JP3367009B2 - Synchronous data transmission method for printer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer device.
Takes synchronous data transmission system, and more particularly, to data transmission within a system, the filter circuit and, synchronous data transmission in the printer device provided with a programmable delay circuit for finely adjusting the phase of the synchronous clock signal and the data signal More specifically, the present invention relates to a synchronous data transmission method in a printer device suitable for use in a printer device that performs data transmission between remote CPUs.

[0002]

2. Description of the Related Art In the conventional synchronous data transmission, the output control of the synchronous clock and the synchronous data is performed at a fixed timing in advance, or the output control of the synchronous clock and the synchronous data is systematically performed with the system basic clock as a unit. ing. For example, in Japanese Unexamined Patent Publication No. 62-202624, several types of phase-shifted clocks, for example, clocks delayed by ⅛ cycle are made by the source oscillation of the oscillator, and the phase relationship between this clock and the synchronization signal By selecting an optimum clock for data acquisition and using it, data is received only with a clock having the same frequency as the data transfer frequency.

[0003]

On the other hand, in the exposure apparatus of the printer apparatus, it is usually attached to the upper part of the apparatus and the data transmission distance is long, or the input of the exposure apparatus is suitable for receiving serial transmission. In many cases, raster scan print image data is transmitted by a serial transmission method. Similarly, the transmission of serial data or some bits of parallel data between distant modules in a printer device may result in data image
It is often performed by synchronous data transmission according to a synchronous clock output from the synchronous transmitter side or the data exposure side .

In particular, in synchronous data transmission in which transmitters / receivers are separated from each other, a filter circuit for preventing unnecessary radiation noise generated during transmission is often necessary, and when passing through the filter circuit or circuit delay. Signal delay occurs when driving a large distance long-distance line. However, in the above-mentioned conventional technique, transmission line impedance matching and waveform shaping are not performed. In other words, the signal delay is not a problem due to the presence of the filter circuit in the synchronous data transmission in which the transmitting and receiving devices are separated from each other.

An object of the present invention, the pre capable of setting an optimum delay to solve this problem, to cancel the line delay
It is to provide a synchronous data transmission system in an input device . Another object of the present invention is to provide a synchronous data transmission system in a printer device capable of setting an optimum delay for canceling a line delay in a long transmission system between transmitting and receiving devices. Another object of the present invention, the Purine optimal delay adjustment operation to cancel the line delay can be easily
<br/> by providing synchronous data transmission method in a data unit Ru Oh.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses a clock synchronous data transmission.
For transmitting the Tascan print image data to the exposure device
Same as the clock for raster scan print image synchronization transmitter
Raster scan image data by receiving synchronous data
Printer including an exposure apparatus for exposing a sensitive light body as
Formed on the image synchronous transmission device side and the exposure device side in the device
Filter circuit and synchronous clock signal in the transmission system
And programmable to fine tune the phase of the data signal
A delay circuit, and the filter circuit and front
Both the delay circuits are arranged adjustable on the image synchronization transmitter side.
The synchronous data in the printer is characterized by
Data transmission method was proposed.

With this configuration, the printer
Between serial modules or
Transmission of several bits of parallel data is data image synchronization
Output from the transmitter side or the data exposure side
Synchronous data transmission according to the period clock ,
A filter circuit prevents unnecessary radiation noise generated during transmission, and the delay circuit finely adjusts and cancels the signal delay that occurs when a signal passes through the filter circuit or drives a long-distance line with a large circuit delay. can do.

Since a programmable delay circuit capable of inserting an arbitrary delay less than the system basic clock is provided in one or both of the synchronous clock and the synchronous data, the synchronous clock and the synchronous data are transmitted in the final transmission path. After making individual transmission line matching adjustments,
The phase between the synchronous clock and the synchronous data can be adjusted without affecting the transmission path matching state.

The present invention also configured adjustably arranged in the image synchronization transmitting apparatus both the filter circuit and the delay circuit. If both are placed on the image synchronization transmitter side ,
Both adjustments can be performed easily and easily without having to make adjustments at distant positions.

Further, it is preferable that the delay circuit is arranged in one of a data transmission system and a synchronous clock signal transmission system. If a delay circuit is provided in the data transmission system and the clock signal transmission system for adjustment, the total number of steps of each other can be finely adjusted, and the adjustment range is widened. If so fit the adjustment width narrower range of the circuit, adjusting the width of the delay circuit is may be a small, delay circuit feed image synchronization when the
Only the communication device side is enough.

Further, a basic clock signal oscillation source provided on the exposure apparatus side , a delay circuit for receiving a signal from the basic clock signal oscillation source and sending a synchronous clock signal, and a signal from the basic clock signal oscillation source are imaged. A first filter circuit for transmitting a clock signal transmitted to the synchronous transmission device side, a data synchronization receiving means for receiving data from the image synchronization transmission device side in synchronization with the synchronous clock signal, and an image synchronization transmission device.
The second filter circuit provided data for transmission to 置側, is restricted to the clock signal and a data transmission means for transmitting said data via said second filter circuit, exposure
It is preferable that the delay circuit provided on the device side be configured to finely adjust the phases of the synchronous clock signal and the data signal.

