JP2002127583A - Method of forming printing pattern of liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of forming printing patterns of a liquid crystal display element wherein the printing patterns of a plurality of colors are formed in a short time on the front of the element and which enables reduction of the manufacturing cost of the element and also formation of the printing patterns of excellent quality. SOLUTION: The printing patterns of colors in a plurality are printed in sequence consecutively on the front of the liquid crystal display element by transfer printing with quick drying ink of the individual colors, and then the ink being printed is dried collectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method for forming a plurality of color print patterns on the surface of a liquid crystal display device.

[0002]

2. Description of the Related Art For example, various marks and decorative patterns provided on a front surface (display observation surface) or a rear surface of a liquid crystal display element mounted on an electronic timepiece or a calculator are formed by transfer printing.

In the transfer printing, ink is supplied into the ink receiving recess of a printing plate having an ink receiving recess formed in a shape corresponding to a predetermined print pattern, and the ink in the ink receiver is covered by a transfer member. The transfer printing is performed on the printing surface of the printed matter. According to the transfer printing, printing on the liquid crystal display element can be performed at a low cost without applying excessive force to the liquid crystal display element.

However, in the transfer printing, the number of ink colors that can be printed in one printing is one.

Therefore, when forming a plurality of color print patterns on the front surface of a liquid crystal display element, conventionally, first, a print pattern of one color of the plurality of color print patterns is transferred and printed with ink of the color. And drying by an oven, and thereafter, a process of printing a printing pattern of the next color by transfer printing of the ink of the color and drying by an oven is repeated to form a printing pattern of a plurality of colors. .

[0006]

However, as in the above-described conventional print pattern forming method, it is difficult to form a print pattern of a plurality of colors by alternately repeating transfer printing and drying of one color ink. Since it takes a long time to complete the formation of print patterns of all colors, the manufacturing cost of the liquid crystal display element increases.

According to the present invention, a print pattern of a plurality of colors is formed on the front surface of a liquid crystal display element in a short time, thereby reducing the manufacturing cost of the liquid crystal display element and forming a print pattern of good quality. It is an object of the present invention to provide a method for forming a print pattern of a liquid crystal display element.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a plurality of color printing patterns are sequentially and continuously printed on the surface of a liquid crystal display element by transfer printing of quick drying inks of the respective colors.
Thereafter, the printed quick drying inks of a plurality of colors are collectively dried.

In this printing pattern forming method, transfer printing of a plurality of color printing patterns on the surface of a liquid crystal display element is sequentially and continuously performed, and thereafter, the printed plurality of color inks are collectively dried. Therefore, even if the number of colors of the print pattern is plural, the printed ink only needs to be dried once, so that a print pattern of a plurality of colors can be formed in a short time and the manufacturing cost of the liquid crystal display element can be reduced. can do.

In addition, this printing pattern forming method prints the printing patterns of the plurality of colors by transfer printing of quick-drying ink, and the quick-drying ink is applied to such an extent that it does not adhere to other objects immediately after printing. Even if the transfer printing of a plurality of color printing patterns is performed successively and continuously, the ink printed on the surface of the liquid crystal display element does not adhere to the transfer member during the transfer printing of the next color ink. Therefore, it is possible to form a print pattern of good quality with no chipping or fading.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a printing pattern forming apparatus for forming a plurality of printing patterns on the front surface of a liquid crystal display element, and FIG. 2 is a side view of a transfer printing machine constituting the printing pattern forming apparatus.

In this embodiment, a print pattern of three colors is formed on the front surface of the liquid crystal display element 1. The printing pattern forming apparatus shown in FIG. The apparatus includes a conveyor 10, three transfer printing machines 11, and one ink drying oven 17.

The three transfer printing machines 11 are arranged side by side in the conveying direction of the liquid crystal display element 1 in a printing area for printing on the front surface of the liquid crystal display element 1 intermittently conveyed by the conveyor 10. And the oven 17
Are arranged on the carry-out side of the printing area.

The three transfer printing machines 11 have the same structure, and as shown in FIGS. 1 and 2, an ink receiving recess 13 having a shape corresponding to a predetermined printing pattern is formed at one end of the upper surface. Plate 12, and an ink supply cup 1 for supplying ink into the ink receiving recess 13 of the plate 12.
4, a transfer member 15 for transferring the ink supplied into the ink receiving recess 13 of the plate 12 to the front surface of the liquid crystal display element 1 on the conveyor 10, and an elevating mechanism 16 for the transfer member 15. I have.

