting means. Further, a circuit that compares the voltage detected by the monitor diode 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 27IO and 241 are switched by the main exposure setting signal 3411. That is, when the main exposure setting signal $44 is at a LOW level, the output level of the inverter 242 becomes a HIGH level, and the analog switch 241 is turned on. Also,
When the main exposure setting signal S44 is at HIGH level, the output of the buffer 243 becomes H, IGH level, and the analog switch 240 is turned on. The outputs (S side) of the analog switches 240 and 241 are also input to the voltage follower 261, and the output 850 of the port shifter 261 is used to correct the threshold level of the horizontal synchronous pulse detection comparator of the beam detection circuit, which will be described later. 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. TO-0℃ is the IF-PO characteristic when the case temperature of laser diode 344 is 0℃,
Same < TC=25℃, when case temperature is 25℃, TC=50
°C is the IF-Po characteristic when the case temperature is 50 °C. Taking the case temperature TC = 25°C as an example, the current flowing through the laser diode 259 is

[When F is increased sequentially from O, 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 6 mw. Therefore, even in the case of TO=O°C, the optical output PO starts to be output at about 40 mA, so by turning on the transistor 258, the laser enable When the signal 849 is at the HIGH level, a bias current IFB is always passed to reduce the power loss of the laser modulation transistor 257. Therefore, the laser modulation transistor 257 is extremely stable even at high temperatures due to the action of the bias current IFB. Stable operation is guaranteed.Also, if the amount of change in current required to modulate the laser is, for example, TC = 25°C,
Compared to directly driving a current of <lF25 with the value of lF25-IFB by the transistor 257, the accuracy of the light amount stabilization operation described later can be considerably improved. Furthermore, as is clear from the graph, the output of the laser diode itself varies considerably depending on the temperature, so the light amount stabilizing circuit is required. In this laser light amount stabilizing circuit, the amount of light from the laser diode 259 is detected by a monitor photodiode 260, and the short circuit current is 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 Is and the optical output po of the laser diode 259 are in a perfect proportional relationship.
If is kept constant, the optical output po is always kept constant. Further, since the drift 1~ due to the temperature of the photodiode 260 is very small, even if the temperature changes, the change in the previous 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. 20, 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 a bias current (approximately 3
0mA) flows. Also, at this time, the print data signal S47 and the shadow signal 84.8 are both at LOW level, so the goo 1
~246, 24.7, 248, only gate 246 input is HI G 1 level, so output is LOW
Analog switch becomes level 254, 255, 256
Of these, the analog switch 254 is turned on. Furthermore, the analog switch 236 is turned on when the sample signal S45 becomes 11 G +1. At this time, since the capacitor CO7 is not yet charged, the output of the operational amplifier 237 is at OV, and the base of the laser modulation transistor 257 is also at OV. Therefore, at this point, only the bias current flows through the laser diode 249, and the laser diode does not emit light, as can be seen from the characteristics shown in FIG. Since no laser is emitted from the monitoring photodiode 260 of the laser diode, the monitor current IS is O, and the output of the operational amplifier 232 is OV, so the output j of the comparator 234 is at a LOW level. Transistor 235 is turned off. Since the transistor 235 is OFF, the capacitor CO
7 is charged through resistors R39 and R40. The time constants of the resistors R39 and R40 and the capacitor CO7 during charging are selected to be about 20 to 50 msec. If this value is very small, the response of the stabilizing circuit will be too fast, and the fluctuations in the optical output level of the laser will become large. Moreover, if it is too large, the responsiveness will deteriorate and it will take time for the optical output to stabilize. As the capacitor CO7 is charged, the output voltage of the voltage follower 237 also gradually increases. Therefore, as the base voltage of the laser modulation 1-transistor 257 increases, a current flows to the collector. The collector current rc of the transistor 257 at this time has a current value of (VB-VBE(SAT))/R50. A sum current IF of the bias current IFB 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 for the output of 1 mW of the laser diode 259, the optical output of the laser diode 259 increases. When the output voltage of the operational amplifier 232 reaches approximately 2 mW and the output voltage of the operational amplifier 232 reaches approximately 1 V, the output signal of the comparator 238, that is, the laser ready signal S43 changes from OW to HIGH level. The main exposure setting signal S4 is input to one side input terminal of the comparator 234.
4 is at LOW level, a shadow exposure level (light output P(SH)>1 voltage) is applied through the analog switch 241. This voltage depends on the sensitivity characteristics of the photoreceptor 301. It is set by the shadow exposure setting volume 361. Now, the voltage is 2.OV, which corresponds to the average value of the optical output of 4 mw. Therefore, the optical output of the laser diode 259 increases and the voltage of the comparator 234 increases. The input terminal voltage is 2.
When the voltage exceeds 0V, 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 2570 also decreases, and the optical output of the laser diode 259 becomes 4.
It becomes less than mw. When the optical output of the laser diode 259 becomes 4 mW or less, the voltage at the + side input terminal of the comparator 234 also becomes 2.0 V or less, and the transistor 235 is turned off again. Then, the capacitor CO7 is charged up again through the resistors R39 and R40. Then, the laser diode 259 again fluctuates its optical output around 4 mW, and the comparator 234 repeats the 0N10FF operation at a constant cycle. Incidentally, since this comparator 234 has a hysteresis characteristic, the comparative judgment becomes stable and reliable judgment can be made. And the resistance R
39 and R40, the capacitor CO7
The voltage across the terminal approaches the value of VO2 in FIG. 20 and becomes stable. After the laser ready signal S43 becomes HIGH level, the microprocessor 101 outputs output capacitors 1 to 1.
After a predetermined time t6 has elapsed, a shadow level sample strobe signal 346 is output. When the sample strobe signal is output, the sample hold IC 245
The voltage VOI (FIG. 20) of the capacitor CO7 input to the ANALOG-INPUT input terminal is sampled and held, and the voltage is stored in the hold capacitor CO8. Therefore, after the sample strobe signal is turned off, the control voltage V for outputting the shadow level P (SH) is applied to the output OUT of the sample and hold IC.
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 S44 to the HIGH level through the output port. Therefore, the output voltage of the voltage follower 239 is applied to one input terminal of the comparator 234 through the analog switch 240. Voltage follower 2
The main exposure level (light output P (ON)) is used for the output of 39.
Voltage is being output. This voltage is determined by the main exposure setting volume 36 in the operation unit depending on the sensitivity characteristics of the photoreceptor 301.
