JP2004221528A - Indication lamp having builtin light emitting diode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a decrease in quality due to color uneveness caused by a white light emitting diode and to securely insulate a conductive part and a case by making the case thin. <P>SOLUTION: An indication lamp contains a printed board 20 in the case 10 and a translucent plate 30 is arranged at a distance from the printed board 20. The printed board 20 has a plurality of light emitting diodes 40 fixed on its top surface side at given intervals and is provided with a conductive pattern 22P only on the top surface side and no conductive pattern on the back surface, and further provided with a diffused reflection layer 21 which reflects light so that the light is scattered at the top surface side. The translucent plate 30 has a transmission and diffused reflection layer 31 which transmits part of light and reflects the rest. The indication lamp reflects the light emitted by the light emitting diodes 40 in a scattered state by the transmission and diffused reflection layer 31 of the translucent plate 30 and the diffused reflection layer 21 of the printed board 20 and emits the light to the outside from the translucent plate 30. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to an indicator light such as an advertising light using a light emitting diode as a light source.

  Further, the present invention relates to the use of such an indicator lamp as a Schaukasten for reading an X-ray film, tracing a drawing, and the like.

  Light emitting diodes have extremely long lifetimes of tens of thousands of hours. Therefore, unlike a fluorescent lamp or a light bulb, there is no need to periodically replace the fluorescent lamp or the bulb, and maintenance can be simplified. The advertising light may be installed in a high place or a dangerous place where parts cannot be easily replaced and the cost for it is extremely high. Therefore, it is extremely important that the maintenance period can be extended. Taking advantage of this feature, advertising lights using light emitting diodes as light sources have been developed.

      By the way, since light-emitting diodes emitting red, blue, and green light have been developed, full-color display can be performed by combining light-emitting colors. For example, the advertising light described in the above-mentioned publication can emit white light by emitting red, blue, and green light emitting diodes together in a well-balanced manner. White is the most commonly used color and is often used for advertising lights. In addition, the above-described advertising light can be made white using a white light emitting diode. There are two methods for emitting white light with a light emitting diode. The first type is a type in which red, blue, and green light emitting diodes are combined and emitted together to produce white light. The second type is a type in which a phosphor is excited by light emission of a light emitting chip, and both light emission of the light emitting chip and light emission of the phosphor are mixed to make white. When a white advertising light is manufactured by combining red, blue, and green light emitting diodes, if any one of the light emitting diodes fails and does not light up, the emitted color shifts and cannot be made white. If the luminescent color is partially different, there is a drawback that this portion is very conspicuous and the failure location becomes clear. In particular, since the eyes are extremely sensitive to changes in white color, there is a disadvantage that even if the white color slightly shifts, a failure is noticeable.

This problem can be solved by using a light emitting diode that combines the light emission of the light emitting chip and the light emission of the phosphor and radiates the light to the outside to make it white. Since the light emitting diode excites the phosphor by the light emitted from the light emitting chip to emit light, if the light emitting chip fails to emit light, the phosphor does not emit light. Therefore, even if the light emitting chip fails, the luminescent color does not change.
Utility Model Registration No. 2511849

  However, a light emitting diode of a type in which light emitted from a light emitting chip is combined with light emitted from a phosphor to emit white light has a drawback in that light emission can be uneven in a manufacturing process. Since the emission color of the light emitting chip and the emission intensity of the phosphor are set to a specific balance and the emission color is white, if there is an error between the emission of the light emitting chip and the emission of the phosphor, the emission color will deviate from white. . In all mass-produced light emitting diodes, the light emitting intensity of the light emitting chip and the light emitting intensity of the phosphor cannot be balanced in an ideal state. The light emission color of the light emitting diode is generated with a very slight shift in the amount of the phosphor used. For example, when the filling amount of the phosphor is slightly increased, the absorption amount of light emitted by the light emitting chip increases, the light emission intensity of the light emitting chip decreases, and the light emission of the phosphor increases. When the luminous intensity of the light emitting chip decreases and the luminous intensity of the phosphor increases, the balance is lost and the luminous color shifts from white and emits a color close to the luminous color of the phosphor. To complicate matters, the human eye is extremely sensitive to color differences in the white region, and white has a slight difference in color. Therefore, if a plurality of white light emitting diodes are used and each of the light emitting diodes has color unevenness, the quality as an advertising light is degraded. This adverse effect is peculiar to an advertising light that uses a plurality of white light emitting diodes that emit white light by emitting light from a light emitting chip and a fluorescent substance. This is not a problem with an advertising light using only light-emitting diodes of monochromatic emission such as red, blue, and green. This is because it is difficult to recognize the difference in color of a single color other than white, and the emission color is not specified based on the balance of the emission intensity between the light emitting chip and the phosphor.