According to this structure, the basic clock signal oscillation source provided on the exposure apparatus side sends the basic clock signal to the image synchronous transmission apparatus side , and the data is transmitted during the sending of this signal. . Specifically, data is transmitted when the signal pulse waveform is on, and data transmission is interrupted when the signal pulse waveform is off. Therefore, it is possible to request and stop the data on the exposure apparatus side . Therefore, the day
Since it is possible to receive data by a simple operation of transmitting the basic clock signal on the exposure device side , even if the data is not transmitted on the exposure device side by inputting a signal on the image synchronization transmission device side , The command system is simplified.

In the printer device, the image
It is preferable to provide a programmable delay circuit for finely adjusting the phases of the synchronous clock signal and the data signal on the synchronous transmitter side .

According to this structure, in the synchronous data transmission in which the transmission / reception devices such as the image synchronization transmission device and the exposure device are separated from each other, unnecessary radiation noise generated during transmission from the synchronization transmission device is prevented. The signal delay generated by adjusting the filter circuit can be adjusted.

In addition, the synchronous data transmission system of the printer is applied to the printer, and the printer image drawing CPU for mainly performing image generation of the printer and the exposure timing control of the printer are provided. in the printer device and a printer engine control CPU unit, from the printer image drawing CPU unit by the clock synchronous data transmission to the printer engine control CPU unit, the programmable delay circuit for performing a command transmission provided Is preferable.

According to this structure, in the synchronous data transmission in which the transmitting and receiving devices are separated from each other like the printer image CPU device and the printer engine controlling CPU device,
The signal delay generated can be adjusted by adjusting the filter circuit for preventing unnecessary radiation noise generated during transmission.

Further, the synchronous data transmission system in the printer device is applied to the printer device, and the printer control CPU device for controlling the printer device main body and the input / output device for controlling the input / output device attached to the printer device. In a printer device including a control CPU device, the printer control CPU is provided by clock synchronous data transmission.
If a programmable delay circuit for finely adjusting the phases of the synchronous clock signal and the data signal is provided in the synchronous transmission / reception device that performs command transmission from the device to the printer input / output control CPU device or vice versa. preferable.

With this configuration, in synchronous data transmission in which the transmission / reception devices are separated from each other, such as the input / output control CPU device and the printer control CPU device, unnecessary radiation noise generated during transmission is prevented. The signal delay generated by adjusting the filter circuit can be adjusted.

Further, the synchronous data transmission system according to the present printing apparatus is applied to a printer device, and a printer control CPU unit for controlling the printer apparatus main body, paper handling devices that can be connected in or options supplied with the printer device In a printer device including a paper handling control CPU device for controlling
CP for printer control by clock synchronous data transmission
From U device to CPU device for paper handling control,
Or, conversely, it is preferable to provide a programmable delay circuit for finely adjusting the phases of the synchronous clock signal and the data signal in the synchronous transmission / reception device that transmits commands.

With this configuration, the printer control CPU device and the paper handling control CPU
In synchronous data transmission such as a device in which transmission / reception devices are separated from each other, it is possible to adjust a signal delay generated by adjusting a filter circuit for preventing unnecessary radiation noise generated during transmission.

In the above raster scan print image data transmitting apparatus, a programmable delay circuit capable of inserting an arbitrary delay less than the system basic clock into one or both of the synchronous clock and the synchronous data is provided. It is possible to adjust the phase between the synchronous clock and the synchronous data without affecting the transmission path matching state after performing the individual transmission path matching adjustments for the synchronous clock and the synchronous data in the final transmission path in the device. it can.

Further , in the synchronous data transmission system in the printer device , the print image synchronous transmission device receives the basic clock signal oscillation source and the signal from the basic clock signal oscillation source, and transmits the synchronous clock signal. A delay circuit, and a filter circuit for transmitting a clock signal from the basic clock signal oscillation source to the exposure apparatus,
A second delay circuit connected to an output terminal of the first delay circuit, and the basic clock signal oscillation source provided in the print image synchronous transmission device is used to synchronize the synchronous clock signal by the first and second delay circuits. And finely adjusting the phase of the data signal.

With this configuration, the same basic clock signal oscillation source provided in the print image synchronization transmitter is used to synchronize the transmission and reception by the first and second delay circuits. The adjustment width of the delay circuit can be set to be the same for both the first and second delay circuits. In other words, when different basic clock signal oscillation sources are used, the delay circuit is designed according to the basic clock of the oscillation source. However, the same delay circuit may be provided to use the same oscillation source.

Further, the synchronous data transmission system in the printer device is applied to the printer device, and the printer image drawing CPU device for mainly performing the image generation of the printer device and the exposure timing control of the printer device are performed. in the printer device and a printer engine control CPU unit, from the printer image drawing CPU unit by the clock synchronous data transmission to the printer engine control CPU unit, the programmable delay circuit for performing a command transmission provided Is preferable.

With this configuration, in the synchronous data transmission in which the transmission / reception devices are separated from each other like the printer image CPU device and the printer engine control CPU device,
The signal delay generated can be adjusted by adjusting the filter circuit for preventing unnecessary radiation noise generated during transmission.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be exemplarily described in detail below with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Only.

