JP2008226702A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device of a structure in which light distribution controlled by a general use LED and a lens is reflected by an optical reflecting part and emitted to the outside, and which has a superior light distribution by complementing the optically heterogeneous portion of the lens by the optical reflecting part. <P>SOLUTION: A level-difference extension portion 20, which is the level difference lower face 19 is provided at a position of equal angles on an identical circle with an engaging projection insertion hole 21 centered on an optical axis of an LED 2; and as a result, a similar optical condition as a dark spot generated in the engaging projection part 17 is provided at point symmetric positions with the optical axis X of the LED 2 as an object axis. As a result, the illumination light emitted from the lighting device forms a light distribution of substantially point symmetry without polarization, and a lighting lamp with proper appearance and aesthetics is obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an illuminating device, and more particularly to an illuminating device for general illumination or decorative illumination using an LED as a light source.

  In a lighting device using an LED as a light source, when it is necessary to make the irradiation direction of the LED light radially about the optical axis of the LED and perpendicular to the optical axis, as shown in FIG. The use of conventional LEDs is conceivable.

  That is, the LED chip 50 is resin-sealed with a translucent resin 51, and a part of a parabola E focusing on the LED chip 50 is disposed above the LED chip 50 in a vertical axis (optical axis) passing through the LED chip 50. A reflection lens portion 51 a having a shape rotated around V is formed, and a convex curve D focusing on the LED chip 50 is formed on a substantially lateral side of the LED chip 50 along a vertical axis (optical axis) V passing through the LED chip 50. A refraction lens portion 51b having a shape rotated around is formed.

  Then, the light emitted from the LED chip 50 and reaching the parabola E is reflected by the parabola E and irradiated as parallel parallel light radially in the horizontal axis H direction perpendicular to the optical axis. Further, the light emitted from the LED chip 50 and reaching the convex curve D is refracted by the convex curve D and irradiated as parallel light radially in the horizontal axis H direction perpendicular to the optical axis.

At this time, the reflection lens portion 51a and the refraction lens portion 51b are provided in close contact with each other, and the light emitted from the LED chip 50 is converted into parallel light that is continuously continuous in a radial pattern by the reflection lens portion 51a and the refraction lens portion 51b. It is said that it is irradiated as. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 6-11365

  In the LED, a lens portion for controlling the irradiation direction of light emitted from the LED chip is formed of an LED sealing resin, and the LED chip and the lens portion are integrally formed.

  By the way, there are a wide variety of lighting devices using LEDs as light sources, and designing and manufacturing an LED light source in which the LED chip and the lens unit are integrated so that each of the lighting devices can be individually handled is costly. It is hard to say that the method is preferable from the aspect.

  In addition, there is a limit to the size of resin sealing, and it is doubtful whether a lighting device that is optically satisfactory can be realized.

  Therefore, it is proposed that a general-purpose LED is used as a light source, and lenses corresponding to each of the lighting devices are individually designed and manufactured. The combination of the general-purpose LED and the lens suppresses the increase in cost and obtains the desired light distribution. It is something to try.

  However, even in this case, the shape of the lens is limited due to the mounting structure and the like, and an optically perfect lens cannot always be realized.

  Therefore, the present invention was devised in view of the above problems, and the object of the present invention is illumination having a configuration in which light distributed by a general-purpose LED and a lens is reflected by an optical reflecting portion and emitted to the outside. An object of the present invention is to provide an illumination device with good light distribution by complementing an optically different portion of a lens with an optical reflecting portion.

In order to solve the above problems, the invention described in claim 1 of the present invention is:
A substrate on which an LED serving as a light source is mounted;
A lens for introducing light emitted from the LED to control the optical path;
An illumination device including an optical reflecting portion having a plurality of upright reflecting columns that emit light emitted from the LEDs and guided through the lens and emitted from the lens in an irradiation direction,
The presence of a propagation restriction that partially restricts the propagation of light between the lens and the optical reflecting portion partially reduces the amount of light emitted from the lens and reaching the optical reflecting portion. When the reaching light amount reducing unit is formed in the optical reflecting unit, an optical state similar to the reaching light amount reducing unit of the optical reflecting unit is provided by providing a received light amount reducing unit at a regular position of the optical reflecting unit. It is provided at a regular position of the optical reflecting portion.

  The invention described in claim 2 of the present invention is that, in claim 1, the propagation restriction object is a locking projection that extends from the lens and locks the lens to the optical reflecting portion. It is a feature.

  According to a third aspect of the present invention, in any one of the first or second aspect, the received light amount reducing means is an end surface provided on a surface of the optical reflecting portion facing the lens. It is characterized by being.

