JPH0720551U - Lighting source setting device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to improve the focusing degree of the optical axis of an illumination device by eliminating the need for adjustment of individual illumination sources, which has been a problem in the past. In the illumination source setting device 1 in which a large number of light emitting diodes 5 are arranged on the surface of the virtual hemisphere 22 toward the center of the bottom of the virtual hemisphere and the optical axes 8 of all the illumination sources 5 are focused, the height H A large number of annular jigs 4 having different radius r according to
Are provided along the spherical surface of the virtual hemisphere 22 and in a state of being parallel to the reference surface 7 of the virtual hemisphere bottom. For mounting the inner peripheral surface of the annular jig 4 at an inclination angle α equal to the incident angle i. The jig inclined surface 3 is formed, and the illumination source 5 is attached to the jig inclined surface 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an illumination source setting device used in, for example, an inspection machine that visually inspects the quality of a soldered portion.

[0002]

[Prior art]

 Light emitting diodes are widely used as illumination sources for image processing because they have the advantages of long-term stability of light intensity and fast switching. However, since one light emitting diode is a point light source, the amount of light is small, and as a lighting source, a large number of light emitting diodes must be used at the same time. In that case, the problem is that the light emitting diode is not a completely omnidirectional light source, so when installing many 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 direction of the light emitting diodes is individually adjusted while observing the image of the surface to be inspected.

[0003]

[Problems to be solved by the device]

 However, in the illuminating device, it is necessary to individually adjust the mounting direction of the light emitting diodes while observing the image of the surface to be inspected. Therefore, it takes a long time to adjust each light emitting diode, and the optical axes thereof are not adjusted. There was a problem that the degree of converging was poor.

[0004]

[The purpose of the device]

 An object of the present invention is to provide an illumination source setting device capable of improving the degree of focusing of the optical axes of the illumination sources, which does not require adjustment of individual illumination sources.

[0005]

[Means for Solving the Problems]

 The present invention is a lighting device in which a large number of illumination sources are arranged on the surface of a virtual hemisphere toward the center of the bottom of the virtual hemisphere, and focusing is performed around the optical axes of all the illumination sources. A large number of annular jigs are provided along the spherical surface of the virtual hemisphere and parallel to the reference surface of the bottom of the virtual hemisphere, and the inner peripheral surface of this annular jig is for mounting at an inclination angle equal to the incident angle. The jig inclined surface is formed and the illumination source is attached to the jig inclined surface.

[0006]

[Action]

 When an illumination source is attached to the jig inclined surface of a large number of annular jigs, for example, at the intersections of the virtual meridians and virtual latitudes on the surface of the virtual hemisphere, their optical axes are set to 1 of the test surface on the reference surface. It can be focused at a point, ie the center of the virtual hemisphere base. Further, the annular jig can be processed in advance, and it is possible to achieve the same accuracy in a short time even when manufacturing a plurality of lighting devices. Therefore, it is possible to improve the focusing degree of the optical axes of the illumination sources, which does not require the adjustment of individual illumination sources.

[0007]

【Example】

 As shown in FIGS. 1 and 2, the illumination source setting device 1 according to the present embodiment is incorporated in the inspection machine 2. The inspector 2 is a device for visual inspection of the quality of a soldering portion formed when a lead wire of a discrete component is soldered to a conductive pad of a wiring board by image processing.

In the illumination source setting device 1, on the surface of the virtual hemisphere 22, for example, a large number of light emitting diodes 5 as illumination sources are arranged toward the center O of the virtual hemisphere bottom at intersections of the graticules, and all the light emitting diodes 5 are arranged. The optical axis 8 is focused on the center O, the designation for turning on all the light emitting diodes 5 on a certain virtual meridian, the designation for turning on all the light emitting diodes 5 on a certain virtual parallel, and these By giving a designation to turn on the light emitting diode 5 of a specific intersection group of designated latitude and longitude lines, it is possible to illuminate from various directions with various luminous fluxes and perform various inspections under various illumination conditions.

The gist of the present invention is to arrange a large number of annular jigs 4 having different radii r along the spherical surface of the virtual hemisphere 22 according to the mounting height H of the light emitting diode 5 in the illumination source setting device 1. , And is provided in parallel with the reference plane 7 of the virtual hemispherical bottom, and the jig inclination 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 jig inclined surface 3 at predetermined intervals.

