JP6614841B2 - Light irradiation device - Google Patents

Description

  The present invention relates to a light irradiation apparatus that irradiates a test object with light during an appearance inspection of a product.

As a method for inspecting the surface of a product, a method of illuminating a product using a lighting device that emits light from the bottom surface and inspecting the reflected light by visual observation or photographing in the vicinity of the lighting device is generally used. Are known.
The thing of patent document 1 is known as an example of such an illuminating device. The illumination device is a backlight illumination device for performing uniform surface light emission. The backlight illumination device includes a rectangular frame casing, a light emitting unit provided in the casing, and light from the light emitting unit. And a light guide plate having a flat plate shape and a rectangular outer shape for performing uniform surface light emission to the outside through a diffusion cover that covers the opening of the casing.
LED frames on which LEDs serving as light emitting portions are mounted are respectively attached to the frames constituting the four side portions of the rectangular frame-shaped casing.

JP 2003-139712 A

By the way, in the said conventional illuminating device, the casing (holding body) holding a light emission part is integrally formed in the rectangular frame shape. For example, the casing is integrally formed by cutting out from a metal such as aluminum as a raw material.
For this reason, when manufacturing illuminating devices of different sizes and shapes, it is necessary to form the casing by cutting or the like in accordance with the size and shape, which takes time and cost.

  This invention is made | formed in view of the said situation, and it aims at providing the light irradiation apparatus which can be manufactured easily and at low cost, even when a magnitude | size, a shape, etc. differ.

  In order to achieve the above object, a light irradiation device of the present invention includes a polygonal annular holding body that holds a light emitter, and the holding body includes a plurality of joint members that form corners thereof. And a base member that is disposed between joint members adjacent to each other in an annular direction, has an end connected to the joint member, and holds the light emitter.

  In the present invention, the shape and size of the holding body can be easily changed by appropriately changing the length of the base member and the number and shape of the joint members. Therefore, even when the size, shape, etc. are different, the light irradiation device can be manufactured easily and at low cost.

  The said structure of this invention WHEREIN: It is preferable that the said joint member has an engaging part and the said base member has a to-be-engaged part with which the said engaging part engages. According to such a configuration, by engaging the engaging portion of the joint member with the engaged portion of the base member, the base member can be easily and reliably connected to the joint member, and assembly can be facilitated. .

  Moreover, in the said structure of this invention, it is preferable that the said engaging part is fixed by the fastening member in the state engaged with the said to-be-engaged part, and if it does in this way, a base member will be from a joint member. It can be prevented from coming off.

  Further, in the configuration of the present invention, at least one of the joint members includes an insertion hole through which an electric cable for supplying power to the light emitter is inserted from the outside, and prevents the electric cable inserted through the insertion hole from being pulled out. It is preferable to have a retaining portion. According to such a configuration, the electrical cable can be prevented from being pulled out by the retaining portion. Therefore, since it is not necessary to press the electric cable with a joint member, a base member, or the like in order to prevent the electric cable from coming out, the soundness of the electric cable can be maintained.

  Further, in the configuration of the invention, the base member is provided with a concave portion in which an optical element having an optical member and a support portion that supports the optical member is accommodated, and an inlet portion of the concave portion, and the support portion is provided. A contact portion that prevents the optical element from coming out of the recess by contacting, and a pressing member that is provided at the bottom of the recess and presses the support portion toward the contact portion. Is preferred.

  According to such a structure, the support part of an optical element can contact | abut to a contact part with a press member, and can position and hold an optical member in the predetermined position of a recessed part. Even when the shape and size of the optical member are different, it is only necessary to change the thickness of the pressing member.

  In addition, as a specific example of the light emitter in the present invention, there may be mentioned one constituted by a light guide plate provided inside a polygonal annular holder, and a light emitting element that allows light to enter from the side end face of the light guide plate.

  According to the present invention, a light irradiation device can be manufactured easily and at low cost even when the size, shape, and the like are different.

It is the perspective view which showed the light irradiation apparatus which concerns on embodiment of this invention. FIG. It is a perspective view which shows a joint member equally. It is a perspective view which shows the edge part of a joint member and a base member equally. FIG. FIG. 6A is an enlarged view of a portion X in FIG. 5, and FIG. 6B is a cross-sectional view of a main portion when the thickness of the light guide member is different. It is sectional drawing which shows the principal part of the light irradiation apparatus of a modification similarly. It is a perspective view which shows an optical element similarly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a light irradiation apparatus according to an embodiment of the present invention. FIG. 1 is a perspective view, and FIG. 2 is an exploded perspective view.

