JPH0557607U - Measuring point member for optical measurement - Google Patents

Abstract

(57) [Abstract] [Purpose] An object is to provide a self-illuminating measurement point member in which the position of the light emission center does not shift depending on the angle of imaging. [Structure] By disposing a lens cap and a correction lens on the front surface of the LED light emitting portion or by covering the front surface of the LED light emitting portion with a protective lens or a protective cover having no lens action, By accurately locating the LED light emitting portion on the extension line of the light beam radiated outward, it is possible to prevent the positional deviation of the LED light emitting portion due to the image capturing angle.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a measuring point member for optical measurement used in three-dimensional measurement with two or more CCD cameras.

[0002]

[Prior Art]

 As one of the three-dimensional measurement methods for measuring an object to be measured, such as the body of an automobile, the object to be measured is imaged using two or more CCD cameras, and the triangulation method is used based on the image data at this time. There is a measuring method for calculating the dimensions of the object to be measured.

In this measuring method, as shown in FIGS. 5 and 6, the solid-state sensor (3) serving as a light-receiving surface passes through the lens (2) of each CCD camera (1) at a predetermined position on the object to be measured (A). The center of the solid-state sensor (3) of the pixel (4) with the highest output among the many pixels (4) that make up the solid-state sensor (3) when a light beam from the light spot (P) formed on the From the CCD camera (1) to calculate the angle of the light spot (P) from each CCD camera (1).

Then, the position of the light spot (P) is calculated based on each angle data obtained from two or more CCD cameras (1).

In this way, the data from a large number of light spots (P) on the object to be measured (A) are sequentially calculated to obtain the three-dimensional dimension of the object to be measured (A). ing.

As a means for forming a large number of light spots (P) on the object to be measured (A), for example, a laser scanner is used, and laser spots are sequentially irradiated onto the object to be measured (A). Good.

By the way, in order to perform three-dimensional measurement by the above-described measuring method, it is necessary to detect the absolute positional relationship of each CCD camera (1) with respect to the object (A) to be measured in advance.

Therefore, before three-dimensional measurement using each CCD camera (1), first, a measurement reference point is set on the object to be measured (A) or at a plurality of points around the object to be measured (A). The measurement point member (10) is attached, and the position of each measurement point member (10) viewed from each CCD camera (1) and the position on or under the object to be measured (A) are measured in advance. The absolute position of each CCD camera (1) is calculated from the known dimension between two points.

Further, in the measuring point member (10), an LED light emitting part (12) is usually arranged at the center of the front surface of a cylindrical stem (11) as shown in FIG. 1 1) Incorporating a cap lens (13) on the front surface of the LED light emitting part (12) for protecting the LED light emitting part (12) and for irradiating the light beam from the LED light emitting part (12) evenly forward of the light emitting part. A measuring point member (10) serving as a light source is used.

[0010]

[Problems to be solved by the device]

 As described above, when the measurement point member (10) using the LED as the light source is arranged on the object under measurement (A) or around the object under measurement (A) and the image is taken by the CCD camera (1), The light emission center of the measuring point member (10), that is, the position of the LED light emitting part (12) appears to be different depending on the angle of the CCD camera (1) with respect to the measuring point member (10). When trying to measure with high accuracy, there was a problem that this would cause deterioration of measurement accuracy.

That is, since the cap lens (13) is attached to the front surface of the LED light emitting portion (12) of the measuring point member (10), the measuring point member (13) passes through the optical axis of the cap lens (13). The light ray (P1) that goes out to the front of 10) goes straight, but the light rays (P2) to (P5) that do not pass through the optical axis of the cap lens (13) are refracted by the cap lens (13). , Going outwards.

Therefore, the CCD camera (1) positioned in front of the measuring point member (10) and receiving the light ray (P1) that has passed through the optical axis of the cap lens (13) most strongly, has the LED light emitting section (12). Can be accurately detected, but the CCD camera (1), which is installed at a position forming a predetermined angle with respect to the measuring point member (10) and receives the light ray (P4) most strongly, is Since it is recognized that the LED light emitting part (12) of the measuring point member (10) is located on the extension line of (P4), that is, at the position of (P4 '), it is said that this misalignment leads to a measurement error. There was a problem.