    Light-emitting diodes have the advantage of being extremely long-lived, which is extremely difficult to achieve with fluorescent lamps and light bulbs. It is possible to realize an advertising light having exactly ideal characteristics. A first object of the present invention is to realize this, and to provide an indicator light capable of eliminating quality deterioration due to color unevenness caused by a white light emitting diode while utilizing excellent characteristics of the light emitting diode. is there.

      In addition, it is important to make the advertising light thin so that it does not break down. The advertising lamp described in the above-mentioned publication fixes a light emitting diode on a circuit wiring board provided with conductive layers on both sides, or laminates a diode mounting wiring board on this circuit wiring board. Therefore, if this is stored in a case and used as an advertising light, the whole will become thicker. Further, since the conductive layers are provided on both sides of the circuit wiring board, it is necessary to dispose the conductive layers away from the case in order to insulate the conductive layers from the case, which also causes the overall thickness to be increased. A second object of the present invention is to eliminate this drawback, and to provide an indicator light that can make the case thin and reliably insulate the conductive portion from the case.

  The indicator light incorporating the light emitting diode of the present invention includes a case 10, a printed circuit board 20 housed in the case 10, and a transparent board disposed opposite to the printed circuit board 20 so as to face the surface of the printed circuit board 20. And an optical plate 30. The printed circuit board 20 has a plurality of chip-type light emitting diodes 40 fixed on the front surface thereof at predetermined intervals. Further, the printed circuit board 20 has the conductive pattern 22P provided only on one surface on the front surface side, and has no conductive pattern provided on the back surface. Furthermore, the printed circuit board 20 is provided with a diffuse reflection layer 21 for reflecting light so as to scatter the light on the surface side. The light-transmitting plate 30 has a transmissive irregular reflection layer 31 that transmits a part of the light of the light-emitting diode 40 and reflects so that a part of the light is scattered. In this indicator light, light emitted from the light emitting diode 40 is scattered by the transmission diffused reflection layer 31 of the light transmission plate 30 and the diffuse reflection layer 21 of the printed circuit board 20 and emitted from the light transmission plate 30 to the outside.

      The light emitting diode 40 includes a light emitting chip 41 that emits visible light and a phosphor 42 that emits visible light of a color different from the light emitted from the light emitting chip 41 when excited by the light emitted from the light emitting chip 41. it can. The light emitting diode 40 has a phosphor 42 disposed in an optical path for emitting light of the light emitting chip 41 to the outside, and emits both light emission of the light emitting chip 41 and light of the phosphor 42 to the outside. The light emission of 41 and the light emission of the phosphor 42 emit white light.

    The irregular reflection layer 21 can be provided by applying a white pigment to the surface of the printed circuit board 20. The translucent plate 30 may be provided with a transmissive irregular reflection layer 31 by filling a white pigment therein.

    The conductive pattern 22P provided on the surface of the printed circuit board 20 may include positive and negative power lines 22 parallel to each other and separated by a predetermined distance. The printed circuit board 20 has LED circuits 23 connecting the light emitting diodes 40 arranged in parallel in a plurality of rows between the positive and negative power supply lines 22, and the ends of the LED circuits 23 are connected to the positive and negative power supply lines. 22 can be connected. Each LED circuit 23 can be provided with positive and negative output terminals 24 connected to the power supply line 22.