  Moreover, the invention described in claim 4 of the present invention is that, in any one of claims 1 to 3, the upright reflecting column is in a direction opposite to the lens as the surface facing the lens goes upward. In addition, a metal film of any one of aluminum, silver, and chrome is formed on at least a surface that receives light emitted from the lens and is used as a reflection surface.

  Moreover, the invention described in claim 5 of the present invention is the optical reflection part according to any one of claims 1 to 4, wherein the optical reflection part has at least four joints with a housing that houses the optical reflection part. It is characterized by including a lighting device internal space connecting portion composed of a non-joining portion.

  In the illumination device of the present invention, the amount of light emitted from the lens and reaching the optical reflecting portion is partially due to the presence of a propagation restriction that partially restricts the propagation of light between the lens and the optical reflecting portion. In the case where the reaching light amount reducing unit is formed in the optical reflecting unit, the optical state similar to the reaching light amount reducing unit of the optical reflecting unit is obtained by providing a received light amount reducing unit at a regular position of the optical reflecting unit. The optical reflection portion is provided at a regular position.

  As a result, it is possible to provide an illumination device with good light distribution by complementing the optically different portion of the lens with an optical reflecting portion.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 13 (the same reference numerals are given to the same parts). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  FIG. 1 is an exploded view of an embodiment of a lighting device according to the present invention. An LED (surface mount type) 2 is mounted at the center of the printed circuit board 1, and a lead wire 3 connected from the printed circuit board 1 to an electrode pad (not shown) of the printed circuit board 1 is positioned below the printed circuit board 1. The gasket 4 and the housing 5 are inserted and extended.

  The gasket 4 is fitted into a gasket mounting hole 6 provided in the housing 5, and the printed circuit board 1 is fixed to the housing 5 with a tapping screw 7.

The optical reflecting portion 8 is located above the printed board 1, and the lens 9 is attached to the upper surface side of the central portion of the optical reflecting portion 8. The optical reflecting portion 8 is disposed on the housing 5, and the cover 10 and the rim 11 are sequentially fixed thereon.

  Next, details of the printed circuit board (including the mounted LED), the optical reflection unit 8 and the lens 9 constituting the optical system of the illumination device of the present invention, and the optical system constituted by them will be described.

  First, the printed circuit board 1 has a surface-mounted LED 2 mounted at the center. There may be one LED chip serving as the light source of the LED 2 or a plurality of LED chips that emit light of different colors. As the LED 2, a general-purpose LED that is generally used is sufficient. It is also possible to mount an LED chip directly on the printed circuit board 1 as a light source.

  2 is a top view of the lens 9, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB in FIG. The lens 9 is formed by injection molding of a light-transmitting material such as acrylic resin or polycarbonate resin, and has a substantially cylindrical shape. As shown in FIG. 3, the lower surface side of the lens 9 (side facing the LED 2 described later). Is provided with a convex portion 12 projecting downward at the center, and has a concave curved surface 13 formed of a spherical surface or an aspheric surface recessed inward at the central portion of the convex portion 12.

  The upper surface side of the lens 9 is centered on a part of a parabola that rises from a position on the center line X of the concave curved surface 13 (which is also an optical axis of the LED 2 described later) and has a direction perpendicular to the center line X as the main axis Y direction. A rotation paraboloid 14 obtained by rotating 180 ° around the line X is provided.

  Further, as shown in FIG. 4, a pair having a locking claw 16 at the front end portion of the lens 9 located around the convex portion 12 on the lower surface side of the lens 9. The locking projection 17 is provided.

  5 is a top view of the optical reflecting portion 8, FIG. 6 is a sectional view taken along the line CC in FIG. 5, and FIG. 7 is a sectional view taken along the line DD in FIG. The optical reflecting portion 8 is provided with a circular LED light passage hole 18 through which light from the LED 2 disposed below, as will be described later, is provided at the center, and has a radius R1 centered on the center of the LED light passage hole 18. The inner side of the circle forms a step lower surface 19 that is one step lower than the outer surface.

  Further, the step lower surface 19 is formed with a step extension portion 20 extending to a position of a radius R2 centering on the center with a predetermined width in a radial manner with the center of the LED light passage hole 18 as an apex.

  A pair of locking protrusion insertion holes 21 through which the locking protrusions are inserted are provided at positions where the stepped extension portions 20 should be located symmetrically with respect to the center of the LED light passage hole 18.

  A plurality of upright reflecting pillars 23 are arranged on the step upper surface 22 raised one step with respect to the step lower surface 19 and the step extension 20, and the arrangement positions thereof are different radii around the center of the LED light passage hole 18. Are located at equiangular positions with the center of the LED light passage hole 18 as the apex. The upright reflecting columns 23 a, 23 b, and 23 c on the concentric circles are in a positional relationship such that no other upright reflecting column is positioned on the line connecting the LED light passage holes 18.