FIG. 1 shows a burst transfer type synchronous transmission / reception apparatus ( image synchronous transmission apparatus 1A, exposure apparatus side reception apparatus 2).
2A is a schematic configuration diagram of a circuit showing A), and FIG. 2 is a data request type synchronous transmission / reception apparatus ( image synchronous transmission apparatus 1B, exposure apparatus)
FIG. 3 shows a schematic configuration diagram of a circuit showing the receiving device 2B).
Synchronous transmission / reception device ( image synchronous transmission device 1C, exposure device side reception device 2C) according to another embodiment of burst transfer type
4 is a schematic configuration diagram of a circuit showing the synchronous transmission / transmission / reception devices 27 and 28, FIG. 5 is a waveform diagram of the adjustment points 14 and 15, and FIG. 6 is a raster scan of the printer device. FIG. 7 is a block diagram of the print image generation device.
8 is a block diagram of an exposure device of the printer device, FIG. 8 is a block diagram of a raster scan print image generation device of the printer device and an exposure device according to another embodiment, and FIG. 9 is a printer image drawing CPU device 36. CP for printer engine control
10 is a block diagram showing the relationship between the U device 37, FIG. 10 is a block diagram showing the relationship between the keyboard device 45 and the printer control CPU device 46, and FIG. 11 is a relationship between the printer control CPU device 55 and the optional paper feeding device 54. It is a block diagram shown.

In FIG. 1, an image synchronous transmitter 1A and a dew unit are shown.
The optical device side receiver 2A is connected by a transmission line 10, 3 is transmission synchronization data, 4 is transmission synchronization clock, 5 is reception data, and 6 is reception synchronization clock. Image synchronous transmission
A programmable delay circuit 7 including a data-side delay circuit 7A and a clock-side delay circuit 7B is provided in the communication device 1A, and the delay circuit 7 is connected to rotary switch type adjusting means 60A and 60B, and the adjustment is performed. The means is connected to the line driver 8 and the filter circuit 9, and the transmission line 1
0 is connected to the exposure apparatus side receiving apparatus 2A.

In the exposure apparatus side receiver 2A, the terminal end 11A connected to the data transmission line 10A is connected to the line receiver 12A, and the line receiver 12A is D
It is connected to the D terminal of the flip-flop 13A. Further, the terminal end 11B connected to the transmission line 10B is connected to the line receiver 12B, and the line receiver 12B is connected to the C terminal of the D flip-flop 13A.
The data adjustment point 14 and the clock adjustment point 15 provided on the input side of the flip-flop 13A are points for observing the waveforms of the points by connecting to a measuring instrument such as an oscilloscope.

In the first embodiment of FIG. 1, the exposure apparatus side receiver is used.
This is an example of using a burst transfer type synchronous transmission / reception apparatus in which a data request / stop operation cannot be performed on the device 2 side. Image same
In the automatic transmission device 1A, both the reception synchronization data 3 and the transmission synchronization clock 4 pass through the programmable delay circuit 7 that can be set arbitrarily, and then are adjusted to a predetermined voltage / current level by the line driver 8 to adjust the filter circuit 9. Waveform shaping, impedance adjustment, and unwanted radiation removal measures are taken.

Therefore, the transmission synchronization data and the transmission synchronization clock signal that have passed through the filter circuit 9 are sent to the transmission line 10, but the signal of the transmission line 10 has few unnecessary frequency components. In the exposure apparatus side receiving device 2A, the impedance is adjusted and the voltage level is adjusted, and then the line receiver 12 receives the light by the terminal 11. Using the data and clock signal received by the line receiver 12, data is sampled by the flip-flop 13A and received by the exposure apparatus as received data 5.
It is used by the communication device 2A.

In the exposure apparatus side receiver 2A, image synchronous transmission is performed.
A data adjustment point 14 and a clock adjustment point 15 are provided for adjusting the programmable delay circuit 7 of the device 1A. That is, while observing the waveform at the adjustment point as shown in FIG. 5, the adjustment means 6 of the data side delay circuit 7A
0A or adjusting means 60B of the clock side delay circuit 7B
Is operated or both adjusting means 60A and 60B are adjusted to adjust the time constant of the delay circuit 7.

As described above, in the synchronous data transmission in which the transmitting and receiving devices are separated from each other, the unnecessary radiation noise generated during the transmission is prevented by the filter circuit 9, and when the signal passes through the filter circuit 9 or the circuit delay occurs. The signal delay that occurs when driving a large long-distance line can be finely adjusted and canceled by the delay circuit 7.

Since the programmable delay circuit 7 capable of inserting an arbitrary delay less than the system basic clock is provided in one or both of the synchronization clock and the synchronization data, the synchronization clock and the synchronization clock are synchronized in the final transmission path. After the individual transmission line matching adjustment is performed on the data, the phase between the synchronous clock and the synchronous data can be adjusted without affecting the transmission line matching state.

[0035] In this embodiment, the since filter circuit and is configured to adjustably arranged in the image synchronization transmitting apparatus both the delay circuit, placing them in the image synchronous transmission apparatus, data from the image synchronization transmission apparatus Also, the operation of starting transmission of the clock signal and the adjustment of the two can be concentratedly provided on the transmitter side without having to be performed at separate positions, and the adjusting operation can be performed easily and easily.

The delay circuit is provided in each of the data transmission system and the synchronous clock signal transmission system, but the present invention is not limited to this, and is arranged in one of the data transmission system or the synchronous clock signal transmission system. It may be configured as follows. If a delay circuit is provided in the data transmission system and the clock signal transmission system for adjustment, the total number of steps can be finely adjusted and the adjustment range is widened. If the adjustment range of (1) can be controlled within a narrow range, the adjustment range of the delay circuit can be small, and in that case, only one delay circuit is required.