The light irradiation apparatus according to the present embodiment is used for irradiating light to a product at the time of appearance inspection of the product, and the LED substrate 1 on which the LED 1a (see FIG. 6) as a light emitting element is mounted. A holding body 2 is provided. The holding body 2 includes four joint members 3 and four base members 4 and is formed in a square ring shape (rectangular frame shape) by joining them in a square ring shape in plan view.
In addition, a square-shaped transparent light guide plate 5 and a square-shaped protective plate 6 provided on the surface of the light guide plate 5 are provided inside the holder 2, and the surface of the holder 2 (FIG. 2). A square annular cover member 7 is provided on the upper surface.

The joint member 3 constitutes a corner of the square annular holding body 2 and is formed in a substantially L shape in plan view.
As shown in FIG. 4, one joint member 3 </ b> A among the four joint members 3 prevents an insertion hole 10 through which the electric cable K is inserted from the outside and the electric cable K inserted through the insertion hole 10 from coming out. The remaining three joint members 3 do not have the insertion hole 10 and the retaining portion 11. The joint member 3 </ b> A has the same size and shape as the remaining joint member 3 except for the insertion hole 10 and the retaining portion 11.

As shown in FIG. 3, the three joint members 3 have a main body portion 3a formed in an L shape in plan view and a wall portion 3b formed in a substantially L shape in plan view. 3b protrudes upward from the edge of the outer surface side of the main body 3a. Therefore, a mounting surface 3c for mounting the corner portion of the cover member 7 is provided on the upper surface of the main body 3a. The mounting surface 3c is provided with a screw hole 3d.
Further, engaging portions 12 are provided on both end surfaces of the main body portion 3a of the joint member 3 so as to protrude from the substantially central portion of the end surfaces. The engaging portion 12 is formed in a substantially rectangular parallelepiped shape, and a screw hole 12a is provided in a substantially central portion so as to penetrate the engaging portion 12.
Further, a bottom wall 3e is provided on the lower surface side of the joint member 3 in parallel with the placement surface 3c, and rises perpendicularly to the bottom wall 3e at an edge portion disposed at a right angle of the bottom wall 3e. Two standing walls 3f, 3f are provided. The upright walls 3f and 3f are positioned at right angles to each other and can come into contact with an end face of a light guide member 23 of the optical element 22 described later.

Since the joint member 3A has the same configuration as the joint member 3 except for the insertion hole 10 and the retaining portion 11 as described above, the same reference numeral is given to the same configuration and the description thereof is omitted.
The insertion hole 10 is provided so as to penetrate one piece of the substantially L-shaped joint member 3A.
Further, a quadrangular columnar column 11 as a retaining portion 11 is erected on the bottom wall 3e. The column 11 is arranged such that its central axis is shifted from the extension line of the center of the insertion hole 10 by a predetermined distance on the other side of the joint member 3A. Then, the electric cable K inserted through the insertion hole 10 is bent at a substantially right angle in the vicinity of the insertion hole 10 and passes between the column 11 and one of the main body portions 3a, and further at the corner of the column 11. It bends at a right angle and passes between the column 11 and the other piece of the main body 3a so as to be connected to the LED substrate 1. Therefore, the electric cable K is sandwiched between the support column 11 and both pieces of the main body portion 3a, and is prevented from coming out from the insertion hole 10.

  As shown in FIGS. 2 and 4, the base member 4 is formed in a substantially rectangular bar shape by an extruded product of aluminum. Since the base member 4 is an extruded product in this way, the cross-sectional shape thereof is the same at any position in the longitudinal direction of the base member 4.

A recess 15 that is a nut slot is formed along the longitudinal direction of the base member 4 on the outer surface facing the outside of the base member 4 (outside of the holding body 2). Opened on both end faces. In addition, the part with the large opening width formed in the longitudinal direction center part is a nut insertion port.
As shown in FIGS. 5 and 6, the recess 15 includes a first recess 16 and a second recess 17 having a rectangular cross section. The second recess 17 is formed in a rectangular shape having a smaller cross-sectional shape than the first recess 16, is provided at the bottom of the first recess 16, and communicates with the first recess 16.
The engaging portion 12 is inserted into and engaged with both end portions of the first recessed portion 16 from the end face of the base member 4, and the end portion 16 a of the first recessed portion 16 is covered with the engaged portion 12. The engaging part 16a is comprised. Further, on the opening side of the first recess 16 (the opening side of the outer surface of the base member 4), wall portions 18 and 18 that narrow the opening of the first recess 16 in the vertical direction are along the longitudinal direction of the base member 4. Is formed. The engaging portion 12 inserted into the end portion (engaged portion) 16a of the first concave portion 16 abuts against the wall portions 18 and 18 so that the first concave portion 16 is prevented from coming out from the opening.

