JPS62168037A - Object detector - Google Patents

Abstract

PURPOSE:To accurately detect only an object on a printed board by arranging a light source and an image pickup device so that the optical axis of projection light and the optical axis of the image pickup device cross each other on the surface of the body. CONSTITUTION:The projection light which is outputted by a light source 13, passed through a fiber cable 1, and projected from a convex lens 17 passes through an optical axis O1 slanted at an angle theta1 to a perpendicular and focused on the body such as an electric component 12 on the printed board 11. The image pickup device 18 whose optical axis O2 is slanted at an angle theta2 to the perpendicular and crosses the optical axis O1 of the projection light on the electric component 12 photodetects reflected light from the electric component 12 and converts optical information obtained by the photodetection into a video signal to detect whether the electric component is present or not.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an object detection device that detects an object by converting optical information from reflected light reflected from an object into a video signal.

Overview> The present invention provides an object detection device (in which the optical axis of projection light projected onto the surface of an object from a light source and the optical axis of an imaging device that receives reflected light from the object are connected to the object). The present invention provides a device that can detect objects more accurately by arranging a light source and an imaging device so that they intersect on a surface.

<Prior Art> The object detection device according to the present invention can be used, for example, to detect whether an electrical component placed on a printed circuit board is placed at a predetermined position. In the conventional device, as shown in FIG. 6, a light source lamp 1 illuminates a printed circuit board 2, and a shadow 5 of an electrical component 3 placed on the printed circuit board 1 is imaged by a CCD camera or the like. By detecting it with the device 4, the presence of the gas component 3 was confirmed.

Problems to be solved by this invention However, with the above-mentioned conventional device, it is difficult to accurately place electrical components when the distance between components is narrow or when there is a hole on the printed circuit board in a shaded area. There is a risk that it will not be detected.

The present invention was devised in view of the above-mentioned drawbacks of the conventional device. In a device that detects the presence or absence of an object by converting optical information obtained by receiving light into a video signal (C), the light source is arranged such that the optical axis of the projected light and the optical axis of the imaging device intersect on the surface of the object. The present invention provides an object detection device in which an imaging device is arranged.

Effect> Therefore, according to the present invention, only objects on the printed circuit board can be accurately detected.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the attached drawings. ○ Figure 1 is a block diagram showing an example of the object detection device of the present invention, 11 is a printed circuit board, 12 is a block diagram. An electrical component as an article placed on this printed circuit board 11, 13 is a light source, and a large number of optical fibers 14 are emitted from the light source 13.
A fiber cable 14 is led out.

The cable 14 is inserted and stored at its tip into a holder 15 having a slit-shaped storage opening 16 as shown in FIG. There is.

The holder 15 is located at its tip, that is, the printed circuit board 11
A convex lens 17 is housed in the end facing the holder 15), and the projection light from the fiber cable 14 outputted from the fiber cable 16 is stored in the holder 15. By taking an angle θ1 with respect to the vertical line, the beam is configured to be irradiated onto the electrical component 12 from an oblique direction and brought into focus.

Reference numeral 18 denotes an imaging device such as a COD camera, which is installed on the opposite side of the holder 15 with respect to the vertical line, and its optical axis 02 is set at an angle θ2 (angle θ2) with respect to the vertical line.
(equal to 1) is in a tilted state.

Since the present invention is constructed as described above, the projection light outputted from the light source 13 and projected onto the convex lens 17 via the fiber cable 14 passes through the optical axis 01 and has a height of l.
is focused on the electrical component 12 of.

On the other hand, the optical axis 02 of the above projection light is set on the electrical component 12.
The imaging device 18 intersecting with the electrical component 12 receives the reflected light reflected on the electrical component 12, converts the optical information obtained by the received light into a video signal, and detects the presence or absence of the electrical component.

The present invention is configured as described above, but as another example,
As shown in FIGS. 3 and 4, the projection light O is irradiated onto the electrical component 12 with a predetermined width m, and the difference in height of the electrical component 12 (
J+n range).

In addition, as shown in FIG. 5, convex lenses 17' and 17'' are provided on the printed circuit board 11 in parallel in the radial direction, and the light i'!1ltIOi of one convex lens 17' is
crosses the optical axis O on the electric component 12', and the optical axis O''2 of the other convex lens 17'' crosses the optical axis O on the electric component 12'.
An imaging device 18 is provided so as to intersect the two. in this way,
(by providing a convex lens and an imaging device) electrical components 12' of different heights.

12” can be detected.

Effect> Since the present invention is configured as described above, the projected light is focused on the object and the reflected light of the projected light is read by the imaging device, so the object can be detected accurately. This is an excellent idea that can be used.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the object detection device according to the present invention, Fig. 2 is a cross-sectional view of a main part of a holder provided in the same device, and Fig. 3 is a diagram showing another embodiment of the present invention. FIG. 4 is a diagram showing the state of light projected onto an object in another embodiment, FIG. 5 is a diagram showing the configuration of a further embodiment of the present invention, and FIG. 6 is a schematic diagram of the configuration. FIG. 1 is a configuration diagram showing a conventional object detection device. 12: Electrical component, 13: Light source, 18: Imaging device.

Claims (1)

[Claims] 1. The presence or absence of an object is detected by receiving the reflected light from the object of the projection light output from the light source with an imaging device and converting the optical information obtained by this light reception into a video signal. An object detection device comprising: the light source and the imaging device arranged so that the optical axis of the projection light and the optical axis of the imaging device intersect on the surface of the object.