FIG. 2 is a schematic circuit diagram of a data request type synchronous transmission / reception apparatus according to the second embodiment. In this type, the data request / stop operation can be performed on the exposure apparatus side by the transmission request synchronization basic clock 16A. The same parts as those in FIG. In Figure 2, image synchronization
The transmission device 1B and the exposure device side reception device 2B are connected by a transmission line 10, and transmission synchronization data 3 is transmitted to the image synchronization transmission device 1B by a line driver 8A and a filter circuit 9.
Exposure device side receiving device 2B via A and the transmission line 10A
It is connected to the. Further, the image synchronization transmitter 1B is configured to receive the transmission control clock 16B from the basic clock 16A of the exposure device side receiver 2B, which will be described later, via the line receiver 12B.

In the exposure apparatus side receiver 2B, the terminal 11A connected to the data transmission line 10A is connected to the line receiver 12A, and the line receiver 12A is connected to the D terminal of the D flip-flop 13B. Further, a programmable delay circuit 7 including a clock side delay circuit 7C in which the basic clock 16A enters the input terminal 61 is provided, and the delay circuit 7C is provided with a D flip-flop 13B via a rotary switch type adjusting means 60C. Is connected to the C terminal.

The input terminal 61 is connected to a line receiver 12B via a line driver 8B, a filter circuit 9B and a transmission line 10B, and the line receiver 12B is connected to the line receiver 12B.
Image synchronization transmission by the clock signal 16B transmitted to
The data 3 of the apparatus 1B is transferred to the exposure apparatus side via the transmission line 10A.
It is configured to be transmitted to the receiving device 2B. With such a configuration, the basic clock signal transmission source provided on the exposure apparatus side transmits the basic clock signal 16A to the image synchronization transmission apparatus side, and data is transmitted during the transmission of this signal.

The second embodiment is similar to the flip-flop 13B.
While observing the waveform at the data adjustment point 14 and the clock adjustment point 15 provided on the input side of FIG.
As shown in, the adjusting means 60C of the clock side delay circuit 7C of the exposure apparatus side receiver 2B is operated to adjust the time constant of the delay circuit.

As described above, the basic clock signal oscillation source provided on the exposure apparatus side sends the basic clock signal 16A to the image synchronous transmission apparatus side, and data is transmitted during the sending of this signal. Specifically, the signal pulse waveform 16
When B is on, data is transmitted, and when it is off, data transmission is interrupted. Therefore, it is possible to request and stop the data on the exposure apparatus side. Therefore, it is possible to receive the data by a simple operation of transmitting the basic clock signal 16A on the exposure device side, even if a signal is not separately transmitted on the image synchronization transmission device side and the data is transmitted to the exposure device side. The system is simplified.

In the synchronous data transmission in which the transmission / reception devices of the image synchronous transmission device side and the exposure device are separated from each other, unnecessary radiation noise generated at the time of transmission is prevented by the filter circuit 9, and the signal is transmitted to the filter circuit. The signal delay generated when the signal passes through 9 or when driving a long distance line having a large circuit delay can be finely adjusted by the delay circuit 7 to cancel it.

Since the programmable delay circuit 7 capable of inserting an arbitrary delay less than the system basic clock is provided on the synchronous clock side, the synchronous clock and the synchronous data are individually filtered in the final transmission path. After the transmission line matching adjustment is performed by 9, the phase between the synchronization clock and the synchronization data can be adjusted without affecting the transmission line matching state.

FIG. 3 is a schematic circuit diagram of another synchronous transmission / reception apparatus of the data request type according to the third embodiment. In the figure, the image synchronization transmitter 1C and the exposure device side receiver 2
C is connected by a transmission line 10, 3 is transmission synchronization data, 4 is transmission synchronization clock, 5 is reception data, and 6 is reception synchronization clock. In the image synchronization transmitter 1C,
The line driver 8 and the filter circuit 9 are connected, and the transmission line 10 is connected to the exposure apparatus side receiver 2C.

In the exposure apparatus side receiving device 2C, the terminal end 11E connected to the data transmission line 10E is connected to the line receiver 12E, the line receiver 12E is connected to the data side delay circuit 7A, and this delay circuit 7A is It is connected to the D terminal of the D flip-flop 13E via a rotary switch type adjusting means 60A. Further, the terminal end 11F connected to the transmission line 10F is connected to the line receiver 12F, and the line receiver 12F is connected to the clock side delay circuit 7B.
Through the rotary switch type adjusting means 60B,
It is connected to the C terminal of the D flip-flop 13E.
The D terminal and the C terminal provided on the input side of the flip-flop 13E are connected to a measuring instrument such as an oscilloscope and the waveform at that point is observed.

In the third embodiment of FIG. 3, the exposure apparatus side receiver is used.
This is an example of using a burst transfer type synchronous transmission / reception apparatus in which a data request / stop operation cannot be performed on the device 2C side. image
In the synchronous transmission device 1C, the reception synchronization data 3 and the transmission synchronization clock 4 are subjected to waveform shaping, impedance adjustment, and unwanted radiation removal measures by adjusting the filter circuit 9. Therefore, the transmission synchronization data and the transmission synchronization clock signal that have passed through the filter circuit 9 are sent to the transmission line 10, but the signal of the transmission line 10 has few unnecessary frequency components.