The printing plate 12 is provided horizontally at a height approximately halfway between the highest position of the transfer member 15 and the liquid crystal display element 1 on the conveyor 10, and is provided by a printing plate moving mechanism (not shown). The ink receiving recess forming portion on one end side is moved forward and backward to a transfer position in which the space below the transfer member 15 enters, and a home position in which the entire printing plate retreats to the side of the transfer member 15.

The ink supply cup 14 is a thin container having an ink chamber opened on the lower surface (the surface in contact with the plate 12), and the edge of the peripheral wall of the ink chamber has a knife edge over the entire circumference. It is formed in a shape.

The ink supply cup 14 is arranged corresponding to the position of the ink receiving concave portion when the printing plate 12 is moved backward to the home position in a state where the ink a is stored in the ink chamber. The front edge of the peripheral wall of the ink chamber is supported by a cup support (not shown) in a state in which the leading edge of the peripheral wall of the ink chamber is in close contact with the upper surface of the printing plate 12. Slide.

The transfer printing machine 11 supplies the ink a in the ink supply cup 14 into the ink receiving recess 13 on the upper surface of the printing plate 12, and supplies the supply ink into the ink receiving recess 13 to the transfer member 15. Is transferred to the front surface of the liquid crystal display element 1 on the conveyor 10, and before the start of transfer printing, the printing plate 12 is in a state of being moved backward to the home position as shown by a solid line in FIG. The ink supply cup 14 is located on the ink receiving recess forming portion of the plate 12. Further, the transfer member 15
As shown in FIG. 2, it is raised to the highest position.

The transfer printing by the transfer printing machine 11 is performed in the following procedure.

First, the printing plate 12 is moved forward from the home position toward the transfer position. When the printing plate 12 is moved forward in this manner, the ink a in the ink supply cup 14 is supplied into the ink receiving recess 13 of the printing plate 12, and the ink a on the upper surface other than the ink receiving recess 12 of the printing plate 12 is supplied. Are collected by the leading edge of the peripheral wall of the ink chamber of the ink supply cup 14 and are collected by the ink supply cup 14.
Collected inside.

The plate 12 supplied with the ink a in the ink receiving recess 13 is moved forward to a transfer position as shown by a chain line in FIG. Stopped in the space of.

Next, the transfer member 15 is lowered and its lower surface is pressed against the upper surface of the plate 12, and the ink in the ink receiving recess 12 of the plate 12 is attached to the lower surface of the transfer member 15.

Next, the transfer member 15 is pulled up to the highest position, and the printing plate 12 is retracted to the home position.
Thereafter, the transfer member 15 is lowered again, and the lower surface of the transfer member 15 is pressed against the front surface of the liquid crystal display element 1 as a printing object, so that the ink a on the lower surface of the transfer member 15 is applied to the front surface of the liquid crystal display element 1. Transcribe.

Next, the method of forming a print pattern on the liquid crystal display element 1 by the above-described print pattern forming apparatus will be described in connection with the case where three color print patterns of, for example, black, red and blue are formed on the front surface of the liquid crystal display element 1. An example will be described.

When forming the three color printing patterns of black, red, and blue, the black ink is supplied into the ink supply cup 14 of the first transfer printing machine 11 among the three transfer printing machines 11. , One of the three colors of red and blue, for example, a black quick-drying ink a1 is accommodated in the ink supply cup 14 of the second transfer printing machine 11, and another one of the colors, for example, a red quick-drying ink The ink a2 is stored, and another one color, for example, blue quick-drying ink a3 is stored in the ink supply cup 14 of the third transfer printing machine 11.

On the other hand, each time the liquid crystal display element 1 comes to a position corresponding to each transfer printing machine 11, the transfer member 15 is moved by the conveyer 10 in a state where the front surface which is the printing surface faces upward.
It is intermittently conveyed at the timing when it stops under.

Then, the first transfer printing machine 11 waits for the liquid crystal display element 1 to be transported to a position corresponding to the transfer printing machine 11 and stops, and then, on the front surface of the liquid crystal display element 1, The black quick-drying ink a1 is transferred and printed.

In the second transfer printing press 11, the liquid crystal display element 1 on which the black quick-drying ink a1 is printed is conveyed to a position corresponding to the second transfer printing press 11, and stopped. Then, the red quick-drying ink a2 is transferred and printed on the front surface of the liquid crystal display element 1.

Further, the third transfer printing machine 11 is provided with the black quick-drying ink a1 and the red quick-drying ink a2.
Is transferred to a position corresponding to the third transfer printing machine 11 and stopped.
On the front surface of the liquid crystal display element 1, a blue quick-drying ink a3
Is transferred and printed.