    Further, in the indicator lamp of the present invention, a lead wire 71 connected to the output terminal 24 of the printed circuit board 20 can be provided between the back surface of the printed circuit board 20 and the case 10. Further, in the indicator light of the present invention, the spacer 60 is fixed to the case 10, the spacer 60 is inserted into the through hole 25 provided in the printed circuit board 20, and the printed circuit board 20 is fixed to the case 10 by the spacer 60. Can be. Furthermore, the indicator lamp of the present invention can accommodate a plurality of rectangular printed boards 20 in the case 10 and connect the output terminals 24 of each printed board 20 with the lead wire 71.

  Further, the indicator lamp of the present invention can be used as a Schaukasten.

  The present invention has the feature that the case can be made thinner and the conductive portion and the case can be reliably insulated. This is because the indicator lamp of the present invention has a conductive pattern provided only on one surface on the front side of the printed circuit board provided therein, and no conductive pattern is provided on the back surface. Since the printed circuit board has no conductive pattern on the back surface, the printed circuit board can be reliably insulated even if this surface is extremely close to the bottom of the case. Therefore, the indicator lamp having this structure can be disposed while reliably insulating the printed circuit board while making the case the thinnest, and it is possible to minimize the trouble due to the insulation failure.

    Further, the present invention has a feature that it is possible to eliminate quality deterioration due to color unevenness caused by a white light emitting diode while utilizing the excellent characteristics of the light emitting diode. This is because the indicator lamp of the present invention reflects the light emitted from the light emitting diode in a scattering state by the diffusely reflecting layer of the light transmitting plate and the diffusely reflecting layer of the printed circuit board and emits the light to the outside. In the indicator lamp that emits light to the outside in this state, the light of each light emitting diode is mixed with the transmitted diffusely reflective layer and the diffusely reflective layer and emitted to the outside. Therefore, even if the adjacent light emitting diodes have uneven color, the uneven light can be eliminated because the mixed light is emitted to the outside. Also, even if one of the light emitting diodes breaks down and does not turn on, the light emitted by the adjacent light emitting diode emits light even from the vicinity of the light emitting diode that has turned off. Can be made inconspicuous when viewed from the outside.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below exemplify indicator lights for embodying the technical idea of the present invention, and the present invention does not specify the indicator lights as follows.

    Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. Are added to the members indicated by "." However, the members described in the claims are not limited to the members of the embodiments.

    INDUSTRIAL APPLICABILITY The indicator light of the present invention is used for various purposes such as an advertising light for displaying various advertisements, a warning light for notifying a dangerous place and cautions, a sign light such as a traffic sign, and a guide light used for guidance and guidance. it can.

  In such a display lamp, when the light emitted from the light source from the display surface is white, it can be used as a Schaukasten for reading an X-ray film, tracing a drawing, and the like.

  The indicator lamp shown in FIG. 1 and FIG. 2 is arranged in parallel with the case 10, the printed circuit board 20 accommodated in the case 10, and the surface of the printed circuit board 20, and closes the opening of the case 10. And a light transmitting plate 30. In the illustrated indicator lamp, the case 10 has a square shape. However, the indicator lamp does not necessarily have to have a square shape of the case, and is manufactured in an optimal shape as various indicator lamps.

    The case 10 is a metal case. The case 10 is manufactured by processing a metal plate. However, it can be made of a material other than metal. In the case 10 shown in the figure, a peripheral wall 12 is provided around a bottom plate 11 and a printed circuit board 20 is housed inside. The light transmitting plate 30 is fixed to the upper end of the peripheral wall 12, and the light transmitting plate 30 closes the opening of the case 10. In order to fix the translucent plate 30, the case 10 shown in the figure is provided with a bent surface 13 by bending the upper edge of the peripheral wall 12 inward. The bent surface 13 is parallel to the bottom plate 11, on which the light transmitting plate 30 is fixed. A through hole 14 is provided in the light transmitting plate 30 and the bent surface 13. A set screw 15 is inserted through the through hole 14, and the light transmitting plate 30 is fixed to the bent surface 13 with the set screw 15. The set screw 15 is screwed into the through hole 14 of the bent surface 13 as a female screw hole, or a nut (not shown) is provided on the inner surface of the bent surface, and the set screw is screwed into the nut to fold the light transmitting plate 30. Fix to a curved surface. With this structure, the light-transmitting plate 30 can be removed from the case 10 by removing the setscrew 15, so that maintenance can be simplified. In the case 10, the inner surface is colored white so that the inner surface reflects white light efficiently.

