JP3109825U - Ring lighting device - Google Patents

Abstract

Provided is a ring illumination device capable of performing an inspection without replacing the illumination device even when there is a plurality of inspection sites on one inspection object.
A light emitting diode (3) is attached to a flat and donut-shaped substrate (2) horizontally attached to a holding frame (1) so that its optical axis is orthogonal to the substrate, and a plurality of light emitting diodes are mounted. Between the predetermined row on the inner peripheral side of the row and the predetermined row on the outer peripheral side, a reverse trumpet-shaped first reflector 4 having a reflecting mirror on the inner side is arranged, and the outer side of the predetermined row on the outer peripheral side is the first An inverted trumpet-shaped second reflector 5 having a tilt angle different from the tilt angle of one reflector and having an inner side as a reflector is arranged. Further, the lower end of the second reflecting plate extends in the direction of the inspection object from the lower end of the first reflecting plate.
[Selection] Figure 1

Description

  The present invention relates to a ring illumination device for illuminating an inspected object when inspecting an inspected object (product, etc.) on a factory production line with an image processing type measuring machine equipped with a CCD camera, In particular, the present invention relates to a ring illumination device in which a plurality of light emitting diodes (hereinafter referred to as LEDs) are used as a light source, and a plurality of LEDs are arranged in a ring shape to provide direct illumination.

  Ring illumination devices in which LEDs are arranged in a plurality of rows in a ring shape are widely used in the inspection process of electronic components such as semiconductor chips, drinking cans, and other industrial manufactured products. As one method of use, a ring illumination device is disposed above the object to be inspected, and light from the LED is directly irradiated onto the object to be inspected. Then, an object to be inspected is imaged using a CCD camera disposed above the ring illumination device, and inspected by performing image processing with an image processing type measuring machine.

  The ring illumination device is arranged in a ring shape on the inner surface of a printed circuit board in which LEDs are processed into a truncated cone shape so as to concentrate and illuminate the inspection site of the inspection object, and the optical axis of each LED is the inspection object It is aligned and attached so as to face. In addition, when the inspection site of the object to be inspected is located at two locations above and below, the inspection site is inspected for each inspection site using a ring illumination device suitable for the site.

  Furthermore, it is necessary to change the irradiation angle from the LED depending on the type, size, or inspection site of the inspection object. Therefore, a plurality of ring illumination devices in which the inclination angle of the LED mounting surface is changed are required. In addition, an illumination device according to the size of the object to be inspected is required, and as a result, another type of ring illumination device is required.

   On the other hand, as shown in Patent Document 1, a printed circuit board on which a large number of LEDs are mounted holds an annular printed circuit board having a notch in a planar state, solders the terminals of the LED, and then removes the notched part. It is configured in a truncated cone shape by attracting both ends and bonding and fixing.

  Another method is to attach the LEDs to the substrate at different inclination angles for each ring so that the emitted light from all the LEDs arranged in a ring shape is directed onto the object to be inspected as shown in Patent Document 2. Yes.

Japanese Patent Laid-Open No. 10-21729 JP-A-10-54940

  All the LEDs in the conventional ring illumination device are attached to the substrate so as to concentrate and irradiate the irradiation target point on a certain inspection site on the axis passing through the central hole of the holding frame. Therefore, when there are two inspection parts in one inspection object, the illumination device is replaced for each inspection part part, which is an inefficient inspection work. Moreover, for each inspection object to be inspected, it is necessary to use a ring illumination device having a different LED irradiation target point, resulting in poor inspection work efficiency. In addition, it is necessary to have another type of lighting device for replacement, and maintenance and inspection of the lighting device are troublesome.

  Furthermore, the conventional ring illumination device is often manufactured by the method shown in Patent Document 1. That is, since the printed circuit board is forcibly bent into a truncated conical shape after the LED terminals are soldered, a crack occurs in the soldering portion during the bending process, causing a contact failure.

  Furthermore, the ring illumination device of Patent Document 2 does not cause the problem of Patent Document 1, but all LEDs must be tilted and attached to the substrate, and it is necessary to maintain a different tilt angle for each annular shape. The irradiation direction of the LED could not be kept constant.

  The present invention is intended to solve such problems of the prior art, and the object is to illuminate even if there is a plurality of inspection sites on one inspection object. The present invention provides a ring illumination device that can perform an inspection without replacing the device. Further, there is provided an on-ring illumination device in which a substrate to which an LED is attached is not processed into a truncated cone shape, and is attached to a flat substrate with its optical axis orthogonal.

