JP2014235051A - Inspection illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection illumination device that can irradiate an article with light from many directions in an upside and large range and from a substantially horizontal direction, and easily manufactures an illumination device body even when the illumination device body is low in height and small in size.SOLUTION: The inspection illumination device 1 includes: an illumination device body 2; and a dome-shaped light reflection body 3 that is mounted to the illumination device body 2 and reflects light on a reflection plane on the inner wall. The illumination device body 2 includes a substantially annular and thin printed board 4. On the top surface of the printed board 4, many surface-mount top-view type LEDs 7 for radiating light upward are mounted circumferentially. On the lower surface, many surface-mount side-view type LEDs 8 for radiating light toward the radial center part of the printed board 4 are mounted circumferentially.

Description

  The present invention relates to an inspection illumination device that irradiates an article with light for inspection.

  Conventionally, various inspection lighting devices have been used to perform appearance inspection (inspection of defects, scratches, dirt, foreign matter, etc.) for articles (products) produced in factories. Among them, as in the inspection illumination device 101 shown in FIG. 5, an illumination light source (often composed of a large number of LEDs) is formed inside the dome-shaped light reflector 103 by the reflection surface of its inner wall. There are those that reflect light and irradiate the article with light from multiple directions in a wide upper range (a range from an angle close to vertical to an angle close to horizontal) (for example, Patent Documents 1 and 2). In FIG. 5, reference numeral 102 denotes an illumination device body on which an illumination light source and components for controlling the illumination light source are mounted. Reference numeral 103b indicates an inspection hole, and at the time of inspection, an article is disposed immediately below and a camera is disposed above the article. Such an inspection illumination device 101 has less reflection of light on the surface of the article, and is less prone to shadows, making it easy to perform a fine inspection.

  By the way, depending on the article, for example, when the article is relatively small and needs to be inspected very finely, it is desired to irradiate the article with light not only from above but also from a very horizontal direction. The inspection illumination device 101 in this case can be configured as shown in FIG. The inspection illumination device 101 is based on a substantially annular thin first printed circuit board 104 and a closed belt-shaped thin second printed circuit board 105 in an illumination device main body 102 having a space in the center. It is fixedly attached to the member 106. The dome-shaped light reflector 103 is attached to the periphery of the upper surface of the base member 106. On the first printed circuit board 104, a large number of bullet-type LEDs 107 that emit light upward are mounted in a plurality of rows concentrically. The light emitted upward from the bullet-type LED 107 is reflected by the reflecting surface 103a on the inner wall of the dome-shaped light reflector 103, and is irradiated on the article from a wide range of upper directions. In addition, on the closed thin belt-like second printed circuit board 105, a number of bullet-type LEDs 108 that emit light toward the central part of the second printed circuit board 105, that is, the central part of the illumination device main body 102 are circular. It is mounted in a circumferential shape. The light emitted from the bullet-type LED 108 is irradiated onto the article in a substantially horizontal direction. Although the second printed circuit board 105 is thin, a certain thickness is required for heat radiation of the bullet-type LED 108 and components (not shown) for controlling the same.

JP 2004-125644 A WO2012 / 005337

  Further, the inspection illumination device 101 ′ shown in FIG. 7 uses surface mounted LEDs 107 ′ and 108 ′ instead of the bullet type LEDs 107 and 108 of the inspection illumination device 101. This inspection illumination device 101 ′ includes a substantially annular thin first printed circuit board 104 ′ and a closed belt-shaped thin second printed circuit board 105 ′ in an illumination device main body 102 ′ having a space in the center. Are attached to the base member 106 '. The dome-shaped light reflector 103 is attached to the periphery of the upper surface of the base member 106 '. On the first printed circuit board 104 ′, a large number of surface-mounted LEDs 107 ′ that emit light upward are mounted in a plurality of rows concentrically. The light emitted upward from the surface-mounted LED 107 ′ is reflected by the reflecting surface 103 a on the inner wall of the dome-shaped light reflector 103, and irradiates the article from a wide range of upper directions. The closed belt-like thin second printed circuit board 105 ′ has a number of surface mounts that emit light toward the center of the second printed circuit board 105 ′, that is, the center of the illumination device main body 102 ′. A mold LED 108 'is mounted on the circumference. The light emitted from the surface-mounted LED 108 'is applied to the article in a substantially horizontal direction. Here, the surface-mounted LEDs 107 ′ and 108 ′ emit light having a certain range of directivity around the vertical direction with respect to the surfaces of the printed circuit boards 104 ′ and 105 ′ on which they are mounted. The printed circuit board 105 'is thin, but needs a certain thickness for heat radiation of the surface-mounted LED 108' and components (not shown) for controlling the surface-mounted LED 108 '.