  The indicator lamp is fixed to a wall surface of a building or the like with a fixing base 74 made of a bent metal using a fixing bolt 73 with the surface of the light-transmitting plate 30 in a vertical direction.

    In addition, when the present indicator light is used as a Schaukasten for reading with an X-ray film attached, the indicator light is installed on a wall 91 in a room (see FIG. 9). Further, in the case of using for tracing a drawing, the fixed base 74 is omitted and the tracing work is performed on a desk.

    The light-transmitting plate 30 is disposed facing the surface of the printed circuit board 20 and away from the printed circuit board 20. The translucent plate 30 has a transmissive irregular reflection layer 31 that transmits a part of the light of the light emitting diode 40 but reflects part of the light so as to scatter it. The translucent plate 30 is formed by filling a powdery white pigment into a transparent glass or plastic and forming a transmissive diffuse reflection layer 31 with the white pigment. The light-transmitting plate may be provided with a transmissive irregular reflection layer with the inner surface or the surface being a fine uneven surface. This is because the minute uneven surface is reflected so as to scatter incident light. In addition, the light transmitting plate 30 may be provided with fine irregularities on one or both sides, and may be provided with a white pigment therein to provide a transmission diffused reflection layer. The light transmitting plate 30 transmits a part of the light of the white light emitting diode 40 and reflects it so as to scatter part of the light. Further, on the light transmitting plate 30, information to be displayed can be provided by drawing pictures, characters, and the like in a light transmitting or light shielding pattern. Alternatively, information to be displayed can be provided by installing a film on which a pattern, a character, or the like is drawn on the outer surface of the light transmitting plate 30 using a light transmitting or light blocking pattern.

  Further, a part of the light of the light-emitting diode 40 is transmitted without drawing a pattern on the light-transmitting plate 30, but a part of the light is reflected so as to be scattered, and an X-ray film is formed on the outer surface of the light-transmitting plate 30. Can be attached for reading. Similarly, the base paper of the drawing can be traced by superposing the base paper of the drawing and the trace paper on the outer surface of the light transmitting plate 30.

  Further, the printed circuit board 20 has a plurality of chip-type light emitting diodes 40 fixed on the surface thereof at predetermined intervals, and a diffuse reflection layer 21 for reflecting light so as to scatter the light on the surface side. The printed board 20 is provided with the irregular reflection layer 21 by applying a white pigment on the surface. The white pigment is adhered to the surface of the printed circuit board 20 via a binder in a powder form. However, the printed board may be provided with a diffuse reflection layer by bonding a white sheet to the surface. The color sheet has fine irregularities on its surface and scatters light. This white sheet is, for example, a nonwoven fabric or white paper. The irregular reflection layer may be provided on the printed circuit board by bonding a metal foil or a metal plate having fine irregularities on the surface. Since the metal irregular reflection layer is conductive, it is provided on the surface of the printed circuit board so as to be insulated from the conductive pattern.

    The irregular reflection layer 21 of the printed circuit board 20 reflects light irregularly. The diffuse reflection layer 21 of the printed circuit board 20 that diffusely reflects light reflects the light reflected by the transmission diffuse reflection layer 31 of the light transmission plate 30 so as to be scattered in various directions, and transmits light transmitted through the light transmission plate 30. Disperse evenly. That is, the light emitted from the white light-emitting diode 40 is repeatedly reflected while being scattered by the transmission diffused reflection layer 31 of the light transmission plate 30 and the diffuse reflection layer 21 of the printed circuit board 20, and the uniform light is transmitted from the light transmission plate 30. Is released to the outside. The light-transmitting plate 30 emits light that is repeatedly reflected in a scattering state by the transmission diffused reflection layer 31 and the diffuse reflection layer 21 to the outside. In this state, the light is emitted to the outside, so that the light of each light emitting diode 40 is mixed by the transmission diffused reflection layer 31 and the diffuse reflection layer 21 and emitted to the outside. Therefore, even if the adjacent white light emitting diodes 40 have uneven color, the uneven light can be mixed and emitted to the outside to eliminate the uneven color. Further, even if one of the white light emitting diodes 40 fails and stops lighting, the turned off white light emitting diode 40 can be made inconspicuous from the outside. This is because the light emission of the adjacent white light emitting diode 40 that is turned on also emits light to the outside from the vicinity of the white light emitting diode 40 that is turned off.