Assume that the voltage is set to 0 and J:, and a voltage of 3, OV, corresponding to an average optical output of 6 mw, is currently being output. Therefore, the output of the comparator 234 has one side input terminal as 3. Since the voltage is switched to OV, the voltage becomes OW level, and the transistor 235 is turned off. Therefore, as the capacitor C7 is further charged up, the base voltage of the laser modulation transistor also increases, and the optical output of the laser diode 259 also increases. When the optical output of the laser diode 259 is around 6 mW, the output voltage V232 of the operational amplifier 232 is about 3 V.
become. When the output voltage of the operational amplifier 232 becomes 3V or more, the comparator 23
The output of 4 changes to HIGH and transistor 235 turns on.
, and capacitor CO7 is distributed through resistor R40. Therefore, the base voltage of the laser modulation transistor 257 also decreases, and the laser diode 259
The light output will be less than 5mW. laser diode 25
When the optical output of 9 becomes less than 6mW, the comparator 234
The + side input horn terminal voltage also becomes 3.0V or less, and the transistor 235 is turned off again. Then, the capacitor CO7 is charged up again through the resistors R39 and R40, and the optical output of the laser diode 259 becomes 6 mW or more. In this way, the comparator 234 repeats the 0N10FF operation at a constant cycle when the optical output of the laser diode 259 is around 6 mW. And the resistors R39 and R4
Due to the integral effect due to 0, the voltage of capacitor CO7 becomes
It approaches 0 figure VO2 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 the section 1 of FIG. 20a other than the write operation of the print data. Since the sample signal S45 is at the 10W level in the section between the print data S4.7 and the 'shadow data S48, the analog switch 236 is turned off. Therefore, print data D
In the printing area where the laser diode 259 is modulated by the shadow signal 848 and the shadow signal 848, the level of the optical output of the laser diode 259 is P(ON), as described above.
There are three levels: P (SH) and P (OFF). That is, first, when the print data signal S47 is OFF, i.e., 1-OW level, and the shadow signal is OF i, i.e., LOW level (the output of printing is white), the NAND gate 246 is established and the analog Only the switch 254 is turned on, the main exposure level voltage VO2 is applied to the base of the modulation transistor 257, and the optical output of the laser diode 259 is P(ON)-6mw.
becomes. Second, when the print data signal S47 is OFF and the shadow signal is ON, the NAND gate 247 is established when the printing output is half 1 to -n, and only the analog switch 255 is turned on, and the modulation transistor 257 is turned on. The base has the sample hold IC24
An output voltage VOI of −5 is applied, and the optical output of the 25 laser diodes is P(SH)−4 mw. The third case is when the print data signal S47 is ON and the shadow signal is OFF (the print output is black), and the OR gate 248 is established and only the analog switch 256 is turned ON. Therefore, the base of the modulation transistor 257 is connected to GND.
The laser diode 25 is shot because it becomes ○V.
The light output of 9 becomes P (OFF) -〇, and no light is emitted. In this manner, the first printing is performed. As soon as printing is completed, the microprocessor 101 sets the main exposure setting signal 844 to LOW level again through the output port, and resets the shadow exposure level P(SH). Therefore, the voltage at one side input terminal of the comparator 234 becomes 2.Ov, which is the set voltage of the shadow exposure level. Therefore, transistor 235 is turned on, capacitor CO7 is discharged, and VCO7 becomes smaller. In order to explain the optical output stabilization operation of the laser diode, it is assumed that during the second printing operation, the case temperature of the laser diode 344 rises to ΔT. As is clear, 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. In order to obtain the optical output of Voltage△
The optical output of Laser Dymede 259 is set to VO3 higher by v1, and the optical output of Laser Dimede 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 temperature rise of the case of the laser diode 344, and the voltage of the capacitor CO7 is set to VO4, which is higher by the correction voltage ΔV2 due to the temperature rise, and the second printing is performed after the setting. In this way, the shadow exposure level P (Sl-1) and the main exposure level P (ON) are maintained at a constant level very accurately by the function of the stabilizing circuit, making it possible to perform high-quality printing. can. Furthermore, the main exposure level P (ON)
As described above, the light amount stabilizing operation is performed to keep the light output constant at all times except when writing print data. Furthermore, for the shadow exposure level, a zumble bold operation is performed before the printing of each character is started, and a light amount stabilization operation is not performed during the print writing operation, unlike the main exposure level. This is because the circuit becomes complicated and expensive, and the shadow level is an auxiliary element compared to the fluctuation of the main exposure level, so even if it fluctuates a little, it does not have much effect on the print quality. In addition, when changing the setting voltage input to the comparator 234 according to the sensitivity characteristics of the photoreceptor 201, the adjustment is made by changing the main exposure setting volume 360. This main exposure setting volume 360 is adapted to vary the input voltage of the voltage follower 239. Therefore, by varying the main exposure setting volume 360, the light output setting voltage at P (ON) can be adjusted. On the other hand, the light output setting voltage at P (SH) is obtained by dividing the output voltage of the portie shift A lower 239 by the resistor R46 and the shadow exposure setting volume 361. Therefore, by adjusting the main exposure setting volume 360, the light output setting voltage at P (ON) and P (SH) times changes proportionally, and a constant relationship between recording density and applied voltage is established. can be kept. Therefore,
Adjustment is simplified without the need for complicated operations such as adjusting by varying the set voltage at both P(ON> and P(SH) times as in the past. Figure 21 shows the beam detection in Figure 13. This is a detailed circuit diagram of the circuit 121 and the beam detector 346. In FIG. 21, 346 is a beam detector, which uses a PIN diode with very fast response. Also, this beam detector 346 is shown in FIG. Photoreceptor 301 as shown
The pulse width and pulse generation position must be extremely accurate. Therefore, if the pulse width, pulse generation position, etc. change with each beam scan due to the rotation of the polygon mirror 313, the writing B starting point on the photoreceptor 301 will change, resulting in poor print quality. The anode side of the beam detector 346 is connected through a negative resistor R5'2 and a resistor R55 to one input terminal of a high-speed comparator 262, which is a comparison means. In addition, the + side input terminal of the comparator 262 is connected to the resistor R53 and R
A voltage divided by R54 is applied 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. In addition, a diode D is connected to the + side input of the comparator 262.
A threshold variable voltage S50 is applied through a 40° resistor R57. This threshold variable voltage S50 is the output of the analog switch 240 or the analog switch 241 (output of the first horn 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, and the +-side terminal voltage of the comparator 2#62, 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) to one side input terminal of the comparator 262.
