WO2006123421A1

WO2006123421A1 - Lighting device

Info

Publication number: WO2006123421A1
Application number: PCT/JP2005/009247
Authority: WO
Inventors: Masatoshi Sasai
Original assignee: Mega Trade Corp
Priority date: 2005-05-20
Filing date: 2005-05-20
Publication date: 2006-11-23
Also published as: JPWO2006123421A1; JP4383483B2

Abstract

A lighting device where, even if the inner diameter of a bracket is reduced, light can be efficiently condensed at the central portion of the bracket and a lighting board can be efficiently installed without detailed work. A lighting device (100) for irradiating a to-be-inspected object (7) with light from a plurality of directions has a lighting board (1) for holding LEDs (11) and has a semicylinder-like bracket (3) for holding the lighting board (1). Through-holes (30) for receiving the LEDs (11) are provided in a semicylinder-shaped outer side face of the bracket (3), and are each set to a size where a light emission section of an LED (11) is substantially in intimate contact with the through-hole (30). The lighting board (1) is pressed against the bracket (3) with the LEDs (11) received in the through-holes (30), leg terminals of the LEDs (11) are bent, and the optical axes of the LEDs (11) are oriented toward the center of the bracket (3).

Description

Specification

Lighting device

Technical field

The present invention relates to a lighting device used when inspecting an inspection object such as a printed circuit board.

Background art

In general, the formation state of pads, resists, and the like on a printed circuit board is inspected by a substrate inspection apparatus. This board inspection device includes an illumination device that irradiates light on the surface of a printed circuit board and a light receiving device that receives the reflected light. The illumination device also detects irregularities and scratches on the inspection object. It is configured to irradiate light from an obliquely fixed direction that can be accurately inspected. By the way, the inventor of the present application proposes an illumination device having a single bracket as a device for making the optical axis direction constant in the illumination device (Patent Document 1).

[0003] The illumination device described in Patent Document 1 is such that an illumination substrate having LED groups is always attached to a printed circuit board at a certain angle. As shown in FIG. A single bracket 90 having a mounting angle of: a reinforcing member 91 mounted on the upper side of the bracket 90, and a lighting board 92 mounted on the reinforcing member 91. In FIG. 6, the two films shown below the bracket 90 indicate a plastic member and an anisotropic diffusion film.

[0004] The assembly process of the lighting device will be described. First, a side wall member 94 is prepared, a semicircular arc bracket 90 is fixed to the inside of the side wall member 94 with a screw, and an upper surface thereof is made of aluminum or the like. A vertically long reinforcing member 91 is attached. Since the bracket 90 has a semi-polygonal shape, a flat portion is formed on the outer peripheral portion thereof, and a reinforcing member 91 can be attached to the flat portion. The reinforcing member 91 prevents the illumination board 92 from being squeezed, and has a plurality of through holes 91a for accommodating the LEDs 92 in the inner part thereof. When attaching the lighting board 92, the reinforcing member 91 is fixed to the bracket 90, and the LED 93 is accommodated in the through hole 91a of the reinforcing member 91. Secure the plate 92. With this configuration, if the mounting position of the bracket 90 is accurate, the mounting angle of the lighting board 92 can be reproducible and the inspection performance can be improved. .

Patent Document 1: Japanese Patent No. 3639837

Disclosure of the invention

Problems to be solved by the invention

[0005] However, such a lighting device has the following problems. That is, since the illumination board having the LED group as described above has an elongated flat shape, when the radius of the semicircular bracket is reduced, as shown in FIG. In extreme cases, only 2 or 3 lighting boards can be attached to the bracket. If the number of mounted illumination boards is reduced in this way, the optical axes of all LEDs cannot be directed to the center position of the bracket, resulting in poor light collection efficiency. Of course, such an illumination substrate itself may be formed in an arc shape, but it is difficult to obtain an arc-shaped illumination substrate.

[0006] In addition, when attaching an illumination board with the illumination device as described above, a process of first attaching a reinforcement member to the bracket and then attaching the illumination board from above the reinforcement member is employed. With this configuration, the work of attaching the reinforcing member and the work of attaching the lighting board are required, and time is required for the work.

[0007] Therefore, the present invention focuses on the above-mentioned problem, and even when the radial force of the bracket is short, the light can be efficiently condensed at the center position. An object of the present invention is to provide a lighting device that can be attached to the lighting device.

Means for solving the problem

[0008] In order to solve the above-described problems, the present invention provides a lighting device that irradiates a target object with a plurality of directional force lights, and holds the lighting substrate on which a plurality of light emitting members are arranged, and the lighting substrate. And a semi-cylindrical bracket for providing a through hole for accommodating the light emitting members arranged on the substrate on the outer side surface of the bracket, and the substrate in a state where the light emitting member is accommodated in the through hole. Is to be held by the bracket.

