KR920006587B1 - Parallel-measuring apparatus of light axis - Google Patents

Abstract

The measuring device of optical axis has at least one of beam spot survey mean among multiple optical means (D1)(D2), a center setting mean, a collimator (C) being located on the optical axis (X1)(X2) of the multiple means (D1)(D2), a light reflecting target (T) being located at the secondary target of the collimater (C). The target (T) has a control point (t) in the device, a sensitizing paper (R) being attached at the target (5), and at least one beam route modifying mean between the collimator (C) and the target (T).

Description

Optical axis parallelism measuring device

1 is a conceptual diagram showing the configuration of a conventional measuring device,

2 is a conceptual diagram showing the configuration principle of the measuring device according to the present invention,

3 is a mechanical diagram showing a preferred embodiment of the measuring device of the present invention.

* Explanation of symbols for main parts of the drawings

c: collimator T: target

t: reference point R: photosensitive paper

LRF: Laser Range Finder

M1, M2: 1st and 1st reflector 1: (laser) light transmitting part

2: transmitting optical system 3: receiving optical system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical axis parallelism measuring apparatus, and more particularly, to an optical axis parallelism measuring apparatus suitable for measuring optical axis parallelism of optical equipment having a plurality of optical means arranged in parallel.

For example, high-magnification telescopes such as astronomical telescopes have a narrow field of view, making it difficult to capture observations, so it is common to install an auxiliary telescope for capturing observations in parallel, such as a laser range finder. Even in a laser instrument, an optical telescope for aiming is usually installed parallel to the laser beam optical axis in order to capture the observation object to be surveyed. Also, in a laser processing machine such as a laser cutting machine or a laser welding machine, an observation mirror such as a microscope is also generally provided in parallel with the laser transmission optical axis for setting the processing position of the workpiece. These primary and secondary optical means can maintain the accuracy and reliability of observation or processing only when each optical axis maintains the exact parallelism of each other. setting).

Conventionally, the method mainly used for measuring the optical axis parallelism is to use a parabolic mirror that focuses incident parallel light at one focal point. In addition to the problem of screening, there is a problem that the size of the parabolic mirror is too large, so that the so-called non-parabolic mirror of the form cut off a part of the parabolic mirror has been mainly used.

Shown in FIG. 1 is a conceptual diagram of a measuring device using a non-parabolic parabolic mirror, which is a target having a reference point set on a focal plane on the focal plane of the non-parabolic parabolic mirror M having a portion cut out of a parabolic surface indicated by a dotted line. (標; T) is provided and coincides with the reference point of either the first optical means D1 or the second optical means D2, and the center of the other optical means D2 or D1 is the target T. The degree of parallelism between the optical axes X1 and X2 of the both optical means D1 and D2 is measured by determining whether or not the reference point is equal to the reference point. Here, the means for matching the center of each optical means D1 and D2 with the center of the target T may be observed by cross hairs, spot beam irradiation of a laser beam, or photosensitive paper. I) will be used.

By the way, the parabolic diameter used in the conventional measuring device is very expensive because the design and manufacturing is very difficult, the focus is not located on the center line, there was a problem that the position of the focus must be set before the measurement. The identification of this focus was also a very difficult task, which made it impossible to make formal predictions, so it had to rely on trial-and-error methods, which required a lot of time and effort. In addition, the focal plane on the focal point is formed to be inclined with the centerline of the non-axis parabolic mirror. In such a conventional measuring device, the relative position between the parabolic parabolic mirror and the target on the hyperplane is changed while changing the relative position of the measuring device and the optical means to be measured for setting the measuring device. There was a hassle to set distance and angle. In addition, the hassle of setting the device inevitably induces a setting error, so there is a problem that the tolerance of the measurement result is large and its reliability is low.

It is an object of the present invention to provide an optical axis parallelism measuring apparatus, which has been created to solve the above-mentioned conventional problems of the present invention, in which component parts can be easily set at low cost and easy to obtain accurate measurement results.

In order to achieve the above object, the optical axis parallelism measuring apparatus according to the present invention is a device for measuring the parallelism between optical axes of a plurality of optical means, the collimator (collimator) and the collimator located on the optical axis of the plurality of optical means Characterized in that it comprises a target located on the post-focus of the.

Here, the target is provided with a reference mark including a reference point, and each optical means is provided with a center setting means such as a crosshair, or the target is provided with a photosensitive display means such as a photosensitive paper, and at least one of each optical means is a spot such as a laser transmitter. It is preferable to have a beam irradiating means and the other optical means to have a center setting means. In order to reduce the size of the measuring device, one or a plurality of plane mirrors or prism, which change the path of the optical axis, between the collimator and the target. It is preferable that the optical path changing means of the.

Hereinafter, exemplary embodiments of the measuring apparatus of the present invention will be described in detail with reference to the accompanying drawings.

Shown in FIG. 2 is a conceptual diagram showing the membership of the measuring device of the present invention, which is located on the optical axis (X1, X2) of the first optical means (D1) and the second optical means (D2), on a postfocal point. There is a collimator (C) for converting the light source into parallel light or focusing the parallel light into a post-candle phase, and a position away from the collimator (C) by its back focal length (fb), that is, of the collimator (C) The target T is located on the initial surface of the posterior focal point.