  As for the shape of the upright reflecting column 23, the surfaces facing the center of the LED light passage hole 18 are the reflecting surfaces 24a, 24b and 24c, and the reflecting surfaces 24a, 24b and 24c are curved outward as they go upward.

  FIG. 8 shows the positional relationship among the printed circuit board 1 on which the LED 2 is mounted, the optical reflection unit 8, and the lens 9. A printed circuit board 1 in which the position of the LED 2 is set so that the optical axis X passes through the center of the LED light passage hole 18 provided in the optical reflection unit 8 is disposed below the optical reflection unit 8. The locking protrusion 17 of the lens 9 is inserted into the pair of locking protrusion insertion holes 21 provided, and the lens 9 is locked to the optical reflecting portion 8 by the locking claws 16.

  At this time, the light emitted from the LED 2 passes through the LED light passage hole 18 provided in the optical reflecting portion 8 and reaches the concave curved surface 13 of the lens 9 and is introduced into the lens 9 using the concave curved surface 13 as a light incident surface. The The light introduced into the lens 9 is guided through the lens 9 to reach the rotating paraboloid 14, and is reflected (totally reflected) by the rotating paraboloid 14 to become substantially parallel light. The light is guided through the lens 9 in parallel with the upper surface 22 and radially, and is emitted to the outside using the side surface 25 of the lens 9 as a light emitting surface.

  The light emitted from the lens 9 reaches the reflecting surfaces 24a, 24b, and 24c of the upright reflecting columns 23a, 23b, and 23c arranged concentrically, and is reflected by the reflecting surfaces 24a, 24b, and 24c and positioned above. The light is emitted out of the lighting device through the cover 10.

  The upper reflection surface of the lens 9 in FIG. 9 is formed in a shape that is responsible for total reflection of the light source light, but when observed from a direction other than the light source 2 or the upright reflecting column 23, for example, it is observed from the upper side in the figure. In this case, the lower surface is observed. In particular, in the vicinity of the locking projection 17, the locking projection 17 penetrates the optical reflecting portion 8, so that the back side of the optical reflecting portion 8 is observed, and the back side is not illuminated. Will be observed.

  For example, in the present embodiment, the locking projections 17 are provided at two places, and therefore two dark spots are observed when the lens 9 is observed from above. The occurrence of two dark spots on the circular lens 9 when viewed from the front makes the viewer feel uncomfortable and thus reduces the illumination quality of the product.

  In the present invention, by providing a plurality of pseudo dark spots with respect to this dark spot, the dark spots that are unavoidable due to the arrangement of the locking claws are incorporated into the intended design, and the observer is not discomforted. . Below the lens 9, a step lower surface 19 is formed which is formed by a stepped portion extension 20 that appears at a constant angular interval, including the locking projection 17 and the through hole.

  The lens 9 is mainly intended for light distribution by the upright reflecting columns 23 and is configured to perform light distribution substantially parallel to the step upper surface 22. Here, the distribution of light in the direction of the step bottom surface 19 of the lens 9 is less than the light distribution above the step top surface 22, and therefore, by providing an appropriate step, the step bottom surface 19 and the locking projection are provided. The same dark spot can be realized by the unit 17.

  That is, by providing the step extension portion 20 that is the step bottom surface 19 as shown in FIG. 10 at the same angle position on the same circle as the locking projection insertion hole 21 with the optical axis X of the LED 2 as the center, An optical state similar to a dark spot generated at the stop projection 17 was provided at a point-symmetrical position with the optical axis X of the LED 2 as the target axis. As a result, the illumination light emitted from the illumination device forms a substantially point-symmetrical light distribution without being biased, so that the illumination lamp has a good appearance and an excellent aesthetic appearance.

  In the present embodiment, four concave portions are provided in the contact portion of the optical reflecting portion 8 with the housing 5 to form a lighting device internal space connecting portion. This concave portion connects the lamp interior spaces that are largely divided into two regions by the optical reflecting portion 8.

  This lamp is assumed to be installed on the wall as a main application. However, when the lamp is installed on the wall, the air inside the lamp heated by the heat generated by the LED 2 rises and stays upward, and then the cover 10 Alternatively, heat is radiated through the housing 5 and the cooled air descends. At that time, if either the cover 10 or the housing 5 radiates more heat depending on the installation environment, the warm air and the cold air between the two regions that are largely divided by the optical reflector 8 by the four concave portions. Exchange occurs and heat circulation can be performed efficiently.

