KR0180803B1 - Illuminating apparatus & assembling and inspecting apparatus of electronic parts using thereof - Google Patents

Abstract

An inner light guide having a cylindrical structure made of a transparent material; An outer light guide positioned outside the inner light guide and protruding from an end of the inner light guide and having a cylindrical structure made of a transparent material; And a plurality of light sources positioned respectively at the proximal ends of the inner and outer light guides and incident light into the respective light guides through their proximal end surfaces, and each distal end of the inner and outer light guides is formed on an outer circumferential side thereof. The illumination device which forms a tapered inclined surface toward the side, and emits light emitted from the light sources and transmitted through the light guides toward the center of the light guides, includes a plurality of transparent cylindrical light guides and a plurality of light guides. By using the light source, it is possible to increase the irradiation area or prevent luminance unevenness and always perform a satisfactory imaging under optimum conditions without being influenced by the surface state or shape of the object to be illuminated.

Description

Assembly and inspection device for lighting devices and electronic parts using them

1 is a schematic explanatory diagram of a device for assembling / inspecting an electronic component incorporating a lighting device according to an embodiment of the present invention.

2 is a schematic plan view showing an arrangement example of a light source in the lighting apparatus of the present invention.

Fig. 3A is a plan view of the outer light guide used in the present invention.

3B is a longitudinal sectional view of the outer light guide used in the present invention.

4A is a plan view of the inner light guide used in the present invention.

4B is a longitudinal sectional view of the inner light guide used in the present invention.

5 is a view for explaining an example of the light emission situation in the inner and outer light guides.

6 (a) to 6 (e) illustrate some examples of light incidence, transmission, and emission in the inner light guide.

* Explanation of symbols for main parts of the drawings

1: lighting device 2: bracket

3: long hole 4: stop screw

5: Assembly / inspection apparatus of electronic component 6: Printed board

7: camera 8: outer support link

9: outside light guide 9a: inclined surface

11: inner support link 12: inner light guide

12a: slope 13,14: light source

15,16: brightness control device 17,18: switching device

19: image processing device 20: control device

TECHNICAL FIELD This invention relates to the technique effective for application to an assembly and inspection apparatus, such as an illumination device and the electronic component using the same.

[Prior art]

For example, when electronic components such as ICs or chip resistors or capacitors are mounted and assembled on an electronic circuit formed on a printed board, work is automatically performed using an electronic component mounting apparatus called chip mounting. It is customary to do it.

In the above case, an operation is performed while imaging or recognizing the electronic component, the electronic circuit of the printed circuit board of the mounting line, etc. using a CCD camera imaging device.

In addition, an illumination device is used to satisfactorily image and recognize an electronic component or an electronic circuit for the above operation.

Such lighting devices are used for the same purpose in inspection devices such as electronic components.

By the way, as an example of such an illumination device, it is proposed to illuminate the printed board | substrate to be illuminated by a single illumination means and a light source.

However, when illuminating with a single illuminating means, since the surface state of the target printed board is very diverse, it is very difficult to cope with the whole substrate with a single illuminating means, and the direct reflection of the light source is harmful, and vice versa. In some cases, it is difficult to identify the mark without using the contrast of.

In the case of a diffused light source, there is also a case where the use of the direct reflected light is effective and a case where the diffused reflected light is effective.

There is no specification behind the fiducial mark generally used for this kind of identification mark, and at present it is required to adapt to various kinds and various states.

Therefore, it is desirable that the light source has a large area and no luminance unevenness, and that the irradiation angle to the object and the brightness can be arbitrarily set during the mounting operation.

An object of the present invention is to provide a lighting apparatus that can perform imaging or recognition more accurately, even if conditions such as the surface state of the object varies.

Further, another object of the present invention is to provide an assembly and inspection apparatus for an electronic component or the like using an illumination device capable of satisfactorily imaging or recognizing an electronic component or an electronic circuit which is an example of an object.

The above and its objects and novel features of the present invention will be apparent from the description and the accompanying drawings of this specification.

[Means for solving the problem]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

That is, the lighting apparatus of the present invention uses a plurality of cylindrical light guides each made of a transparent material, injects light into the bases of the plurality of light guides, and emits light propagated in accordance with the total reflection phenomenon. It exits from the tip and surveys the target area at an angle.

