JP2013143350A - Line light irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a line light irradiation device with irradiance unevenness eliminated.SOLUTION: Of the line light lighting device provided with a light-emitting unit made up of a plurality of LED packages arrayed in a row on a long-size substrate along a length direction, and a long-size convergent member fitted along a length direction at an upper part of the light-emitting unit, each LED package is provided with a plurality of LED elements arranged at a given interval so as to be positioned at an intersection of a lattice along a first direction and a second direction different from the first, and it is so set that an arraying direction of the LED package and the first direction as well as the second direction of the LED elements are to be different from each other.

Description

  The present invention relates to a line light irradiation apparatus that can irradiate line-shaped light using a plurality of LED packages, and particularly relates to an apparatus suitably used for curing an adhesive or the like by irradiating ultraviolet rays. is there.

  Conventionally, as a line light irradiation device, as shown in Patent Document 1, a device including a light emitting unit in which a plurality of LED packages are arranged in a row is known.

  In the light emitting unit 3 ′ of such a line light irradiation device, when a plurality of LED packages 32 ′ are mounted on the long wiring substrate 31 ′, as shown in FIG. The vertical (or horizontal) direction of the LED package 32 ′ is matched. However, as shown in FIG. 12, when an LED package 32 'mounted with a plurality of LED elements 322' (four in the embodiment shown in this figure) is used, the arrangement direction of the LED package 32 'and the LED When the vertical (or horizontal) direction of the package 32 'is matched, two peaks are formed in the irradiance distribution in the horizontal direction (BB line direction) as shown in FIG. There is a problem that it is difficult to collect light so that the irradiance is sufficient for curing the agent by irradiating it with ultraviolet rays.

JP 2002-93227 A

  The present invention has been made in view of such problems, and it is a main aim of the present invention to provide a line light irradiation apparatus in which unevenness in irradiance is eliminated.

  That is, the line light illuminating device according to the present invention is provided along a longitudinal direction on a light emitting unit in which a plurality of LED packages are arranged in a line along the longitudinal direction on a long substrate, and on the light emitting unit. A line light illuminating device including a long condensing member, wherein the LED package is positioned on a lattice intersection along a first direction and a second direction different from the first direction. A plurality of LED elements arranged at predetermined intervals as described above, and the arrangement direction of the LED packages is different from the first direction and the second direction in which the LED elements are arranged. To do. Examples of the long condensing member include a rod lens, a cylindrical lens, a reflector member having a long reflecting surface, and the like.

  If it is such, since it can prevent that a some peak is formed in the irradiance distribution of a horizontal direction, the irradiance nonuniformity of a horizontal direction can be eliminated. Further, according to the present invention, the magnitude of the peak value of the irradiance and the magnitude of the integrated value of the irradiance can be controlled only by adjusting the arrangement angle of the LED package.

  As the line light illuminating device according to the present invention, for example, one in which the arrangement direction of the LED packages intersects with the first direction and the second direction in which the LED elements are arranged at an angle of about 45 ° is preferable. Used for. In such a case, it is possible to position the largest number of LED elements on the center line of the array of LED packages and gradually reduce the number of LED elements from the center line in the lateral direction. Can be collected in a narrow line shape, and uneven irradiance in the lateral direction can be eliminated. For this reason, it becomes possible to condense the light from the LED package so that the irradiance is sufficient to cure the adhesive by irradiating the adhesive with ultraviolet rays.

  According to the present invention having such a configuration, it is possible to irradiate the work with uniform light from which unevenness in irradiance in the horizontal direction is eliminated.

1 is an overall perspective view of a line light irradiation apparatus according to an embodiment of the present invention. Sectional drawing of the height direction of the line light irradiation apparatus which concerns on the same embodiment. The whole perspective view of the light emitting unit in the embodiment. The top view of the LED package in the embodiment. Sectional drawing of the height direction of the LED package in the embodiment. The partial top view of the light emission unit in the embodiment. The figure which shows the irradiance distribution of the horizontal direction of the light emission unit in the embodiment. The fragmentary top view of the light emission unit in other embodiment. The top view of the LED package in other embodiment. The conceptual diagram which shows the principal part of the line light irradiation apparatus which concerns on other embodiment. The whole perspective view of the conventional light emission unit. The partial top view of the conventional light emission unit. The figure which shows the irradiance distribution of the horizontal direction of the conventional light emission unit.

  An embodiment of the present invention will be described below with reference to the drawings.

