JPH01101506A - Optical axis matching device - Google Patents

Abstract

PURPOSE:To rapidly and easily match an optical axis by receiving a laser beam, measuring the receiving position as an image and then displaying the measured result in the visual field of a collimation optical system. CONSTITUTION:A reticle signal 9 having its center E on an origin corresponding to the visual field center of an image pickup element 14 is displayed on a display device 22 by initial operation. When a laser beam is radiated from a laser range finder 1 and transmitted, the optical axis of the laser beam is detected, its positional data 19 is inputted to a reticle generating circuit 20 and then a reticle 25 is displayed on a position corresponding to the positional data 19 on the display device 22. Thereby, an operator adjusts the collimation reticle while observing the visual field of collimation and makes the collimation reticle image 9 coincide with the reticle image 25 displayed on the display device 22, so that a laser transmission axis can be easily matched with a collimation axis.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The invention relates to an optical axis alignment device that facilitates alignment of a laser transmission axis of a laser distance measuring device and an optical axis of a reference optical system.

[Conventional technology]

FIG. 3 is a diagram illustrating a conventional method of aligning the laser optical axis of a laser range finder with a reference axis, in which (1) shows the laser range finder, (2) shows the transmission optical system, and ( 3) is the standard optical system, and (4) H eyepiece.

(5) Collimated light from the end of the halasor rod.

(6) is a collimator light, (7) is a collimator, and (8) is a collimator eyepiece.

In FIG. 3, the collimator (7) is initially installed at the position indicated by the dashed line in FIG. Transmission optical system (collimated light from the end face of the laser rod observed through 211ft (5)
The light is received by the wokolimator (7).

First, the relative position and angle of the laser distance measuring device (1) with respect to the collimator (7) are adjusted so that the center of the laser rod end face image visually observed through the eyepiece (8) is aligned with the optical axis center of the collimator (7). be done.

After the above-described operation, the collimator (7) is translated in parallel to the position indicated by the solid line in the figure using the parallel moving mechanism attached to the collimator (7). At this position, the collimator (
7), the collimator light +6) of the reticle centered on the optical axis of the collimator (7) is the laser distance measuring device i! +11
is input to the reference optical system (3). Therefore, when looking through the eyepiece lens +41, the reticle image can be seen within the standard field of view of the laser distance measuring device (1).

FIG. 4 is a diagram showing how I look within the above-mentioned standard field of view, and shows +91&'! Collimator ()) reticle image,
11 (It! Laser distance measuring device (11 standard optical system (3)
) is the reference reticle image.

In FIG. 4, as is clear from the above explanation, the intersection of the reticle image TIl of the collimator (7) is located at the optical axis position 1! of the transmission optical system (2). Therefore, in this figure, the transmission optical axis is shifted by 1 shown in FIG. 9 from the reference optical axis represented by the white center of the reference reticle (9). Therefore, in the conventional optical axis alignment operation, the reference reticle position of the laser range finder m1 fil is adjusted while viewing the above-mentioned reticle image through the eyepiece, so that the reference reticle image α1 becomes the reticle image α of the collimator (7). I made it overlap with [.

[Problem that the invention seeks to solve]

In this way, conventionally, it is necessary to first see the end face of the laser rod inside the transmitting optical system (2) through the collimator (7), but in order to make the end face visible to infinity with visible light, the transmitter It becomes necessary to remove the chromatic aberration of the optical system (2) in two wavelength bands: visible light wavelength and laser light wavelength (usually 1.06 μm). Therefore, there is generally a problem that the laser distance measuring device (1) is expensive.

Furthermore, as is clear from the explanation of the operation above, it is necessary to move the collimator (7) in parallel for each alignment, and the time required for optical axis alignment becomes long, which poses problems in terms of maintainability of the laser range finder. becomes.

The purpose of this Fi4rz is to realize an optical axis alignment device capable of optical axis alignment without the above-mentioned collimator operation.

[Means for solving problems]

The optical axis alignment device of this invention aligns the center of the transmitted laser beam by 1f.
It uses a means for detecting the flI image and displaying it on a reticle on a screen, and a collimator lens so that the reticle can be referenced by a reference optical system (3).

