JPS63147138A - Laser scanner - Google Patents

Abstract

PURPOSE:To make a comparison with a preset reference position signal and to accurately position a laser scanner by irradiating the reflecting surface of a mirror mount shaft part with light from a light emitting element at an external position and detecting its reflected light from a light receiving element at the external reference position. CONSTITUTION:The laser light from the external laser light source is passed through a beam expander 13, reflected by an X-axis mirror 17 and a Y-axis mirror 18, and transmitted through an Ftheta lens 14 to obtain a laser output. The laser light obtained through the Ftheta lens 14 is set initially to the reference point position to which the laser light is lowered at right angles, so the X-axis mirror 17 and Y-axis mirror 18 are positioned at 45 deg. to the optical axis of the laser light. When X-axial positioning is performed, light emitted as a pulse by an X-axial light emitting element 20 is projected on an X-axial reflecting surface 24 provided to a side part of an X-axial mirror mount 19 and its reflected light is detected by an X-axial light receiving element and converted into an electric signal proportional to the light reception position, so that the signal is outputted. Consequently, a comparator compares the signal with the preset reference position signal to hold the laser scanner at the reference position at all times, and the positioning is completed by short-time adjustment.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary laser scanner for scanning laser light in a laser processing machine or the like, and to a laser scanner that improves assembly accuracy.

(Conventional technology) Conventionally, laser processing machines (laser markers, laser trimmers)
It is well known that rotary laser scanners are used in equipment, video, and the like.

FIG. 5 is an explanatory diagram showing the mounting state of a conventional laser scanner, in which 1 is a drive control part 2 of a rotary laser scanner, a mirror mount shaft part 3 is a mirror 4, and 5 is a mounting screw.
indicates housing.

Conventional laser scanners are mounted using simple four-point bolts.

(Problem that the invention seeks to solve).

Since such conventional laser scanners were simply bolted together, they had the disadvantage that they did not have fitting eyes or positioning dowel pins, making it difficult to set the reference position, and that assembly was not reproducible due to mounting and dismounting.

For this reason, it takes a long time to adjust the optical axis, resulting in downtime for the system, and if the laser scanner has an algebra, there is also the problem that the positions cannot be determined individually.

(Means and effects for solving the problems) The present invention has been made to solve the above problems.

In other words, a reflective surface is provided on the mirror mount shaft,
The light from the optical element installed at the external reference position is applied to the reflective surface, and the reflected light is detected by the light receiving element also installed at the external reference position, and the laser scanner compares it with a preset reference position signal. It is used for positioning.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram for explaining an embodiment of a laser scanner according to the present invention.

In the figure, 11 is an X-axis scanner, 12 is a Y-axis scanner, 13 is a beam expander, 14 is an Fθ lens, 1
5 is a Y-axis mirror mount shaft part, 16 is a Y-axis peripheral light emitting element, 17 is an X-axis mirror, 18 is a Y-axis mirror, 19 is an X-axis mirror
Axis mirror mount shaft, G part, 20 is an X-axis angle light emitting element, 21 is a housing, 22 is a Y-axis light receiving element, 23 is an X-axis light receiving element, 24 is an X-axis angle facing side, 25 is a Y-axis angle radiation surface, respectively. show.

FIG. 2 is an X-direction arrow view as viewed from the X-direction in FIG. 1.

In this embodiment, a laser beam from an external laser light source (not shown) is passed through a beam expander 13 to an X-axis mirror 1.
7. The light is reflected by the Y-axis mirror 18, transmitted through the Fθ lens 14, and extracted as a laser output. If you want to scan the laser beam linearly, fix the X axis and
This can be achieved by rotationally driving the axis, or by simultaneously moving the X and Y axes by yXA if it is desired to scan the laser beam in a curved manner.

In this case, first, in order to initially set the laser beam obtained by passing through the Fθ lens 14 to a reference point position where it descends in the perpendicular direction, the Each must be positioned at a 45° angle.

FIG. 3 is a system block diagram for initial setting, and FIG. 4 is a flowchart thereof.

As the light emitting element 20.16, a semiconductor laser, an infrared LE
D, etc. are used, and as the light receiving elements 22 and 23, linear IC5CCD elements or the like are used.

To explain the X-axis now, pulsed light from the X-axis angular light emitting element 20 is applied to the X-axis incident surface provided on the side of the X-axis mirror mount 19, and the reflected light is sent to the X-axis light receiving element 22.
The position signal converter 30 converts the signal into an electric signal (P) proportional to the light receiving site and outputs the signal.

On the other hand, a comparator 32 compares the design reference position with a reference position signal (R) set by a reference signal setter 31, and a determination unit 33 indicates whether positioning is complete or incomplete.

Note that the Y axis is also similar to the X axis.

(9) Effect of the Invention) As is clear from the above description, according to the present invention, the light receiving surface (reflecting surface) receives light from the light emitting element from a fixed position.
is installed on the mirror mount shaft, and the reflected light from this surface is converted into a charge conversion element (linear t
Since positioning is completed by converting it into a position signal using a preset reference position signal (e.g. C) and checking it with a preset reference position signal using a comparator, the reference position can be maintained at all times, and the adjustment can be completed in a single time. It can also be used as

Note that even if this method is adopted, it does not affect the high-speed responsiveness of the scanner at all.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the laser scanner according to the present invention, Figure 2 is a view taken in the X direction in Figure 1, Figure 3 is a system block diagram for initial settings, and Figure 4 is for initial settings. FIG. 5 is an explanatory diagram showing the mounting state of a conventional laser scanner. 11...X-axis scanner 12...Y-axis scanner 13...beam expander 14...Fθ lens 15...Y-axis mirror mount I/shaft section. 16...Y-axis circumferential light emitting element 17...X-axis mirror 18...Y-axis mirror

Claims (1)

[Claims] A reflective surface provided on the mirror mount shaft of a rotationally driven laser scanner, a light emitting element that emits light onto the reflective surface, a light receiving element that receives reflected light from the reflective surface, and a detection signal and reference from the light receiving element. 1. A laser scanner comprising: a determiner for comparing a signal with a signal.