[0009] With this configuration, even when the radius of the bracket is reduced, the semi-cylindrical shape The light of the light emitting member can be directed toward the center through the through hole provided in the side surface of the bracket in the center direction, so that the light can be efficiently collected. Since the bracket has a semi-cylindrical shape so that the entire lighting board can be placed, it is possible to easily attach the lighting board without the need to attach a reinforcing member to the bracket.

[0010] Preferably, the light emitting member is substantially inscribed in the inner wall surface with the through hole provided in the bracket facing the semi-cylindrical center position.

[0011] With this configuration, for example, when the light emitting member SLED is configured, all the LEDs are brought into contact with the wall surface of the through hole by inserting the LED into the through hole. This makes it possible to orient the optical axis toward the center and improve the light collection efficiency.

[0012] Further, the height of the light emitting member with respect to such an illumination board is adjusted so that the height of the light emitting member becomes an arc shape, that is, the arc shape of the bracket when attached to the bracket. Attach so that it is in place.

[0013] With this configuration, even if the radius of the bracket is reduced, the height of each LED on the illumination board is an arc shape that matches the arc shape of the bracket. The distance between the center position and each LED can be kept constant, and the uneven lighting can be reduced to / J.

The invention's effect

[0014] In the present invention, in an illuminating device that irradiates light to an irradiation object from a plurality of directions, an illumination substrate on which a plurality of light emitting members are arranged, and a semi-cylindrical bracket for holding the illumination substrate A through hole for accommodating the light emitting members arranged on the substrate is provided on the outer side surface of the bracket, and the substrate is held by the bracket in a state where the light emitting member is accommodated in the through hole. Therefore, even if the radius of the bracket is reduced, the optical axis of the light emitting member can be directed in the central direction through the through hole in the central direction provided on the side surface of the semi-cylindrical bracket. Can be collected efficiently. Also, since the bracket has a semi-cylindrical shape so that the entire illumination board can be placed, it is possible to simplify the work of attaching the illumination board without the need to attach a reinforcing member to the bracket. Brief Description of Drawings

FIG. 1 is a schematic diagram of a lighting device according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of a lighting device in the same form.

FIG. 3 is a schematic bottom view of the bracket of the lighting device in FIG. 1.

[Fig. 4] Fig. 4 is a side view of the illumination board in the same form and a diagram showing a state where it is attached to a bracket.

FIG. 5 is an assembled perspective view showing a state in which the illumination board in the same form is attached to the bracket.

FIG. 6 is a diagram showing an outline of a lighting device in a conventional example.

FIG. 7 is a state diagram when the radius of the bracket in the conventional example is reduced.

Explanation of symbols

1 ... Lighting board

2 "• Anisotropic diffuser

3 ... 'Bracket

4 ... 'Cover body

5 ·· Support

6. Line sensor

7 ", inspection object

lO- "substrate

ll- •• LED

12 ··· Connector mounting part

20 .. Anisotropic diffusion film

21 ··· Plastic materials

30 ... Through hole

31 ··· Connection openings

40 ··· Spacer

41 ··· Opening 51 · · · Side openings

100 · · · Lighting equipment

101 · · · Board inspection equipment

BEST MODE FOR CARRYING OUT THE INVENTION

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

[0018] The illuminating device 100 according to this embodiment is incorporated in the substrate inspection apparatus 101. As shown in FIG. 2 and FIG. A semi-cylindrical bracket 3 that is mounted across the side, an elongated linear flat lighting board 1 that is detachably attached to the upper surface of the bracket 3, an LED 11 arranged on the lighting board 1, and the LED 11 Among these lights, a line sensor 6 which is a light receiving device for receiving light reflected by the inspection object 7 is provided. Hereinafter, the specific configuration of the lighting device 100 will be described in detail.

As shown in FIG. 4 and the like, each of the lighting boards 1 attached to the lighting device 100 includes a board 10 on which a plurality of LEDs 11 as point light sources are mounted, and a LED 11 attached to the board 10. Composed. The substrate 10 is configured in a straight plane, for example, so that the dimension in the short direction is about 1 cm to 2 cm, and the dimension in the longitudinal direction is about 40 cm to 50 cm. The LEDs 11 are attached to the substrate 10 so as to form a plurality of rows along the longitudinal direction. The LEDs 11 are staggered, that is, LEDs 11 in adjacent rows are arranged between the LEDs 11 in the same row, and the force is attached with the two leg terminals buoyant on the substrate 10. When this LED 11 is attached, each LED 11 has its lower end at the center position in the short direction of the board 10, and the force is set to a height position along the arc of the bracket 3 to be described later. It is attached. These LEDs 11 have the same color in the column direction, and adjacent columns have different hues. In this embodiment, four rows of LEDs 11 of a red LED 11, a green LED 11, a red LED 11, and a green LED 11 are arranged in a staggered manner. Such an LED 11 is connected to a connector mounting portion 12 provided on the substrate 10, and lighting, extinction, light amount adjustment, and the like are controlled by a control portion (not shown) via a connector connected thereto. This control is performed for each lighting board 1, and each lighting board 1 also has each control. This is also done for each row and every predetermined number of LEDs along the length (eg every 10).