That is, the virtual hemisphere 22 is an imaginary hemisphere (dome) obtained by dividing a sphere having a radius R in a plane passing through the center O. The light emitting diodes 5 are evenly arranged on the circumference of a radius r which becomes smaller as the height H increases, and these light emitting diodes 5 are stacked in 14 stages, each stage has a maximum of 16 blocks, and a total of about 2000. It is used individually and has 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 a plurality of jig inclined surfaces 3 depending on the arrangement position and the jig inclined surface 3. A jig mounting surface 21 having an inclination angle α, and upper and lower surfaces or one surface of the inner peripheral portion of the plurality of annular illumination boards 6 parallel to the reference surface 7 via the jig mounting surface 21. It is fixed to.

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 therewith, and the lead wire 12 thereof is connected to 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 outer peripheral portion of the annular illumination board 6 to which the light emitting diode 5 is thus attached via the annular jig 4 is inserted into, for example, the taper groove 17 of the cylindrical body 16 which is divided into two, and the wedge 18 is inserted into this with the bolt 19. As a result, the structure is fixed, and thus the annular illumination substrate 6 is arranged in the cylindrical body 16 in parallel with the reference plane 7.

As shown in FIG. 2, when the height H is given to the light emitting diode 5 fixed to the jig inclined surface 3 circumscribing the surface of the virtual hemisphere 22 having the radius R, the radius r of the light emitting diode 5 and The angle θ formed by the optical axis 8 of the light emitting diode 5 focused on the center O of the virtual hemisphere 22 with respect to the reference plane 7 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 attachment surface 21 is an acute angle, is determined by the equation α = 90 ° −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. Then, the inspection machine 2 (camera) images the solder portion to be inspected placed at the position of the center O from the window 11 at the center of the cover 15.

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

As described above, when the light emitting diodes 5 are attached to the jig inclined surfaces 3 of the plurality of annular jigs 4 so as to coincide with the intersections of the virtual meridians and virtual latitudes on the surface of the virtual hemisphere 22, the optical axes thereof are 8 can be focused on one point on the reference plane 7, that is, the center O of the virtual hemisphere bottom. Therefore, if the soldered portion to be inspected is placed at the position of the center O, the illumination light from all the light emitting diodes 5 will be concentrated on the soldered portion.

In addition, the annular jig 4 can be processed in advance, and even when a plurality of lighting devices 1 are manufactured, the same accuracy can be achieved in a short time. Therefore, it is possible to improve the focusing degree of the optical axes 8 of the light emitting diodes 5 without the need for adjusting the individual light emitting diodes 5, which has been a problem in the past. Various lighting conditions can be set by controlling the lighting state of the light emitting diodes 5 group.

[0018]

Other Embodiments In the above embodiment, the case where the light emitting diode 5 is used in which 14 stages are stacked, 16 blocks are used in each stage, and a total of about 2000 pieces are used, but the number of stages and the number of blocks of each stage are not limited to this. The total count of the light emitting diodes 5 can be changed as needed. Further, in the above-mentioned embodiment, the case where the annular illumination board is arranged in the halved cylindrical body has been described, but not limited to this, a stay may be provided in the housing, and the annular illumination board may be arranged via this stay. it can.

[0019]

[Effect of device]

 As is clear from the above description, according to the present invention, the following effects can be obtained. That is, when the illumination sources are attached to the jig inclined surfaces of many annular jigs at the intersections of the virtual meridians and virtual latitudes on the surface of the virtual hemisphere, their optical axes will be examined on the reference plane. It can be focused at one point on the surface, that is, the center of the virtual hemisphere bottom. Further, the annular jig can be processed in advance, and it is possible to achieve the same accuracy in a short time even when manufacturing a plurality of lighting devices. Therefore, it is possible to improve the focusing degree of the optical axes of the illumination sources, which does not require the adjustment of individual illumination sources.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an illumination device according to an embodiment.

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

[Explanation of symbols]

 1 Illumination source setting device 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 Inclination angle θ angle i Incident angle

Claims (1)

[Scope of utility model registration request] 1. A number 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 axis (8) of all the illumination sources (5). In the illuminating device (1), a large number of annular jigs (4) having different radii (r) according to the height (H) are provided along the spherical surface of the virtual hemisphere (22) and at the reference plane (7) of the virtual hemisphere bottom. ), And a jig inclined surface (3) for mounting 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) on the jig inclined surface (3)
An illumination source setting device (1), characterized in that: