JPS60147360A - Recording position correction system in multicolor recording apparatus - Google Patents

Abstract

PURPOSE:To attain to prevent color shift by correcting information supplied to a recording head, by detecting the skew amount of recording paper and moving the position of a recording head in a recorded image corresponding to said detection. CONSTITUTION:The deflection amount S of recording paper 1 in the lateral direction thereof, at the point of time when the recording paper 1 runs over a distance L' from the position of a sensor 11a toward a thermal head 2a, is detected by the sensor 11a and a skew angle thetaa is operated by a main control circuit 14. Next, information supplied from an information source 15 is supplied to the thermal head 2a after operation for rotating said information by the angle thetaa is performed. By this method, the position of information on the recording surface of the thermal head 2a is moved and said information is recorded to the normal position on the recording paper 1 by black ink. Even with respect to a thermal head 2b, a skew angle thetab is calculated and information is recorded to the normal position on the recording paper 1 by red ink. Therefore, both recorded images are coincided and the generation of ''color shift'' can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording position correction method in a multicolor recording apparatus, and particularly to a method for preventing color shift due to skew of running recording paper.

[Prior art]

BACKGROUND ART Conventionally, for example, a one-no-e type multicolor transfer type thermal recording apparatus using a plurality of thermal heads, as shown in the schematic diagram of FIG. 1, has been put into practical use.

That is, two thermal heads 2a and 2b are arranged at a predetermined distance from each other along the running direction of the recording paper 1, which runs from left to right in the figure.
One thermal head 2ald is brought into pressure contact with the recording paper 1 via an ink donor film 3a capable of transferring black ink onto the recording paper 1, while the other thermal head 2b is capable of transferring, for example, red ink onto the recording paper 1. It has a configuration in which it is brought into pressure contact with the recording paper 1 via the ink donor film 3b to be obtained. Note that 4 is a film supply roll, 5 is a film winding roll, and 6 is a pack roller.

In the above configuration, information is supplied to the thermal heads 2a and 2b in synchronization with the running of the recording paper 10, and the heating elements on the recording surfaces of the thermal heads 2a and 2b generate heat, thereby recording. It is possible to sequentially perform recording on the same area of the paper 1 using two colors of ink, black and red. □ The one shown in Fig. 2 is a multi-color transfer type thermal recording device using a multi-base method using a single thermal conductor 2C. A first portion capable of transferring red ink onto the recording paper 1 and a second portion capable of transferring, for example, red ink onto the recording paper 1 are provided alternately. The thermal head 3 is moved while running the recording paper 1 from the left to the right with the part 1 overlapped with the recording paper 1.
C and perform the first recording with black ink, then release the pressure contact of the pack roller 6 and return only the recording paper 1 to the left, and then press the second ink donor film. With the parts superimposed on the recording paper 1, information is supplied to the thermal head 3c while the recording paper 1 is running from left to right in the same way as in the first recording, and a second recording is performed using red ink. , and the recording is performed using black and red ink on the same area of the recording paper 1.

[Problems with conventional technology]

However, in the multicolor recording apparatus as described above, so-called skew, in which the recording paper 1 is deviated in the lateral direction with respect to its running direction, is likely to occur. I like this.

- occurs, as shown in FIG. 3, the black ink recorded image B (indicated by the solid line) and the red ink recorded image R (indicated by the broken line) in the same area of the recording paper L are deviated from each other. This has the disadvantage of causing so-called "color shift."

[Purpose of the invention]

Therefore, even if a skew occurs in the recording paper, the present invention corrects the information supplied to the recording head accordingly.
It is an object of the present invention to provide a recording position correction method that prevents color shift from occurring.

[Structure of the Invention] 2 In the present invention, there is provided a provisional step for detecting the amount of skew of the recording paper, and in response to this detection, the position of the recording paper on the recording surface is adjusted for recording information supplied to the recording head. The above objective is achieved by moving the .

〔Example〕

Examples of the present invention will be described in detail below.

Fig. 4 is a schematic perspective view showing the main parts of a one-pass type multicolor transfer type thermal recording device to which the recording position correction method according to the present invention is applied, and parts corresponding to those in Fig. 1 are designated with the same reference numerals. It is.

