JPS58217378A - Recording device - Google Patents

Abstract

PURPOSE:To obtain a recording density varying type recording device by which excellent recording operation can be performed in correspondence with uses and wherein the light emitting timing of an LED and the amount of movement of an optical writing head in the secondary scanning direction are controlled in correspondence with moving inclination of an LED array, respectively. CONSTITUTION:An LED array 9 is provided so that it is freely moved and positioned with the optical axis of an image forming lens 10 in an image forming optical system as a center. In correspondence with the moving inclination, the light emitting timing of the LED and the amount of movement of an optical writing head 4 in the secondary scanning direction are controlled by varying means, respectively. The constitution is simplified without the effect on the image forming optical system and multiple stage high density can be readily obtained. At the time of graphic recording, high density recording can be performed; and at the time of character recording, high speed recording can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device such as a printer or a facsimile.

Generally, in the case of graphic recording in a recording device,
If the recording density is improved, high image quality can be obtained, but the recording speed will be reduced. On the other hand, in the case of character recording based on a character generator, there is no problem as long as the recording density is at a certain level. Problems arise with the character generator's storage capacity and slow recording speed. However, in the conventional variable recording density type, recording corresponding to graphic recording, character recording, etc. cannot be performed satisfactorily, and the apparatus becomes complicated and the recording speed decreases.

The present invention has been made in view of the above points, and has a cylindrical structure that enables high-density recording during graphic recording.
The object of the present invention is to provide a variable recording density type recording device that can perform a good recording operation depending on the application, such as high-speed recording.

The present invention provides an LBDID array that is rotatable and positionable about the optical axis of the imaging optical system, and when high-density recording is required, the LED ID array can be moved to tilt the alignment position. , the light emission timing of the LED and the amount of movement in the sub-scanning direction of the optical writing head are variably controlled in accordance with the inclination, making it possible to easily perform high-density recording without affecting the imaging optical system, and when recording characters. etc., the configuration is such that high-speed recording is possible by restoring the original state.

An embodiment of the present invention will be described based on the drawings.

First, the basic structure and operation of the recording apparatus in this embodiment will be explained with reference to FIGS. 1 and 2. Servomotor(
1) A drum-shaped photoreceptor (2) that rotates in the direction of the arrow
The area around K is the corona charger (3) according to the electronic balance process.
, an optical writing head (4), a transfer device (5), a transfer corona charger (6), a static eliminator (7), and a cleaning device (8).
) are arranged in order. Here, the optical writing head (4)
is an LED array (9) consisting of n LEDs arranged in a row.
and an imaging lens θO as an imaging optical system that receives the light emitted from T and ED and forms an image on the photoreceptor (2).1. Parallel guide axis α1 along the axial direction of the photoreceptor (2)
) (12) and moves by a suitable amount in the sub-scanning direction (axial direction of the photoreceptor (2)) by the motor (14) via the wire (1:1). A paper feed roller α and a registration roller Q are provided to feed the recording paper αG stored in the cassette (2) toward the transfer position. A fixing device (1) is provided between the registration rollers 08 and the paper output tray (to). A gripper chain (with a support for conveying the recording paper αQ) is provided.

Furthermore, a rotary encoder (c) is attached on the axis of the photoreceptor (2).

In such a configuration, first, in order to uniformly charge the surface of the photoreceptor (2) with the corona charger (3), the current charger (
The photoreceptor (2) is rotated once while holding other members such as 5) in a non-operating state. Then, the rotational speed of the photoreceptor (2) is increased to a predetermined speed by the servo motor (1)K.

Then, a necessary one among the n LEDs in the LED array (9) is caused to emit light according to the image information, and an image is formed on the photoreceptor (2) by the imaging lens QO to form a latent image.

At this time, the main scanning direction (rotation direction of photoreceptor (2)) LD
The LED light emission timing is determined by the rotary encoder (c) K.
It is controlled by a pulse signal generated by here,
If the recording width in the axial direction of the photoreceptor (2) created by lighting n LEDs is 1ILx, then the recording density in the axial direction of the photoreceptor (2) N it, N = n/l (dots
, 4m).