[0013]

[Means for Solving the Problems]

 A self-illuminating measuring point member, which is used when the object to be measured is imaged by multiple CCD cameras and the three-dimensional dimensions of the object to be measured are obtained,

An LED light emitting part arranged in the center of the front surface of the stem, a cap lens attached to the front surface of the stem for the purpose of protecting the LED light emitting part and adjusting the luminous intensity distribution of the light emitted from the LED light emitting part, and a cap. It is composed of a modified lens arranged so as to cover the outer circumference of the lens,

In the optical system including the cap lens and the correction lens, the LED light emission unit is accurately positioned on the extension line of the light emitted from the LED light emission unit to the outside through the cap lens and the correction lens. Set to

A self-illuminating measuring point member, which is used when the object to be measured is imaged by a plurality of CCD cameras and the three-dimensional dimensions of the object to be measured are obtained,

It comprises an LED light emitting portion arranged in the center of the front surface of the stem and a protective lens or a protective cover for protecting the LED light emitting portion, which is arranged so as to cover the LED light emitting portion.

The protective lens or the protective cover is formed in a shape that does not have a lens action, and allows the light emitted from the LED light emitting portion to go straight without refracting.

[0019]

[Action]

 As described above, by arranging the lens cap and the correction lens on the front surface of the LED light emitting section, or by covering the front surface of the LED light emitting section with a protective lens or a protective cover having no lens action, The LED light emitting portion is accurately positioned on the extension line of the light beam radiated outward from the portion.

[0020]

【Example】

 FIG. 1 shows a first embodiment of a measuring point member (20) for optical measurement according to the present invention.

In the figure, (21) is a cylindrical stem, (22) is an LED light emitting part arranged in the center of the front surface of the stem (21), and (23) is an LED light emitting part (22). The cap lens is mounted on the front surface of the stem (21) for protection and for uniformly irradiating the light beam from the LED light emitting part (22) to the front of the light emitting part. The above-mentioned members are the same as the conventional ones.

Reference numeral (24) is a correction lens arranged outside the front surface of the stem (21) so as to cover the outer periphery of the cap lens (23).

The correction lens (24) refracts the light rays (P2) to (P5) refracted by the cap lens (23) again, thereby emitting LED light on the extension lines of the respective light rays (P2) to (P5). The refractive index of the lens is set so that the portion (22) is accurately positioned.

In the figure, (25) is a base for supporting the stem (21) and the correction lens (24), and a measurement point member (20) is provided on the bottom surface of the base (25). A fixing means, such as a magnet or an adhesive tape (not shown), for fixing it at a desired position is attached.

The measuring point member (20) configured as described above is arranged around the object to be measured (A) or on the object to be measured (A), and two or more CCD cameras (1) are provided. If the image is picked up, the position of the LED light emitting portion (22) of the measurement point member (20) can be accurately measured regardless of the positional relationship of each CCD camera (1) with respect to the measurement point member (20).

That is, all the light rays (P2) to (P5) emitted from the LED light emitting part (22) of the measuring point member (20) are corrected so that the LED light emitting part (22) is located on the extension line. Therefore, the LED light emitting section (22) recognized by the CCD camera (1), which is located in front of the measurement point member (20) and receives the light ray (P1) that has passed through the optical axis of the cap lens (23) most strongly, is recognized. ) And the measurement point member (20) at a predetermined angle, for example, the LED light emitting part (22) recognized by the CCD camera (1) that received the light beam (P4) most strongly. The position does not deviate, and the position of the LED light emitting part (22) of the measurement point member (20) can be accurately measured regardless of the angle of the image.

FIG. 2 shows a second embodiment of the measuring point member (20) according to the present invention.

The measurement point member (20) shown in this figure is such that the outer circumference of the LED light emitting part (22) arranged in the center of the front surface of the stem (21) is surrounded by a protective lens (30) made of a hemisphere. Therefore, the LED light emitting section (22) sets the positional relationship of each member so as to be accurately positioned at the center of the protective lens (30).

With this arrangement, the light beam emitted from the LED light emitting section (22) is not refracted by the protective lens (30) and goes straight in any direction, so that the CCD camera (1 When the measurement point member (20) is imaged by (4), the position of the LED light emitting part (22) does not shift even if the measurement point member (20) is imaged from any direction.

