JPH0428006Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention detects the position of a point arbitrarily set on the object surface or the shape of a line segment when measuring the three-dimensional shape of an object to be measured, for example. The present invention relates to a beam light distance measuring device that has been improved so as to be able to.

(Prior Art and its Problems) There is an apparatus that irradiates a measured object with a beam of light and receives the reflected light to measure distances to various parts of the measured object. By scanning the entire object to be measured with the beam light, the position of each part of the object, that is, the three-dimensional shape of the object can be measured. FIG. 4 shows the basic configuration of a conventional beam light distance measuring device. In the example shown in FIG. 4, a laser tube is used as the beam light oscillator, and the object to be measured is the body of an automobile. The scanning means includes a mirror 21 that rotates while turning up and down and a mirror angle detection mechanism 2.
It is composed of 2. The beam light 11 emitted from the laser tube 1 is reflected by the mirror 21 of the scanning means and is irradiated onto the entire vehicle body 91. The mirror angle detection mechanism 22 detects the irradiation angle of the beam light using the data processing circuit 4.
Send to. The incident light 11 of the irradiated beam is
Diffuse reflection occurs on the surface of the vehicle body, and part of the diffusely reflected light 12 enters the light receiving sensor 3. The light receiving sensor 3 sends the signal to the data processing circuit 4. The data processing circuit 4 calculates the position of each part of the vehicle body from the irradiation angle of the beam light given from the angle detection mechanism 22, and detects the three-dimensional shape of the vehicle body. The measurement of the shape of an object using this device is highly accurate, and because it is not performed by directly contacting the object with a contactor, it can be applied to objects with complex shapes, and the operation is simple and quick. For these reasons, this device is widely used in the car bodies and aircraft bodies mentioned above. At that time, there is a desire to detect not only the shape of the object, but also the position of an arbitrary point on the surface of the object or the shape of an arbitrary line segment. For example, if the cross-sectional shape of a car body can be measured at an arbitrary cross-section, it can be used to inspect the dimensions of that cross-section, or conversely, the cross-sectional shape of the car body can be copied onto a drawing. This becomes possible if it is possible to distinguish between reflected light from an arbitrary point or line segment and reflected light from other parts.
However, conventional devices do not have such discrimination ability.

An object of the present invention is to provide an improved optical beam distance measuring device that meets the above-mentioned needs.

(Means for Solving the Problems) As shown in Fig. 1, the beam light distance measuring device of the present invention irradiates the object to be measured with a beam light and receives the reflected light, and measures each part of the object to be measured. A device for measuring distance, which includes a beam light oscillator, a scanning means for scanning an object to be measured with the beam light, a light receiving sensor for receiving reflected light, and a signal from the scanning means and the light receiving sensor. In a beam light distance measuring device basically composed of a data processing circuit that processes and calculates a distance, the light receiving sensor is a first light receiving sensor, a beam light reflecting device, a second light receiving sensor, and a beam light receiving sensor. A determination circuit that inputs signals from the first and second light receiving sensors and sends the output to a data processing circuit is added, and the reflecting device is placed at an arbitrary location on the object to be measured, and the reflected light is transmitted to the second light receiving sensor. The determination circuit sends a signal to the data processing circuit when the beam light is incident only on the second light receiving sensor, and the data processing circuit receives the output signal of the determination circuit and the scanning means. The method is characterized in that the position of the reflecting device is calculated by processing the signal.

(Embodiment) The operation of the optical beam distance measuring device of the present invention will be explained with reference to the embodiment shown in FIG. In this embodiment, the second aspect of the present invention is selected, in which a half mirror is used as the second reflecting device in addition to the first reflecting device. The object to be measured is the body of a car. Other components such as a beam light oscillator, scanning means, light receiving sensor, and data processing circuit are the same as those in FIG. 4 described above. The judgment circuit 7 has a first and a second
An AND circuit was used that inputs the signal from the light receiving sensor. The AND condition was made to be satisfied when the reflected light does not enter the first sensor but only enters the second sensor. The first reflector 5 is the third
As shown in the figure, hold two mirrors so that their reflective surfaces are 90° to each other.
A combination of these was used. car body 91
Seven reflectors 5 were installed at appropriate intervals along a center line 92 that equally divided left and right. All of these were tilted and set so that the optical axis of the reflected light passed through the center of the rotating mirror 21.