Next, after - rotation of the photoreceptor (2), the motor α4I/c moves the optical writing head (4) by a recording width l in the axial direction of the photoreceptor, and performs the same recording operation. By repeating K, a latent image is formed on the entire surface of the photoreceptor (2). Thereafter, the rotational speed of the photoreceptor (2) is reduced to a predetermined speed, the image is visualized by the photoreceptor (5), and is transferred onto the recording paper 0Q at the transfer position. This transferred transfer paper α0
The paper passes through the fixing device and is ejected to the paper ejection tray α. On the other hand, the toner remaining on the photoreceptor (2) is removed by the static eliminator (7) K.
After the static electricity is removed by the cleaning device (8), the cleaning device (8) cleans and recovers the static electricity.

The principle of the variable recording density system of this embodiment is shown in FIGS. 3 and 4. First, Figure 3(a) shows the basic state, IJD (L+) (Ll)...Song (
Ln ) are lined up in a row along the sub-scanning direction, and the imaging lens α (l from l in the sub-scanning direction 1'c F!1 ""'
A latent image with a recording width to is formed. The recording density NO in this case is NO=n/lo. Also,
The dot diameter at this time is K do as shown in Fig. 4(a).
shall be. Therefore, the optical writing head (4) moves K in the sub-scanning direction K jo MO times.

Next, in order to increase the recording density, the LBD array (9) is rotated by an angle θ1 around the optical axis φ of #my lenses 01 and fixed as shown in FIG. 3C). Since this is K, the imaging position of the latent image B1-Bn is also tilted by an angle θ1 with respect to the sub-scanning direction, and the recording width I! as seen in the sub-scanning direction. 1 is l! 1=to
cos θ1 < 10, and n latent images I'll to Fjn can be lined up in this recording width/1, so the recording density N1
is densified as N1=n/zl>No. However, the light emission timing of each IJD (Ll) to (Ln) is controlled by the light emission timing variable means. That is,
The position of the latent image E1 + EyH on the photoreceptor (2) is at an angle of θ
2w = 10 sin em from IK photoconductor (2)
, so each LED (Ll) to (Ln)
do not emit light at the same time as in the case of Fig. 3(a), but emit light sequentially from the LED (Ll) to the LID (Ln) based on the relationship between the 0 weight inclination and the rotational speed of the photoreceptor (2). As a result, the latent f#s E1 to En are aligned in the sub-scanning direction as shown in FIG. 4(6). Further, the LED light emission timing in the main scanning direction is controlled based on the pulse signal generated by the rotary encoder (c) with LID (Ll) as a reference. When one main scan is completed in this way, the recording width is 11, so the motor o4 is controlled so that the amount of movement of the optical writing head (4) in the sub-scanning direction is /1. This will be repeated M1 times.

Therefore, in comparison with Fig. 3 (a>), each LBD
(Ll) ~ (Ln) The signal given by K is also shown in Fig. 3 (
In a), - is the image information obtained by decomposing the length 10 into n pixels, while in FIG. 3 (J), it is the image information obtained by decomposing the length 21 into n pixels. In addition, in this embodiment, when increasing the recording density, each TJD (Ll) to (L
The amount of LED light emitted can be changed by controlling the LED current, light emitting time, etc. in n), and the dot diameter can be changed to d as shown in Figure 4 (a).
Since l < do, the image is of high quality.

FIG. 3(C) and FIG. 4(G) show cases where the density is further increased, and the principle is the same as the case of FIG. 3<4) and FIG. 4(4).

Incidentally, the recording density in the main scanning direction can be improved more easily than in K by varying the interval between the pulses generated by the rotary encoder (C).

Therefore, in the case of character recording, etc. that does not require higher density than necessary, the recording operation as shown in FIGS. 1 and 2 should be performed under the basic state shown in FIG. 3(a) K. If this is the case, high-speed recording will be possible. Also, when recording graphics, etc., the LED ID array) shown in Figure 3 (
4) High-density and high-quality images can be obtained by variably controlling the light emission timing and the amount of movement to perform the recording operation under the condition of rotation by a predetermined angle as shown in (G). At this time, L
Since the BD array (9) rotates around the optical axis φ of the lens αQ, even if the rotation is varied in multiple stages, the lens αO
It will be K if it is not affected in any way and can be done with a simple configuration.

Also, in character recording, LE is shown in Figure 3 (-).
If the same information as that given to the DID array (DID array) is given to the LED array (9)K in a variable form such as (G) in Fig. 3, and the light emission timing is sequentially shifted, the result shown in Fig. 3 (a) is obtained.
It is also possible to perform reduced recording with respect to standard recording using this method.

