JPS6127519A - Image recording device - Google Patents

Abstract

PURPOSE:To simplify the structure of an image recording device, and to manufacture it easily by placing a recording medium on a rotary table, moving linearly a reflecting mirror and a condensing lens in its diameter direction, scanning the recording medium surface, and forming an image. CONSTITUTION:A laser light from a laser oscillator 1 is made parallel by a collimator lens 2 and parallel lights 3 are formed. The laser lights which have passed through a modulator 4 are reflected by a plane reflecting mirror 13 and condensed by a condensing lens 7, and a spot is formed on a recording medium 8 installed onto a rotary table 14. The reflecting mirror 13 and the condensing lens 7 are installed in advance to a linear moving base 16, interlocked with a rotation of the rotary table 14, execute a linear movement by a motor 10 and a screw 11, and the condensed laser light scans spirally on the recording medium 8 by a rotation of the rotary table 14 and a movement of the linear moving base 16, and forms an image 12 on the recording medium 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image recording apparatus such as a facsimile, printer, plotter, etc., which exposes a photosensitive agent to laser light and records an image on a photosensitive surface of a film or the like.

Conventional configuration and its problems A conventional image recording device will be described below.

An example of a conventional image recording device is shown in FIG. 1 is a laser oscillator which is a light source, and 2 is a collimator lens for making laser light into uniform parallel light. The laser beam 3, which has been made into parallel light by the collimator lens 2, enters the modulator 4 and is modulated according to input from a document reader or computer (not shown).

The laser beam that has passed through the modulator 4 is reflected by a rotating mirror 6 that rotates around a rotation axis 5, and scans in a direction perpendicular to the rotation axis 5. 7 is a condensing lens, and the laser beam is condensed by the condensing lens 7 and focused on a target position.

8 is a recording medium, such as a film coated with an emulsion that is exposed to laser light. The recording medium 8 is mounted on a linear moving table 9. The linear moving table 9 is the motor 1
Movement is effected by screw 11. The rotating mirror 6 performs high-speed scanning (main scanning) in a direction perpendicular to the moving direction of the linear moving table 9, and the linear moving table 9 performs low-speed scanning (sub-scanning). By scanning in the above biaxial directions, the entire surface of the medium is scanned by the laser beam,
An image 12 is recorded on the media.

In such a conventional example, since the laser beam is reflected by the rotating mirror 〇, the angular accuracy of each reflecting surface of the rotating mirror 6 is very important, and if there is an angular error, the image will not be formed. There is a drawback that the lines are disturbed, and in order to correct this drawback, it is necessary to manufacture the rotating mirror 6 with extremely high precision, resulting in the drawback that the device as a whole becomes expensive.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks and to realize an image recording device that has a simple structure and is easy to manufacture.

Structure of the Invention The present invention achieves the above object, and includes a reflecting mirror that reflects a beam from a light source, a condensing lens that focuses the beam reflected by the reflecting mirror onto a recording medium, and a condensing lens that focuses the beam reflected by the reflecting mirror onto a recording medium. The present invention provides an image recording device characterized by comprising a rotary table on which it is placed and rotated, and means for linearly moving the reflecting mirror and the condensing lens in the radial direction of the rotary table.

,7 Description of examples Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an overview of an image recording apparatus according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a laser oscillator, which uses an argon laser with a wavelength of 488°. 2 is a collimator lens, and the laser beam from the laser oscillator 1 is collimated by the collimator lens.
．． 14@haze parallel laser beam 3 was formed. Reference numeral 4 denotes a modulator, which receives modulation from an input from a document reader or computer (not shown).

The laser beam that has passed through the modulator 4 is reflected by the plane reflecting mirror 13, changes direction, and enters the condenser lens 7.

The condensing lens condenses the laser beam into a diameter of approximately 30 μm.
m (shows the diameter at 1A2 to show Gaussian distribution)
The recording medium 8 is mounted on a rotary table 14, and the rotary table 14 is rotated at high speed by a motor 15.

On the other hand, the reflecting mirror 13 and the condensing lens 7 are attached to a linear moving table 16, and are moved linearly by a motor 10 and a screw 11 in conjunction with the rotation of the rotary table 140, and the focused laser beam is The recording medium 8 is scanned in a spiral manner by the rotation of the table 140 and the movement of the linear moving table 16, and an image 12 is formed on the recording medium 8.

At this time, since the rotary table 14 required high-precision rotation, it was supported using an air bearing and had a diameter of 300 mm. The axial and radial deflection of the rotary table 14 due to the air bearing was within 2 μm. This value is a spot size of 30μ.
m, and the image recorded on the recording medium 8 was good. With this configuration, a highly accurate image could be obtained without requiring an expensive rotating mirror.

Effects of the Invention In short, the present invention scans the surface of the recording medium by placing a recording medium on a rotary table, rotating a rotary table, and moving a reflecting mirror and a condensing lens linearly in the diameter direction of the rotary table. The present invention provides an image recording device that forms an image on a recording medium, and this configuration eliminates the need for an expensive rotating mirror, making it possible to use high-precision, low-cost flat scanning facsimiles and printers. , it becomes possible to manufacture plotters, and this can greatly contribute to the spread of these devices.

[Brief explanation of drawings]

Figure 1 is an overview diagram showing an example of a conventional image recording device;
The figure is a general view of an image recording apparatus in an embodiment of the present invention. 1... Laser oscillator (light source), 7...
Condensing lens, 8... Recording medium, 13...
・Plane reflector, 14...Rotary table, 16.
・・・・・・Linear moving platform.

Claims (1)

[Claims] a reflecting mirror that reflects the beam from the light source; a condensing lens that focuses the beam reflected by the reflecting mirror onto a recording medium; and a rotary table on which the recording medium is placed and rotated.
An image recording apparatus characterized by comprising means for linearly moving the reflecting mirror and the condensing lens in a radial direction of a rotary table.