The waveforms a and b in the figure are input. Now comparator 262
The voltage at the + side input terminal of is the 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 waveform when the sensitivity of the photoconductor 301 is low and the laser output during the main exposure is 5 mW or more, and conversely, a waveform when the sensitivity of the photoconductor is high and the laser output is 5 mW or less. As can be seen from this output waveform, the +
When the side voltage is kept constant, the output waveform is the beam detector 346
It varies greatly depending on the amount of light incident on it. Therefore, by using the variable threshold voltage S50 to correct the voltage of VO5 when the light intensity of the laser beam is large and the voltage of VO6 when it is small, the output waveform can be kept almost constant as shown in Figure 22. It is possible to maintain the FIGS. 23(A) and 23(B) 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 mm, and a response time of 4.
It is from n5ea. The laser beam 413 is scanned at a constant speed by the rotation of the polygon mirror 313 in the direction of the arrow in FIG. 23 (Δ). When the laser beam 413 passes over the light receiving element 410, an output current flows according to 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 cable 41
By attaching a mask 412 that does not allow the laser beam 413 to pass on the light-receiving surface of the laser beam 413, cracking of the output waveform when the beam passes on the end face is prevented. The mask 4
As shown in FIGS. 23A and 23B, 12 has a structure in which a square window is formed in a portion not including the end face portion of the light receiving cable 410 and the lead-out portion of the electrode wire 411, and the laser beam 413 is The light is made to fall on the light receiving element 410 only when it passes through the four corner windows.With this structure, the precision, especially the parallelism, of the window parts of the mask is increased, and the Comparator 262
An input waveform containing no noise, such as input waveform 2 in FIG. 24, can be obtained. FIG. 25 is a detailed circuit diagram of the print data loading control circuit 119 in FIG. 13. The main functions of this print data write control circuit 119 are as follows:
The parallel print data S57 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 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, 186 is an input/output port for transmitting and receiving signals necessary for control within the laser modulation circuit 120 and print data writing control circuit 119;
A counter/timer 188 controls the writing position of print data, test pattern generation, laser light output sampling, and the like. 189 is a crystal oscillator that serves as the reference clock for the image clock pulse and has an oscillation frequency of approximately 32M.
It is Hz. 190 is a circuit for generating an image clock, which generates a pulse (approximately 8 Mf-tz) corresponding to one dot, which is the minimum modulation unit of a laser beam. 191 is a control counter for serially converting print data in bytes (8 bits) received from the interface circuit; 192
is a circuit that generates a test pattern to be used during maintenance.When this circuit is selected, a test print is performed.
211 is a multiplexer for selecting test pattern data and print data from the interface circuit 122;
is a shift register 213,2 which converts the 8-bit parallel data from the multiplexer 211 into serial data;
14 is a line memory for temporarily storing print data and has a memory capacity of 4096 bits; 212 is an address counter for the line memories 213 and 214; and 215 is a decoder for producing a signal for controlling the test pattern generation circuit. Reference numerals 226, 227, and 228 are knobs 70 for synchronizing the timing of sending print data and screen data. Here, the details of the counters 187 and 188 will be explained. A counter 275 determines the timing for correcting the amount of laser light for each line (horizontal scanning line), counts based on the reference clock signal 853, and generates a sample signal S75 used for correcting the amount of light and starting the line. 276 is a counter for determining the horizontal recording start position, which is counted based on the Q7 output (video first dot unit signal) S83 from the control counter 191 and outputs a horizontal recording start position (left margin) signal 884. A counter 277 determines the recording end position in the horizontal direction, and counts based on the bidet eighth dot unit signal 883, and outputs a data write end position (write margin) signal S85. Reference numeral 278 is a counter for positioning the start of recording in the vertical direction, and it is based on the output of the gate 198 which uses the input/output port 186 to output the paper leading edge position (page top) signal 8$74 and the Q output of the flip-flop 204. A count is performed and a page top count output S76 is generated. Numeral 279 is a vertical recording end positioning counter which counts based on the output of gate 198 and outputs page end count signal 377 as described above. 280
A vertical test pattern control counter performs counting based on the Q output of the flip-flop 240 and outputs a test pattern control signal S79. FIG. 26 shows the interface circuit 12 in FIG.
2 is a detailed circuit diagram of No. 2. In FIG. 26, 263 is an input/output port that receives command data and print start command signals from the data control unit 2, and sends status data and ready status signals of the print control unit to the data control unit 2; 264 is an 8-bit latch for both command and print data. 265 is a transceiver/receiver for the interface data bus 859. Reference numeral 266 indicates a decoder for the data selection signal S60 that specifies data on the data bus S59, and 269 indicates a control circuit for the BtJsY 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-bit data bus, and S60 is a data selection signal on data bus S59.
Data on the data bus S59 is selected by a combination of two signals C0M and ID5TA. S61 is IPRDY
A signal indicating that the print control unit 100 is in a ready state. 862 is IPREQ, a signal that allows the data control unit 2 to send the print start signal IPRNT, and S63 is IPREQ.
At END, the data control section 2 receives this signal and 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 18B, and S66 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 S72 of
It is output as FF. Data on output line S72 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 content corresponding to the command is set in the status data output S71 of the input/output port 263. The set status data S71 is input to the transceiver/receiver 265. The input data is output onto the data bus S59 when the status identification signal 868 is ON. Details of the commands and statuses used in the print control unit 100 are shown in Figures 27 and 28, respectively. In FIG. 27, SR1-SR6 are status request commands corresponding to status list 6 in FIG. PSON is a power save command that reduces the power consumption of the fixing device 331, and PSOF is a command to cancel the power save state.When not recording, the power save command PSON reduces the power consumption of the fixing device 331 to save power, and when recording Sometimes 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, M1 to 9 are manual feed mode specification commands, TBM1 to 4 are top/bottom margin specification commands that specify the printing start position on paper, SOF indicates the command to forcibly turn off the shadow exposure. In Figure 28, the status indicates that paper is being fed and the paper is being conveyed into the printer, and the select switch ON indicates the operation. section select switch 354
The VSYNC request status indicates that the print control unit 100 has received a command to start printing and is now ready to receive print data, and the manual feed status indicates that the paper feed mode is manual feed mode. The status to notify, the upper/lower cassette is the cassette, the status to indicate the status of the selected cassette in paper feed mode, the top/bottom margin is the top/bottom margin selected by the top/volume margin commands (TBM1 to 4). Status indicating the state of the bottom margin, cassette size (upper row) and cassette size (lower row) status indicating the Lee is code of the installed cassette, test/maintenance status indicating the test/maintenance state, data A resend request indicates that reprinting is necessary due to a jam, etc.] Status, Wait status indicates that the printer is in a warm-up state of the fuser, and Power Save status indicates that the printer is not powered up by the power save command (PSON>). Indicates that the state is in save mode. Operator call indicates that an operator call factor of status 4 has occurred. Serviceman call indicates that a serviceman call factor of status 5 has occurred. This indicates that there are more than the specified number of sheets in the paper output tray and the tray is full. Toner pack 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. Cover open indicates that the front door is not closed. Timing error indicates that there was a problem in transferring print data. Fusing The fuser malfunction is due to burnout of fuser heater, temperature FUSE
Indicates that there is an abnormality in the fuser, such as a cut. A laser failure indicates that the laser diode does not reach its specified power or that the beam detector is unable to detect the beam. 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 to the next surface from the beam scanning starting point 416 at time O by the next surface of the polygon mirror 313. Begin beam scanning. 418 indicates the 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 the paper size 80, 424 is the right end surface, 425 is the data writing start point of the same size, 426
Similarly, do not represent the end point of data writing. Also 42
7 represents the center point of the paper. d/I is the distance from the beam scanning 418 to the A3 size writing start point, 65 is the distance to the same 6 size writing start point, 66 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. d9. dlo indicates the effective printing range in A3 and 80, respectively. As is clear from this drawing, the paper feed of this printer is centered around the paper center point 427, so the starting point for printing from the beam detector position 418 differs depending on the paper size. It is necessary to write data after a lapse of time corresponding to the distance from when the beam detector 346 detects the beam to each writing start point. Instead of performing such control, this printer does not use a paper edge feed mechanism, so it is possible to print on the entire surface of the paper. In this embodiment, the left and right margins on the left and right sides of the paper are set to 3 mm, but it is possible to set them to O. In addition, for printers that use conventional edge-feed conveyance, a margin of about 8 to 10 millimeters is usually required.