[Effect]

FIG. 1 is a diagram showing an embodiment of the configuration of the device according to the present invention and the positional relationship with the laser distance measuring device, in which αυ is a light receiving lens, ab is a collimator lens, (1 m is a semi-transparent jump,
aa is the 1M camera element, aSd amplifier, L1i is the A/D converter, fin is the binarization circuit, (Ill is the center of gravity @ calculation circuit,
as is the position data, ■ is the reticle generation circuit, 121 is the display circuit, RA is the display device, @ is the calorific value sensor, and @ is the display.

@1 As shown in Figure 2, initially, the reticle generation circuit ω generates a reticle signal centered at the origin corresponding to the center of the field of view of the image sensor Q4 by the initial operation, and the display circuit Qυ generates a reticle signal that is transmitted to the display device FIt, such as a cathode ray tube, etc. Appears in the mouth. This image is converted into a parallel beam by the collimator lens az,
It enters the reference optical system (3) of the laser range finder (exit) and can be recognized as an image within the reference field of view.

FIG. 2(a) is a diagram showing me in the above-mentioned reference field of view, and is the above-mentioned reticle image. light wavelength f
The angle of the order of c[Tl) is first adjusted.

Next, when a single laser beam is transmitted from the laser range finder (1), the power of the laser beam is divided and attenuated by the semi-transparent mirror a3, and the image is formed on the gI element I by the receiving lens all. Ru.

The output of the image sensor Q4 is amplified by an amplifier a5, converted to digital video by an A/D converter 1111, and then converted into a digital video by a binarization circuit using a predetermined end value to remove noise. Valued. The binarized signal is input to the center point arithmetic circuit r1 to obtain nine centroid points, thereby detecting the image center of the laser beam, that is, the laser optical axis. This position data α9 is input to the reticle generating circuit (3), and the reticle is then displayed on the display device @ at a position corresponding to the position data a9.

FIG. 2(b) shows the relationship between the reticle image (2) and the reference reticle confidence 9 at this time, and for the sake of explanation, the case is shown in which the laser transmission axis and the reference axis are deviated by E. Note that in FIG. 1, the intersection (to) of the reticle image (2) represents the detected laser beam position and is not displayed at the 1 display position @.

Therefore, the operator adjusts the reference reticle while looking at the reference field of view and aligns the reference reticle image 19) with the reticle image (to) displayed on the display device (to), thereby aligning the laser transmission axis and the reference axis. can be easily matched.

In addition, as shown in Fig. 1, by receiving the reflected light from the semi-transparent mirror a3 with a heat generation sensor @ and measuring the amount of heat generated by this,
Since the laser light power can be displayed on the display at the same time, the laser transmission power can also be confirmed, which can greatly contribute to improving maintainability.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to receive the laser beam and display the corresponding value vIIt within the field of view of the reference optical system after image measurement. Not only can axis alignment be achieved very quickly and easily, but the transmission optical system (2) only needs to eliminate convergence for the laser light wavelength.
This can greatly contribute to cost reduction of laser distance measuring devices.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an image within a standard field of view in this invention, FIG. 3 is a diagram showing a conventional optical axis alignment method, and FIG. 4 is a diagram showing a conventional optical axis alignment method. This is a diagram showing the image within the standard field of view in the method of
s is an amplifier, (1. is an A/D converter, an is a binarization circuit, Qlltl! center of gravity calculation circuit, (to) is a reticle generation circuit, Qυ is a display circuit. lZ3 is a display device. Inside, the same or corresponding parts are denoted by the same reference numerals.

Claims (1)

[Claims] a first optical system that receives a transmitted laser beam of a laser ranging device; an image sensor installed on an image plane of the first optical system; an amplification device that amplifies the output of the image sensor; an A/D converter that converts the output of the amplifier into analog and digital;
The digital video signal output from the A/D converter is
A binarization means for converting into a value, a barycenter point calculation circuit for calculating and outputting barycenter point position data in response to the binary video signal outputted by the binarization unit, and a barycenter point calculation circuit for calculating and outputting barycenter point position data in response to the output of the barycenter point calculation circuit. A means of generating and displaying this on the screen,
An optical axis alignment device comprising: a second optical system that converts a luminous flux emitted from the display image of the screen display means into a urimate light.