In the exposure apparatus side receiver 2C, impedance adjustment and voltage level adjustment are performed, and then the line receiver 12 connected to the termination 11 receives the light .
In the exposure apparatus side receiver 2C, the programmable delay circuits 7A and 7B are connected and connected to the D flip-flop 13E via the adjusting means 60A and 60B, and the adjusting means 6 is connected.
The time constant of the delay circuit 7 is adjusted by operating the adjusting means 60A of the data side delay circuit 7A or the adjusting means 60B of the clock side delay circuit 7B while observing the waveforms of the terminals 0A and 60B. Then, using the data and the clock signal received by the line receiver 12, data is sampled by the flip-flop 13E and used as received data 5 in the exposure apparatus side receiving apparatus 2C.

As described above, the image synchronous transmission device side and the exposure
In synchronous data transmission where the transmitter and receiver of the optical device are separated,
A filter circuit 9 prevents unnecessary radiation noise generated during transmission, and a delay circuit 7 finely adjusts a signal delay generated when a signal passes through the filter circuit 9 or when driving a long distance line with a large circuit delay. And can be offset.

Since the programmable delay circuit 7 capable of inserting an arbitrary delay less than the system basic clock is provided in both the synchronous clock and the synchronous data, the synchronous clock and the synchronous data are transmitted in the final transmission path. After performing the individual transmission line matching adjustments, the phase between the synchronization clock and the synchronization data can be adjusted without affecting the transmission line matching state.

FIG. 4 is a schematic configuration diagram of a circuit showing the synchronous transmission / reception devices 27 and 28 according to the fourth embodiment. In the figure, the image synchronous transmission device side, the transmission / reception device 27 and the transmission / reception device 28 of the exposure device are each composed of three transmission lines
They are connected by C and 10D, 3A and 3B are transmission synchronization data, 4 is a basic clock, 5A and 5B are reception data, and 6A and 6B are reception synchronization clocks. In the image synchronization transmitter side transmitter / receiver 27, the data side delay circuit 7 is provided.
A programmable delay circuit 7 including A, a clock side delay circuit 7B, and 7D is provided, and the delay circuit 7 is a rotary switch type adjusting means 60A, 60B, 6
It is connected to 0D.

The adjusting means 60A is a line driver 8
A, the filter circuit 9A, and the transmission / reception device 28 via the transmission line 10A. Also, the adjusting means 60B
Is connected to the line driver 8B and the filter circuit 9B, and is connected to the transmission / reception device 28 via the transmission line 10D. Further, the connecting terminal of the adjusting means 60B and the line driver 8B is connected to the delay circuit 7D, and the delay circuit 7D is connected to the C terminal of the D flip-flop 13D via the adjusting means 60D. Then, the flip-flop 13
The D terminal of D is connected to the transmission line 10 via the line receiver 12D.
It is connected to C.

In the exposure apparatus side transmitter / receiver 28, the terminal end 11A connected to the data transmission line 10A is connected to the line receiver 12A, and the line receiver 12A is connected to the D terminal of the D flip-flop 13C.
The terminal 11C connected to the transmission line 10D is connected to the line receiver 12C, and the line receiver 12C
Is connected to the C terminal of the D flip-flop 13C. The line driver 8D is the filter circuit 9C.
It is connected to the transmission line 10C via.

The image synchronization transmitter side transmitter / receiver 27 passes through the programmable delay circuits 7A and 7B in which both the reception synchronization data 3 and the basic clock 4 can be arbitrarily set.
The line drivers 8A and 8B adjust the voltage to a predetermined voltage and current level, and the filter circuits 9A and 9B take measures for waveform shaping, impedance adjustment, and removal of unnecessary radiation.

Therefore, the transmission synchronization data and the basic clock signal that have passed through the filter circuits 9A and 9B are transmitted by the transmission line 10
Although transmitted to A and 10D, the signal on the transmission line 10 has few unnecessary frequency components. Then, in the exposure apparatus-side transceiver 28, the data signal 3A is received by the line receiver 12A connected to the terminal end 11A after impedance adjustment and voltage level adjustment. Flip-flop 13C using the data and clock signals received by line receivers 12A and 12C
The data is sampled according to and is used as the received data 5A by the transmitter / receiver 28 on the exposure apparatus side.

In the exposure apparatus side transmitter / receiver 28, the adjusting means 60A of the data side delay circuit 7A or the adjusting means 60B of the clock side delay circuit 7B is operated while observing the waveforms of the D and C terminals of the flip-flop 13C. do it,
Alternatively, both adjusting means 60A and 60B are adjusted to adjust the time constant of the delay circuit 7. Further, in the image transmitting / receiving apparatus side transmitting / receiving apparatus 27, the data signal 3B is subjected to impedance adjustment and voltage level adjustment, and then received by the flip-flop 13D via the line receiver 12D connected to the terminal end 11D. On the other hand, the basic clock signal 4
After passing through the delay circuit 7B, the time constant is adjusted by the delay circuit 7D, the data is sampled by the flip-flop 13D, and the data is used as the received data 5B in the transceiver 27.

As described above, the first basic clock signal oscillation source provided in the one transmitter / receiver is used to perform the first
Since the transmission and reception are synchronized by the second and second delay circuits, the adjustment width of the delay circuit can be set to be the same in both the first and second delay circuits, in other words, different basic clock signal oscillation sources are used. In that case, it is necessary to design the delay circuit according to the basic clock of the oscillation source, but the same delay circuit may be provided to use the same oscillation source.

As described above, the image synchronous transmitter side and the exposure side are
In synchronous data transmission in which the transmitting and receiving devices on the optical device side are separated from each other, unnecessary radiant noise generated during transmission is eliminated by the filter circuit 9.
The signal delay generated when the signal passes through the filter circuit 9 or when driving a long-distance line having a large circuit delay can be finely adjusted and canceled by the delay circuit 7.