The drawback is that a fairly large portion of the paper is not printed. FIG. 30 shows the paper size and print area portion of FIG. 29 not only in the horizontal direction but also over the entire surface of the paper. In FIG. 30, 436 represents 〇 paper, and 437 represents A3 paper. 419,420°421, 422. 423
．． 424. 425. Regarding 426.427, the same position as in FIG. 29 is shown. 430 is the leading edge of the paper, 43
2 is the data writing start point in the vertical direction of the paper, 431 is A3
The trailing edge of the paper size 433 represents the end point of data writing for A3 size. 434 is the rear edge of A6 size paper, 435
Represents the end point of data writing of 〇 size. Next, the operation of the component device will be explained with reference to the time charts of FIGS. 31 and 32. Ready signal I PRDYO (S61
) becomes printable. At the same time, the print start signal IPREQO (S62) becomes active. Next, the laser enable signal is sent to DONl.
(349> 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-flops 226 to 228 in FIG. 25 are not set, so the print data signal S47 and shadow signal S48 are both O'. Since the laser enable S49 is "1", the print data is O', and the shadow signal S4a is "○", the gate 24 in FIG.
6 is established and the analog switch 254 is turned on, causing the laser diode 259 to emit light. Then, the monitor photodiode 260 operates, the operational amplifier 239 operates via the operational amplifier 232, and a laser ready signal LRDY1 (843) is generated. Next, in synchronization with the horizontal synchronizing signal H8YO (854), the counter 2
A sample signal SMPTO (S75) is generated from 75. This signal S75 is the distance d3 (distance of one line) between 416 and 417 in FIG. 29 that defines the paper size.
It is used to set the time corresponding to . This allows the light amount to be corrected for each line and is used as a line start signal. That is, this signal 375 opens the gate 193 in FIG. 25, and the sample signal S45 is generated from the gate 194.
is connected to the analog switch 2 via the gate 244 in FIG.
36 is turned on, a correction signal is given to the laser diode 259, and thus light amount correction is performed for each line. PTCTO (S76) is an output signal of a counter (page top counter) that determines the leading edge of the paper, and PECTO (S77) 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, VSYN
Send the status of the C request to the external device. Due to the stiffness, a VSYNC command is issued, and when it is received, the PTO
P (S73) appears and from that point start counting the number of lines of +"SYNC. In the same way, specify the number of lines to be written from that position (the ending position). In order to be able to change this specified value, a top margin n"l and a holatom margin n[' are provided. If the above specification is made, when VSYNC comes, PTOP will be set before the leading edge of the paper. A signal is output.For example, if a 5mm margin is required, count the number of lines including that.If the top margin deviates from 10IllIll, data corresponding to that amount will be set in the timer.Similarly, The position of the bottom can also be determined by using the timer.When the data is input to the timer, the gate is opened and counted, and the bottom position is determined by Gate 201 in Figure 25
It is. LSTO (878) is the Q output of flip-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 (84'9) shown in FIG. 25, and the set line is normally inactive, but is forced to be reset. The reset generates the Q output of the flip 70 knob 204, and the clock generation circuit 190 operates to generate the oscillator 18.
Count clocks from 9. 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. V
DATI 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, the P/S conversion shift register 210
is operated by the signal S82 from the clock generation circuit 190, but when the load signal is not applied, the output S86 is I O+ (no laser writing), and when the load signal 8888 is input, the data D5 to D12 are output. Convert and output serially. At this time, gates 207 to 209 cause 1 to 8 people to
It will be loaded every cycle. Here, the generation timing of the load signal will be explained. When there is a place where you actually want to 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 d9 in Figure 29. dlo) and write margin counter 277 (data is d11.d12 in Fig. 29).
> is. In this case, the set defines the distance between the left and right sides based on the center of the paper. HS Y
When the LST signal (S78) is output in synchronization with the NC (F? signal), the flip-flop 196 is set, which causes the gate 198 to twinkle and the counter 276 to start counting. Instead of counting every 8 bits, it counts once every 8 bits.If you set the count output that comes out every 8 bits according to the left margin NLm and right margin NRm, the count will be synchronized with the LST signal (<878). will be held. Then, it starts up after setting and outputting the count number. Therefore, the gate 201 determines the vertical direction, and the gate 199 determines the horizontal direction, so that writing is performed at the point when the outputs of both gates become (1, 1). At this timing, the load signal is output, and the data 886 from the shift register 210 is serially converted and sent. 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 DOLJT 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, LDAONl (881) will be explained with reference to FIG. 43. In this type of recording device, when the laser is not emitted over the entire axial direction of the photoconductor 301, for example, when the laser is not emitted over the entire axial direction of the photoreceptor 301, for example, a small size paper (such as B5 or A4 paper 458 not shown in FIG. 43) is emitted. In many cases, printing is only performed on the paper, and as a result, toner and the like do not adhere to the area near both ends that are not used. Further, even 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, the line data on signal LDAONI (881) is generated immediately after printing for one sheet of paper is completed, and within this generation period, the print data signal VDATI (881) is generated.