The above three quick-drying inks of black, red and blue a
The liquid crystal display element 1 on which 1, a2, and a3 are printed is passed through the oven 17 while being intermittently conveyed by the conveyor 10, during which the black printed on the liquid crystal display element 1,
The red and blue quick-drying inks a1, a2 and a3 are collectively dried.

Then, the three colors of black, red and blue are transferred by transfer printing of the three quick drying inks a1, a2 and a3 of black, red and blue and then collectively drying the quick drying inks a1, a2 and a3. The liquid crystal display element 1 on which the print pattern is formed is conveyed by the conveyor 10 to a next process line such as a quality inspection line. The formation of a print pattern on the liquid crystal display element 1 by the above-described print pattern forming apparatus can be performed continuously by intermittently transporting the plurality of liquid crystal display elements 1 one after another by the conveyor 10.

In the printing pattern forming method, transfer printing of three color printing patterns of black, red, and blue on the front surface of the liquid crystal display element 1 is sequentially performed, and thereafter, a plurality of printed inks of a plurality of colors are printed. Since a1, a2, and a3 are collectively dried, the printed inks a1, a2, and a3 need only be dried once even if the number of colors of the print pattern is plural, and therefore, printing of a plurality of colors is performed. Form a pattern in a short time,
The manufacturing cost of the liquid crystal display device can be reduced.

Moreover, the above-mentioned printing pattern forming method prints a plurality of printing patterns of a plurality of colors by transfer printing of quick-drying ink, and the quick-drying ink dries immediately after printing to such an extent that it does not adhere to other objects. Therefore, even if the transfer printing of the printing pattern of a plurality of colors is performed sequentially and continuously,
The ink printed on the front surface of the liquid crystal display element 1 does not adhere to the transfer member 15 of the transfer printing machine 11 that prints the next color ink during the transfer printing of the next color ink.

Therefore, the ink applied to the liquid crystal display element 1 adheres to the transfer member 15 during transfer printing of the ink of the next color and is carried away, and the print pattern can be chipped or the ink layer of the print pattern becomes thin. There is no loss, and therefore, it is possible to form a print pattern of good quality without any pattern chipping or color fading.

The liquid crystal display element 1 is completed by attaching polarizing plates to the front and rear surfaces of a liquid crystal cell in which a liquid crystal layer is provided between a pair of substrates. It may be formed on the front surface of the polarizing plate after attaching the polarizing plate to the front surface, or may be formed on the front surface of the liquid crystal cell before attaching the polarizing plate.

The above-described printing pattern forming method is not limited to the above-described printing patterns of three colors of black, red, and blue, and can be applied to formation of printing patterns of other plural colors.
Furthermore, a plurality of transfer printing machines 11 are provided in accordance with the number of colors of the print pattern formed on the front surface of the liquid crystal display element 1, and the transfer printing machines 11 perform transfer printing of fast drying inks of different colors, respectively. A print pattern of an arbitrary number of colors of two or more colors can be formed.

[0037]

According to the method for forming a print pattern of a liquid crystal display element of the present invention, a plurality of color print patterns are successively printed on the surface of the liquid crystal display element by transfer printing of quick drying inks of the respective colors. Thereafter, since the printed quick-drying inks of a plurality of colors are collectively dried, even if the number of colors of the print pattern is plural, the printed ink only needs to be dried once, Therefore, a print pattern of a plurality of colors can be formed in a short time, and the manufacturing cost of the liquid crystal display element can be reduced.

In addition, in this printing pattern forming method, the printing patterns of the plurality of colors are printed by transfer printing of quick-drying ink, and the quick-drying ink is applied to such an extent that it does not adhere to other objects immediately after printing. Even if transfer printing of a plurality of color printing patterns is performed successively and continuously, the ink printed on the front surface of the liquid crystal display element does not adhere to the transfer member during the transfer printing of the next color ink. Therefore, it is possible to form a print pattern of good quality with no chipping or fading.

[Brief description of the drawings]

FIG. 1 is a front view of a print pattern forming apparatus for forming a plurality of print patterns on a front surface of a liquid crystal display element according to an embodiment of the present invention.

FIG. 2 is a side view of a transfer printing machine of the printing pattern forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element 10 ... Conveyor 11 ... Transfer printing machine 12 ... Plate 13 ... Ink receiving recess 14 ... Ink supply cup 15 ... Transfer member 16 ... Elevating mechanism 17 ... Oven

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B41M 1/10 B41M 1/10 1/14 1/14 7/00 7/00

Claims (1)

[Claims] 1. A plurality of printing patterns of a plurality of colors are sequentially and continuously printed on the surface of a liquid crystal display element by transfer printing of the respective quick-drying inks of the respective colors. A method for forming a print pattern of a liquid crystal display element, comprising drying all at once.