JPS5880613A - Optical scanning method and optical scanner - Google Patents

Abstract

PURPOSE:To execute scanning at a high speed, by simultaneously scanning plural scanning lines by a hologram disk. CONSTITUTION:A light beam from a laser 1 is changed as to its longitudinal and lateral beam diameter ratio by a beam converter 2, and is irradiated to a space modulator 3. As for the modulator, it is obtained by arraying plural optical modulators using an electrooptical effect in one-dimension, but when an acoustic-optical modulator driven by multi-frequency is used, it is also possible to convert an angle-deflected output light from the modulator, to position deflection by a lens, without changing the longitudinal and lateral ratio of an irradiating beam 4. A hologram disk 5 executes scanning of the number of times of scanning which is equal to the number of holograms, by its one rotation, but since each hologram is arranged so that an image of the space modulator 3 is formed on a scanning surface 16, scanning of the number of scanning lines, which is equal to the number picture elements of the space modulator is executed simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION This issue #4 relates to an optical scanning method and a round optical scanning device, particularly those used in devices such as a laser beam printer that performs printing by scanning a laser beam. The present invention relates to an optical scanning method and apparatus.

Conventionally, high-speed optical scanning devices used in laser printers and the like have used a combination of a rotating polygon and an f/theta lens. High-speed rotation was difficult, and high-speed optical scanning was not possible.

Therefore, an optical scanning device for a disk using an 11-fold hoarder has been proposed. That is, by arranging a plurality of holograms along the eight circumferences of the disk and rotating the disk, as many scanning lines as the number of holograms are scanned per rotation of the disk. Due to the size of the disk, the problem of air resistance during rotation is greatly improved, but in order to perform high-speed scanning, the radius of the disk must be made thicker.
It is necessary to either increase the number of m or increase the number of rotations of the disk, which places a large load on this rounding device, and the use of air bearings means that the device becomes bulky.
Maru has the disadvantage of being expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical scanning method and a pre-scanning IT device that can perform high-speed scanning without the above-mentioned drawbacks.

This 11110 light scanning method grows multiple pixels in a direction perpendicular to the scanning direction (hereinafter referred to as a by-product).
This optical scanning method is characterized in that a dimensional optical pattern is converted into a scanning image using a hologram lens, and the image of the one-dimensional optical pattern is scanned by moving the hologram lens.

There are many possible optical scanning devices that can implement the method of this invention. In A, a one-dimensional spatial modulator having a plurality of pixels in the sub-scanning direction, a light beam generator that emits the spatial modulator, and a P3 disk that rotates around the center of the spatial modulator are mounted. This optical scanning method is realized by using an optical scanning device consisting of a hologram lens that focuses an image on the scanning surface and a hologram disk in which multiple lenses are placed at different intervals in the circumferential direction. .

Hereinafter, the optical scanning method and optical scanning device of the present invention will be explained together with examples. Note that the optical scanning method will be explained based on the operation of the optical scanning device.

The figure is a schematic diagram showing an embodiment of the optical scanning device of the present invention. In Own414, the light beam generator is composed of a laser l and a beam converter 2 consisting of a cylindrical lens installed on the output end side of this laser, and the light beam from the laser l is converted by the beam converter 2. The beam diameter ratio of the vertical and horizontal beams can be changed. ! The interpolator 3 is located at a position that is irradiated with the light beam 4 from the light beam generator.
A plurality of Ii1 cables are arranged in the sub-scanning direction. As a spatial modulator, a one-dimensional array of nine optical modulators using an electro-optic effect is suitable for high-speed operation.

In addition, the nine light Ral1
II devices are also suitable. In the case of a light quality device with an acoustic optical effect of 1, it operates as a deflector and modulates the degree of light IiM in a specific direction, so it is necessary to change the aspect ratio of the irradiation beam 4! However, since the output light of the light R adjuster is oriented at an angle, spatial changes can be made by converting it into positional deflection using a lens.
l! It is operated as a. The hologram disk 5 is installed at a position where the hologram is irradiated with the output light 6 of the spatial modulator 3 so as to be rotatable about an axis 7 passing around the center of the disk. C's Hoglum Disc 5
Is there a hologram on the disc? 8 to 15 in the circumferential direction Klk
! It appears in the configuration that was placed, and the Hodara person disk 501
By rotating, scan the number of hogura^ and the number of scans. Hologram disk 5 is a hologram that changes space!
Since it is arranged in a machine that forms 30 images on the scanning image 16, the number of scanning lines equal to the number of pixels of the space transformer #4 is simultaneously scanned in one O scan. That is, scan@
1g is scanned by one column 17 of dots having the number of dots in the sub-scanning direction equal to the prime number jl of the spatial modulator. Care must be taken to improve the imaging properties of the lens.

Therefore, we created a Hoglam (Sogan@
No. 53-11711), and Hodarajin Cchigan Sho 54-78495, which was produced by combining the phases of multiple spherical waves.
It is preferable to use

As detailed above, according to the device BAK, since the Hologram disk is used, the air resistance during rotation is small, and the tIA
High-speed scanning is possible with the rotation of the shield plate.In addition, multiple scanning lines are generated simultaneously, so the scanning speed can be significantly increased compared to conventional methods. Furthermore, the hologram disk can be mounted directly using an embossing method in the case of an optical surface relief hologram, and in the case of a volume hologram, it can be reproduced on a photosensitive material using coherent light, so it can be manufactured at low cost.

[Brief explanation of the drawing]

0 shots from the diagram! FIG. 2 is a configuration diagram showing an example. In the figure, 1 is a laser, 2 is a beam converter, 3 is a spatial RII device, 5 is a hologram disk, 8 to 15 are holograms, 16 is a scanning surface, and 17 is one row of dough.

Claims (1)

[Claims] 1. 1 having a plurality of pixels in a direction perpendicular to the scanning direction
An optical scanning method comprising: forming an image of a dimensional optical pattern on a scanning surface using a hologram lens, and scanning the image of the one-dimensional optical pattern by moving the hologram lens. 1. A one-dimensional space modulator having a plurality of pixels in a direction perpendicular to the scanning direction, a light beam generator that irradiates the spatial modulator, and a space ** An optical scanning device consisting of a HODARAM disk in which a plurality of Mfb Hop Hop DARAM lenses are arranged circumferentially on the scanning surface of the * image.