JP2011124034A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system with small number of components and easy to manufacture. <P>SOLUTION: The lighting system 10 is provided with five LEDs 31 which emit light frontward, five lenses 41 which are arranged at the front of each LED 31 and have a main body part 42 of which diameter becomes large as it goes to the front, and a lens holder 51 of disk shape which holds five lenses 41 integrally. Three outer edge locking parts 44 which are formed in step shape both at the front side and the rear side are formed along the circumference direction in each lens 41. On the other hand, also in the inner circumference side face 52a of a holding hole 52 of the lens 51 on which the lens 41 is arranged, three inner edge locking parts 54 are formed in step shape both at the front side and the rear side along the circumference direction. By combining the outer edge locking part 44 and the inner edge locking part 54 complementarily along the circumference direction, each lens 41 is fixed to the lens holder 51. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lighting device configured by combining a semiconductor light emitting element such as a light emitting diode and a lens.

  2. Description of the Related Art In recent years, lighting devices such as downlights and spotlights that use small LEDs (Light Emitting Diodes) having excellent environmental compatibility as light sources have attracted attention. As an illuminating device using an LED, an illuminating device is known in which a light control lens having a substantially hemispherical shape (a bowl shape) is arranged in front of the LED (in the emission direction). By making the side surface of the lens into a parabolic curved shape so as to expand away from the LED, light emitted radially from the LED can be emitted forward from the exit surface of the lens as substantially parallel light (for example, Patent Document 1).

  In a lighting device (LED lighting fixture) disclosed in Patent Document 1, a lens having the above-described configuration is directly fixed to an LED (LED package) formed in a rectangular parallelepiped box shape in which an LED chip is accommodated. On the other hand, a lighting device has been reported in which a plurality (the same number) of lenses are integrated and arranged in front of a plurality of LEDs by using a lens holding mechanism that integrally holds a plurality of lenses (for example, a patent). Reference 2).

  FIGS. 6A and 6B show an LED illumination lamp disclosed in Patent Document 2 as a conventional example of an illumination apparatus including a lens holding mechanism that holds a plurality of lenses integrally. In the example shown in FIG. 6A, a lens (condensing lens) 103 is disposed in front (upper in the drawing) of a plurality (two) of LED chips 102 mounted on a circuit board (wiring board) 101, respectively. . A flange portion 103 a is formed on the upper outer peripheral surface of the lens 103, and the flange portion 103 a is sandwiched between the upper surface of the lens holder 104 and the collar portion of the decorative plate 105. Accordingly, the plurality of lenses 103 are integrally held (locked) by one lens holder 104.

  In the example shown in FIG. 6B, the flange portion 103a of the lens 103 is fitted in a flange portion fitting groove 114a formed in the circumferential direction on the inner peripheral surface of the cylindrical lens holder 114. By doing so, a plurality (two) of lenses 103 are held by the individual lens holders 114. A plurality (two) of lens holders 114 that respectively hold the lenses 103 are integrally held by a decorative plate 115.

JP 2007-59618 A JP 2007-220465 A

  The illumination device disclosed in Patent Document 2 has an excellent effect of having a function as an interior as well as a function as an illumination by disposing a decorative plate on the forefront surface side.

  However, when attention is paid to the function as a lens holding mechanism that holds a plurality of lenses integrally, there are problems in the following points. That is, in the conventional example shown in FIG. 6A, two members, a lens holder and a decorative plate, are required to hold the lens. For this reason, the number of members increases, and it becomes difficult to reduce the manufacturing cost.

  On the other hand, in the conventional example shown in FIG. 6B, assuming that the lens holder is molded by an injection molding method suitable for mass production, a groove extending in the circumferential direction on the inner peripheral surface unless a special mold is used. It is generally difficult to form the (flange fitting groove). In particular, when it is assumed that a plurality of lenses are held by one lens holder, a further difficulty is expected.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide an illumination device that has a small number of parts and is easy to manufacture.

  Therefore, in order to solve the above-described problem, an illumination device according to the present invention includes a light emitting element that emits light forward, and a lens that is disposed in front of the light emitting element and has a main body that increases in diameter toward the front. A flat lens holder having a holding hole for holding the lens, wherein the lens has an outer edge front seat portion having a pair of surfaces extending in the circumferential direction along an outer edge on the front side thereof, And a plurality of outer edge locking portions each having an outer edge rear seat portion formed rearwardly and circumferentially shifted with respect to the outer edge front seat portion, and having a pair of surfaces extending in the circumferential direction, and holding the lens holder The hole is formed with an inner edge front seat portion having a pair of surfaces extending in the circumferential direction along the inner edge and a pair of surfaces extending in the circumferential direction and being shifted rearward and circumferentially with respect to the inner edge front seat portion. Within A plurality of inner edge locking portions each including a rear seat portion, wherein the outer edge rear seat portion of the outer edge locking portion is disposed behind the inner edge front seat portion of the inner edge locking portion; By disposing the outer edge front seat portion of the outer edge locking portion in front of the inner edge rear seat portion, the lens is locked to the lens holder.

  According to the present invention, the lens disposed in front of the light emitting element is formed with a plurality of outer edge locking portions to be held by the lens holder along the outer edge of the front side (outgoing surface side). ing. The outer edge locking portion has a pair of surfaces extending in the circumferential direction (a front surface and a rear surface) and an outer edge front seat portion having a pair of surfaces extending in the circumferential direction, and rearward and circumferentially with respect to the outer edge front seat portion. And an outer edge rear seat portion formed by shifting. On the other hand, a plurality of (basically the same number as the outer edge locking portions) for holding the lens by engaging with the outer edge locking portion of the lens along the inner edge of the holding hole for arranging the lens of the lens holder. An inner edge locking portion is formed. Similarly to the outer edge locking portion, the inner edge locking portion includes an inner edge front seat portion having a pair of surfaces extending in the circumferential direction, and a pair of surfaces extending in the circumferential direction and rearward and circumferential in relation to the inner edge front seat portion. And an inner edge rear seat portion formed so as to be shifted from each other. That is, an outer edge locking portion and an inner edge locking portion formed in a bowl shape and a step shape along the circumferential direction are formed on the outer edge of the lens and the inner edge of the holding hole of the lens holder, respectively.

  And the outer edge rear seat part of the outer edge latching part is arranged behind the inner edge front seat part of the inner edge latching part, and the outer edge front seat part of the outer edge latching part is arranged in front of the inner edge rear seat part of the inner edge latching part. By doing so, the lens is held by the lens holder. In other words, the lens is held by the lens holder by complementarily combining the outer edge locking portion and the inner edge locking portion formed in a step shape along the circumferential direction.

  Thus, in the present invention, a plurality of lenses are held by only one lens holder. Thereby, the number of parts can be reduced and the manufacturing cost can be reduced. Further, an inner edge locking portion for holding the lens, which is formed on the inner edge of the holding hole of the lens holder, is formed in a bowl shape, and has a structure that does not have a groove unlike the prior art. For this reason, the lens holder can be easily used by using a normal movable mold (upper mold and lower mold in the case of a vertical molding machine) without using a mold having a special mechanism. Can be molded. Further, even when the lighting device is mounted on the ceiling as a downlight, for example, the lens can be exchanged or the position of the lens can be adjusted for each lens.

  In a preferred embodiment of the present invention, a concave portion is formed on one of the surfaces where the outer edge locking portion of the lens and the inner edge locking portion of the lens holder face each other, and the concave surface is engaged with the other surface. The convex part to be formed is formed.

  According to this invention, by engaging the convex part formed on the other side with the concave part formed on either the outer edge locking part or the inner edge locking part, the circumferential direction of the lens with respect to the lens holder Positioning and fixing can be performed reliably and easily.

  In addition, the lighting device according to the present invention includes a light emitting element that emits light forward, a lens that is disposed in front of the light emitting element and has a main body that increases in diameter toward the front, and a holding hole that holds the lens. A plurality of outer edge latches each having a stair-shaped front surface and a rear surface along the outer edge of the exit surface, which is the front surface of the lens device. The holding hole of the lens holder includes a plurality of inner edge locking portions each having a stepped front surface and a rear surface along an inner edge thereof, and the outer edge locking portion and the inner edge locking portion. Are complementarily combined along the circumferential direction to lock the lens to the lens holder.

It is a partially exploded perspective view which shows the example of whole structure of the illuminating device which concerns on embodiment of this invention. It is principal part sectional drawing which shows the assembly state of the same illuminating device. It is the perspective view which shows the structural example of the lens of the illumination device, (a) is the perspective view seen from the front side, (b) is the perspective view seen from the back side. It is a partial expansion perspective view which shows the principal part structural example of the lens holder of the illumination device. (A) and (b) are plane development schematic diagrams for demonstrating the process of assembling the lens to the lens holder. (A) (b) is sectional drawing which shows the structural example of the conventional illuminating device.

  Hereinafter, a lighting device 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the lighting device 10 includes a flat base 11, a plurality (five in the present embodiment) of circuit boards 21 disposed on the base 11, and a plurality of circuit boards 21. LED 31 as a plurality of (5) light-emitting elements mounted on each of the LEDs, a plurality of lenses 41 (five, only one is shown in FIG. 1) arranged for each of the five LEDs 31, and a plurality of A flat lens holder 51 that holds the lens 41 and is disposed in parallel with the base 11, and a plurality (three) of columns 61 that support the lens holder 51 on the base 11 are provided.
Hereinafter, a direction orthogonal to the plane of the base 11 is defined as an “axis (optical axis) direction”. A direction in which the base 11 faces the lens holder 51 along the axial direction is defined as “front”, and a direction opposite to “front” is defined as “rear”.

  The base 11 has a function as a heat sink. In this embodiment, the base 11 is formed in a rectangular shape in plan view using aluminum. A plurality (three) of screw holes (not shown) for fixing the column 61 are formed in the upper surface 11a of the base 11.

Next, in this embodiment, the circuit board 21 is an FPC (Flexible
Printed Circuit Board (flexible printed circuit board). The five circuit boards 21 are arranged at equal intervals on the virtual same circumference on the upper surface 11a of the base 11, and are connected in series with the adjacent circuit boards 21 by wires (not shown). The connection method may be a parallel connection. Further, circuit wiring may be directly formed on the upper surface 11a of the base 11 via an insulating layer.

  Next, the LED 31 is a pseudo white color formed by combining a blue LED chip that emits blue light (wavelength of 410 nm to 480 nm) and a yellow phosphor that receives blue light emitted from the blue LED and emits yellow component light. LED. The LED 31 is configured to emit white light mainly toward the front. The LED 31 is not limited to the pseudo white LED, and the phosphor is not limited to the yellow phosphor.

  Next, the lens 41 is molded using a transparent resin (polycarbonate in this embodiment). As shown in FIGS. 3A and 3B, the lens 41 includes a main body portion 42 formed in a solid bowl shape and an emission portion 43 formed in a cylindrical flat plate shape on the front side of the main body portion 42. ing.

  The main body 42 has a substantially parabolic curved reflecting surface 42a formed on its outer surface so as to expand from the rear toward the front. Further, a substantially cylindrical cavity 42b extending forward is formed at the center of the rear surface of the main body 42. The front side portion of the LED 31 is disposed in the cavity 42b. Thereby, the light emitted from the LED 31 can be efficiently taken into the lens 41. The light taken into the lens 41 travels toward the emitting portion 43 while being directly or totally reflected by the reflecting surface 42a.

  The emitting portion 43 has a circular emitting surface 43a that emits light on its outer surface, and a circumferential emitting portion formed so as to connect the front periphery of the reflecting surface 42a and the outer periphery of the emitting surface 43a. It has an outer peripheral side surface 43b. In the present embodiment, the thickness (axial dimension) of the emitting portion 43 is the same as the thickness of the lens holder 51.

  The exit surface 43a is a flat surface orthogonal to the axial direction as a whole, but a plurality of minute domes (not shown) are formed over the entire surface. By forming a minute dome having an appropriately adjusted height on the emission surface 43a, the emission direction of light emitted from the emission surface 43a can be adjusted.

  A plurality (three) of outer edge locking portions 44 are formed at equal intervals along the circumferential direction on the outer peripheral side surface 43b of the emitting portion. Each outer edge locking portion 44 is formed so as to be shifted rearward and circumferentially (counterclockwise as viewed from above, counterclockwise) with respect to the outer edge front seat 45 formed on the emission surface 43a side and the outer edge front seat 45. It is comprised from the outer edge back seat part 46 made.

  The outer edge front seat portion 45 is formed in a bowl shape projecting radially outward in a predetermined angle range along the circumferential direction. The outer edge front seat 45 has, as outer surfaces, a front surface 45a that is a front surface, a rear surface 45b that faces the front surface 45a in parallel, and an end surface on the clockwise side of a pair of end surfaces that face in the circumferential direction. A positive-side end surface 45c, a counter-side end surface 45d that is a counterclockwise end surface facing the positive-side end surface 45c in the circumferential direction, and an outer peripheral surface 45e that is an arc surface having a constant curvature and facing radially outward. Have. In the present embodiment, the front surface 45a is formed flush with the emission surface 43a.

  The outer edge rear seat 46 is formed in a bowl shape projecting radially outward in a predetermined angle range along the circumferential direction. The outer edge rear seat 46 has the same overhang dimension (diameter dimension) and thickness (axial dimension) as the outer edge front seat 45, but the circumferential length is larger than the circumferential length of the outer edge front seat 45. Is also set short.

  In addition, the outer edge rear seat 46 has, as outer surfaces, a front surface 46a that is a front surface, a rear surface 46b that faces the front surface 46a in parallel, and a clockwise side of a pair of end surfaces that face in the circumferential direction. A positive side end face 46c, a counter side end face 46d which is a counterclockwise end face facing the positive side end face 46c in the circumferential direction, and an outer peripheral face 46e which is an arc surface having a constant curvature and facing radially outward. ,have. The front surface 46a of the outer edge rear seat portion 46 is formed so that the axial position of the rear surface 45b of the outer edge front seat portion 45 is the same (located on the same virtual plane). A part of the front surface 46 a on the positive side end face 46 c side of the outer edge rear seat part 46 is formed so as to overlap a part of the rear face 45 b of the outer edge front seat part 45 on the opposite side end face 45 d side.

  The outer edge locking portion 44 configured in this manner is exposed to the outside among the front surface 45a of the outer edge front seat portion 45, the opposite side end surface 45d of the outer edge front seat portion 45, and the front surface 46a of the outer edge rear seat portion 46. And a front step surface 44A formed in a step shape (crank shape) with respect to the circumferential direction by a portion (a portion not overlapping with the rear surface 45b of the outer edge front seat portion 45). Further, the outer edge locking portion 44 includes a portion of the rear surface 45b of the outer edge front seat portion 45 exposed to the outside (a portion that does not overlap the front surface 46a of the outer edge rear seat portion 46) and the positive side of the outer edge rear seat portion 46. A rear step surface 44 </ b> B is formed in a step shape with respect to the circumferential direction by the end surface 46 c and the rear surface 46 b of the outer edge rear seat 46. And the outer edge latching | locking part 44 is formed in the step shape as a side view as a whole (refer FIG. 5 (a) (b) mentioned later).

  Further, each outer edge locking portion 44 has a protrusion 47 formed on the rear surface 45b of each outer edge front seat 45. The protrusion 47 is engaged with a recess 57 formed in the lens holder 51 described later.

  Further, a space (interval in the circumferential direction) is provided between the adjacent outer edge locking portions 44 and 44 (between the positive side end surface 45c and the opposite side end surface 46d as viewed from above). The circumferential length of the space is set to be slightly longer than the circumferential length of the inner edge front seat portion 55 of the inner edge locking portion 54 to be described later in the lens holder 51 (the circumferential length of the inner edge rear seat portion 56). Set significantly shorter). This is for enabling the work of assembling the lens 41 to the lens holder 51. A method for fixing the lens 41 to the lens holder 51 will be described later.

  Next, the lens holder 51 is formed into a disk shape using an opaque resin (in this embodiment, white ABS (Acrylonitrile Butadiene Styrene) resin). The lens holder 51 has a plurality (five) of holding holes 52 that respectively hold the five lenses 41, and a plurality of (three) small holes (not shown) through which bolts 63 constituting a post 61 described later are inserted. Are formed penetrating in the thickness direction (axial direction).