Since the programmable delay circuit 7 capable of inserting an arbitrary delay less than the system basic clock is provided in both the synchronous clock and the synchronous data, the synchronous clock and the synchronous data are transmitted in the final transmission path. After performing the individual transmission line matching adjustments, the phase between the synchronization clock and the synchronization data can be adjusted without affecting the transmission line matching state.

The delay circuit is provided in each of the data transmission system and the synchronous clock signal transmission system, but the present invention is not limited to this, and may be arranged only in the synchronous clock signal transmission system. It's good. If a delay circuit is provided in the data transmission system and the clock signal transmission system for adjustment, the total number of steps of each other can be finely adjusted, and the adjustment range is widened. If the adjustment range of the circuit can be controlled within a narrow range, the adjustment range of the delay circuit can be small,
In that case, only one delay circuit is required.

[0060] Figure 6 is a block diagram of a raster scanning print image generating apparatus of the image synchronization transmission apparatus 1A, 1 7 dew
FIG. 3 is a configuration diagram of an exposure device of the optical device side reception device 2A, which are connected to each other by a transmission line 10. Image synchronous transmission
On the input side of the device 1A, a dynamic R for recording an image
An AM 22 is provided, the RAM 22 is connected to a data input terminal via a shift register 21, and a clock input terminal is connected to the shift register 21 via a sweep clock source 20.

On the other hand, the data output terminal of the exposure apparatus side receiving device 2A has a shift register 23, a data latch circuit 24, and L.
It is connected to the ED array 25, and the clock output terminal is connected to the shift register 23. In the raster scan print image generation device of FIG. 6, image data is generated in the dynamic RAM 22 and stored in the raster scan storage order.

At the time of synchronous output, the image data is sequentially read from the dynamic RAM 22 to the shift register 21, and the shift register 21 serializes the image data in synchronization with the clock from the sweep clock source 20 to perform image synchronization.
Send to the transmitter 1A. As described above, the image synchronous transmission instrumentation
After performing the transmission path matching adjustment by the filter circuit 9, the apparatus 1A can adjust the phase between the synchronous clock and the synchronous data without affecting the transmission path matching state. Therefore, the synchronous clock and the synchronous data are transmitted to the transmission line 10.

In the exposure apparatus of FIG. 7, the receiving apparatus 2A on the exposure apparatus side receives the synchronous clock and the synchronous data from the transmission line 10, and receives the data by sampling. The received data is transferred to N by the shift register 23.
It is converted into parallel data of bits, accumulated in the data latch 24, and lights the LED array 25. LED array 2
By turning on 5, the photosensitive drum 26 is exposed.

Since this embodiment is constructed in this way, the image
In synchronous data transmission in which the transmitting and receiving devices are separated from each other such as the synchronous transmitting device and the exposure device side receiving device, unnecessary radiation noise generated at the time of transmission is prevented by the filter circuit 9, and when a signal passes through the filter circuit 9, Alternatively, the signal delay that occurs when driving a long-distance line with a large circuit delay can be finely adjusted and canceled by the delay circuit 7, and good image formation can be performed on the photoconductor 26.

Since the programmable delay circuit 7 capable of inserting an arbitrary delay less than the system basic clock is provided in one or both of the synchronous clock and the synchronous data, the synchronous clock and the synchronous clock are synchronized in the final transmission path. After the individual transmission line matching adjustment is performed on the data, the phase between the synchronous clock and the synchronous data can be adjusted without affecting the transmission line matching state, and good image formation can be performed.

Next, another embodiment of the raster scan print image generating apparatus and the exposure apparatus will be described with reference to FIG. The same parts as those in FIGS. 6 and 7 are designated by the same reference numerals. Image synchronization transmitter
The input side of the location 1B, dynamic RA to record the image
M22 is provided, and the RAM22 is a shift register 2
The data input terminal 1Ba is connected via 1 and the clock terminal 1Bb is connected to the shift register 21.

On the other hand, the data output terminal of the exposure apparatus side receiving device 2B has a shift register 23, a data latch circuit 24, and L.
It is connected to the ED array 25, and the clock output terminal is connected to the shift register 23. In the raster scan print image generation device of FIG. 8, image data is generated in the dynamic RAM 22 and stored in the raster scan storage order.

[0068] At the time synchronization output, the image data are sequentially read out from the dynamic RAM22 into the shift register 21, shift register 21, the image same to serialize the image data in synchronization with the basic clock signal as described in FIG. 2
It is sent to the term transmitter 1B. As mentioned above, image synchronous transmission
The device 1B can adjust the phase between the synchronization clock and the synchronization data without affecting the transmission path matching state after performing the transmission path matching adjustment by the filter circuit 9. Therefore, the synchronous clock and the synchronous data are transmitted to the transmission line 10.

In the exposure apparatus of FIG. 8, the exposure apparatus side receiving apparatus 2B receives the synchronous data from the transmission line 10 and receives the data by sampling with the delay adjusted clock disclosed in FIG. The received data is converted into N-bit parallel data by the shift register 23, accumulated in the data latch 24, and the LED array 25 is turned on. The photoconductor drum 26 is exposed by the lighting of the LED array 25.