  This inspection illumination device 101 ′ tends to be high (thick) because the first printed circuit board 104 ′ on which the surface-mounted LED 107 ′ is mounted and the lower part thereof are thinned and the second printed circuit board 105 ′ is high. The height of the lighting device main body 102 'is suppressed. Then, the distance from the reflecting surface 103a on the inner wall of the light reflector 103 to the article becomes longer and the illuminance decreases, or the light from the skirt (low altitude portion) of the reflecting surface 103a on the inner wall of the light reflector 103 Can be prevented from being blocked.

  However, the second printed circuit board 105 ′ of the inspection illumination device 101 ′ is manufactured by mounting the surface mount type LED 108 ′ when the belt is open and then bending and bonding both ends. Then, when the inspection illumination device 101 ′ is a small size, the curvature of bending of the second printed circuit board 105 ′ becomes large and it is difficult to bend. Further, when the bending curvature is increased, there is a concern that a crack or the like may occur in the mounting portion of the surface-mounted LED 108 '.

  The present invention has been made in view of the above-mentioned reasons, and the object thereof is to irradiate light on an article from a wide range of upper directions and from a substantially horizontal direction, and the height of the lighting device main body is low. An object of the present invention is to provide an inspection illumination device that is easy to manufacture even in a small size.

  In order to achieve the above object, an inspection illumination device according to claim 1 is an inspection illumination device comprising: an illumination device body; and a dome-shaped light reflector that is attached to the illumination device and reflects light at a reflection surface of an inner wall. The lighting device body includes a thin, generally annular printed circuit board, and the printed circuit board has a number of surface-mounted top-view LEDs that emit light upward on its upper surface. A number of surface-mounted side-view LEDs that emit light toward the center of the printed circuit board in the radial direction are mounted on the lower surface of the printed circuit board.

  The inspection illumination device according to claim 2 is the inspection illumination device according to claim 1, wherein the surface-mount top-view type LED is closer to a center portion in the radial direction of the printed board than the surface-mount side-view type LED. A base member having a high thermal conductivity is in contact with the lower surface of the printed circuit board directly below the surface mount top view type LED.

  The inspection illumination device according to claim 3 is the inspection illumination device according to claim 1 or 2, wherein the illumination device body further includes a diffusion plate that diffuses light emitted from the surface-mount side-view type LED. The diffuser plate is configured such that at least a part of the diffuser plate is positioned closer to the center of the printed circuit board in the radial direction than the surface-mounted side-view LED.

  The inspection illumination device according to claim 4 is the inspection illumination device according to claim 3, wherein the diffusion plate has the other portion positioned below the surface-mount side-view type LED. .

  According to the present invention, a surface-mounted top-view LED is mounted on the upper surface of a printed circuit board, and a surface-mounted side-view LED is mounted on the lower surface. Thus, it is possible to provide an inspection illumination device that is low in height and easy to manufacture even in a small size.

It is sectional drawing of the test | inspection illumination apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the structure at the time of the test | inspection of a test | inspection illumination apparatus same as the above. It is a top view of the illuminating device main body of a test | inspection illuminating device same as the above. It is a bottom view of the printed circuit board of a test | inspection illumination apparatus same as the above. It is an external view of a general inspection lighting device. It is sectional drawing of the conventional test | inspection illumination apparatus. It is sectional drawing of the test | inspection illumination apparatus using surface mount type LED instead of the bullet-type LED of the conventional test | inspection illumination apparatus.