  The holding hole 52 is formed in a circular shape, and the diameter thereof is the outer diameter of the outer edge locking portion 44 of the lens 41 (the diameter of a virtual circumferential surface that extrapolates the plurality of outer circumferential surfaces 45e and the plurality of outer circumferential surfaces 46e). They are the same or slightly larger.

  On the inner peripheral side surface 52a of each holding hole 52, a plurality of (three as the outer edge locking portions 44 of the lens 41) inner edge locking portions 54 are formed at equal intervals along the circumferential direction. Each inner edge locking portion 54 is formed with an inner edge front seat portion 55 formed forward and an inner edge formed so as to be shifted rearward and circumferentially (counterclockwise as viewed from above) with respect to the inner edge front seat portion 55. The rear seat portion 56 is configured.

  The inner edge front seat portion 55 is formed in a bowl shape projecting radially inward within a predetermined angle range along the circumferential direction. The inner edge front seat portion 55 includes, as outer surfaces, a front surface 55a that is a front surface, a rear surface 55b that faces the front surface 55a in parallel, and a clockwise end surface of a pair of end surfaces that face in the circumferential direction. A positive side end surface 55c, a counter side end surface 55d which is a counterclockwise end surface facing the positive side end surface 55c in the circumferential direction, an inner peripheral surface 55e which is an arc surface having a constant curvature and facing radially inward, have.

  The inner edge front seat portion 55 has an inner diameter (a diameter of a virtual circumferential surface that extrapolates the inner peripheral surface 55e of the inner edge front seat portion 55) equal to or larger than the diameter of the emitting portion outer peripheral side surface 43b of the lens 41. It is formed slightly larger. In addition, the front surface 55a of the inner edge front seat portion 55 is formed flush with the front plane 51a that is a plane on the front side of the lens holder 51 in the present embodiment.

  The inner edge rear seat portion 56 is formed in a bowl shape projecting radially inward within a predetermined angle range along the circumferential direction. The inner edge rear seat portion 56 has the same extension dimension and thickness as the inner edge front seat portion 55, but the circumferential length is set longer than the circumferential length of the inner edge front seat portion 55. In the present embodiment, the overhang dimension and thickness of the inner edge front seat portion 55 and the inner edge rear seat portion 56 are the same as the overhang dimension and thickness of the outer edge front seat portion 45 and the outer edge rear seat portion 46 of the lens 41. Further, the circumferential length of the inner edge front seat portion 55 is substantially the same as the circumferential length of the outer edge rear seat portion 46 of the lens 41, and the circumferential length of the inner edge rear seat portion 56 is the outer edge front seat of the lens 41. The circumferential length of the portion 45 is substantially the same.

  The inner edge rear seat portion 56 has, as outer surfaces, a front surface 56a that is a front surface, a rear surface 56b that faces the front surface 56a in parallel, and a clockwise end surface of a pair of end surfaces that face in the circumferential direction. A positive side end surface 56c, a counter side end surface 56d that is a counterclockwise end surface facing the positive side end surface 56c in the circumferential direction, an inner peripheral surface 56e that is an arc surface having a constant curvature and facing radially inward, have. The front surface 56 a is formed so as to have the same axial position with respect to the rear surface 55 b of the inner edge front seat portion 55. A part of the front surface 56 a of the inner edge rear seat part 56 on the positive side end face 56 c side is formed so as to overlap with a part of the rear face 55 b of the inner edge front seat part 55 on the opposite side end face 55 d side.

  The inner edge locking portion 54 configured in this manner is exposed to the outside among the front surface 55 a of the inner edge front seat portion 55, the opposite side end surface 55 d of the inner edge front seat portion 55, and the front surface 56 a of the inner edge rear seat portion 56. And a front step surface 54 </ b> A formed in a step shape with respect to the circumferential direction by a portion (a portion that does not overlap with the rear surface 55 b of the inner edge front seat portion 55). Further, the inner edge locking portion 54 includes a portion of the rear surface 55 b of the inner edge front seat portion 55 exposed to the outside (a portion not overlapping the front surface 56 a of the inner edge rear seat portion 56) and the positive side of the inner edge rear seat portion 56. A rear step surface 54 </ b> B is formed in a step shape with respect to the circumferential direction by the end surface 56 c and the rear surface 56 b of the inner edge rear seat portion 56. And the inner edge latching | locking part 54 as a whole is formed in the step shape seeing the side (refer FIG. 5 (a) (b) mentioned later).