  The concave portions are most preferably provided at the uppermost portion and the lowermost portion. However, since the light distribution design of the lamp is configured as non-directional, it is not preferable from the viewpoint of construction to limit the vertical direction. Considering the internal circulation, it is preferable to perform the same connection in the upper half and the lower half, and therefore it is preferable to arrange even-numbered recesses at equal intervals. Moreover, when two recessed parts are provided, heat circulation does not function at all when the two recessed parts are arranged in a horizontal relationship with each other, which is not preferable. In order to provide the connecting portion most simply and effectively under these conditions, it is desirable to provide four recesses.

  In the optical reflecting portion 8, a metal film of aluminum, silver, or chromium is formed on each of the reflecting surfaces 24a, 24b, and 24c of the upright reflecting columns 23a, 23b, and 23c. Further, the step extension portion 20 and the like also form a reflection surface with the same metal film, and when the optical reflection portion 8 is viewed from above, the entire surface of the optical reflection portion 8 is viewed as the reflection surface.

  As a result, the use efficiency of light is enhanced, and the metallic appearance having a metallic luster is good and attractive.

  As shown in the top view of FIG. 11, the shape of the upright reflecting column 23 is such that the opposing surface 29 facing the LED is a flat surface, and both end portions are inclined at a predetermined angle with respect to the optical axis X of the LED. The inclined surface 30 is used. Thereby, the light emitted from the lens 9 and reaching the inclined surface 30 of the upright reflecting column 23 is reflected at a wide angle so that the light reaches a wide range to a cover (not shown) located above.

  As another shape of the upright reflecting column 23, as shown in the top view of FIG. 12, the facing surface 29 facing the LED may be a concave curved surface recessed toward the upright reflecting column 23, or the top view of FIG. As described above, the facing surface 29 facing the LED may be a convex curved surface bulging toward the LED.

It is a three-dimensional exploded view of the embodiment of the lighting device of the present invention. It is a top view of the lens concerning an embodiment. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view of the optical reflection part concerning embodiment. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is sectional drawing of embodiment of the illuminating device of this invention. It is the elements on larger scale of embodiment of the illuminating device of this invention. It is the elements on larger scale of embodiment of the illuminating device of this invention. It is a top view of the upright reflecting pillar concerning embodiment. It is a top view of the other upright reflecting pillar concerning embodiment. It is a top view of the other upright reflecting pillar concerning embodiment. It is sectional drawing of LED concerning the conventional illuminating device.

Explanation of symbols

1 Printed circuit board 2 LED
3 Lead wire 4 Gasket 5 Housing 6 Gasket mounting hole 7 Tapping screw 8 Optical reflecting portion 9 Lens 10 Cover 11 Rim 12 Convex portion 13 Concave curved surface 14 Rotating paraboloid surface 15 Step bottom surface 16 Locking claw 17 Locking protrusion 18 LED Light passage hole 19 Step bottom surface 20 Step extension portion 21 Locking protrusion insertion hole 22 Step top surface 23 Upright reflecting column 23a, 23b, 23c Upright reflecting column 24 Reflecting surface 24a, 24b, 24c Reflecting surface 25 Side surface 27 Space 29 Opposing surface 30 Inclined surface

Claims (5)

A substrate on which an LED serving as a light source is mounted;
A lens for introducing light emitted from the LED to control the optical path;
An illumination device including an optical reflecting portion having a plurality of upright reflecting columns that emit light emitted from the LEDs and guided through the lens and emitted from the lens in an irradiation direction,
The presence of a propagation restriction that partially restricts the propagation of light between the lens and the optical reflecting portion partially reduces the amount of light emitted from the lens and reaching the optical reflecting portion. When the reaching light amount reducing unit is formed in the optical reflecting unit, an optical state similar to the reaching light amount reducing unit of the optical reflecting unit is provided by providing a received light amount reducing unit at a regular position of the optical reflecting unit. An illuminating device provided at a regular position of an optical reflecting portion.   The illumination device according to claim 1, wherein the propagation restriction object is a locking protrusion that extends from the lens and locks the lens to the optical reflection unit.   3. The illumination device according to claim 1, wherein the received light amount reducing unit is an end surface provided on a surface of the optical reflecting portion facing the lens.   The upright reflecting column is curved in a direction opposite to the lens as the surface facing the lens goes upward, and at least one of aluminum, silver, and chrome is provided on a surface that receives light emitted from the lens. The illumination lamp according to any one of claims 1 to 3, wherein a metal film is formed to be a reflecting surface.   5. The lighting device internal space connecting portion comprising at least four non-joining portions at a joint portion between the optical reflecting portion and a housing that houses the optical reflecting portion. The illumination lamp of any one of Claims.

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