, 547), and by this operation, lines (images) 460 and 463 spanning the entire axial direction of the photoreceptor as shown in FIG. 43 are written after printing for one sheet of paper is completed. This eliminates the above drawbacks. In this case, the timing for writing line data is data LDATn that is one step before the final stage data LDATn in the data of line memory out signal LMOT1 (880).
The signal is generated when a predetermined time tx has elapsed from the falling edge of -1. Note that such lines are not necessarily written periodically after each sheet of paper has been printed, but can be set to be written every lot (for example, every 10 sheets or every 100 sheets). You may. 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 a "shadow" to the characters that are printed. . Determination as to whether or not to generate the shadow signal 348 is made by various gates 220 to 225 which alternately input data from the line memories 213 and 214, and three flip-flops 2.
26 to 228 and the gate 231 on the output side thereof. Among them, the flip 70 knob 227 is in the horizontal direction (
The flip-flop 228 contributes to determining a shadow based on a change in level in the vertical direction (line direction), and to determining a shadow based on a change in level in the vertical direction (vertical direction). That is, if the serial data to be written is read from the line memory 213 and sets the flip-flop 226, the data in the previous line direction is stored in the flip-flop 227, so for example, the current data is set to O'. When the previous data is 1', a shadow signal 848 is output. Similarly, the data of the previous line and the data of the current line are compared at the gate 223, and when the data of the current line is 0' or the data at the same horizontal position of the previous line is 1', the flip-flop is is set and a signal is generated. Incidentally, when both flip 70 tabs 227 and 228 are set, the V-do signal is also generated. This state is expressed by the shadow out signal 5OUT1 (S86) and the print data signal VOUT1 (S86) in FIG.
DAT1 (S47), shadow signal 5DAT1 (S
48). FIG. 33 shows a conventional development pattern when the shadow method is not used, and FIG. 34 shows a development pattern when the shadow method is used. In this way, when the character "OK" is printed, a shadow is added to FIG. 32, making it very easy to see. FIG. 36 is a characteristic diagram PA that intersects vertical line S1 and horizontal line S2 and shows the relationship between exposure position and exposure energy in the upper right area of the figure.
T1. PAT2 is shown in the upper left area of the figure as a characteristic diagram Q1 showing the relationship between the surface potential of the photoreceptor and exposure energy, and in the upper right area of the figure as characteristic diagrams R1 and R2 showing the relationship between the exposure position and the surface potential, respectively. In this figure, among the characters in Figs. 33 and 34, "8" in the Y direction is "14" in the Y direction.
~21'' is extracted. As shown in the figure, the third
The characteristics PAT1 and R1 of the pattern shown in FIG. 3 are different from the characteristics PAT2 and R2 of the pattern shown in FIG. In particular, regarding the development characteristics, at a certain development level L, the width D1 of R1 in FIG.
It can be seen that the width D2 of R2 in the figure is larger. FIG. 35 is a characteristic diagram showing the relationship between the exposure position and the exposure energy, and the energy of P (ON) during laser irradiation is, for example, 6 mw, and when creating a shadow part
) is, for example, 4 mW. The above shadow method can be summarized as follows. In a device that records recording 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 having first and second intensities (the 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. The third intensity (
Recording is performed with a beam of half 1 to 1), and this specific relationship can be determined by, for example, when beam scanning is performed sequentially for each horizontal line, (a) the binary data on the horizontal line is It is determined that there is a change from significant recorded data (data for forming characters) to unintentionally recorded data (data that does not contribute to character formation), and the unintentionally recorded data portion immediately after the change is subjected to a third intensity test. (b) Compare 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, and as in (a) above, extract the data from the significant recorded data. When there is a change in 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 when dealing with textual information. In this case, as shown in the flowchart in FIG. 55 (A), the microprocessor determines whether or not the flow is "Shadow", and if it is text information, the flow shifts to "Shadow" ON, and if the text information is For other types of information (for example, image information), "Shadow" is not activated and is automatically performed. The command in this case is rsON F shadow 0N10F shown in Figure 27.
It is FJ. Or on the panel part "Shadow 0N10"
An F F J switch may be provided so that the operator can select it arbitrarily. If the above-mentioned shadow method is used, if the recorded information is character information, it is possible to add a "shadow", thereby improving the print quality. Especially during high-density beam recording, the line [
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, it is possible to widen the permissible range of vertical deflection of the beam on the photoreceptor due to "plane deflection" of the polygon mirror, making it easier to process the polygon mirror.
It also has the advantage of being cheaper. In addition to character information, the shadow may also be applied to simple graphic information. Next, regarding charge correction, FIGS. 37 to 41 and 56
This will be explained with reference to the flowchart shown in the figure. FIG. 37 shows an example of a configuration in the charging high voltage power supply circuit 160, which is a configuration example of the high voltage power supply 0N10FF signal 8.
35, a voltage control circuit 445 whose operation is controlled by the voltage control circuit 445, a step-up transformer 446 which applies a frequency output to the primary side and generates a high-voltage output from the secondary side, and a step-up transformer 446 which rectifies the output of the step-up transformer 446. a high voltage rectifier circuit 447 that applies a rectified output to the charging charger 304; a current/voltage conversion circuit 450 that inputs the current flowing to the charging charger 304 and converts it into a voltage;
It is constituted by 44 operational amplifiers, one input of which is the output of this current/voltage conversion circuit 450, and the other input of which is 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 S36 will be explained in detail. As shown in FIG. 38, the photoreceptor 301 has a characteristic that its surface potential changes significantly with changes in humidity. In the figure, the horizontal axis represents temperature, and the vertical axis represents surface potential change △VO.
This shows the type of drum: 451°452.45
Each type has different characteristics. Also, the 39th
The figure shows each drum 451, 452, 45 at a temperature of 25°C.
．． 3 shows a characteristic diagram showing the relationship between the drum inflow current IO and the surface potential vO of No. 3, which is a proportional straight line. Therefore, in order to keep the surface potential constant, it is sufficient to change the drum inflow current ID. For example, for the drum with characteristic 451 in Fig. 39, to maintain the surface potential of 800V, the inflow current change amount △ID corresponding to VO is subtracted from the surface potential change amount, and for the drum with characteristic 453, the surface potential Inflow current change amount △I corresponding to △VO-O
It turns out that it is only necessary to increase D' (various characteristic data of the photoreceptor are stored in the RAM 107). Since the inflow current ID and the output current have a corresponding relationship as shown in FIG. 40, an analog signal (input voltage) to the control reference voltage generation circuit 44 in the charging high voltage power supply circuit 160
The inflow current ID can be adjusted by changing S36 to 2V, 4V, and 6V. Figure 41 shows the analog input current (D/A converter 1 in Figure 15).
For example, the temperature of the drum 301 is measured by the temperature sensor 342 (the fourteenth one).