  In order to achieve the above object, the present invention comprises a planar and donut-like substrate mounted horizontally on a holding frame as a light source with a plurality of LEDs arranged in a plurality of rows in a ring shape. A ring illumination device for illuminating, wherein an LED is mounted with its optical axis orthogonal to the substrate, and an inner side is provided between a predetermined row on the inner peripheral side and a predetermined row on the outer peripheral side of the plurality of LEDs. A reverse-wrapper-shaped first reflecting plate that is a reflecting mirror is disposed at a predetermined angle with respect to the optical axis of the LED, and the outer side of the predetermined row on the outer peripheral side is inclined smaller than the tilting angle of the first reflecting mirror. An inverted trumpet-shaped second reflecting plate having an angle and having a reflecting mirror on the inside is arranged.

According to a second aspect of the present invention, the lower end of the second reflecting plate extends in the direction of the inspection object from the lower end of the first reflecting plate.
According to a third aspect of the present invention, LEDs having different emission colors are arranged in the predetermined row on the inner peripheral side and the predetermined column on the outer peripheral side.

  With the configuration described in claim 1, different inspection sites can be illuminated simultaneously by one ring illumination device, and the inspection work efficiency can be improved. Also, since the LED is mounted orthogonally to the substrate, there is no cracking in the soldered part caused by forcibly bending the substrate after soldering and mounting the LED terminals as in the past, and there is no electrical contact failure There are effects such as no.

According to the second aspect, since the irradiation from the LEDs in the outer peripheral row is reduced by the first reflecting plate, the examination site can be reliably illuminated.
According to the third aspect of the present invention, when there is a case where it is better to change the illumination color depending on the examination site, an optimum ring illumination device is obtained.

  Hereinafter, an embodiment of the ring illumination device of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a ring illumination device of the present invention, and FIG. 2 is a plan view of an LED serving as a light source of the ring illumination device of the present invention and a donut-shaped substrate to which the LED is mounted. Is shown. FIG. 3 is a partially sectional side view of the first reflector used in the present invention, FIG. 4 is a top view of FIG. 3, and FIG. 5 is an enlarged sectional view of the main part of the second reflector used in the present invention. FIG. 6 is a top view before forming the first reflecting plate or the second reflecting plate.

  The ring illumination device L of the present invention includes a holding frame 1 configured in a donut shape when viewed from above, a donut-shaped substrate 2 attached horizontally inside the holding frame 1, and a plurality of LEDs 3a, 3b, 3c- Are arranged in a ring shape in a plurality of rows, a reverse reflector-shaped first reflector 4 arranged between a predetermined row on the inner peripheral side and a predetermined row on the outer peripheral side of the plurality of LEDs, and the outer peripheral side And a second reflector 5 having an inverted trumpet shape arranged outside the predetermined row.

  The holding frame 1 includes a donut-shaped top plate 1a made of aluminum or synthetic resin, and a cylindrical side frame 1b made of the same material as the top plate screwed to the outer periphery of the top plate 1a. Yes. The lower surface of the top plate 1a is formed in a concave section 1c, and the light source 3 and the power supply cable 7 penetrating the cylindrical side frame 1b are connected in the concave section 1c.

  The light source 3 is configured by arranging a plurality of LEDs 3a, 3b, 3c on the substrate 2 in a ring shape in five rows. Between the three rows on the inner circumference side and the two rows on the outer circumference side among the five rows, as shown in FIGS. 1 and 2, a ring-shaped band-like region 8 where no LED exists is provided, and the first reflector 4 is provided here. A small hole 9 for screwing is formed.

  The LEDs 3a, 3b, 3c-- are soldered to the printed wiring provided on the back surface of the substrate with the terminals penetrating the substrate 2, and are supplied with power from the power supply cable 7. The light emitting portions of the LEDs 3a, 3b, 3c-- are attached perpendicular to the substrate.

  The substrate 2 is positioned at the inner and outer peripheral edges of the recess 1c so as to close the recess 1c of the top plate 1a, and then the shoulder and the recess of the cylindrical side frame 1b when the cylindrical side frame 1b is screwed to the top plate 1a. The light source 3 is attached to the holding frame 1 by being sandwiched between the outer periphery of 1c.