In this case, the protective lens (30) does not have a function of uniformly irradiating the light beam from the LED light emitting portion (22) toward the front of the light emitting portion, and the light is emitted from the LED light emitting portion (22). The luminous intensity distribution of the light rays is biased toward the center, but when the LED light emitting part (22) is used as a reference point for three-dimensional measurement by the CCD camera (1), the light distribution characteristics are particularly Since it is not important, the measurement will not be adversely affected even if the above effects disappear.

FIG. 3 shows a third embodiment of the measuring point member (20) according to the present invention.

In the measuring point member (20) shown in this figure, the outer periphery of the LED light emitting part (22) arranged in the center of the front surface of the stem (21) is covered with a transparent thin film-like protective cover (40). It is a thing.

In this way, if the LED light emitting part (22) is simply covered with the thin film-like protective cover (40), the direction in which the light beam emitted from the LED light emitting part (22) is directed However, since the CCD camera (1) images the measurement point member (20) as it is, the position of the LED light emitting part (22) is displaced no matter which direction the measurement point member (20) is imaged. There is no such thing.

FIG. 4 shows a fourth embodiment of the measuring point member (20) according to the present invention.

The measuring point member (20) shown in this figure has a hemispherical dome-shaped transparent protective cover (50) around the outer periphery of the LED light emitting part (22) arranged in the center of the front surface of the stem (21). The protective cover (50) has a uniform wall thickness at any portion, and has no lens effect.

As described above, by only covering the LED light emitting part (22) with the protective cover (50) having no lens action, the light beam emitted from the LED light emitting part (22) can be directed in any direction. As the CCD camera (1) takes an image of the measurement point member (20), the LED light emitting section (22) will not be displaced regardless of the direction in which the measurement point member (20) is imaged. .

[0037]

[Effect of the device]

 As described above, in the measuring point member according to the present invention, the lens cap and the correction lens are arranged on the front surface of the LED light emitting portion, or the front surface of the LED light emitting portion is protected lens or protective lens having no lens action. By covering with a cover, the LED light emitting part is accurately positioned on the extension line of the light beam emitted outward from the LED light emitting part.

Therefore, if the measuring point member according to the present invention is used as a reference point for absolute position determination of two or more CCD cameras with respect to objects to be measured, depending on the angle at which the measuring point member is imaged, Since the position of the light spot of the measurement point member does not shift, it is possible to perform accurate dimension measurement.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a measuring point member according to the present invention.

FIG. 2 is a side view showing a second embodiment of the measuring point member according to the present invention.

FIG. 3 is a side view showing a third embodiment of the measuring point member according to the present invention.

FIG. 4 is a side view showing a fourth embodiment of the measuring point member according to the present invention.

FIG. 5 is a perspective view showing a state in which an object to be measured is measured by two CCD cameras.

FIG. 6 is a perspective view showing a state when a light ray is incident on the CCD camera.

FIG. 7 is a side view showing a conventional measuring point member.

[Explanation of symbols]

 A DUT 1 CCD camera 20 Measurement point member 22 LED light emitting part 23 Cap lens 24 Correction lens 30 Protective lens 40 Protective cover 50 Protective cover

Claims (2)

[Scope of utility model registration request] 1. An LED light emitting section in which a self-illuminating measuring point member, which is used when the object to be measured is imaged by a plurality of CCD cameras and the three-dimensional dimensions of the object to be measured, is arranged in the center of the front surface of the stem. And a cap lens attached to the front surface of the stem for the purpose of protecting the LED light emitting part and adjusting the luminous intensity distribution of the light emitted from the LED light emitting part, and a correction lens arranged so as to cover the outer periphery of the cap lens. An optical system configured by the cap lens and the correction lens is formed on an extension line of a light beam emitted outward from the LED light emitting portion through the cap lens and the correction lens.
A measuring point member for optical measurement, wherein the LED light emitting portion is set so as to be accurately positioned. 2. An LED light emitting section in which a self-illuminating measuring point member, which is used when the object to be measured is imaged by a plurality of CCD cameras and the three-dimensional dimensions of the object to be measured are arranged in the center of the front surface of the stem. And a protective lens for protecting the LED light emitting portion, which is arranged so as to cover the LED light emitting portion, or a protective cover, which refracts the light emitted from the LED light emitting portion by the protective lens or the protective cover. A measuring point member for optical measurement, characterized in that the measuring point member is formed in a shape that does not have a lens action, and goes straight as it is.