  The line light irradiation apparatus 1 according to the present embodiment is used, for example, for irradiating an adhesive or the like with ultraviolet rays to be cured. Specifically, as shown in FIGS. A light emitting unit 3 in which a plurality of LED packages 32 are mounted in a row on a belt-like printed wiring board 31, and a rod lens 4 provided on the top of the light emitting unit 3 are provided. In the following description, the arrangement direction of the LED packages 32 is also referred to as a vertical direction, the direction orthogonal to the vertical direction and orthogonal to the side plates 22 and 23 of the casing 2 is the horizontal direction, orthogonal to the vertical direction and the casing 2. The direction perpendicular to the bottom plate 21 is also called the height direction.

Each part is described in detail below.
As shown in FIGS. 1 and 2, the casing 2 accommodates the light emitting unit 3, the rod lens 4, and the protection plate 6. Specifically, the casing 2 is made of a long metal and has a substantially U-shaped cross section perpendicular to the longitudinal direction (stretching direction). From the bottom plate 21 extending in the longitudinal direction and both longitudinal sides of the bottom plate 21 It has a pair of left and right side plates 22 and 23 extending upward. The casing 2 is an integral one formed by extrusion or pultrusion, and a plurality of heat radiation fins F for releasing heat from the light emitting unit 3 to the outside are provided on the back surface of the bottom plate 21 along the longitudinal direction. . Further, the bottom plate 21 and the left and right side plates 22 and 23 are provided with mounting grooves 2M for mounting the line light irradiation device 1 to an external member (for example, a rack or the like). Further, end plates 24 and 25 are fixed to one end and the other end of the casing 2 in the longitudinal direction by screws or the like. As a result, the casing 2 is formed with a substantially rectangular light exit 2H at the top. An electric cable 8 for supplying power to the LED package 32 extends from the end plate 25.

  As shown in FIGS. 3 and 6, the light emitting unit 3 has a plurality of LED packages 32 mounted on the surface of a belt-like printed wiring board 31 in a substantially straight line with the optical axes aligned in a certain direction. It is.

  As shown in FIGS. 4 and 5, the LED package 32 includes a base body 321 having a recess opening in the upper end surface, an LED element 322 mounted on the bottom surface of the recess, and a sealing portion 323 that seals the LED element 322. And.

  The base 321 has a concave portion that opens at the upper end surface, and examples thereof include those formed by molding an insulating material having high thermal conductivity such as alumina or aluminum nitride.

  The base body 321 mounts an LED element 322, which will be described later, on the bottom surface of the recess, and a wiring conductor (not shown) for electrically connecting the LED element 322 is formed on the bottom surface. Yes. This wiring conductor is led to the outer surface of the LED package 32 via a wiring layer (not shown) formed inside the base 321 and connected to the external electric circuit board, whereby the LED element 322 and the external electric circuit board are connected. Are electrically connected.

  A metal thin film having a high reflectance is formed on the inner surface of the concave portion of the base 321 by applying metal plating such as silver, aluminum, and gold, and functions as a reflector. The concave portion of the base body 321 is configured to gradually expand toward the opening, and is configured such that light reflected by the side surface of the concave portion is easily led out of the LED package 32.

  The LED element 322 is flip-chip mounted using a solder bump, a gold bump, or the like (not shown) on the bottom surface of the concave portion with the gallium nitride compound semiconductor facing down (the bottom surface side of the concave portion). In the present embodiment, four LED elements 322 are mounted on the LED package 32.

  The sealing portion 323 is filled in the concave portion of the base 321 and seals the LED element 322 therein. The sealing portion 323 is excellent in translucency and heat resistance and has a small refractive index difference with the LED element 322. It consists of a stopper or glass.

  In this embodiment, the arrangement direction of the LED package 32 and the vertical and horizontal arrangement directions of the LED elements 322 (in the drawing, the first direction and the second direction. Note that the first direction and the second direction are opposite. The LED package 32 is disposed so that the arrangement direction of the LED packages 32 and the vertical and horizontal arrangement directions of the LED elements 322 intersect at an angle of approximately 45 °.