The means for rotating and positioning the LED ID array is embodied as shown in FIGS. 5 and 6.

First, on the top of the optical writing head (4) is an LID array (9).
) and a disk-shaped IJDID array substrate (C) equipped with cooling fins (C) is rotatably provided.
There are multiple positioning parts (EDID array board) on the circumference of the
27a) (274) (27c) (27d) are formed in the shape of a notch.

Further, a part of the optical writing head (4) has the positioning section (
27a) (274) (27c) (27d) K has a locking/disengaging roller at one end, is rotatable around the pin holder, and is biased in the locking direction (clockwise when viewed from above) by the spring OIK. A positioning lever OXl with the abbreviated character OXl is provided.

Further, on the opposite side, there is provided a substantially U-shaped positioning sensor 0 for detecting the rotational position of the LED ID array board.

On the other hand, when the optical writing head (4) is located at the home position as shown in FIG. It is rotatably provided.

This drive pulley 03 is set to be pressed against and driven by a drive pulley (2) that rotates in forward and backward directions via a motor (to) supported by a fixed plate (to), a motor pulley zero force, and a drive belt (to). ing. Here, the drive lever (B) formed in a 5-shape is rotatable around the shaft (■) of the drive pulley (2), and is biased clockwise (as seen from above) by a spring @9, while one end on the right side is connected to solenoid action. Also,
The other end is provided with a pin (41) that can regulate the positioning lever G cuff.

This is K, the positioning part of the IJtD array board (c) (
27a) (274) (27e) (27j), and when it is necessary to change the rotation of the LED ID array, the optical writing head ( 4) is performed when position is located at the home position. First, the solenoid) is turned on and the drive lever (b) is turned on.
is attracted and rotates counterclockwise, the other end pin presses the positioning lever G force, and the positioning lever 0 force is rotated counterclockwise against spring (1) K, so the roller (H) ) is removed from the positioning part (goods) that was locked, and the LED
ID array board) becomes free. On the other hand, since the motor @ also rotates based on the variable recording density signal, the LED array board (c) is rotated in the required direction via the drive pulley (2) 01 and the like. When a predetermined amount of rotation is detected by the positioning sensor 02, the motor (2) stops, the solenoid (6) is also turned off, the drive lever (B) returns to its original position, and the bottle sakaki is turned off. Since the force of the positioning lever G is no longer regulated, the rollers (c) of the positioning lever G are engaged with the opposing positioning portions (2), and the LED array board (c) and therefore the LED array (9) are locked. In this way, LBD array (9)
With the rotation position determined, the recording operation begins as shown in FIG.

Note that the rotation and positioning means for the IJD array (9) is the fifth
Without being limited to FIGS. 6 and 6, for example, a motor for rotating and positioning the optical writing head (4) and the integrated LED array (9) may be mounted on a tower to perform the operation at any position in the sub-scanning direction. You can also configure K.

As described above, the present invention provides a K LED array that is rotatable and positionable around the optical axis of an imaging optical system, and adjusts the light emission timing of the LED and the sub-position of the optical writing head according to the rotational inclination of the K LED array. Since the amount of movement in the scanning direction is controlled by each variable means, there is no effect on the imaging optical system, and the structure is simple and high-density multi-stage can be easily achieved, making it suitable for recording purposes such as character recording and graphic recording. Records can be made appropriately depending on the situation.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a side view showing its basic configuration, FIG. 2 is a perspective view of a part thereof, and FIG.
Figures (a) to (c) are explanatory diagrams showing the principle, and Figures 4 (a) to
(C) is an explanatory diagram showing a dot state, and FIGS. 5 and 6 are perspective views. 2... Photoreceptor, 4... Optical writing head, 9... LF
XD array, 10...imaging lens (imaging optical system), 1
4...Motor (movement variable means) Applicant Ricoh Co., Ltd.

Claims (1)

[Claims] In a recording device that scans an optical writing head equipped with an LED ID array imaging optical system in which a plurality of LEDs are arranged in a line and explodes onto a photoreceptor, the imaging position is centered on the optical axis of the imaging optical system. The LED ID array is provided so as to be rotatable and positionable around the optical axis of the LED ID array so as to be tilted in the same direction, and a light emission timing variable means is provided to vary the light emission timing of each LED of the LID array in accordance with the inclination. A recording apparatus characterized by being provided with a movement amount variable means for changing the movement amount of the head in the sub-scanning direction in accordance with the LED ID array.