JP2599454Y2 - Light source setting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination source setting device used for an inspection machine for inspecting the appearance of a soldered portion.

[0002]

2. Description of the Related Art Light-emitting diodes have long-term stability of light quantity,
Since it has an advantage of high-speed switching, it is often used as an illumination source for image processing. However, since one light emitting diode is a point light source, the amount of light is small, and a large number of light emitting diodes must be used simultaneously as an illumination source. At that time, the problem is that the light emitting diode is not a completely omni-directional light source. Therefore, when installing a large number of light emitting diodes in a dome shape, it is necessary to focus their optical axes at one point on the surface to be inspected. . Therefore, the conventional lighting device has a structure in which the mounting directions of the light emitting diodes are individually adjusted while viewing the image of the inspection surface.

[0003]

However, in the above-mentioned lighting device, the mounting direction of the light emitting diodes must be individually adjusted while viewing the image of the surface to be inspected. And the degree of convergence of those optical axes is poor.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an illumination source setting device which can eliminate the need for adjusting individual illumination sources, which has been a problem in the past, and improve the degree of convergence of their optical axes. .

[0005]

According to the present invention, a number of illumination sources are arranged on the surface of the virtual hemisphere toward the center of the bottom of the virtual hemisphere,
In an illumination device that focuses on the optical axes of all illumination sources, a number of annular jigs having different radii according to the height are arranged along the spherical surface of the virtual hemisphere and parallel to the reference plane at the bottom of the virtual hemisphere. A jig inclined surface for attachment having an inclination angle equal to the incident angle is formed on the inner peripheral surface of the annular jig, and an illumination source is attached to the jig inclined surface.

[0006]

When an illumination source is mounted on a jig inclined surface of a large number of annular jigs, for example, at the intersection of a virtual meridian and a virtual parallel on the surface of a virtual hemisphere, their optical axes are aligned with a surface to be inspected on a reference surface. At the center of the virtual hemisphere bottom. In addition, the annular jig can be processed in advance, and even when a plurality of lighting devices are manufactured, the same jig with the same accuracy can be achieved in a short time. Therefore, it is not necessary to adjust individual illumination sources, which has been a problem in the past, and the convergence of the optical axes can be improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, an illumination source setting device 1 according to the present embodiment is incorporated in an inspection machine 2. This inspection machine 2 performs an appearance inspection by image processing on the quality of a soldered portion formed when a lead wire of a discrete component is soldered to a conductive pad of a wiring board.

The illumination source setting device 1 arranges a large number of light emitting diodes 5 as an illumination source on the surface of the virtual hemisphere 22, for example, at the intersection of the graticules, toward the center O of the virtual hemisphere bottom. The optical axis 8 is focused on the center O, and all the light emitting diodes 5 on a certain virtual meridian
, Turning on all the light-emitting diodes 5 on a certain virtual latitude line, and turning on the light-emitting diodes 5 at a specific intersection group of these designated latitude lines. Enables illumination from any direction and performs various inspections under various illumination conditions.

The gist of the present invention is that, in the illumination source setting device 1, a large number of annular jigs 4 having different radii r according to the mounting height H of the light emitting diodes 5 are arranged along the spherical surface of the virtual hemisphere 22 and virtual. A jig inclined surface 3 for attachment having an inclination angle α equal to the incident angle i is formed on the inner peripheral surface of the annular jig 4. The structure is such that the light emitting diodes 5 are attached to the component inclined surface 3 at predetermined intervals.

That is, the virtual hemisphere 22 is a virtual hemisphere (dome) obtained by bisecting a sphere having a radius R on a plane passing through the center O. The light-emitting diodes 5 are equally arranged on a circumference having a radius r which decreases as the height H increases. These light-emitting diodes 5 are stacked in 14 stages, each stage has a maximum of 16 blocks, and a total of about 2,000 pieces are used. , A bottom surface 9 perpendicular to the optical axis 8.

The annular jig 4 is formed of acetal resin having high mechanical strength, and has one or more jig inclined surfaces 3 depending on the arrangement position, and is inclined with respect to the jig inclined surfaces 3. A jig mounting surface 21 forming an angle α, and on the upper and lower surfaces or on one surface of the inner peripheral portion of the plurality of annular illumination substrates 6 parallel to the reference surface 7 via the jig mounting surface 21. Fixed.

The light emitting diode 5 is fixed to the jig inclined surface 3 of the annular jig 4 with the bottom surface 9 in contact with the jig. The lead wire 12 passes through the wiring hole 13 in the annular jig 4. It is connected to the conductive pattern of the component hole 14 of the annular illumination board 6 by soldering. The annular lighting board 6 on which the light emitting diodes 5 are mounted via the annular jig 4 as described above.
Is formed, for example, in a tapered groove 1 of a split cylindrical body 16.
7 and is fixed by inserting a wedge 18 with bolts 19 therein, whereby the annular illumination substrate 6 is arranged in the cylindrical body 16 in parallel with the reference plane 7.