Further, a set screw (fastening member) 20 can be inserted from the opening of the first recess 16 (between the wall portions 18 and 18). The set screw 20 is engaged with the engaged portion 16a. The engagement portion 12 is screwed into the screw hole 12a.
Then, as shown in FIG. 6, when the set screw 20 is screwed into the screw hole 12a and tightened, the tip of the set screw 20 comes into contact with the bottom surface of the second recess 17, and when the set screw 20 is further screwed, The engagement portion 12 is fixed to the engaged portion 16a by the engagement portion 12 moving toward the wall portions 18 and 18 by the rotation of the set screw 20 and being pressed against the wall portions 18 and 18.

Further, as shown in FIG. 5, a recess 21 is formed along the longitudinal direction of the base member 4 on the inner surface facing the inner side of the base member 4 (inner side of the holding body 2). The member 4 is open on the inner surface and both end surfaces.
As shown in FIG. 6, a strip-like LED substrate 1 that is long in the longitudinal direction of the base member 4 is inserted into the recess 21 from the end face side of the base member 4.
A transparent optical element 22 is inserted into and stored in the recess 21 from the end face side of the base member 4 in front of the LED substrate 1. The optical element 22 includes a transparent light guide member 23 and a support portion 24 that supports the light guide member 23. The light guide member 23 guides the light emitted from the LED 1a to the light guide plate 5 side, and guides the light incident on the inside to the light guide plate 5 side while reflecting the light, and from the end surface on the light guide plate 5 side to the outside. Let it fire.

  A wall portion 19 projects upward at the upper surface edge (outer upper surface edge) of the base member 4 and is formed along the longitudinal direction of the base member 4. Therefore, a placement surface 4 c on which the cover member 7 is placed is provided on the upper surface of the base member 4. The mounting surface 4c is provided with screw holes 4d, 4d (see FIG. 2).

The light guide member 23 is formed in a trapezoidal cross section, and has a long bar shape as shown in FIG. The support portion 24 is formed integrally with the light guide member 23 at predetermined intervals along the longitudinal direction of the light guide member 23 so as to protrude from both side surfaces.
The distal end portion of the support portion piece 24 a protruding from one side surface of the light guide member 23 is recessed from the distal end surface 23 a of the light guide member 23, and the proximal end portion of the support portion piece 24 a is from the proximal end surface 23 b of the light guide member 23. It protrudes. The distal end portion of the support piece 24 b that projects from the other side surface of the light guide member 23 protrudes from the distal end surface 23 a of the light guide member 23, and the proximal end portion of the support piece 24 b is the proximal end surface of the light guide member 23. It protrudes from 23b.
Further, as shown in FIG. 6, the distance between the base end portion of the support piece 24a and the base end portion of the support piece 24b is longer than the width of the LED 1a, and the support piece 24a and the support piece 24b. Each of the projection lengths is longer than the thickness of the LED 1a.
In such an optical element 22, the base end portions of the support portion pieces 24a and 24b abut against the LED substrate 1, and the LED 1a is formed by the base end portion of the support portion piece 24a and the base end portion of the support portion piece 24b. Is stored in the concave portion 21.

In addition, contact portions 25 and 26 that prevent the optical element 22 from coming out of the recess 21 are provided at the entrance of the recess 21.
The contact portion 25 protrudes downward from the upper edge portion of the entrance portion of the recess 21 and is provided along the longitudinal direction of the base member 4. The tip of the support piece 24 a of the optical element 22 is in contact with the contact portion 25.
The contact portion 26 protrudes upward from the lower edge portion of the entrance portion of the recess 21 and is provided along the longitudinal direction of the base member 4, and further protrudes from the contact portion 25 to the inside of the holding body 2. ing. The tip of the support piece 24 b of the optical element 22 is in contact with the contact portion 26. In addition, an outer peripheral portion of the lower surface of the light guide plate 5 is installed on the upper surface of the contact portion 26, and the upper side end surface of the light guide plate 5 is in contact with the lower outer surface of the contact portion 25 so as not to contact the light guide member 23. It has become.