In such a configuration, when the optical axes of the first optical means D1 and the second optical means D2 are parallel to each other, the spot beam or line of sight from both optical means D1 and D2 is the target T. One point of the image, for example, the focus point (t), if not parallel is not focused.

Thus, for example, when the optical axis X1 of the first optical means D1 coincides with the reference point t of the target T, this reference point t coincides with the center line of the field of view of the second optical means D2. In this case, it can be determined that the optical axis X2 of the second optical means D2 is parallel to the optical axis X1 of the first optical means D1, in which case the first optical means D1 and the second optical The means D2 can be said to be adjusted to precise parallelism.

In addition, a spot beam such as a laser beam irradiated from the first optical means D1 to the reference point t of the target T is observed to coincide with the center line of the second optical means D2 in a direct or indirect manner, or the second optical When the center line of the field of view of the means D2 is observed with the reference point t of the target T, the spot beam irradiated from the first optical means Dl lands at the reference point t of the target T. If it is observed landing, it can be judged that both optical means (D1, D2) are parallel.

3 is an embodiment in which the above-described configuration principle of the present invention is applied to a laser filter, in particular, the illustrated laser range finder (LRF) is a so-called bi-axis type laser pulse measuring device. The light-transmitting part 1 and the light-transmitting optical system 2 which oscillate, and the light-receiving optical axis X1, X2 of the light-receiving optical system 3 which are the aiming mirrors for capturing an observation object are provided. Here, the light receiving optical system 3 includes an objective part 4 and an alternative part 5, and spectroscopically measures the incident light through the spectroscopic part 6 to calculate the measurement distance by the light receiving part 7 counting the reflected laser pulses in the incident light. It is configured to process.

A collimator C is provided on the path between the light transmission axis X1 and the light reception axis X2, and the first and second reflecting mirrors M1 and M2 for converting the optical path are provided on the downstream side of the path, and the target is located on the downstream side. (T) is installed. Where the distance (d1) between the collimator (C) and the first reflecting mirror (M1), the distance (d2) between the first reflecting mirror (M2) and the second reflecting mirror (M2), the second reflecting mirror (M2), and the target (T) The sum of the distances d3 between the two becomes the postfocal distance fb of the collimator C. Although not shown, the collimator (C), the first and second reflectors (M1, M2) and the target (T) are preferably configured to be appropriately adjusted as necessary by providing an appropriate angle and position adjusting means, respectively. .

On the other hand, in order to prevent the light receiving unit 7 from being damaged by incidence of a high-power laser beam at a short distance to the light receiving optical system 3, a band pass filter which blocks light transmission in the laser wavelength band and transmits only light in the visible light band. It is preferable to provide a filter (8), and is provided with an aperture mechanism such as a slit plate that adjusts the amount of incident light as necessary to prevent the incidence of excessive amount of light. The light receiving optical system 3 is further provided with a crosshair 9 suitable as a center setting means for checking the center of the viewing field.

On the other hand, the target T is preferably formed with a reference mark made of coaxial concentric circles, for example, around the reference point t, and the target T is a photosensitive display means such as a photosensitive paper or a photosensitive dry plate. It is configured to be configured such that a separate photosensitive display means such as a photosensitive paper (R).

The measuring device of the present invention configured as described above operates as follows.

First, adjust the first reflecting mirror M1 and / or the second reflecting mirror M2 so that the reference point t of the target T coincides with the center of the collimator C, and the target T is correct for the collimator C. Adjust the relative distance so that it is located on the surface.

The laser measuring device (LRF), which is the next measuring device, is positioned in front of the collimator C, and the center of the crosshair 9 and the reference point t of the target T through the alternative part 5 of the light receiving optical system 3. ).

Next, the photosensitive paper R is attached to the target T, and the light transmitting unit 1 is driven to emit a laser beam to expose the photosensitive paper R to form a photosensitive point.

Next, by observing the photosensitive paper R on the target T through the alternative part 5 of the light receiving optical system 3, it is observed whether this photosensitive point coincides with the center of the crosshair 9.

In case of coincidence, it is judged that the light transmission axis X1 and the light reception axis X2 are parallel within the accuracy of the measurement. Otherwise, the relative distance is adjusted to match the center of the crosshair 9 by adjusting the relative distance. The parallelism of the two optical axes is measured and adjusted.

As described above, the optical axis parallelism measuring apparatus according to the present invention is very easy and inexpensive to design, manufacture or obtain the components thereof, compared to the conventional measuring apparatus using a non-axis parabolic mirror, the setting is very easy and the measurement result In addition, there are various advantages with high precision and high reliability, which can have a great effect on the fabrication of high precision optical equipment.

Claims (4)

An optical axis parallelism measuring apparatus for optical equipment having a plurality of optical means (D1) and (D2) provided in parallel, wherein at least one of the plurality of optical means (D1) and (D2) beam spot irradiation means and center setting means And a collimator C positioned on optical axes X1 and X2 of the plurality of optical means D1 and D2, respectively, and reflecting the hammer light positioned on the postfocal point of the collimator C. Optical axis parallelism measuring apparatus comprising a target (T) configured to. The optical axis parallelism measuring apparatus according to claim 1, wherein a reference mark having a reference point t is displayed on the target T. The optical axis parallelism measuring device according to any one of claims 1 to 3, wherein a photosensitive paper (R) is attached to said target (T). The optical axis parallelism measuring apparatus according to claim 1, wherein at least one optical path changing means is provided between the collimator (C) and the target (T).

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