JPS58113909A - Optical scanner - Google Patents

Abstract

PURPOSE:To form easily a scanning pattern having a scanning line of the multi- direction by one hologram disk, by providing plural light sources at each different angle position against the hologram disk. CONSTITUTION:A light beam emitted from the first semiconductor laser 20 which is a light source is converted to the first incident beam 22, is diffracted and condensed, and is condensed to a point P on a scanning surface 8. When a hologram disk 1 is rotated, a scanning beam generated in order is deflected in the direction being parallel to a tangent of the hologram disk 1. As a result, a scanning pattern 25 of the number which is equal to that of the hologram lens is generated. Subsequently, optical beams emitted by the second and the third light sources 30, 40 also generate the second and the third scanning patterns 35, 45 having a direction being parallel to a tangent in points Q', Q'' on the disk 1 in the same way. In this way, it is possible to easily form a scanning pattern of a scanning line of the multi-direction by one hologram disk.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical scanning device in which a hologram scanner deflects and focuses a haze beam so that a light spot scans the scanning area.

Conventionally, there has been a saliva device 4 shown in Fig. 1.

In the figure, ... is a hologram disk, (21 is an arbitrary hologram lens recorded on the hologram disk fil.The number of hologram lenses corresponds to the number of scanning lines to be generated, and each r Hologram disk (1) only where its center touches the scanning line pitch
is recorded as being displaced in the radial direction. (3) Incident beam, 141.

(6) are the scanning beams of O1 and O8 +1611 which are diffracted to spatially separated positions, respectively (7' is a plane mirror that reflects the scanning beams 141 and 151, respectively;
#−i scanning plane * [91, nu is the scanning line generated by the scanning beam 41, fIIll, respectively, (u
) This is a motor that simultaneously rotates the H hologram disk 11.

Next, the operation will be explained.

An incident beam 131 with 1.+4Q as a point light source is set at the point Q on the hologram lens (21), and the hologram disk +11 is driven and rotated by a motor (It).

The primary traveling beam is generated by each hologram lens, but the most representative one is the Oho beam.

The second scanning beam is +41, t51. Since the center of each hologram lens is at position f, these Keisuke beams are shifted and deflected in a direction perpendicular to the tangential direction at point Q of the hologram disk +11, and are deflected in parallel to a number of holes equal to the number of hologram lenses. generates a scan line.

Here, in order to easily reduce the 9 constant of the plane mirror for changing the direction of the scanning line to y, the entire scanning beam is divided into two groups, and each group is spatially divided to generate one direct beam.

Next, the scanning beam (represented by 41) is placed at a predetermined angle angle 9 position by the plane mirror (6) of
is reflected by the scanning pattern (9) on the scanning surface (8).
) to form. Similarly, O8. scanning beam (6)
The scanning beam, represented by , is reflected by the second mirror 71 to generate a scanning pattern ttci. As a result of the above, a scanning pattern having two scanning directions is formed.

Since the conventional optical scanning device is configured as described above,
When generating a scanning pattern with multiple scanning directions, there is a spring type in which plane mirrors are set up in at least as many directions as required, and there are drawbacks such as grooves and sardines, and a limit to the increase in the number of scanning directions. was there.

A certain number of scanning lines must be divided in the number of scanning directions, which has the disadvantage that the number of scanning lines in each scanning direction is reduced.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and provides an optical scanning device that can easily form a scanning pattern having multiple scanning directions from the same hologram disk using a plurality of light sources. The purpose is to provide.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.・In Figure 8, en 1m and s) are respectively Ol.

E8. Semiconductor radar light source, which is the light source of O8, 211°6
υ and (goods) are respectively O1. E8. The condensing optical system of O8, and 4 are the incident beams of O1, 2nd, and O8, with point 0*aO' and point O'' as point light sources, respectively.

, 21 , 01 , IIG , #-! , respectively. Second. O8 hologram lens I 1241 [available]
, (44 digits, respectively O1, O8, and O8 scanning beams,
919 cans, 2) are each O1. Second. This is a running pattern for O8.

Each of the scanning patterns lats, (to) and (c) intersect on the scanning plane (8).

Next, I will explain about Sensaku. A light beam emitted from a first semiconductor laser (hereinafter referred to as LD) 4 serving as a light source is converted by a condensing optical system (211) into a first incident beam with point 0 as a point light source.

Next, the incident beam device is the tun Q of the hologram lens 1231
incident on . The incident beam (2) is refracted and condensed into a scanning beam (24) and condensed at a point PK on the scanning surface (8). When the hologram disk +11 is rotated, the scanning beams sequentially generated by each hologram lens are Q
It is deflected in a direction parallel to the tangent to the hologram disk fi+ at the point.

The center of each hologram lens used in this example is
Since recording is performed by displacing the hologram disk +11 in the radial direction, each scanning beam is shifted and deflected in a direction perpendicular to the tangential direction, corresponding to the displacement '@.

As a result of the above, ten pieces of parallel scanning lines, <Turf 12119, having a number equal to the number of hologram lenses V on the hologram disk +11 are generated.

Next, the second. Similarly to the above, the light beams emitted by the LD and the ship, which are the light sources of E8, are the second and third incident beams (E), respectively, which are point light sources at point '1'. ), and the points Q and '9' of the hologram disk Il+
are simultaneously incident on the Third. Scanning beam (2) of O8, H
ld, point Q'1 on the hologram disk ill generate scanning patterns (a) and (c) of 2.o8 having a direction parallel to the tangent at point Q''.

In the manner described above, a ten-eclipse pattern is formed in which the number of 1K runs in eight directions is determined. For example, point Q on the hologram disk
If 1 point Ql 1 point Q/r is in the relationship of the vertices of an equilateral triangle, what is the scanning pattern that has 3 directions with an intersection angle of 60° of scanning springs? U gets hit.

In the above embodiment, a case was shown in which a scanning pattern with scanning lines in eight directions was generated, but it is clear that a scanning pattern in eight or more directions can be easily generated by using light sources as many as the number of directions. be.

Although the case where the intersecting angles of the scanning lines are equal has been shown, it goes without saying that scanning lines with arbitrary intersecting angles can be generated by arbitrarily setting the hologram disk illumination point, that is, the point Q.

As described above, according to the present invention, a plurality of light sources are provided at different angular positions with respect to the hologram disk, and the light beams from each light source threaten each other as the hologram disk rotates. Since the surface is scanned in the direction, a scanning pattern having scanning lines in multiple directions can be easily formed using one hologram disk. Also,
The configuration of the scanning system can be simplified.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional optical scanning device, and FIG. 2 is a perspective view showing an optical scanning device according to an embodiment of the present invention. In the figure, number 111 is a hologram disk, (8) is a scanning surface, and the light source (I) is a hologram lens. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Shin Kuzuno - Figure 1 3 Figure 2

Claims (1)

[Claims] a hologram disc rotatably driven by at least one hologram lens for focusing and scanning a light beam; and a plurality of light sources disposed at different angular positions with respect to the hologram disc. An optical scanning device comprising: a light beam from each of the ρ light sources scans the scanning surface in different directions as the hologram disk rotates from one to the other.