As shown in FIG. 2, a virtual hemisphere 2 having a radius R
When the height H is given to the light-emitting diode 5 fixed to the jig inclined surface 3 circumscribing the surface of the light-emitting diode 2, the radius r of the light-emitting diode 5 and the optical axis of the light-emitting diode 5 focused on the center O of the virtual hemisphere 22 8 and the incident angle i are determined. The inclination angle α of the jig inclined surface 3 with respect to the reference surface 7, that is, the jig mounting surface 21, forms an acute angle, and α = 9.
It is determined by the equation of 0 ° -θ and is equal to the incident angle i.

The upper surface of the uppermost annular jig 4 is covered with an annular cover 10. The opening 20 of the cylindrical body 16 is covered with a light-shielding cover 15. The inspection machine 2 (camera) is connected to the window 11 at the center of the cover 15.
The solder part to be inspected placed at the position of the center O is imaged.

Next, the operation of this embodiment will be described. When assembling the illumination source setting device 1, first, the annular jig 4 is attached in a state where the jig attachment surface 21 is in contact with both surfaces or one surface of the inner peripheral portion of the annular illumination substrate 6. Then, the annular jig 4
The light emitting diode 5 is fixed to the jig inclined surface 3 with the bottom surface 9 in contact therewith. An annular lighting board 6 to which the light emitting diode 5 is fixed via an annular jig 4 is arranged in a cylindrical body 16 via a wedge 18 and a bolt 19 in parallel with the reference plane 7.

As described above, when the light-emitting diodes 5 are attached to the jig inclined surfaces 3 of the large number of annular jigs 4 so as to coincide with the intersections of the virtual meridian and the virtual parallel on the surface of the virtual hemisphere 22,
These optical axes 8 can be focused at one point on the reference plane 7, that is, at the center O of the virtual hemisphere bottom. Therefore, if the soldering part to be inspected is placed at the position of the center O, the illumination light from all the light emitting diodes 5 is concentrated on the soldering part.

In addition, the annular jig 4 can be processed in advance, and even when manufacturing a plurality of lighting devices 1, it is possible to achieve the same accuracy in a short time. Therefore, it is not necessary to adjust each of the light emitting diodes 5 which has conventionally been a problem, and the convergence of the optical axis 8 can be improved. Various lighting conditions can be set by controlling the lighting state of the group of light emitting diodes 5.

[0018]

[Other Embodiments] In the above embodiment, 14 stages are stacked, and 16
Light-emitting diodes 5 using a total of about 2,000 blocks
However, the number of stages, the number of blocks in each stage, and the total count of the light emitting diodes 5 can be changed as necessary. Further, in the above-described embodiment, the case where the annular illumination substrate is arranged in the split cylinder is described.However, the invention is not limited thereto, and a stay may be provided in the housing, and the annular illumination substrate may be arranged via the stay. it can.

[0019]

[Effects of the Invention] As is apparent from the above description, the present invention has the following effects. That is, when the illumination source is attached to jig inclined surfaces of a large number of annular jigs, at the intersection of the virtual meridian and the virtual parallel of the virtual hemisphere surface,
These optical axes can be focused at one point on the surface to be inspected on the reference plane, that is, at the center of the virtual hemisphere bottom. In addition, the annular jig can be processed in advance, and even when a plurality of lighting devices are manufactured, the same jig with the same accuracy can be achieved in a short time. Therefore, it is not necessary to adjust individual illumination sources, which has been a problem in the past, and the convergence of the optical axes can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a lighting device according to an embodiment.

FIG. 2 is an enlarged cross-sectional view showing a part of the lighting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Illumination source setting apparatus 2 Inspection machine 3 Jig inclined surface 4 Annular jig 5 Light emitting diode (illumination source) 6 Annular illumination board 7 Reference plane 8 Optical axis 9 Bottom 10 Cover 11 Window 12 Lead wire 13 Wiring hole 14 Parts Hole 15 Cover 16 Cylindrical body 17 Tapered groove 18 Wedge 19 Bolt 20 Opening 21 Jig mounting surface 22 Virtual hemisphere O Center H Height R Radius r Radius α Incline angle θ angle i Incident angle

Continuation of the front page (56) References JP-A-5-231837 (JP, A) JP-A-3-218407 (JP, A) JP-A-60-25405 (JP, A) JP-A-4-212047 (JP) JP-A-5-52534 (JP, A) JP-A-5-226447 (JP, A) JP-A-5-45511 (JP, U) JP-A-6-78856 (JP, U) (58) Surveyed field (Int.Cl. ⁶ , DB name) G01N 21/84-21/91

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of illumination sources (5) are arranged on the surface of a virtual hemisphere (22) toward the center of the bottom of the virtual hemisphere, and are focused around the optical axes (8) of all the illumination sources (5). In the illumination device (1), a large number of annular jigs (4) having different radii (r) according to the height (H) are arranged along the spherical surface of the virtual hemisphere (22) and at the reference surface (7) at the bottom of the virtual hemisphere. ), And a jig inclined surface (3) for attachment having an inclination angle (α) equal to the incident angle (i) is formed on the inner peripheral surface of the annular jig (4). The illumination source (5) is attached to the jig inclined surface (3).
An illumination source setting device (1), characterized in that: