WO2001098706A1

WO2001098706A1 - Illuminator

Info

Publication number: WO2001098706A1
Application number: PCT/JP2001/005156
Authority: WO
Inventors: Kenji Yoneda
Original assignee: Ccs Inc.
Priority date: 2000-06-20
Filing date: 2001-06-15
Publication date: 2001-12-27
Also published as: JP2002008410A; AU2001264304A1

Abstract

An inexpensive illuminator comprising light-emitting diodes prevented from failing because of the heat of a soldering iron, having a small size, emitting an increased intensity of light, and assembled easily. A large number of light emitters (6) the emitting faces (6A) of which are directed forward are arranged on an annular substrate (5) having an opening (5K) near the center. A Fresnel (7) lens adapted for focusing the light from each emitter (6) having an opening (7K) the size of which is approximately the same of that of the opening (5K) is disposed in contact with or near the emitting faces (6A) of the emitters (6).

Description

Specification

Technical field

The present invention relates to an illuminating device that is used, for example, when irradiating a product with light to inspect the appearance and scratches of the product such as a substrate in a factory or the like, or when mounting electronic components or the like on the substrate. Background art

The lighting device shown in FIG. 4 is used as the lighting device. This is done by inserting a light emitting diode (LED) 32 into each of a large number of holes 31 formed in a substantially arc-shaped aluminum mounting base 30 shown in the figure and fixing them with a silicone adhesive. The wiring work is performed by soldering a wiring wire to the terminal of the light emitting diode 32.

Then, by concentrating the optical axis 32B of the light emitting diode 32 of the completed lighting device at one point of the irradiation object H, the light emitted from all the light emitting diodes 32 is concentrated and the light amount is increased. , So that reliable inspections can be performed. It should be noted that the macro lens 2 of the CCD camera 1 as shown in the figure is inserted into a hole 30 A formed inside the boss formed in the center of the mounting table 30, and an image is captured and inspection is performed. In addition, the inspection is performed by visual inspection through the hole 3OA.

Since the mounting base 30 must be provided with a large number of holes 31 with different angles with high precision, not only the processing cost for the mounting base 30 is high, but also the entire device is formed by the arc shape. There was a problem that the size was increased in the direction of penetration of the hole 30A. In addition, a light-emitting diode (LED) 32 is inserted into each of the large number of holes 31 and fixed with a silicon adhesive, and a wiring work for soldering the terminals of each light-emitting diode 32 is performed. Therefore, a lot of work time was required, and the assembly cost was extremely high. In addition, during the wiring work, the heat of the soldering iron is applied to the light emitting diode 32 more than necessary, which causes a problem that the light emitting diode 32 is defective.

In order to concentrate the optical axis 32B of the light emitting diode 32 mounted on the mounting base 30 formed in an arc shape, the light emitting diode 32 must be arranged only on a concentric circle. However, it was difficult to arrange the light emitting diodes on adjacent concentric circles without any gaps, and there was a problem that the light amount could not be increased as desired.

In view of the above situation, the present invention seeks to solve the problem not only to avoid the failure of the light emitting diode due to the heat of the soldering iron, but also to reduce the size of the device and increase the amount of light. Another object of the present invention is to provide a lighting device which is inexpensive and easy to assemble. Disclosure of the invention

In order to solve the above-described problems, the lighting device of the present invention spreads a large number of luminous bodies on an annular substrate having an opening formed substantially at the center in a state where an irradiation surface faces forward. A Fresnel lens that collects the irradiation light to be irradiated and has an opening having substantially the same size as the opening is in contact with or close to the irradiation surface of the luminous body.

By irradiating the light emitted from each illuminant with the Fresnel lens that is in contact with or close to the illuminated surface of the illuminant as described above, a large number of illuminants can be It can be mounted (spread) with the mounting position, that is, with the irradiation surface facing forward (substantially perpendicular to the surface of the substrate). Since the light emitter can be directly attached to the substrate, wiring work for the light emitting diode as in the conventional case can be eliminated. In addition, since the substrate is flat and a thin Fresnel lens is used, the size of the device in the direction in which the holes penetrate can be reduced. Since the Fresnel lens is easy to process, it can be easily made into a square or perforated. Further, since the mounting position and the mounting angle of the luminous bodies are not restricted as in the related art, it becomes possible to arrange the adjacent luminous bodies in a dense state. By setting the size of the aperture provided in the substrate and the Fresnel lens to a size that can pass through the macro lens of the CCD camera, the image can be visually observed through the hole and the image captured by the CCD camera can be processed. Then, it is projected on a monitor and the like, and inspection and mounting of electronic components can be performed.

By arranging a plurality of rows of luminous bodies arranged in a straight line with respect to the substrate, and arranging the luminous bodies in a staggered manner such that the centers of the luminous bodies adjacent to each other are different, The luminous bodies can be arranged in a dense state in which a gap generated between them is minimized.

By dividing the surface of the substrate into two by a dividing straight line passing through the center thereof, and arranging the luminous body in each of the two divided parts symmetrically with the dividing straight line interposed therebetween. , Design is easier.

The use of a light emitting diode as the light emitter is advantageous in terms of power consumption and heat generation as compared with a halogen lamp. In addition, the light emitting diode can be used stably because the light amount does not greatly change over time unlike a halogen lamp. Further, the life of the halogen lamp is short, and the life of the light-emitting diode is remarkably long, and the deterioration speed is slow, although the life of the light-emitting diode is inferior with time. Further, the light emitting diode is strong in switching operation, and can easily perform instantaneous ON-OFF of light in a strobe-like manner. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view showing a state in which a Mac aperture lens of a CCD camera is inserted into the center of the lighting device.

FIG. 2 is a front view of the lighting device.

FIG. 3 is a cross-sectional view of the lighting device.

FIG. 4 is a sectional view of a conventional lighting device. BEST MODE FOR CARRYING OUT THE INVENTION

1 to 3 show the lighting device of the present invention. This lighting device A casing 3 having an open box shape and having a circular opening 3 A formed at the center of the upper end and having a size in which the macro lens 2 of the CCD camera 1 can be inserted, and inside the casing 3. And a light source 4 provided in the camera. The power supply to the light source 4 is performed via a power cable (not shown) connected to the substrate 5 described later. The illuminating device is suitable not only for inspecting products such as substrates in factories and inspection rooms, but also for mounting electronic components on the substrates, but may be used for other purposes. . An image obtained through the macro lens 2 of the CCD camera 1 inserted into the opening 3A may be image-processed and displayed on a monitor or the like, or may be visually observed from the opening 3A. Although not shown, the illuminating device is supported in the state shown in FIG. 1 through another supporting member ゃ dedicated supporting member.

The light source 4 has a square outer shape, and an irradiation surface 6A is directed forward on a ring-shaped substrate 5 having a circular opening 5K formed at the center where the macro lens 2 can be inserted. A large number of light emitting diodes (LEDs) 6 as light emitters are laid out in the same posture in a state (a state perpendicular to the surface 5A of the substrate 5 or a state substantially perpendicular to the surface 5A of the substrate 5). The irradiation light to be irradiated is focused, and one Fresnel lens 7 having a circular opening 7 K having the same size as the opening 5 K is brought into contact with the irradiation surface 6 A of the light emitting diode 6. Arranged in the state immediately before (in the figure, it looks like they are in contact, but they are not actually in contact), and the optical axis 6 B of the light emitting diode 6 is passed through the Fresnel lens 7 to one point of the irradiation object H. The light can be collected. By setting the irradiation angle of the light emitting diode 9 to about 1 °, very intense light can be obtained, but if the irradiation angle is 10 ° or less, the irradiation angle is set to more than 10 °. There is an advantage that the amount of emitted light can be increased as compared with the case of performing the above.

The Fresnel lens 7 has a circular outer shape, and is formed by cutting a Fresnel lens produced by cutting a ring-shaped groove into a square so as to fit in the casing 1, and the opening 7K is formed. As shown in the figure, the shape (including the size) of the Fresnel lens 7 is not limited to the shape shown in the figure. May be. In the figure, the Fresnel lens 7 was placed just before contacting the irradiation surface 6A of the light emitting diode 6, but was placed in contact with it. Alternatively, the Fresnel lens 7 may be arranged close to the irradiation surface 6A of the light emitting diode 6 with a gap between them so as not to hinder the reception of light. In the case of this close arrangement, the heat of the light emitting diode 6 is not directly transmitted when it is brought into contact, which is advantageous in the heat resistance of the Fresnel lens 7. The Fresnel lens 7 is preferably made of a heat-resistant resin or the like, but may not necessarily be made of a heat-resistant material depending on the number of the light-emitting diodes 6 and the like.

The substrate 5 has the same shape (substantially square as viewed from the front) and the same size as the Fresnel lens 7, but the shape and size of a substantially circular, polygonal, or elliptical shape as viewed from the front are as follows. It can be changed freely. In addition, the substrate 5 is arranged in a horizontal (horizontal) posture in which the surface 5A thereof is oriented in a horizontal direction. However, the substrate 5 is arranged in a vertical (vertical) posture in which the surface is oriented vertically, or in an oblique posture. You may.

FIG. 1 and FIG. 3 show the board 5 which is arranged in a straight line in the horizontal direction, passes through the lead wires 6R of the light emitting diode 6, and is soldered.

As shown in FIG. 1, the light emitting diode 6 has a lead wire 6R extending perpendicularly to the substrate 5, and as shown in FIG. The upper and lower (vertical) divisions of the figure are divided into two. The same number (87) on both sides of the dividing line 8 and the light emitting diodes 6 are regularly installed at symmetrical positions. Four (any number of) light emitting diodes 6 are attached. As shown in FIG. 2, as shown in FIG. 2, a large number of rows a and b of a group of light-emitting diodes 6 arranged in a straight line in the vertical direction of FIG. ,… (Actually, there are 8 rows, but only 3 rows are numbered), and the light emitting diodes 6 are arranged in a zigzag pattern so that the center position of each light emitting diode 6 is different in the horizontal direction of the figure. The gap between 6 is minimized. 2M shown in FIG. 2 indicates a groove located at the outermost periphery among a plurality of annular grooves of the Fresnel lens 7. The mounting position of the light emitting diode 6 is not limited to the position shown in FIG. 2, but may be another arrangement.

The light emitting diodes 6 may be constituted by light emitting diodes of the same color or light emitting diodes of a plurality of colors. In addition, 9 shown in FIG. A spacer serving also as a mounting member is provided at four corners for mounting the substrate 5 at an interval, and 10 is a light emitting diode between which the Fresnel lens 7 is mounted and the substrate 5 is provided. It is a spacer that also serves as a mounting member and is located at the four corners to secure the storage space for 6. The specific configuration of these spacers 9, 10 is not limited to the one shown in the figure. Industrial applicability

According to the present invention, by irradiating the light emitted from each illuminant with a Fresnel lens that is in contact with or close to the illuminated surface of the illuminant, a special mounting base as in the related art can be provided. Not only can the structure be unnecessary and inexpensive, but also a large number of light emitters can be mounted on the substrate in the same mounting posture, so that the mounting operation can be performed easily and quickly. In addition, since the mounting position and mounting angle of the luminous bodies are not restricted as in the conventional case, it is possible to arrange the luminous bodies adjacent to each other in a dense state, thereby increasing the spectral amount. The lighting device can emit more intense light. In addition, since the light-emitting body can be directly attached to the substrate, wiring work for the light-emitting diode as in the related art can be eliminated, and the light-emitting diode does not become defective due to the heat of the soldering iron. Further, since the substrate is flat and a thin Fresnel lens is used, the size of the device in the direction in which the holes penetrate can be reduced, and the size of the entire device can be reduced. Further, the Fresnel lens is easy to process, so that it can be easily formed into a square or perforated, which is advantageous in terms of manufacturing.

According to the present invention, by setting the size of the opening provided in the substrate and the Fresnel lens to a size that can pass through the macro lens of the CCD camera, the image captured by the CCD camera can be processed. Can be projected on a monitor, etc., so that, for example, scratches that are overlooked by the naked eye or scratches at a location that is difficult to see with the naked eye can be reliably detected, and there is an advantage that electronic components can be easily mounted. . According to the present invention, a plurality of rows of light emitter groups arranged in a straight line with respect to a substrate are arranged, and the light emitters are arranged in a staggered manner so that the center positions of the light emitters adjacent to each other are different. This makes it possible to arrange the light emitters in a dense state in which a gap generated between the light emitters is minimized, and it is possible to increase the spectral amount.

According to the present invention, the surface of the substrate is divided into two by a dividing straight line passing through the center of the substrate, and the light emitting body is symmetrically placed on each of the two divided parts with the dividing straight line interposed therebetween. By arranging, design becomes easier and the degree of freedom in design can be increased.

According to the present invention, the use of a light emitting diode as a light emitter is advantageous in terms of power consumption and heat generation as compared with a halogen lamp, and is advantageous in terms of use. In addition, the light emitting diode can be used stably because the light quantity does not greatly change with the passage of time unlike an octogen lamp. In addition, halogen lamps have a short life and deteriorate with time and become darker, but the life of the light emitting diode is dramatically longer and the deterioration speed is slower, which is advantageous in terms of use. Further, the light-emitting diode is strong in switching operation, and can easily perform strobe-like light ON-OFF, which is not possible with a halogen lamp, thereby saving power.

Claims

The scope of the claims

1. A large number of luminous bodies are spread on an annular substrate having an opening formed substantially at the center, with the irradiation surface facing forward, and the irradiation light emitted from each of the luminous bodies is condensed. A lighting device comprising: a Fresnel lens having an opening having substantially the same size as that of the luminous body in contact with or close to an irradiation surface of the light emitting body.

2. The illumination device according to claim 1, wherein the size of the aperture provided in the substrate and the Fresnel lens is set to a size that allows the aperture of the aperture lens of the CCD camera.

3. A request comprising arranging a plurality of rows of luminous bodies arranged in a straight line with respect to the substrate, and arranging the luminous bodies in a staggered manner such that the centers of the luminous bodies adjacent to each other are different. Item 2. The lighting device according to item 1 or 2.

4. The surface of the substrate is divided into two by a dividing straight line passing through the center of the substrate, and the luminous body is arranged in each of the two divided portions in a state of being symmetrical with the dividing straight line interposed therebetween. The lighting device according to claim 1.

5. The lighting device according to any one of claims 1 to 4, wherein a light emitting diode is used as the light emitting body.