  Hereinafter, modes for carrying out the present invention will be described. As shown in FIG. 1, an inspection illumination device 1 according to an embodiment of the present invention includes an illumination device body 2 and a dome-shaped light reflector 3 that is attached to the illumination device body 2 and reflects light by a reflection surface 3 a of an inner wall. ing. The dome shape is a shape that can cover an article to be inspected, such as a substantially hemispherical shape or a substantially semi-oval shape. The inner wall of the dome-shaped light reflector 3 is a concave curved surface. In FIG. 1, reference numeral 3b denotes a viewing hole. At the time of the inspection, as shown in FIG. 2, the article M to be inspected is disposed directly below the inspection hole 3b, and the camera C is installed above the inspection hole 3b. In FIG. 2, light is indicated by broken lines. In FIG. 2, the mounting table for the article M, the support table for the inspection lighting device 1, and the support table for the camera C are omitted.

  The illuminating device main body 2 has a thin, substantially annular printed circuit board 4 on which an illumination light source to be described later and components for controlling the illumination light source are mounted. The printed circuit board 4 is attached to the upper surface side of the base member 6 with screws or the like. The dome-shaped light reflector 3 is attached to the periphery of the upper surface of the base member 6 with screws or the like. The base member 6 is made of a hard material in order to maintain the mechanical strength of the lighting device main body 2, and is made of a material having high thermal conductivity for heat dissipation of components mounted on the printed circuit board 4. The base member 6 can be made of aluminum, for example.

  As shown in FIG. 3, the printed circuit board 4 has a plurality of surface-mounted top-view LEDs 7 that emit light upward as a light source for illumination on a top surface thereof. It is implemented with columns (two columns in this example). As shown in FIG. 2, the light emitted upward from the surface mount top-view type LED 7 is reflected by the reflecting surface 3a of the inner wall of the dome-shaped light reflector 3, and the upper surface is wide (from an angle close to vertical to horizontal The article M is irradiated with light from multiple directions). By irradiating light from the surface-mounted top-view type LED 7, the reflection of light on the surface of the article is small, shadows are unlikely to occur, and fine inspection becomes easy.

  As the surface-mount top-view type LED 7, a known one as a surface-mount top-view type LED can be used, and a certain range centering on a direction perpendicular to the surface (mounting surface) of the printed circuit board 4 on which the surface-mount top-view type LED is mounted. Light is emitted with the directivity of. The surface-mount top-view type LED 7 having a substantially square shape in plan view as shown in FIG. 3 and having a thickness of 1 mm or less can be used. In addition, a large number of surface-mount top-view LEDs 7 may be mounted in a single circumferential row as long as the illuminance required for the article can be secured.

  As shown in FIG. 4, the printed circuit board 4 has a plurality of surface-mount side-view LEDs 8 that emit light toward the center of the printed circuit board 4 in the radial direction as a light source for illumination. It is implemented in the shape. The light emitted from the surface-mounted side-view type LED 8 is applied to the article M from a substantially horizontal direction directly or through a diffusion plate 9 as described later (see FIG. 2). . By irradiating light from the surface-mounted side-view type LED 8, for example, the edge of the surface of the article is emphasized, and the vicinity of the side surface of the article can be easily inspected finely.

  As the surface-mount side-view type LED 8, a known one as a surface-mount side-view type LED can be used, and a certain range centering on a parallel direction to the surface (mounting surface) of the printed circuit board 4 on which the surface-mount side-view type LED is mounted. Light is emitted with the directivity of. The surface-mount side-view type LED 8 has a substantially rectangular shape in plan view as shown in FIG. 4 and emits light from the long side portion.

  Although not shown, the printed circuit board 4 is mounted with components (for example, resistors) for its control in addition to the surface mount top view type LED 7 and the surface mount side view type LED 8.

  Thus, in this inspection illumination device 1, by mounting the surface mount top view type LED 7 on the upper surface of the printed circuit board 4 and the surface mount side view type LED 8 on the lower surface, a wide upper range (from a vertical angle to a horizontal direction) It is possible to irradiate the article with light from multiple directions (ranges reaching close angles) and from a substantially horizontal direction. Further, since the surface-mounted top-view type LED 7 and the surface-mounted side-view type LED 8 are mounted on one thin printed circuit board 4, the height of the illuminating device main body 2 can be reduced, thereby reducing the light The distance from the reflecting surface 3a on the inner wall of the reflector 3 to the article is shortened to increase the illuminance, and light from the skirt (low altitude) of the reflecting surface 3a on the inner wall of the light reflector 3 is difficult to be blocked. Become. Further, since the printed circuit board 4 does not require a manufacturing process for bending, the printed circuit board 4 can be easily manufactured even if the inspection illumination device 1 is small.