  In this manner, the outer edge locking portion 44 of the lens 41 similarly configured in a step shape is complementarily combined (engaged) along the circumferential direction with the inner edge locking portion 54 configured in a step shape. The lens 41 can be fixed to the lens holder 51, details of which will be described later.

  Each inner edge locking portion 54 is formed with a recess 57 on the front surface 56 a of each inner edge rear seat portion 56. As described above, the recess 57 is engaged with the protrusion 47 formed on the lens 41.

  Further, a space (interval in the circumferential direction) is placed between the adjacent inner edge locking portions 54 and 54 (between the positive side end surface 55c and the opposite side end surface 56d when viewed from above). The circumferential length of this space is set slightly longer than the circumferential length of the outer edge rear seat 46 of the lens 41 (it is set to be significantly shorter than the circumferential length of the outer edge front seat 45). . This is for enabling the work of assembling the lens 41 to the lens holder 51.

  Next, in this embodiment, the column 61 includes a cylindrical pipe 62 that functions as a spacer, and a bolt 63 that is inserted inside the pipe 62 and connects the base 11 and the lens holder 51. By positioning and fixing the lens holder 51 on the base 11 using the support 61, each lens 41 fixed to the lens holder 51 is optically aligned with each LED 31.

  Next, an example of a method for fixing the lens 41 to the holding hole 52 of the lens holder 51 will be described with reference to FIGS. 5A and 5B, a part of the outer edge locking portion 44 of the lens 41 and the inner edge locking portion 54 of the lens holder 51 are shown in a plane development.

  First, the lens 41 is disposed from the front plane 51 a side of the lens holder 51 with respect to the holding hole 52 of the lens holder 51. At this time, since at least a part of the outer edge locking portion 44 of the lens 41 is placed on the inner edge locking portion 54 of the lens holder 51, the lens 41 does not fall out of the holding hole 52. Next, the lens 41 is rotated, and the outer edge rear seat portion 46 of the lens 41 is fitted to the rear side of the space between the adjacent inner edge engaging portions 54 of the lens holder 51 as shown in FIG. When the outer edge rear seat portion 46 of the lens 41 fits in the space between the adjacent inner edge locking portions 54, the inner edge front seat portion 55 of the lens holder 51 moves to the front side of the space between the adjacent outer edge locking portions 44 of the lens 41. Fits into. Then, at least a part of the outer edge front seat portion 45 of the lens 41 is placed on the front surface 56 a side of the inner edge rear seat portion 56 of the lens holder 51.

  Next, while pushing the lens 41 backward with respect to the lens holder 51 (elastically deforming the outer edge locking portion 44 and the inner edge locking portion 54), the lens 41 is rotated counterclockwise, and the outer edge rear seat 46 of the lens 41 is rotated. The portion on the side opposite to the end face 46 d is disposed behind the inner edge front seat portion 55 of the adjacent inner edge locking portion 54 in the lens holder 51. Thus, the movement of the lens 41 with respect to the axial direction is restricted by engaging the outer edge locking portion 44 of the lens 41 and the inner edge locking portion 54 of the lens holder 51 along the circumferential direction.

  Then, the lens 41 is further rotated, and as shown in FIG. 5 (b), the protrusion 47 formed on the outer edge front seat portion 45 of the lens 41 is formed in the concave portion formed on the inner edge rear seat portion 56 of the lens holder 51. 57. By fitting the protrusion 47 into the recess 57, the rotational movement of the lens 41 is restricted, and the operation of positioning and fixing the lens 41 to the lens holder 51 is completed. In this state, the rear surface 45b of the outer edge front seat portion 45 of the lens 41 and the front surface 56a of the inner edge rear seat portion 56 of the lens holder 51 are in surface contact with each other, and the front of the outer edge rear seat portion 46 of the lens 41 is in front. The direction surface 46a and the rear surface 55a of the inner edge front seat portion 55 of the lens holder 51 are in surface contact with each other.