  The diffusely reflecting layer 31 of the light transmitting plate 30 transmits part of the light, but the diffusely reflecting layer 21 of the printed circuit board 20 does not need to transmit the light of the light emitting diode 40. Light is efficiently reflected without transmitting.

    The printed circuit board 20 has the conductive pattern 22P provided only on one surface on the front side, and does not have the conductive pattern 22P provided on the back surface. The conductive pattern 22 </ b> P provided on the printed circuit board 20 is connected to the white light emitting diode 40, and a current flows through the white light emitting diode 40 to light up. FIG. 5 shows the conductive pattern 22P provided on the surface of the printed circuit board 20. The printed circuit board 20 of this figure has positive and negative power supply lines 22 which are separated from each other by a predetermined distance and are parallel to each other. A plurality of light emitting diodes 40 and a current limiting element 50 are linearly arranged between the positive and negative power supply lines 22. The LED circuits 23 connected in series are arranged in parallel in a plurality of rows, and the ends of the LED circuits 23 are connected to the positive and negative power supply lines 22. In the printed circuit board 20 shown in the figure, five white light emitting diodes 40 and two resistors serving as current limiting elements 50 are connected in series to one LED circuit 23. FIG. 6 shows a part of the printed circuit board 20 of FIG. The printed circuit board 20 is provided with positive and negative power supply lines 22 so as to extend in the horizontal direction along upper and lower edges on the paper surface of FIG. 6, and an LED circuit 23 is connected to the upper and lower power supply lines 22 so as to connect the upper and lower ends. A plurality of rows are provided so as to extend vertically.

    In the present embodiment, in the printed circuit board 20 shown in FIG. 5, the smallest unit that can be used as a light-emitting body indicated by a chain line is the unit 80. In the continuous unit 80 of FIG. 6 cut from the printed circuit board 20, each unit 80 has an LED circuit 23 extending in the vertical direction on the paper surface of FIG. An output terminal 24AU connected to the central power supply line 22A is provided. The output terminal 24AU has a circular opening of the printed circuit board 20 provided inside the conductive pattern, and the conductive pattern is exposed at the periphery of the opening without the irregular reflection layer 21 being provided.

  An extension line 22U, which is a conductive pattern extending from the output terminal 24AU toward the end-side power supply line 22B (downward in FIG. 6), has an output terminal 24AD at a lower end thereof. The output terminal 24AD has the same structure as the output terminal 24AU described above.

  On the other hand, an output terminal 24BD connected to the end side power supply line 22B is provided near the end side power supply line 22B. The output terminal 24BD has the same structure as the output terminal 24AU described above. The end-side power supply line 22B has an extension line 22D which is a conductive pattern extending toward the center-side power supply line 22A (upward in FIG. 6), and has an output terminal 24BU at the upper end thereof. . This output terminal 24BU has the same structure as the above-described output terminal 24AU.

  Therefore, in each unit 80, the output terminals 24AU and 24BU and the output terminals 24AD and 24BD of the central power supply line 22A and the end power supply line 22B are arranged adjacent to each other on both upper and lower sides. Therefore, by supplying power between the adjacent output terminals 24AU and 24BU or between the output terminals 24AD and 24BD, the white light emitting diode 40 of the printed circuit board 20 can be energized.