On the other hand, the bracket 3 is formed in a substantially semi-cylindrical shape so that the illumination board 1 can be placed on the outer side surface thereof, and a plurality of through holes 30 that can accommodate the LEDs 11 are formed on the side surface portion. Provided. The central axis of the through hole 30 is set to face the center position of the bracket 3. The thickness dimension of the bracket 3 is set to a dimension that can completely accommodate the LED 11, and the inner diameter dimension of the through hole 30 is such that the light emitting portion of the LED 11 can be almost inscribed. The dimension is set. In the vicinity of the left and right ends of the bracket 3, screw holes for attaching a plurality of illumination boards 1 along the cylindrical outer side surface are provided, and the illumination board 1 is attached to the bracket 3 by attaching screws to the screw holes. It can be attached to. In this embodiment, six flat plate-like lighting boards 1 are mounted symmetrically on the outer side surface of the bracket 3 provided in a semi-cylindrical shape, but this number may be changed as appropriate. Can do. As for the mounting position of the illumination board 1, the mounting position of the lighting board 1 may be appropriately set as long as the LED 11 can be accommodated in the through hole 30.

[0021] In the central portion of the bracket 3, a slit S is provided along the width direction. This slit S is for guiding the light reflected from the inspection object 7 out of the light emitted from the LED 11 to the line sensor 6 side, and is set to a size corresponding to the size of the line sensor 6. It is done.

A cover body 4 is attached to the bracket 3 on the outside with the illumination board 1 interposed therebetween. This cover body 4 is composed of a thin metal plate that covers the outside of the illumination board 1 and is provided with an opening 41 corresponding to the slit S in the upper part so that dust or the like does not adhere to the illumination board 1 or the like. . The cover body 4 is attached in a state where a spacer 40 is attached to the bracket 3 and a clearance with the illumination board 1 is secured by the spacer 40.

On the other hand, an anisotropic diffusion member 2 as shown in FIG. 5 is attached to the inner side surface of the bracket 3. This anisotropic diffusion member 2 is configured by attaching an anisotropic diffusion film 21 to the lower surface side of a transparent plastic member 20, and the light emitted from the LED 11 is irradiated in the longitudinal direction of the anisotropic diffusion film 21. To spread. In this embodiment, the anisotropic diffusion film 21 diffuses the input linear light in the longitudinal direction, for example, at about 40 degrees, and Diffuses about 5 degrees in the short direction. If this anisotropic diffusion member 2 is used, the minute scratches formed on the inspection object 7 can be made inconspicuous, and therefore the shape of the inspection object 7 can be inspected with the minute scratches removed. In such a case, the anisotropic diffusion member 2 is attached and inspected. On the other hand, when inspecting the presence of minute scratches in detail, the anisotropic diffusion member 2 is removed and inspected. A connection opening 31 for exposing the connector mounting portion 12 of the illumination board 1 is provided on the inner side surface of the bracket 3. Normally, such a connector mounting portion 12 is provided on the outer portion of the lighting board 1, but if it is provided on the outer portion of the lighting board 1 in this way, the bulge is increased in the outer direction and interferes with the line sensor 6. There is a possibility. Therefore, in this embodiment, the connector is attached to the inner force of the bracket 3 so that the line sensor 6 can be as close as possible.

Then, the bracket 3 and the illumination board 1 configured as described above are fixed to an apparatus main body (not shown) by a support 5. The support 5 is configured to have a side opening 51 cut out in a semicircular shape below, and the bracket 3 can be attached along the edge of the side opening 51. When the side opening 51 is provided in this manner, the inside of the bracket 3 can be visually recognized, and the side opening 51 side force can be attached and detached by inserting a tool or the like. Further, in such a structure in which the side opening 51 is not provided, the light diffused by the anisotropic diffusing member 2 is reflected by the support 5 and irradiated onto the inspection object 7, and the support 5 Only the vicinity will become bright and uneven. However, the structure in which the side opening 51 is provided as described above has an advantage that light can be irradiated uniformly because reflection near the side can be eliminated.

Next, a process of assembling the illumination device 100 configured as described above, and an operation state of the substrate inspection apparatus 101 using the illumination device 100 will be described.

