JP3432062B2 - Ink jet recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an ink jet recording apparatus for ejecting ink toward a recording medium and forming and recording an image. 2. Description of the Related Art Computers, word processors, facsimile machines, copiers, printers, etc.
As means for performing recording on a recording medium such as paper, an ink jet recording apparatus is being widely used because high-speed recording is possible without generating noise. A recording head provided in an ink jet recording apparatus discharges ink from a position facing the recording medium by inputting a signal current from the ink jet recording apparatus to record characters and image images on the recording medium (hereinafter referred to as printing). ). [0004] Conventionally, with regard to a sheet as a recording medium used in an ink jet recording apparatus, an optimum image quality has been obtained with a specific sheet. [0005] However, there are many types of paper used in the ink jet recording apparatus, and it is impossible to obtain an optimum image in accordance with all the paper characteristics. there were. The present invention has been made to solve the above-mentioned conventional problems, and provides an ink jet recording apparatus capable of easily setting an ink ejection amount from a recording head in accordance with the characteristics of a recording medium. It is intended for. In order to achieve the above object, according to the present invention, an ink jet recording apparatus is provided with the following (1).
It is configured as follows. (1) Signal processing means for converting print data into a print signal, a recording head for receiving the print signal and discharging recording ink, transport means for transporting a recording medium, and control for controlling the above means Means for ejecting ink from the recording head to form an image on a recording medium, the control means comprising: detecting means for detecting a state of a print image; and data of a specific print image. Print image memory for storing the ink ejection amount setting for setting the ink ejection amount to be ejected from the recording head
Means and an image of 100% black pixels,
Change the ink ejection amount by changing the set value by the setting means
Is not recorded and the state of the image by the print detected from said detecting means, the ink ejection amount on the basis of the detection result
Calculating a logical voltage at each ink ejection amount to be detected by the detection means when the recording of the 50% black pixel is performed by using the ink ejection amount setting means.
Setting value detected by said detecting means actual voltage at each ink ejection amount in the case of actual recorded by changing the amount of ink ejection by changing the by, i between the actual voltage and the logic voltage
Based on the blur state of the image obtained by the comparison of ink injection amount per, and control means for controlling so as to set the injection amount of ink to the ink jet setting means, the purine
Print data held in the image memory,
Head drive that performs recording based on the setting by the amount setting means.
An ink jet recording apparatus comprising a moving part . [0008] In order to achieve the above object, the present invention has a print image detecting means and an ink jet setting means, and after printing a specific image, by outputting from the print image detecting means.
It has a function of determining an optimal ejection amount by the optimal image ink ejection setting means. An embodiment of the present invention is a signal processing means for converting print data into a print signal, a print head for inputting the print signal and discharging ink for printing, and a print medium. An ink jet recording apparatus that has a transport unit and a control unit that controls each of the units, and discharges ink from the recording head to form an image on a recording medium. The inkjet recording apparatus is characterized by a control function of the control unit. ing. Hereinafter, with reference to the accompanying drawings, a description will be given of a characteristic configuration, operation and effects of the embodiment. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. 1 is a signal line for receiving print data;
2 is a CPU, 3 is an ink ejection amount setting mode switch, 4
Is a CG-ROM for generating a character dot pattern corresponding to a character code, 5 is an image ROM for generating an image dot pattern of 50% black pixels, 6 is a memory for storing a print image, 7 is an inkjet head driving unit, and 8 is A reflection type light receiving unit for detecting a state of a printing surface, an ink ejection amount setting register 9 for setting an ink ejection amount from an ink jet driving unit, and a paper feed unit 10 are shown. FIG. 2 is an explanatory diagram showing an ink ejection amount setting register value and an ink ejection amount ratio for one dot. FIG. 3 is an explanatory diagram showing the relationship between the output voltage of the reflection type light receiving section 8 shown in FIG. 1 and the number of black pixels on the printing surface. FIG. 4 is an explanatory diagram showing an image dot pattern of 50% of black pixels. In FIG. 1, when the ink ejection amount setting mode switch 3 is off, the printer operates as a normal printer,
The CPU 2 receives the print data from the signal line 1 and converts the dot pattern of the character corresponding to the character code into a CG-ROM.
4 and expanded in the print image memory 6. When one page of print data has been stored in the print image memory 6, the paper feed unit 10 feeds paper, and the inkjet head drive unit 7 ejects ink according to the register value of the ink ejection amount setting register 9. To print the contents of the print image memory 6. Next, the operation of the embodiment of the present invention when the ink ejection amount setting mode switch 3 is turned on will be described. [0018] First perform paper feed, and V _W which indicates the output of the state of the paper at that time from the reflection type light receiving portion 8 in FIG. Next, the image of the 100% black pixel is printed by changing the value of the ink ejection amount setting register 9 from 0 to 3, and the output from the reflection type light receiving unit 8 to the value of 0 to 3 of the ink ejection amount setting register 9 is shown. and V0, V1, V2, V3 shown in 3, the logic voltage of 50% black pixels in the value of the ink injection amount setting register 9 from 0 to _{3 (V W -V 0) /} 2, (V W -V 1 ) / 2
_{(V W -V 2) / 2} , as _{(V W -V 3) / 2} , the obtained value V0 ', V1', V2 ' , V3' and. Thereafter, the value of the ink ejection amount setting register 9 is changed from 0 to 3, and an image of 50% black pixels shown in FIG. 4 is printed, and the output from the reflection type light receiving section 8 at that time is shown in FIG.
V0 ", V1", V2 ", and V3" shown in FIG. Then, V0 ', V1', V2 ', V3' corresponding to the value of the ink ejection amount setting register 9 obtained previously.
If Vn ″ <Vn ′, it is determined that the ink ejection amount is not absorbed by the paper and the print image is blurred, and the value of the ink ejection amount setting register 9 is determined. The set ink jet amount setting mode is determined by the value of the setting register 9. As described above, according to the present invention, according to the present invention,
By setting the ink ejection amount in accordance with the characteristics of the paper used as the recording medium, various recording media can be used, and an optimal image can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. FIG. 2 is an explanatory diagram showing an ink ejection amount setting register value and an ink ejection amount ratio per dot. FIG. 3 is an explanatory diagram illustrating a relationship between an output voltage from a reflective light receiving unit and the number of black pixels on a printing surface. FIG. 4 is an explanatory diagram of a 50% black pixel dot pattern. [Description of Signs] 1 signal line 2 CPU 3 ink ejection amount setting mode switch 4 CG-ROM 5 for generating character dot pattern 5 image ROM for generating 50% black pixel dot pattern 6 print image memory 7 ink jet head drive unit 8 reflection Type light receiving unit 9 Ink ejection amount setting register 10 Paper feed unit

Claims (1)

(57) Claims 1. A signal processing means for converting print data into a print signal, a print head for receiving the print signal and discharging printing ink, and transporting a print medium. Transport means;
An ink jet recording apparatus comprising: a control unit that controls each of the units; and an ink jet recording apparatus that discharges ink from the recording head to form an image on a recording medium, wherein the control unit detects a state of a print image; , in which to set the print image memory for storing data for a specific print image, the ink ejection amount to be ejected from the recording head
And click injection amount setting means, an image of 100% black pixels, the ink injection amount setting means
By changing the set value by changing the ink ejection amount
Record , the state of the image by this printing is detected from the detection means, and based on the detection result , 50%
Calculates the logical voltage of each ink ejection quantity to be detected by said detecting means when performing recording of black pixels, 50%
Setting the image of the black pixel by the ink ejection amount setting means
The actual voltage of each ink ejection amount when <br/> it by a real recorded by changing the amount of ink ejection by changing the value detected by said detecting means, the ink ejection amount and the actual voltage and the logic voltage
Control means for controlling the ink ejection setting means to set an ink ejection amount based on a blur state of an image obtained by each comparison , and print data held in the print image memory
And recording based on the setting by the injection amount setting means.
An ink jet recording apparatus characterized by comprising a head driving unit that performs.