Further, a pressing member 30 is provided at the bottom of the recess 21 by being inserted from the end face side of the base member 4. The pressing member 30 is made of a metal having excellent thermal conductivity, and conducts heat generated in the LED 1a to the base member 4 and dissipates it to the outside.
In addition, the pressing member 30 has elasticity, and is elastically compressed while being inserted into the bottom of the recess 21, and the elastic return force causes the support portion 24 of the optical element 22 to be brought into contact portions 25 and 26. It is pushing toward. Therefore, the optical element 22 housed in the recess 21 is sandwiched between the contact portions 25 and 26 and the pressing member 30, thereby positioning the recess 21 in the depth direction and backlashing in the depth direction. Does not occur. Further, since the light guide member 23 does not protrude from the inner peripheral surface of the base member 4, the light guide member 23 may be damaged when the light irradiation device is assembled or when the light guide plate 5 is disposed inside the base member 4. Is prevented. Furthermore, since the support portion pieces 24a and 24b constituting the support portion 24 of the optical element 22 are in contact with the opposing inner surfaces of the concave portion 21, the optical element 22 is positioned in the vertical direction in FIG.

The light guide plate 5 faces the light guide member 23 of the optical element 22 with a predetermined gap at the side end face. Therefore, the light from the LED 1 a passes through the inside of the light guide member 23 and enters the light guide plate 5 from its side end face.
On the surface (upper surface) of the light guide plate 5, a large number of reflecting portions (not shown) for reflecting a part of the light incident on the light guide plate 5 and guiding it downward are provided at predetermined intervals. The reflection part is formed by, for example, providing two layers of black and white on the surface of the light guide plate 5 so as to overlap each other by printing. Note that white constitutes the lower layer, and black constitutes the upper layer.
In the light irradiation apparatus including the light guide plate 5 having such a configuration, as illustrated in FIG. 5, the inspection light irradiated and reflected on the inspection target 31 is transmitted between the reflection portions and is guided to the light guide plate 5. Is taken in by a CCD camera 32 as an imaging means disposed above. In addition, the said LED board 1, LED1a, the light-guide plate 5, and the optical element 22 correspond to the light-emitting body said to a claim.

FIG. 7 is a cross-sectional view of a main part showing a modification of the light irradiation device.
In FIG. 7, the recess 21 </ b> A provided in the base member 4 is shallower than the recess 21.
Further, the lens 23A of the optical element 22A is a cylindrical lens, and the support portion 24A is configured by an overhang portion 24A that projects from the lens 23A.
Since the other configuration is the same as that of the light irradiation apparatus of the present embodiment shown in FIG. 6, the same components are denoted by the same reference numerals, and the description thereof is omitted.

When assembling the light irradiation apparatus of the present embodiment, four joint members 3 and four base members 4 are prepared, and the pressing member 30 and the LED 1a are mounted in the recesses 21 of the base members 4 in advance. The optical element 22 is stored.
Moreover, after the electric cable K is inserted from the outside into the insertion hole 10 of one joint member 3 </ b> A among the four joint members 3, the retaining portion 11 prevents the electric cable K from coming out.

Next, both ends of the base member 4 are connected to the joint members 3 and 3 respectively. At this time, as shown in FIG. 4, the engaging portion 12 of the joint member 3 is connected to the engaged portion 16a of the base member 4. The joint member 3 and the base member 4 are fixed by the set screw 20 after being inserted and engaged.
By the four joint members 3 and the four base members 4, the square annular holding body 2 is assembled in a plan view, and the electric cable K is connected to the predetermined LED substrate 1.

  Finally, the light guide plate 5 is placed on the upper surface of the abutting portion 26 of the base member 4, the protective plate 6 is placed on the upper surface of the light guide plate 5, and the placement surfaces 4 c and 3 c of the holding body 2. The cover member 7 is placed on the holder 2, and the cover member 7 is fixed to the holding body 2 with screws 40 and 41.