The tip of the outer light guide protrudes forward from the tip of the inner light guide, and the tip of each light guide is formed as a tapered inclined surface from the outer circumference side toward the tip of the inner circumference side, and is emitted from a plurality of light sources Light transmitted through the light guide is emitted toward the center of each light guide.

The light guide is easy to manufacture, has a low cost, and preferably has a cylindrical structure. For example, the light guide can be made of an acrylic resin material.

The plurality of light sources may be made of, for example, light emitting diodes, and may be switched on and off for each light guide depending on the object to be illuminated, and the light emission intensity of the light emitting diodes may be variably adjusted.

[Action]

According to the above-described lighting apparatus of the present invention, the light emitted from the plurality of light sources is transmitted while being reflected in the total reflection phenomenon in each light guide, and is emitted from the inclined surface of the tip to the illuminated portion.

At this time, the light emission luminous intensity or brightness of the light source can be variably adjusted according to the state of the illumination object, the light source can be controlled on / off for each light guide, and the position of the light guide can be changed according to the illumination object.

Therefore, it is possible to always perform illumination at the optimum condition according to the state of the to-be-illuminated part.

EXAMPLE

1 is a schematic explanatory diagram of an assembly / inspection apparatus for an electronic component using the lighting apparatus according to the present invention, and FIG. 2 is a schematic plan view showing an arrangement example of a light source in the lighting apparatus of the present invention, and FIG. a) is a plan view of the outer light guide used in this invention, (b) of FIG. 3 is a longitudinal cross-sectional view of the outer light guide used for this invention, and (a) of FIG. 4 is an inner light guide used for this invention. Fig. 4B is a longitudinal sectional view of the inner light guide used in the present invention, and Fig. 5 is a view for explaining an example of the light emission situation in the inner and outer light guides. (e) is a figure explaining some examples of light incidence, transmission, and emission in the inner light guide.

In this embodiment, the lighting device 1 is connected to the assembly / inspection device 5 of the electronic component according to the long hole 3 formed in the bracket 2 and the stop screw 4 inserted through the long hole 3. The position adjustment in the axial direction to the height direction is possible.

As the electronic component assembly / inspection apparatus 5, for example, an electronic component mounting apparatus and an electronic component inspection apparatus called so-called chip mounting are considered, but not limited to the above, in the embodiment of the present invention, Used for selection.

In the downward direction of the lighting device 1, a printed board 6 is positioned as an example of an object to be illuminated, and on this printed board 6, an electronic circuit (not shown) is used as a printed wiring for mounting electronic components. Formed.

On the other hand, a camera 7, which is an imaging device constituting a part of the assembly / inspection device 5 of the electronic component, is disposed above the lighting device 1, and the camera 7 includes an electronic circuit on the printed circuit board 6. The mounted electronic parts and the like can be picked up and recognized according to image processing.

The lighting device 1 has an outer light guide 9 supported by an outer support link 8 mounted on the bracket 2 and an inner light supported by an inner support link 11 mounted on the bracket 2 in the same way. A plurality of guides 12 and upwardly arranged at a slight distance from the base end surfaces of the respective light guides 9 and 12 (in the embodiment of the present invention, as shown in FIG. Light emitting diodes (LED) of light emitting diodes (LEDs).

Both light guides 9 and 12 have a transparent cylindrical structure made of an acrylic resin material (see FIGS. 3 and 4). Therefore, the light emitted from the light sources 13 and 14 and incident into the center of each of the light guides 9 and 12 is transmitted from the tip by transmitting the inside of the light guides 9 and 12 according to a so-called total reflection phenomenon.

In addition, the camera 7 may capture the image to be illuminated through the inner cylindrical space of the inner light guide 12.

The tip of the outer light guide 9 is the same as the tip of the inner light guide 12 or protrudes forward than the tip of the inner light guide 12.

In addition, the tip of each light guide 9, 12 has a structure in which the inclined surfaces 9a and 12a were formed in the taper shape from the outer peripheral side toward the inner peripheral side. As a result, the light emitted from the inclined surfaces 9a and 12a at the tip of each light guide 9 or 12 is directed toward the center direction.