The temperature change may be detected using a thermistor shown in the figure, and the analog control signal S36 may be applied in response to the temperature change. 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 Δ/D converter 271 converts it into a digital signal, and when the data conversion is completed, the temperature data DTn and the temperature 25
The value D△] obtained by subtracting the drum temperature data DT25 at °C is read. Next, one reference data v25 at a temperature of 25° C. is read, DV25+DΔV is calculated, and the calculation result DV'n is output to the D/A converter 165. And the address r6000J shown in FIG. 45(B)
The drum characteristic number is identified by referring to the RAM 107, and the feedback error data D△V
Read. Next, read the reference data DV25 of the poem with a temperature of 25 degrees Celsius, calculate DV25+D△V, and calculate the result D
Vn is output to the D/A converter 165. Then, Vn is applied to the analog input of the charging high voltage power supply 160 (S
36) as well as the control input signal S3 of the charging high voltage power supply 160.
5 is turned ON to perform correction. The above correction is repeated every time the temperature changes to keep the surface potential of the drum constant. Note that the characteristics of the various photoreceptors (drums) stored in the non-volatile RΔM 107 can be specified by the operator from the outside. That is, as shown in the flowchart ① in FIG. 60, once it is determined whether or not to replace the drum,
If the drum is replaced, set the drum characteristic NQ, turn on the test key, and then
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 extreme precision. Therefore, variations in the temperature characteristics of the photoreceptor itself can be alleviated, and there is an advantage that the range of specifications for the photoreceptor can be expanded. Next, flowcharts 1- and 5 in FIGS. 47 to 56
The operation of the entire apparatus will be explained with reference to the time charts shown in FIGS. 7 to 59. Here, each timer (counter) used in the following operation description will be defined. Timer A is for so-called standby operation from the start of printing until issuing VSYNC, and timer B is for VSYNC.
The data reception is controlled from NC generation to the data collection. Timers 〇 and D are used to control from the start of data transfer to registration motor stop, toner replenishment, etc., and timer E is used to finish 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 cold stop switch 328 is OFF, the bus heat sensor 123 is OFF, the temperature fuse 130 is not disconnected, and the paper ejection tray 3 is turned off.
84 is confirmed to be full (FULL), and it is further confirmed whether the mode is test print mode, maintenance mode, or replacement mode. If there is no problem, the MC relay 131 will turn on, and the fuser heater lamp 333 will turn on.
ON, the scan motor 312 turns ON and timer A (
TIMA) starts. When 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
A-t26 is timed, and the transfer charger, laser, developer motor, and developing sleeve bias are turned off, and furthermore, when the time of TIMA=t27 has elapsed, the drum motor, heat roller motor, static elimination lamp, and pre-transfer static elimination lamp are turned off. . Next, at the timing of TIMA=t29, it is determined whether the scan motor is ready or 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, after removing paper from the paper output tray, the flag for tray full 1 is set to 0', and the paper output tray counter is set. In the case of "toner bag 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 the status is ``power saving'' in ``status 3'', and if no (N), then ``out of paper'' in ``status 4'' is determined. , if YES (Y'), "Cassette paper out detection O"
It is determined whether it is NJ or not, and if no (N), there is no paper.
The flag is set to 0', and if the fixing device is ready, the "Status Way 1 to Medium" flag is set to 0'. Next I PRD
YON and IPREQON are determined, 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=toi, 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).
'T' ah bar PREQ 0FFJ.Next, it is determined whether or not timer E (IIME) is operating, and if it is operating, IN'-IME=t 30 is determined, and if yes (Y). If T IME stops, transfer shutter 3o5, peeler 1ift charger 306, developer motor 141, and fuser motor 143 are turned ON.
become. If rTIME-t is not 30J, TIME will stop and the flow will shift to ■ (see Figure 48)
. Next, TIMA starts and plaid solenoid 158
is ON, IT IMA=t I J Te developer motor 141. Static elimination lamp 302. Pre-transfer static elimination lamp 3
03. Each of the drum motors 147 is turned on. rT
Transfer charger 305.IMA=t2J. The fixing device motor 143 is turned on. When rTIMA=t 3J, the peel charger 306 is turned on.
Then, when rTIMA=t4J, TIMA is restarted from 0'. Next, whether it is "manual feed" or not.
The upper and lower cassettes are determined, and if the cassette is the upper cassette, the paper feed motor 151 is rotated forward to feed the upper cassette, and if the cassette is the lower cassette, r
After reaching TIMA=t 5J, the paper feed motor 151 is reversed to feed the lower paper. Then rTIMA=t 5J
When , the laser 344 is turned on and rl-IMA=t
When the voltage is 6J, the charger 304 is turned on. Check whether the laser is ready at rTIMA=t7j, and if yes (Y), rVS in "Status 1"
Set the "YNC request" flag to "1'. After that, start timer B (TIMB) and move to the flow shown in (Fig. 49). Next, stop the paper feed motor 151 with "rTIM△-31". , rVsYNc command received” and returns YES (Y
), it is determined whether rTIMB<t32J, and if yes (Y), TIMB is stopped, the 1st page top and 1st page end counters are started, and image writing processing is performed. Timer 〇, D (TIMC,
Avoid starting D), +'i' I MA=t 34
Press J to stop the TIMA and paper feed motor 151. Next, register motor 1 at rTIMc/f) = t 35J.
49 normal rotation, total counter 354 ON, IT I
MC/D=t36'' to determine whether the toner concentration is high or low. If the density is low, the toner supply motor 159 is turned on. [Next page end interrupt] is determined, and if yes (Y), an image writing end I PEND pulse is output. After that, the gold counter is set to +1, and the commands are "tray full", "drum replacement", and "developer replacement". If "Heat Roller Replacement" is selected, each status will be displayed. In addition, the determination result of "receive rVSYNC command" is as follows.
If no (N), the charging chip v-
t304OFF, rTIMB=t4-7J and laser 344. Break charger 304 OFF, rTIMB=
Laser 344. with t47J. Hakuli Charger 306.