As described above, according to the present embodiment, the four joint members 3 and the four base members 4 constitute the rectangular frame-shaped holding body 2 and the base member 4 is formed of an extruded product. The length of 4 can be easily changed. In addition, by changing the length of the base member 4, the shape and size of the holding body 2 can be easily changed.
For example, by changing the length of the four base members 4 and setting them to the same length, the size of the holding body 2 can be easily changed while keeping the shape of the holding body 2 similar. Further, by changing the length of each of the four base members 4, the shape and size of the holding body can be easily changed.
Even when the holding body is a polygonal ring other than a rectangular ring, a joint member corresponding to the shape of the corner is prepared, and the length and length of the base member can be changed to facilitate the shape and size of the holding body. Can be changed.
Therefore, even when the size, shape, and the like are different, the light irradiation device can be manufactured easily and at low cost.

Further, by engaging the engaging portion 12 of the joint member 3 with the engaged portion 16a of the base member 4, the joint member 3 and the base member 4 can be easily and reliably joined, and a set screw (fastening member) ) 20 can prevent the base member 4 from being detached from the joint member 3.
Further, since the joint member 3 has the insertion hole 10 and the retaining portion 11, the electrical cable K inserted through the insertion hole 10 can be prevented from being pulled out. For this reason, since it is not necessary to press the electric cable K with the joint member 3, the base member 4, etc. in order to prevent the electric cable K from coming out, the soundness of the electric cable K can be maintained.
Further, since the base member 4 has the concave portion 21 and the contact portions 25 and 26 and the pressing member 30 is provided at the bottom of the concave portion 21, the optical element 22 accommodated in the concave portion 21 has the support portion 24. It is pressed by the pressing member 30 and comes into contact with the contact portions 25 and 26. Therefore, the light guide member 23 can be positioned and held at a predetermined position of the recess 21.
Even when the shape and size of the light guide member 23 are different, the light guide member 23 can be positioned and held at a predetermined position of the recess 21 by changing the thickness of the pressing member 30. .
For example, as shown in FIG. 6B, even if the thickness of the light guide member 23 and the length of the support portion 24 are smaller than those shown in FIG. 6A, the pressing member 30 is made thicker. be able to.

  In the present embodiment, the square annular holding body 2 has been described as an example. However, in the present invention, the holding body is not limited to the square annular shape, and can be applied to a polygonal annular shape including a triangular annular shape. In this case, the base member may be formed in a rod shape, and the joint member may have a shape that forms a polygonal corner. The light emitted from the LED 1a is not limited to visible light, but may be ultraviolet light or infrared light, and can be appropriately selected according to the aspect of product inspection.

1 LED board 2 LED (light emitting element)
3, 3A Joint member 4 Base member 11 Detachment part 12 Engagement part 15 Recess 16a Engagement part 20 Set screw (fastening member)
21 Concave part 22, 22A Optical element 23, 23A Light guide member 24, 24A Support part 25, 26 Contact part 30, 30A Press member K Electric cable

Claims (5)

A light irradiation device including a polygonal annular holder for holding a light emitter,
A plurality of joint members that form the corners of the holding body, and a base member that is disposed between joint members adjacent to each other in an annular direction, has an end connected to the joint member, and holds the light emitting body. Prepared ,
The joint member has an engaging portion;
The base member has an engaged portion with which the engaging portion is engaged,
The engaged portion is open to an outer surface and an end surface facing the outer side of the base member,
On the opening side of the outer surface, a wall portion that narrows the opening width of the opening is formed,
The engaging portion is inserted into and engaged with the engaged portion from the opening of the end surface, and is brought into contact with the wall portion to prevent the outer surface from coming out of the opening. A light irradiation device. The light irradiation apparatus according to claim 1 , wherein the engaging portion is fixed by a fastening member in a state in which the engaging portion is engaged with the engaged portion. At least one of the joint members includes an insertion hole through which an electric cable for supplying electric power to the light emitter is inserted from the outside, and a retaining portion that prevents the electric cable inserted through the insertion hole from being pulled out. The light irradiation apparatus according to claim 1 or 2 . The said light-emitting body is comprised from the light-guide plate provided in the inside of the said holding body, and the light-emitting element which injects light from the side end surface of the said light-guide plate, The any one of Claims 1-3 characterized by the above-mentioned. light irradiation apparatus according to claim. The base member is provided with an optical element having an optical member and a support portion that supports the optical member, and a support portion that is provided at an entrance portion of the recess so that the support portion comes into contact with the base member. a contact portion for preventing coming off of the optical element, provided at the bottom of the recess claims 1-4, characterized in that it comprises a pressing member for pressing said supporting portion to said contact portion The light irradiation apparatus of any one of these.

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