  In the illumination device 10 configured as described above, the light emitted from the five LEDs 31 is controlled from the emission surface 43a of the lens 41 to the object to be illuminated while the emission direction is controlled by each lens 41, as in the related art. It can be made to emit toward. Below, the specific effect which the illuminating device 10 which concerns on embodiment of this invention show | plays is demonstrated.

  The illuminating device 10 includes three outer edge locking portions 44 formed on the outer peripheral side surfaces 43b of the five lenses 41 and three inner peripheral side surfaces 52a of the five holding holes 52 of the lens holder 51, respectively. The inner edge locking portions 54 are each formed in a step shape along the circumferential direction. The five lenses 41 are fixed to the lens holder 51 by complementarily combining the outer edge locking portions 44 and the inner edge locking portions 54 along the circumferential direction. As described above, the illumination device 10 holds the plurality of lenses 41 by only one lens holder 51. Thereby, the number of parts is reduced and the cheap illuminating device 10 is realizable. In addition, the illumination device 10 can change the lens or adjust the position of the lens for each lens 41 even in a state where the top and bottom are reversed (for example, a state where the lighting device 10 is attached to the ceiling as a downlight).

  Further, the inner edge locking portion 54 formed on the lens holder 51 is formed in a bowl shape and a step shape, and has a structure that does not have a groove required in the prior art. For this reason, the lens holder 51 can be easily molded by an injection molding method or the like without using a mold having a special mechanism. For this reason, the manufacturing cost of the lens holder 51, and hence the manufacturing cost of the illumination device 10 can be reduced, and the inexpensive illumination device 10 can also be realized in this respect.

  Further, the lighting device 10 is provided with a protrusion 47 on the outer edge locking portion 44 of the lens 41 (the rear surface 45b of the outer edge front seat portion 45), and the inner edge locking portion 54 (the front surface of the inner edge rear seat portion 56) of the lens holder 51. 56a) is provided with a recess 57 into which the protrusion 47 is fitted. Thereby, positioning and fixing of the lens 41 in the circumferential direction with respect to the lens holder 51 can be reliably and easily performed.

  In the illumination device 10, an inner edge locking portion 54 made of a white resin and an outer edge locking portion 44 made of a transparent resin are alternately arranged in the circumferential direction on the outer edge side of the emission surface 43 a of the lens 41. Has been placed. For this reason, there was a concern that the brightness of the illumination light would be uneven in the circumferential direction, but such a phenomenon was not confirmed. This is because the outer edge locking portion 44 of the lens 41 is formed outside the maximum outer diameter of the main body portion 42 of the lens 41, so that almost no light is incident on the outer edge locking portion 44. It is considered a thing.

  As another reason, the circumferential length of the outer edge rear seat portion 46 of the lens 41 is shorter than the circumferential length of the outer edge front seat portion 45, that is, adjacent inner edge locking portions 54, 54 of the lens holder 51. It is conceivable that the circumferential length of the space between them is shorter than the circumferential length of the inner edge locking portion 54 (the circumferential length of the space between the adjacent inner edge locking portions 54, 54 is the lens 41. The outer edge rear seat 46 is set to be slightly longer than the circumferential length). The space between the adjacent inner edge locking portions 54 and 54 is a region through which light can be transmitted, but the circumferential length of the space through which light can be transmitted is set to the circumferential length of the light shielding region (inner edge locking portion 54). It is considered that the uniformity of the brightness of the illumination light is more difficult to be impaired by shortening the length.

  As mentioned above, although preferable embodiment of this invention was described, about embodiment, it is not limited above, A various change is possible in the range which does not deviate from the main point of this invention.

  For example, in the above embodiment, the protrusion 47 is provided on the outer edge locking portion 44 of the lens 41 and the recess 57 is provided on the inner edge locking portion 54 of the lens holder 51, but this is not limitative. A recess may be provided in the outer edge locking portion 44 and a protrusion may be provided in the inner edge locking portion 54.

  Further, in order to facilitate the engagement work between the protrusion 47 and the recess 57, for example, a guide groove whose depth becomes shallower toward the recess 57 is formed on the front surface 56a of the inner edge rear seat portion 56 of the lens holder 51. May be. In addition, the outer edge rear seat 46 of the lens 41 may be tapered on the side opposite to the end face 46d of the front face 46a or the front end face 55c of the rear face 55b of the inner edge front seat 55 of the lens holder 51.