[0070] Since this embodiment is constructed as this, Las
In synchronous data transmission in which the transmission / reception devices are separated from each other , such as the ta-scan print image generation device and the exposure device, unnecessary radiation noise generated during transmission is prevented by the filter circuit 9, and when a signal passes through the filter circuit 9, Alternatively, the signal delay that occurs when driving a long-distance line with a large circuit delay can be finely adjusted and canceled by the delay circuit 7, and good image formation can be performed on the photoconductor 26.

As described above, this embodiment is based on the image synchronous transmission.
Since the device disclosed in FIG. 2 is used for the receiving device and the receiving device on the exposure device side , the basic clock signal 16 is sent from the oscillation source of the basic clock signal provided on the exposure device side to the image synchronization transmitting device side. Data is transmitted during the transmission of. Specifically, data is transmitted when the signal pulse waveform 16B is on, and data transmission is interrupted when the signal pulse waveform 16B is off. Therefore, it is possible to request and stop the data on the exposure apparatus side . Therefore, the image
Without transmitting data to the exposure device side put signal in the same period the transmitting device side, it is possible to receive the data by a simple operation of transmitting a reference clock signal 16 in the exposure apparatus, simplifying the instruction system To be done.

Next, by synchronous data transfer, the synchronous transmission / reception devices 27 and 28 for transmitting commands from the printer image drawing CPU device 36 to the printer engine control CPU device 37 or vice versa are provided in the respective CPU devices. An example of this is shown in FIG. Both the printer image drawing CPU device 36 and the printer engine control CPU device 37 are controllers 33 and 34, command sending parallel-serial conversion shift registers 29 and 32, command receiving serial-parallel conversion shift registers 31 and 3, respectively.
0, and has the synchronous transmission / reception devices 27 and 28 disclosed in FIG.

As shown in FIG. 4, the synchronous transmission / reception device 27 is a transmission / reception device having both the transmission unit 1 in FIG. 1 and the reception unit 2 in FIG.
Is a transmission / reception device that has both the transmission unit 1 in FIG. 2 and the reception unit 2 in FIG.

The data 3A read out from the controller 33 in the printer image drawing CPU device 36 to the transmission shift register 29 is sent to the synchronous transmission / reception device 27. Filtered data 3A and the clock signal with the synchronous transmission transceiver within 27 is sent to the transmission unit 35, the signal on the transmission line 35 is made as small unwanted frequency components. And the flip-flop 13C
Received data 5 by sampling data according to (Fig. 4)
A is sent to the controller 34 via the reception shift register 30.

Similarly, a printer engine control C
The data 3B read from the controller 34 in the PU device 37 to the transmission shift register 32 is sent to the synchronous transmission transmission / reception device 28. The data signal filtered in the synchronous transmission / reception device 28 is sent to the transmission unit 35, but the signal on the transmission line 35 has few unnecessary frequency components. Then, data sampling is performed by the flip-flop 13D (FIG. 4), and received data 5B is received through the reception shift register 31 to the controller 33.
Sent to.

In the present embodiment, as described above, in the synchronous data transmission in which the transmission / reception devices such as the printer image drawing CPU device and the printer engine control CPU device are separated from each other, unnecessary radiation noise generated at the time of transmission is generated. It is possible to adjust the signal delay caused by adjusting the filter circuit for preventing the above.

Since the same basic clock signal oscillation source provided in the one transmitter / receiver is used to synchronize the transmission and the reception by the first and second delay circuits, The adjustment width can be set to be the same for both the first and second delay circuits. In other words, when different basic clock signal oscillation sources are used, it is necessary to design the delay circuit according to the basic clock of the oscillation source. However, the same delay circuit may be provided to use the same oscillation source.

In FIG. 10, the key press information is transmitted from the operation instruction keyboard device 45 to the printer control CPU device 46 by the synchronous data transfer by the synchronous transmission / reception devices 1C and 2C.
This is an example of using. In the keyboard device 45, the keyboard controller 42 constantly scans the key matrix circuit 43 to detect a change in key depression state. When the key press state changes, the keyboard controller 42 outputs the key press state change information to the transmission shift register 40. The key press state change information serial data is sent to the synchronous transmission transmitter 1C and is sent to the transmission line 10 together with the synchronous clock. The signal on the transmission line 10 has few unnecessary frequency components.

As described above, the input / output control CPU
In synchronous data transmission in which the apparatus and the transmission / reception apparatus such as the printer control CPU apparatus are separated from each other, a signal delay generated by adjusting a filter circuit for preventing unnecessary radiation noise generated at the time of transmission is adjusted. You can

Next, FIG. 11 shows an example in which the optional paper feed device 54 is controlled from the printer control CPU device 55 by the synchronous data transfer. The synchronous transmission clock and the synchronous transmission data with a small unnecessary frequency component transmitted from the synchronous transmission transmitter 2A to the transmission path 10 are stored in the optional sheet feeding device 5
4 is received by the synchronous transmission / reception device 1A in FIG.

With this configuration, the printer control CPU device and the paper handling control CPU
In synchronous data transmission such as a device in which transmission / reception devices are separated from each other, it is possible to adjust a signal delay generated by adjusting a filter circuit for preventing unnecessary radiation noise generated during transmission.

In the above-described printer device, a programmable delay circuit capable of inserting an arbitrary delay less than the system basic clock is provided in one or both of the synchronous clock and the synchronous data. It is possible to adjust the phase between the synchronization clock and the synchronization data without affecting the transmission path matching state after performing the individual transmission path matching adjustments on the synchronization clock and the synchronization data on different transmission paths.