  As shown in FIGS. 3 and 4, the reverse trumpet-shaped first reflector 4 is fixed by welding a ring rod 4 a having an attachment hole 4 b at the upper end portion. The reflecting plate 4 is formed by cutting an aluminum or iron plate into a horseshoe shape 10 shown in FIG. Mirror surface. Then, the first reflector 4 is attached to the back surface of the substrate 2 with screws 11 in the ring-shaped band 8 of the substrate 2 using the small holes 9 and the attachment holes 4b. That is, the first reflecting plate 4 is disposed between a predetermined row on the inner peripheral side and a predetermined row on the outer peripheral side of the plurality of rows of LEDs. The inclination angle of the first reflecting plate 4 is designed to be about 30 degrees with respect to the optical axis of the LED.

  The second reflecting plate substrate 5 is made of the same material and means as the first reflecting plate 4 and, as shown in FIG. 5, a ring rod 5a having a mounting hole 5b at the lower end edge is fixed by welding. . The ring rod 5a is brought into contact with the lower end surface of the cylindrical side frame 1b, and the second reflector 5 is attached to the lower end surface of the cylindrical side frame 1b through the mounting hole 5b. It arrange | positions on the outer side of the predetermined | prescribed row | line | column on the outer peripheral side. The inclination angle of the second reflecting plate 5 is designed to be about 15 degrees with respect to the optical axis of the LED.

  Accordingly, the light emitted from the LEDs 3a, 3b, 3c-- is reflected by the first reflector 4 and the second reflector 5 to illuminate the object to be inspected under the ring illumination device, but the first reflection. The light from the LEDs 3a, 3b, 3c on the inner peripheral row side reflected by the plate 4 mainly illuminates the inspection region above the object to be inspected, while the LEDs 3d, 3e on the outer peripheral row side reflected by the second reflecting plate 5 are used. The light from the light mainly illuminates the inspection site of the object to be inspected, and different inspection sites can be illuminated by one ring illumination device.

  In addition, since the lower end of the second reflecting plate extends from the lower end of the first reflecting plate in the direction of the object to be inspected, the irradiation from the LEDs in the outer circumferential row is less likely to be blocked by the first reflecting plate, thereby ensuring the inspection site. Can be illuminated.

Any of the above-described embodiments is merely an example of the present invention, and it is obvious that modifications and changes as appropriate are included in the scope of the claims of the present application. For example, the first and second reflectors may be made of a mirror-finished aluminum plate by pressing, or a synthetic resin may be molded and the inner surface may be subjected to chemical plating. Furthermore, since the irradiation position can be changed by using a reflecting plate with a different inclination angle, it is possible to inspect other types of inspection objects.
Moreover, it can illuminate with the color which matched the test | inspection site | part by changing the luminescent color of LED by the side of the outer periphery row divided by the 1st reflecting plate.

The longitudinal cross-sectional view which shows this invention ring illuminating device. The plan view of the LED and the substrate that are the light source of the ring illumination device of the present invention shows about 1/4 of the whole. The side view which carried out the partial cross section of the 1st reflecting plate used for this invention. FIG. 4 is a top view of FIG. 3. The principal part expanded sectional view of the 2nd reflecting plate used for this invention. It is a top view before forming a 1st reflecting plate or a 2nd reflecting plate.

Explanation of symbols

L-ring illumination device 1 Holding frame 1a Top plate 1b Cylindrical side frame 2 Substrate 3 Light sources 3a, 3b, 3c, --- Light emitting diode (LED)
4 First reflector 5 Second reflector

Claims (3)

A ring illumination device for illuminating an object to be inspected, comprising a plurality of light emitting diodes arranged in a plurality of rows in a ring shape on a planar and donut-shaped substrate mounted horizontally on a holding frame, the light emitting device A diode is mounted with its optical axis orthogonal to the substrate, and a reverse-wrapper-like shape with a reflecting mirror on the inner side between a predetermined row on the inner peripheral side and a predetermined row on the outer peripheral side of a plurality of rows of light emitting diodes. The first reflector is disposed at a predetermined angle with respect to the optical axis of the light emitting diode, and the outer side of the predetermined row on the outer peripheral side has an inclination angle smaller than the inclination angle of the first reflecting mirror, A ring illuminator characterized in that an inverted trumpet-shaped second reflector plate having a reflecting mirror is disposed. The ring illumination device according to claim 1, wherein a lower end of the second reflecting plate extends in a direction of an inspection object from a lower end of the first reflecting plate. 2. The ring illumination device according to claim 1, wherein light emitting diodes having different emission colors are arranged in the inner circumferential side predetermined row and the outer circumferential side predetermined row.

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