Turn off each developer motor 141, FTIMB=t
Transfer charger 305.48J. Fuser motor 143
OFF, rT IMB=t 49J F tram motor 147. Static elimination lamp 302. The pre-transfer static elimination lamp 303 is turned off, and the blade solenoid 158 is turned off with "rTIMB-pierce 50". Also, in the flow of rTTMB<t 32Δ, −(N)
If so, then it is determined that rTIMB<t 33J, and no (
If N>, TIM B stop and TIM△ start. Thereafter, the blade solenoid 158 is turned ON, and at the stage of rTIMA=t1J, the developer motor 141. Drum motor 147. Static elimination lamp 302. The pre-transfer static elimination lamps 303 are each turned on. and rTIMA=t
2J, the transfer charger 305. Fuser motor 14
3 is turned ON, and when rTIMA=t3J, the peel charge t306 is turned ON. Next, it is determined whether rTIMA=t4J or not, and timer A is temporarily stopped and restarted. Then, the upper developer 141. Transfer charger 305. Hakuli Charger 306. Each of the fixing device motors 143 is turned ON3. rTIMA=t5
J turns on the laser 344, rTIM=t 6J turns on the charger 304, rTIMA=t 7J determines whether the laser is ready, and if yes (Y), TIM
Stop A (see Figure 50 above). Next, it is determined whether the toner full detection switch 126JON is ON or not, and if it is ON, a display is performed, and if it is not ON, a display is performed. Next, a judgment is made as to whether it is manual feed 11 or not.
Set the stop flag) to “1°. Next, set the timer E (T
Start IME>. If the stop flag is 1', set 5TPF to O'' and turn print ready IPRDY to OFF. If 5TPF is not 1, set to "manual feed 1".
A determination is made as to whether or not the
Stop, manual stop switch 328 OFF,
It is determined whether the manual feed O', the TIMB stop, and the cassette paper out detection switch are ON, and then the print request IPREQ is turned ON, and the process shifts to the flow shown in (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 Δ, B, C, D, and E is in operation, and counts up when each one is in operation. Read all input information in the port input reading part. Then, the timer is stopped when rTIMC/D=t 38J, and it is determined whether rTIvE=t39J. From then on, the operation of timer E (TIME) is continued, and one toner replenishment motor 159J, r resist mole 149" is stopped. Then rTIME-
14, it is determined whether or not the rTIMA is in operation (this is to determine whether the next sheet of paper is to be printed). -If rlMA is in operation, stop TIME. After that, the charger 304 is turned off at [TIME=t 41J. rTIME=t 42J and laser 344. Hakuri Charge 306. Each developer motor 141 is turned off. Transfer charger 305 with rl1ME=t 43J
．． Turn off each fuser motor 143, rTIME=
At t44i, the drum motor 147, the static elimination lamp 302. The pre-transfer static elimination lamps 303 are each turned off (see FIG. 52). rTIME=t 45J and plaid solenoid 158O
FF, TIME stop, determination of whether "Fuser temperature is normal" or not, "Fuser temperature fuse stage", "Scan motor 312 ready", and "Door switch 129 OFF" are determined, depending on each state. , various processes are performed. Next, the contents of the command interruption in each flow will be explained with reference to FIG. 54. When command interrupt processing is started, it is determined whether or not there is a "parity error", and if it is an error, the flag of the status DATA 81J becomes 1', indicating an "illegal command error". If it is not a “parity error”, the [status request] is SR1~
6, and if it is within the range, an output corresponding to one of them is generated. If none of the [Status Requests] apply, it is determined whether or not it is the "Top/Bottom Margin", and if so, the "Top/Bottom Margin" is specified and the "Status Set" is set to 1'.
Then, any one of "rDATΔ21 to 11" is specified. If it is not [Top/Bottom Margin], it is determined whether "Manual Feed Designation" is selected, and if yes (Y), then the manual feed display and paper size display are performed, and the paper size register is set.Then, the manual feed status is set. The status becomes 1 and "DATA41J flag becomes 1',
Next, in status 4, the flow shifts to a flow in which the paper out flag becomes O'. If it is not "1 manual feed specification", it is determined whether or not "1 cassette specification" is specified, and if it is "cassette specification", the upper/lower
The lower display paper size is displayed, the paper size register is set, the manual feed status is reset, the status becomes 1, DT△417 lag 0', it is determined whether there is no paper in the cassette, and if there is no paper, the flag is set to 1'. becomes. "
If the cassette is not specified, the "Select lamp lights up"
It is determined whether or not the online select lamp (specified by an external device, for example, the host side) is lit. If YES (Y), the select lamp is lit, and if the select lamp is not lit, It is determined whether or not the select lamp is off. If YES, the select lamp is turned off; if NO (N), the process moves to the next flow. Next, the flowcharts shown in FIGS. 55(A) to 55(C) will be explained. In addition to the above-mentioned "shadow method", "power save" is included in FIG. 55(A), and if "power save" is in progress, the scan motor 312 is turned off. Control the fuser to the power save temperature, set the status 3 power save flag to 1J, turn on the scan motor 312 when power save is canceled, control the fuser to the normal temperature i, and set the status 3 power save flag to O.
”, and “If the image data transfer start j is shown in Fig. 55 (B
), move to (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 5n+m, and if NO (N), the top/bottom margin change table data D2 is read. Next, the calculation of top margin table data D1+margin change table data D2 is performed, and the contents of the top margin adjustment switch (442 in FIG. 14) are read. Next, the top margin adjustment table data D3 corresponding to the switch is read, the margin adjustment table data D3 is added to and subtracted from the values of Dl and (DI+D2), and the calculation result D4 is set in the page top counter 278. And bottom margin table data D for the specified paper size
5 is read, and it is determined whether the top/bottom margin designation is 5 mm or not. If NO (N), the top/bottom margin change table data D2 is read, and the bottom margin table data D5 and the margin change table data are read. D2 is subtracted, the contents of the top margin adjustment switch 442 are read, and the top margin adjustment table data D3 corresponding to the switch is read. Next, the margin adjustment table data D3 is added to or subtracted from the value of D5 or (D5-D2), and the calculation result D4 is set in the page counter 279. Next, the light margin table data D7 for the specified paper size is read, and the cassette/
Manual feed is determined. If you select a cassette, the upper row (
The cassette upper/lower adjustment switch (Fig. 14, 44) determines whether the cassette is in the upper or lower position.
and reads the cassette upper/lower adjustment table data D8 corresponding to the switch. The D8 is added to or subtracted from the value of the D7, and the calculation result D9 or the D7 is set in the write margin counter 277. If manual feed is specified, read the contents of the cassette/manual feed adjustment switch (440 in Figure 14), read the cassette/manual feed adjustment table data D10 corresponding to the switch, and then set the adjustment table data to the value of D7. DIO is added or subtracted, and the calculation result D11 is sent to the write margin counter 277.
Set to . Next, left margin table data D1 for the specified paper size
2 is read, cassette/manual feed is determined,
If it is a cassette, it is determined whether it is the upper stage (base nu) or not. The lower adjustment table data D8 is read.The data D8 is added to or subtracted from the value of the D12,
The calculation result D13 or the data D12 is set in the left margin counter 276. In the case of manual feed, the contents of the cassette/manual feed adjustment switch 441 are read, the caret/manual feed adjustment table data D10 corresponding to the switch is read, and the data D10 and the data D are read.