  The rod lens 4 is a condensing lens having a substantially circular shape with an equal cross section having substantially the same length as the length in the longitudinal direction of the left and right side plates 22 and 23 of the casing 2. The rod lens 4 is provided in the casing 2 along the longitudinal direction above the light emitting unit 3 and is fixed to a plurality of LED packages 32 mounted on the light emitting unit 3 so as to be in a predetermined position. Specifically, the rod lens 4 is fixed so that the optical axis C2 of the rod lens 4 and the optical axis C1 of the plurality of LED packages 32 coincide with each other and the rod lens 4 is separated from the plurality of LED packages 32 by a predetermined distance. A protective plate 6 is provided in front (upper part) of the light emitting side of the rod lens 4, and this protective plate 6 is thermally expanded, so that slide grooves formed on the inner surfaces of the left and right side plates 22 and 23 are provided. 7 is installed with some play.

  According to the line light irradiation device 1 according to the present embodiment configured as described above, the arrangement direction of the LED packages 32 and the vertical and horizontal arrangement directions of the LED elements 322 intersect with each other at an angle of about 45 °. Since the most LED elements 322 are positioned on the center line of the array, and the number of LED elements 322 can be gradually reduced from the center line in the lateral direction, as shown in FIG. Can be collected in a thin line shape, and uneven irradiance in the lateral direction can be eliminated. For this reason, it becomes possible to condense the light from LED package 32 so that it may become sufficient irradiance in order to irradiate an adhesive agent etc. with an ultraviolet-ray and to cure.

  The present invention is not limited to the above embodiment.

  For example, as shown in FIG. 8, the LED package 32 may be inclined and disposed so that the four LED elements 322 are positioned at equal intervals in the lateral direction. By disposing the LED package 32 in this way, wider line-shaped light can be emitted without uneven irradiance in the lateral direction.

  When the embodiment shown in FIG. 6 is compared with the embodiment shown in FIG. 8, the peak value of irradiance is larger in the embodiment shown in FIG. 6, but the integrated value of irradiance is the embodiment shown in FIG. Is bigger.

  The minimum peak value of ultraviolet irradiance necessary to cure the adhesive varies depending on the type of adhesive. In order to cure the adhesive, if there is a minimum peak value that can cure the adhesive, the adhesive can be cured faster as the integral value of the irradiance is larger. For this reason, the embodiment shown in FIG. 8 is more suitable depending on the type of adhesive. In particular, the embodiment shown in FIG. 8 is for irradiating ultraviolet rays onto an irradiation target being conveyed like a copying machine, for example, and has a wide area for curing an adhesive, and is suitable for a case where a curing speed is required. .

  As described above, according to the present invention, the magnitude of the peak value of the irradiance and the magnitude of the integrated value of the irradiance can be controlled only by adjusting the arrangement angle of the LED package.

  Further, as shown in FIG. 9, the number of LED elements 322 mounted on the LED package 32 is not particularly limited, and may not be four (see FIG. 9A), and not n × n. The number may be n × m (n and m represent different integers) (see FIG. 9B).

  The long condensing member in the present invention is not limited to a lens, and may be a reflector member 4 ′ having a long reflecting surface as shown in FIG. 10, for example. In the embodiment shown in FIG. 10, the inner side surface 4′a of the reflector member 4 ′ made of metal or resin is made into a mirror surface by vapor deposition surface processing so as to function as a cylindrical concave reflection surface that reflects light from the LED package 32. .

  The elliptic curve A constituting the cylindrical concave reflecting surface formed on the inner surface 4'a of the reflector member 4 'has two focal points, and the opening S1 is located at one focal point (first focal point) F1. Thus, the slit S is arranged, and the irradiation surface 10 is arranged in a state substantially orthogonal to the axis C3 so that the irradiation target point is located at the other focal point (second focal point) F2.

  In addition, the present invention is not limited to the above-described embodiments, and may be configured by appropriately combining some or all of the various configurations described above without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Line light irradiation apparatus 31 ... Printed wiring board 32 ... LED package 322 ... LED element

Claims (2)

A line provided with a light emitting unit in which a plurality of LED packages are arranged in a line along the longitudinal direction on a long substrate, and a long light collecting member provided along the longitudinal direction on the light emitting unit. A light illumination device,
The LED package has a plurality of LED elements arranged at predetermined intervals so as to be positioned on intersections of the grid along a first direction and a second direction different from the first direction;
A line light illuminating device, wherein an arrangement direction of the LED packages is different from a first direction and a second direction in which the LED elements are arranged.   The line light illuminating device according to claim 1, wherein an arrangement direction of the LED packages intersects with a first direction and a second direction in which the LED elements are arranged at an angle of about 45 °.