  Further, the protrusion 47 and the recess 57 are not necessarily provided. In this case, for example, the frictional force (elastic force) between the contact surfaces of the outer edge locking portion 44 of the lens 41 and the inner edge locking portion 54 of the lens holder 51 may be used to fix (restrict rotation). . Further, the rear surface 55b of the inner edge front seat portion 55 of the lens holder 51 is a surface (inclined surface) that is gently inclined rearward with respect to the circumferential direction (inclined surface). You may fix so that the edge part of this may bite into the inclined surface. In this case, a protrusion may be formed on the front surface 46a of the outer edge rear seat 46, and the protrusion may be fixed so as to bite into the inclined surface. Moreover, you may fix using an adhesive agent auxiliary.

  Moreover, in the said embodiment, although the outer edge latching | locking part 44 of the lens 41 is formed so that a part of outer edge back seat part 46 may overlap with a part of outer edge front seat part 45, it is not limited to this. The outer edge front seat 45 and the outer edge rear seat 46 may be separated. The same applies to the inner edge locking portion 54 of the lens holder 51.

  Moreover, in the said embodiment, although the outer edge back seat part 46 is shifted counterclockwise with respect to the outer edge front seat part 45, the outer edge latching | locking part 44 of the lens 41 is formed, It is not limited to this. The outer edge locking portion 44 of the lens 41 may be formed by shifting the outer edge rear seat portion 46 in the clockwise direction with respect to the outer edge front seat portion 45. The same applies to the inner edge locking portion 54 of the lens holder 51.

  In the above embodiment, the outer edge locking portion 44 of the lens 41 is formed so that the axial position of the rear surface 45b of the outer edge front seat portion 45 and the axial position of the front surface 46a of the outer edge rear seat portion 46 coincide. However, it is not limited to this. When the outer edge locking portion 44 is formed so that the axial position of the rear surface 45b of the outer edge front seat 45 is different from the axial position of the front surface 46a of the outer edge rear seat 46, the outer edge locking portion 44 Of course, the shape of the inner edge locking portion 54 of the lens holder 51 to be complementarily combined can be appropriately changed.

10 Illumination Device 11 Base 21 Circuit Board 31 LED
41 Lens 42 Main body portion 42a Reflective surface 42b Cavity 43 Output portion 43a Output surface 43b Output portion outer peripheral side 44 Outer edge locking portion 45 Outer edge front seat portion 46 Outer edge rear seat portion 47 Projection 51 Lens holder 51a Front plane 52 Holding hole 52a Inner periphery Side surface 54 Inner edge locking portion 55 Inner edge front seat portion 56 Inner edge rear seat portion 57 Recess 61 Post

Claims (2)

A light emitting element that emits light forward;
A lens having a main body that is arranged in front of the light emitting element and has a diameter that increases toward the front;
In a lighting device comprising a flat lens holder having a holding hole for holding the lens,
The lens has a pair of surfaces extending in the circumferential direction along an outer edge on the front side thereof, and a pair of surfaces extending in the circumferential direction. The lens has a pair of surfaces extending in the circumferential direction and is rearward and circumferential in the circumferential direction. Including a plurality of outer edge locking portions composed of outer edge rear seats formed by shifting to
The holding hole of the lens holder has an inner edge front seat portion having a pair of surfaces extending in the circumferential direction along an inner edge thereof, and a rear surface with respect to the inner edge front seat portion having a pair of surfaces extending in the circumferential direction. Including a plurality of inner edge locking portions consisting of inner edge rear seats formed by shifting in the circumferential direction,
The outer edge rear seat part of the outer edge latching part is disposed behind the inner edge front seat part of the inner edge latching part, and the outer edge latching part is disposed in front of the inner edge rear seat part of the inner edge latching part. An illuminating device, wherein an outer edge front seat portion is arranged to lock the lens to the lens holder.   A concave portion is formed on any one of the surfaces where the outer edge locking portion of the lens and the inner edge locking portion of the lens holder face each other, and a convex portion that engages with the concave portion is formed on the other surface. The light source device according to claim 1.

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