In FIG. 4, thermal heads 2a and 2b each include a heating element 1o that constitutes a recording surface. 11
& and llb are sensors for detecting the amount of lateral deviation of the recording paper 1, and are arranged at a distance in front of the thermal heads 2m and 2b, respectively, with respect to the running direction of the recording paper 1. Sensors lla and llb include a light emitting device 12 having a light emitting diode array and a recording paper 1.
The light-receiving device 13 includes a photodiode array that faces the light-emitting diode array and faces the light-emitting diode array. FIG. 5 shows a circuit diagram of the apparatus shown in FIG. 4, in which 14 is a main control circuit, 15 is an information source, 16 is a paper feed control circuit, and 17 is a motor for running the recording paper 10.

In the above-described configuration, first, the recording paper 1 is connected to the sensor l1.
From the position m to the thermal) '2alC, distance L'
The sensor l1m detects the deviation S of the recording paper 1 in the □ lateral direction at the time when the recording paper 1 has traveled by □, and the main control circuit 14 calculates the gap -angle θ*=tu-' (57).

In this case, the running direction of the recording paper 1 is inclined by θa with respect to the normal running direction. Note that the distance 1IIL' is L'
It is desirable that the relationship be ≦L. Next, the main control circuit 14
, the information to be recorded in black supplied from the information source 15 is rotated by an angle θa (the rotation direction is
(same as the one-way skew) calculation is performed and then supplied to the thermal head 2a.

As a result, the position of the information on the recording surface of the thermal head 2a is moved, and this information is recorded at a regular position on the recording paper 1 with black ink. Similarly, regarding the thermal head 2b, the detection by the sensor Ilb and the calculation by the main control circuit 14 allow
- If the information supplied to the thermal head 2b is rotated by the angle θb and then supplied to the thermal head 2b, this information will be recorded at the correct position on the recording paper 1 with red ink. Therefore, as shown in FIG. 6, the image recorded with black ink -/B and the image recorded with red ink completely match, and the occurrence of "color shift" can be prevented.

In addition, in the embodiment described above, the thermal head 2a
The information supplied to the thermal head 2a and 2b is rotated by angles θa and θb, respectively, to match the recorded images B and R of the two. However, for example, the information supplied to the thermal head 2a is not rotated and is rotated by the angles θa and θb. Even if only the supplied information is rotated by θb - θa, the seventh
As shown in the figure, both recorded images (B and R) can be matched. Furthermore, the recording position correction method according to the present invention can of course be applied to a multi-color transfer type thermal recording device using a multi-pass method. Needless to say, the present invention can also be applied to a thermal recording device or a laser recording device equipped with a plurality of drums.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, occurrence of "color shift" in a multicolor recording apparatus can be effectively avoided, and clear multicolor recording can be performed.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams of a conventional multicolor transfer type thermal recording device, Figure 3 is a diagram illustrating the occurrence of color shift, and Figure 4 is a multicolor transfer type thermal recording device using the method according to the present invention. A schematic perspective view of the main parts of the recording device, FIG. 5 is a circuit block diagram thereof,
FIGS. 6 and 7 are diagrams explaining the invention in detail. 1...Recording paper, 2m, 2b...Thermal head, 3
m, 3b... ink donor film, 10... heating element, lla, 7f on 1□b-0-, 1□199 light emitting device, =13... light receiving device, 14... main control circuit , 15... Information source, 16... Paper feed control circuit, 17
···motor.

Claims (1)

[Claims] In a recording position correction method in a multicolor recording apparatus that is equipped with at least one recording head capable of sequentially recording in a predetermined area of a recording paper traveling in a predetermined direction in different colors, A sensor is provided for detecting the amount of deviation of the recording paper in the lateral direction with respect to the running direction, and the position of the information supplied to the recording head on the recording surface of the recording head is determined according to the detected amount of deviation. 1. A recording position correction method in a multicolor recording apparatus, characterized in that the recording paper is moved by moving the recording paper, thereby preventing color shift of information recorded on the predetermined area of the recording paper.