In this embodiment, the inclined surface 9a of the outer light guide 9 forms an inclination angle of about 63.4 ± 0.5 degrees with respect to the front end surface (the surface perpendicular to the axis line).

Incidentally, the inclined surface 12a of the inner light guide 12 of this embodiment has an inclination angle of about 26.6 ± 0.1 degrees with respect to the front end surface (the surface perpendicular to the axis line).

Therefore, in this embodiment, in addition to the respective lengths of the outer light guide 9 and the inner light guide 12, the inclination angles of the inclined surfaces 9a and 12a are different from each other, and the positions with respect to the printed board 6 as the illumination object. Can be variably adjusted as the long hole 3 and the stop screw 4, the light emitted from each of the light guides 9 and 12 is irradiated to the illuminated portion at different irradiation angles.

In addition, each light source 13, 14 is respectively provided to the brightness adjusting device 15, 16 (e.g., an adjustment volume) so as to arbitrarily variably adjust the luminous intensity or the brightness of the light emission according to the state of the illuminated area. Connected.

In addition, the light sources 13 and 14 are also connected to switching devices 17 and 18 (for example, switching switches) for switching on and off, respectively, in accordance with the state of the part to be illuminated.

Hereinafter, with reference to the accompanying drawings will be described the operation of the embodiment of the present invention.

First, the height of the illumination object 1, that is, the printed circuit board 6, is adjusted to the height required as the long hole 3 and the stop screw 4, and is set.

When the light sources 13 and 14 are turned on and turned on, the light emitted from each of the light sources 13 and 14 is incident on the proximal end surfaces of the outer and inner light guides 9 and 12, respectively, and is transmitted in the axial direction to the front end. As shown in FIG. 5 in each of the inclined surfaces 9a and 12a, it is emitted toward the center direction and irradiated to the illuminated portion of the printed board 6.

At this time, the illumination light incident to the center of each of the light guides 9 and 12 is partially reflected to the inner side or the outer side of the light guides 9 and 12 according to the total reflection phenomenon and is emitted from the inclined surfaces 9a and 12a. .

The transmission state of the illumination light in the center of each of the light guides 9 and 12 at this time is shown as an example of the inner light guide 12 in (a) to (e) of FIG.

That is, (a) of FIG. 6 shows an example of the illumination light that passes directly in the axial direction of the inner light guide 12, and (b) and (c) are examples of the illumination light that is totally reflected once to the outer and inner surfaces, respectively. (D) and (e) show the example of the illumination light totally reflected by the outer side and the inner side once, and totally twice.

In any of the examples, the illumination light emitted from the inclined surface 12a at the tip end is refracted according to the difference in refractive index between the resin material of the inner light guide 12 and the air and is emitted in the air.

Illumination light emitted from each of the light guides 9 and 12 is directed toward the center and is irradiated to an illuminated area such as an electronic circuit on the printed board 6.

At this time, since the illumination light emitted from each of the light guides 9 and 12 is irradiated at different irradiation angles, even when a shadow or a halation occurs due to, for example, the shape or color of the illumination object, two ( Or by using two or more light guides 9 and 12, the respective illumination lights advantageously interact with each other to prevent the occurrence of shadows or halation with each other.

As a result, in this embodiment, the image of the object to be illuminated can be accurately captured by the camera. The imaging result is image processed by the image processing apparatus 19 to achieve accurate recognition of the object, and the automatic control of the assembly / inspection apparatus 15 or the like is performed according to the control apparatus 20 based on the recognition result. .

Further, by adjusting the brightness adjusting devices 15 and 16 according to the state (shape or color) of the object to be illuminated, the brightness or brightness of the illumination light emitted from the light sources 13 and 14 is optimally variably adjusted, and the clear image is good. Imaging can be made easily.

Further, depending on the object to be illuminated, accurate imaging may be performed only by the illumination light emitted from either light source 13 or 14 rather than the illumination light emitted from both light sources 13 and 14.

Therefore, in this case, illumination can be performed while the on / off control of each of the light sources 13 and 14 in accordance with the switching devices 17 and 18, so that better imaging can be performed.