[0026] First, when assembling the lighting device 100, the bracket 3 is fixed with screws over the inside of the opposing support body 5. Then, the illumination substrate 1 is attached to the bracket 3 attached to the support 5 from the outside, and the anisotropic diffusion member 2 is also attached to the inside force. At this time, when the lighting board 1 is attached, the LED 11 is housed in the through hole 30 provided in the bracket 3 with the LED 11 facing downward. Then, with the LED 11 housed in the through-hole 30, the lighting substrate 1 is further strongly pressed against the bracket 3 side. Then L The ED 11 is strongly pushed along the inner wall surface of the through hole 30, and at this time, the two leg terminals extending from the lighting board 1 are bent. Along with this, the optical axis of the LED 11 is bent in the direction of the axial direction of the through hole 30, that is, toward the center position of the arcuate bracket 3. In this state, both ends of the lighting board 1 are fixed to the bracket 3 with screws. For other lighting boards 1 as well, press firmly into bracket 3 in the same way, and fix with screws. At this time, the LED11 of the lighting board 1 fixed to the bracket 3 is positioned so that the height of each LED11 follows the arc of the bracket 3, so the distance between the center position of the bracket 3 and the LED11 is constant. It can be.

[0027] Then, with the illumination substrate 1 attached to the bracket 3 as described above, the cover body 4 is attached further above. If necessary, the anisotropic diffusion member 2 is also attached to the inner part of the bracket 3.

[0028] After attaching the cover body 4 and the anisotropic diffusion member 2 in this way, the support body 5 is fixed to the apparatus main body (not shown) with screws, and finally the line sensor 6 is placed above the slit S of the bracket 3. Install so that the reflected light from the inspection object 7 can be received.

[0029] As described above, according to the present embodiment, in the illumination device 100 that irradiates light to the inspection object 7 from a plurality of directions, the illumination substrate 1 on which the plurality of LEDs 11 are arranged, and the illumination substrate 1 A semi-cylindrical bracket 3 for holding, and a through-hole 30 for housing the LED 11 on the outer side surface of the semi-cylindrical of the bracket 3, and the lighting board with the LED 11 accommodated in the through-hole 30 Since 1 is held by the bracket 3, even when the radius of the bracket 3 is reduced, the light of the LED 11 can be directed toward the center through the through hole 30 of the semi-cylindrical bracket 3. As a result, the light collection efficiency can be improved. However, since the bracket 3 has a semi-cylindrical shape, it is not necessary to attach a reinforcing member or the like to the bracket 3, and the mounting work of the lighting board 1 can be simplified.

[0030] In this embodiment, the through hole 30 provided in the bracket 3 is directed in the central direction of the semi-cylindrical shape, and the LED 11 is substantially inscribed in the through hole 30. As the LED 11 is inserted, the LED 11 leg terminal can be bent, and the LED 11 can be oriented toward the center of the bracket 3. [0031] Further, since the height position of the LED 11 on the illumination board 1 is an arc shape along the arc of the bracket 3, even if the radius of the bracket 3 is reduced, The distance between each LED 11 and the center position of the bracket 3 can be made constant, and the unevenness of illumination can be reduced.

Note that the present invention can be implemented in various modes without being limited to the above-described embodiment.

[0033] For example, in the above embodiment, the LED 11 is pushed into the through hole 30 of the bracket 3 and the leg terminal of the LED 11 is bent! /, But the LED 11 leg terminal is bent. Alternatively, the LED 11 may simply be inserted into the through hole 30. In this case, if the length of the through hole 30 in the axial direction is increased, the light from the LED 11 can be adjusted in the axial direction on the inner side, and similarly, the light can be collected at the center position of the bracket 3. become.

[0034] Furthermore, in the above-described embodiment, if a member that irradiates uniform light is not limited to the force LDL11 described using the LED 11 as the light emitting member, a member other than the LED 11 is used. Anyway.

[0035] In the above embodiment, the inspection object 7 is described by taking a printed circuit board as an example. 1S is not limited to this, and may be a liquid crystal panel, a printed material, or other materials.

Industrial applicability

[0036] Even when the radius of the bracket 3 is reduced, the light of the LED 11 can be directed toward the center through the through-hole 30 of the semi-cylindrical bracket 3, so that inspection of a small printed circuit board or liquid crystal panel, etc. It can also be applied to.

Claims

The scope of the claims

[1] In an illumination device that irradiates light from a plurality of directions on an irradiation object,

An illumination board in which a plurality of light emitting members are arranged;

A semi-cylindrical bracket for holding the illumination board,

A through hole for accommodating the light emitting member arranged on the substrate is provided on the outer side surface of the bracket, and the substrate is held by the bracket in a state where the light emitting member is accommodated in the through hole. A lighting device.

[2] The through hole has a semi-cylindrical axially directed shaft, and the light emitting member is accommodated in a state in which the light emitting member is substantially inscribed on the inner wall surface of the through hole. The lighting device according to claim 1.

[3] The illumination device according to [1], wherein the light emitting member is mounted on the illumination substrate so as to have a circular arc shape.