12 is performed, and the calculation result D14 is set in the left margin counter 276. The details of the cassette paper printing during the aforementioned flow are shown in the time chart of FIG. 57. When the print start signal IPRNTφ (S65) is output, the print start permission signal IPREQφ (862) rises. After that, the developing device motor 141 etc. are turned on, and from time 14 to t
8, the paper feed motor 151 operates to convey the paper in the cassette. At this time, the laser diode 344 is turned on at time t5, and data writing starts from time t7 (the diagonally shaded period from time t7 to t11 is the data writing period). At time t9, the registration motor 149 rotates, and the data written on the photoreceptor is transferred to the paper. Data writing is performed until time t11 when IPREQφ (362) falls, and after time t11 elapses, the registration motor 149 continues to rotate until time t12 and stops. The laser diode 344 is then turned off at time t14. FIG. 58 and FIG. 59 are time rate diagrams for explaining the operation of printing on manual paper. In the following explanation, the differences from the case of printing on cassette paper described above will be explained. In FIGS. 58 and 59, the paper feed motor 151 is not used, and the registration motor 149 is rotated in 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 (S62) is made to rise. FIG. 58 shows a case where paper is set in the manual feed guide before the "1 manual feed command" is generated, and when the manual feed switch 326 is turned ON due to paper setting, thereafter at time tO1
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 (362) 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 as long as the manual feed command J is not issued. This is a case where the switch 326 is turned on, and in this case, after a predetermined period of time has elapsed, the registration motor 149 is continuously rotated in reverse to transport the image to the transfer position. In both cases, the manual stop switch 328 is OFF.
Time t21 after a predetermined period has passed after F (time [20)
The registration motor 149 is stopped at the end of the manual feed guide, 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, allowing the device to usage will increase. The flow transitions from the flow in Figure M47 above. The contents of ■ and @ will be explained with reference to FIG. When the test print mode is selected, the flow shifts to (2), and the print specified by the print mode No. is executed via the test key. When the maintenance mode is selected, the flow moves to ■, and the maintenance mode operation of No. specified via the test key is executed.
When the replacement mode is selected, the flow moves to ■, and it is determined whether to replace the drum or J, whether to replace the developer or replace the heat roller, and select whether to set the drum characteristic number or replace the heat roller, respectively.
The non-volatile generation RAM10 is activated via the test key by "Developer Replacement No. Set" and "Heat Roller N. Set".
Predetermined data processing for 7 is performed. FIG. 61 to FIG. 63 are correspondence diagrams showing correspondence between display numbers and respective contents. (The following is a blank space) [Effects of the Invention] As detailed above, the present invention creates adjustment data that takes into account the mechanical positional deviation of the first and second recording medium storage sections,
Since the recording start position is thereby defined, the position can be corrected without requiring any special tools. Further, since the above adjustment is performed by data processing, extremely accurate position correction can be performed.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram showing the relationship between the device and external devices in the present invention, FIG. 2 is a schematic sectional view of the print control unit (printer) in the system diagram, and FIG. 3 is the laser scanner unit in FIG. 2. 4 is a schematic perspective view showing the relationship between the paper feed section and the recording photoreceptor, FIG. 4 is a schematic diagram showing the paper feeding section shown in FIG. 6 is a plan view showing the operation panel section of the device of the present invention, FIG. 7 is an enlarged plan view of the display section in FIG. 6, and FIG. 8 is 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 block diagram of the printing control section in Figure 1, and Figure 14 is a block diagram of the printing control section in Figure 1.
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 semiconductor laser, and Figure 20 is the circuit in Figure 17. Time chart for explaining the operation, Part 2
1 is a detailed circuit diagram showing the beam detection circuit and beam detector in FIG. 13, FIGS. 22 and 24 are waveform diagrams for explaining the operation of the circuit in FIG. 21, and FIGS. B
) are front and side views showing an example of the structure of the beam detector, FIG. 25 is a detailed circuit diagram of the print data write control circuit in FIG. 13, and FIG. 26 is a circuit diagram of the interface circuit in FIG. 13. , FIG. 27 is a relationship between command abbreviations and functions used in the device of the present invention, FIG. 28 is an explanatory diagram showing the contents of status used in the device of the present invention, and FIG. 29 is a diagram of the recording photoreceptor in FIG. 3. 30 is a plan view showing the print area of the entire surface of the paper including the paper size shown in FIG. 29, and FIGS. Figure 25 is a time chart for explaining the operation of the circuit, Figures 33 and 34 are print pattern diagrams printed on paper, Figures 35 and 36 are
The figure is a characteristic diagram showing the relationship between exposure position, exposure energy, surface potential, and exposure energy and exposure position to explain the exposure control operation in the circuit of Fig. 25.
Detailed block diagram of the high voltage power supply for charging in Figure 5, No. 38
41 are characteristic diagrams for explaining the operation of the circuit in FIG. 37, FIG. 42 is a schematic diagram showing the relationship between the laser scanner unit and the recording photoreceptor in FIG. 2, and FIG.
Figure 3 is an explanatory diagram showing the relationship between the recording photoreceptor and paper, No. 44.
45(A), 46(B) and 46 are detailed views of the data recorded in each recording device in FIG. 13, and FIG. Figures to 5th
Figure 4, Figure 55 (A), (B), (C). 56 and 60 are flow charts for explaining the overall operation of the device of the present invention, FIGS. 57 to 59 are time charts for explaining the operation of the device of the present invention, and FIGS. 61 to 63 are flowcharts for explaining the overall operation of the device of the present invention. FIG. 3 is a relationship diagram showing display numbers and their contents in the invention device. 107... Memory means, 276... Recording start position clocking means 1.301.
... Recording medium, 311 ... Information recording means, 317. 321 ... Recording medium storage section, 325
... Recording medium manual supply means. "Walking i4 madness ω- Fig. 19 13 (OFF) (, 11% fB (ltA Fig. 43)

Claims (2)

[Claims] (1) In an apparatus having an information recording means for recording information on the recording medium by scanning a beam on the recording medium, the recording start position timing means for measuring the time from the scanning start position of the beam to the recording start position is different from each other. A first and a second storage device that is installed at a location and stores a plurality of recording media.
a recording medium storage section; a storage means for storing set data of a recording start position corresponding to the size of each storage section; A recording apparatus comprising: control means for creating adjustment data based on mechanical positional deviation of each paper storage section, and inputting this adjustment data to the time measurement means as set data. (2) The adjustment data is created based on a position signal corresponding to a positional deviation of the other storage sections with one of the storage sections as a reference. recording device.