As described above, according to the present embodiment, in the printer device for transmitting the raster scan print image data from the image generating device to the exposure light source device by the synchronous serial transmission system, the phase between the synchronous clock and the synchronous data and the transmission path. Since both impedance matching can be adjusted independently, it is not necessary to be aware of the influence of the delay when designing the filter circuit. Further, since it is not necessary to form the same filter circuit on the data and clock lines for the phase adjustment, it is possible to form a low-cost filter circuit that focuses only on waveform shaping. Furthermore, the noise synchronized with the transmission speed from the parallel transmission lines such as the common impedance can be canceled by the programmable delay circuit.

[0084]

As described above in detail, the present invention is applicable to a printer device which sets an optimum delay for canceling a line delay.
It is possible to provide a synchronous data transmission system that.

[Brief description of drawings]

FIG. 1 is a burst transfer type synchronous transmission / reception device ( image
FIG. 3 is a schematic configuration diagram of a circuit showing an image synchronization transmitter 1A and an exposure device side receiver 2A).

FIG. 2 is a data request type synchronous transmission / reception device ( image same).
FIG. 3 is a schematic configuration diagram of a circuit showing an initial transmission device 1B and an exposure device side reception device 2B).

FIG. 3 is a diagram illustrating a synchronous transmission / reception device ( image synchronization transmission device 1C, exposure device side reception device) according to another embodiment of a burst transfer type.
It is a schematic diagram of a circuit showing a location 2C).

FIG. 4 is a schematic configuration diagram of a circuit showing synchronous transmission / reception devices 27 and 28 of the image synchronization transmission device and the exposure device side reception device .

5 is a waveform diagram of adjustment points 14 and 15. FIG.

FIG. 6 is a block diagram of a raster scan print image generation device of the printer device.

FIG. 7 is a configuration diagram of an exposure device of the printer device.

FIG. 8 is a block configuration diagram according to another embodiment of a raster scan print image generation device and an exposure device of a printer device.

9 is a block diagram showing a relationship between a printer image drawing CPU device 36 and a printer engine control CPU device 37. FIG.

FIG. 10 is a keyboard device 45 and a printer control CPU.
It is a block diagram which shows the relationship of the apparatus 46. FIG.

FIG. 11 is a block diagram showing the relationship between the printer control CPU device 55 and the option paper feeding device 54.

[Explanation of symbols]

1Image synchronization transmitter TwoExposure device side receiver 3 Transmission synchronization data 4 basic clock 5 Received data 6 Receive synchronization clock 7 Programmable delay circuit 8 line driver 9 Filter circuit 10 transmission lines 12 line receiver 13 flip-flops 14 data adjustment points 15 clock adjustment points 16 Transmission request synchronization clock 20 sweep clock source 21, 23 shift register 22 Image memory (Dynamic RA
M) 24 data latch 25 LED array 26 Photosensitive drum 27, 28 Synchronous transmission / reception device 29, 32, 40 Transmission shift register 30 reception shift register 31, 41 Receive shift register 33, 34, 44 programmable controller 35 transmission line 36 Printer image drawing CPU device 37 CPU unit for printer engine control
Setting 42 keyboard controller 43 key matrix 45 keyboard device 46 CPU device for printer control 50 transmission shift register 51 reception shift register 52 Output latch 53 Paper feed motor 54 paper feeder 55 Printer control CPU device 57 programmable controller

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-5-219040 (JP, A) JP-A-61-148938 (JP, A) JP-A-5-189081 (JP, A) JP-A-7- 172003 (JP, A) Actual Kaihei 1-151327 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04L 7/04 H04L 7/00 H04L 25/38

Claims (4)

(57) [Claims] 1. A raster scan print image synchronous transmission device for transmitting raster scan print image data to an exposure device by clock synchronous data transmission, and synchronous data received synchronously with a clock for exposure as raster scan image data. In a printer device including an exposure device for exposing the body, a filter circuit and a programmable circuit for finely adjusting the phases of the synchronization clock signal and the data signal in a transmission system formed by the image synchronization transmission device side and the exposure device side A synchronous data transmission system in a printer, wherein the delay circuit is provided, and both the filter circuit and the delay circuit are adjustably arranged on the image synchronous transmission device side. 2. A synchronization clock is provided on the image synchronization transmitter side.
A program for finely adjusting the phase of the clock signal and the data signal.
2. A delay circuit which can be controlled is provided.
Synchronous data transmission method in the installed printer. 3.In the print image synchronous transmission device, A basic clock signal oscillation source, The signal from this basic clock signal oscillation source is received to synchronize
A first delay circuit for transmitting a lock signal, A signal from the basic clock signal oscillation source is applied to the exposure device.
A filter circuit for transmitting a clock signal that is transmitted to A second delay circuit connected to the output terminal of the first delay circuit;
Equipped with The basic clock signal provided in the print image synchronization transmitter
No. oscillation source is used to synchronize with the first and second delay circuits
The feature is that the phases of the clock signal and the data signal are finely adjusted.
The synchronous device in the printer device according to claim 1,
Data transmission method. 4.Mainly used to generate images for printer devices.
CPU device for drawing a printer image, and the printer image
Based on drawing signals generated by the image drawing CPU device
To control the exposure timing of the printer.
CPU unit for printer engine control on the linter engine side
In a printer device including The printer image drawing by the clock synchronous data transmission
From the image CPU device to the printer engine control CPU
A program for transmitting commands to the device. Available
A delay circuit is installed on the printer image drawing CPU device side.
Data transmission in a printer device characterized by
method.