JPS6044374A - Printer - Google Patents

Abstract

PURPOSE:To print favorably without generating any feeling of incompatibility in the head arrangement, by a printer construction wherein a multiplicity of dot- forming elements driven in a partitioned manner and inclined in a staggered manner against a recording medium which is relatively moved. CONSTITUTION:The angle of inclination theta1 of LEDs is so set as to satisfy the relationship of the equation, wherein V1(mm./sec) is the linear velocity of a photosensitive material, t1 is the period of time required for sequentially driving the LEDs in a group, and L is the length of the LED. Where the head is used for a printer in which the linear velocity of the photosensitive material is V1, printing dots are arranged on a straight line. The dot-forming elements may be a PLZT photo shutter array or a liquid-crystal shutter array in a photo shutter array printer, or a thermal head array in a thermal printer. Accordingly, it is possible to print favorably, without changing the head, even when the linear velocity of the recording medium such as a photosensitive material is varied.

Description

Detailed Description of the Invention Technical Field The present invention relates to self-luminous printers using LED arrays, fluorescent I-arrays, etc., and optical shutters using PLZT, liquid crystal shutter arrays, etc. The present invention relates to printers such as array photo printers, thermal transfer printers, etc. using a thermal head array.

Conventional technology Conventionally, in this type of printer, for example, a printer using an LED array, for the purpose of reducing the number of wiring lines and suppressing the amount of heat generated, these LEDs are arranged in M groups of N 15EDs. A split driving method is adopted.

This forms dots on the photoconductor, but the photoconductor is moving at a linear speed, and if the LED array is linear, the printed dot row will be slanted. . In order to correct the linear velocity of such a photoreceptor, LE
The arrangement of D is a tilt 1 arrangement as shown in FIG. In the figure, (1,1),..., (+, N)
.

(2, 1,), etc. indicate the element number of the LED, and for example, (L, l) is the number 1th+ of one group. The arrows indicate the driving order direction of LIE D, (1,'1), (2,1), -, (lvl,1
) adopts a split drive method in which both are driven at the same time. If the photoreceptor moves at a predetermined linear velocity as a result of such an arrangement of LEDs and the power type for the division 19, the printed dot arrangement will be a straight line as shown in Fig. 2(a). .

However, the linear velocity of the same LED array head is 2 (V 2
> V 1 , ) or V3 (V 3 <V t ), when used in a gradient manner, the printed characters are arranged in a 1-to-1~ arrangement as shown in Figures (b) and (c), creating a step difference, and 1~ This results in an unnatural feeling in the TS I arrangement, and the print quality deteriorates. Therefore, if the photoreceptor has a different line speed (printing speed), it will be necessary to change to a dedicated head whose LED array inclination angle is set according to the speed.

The LI-like present invention has been developed in view of these points, and it is possible to prevent the occurrence of discomfort in the print arrangement without changing the head even if the linear velocity of a recording medium such as a photoreceptor changes. The aim is to obtain a printer that can print without any problems.

4. Construction An embodiment of the present invention is shown in FIGS. 3 to 5. (This will be explained next. In this embodiment, as a driver 1-forming element, L E
This is an application example to a printer using D, and ■Group N
M groups of LEDs (therefore, the total number of LEDs is MXN) are prepared and arranged as shown in FIG.

That is, each group is arranged in a diagonal manner, but the arrangement direction is arranged in a zitzag pattern so that the directions are alternately different. In this figure as well, (1, 1) etc. indicate the rear numbers of the elements, which are driven separately, but the driving order direction is in the direction of the inclination as shown by the arrow shown along the inclination. It is set differently depending on J.

Therefore, for example, for the l croup, (1, 1) → (1
, N), and for two groups, (2, 1
) → (2, N). Also, for example, (1,
1), (2,1), -, (M, ]) will be driven simultaneously. The inclination angle 01 of the LED is such that the linear velocity of the photoreceptor is V l (+no/5ee), and the distance 111' required to sequentially drive the LEDs in one group is t.
1 (see), the length of one group of LEDs is 1,
(IIMII), then 01 =Lan-' (V+
l 1/I-).

Therefore, if such a head is used in a printer where the linear velocity of the photoreceptor is vl, the print array from 1 to 4 will be
It becomes a straight line as shown in Figure (a). On the other hand, when the same head is used in a printer where the linear speed of the photoreceptor is 2, the printed 1-dot arrangement becomes as shown in FIG. 2(b). This one
The tilt angle 02 of the head array is &2 = L, an-” IV
I Lx -V2 tz 1/L, which is 01) 02, and there is no discontinuous point, and 1 hex 1 at photoreceptor 2.
- There is no discomfort in the arrangement and there is no loss of print quality.

In other words, even if the linear speed (printing speed) of the photoreceptor is different,
This means that the same spatula l' can be used without any problems.

FIG. 5 shows a concrete implementation example, in which 1 indicates the main body of the spatula 1, 2 indicates a light emitting section, and 3 indicates alternately arranged electrode sections. The wiring for taking out the light emitting part 2 and the electrode part 3 is all performed using the F-1 segography technique, so in order to give the light emitting part etc. an inclination angle, the inclination angle is set in the pattern of the F-1 mask. It's good to have one.

Note that in this example, a 1rL ED was used, but in an optical shutter array printer, a 1rL ED was used.
It goes without saying that it can be similarly applied to a ZT optical shutter array, a single crystal shutter array, a thermal printer, a thermal spatula 1 to an array, etc., and providing such an inclined arrangement poses no technical problem.

Effects Since the present invention is configured as described above, even if the linear velocity of a recording medium such as a photoconductor changes, it is possible to print with good quality without changing the head without causing any discomfort in the head arrangement. It is something that can be done.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the conventional arrangement, Figure 2 (,1) to (
c) is a plan view showing the arrangement of the printing driver 1; FIG. 3 is a plan view showing an embodiment of the present invention; FIGS.
1 is a plan view showing the printed character arrangement, and No. 1 is a plan view showing an embodiment. Applicant Rico Co., Ltd. −

Claims (1)

[Scope of Claims] 1. A printer characterized in that a large number of dot forming elements are arranged in a zigzag manner in a zigzag manner to inscribe a relatively moving recording medium and to drive the dots in a divided manner. 2. The printer according to claim 1, wherein the direction in which the dot forming elements are driven is changed depending on the direction of inclination thereof.