  Regarding the arrangement of the surface-mounted top-view type LED 7 and the surface-mounted side-view type LED 8, the surface-mounted top-view type LED 7 is arranged on the side farther from the central portion in the radial direction of the printed circuit board 4 than the surface-mounted side-view type LED 8 is. The base member 6 is preferably in contact with the lower surface of the printed circuit board 4 immediately below the surface mount top view type LED 7. With this configuration, heat generated from the surface mount top view type LED 7 is conducted in the thickness direction of the printed circuit board 4, and is efficiently radiated through the base member 6 having high thermal conductivity. Further, the heat generated from the surface-mounted side-view type LED 8 is conducted in the plane direction of the printed circuit board 4 (perpendicular to the thickness direction), and the center of the printed circuit board 4 in the radial direction is larger than that of the surface-mounted top-view type LED 7. The heat is efficiently radiated through the base member 6 having a high thermal conductivity at a position close to the portion. Therefore, in the printed circuit board 4 and the base member 6, the heat generated from the surface-mounted top-view type LED 7 and the heat generated from the surface-mounted side-view type LED 8 are appropriately mixed to be locally prevented from becoming a high temperature, Appropriate heat dissipation is easily achieved.

  Moreover, the illuminating device main body 2 can be provided with a diffusion plate 9 that diffuses (multi-directionally) the light emitted from the surface-mounted side-view LED 8. At least a part of the diffuser plate 9 is located closer to the center of the printed board 4 in the radial direction than the surface-mounted side view LED 8. The diffusing plate 9 can be made of a known material, for example, acrylic or polycarbonate.

  The diffusing plate 9 is preferably bent so that the other part is positioned below the surface-mounted side-view LED 8. Thereby, even if the directivity of the surface-mount side-view type LED 8 is considerably weak, it can be used.

  The inspection lighting device according to the embodiment of the present invention has been described above. However, the present invention is not limited to that described in the embodiment, and various design changes within the scope of the matters described in the claims. Is possible. For example, when the base member 6 is composed of several members, only the member related to heat dissipation can be made of a material having high thermal conductivity.

DESCRIPTION OF SYMBOLS 1 Inspection illumination device 2 Illumination device main body 3 Light reflector 3a Reflection surface of light reflector 4 Printed circuit board 6 Base member 7 Surface mount top view type LED (light source for illumination)
8 Surface-mount side-view type LED (light source for illumination)
9 Diffusion plate

Claims (4)

In an inspection illumination device comprising: an illumination device main body; and a dome-shaped light reflector that reflects light at a reflection surface of an inner wall attached to the illumination device main body;
The illuminating device main body is configured to have a thin, generally annular printed circuit board,
The printed circuit board has a large number of surface-mount top-view LEDs that emit light upward on its upper surface, and is mounted on the lower surface to emit light toward the radial center of the printed circuit board. A plurality of surface-mounted side-view type LEDs mounted in a circumferential shape. The inspection lighting device according to claim 1,
The surface mount top view type LED is disposed on a side farther from the center portion in the radial direction of the printed board than the surface mount side view type LED,
An inspection illumination apparatus, wherein a base member having a high thermal conductivity is in contact with a lower surface of the printed circuit board directly below the surface mount top view type LED. In the inspection illumination device according to claim 1 or 2,
The illuminating device main body further includes a diffusion plate that diffuses light emitted from the surface-mounted side-view type LED,
The inspection illuminating device, wherein at least a part of the diffusion plate is located closer to a center portion in a radial direction of the printed board than the surface-mount side-view type LED. The inspection illumination device according to claim 3,
The inspection illuminating device, wherein the other part of the diffusion plate is positioned below the surface-mounted side-view type LED.

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