A light beam 11 emitted from the laser tube 1 passes through a half mirror 61 located on the optical axis and enters the rotating mirror 21 . The rotating mirror 21 irradiates the entire vehicle body 91 with a beam of light by swinging its head up and down while rotating. The beam light 11 irradiated to the part where the reflector 5 is not attached causes diffuse reflection there, and a part of the diffuse reflection light 12 is reflected by the first light receiving sensor 3.
1. The data processing circuit 4 calculates the three-dimensional shape of the vehicle body 91 from the signal from the first light receiving sensor and the irradiation angle of the beam light given from the mirror angle detection mechanism 22. On the other hand, the diffusely reflected light 12 also enters the second light receiving sensor 32 via the rotating mirror 21 and the half mirror 61. That is, since the reflected light 12 is incident on both the first and second sensors, the AND condition of the determination circuit 7 does not hold in this case. next,
When the light beam 11 enters the first reflector 5 disposed on the vehicle body 91, diffuse reflection does not occur and the reflected light beam 13 follows the path indicated by the broken line to the second light receiving sensor 32. and does not enter the first light receiving sensor 31. Thus, in this case
Since the AND condition is satisfied, a signal is sent from the determination circuit 7 to the data processing circuit 4. Similarly to the above, the data processing circuit 4 calculates the position of the first reflecting device 5 from the irradiation angle of the beam light 11 at that time.
In this way, the three-dimensional shape 91A of the vehicle body 91 was measured, and the positions of the reflectors 5 lined up on the center line 92 that equally divided the three-dimensional shape could be plotted.

The reflected light from the first reflecting device may be directly guided to the second light receiving sensor, but if necessary, a second reflecting device may be provided and the light may be relayed thereto. If a half mirror is used as the second reflecting device, as in the above embodiment, it can be placed on the optical axis of the incident beam.

It is better for the first reflector to be as small as possible,
The area of the reflective surface must not be smaller than the spread of the beam of light. This is because diffuse reflection occurs when the beam light leaks to the object to be measured. If the reflector is constructed as shown in FIG. 3, high reflectance can be obtained because total reflection of the mirror surface can be utilized. If the mirror surface is made perpendicular to the incident light, the reflectance will drop, but it can be made very compact.

(Effects of the Invention) The optical beam distance measuring device of the present invention can measure the three-dimensional shape of an object to be measured, and can also detect the position of any point on the surface of the object to be measured or the shape of any line segment.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing the main configuration of the device of the present invention. FIG. 2 is a conceptual diagram showing the configuration of one embodiment of the device of the present invention. FIG. 3 is a side view showing an example of a reflective device. FIG. 4 is a conceptual diagram showing the configuration of a conventional apparatus applied to the same object to be measured as in FIG. 2. 1... Laser tube, 11... Incident light, 12... Diffuse reflected light, 13... Reflected light, 21... Rotating mirror,
22... Mirror angle detection mechanism, 3... Light receiving sensor, 31... First light receiving sensor, 32... Second light receiving sensor, 4... Data processing circuit, 5... First reflecting instrument, 61... Half mirror , 7...determination circuit,
Object to be measured, 91... Vehicle body, 91A... Three-dimensional shape of vehicle body, 92... Center line of vehicle body.

Claims (1)

[Claims for Utility Model Registration] (1) An oscillator that generates the beam light, which is a device that irradiates an object to be measured with a beam of light, receives the reflected light, and measures the distance of each part of the object to be measured. a scanning means for scanning the object to be measured by controlling the direction of the beam light output from the oscillator; a light receiving sensor for receiving the reflected light; and a scanning means for processing signals from the scanning means and the light receiving sensor. In the beam light distance measuring device, the light receiving sensor is a first light receiving sensor, and a beam light reflecting device, a second light receiving sensor, and the first and second light receiving sensors are provided.
a determination circuit that inputs a signal from the second light receiving sensor and sends an output to the data processing circuit; The determination circuit sends a signal to the data processing circuit when the beam light is incident only on the second light receiving sensor, and the data processing circuit receives the output signal of the determination circuit. and a beam light distance measuring device characterized in that the position of the reflected instrument is calculated based on the signal from the scanning means. (2) Utility model registration claim No. 1, in which the reflecting device is a first reflecting device, and a second reflecting device is provided which relays and reflects the reflected light of the first reflecting device and guides it to a second light receiving sensor. The optical beam distance measuring device according to item 1. (3) A request for registration of a utility model in which the second reflecting device is a half mirror, which is arranged on the optical axis between the beam light oscillator and the scanning means, with the light transmitting side facing the beam light incident side. The optical beam distance measuring device according to item 2.