According to such conditions as the shape of the illumination object and the surface state, various usage conditions such as the light sources 13 and 14 of the lighting device 1 are ditched and stored in a computer prior to the automatic mounting operation. It is possible to accurately perform automatic mounting of electronic components while performing imaging by the camera 7 in the state.

As mentioned above, although the invention made | formed by the present inventor was demonstrated concretely based on the Example, this invention is not limited to the said Example, It can implement in a range which does not deviate from the summary, and is changeable.

For example, the number of light sources, the number of light guides, the inclination angle of the tip thereof, or the material or shape of the light guide can also be set and used.

In the above description, the case in which the invention according to the embodiment of the present invention is mainly applied to the assembly and inspection technology of the electronic component, which is the field of use thereof, has been described. However, the present invention is not limited thereto. It is possible.

As described above, the effects of the exemplary embodiment of the present invention will be described.

(1) By using a plurality of transparent cylindrical light guides and a plurality of light sources, the irradiation area is increased or luminance unevenness is prevented without being influenced by the surface state or shape of the object to be illuminated, and always in good condition. Imaging can be performed.

(2) By appropriately selecting the length of the light guide and the inclination angle of the tip, imaging can be always performed under optimum conditions.

(3) The brightness of the light source with respect to each light guide can be variably adjusted, or bidirectional or on / off control of one side can be performed to perform an optimal imaging according to the conditions of the illumination object.

(4) By constructing the light guide in a cylindrical structure, the structure is easy and inexpensive as compared with other shapes, which is convenient because ordinary transparent pipes and the like can also be used.

(5) By constructing the light guide from a resin material such as acrylic, it is possible to manufacture a product having the required quality at low cost.

(6) Since the position of the light guide can be variably adjusted in the axial direction with respect to the illumination object, optimal imaging can always be performed.

(7) By making the angles of the inclined surfaces of the respective tips of the respective light guides different from each other, the irradiation area and the irradiation angle of the illumination light to the object can be improved or balanced.

(8) According to the above (1) to (7), it is possible to accurately mount or inspect the electronic component in accordance with good image pickup or image processing and recognition resulting therefrom.

Claims (9)

An inner light guide having a cylindrical structure made of a transparent material; An outer light guide positioned outside the inner light guide and protruding from a tip of the inner light guide and having a cylindrical structure made of a transparent material; Each of which is located at the proximal end of the inner and outer light guides, and emits light into the respective light guides through its proximal end surfaces, each end of the inner and outer light guides having an inner circumference at the outer circumferential side; And a tapered inclined surface toward the side, and emits light emitted from the light sources and transmitted through the light guides toward the center of the light guides. The illuminating device of claim 1, wherein the inner and outer light guides have a cylindrical structure. The illuminating device according to claim 1, wherein the light source is made of a light emitting diode, and the light emitting intensity of the light emitting diode is set to be variable. The illuminating device according to claim 1, wherein the light source is switched on and off for each of the inner and outer light guides according to an object to be illuminated. The illuminating device according to claim 1, wherein the inner and outer light guides are made of a resin material such as acrylic. The illumination device according to claim 1, wherein the positions of the inner and outer light guides with respect to the illumination object are variably adjusted in the axial direction. The illuminating device according to claim 1, wherein the angles of the inclined surfaces of the tips of the inner and outer light guides are set differently. An inner light guide having a cylindrical structure made of a transparent material; An outer light guide positioned outside the inner light guide and protruding from an inner side of the inner light guide and having a cylindrical structure made of a transparent material; A plurality of light sources respectively provided at base ends of the inner and outer light guides and emitting light into the respective light guides through the base ends; The camera is installed in an upper direction of the light source and recognizes an object to be illuminated through the inner spaces of the inner and outer light guides, and each tip of the inner and outer light guides has a tapered shape from the outer circumferential side toward the inner circumferential side. And the light emitted from the light source and transmitted through each of the light guides is emitted toward the center of the light guides. The assembly / inspection apparatus according to claim 8, wherein the illumination object is made of a printed board for mounting an electronic component, and the camera is installed in the electronic component mounting apparatus.