  In FIG. 5, the end-side power supply line 22B located at the upper end of the plurality of units 80 located on the upper side and the end-side power supply line 22B located at the lower end of the plurality of units 80 located on the lower side are formed. Are connected on both sides of the printed circuit board 20 by connection lines 22S which are conductive patterns. Further, the central power supply line 22A located at the lower end of the plurality of units 80 located on the upper side and the central power supply line 22A located at the upper end of the plurality of units 80 located on the lower side are located at the center of the printed circuit board 20. Are connected by a connection line 22M which is a conductive pattern.

  In the printed circuit board 20 including such a unit 80, it is possible to supply power to the entire light emitting diodes 40 on the printed circuit board 20 only by supplying power to the adjacent output terminal 24 of any one of the units 80. it can.

    As shown in FIG. 5, the printed circuit board 20 is cut between adjacent LED circuits 23 as indicated by a dashed line, and furthermore, one cut printed circuit board 20 includes a pair of power supply lines 22. As described above, it can be cut at the position indicated by the chain line. For example, as shown in FIG. 6, it can be cut and used in a state of four units 80. In addition, it can be used in a state where one or more units 80 are connected. Even when such units 80 are connected and used, power can be supplied to the entire light emitting diode 40 only by supplying power to one adjacent output terminal 24.

  The shape obtained by combining the units 80 can be cut from the printed circuit board 20 in accordance with the shape of various cases 10 required as an indicator light such as an advertising light. Further, a plurality of printed circuit boards 20 can be used.

  In the printed circuit board 20, the adjacent output terminals 24 are connected via the lead wires 71 or connected to the lead wires 71 via the connectors 72, so that the white light emitting diodes 40 of all the printed circuit boards 20 can be energized. Here, the metal terminal (not shown) of the lead wire 71 or the connector 72 is soldered to the conductive pattern exposed on the periphery of the opening of the output terminal 24.

  FIG. 9 is a perspective view showing a case where the indicator lamp is used as a Schaukasten for reading the X-ray film 90. It has the same structure as the indicator light shown in FIGS. 1 to 8, and a detailed description is omitted. A translucent plate 30 having no pattern is supported on the case 10, and an X-ray film 90 is formed on the outer surface of the translucent plate 30 on the upper side of the case 10 by using a well-known holding unit (not shown). Is held. The printed circuit board 20 (not shown) is disposed on the back side of the light transmitting plate 30. Further, in such a Schaukasten, the printed circuit board disposed on the back side of the light-transmitting plate is made into a desired size or divided into a desired size, and a pair of power supply lines or adjacent output terminals are provided in the printed circuit board. 24 (see FIGS. 5 and 6), power can be independently supplied to a power supply line or an adjacent output terminal of the printed circuit board. Then, a plurality of light-emitting regions (in FIG. 9, divided into three and divided by dotted lines) 92A, 92B, and 92C can be formed by the light emission of the white light-emitting diodes 40 from these printed boards. In such a Schaukasten, each of the light-emitting regions 92A, 92B, and 92C can emit light independently, so that only the necessary regions can emit light and the X-ray film 90 can be read. As described above, in the present embodiment, an independent light emitting region can be easily formed by using the printed circuit board 20 having the basic pattern as shown in FIG.

  Further, in the case where the light emitting diode 40 is used as a Schaucusten as in the present embodiment, the interval between the plurality of light emitting diodes 40 arranged linearly between the positive and negative power supply lines 22 shown in FIG. It is desirable to increase the illuminance by making it smaller (for example, a pitch of 20 to 25 mm) as compared with (for example, a pitch of 30 to 35 mm).

  The printed circuit board 20 has a chip-type white light emitting diode 40 fixed on the surface. As shown in the schematic cross-sectional view of FIG. 3, the white light emitting diode 40 includes a light emitting chip 41 that emits visible light, and a visible light of a color different from the light emission of the light emitting chip 41 when excited by the light emission of the light emitting chip 41. And a phosphor 42 that emits light. The light emitting chip 41 emits, for example, blue light. The phosphor 42 absorbs the light emitted from the light emitting chip 41 and emits a color that becomes white when mixed with blue. The phosphor 42 is filled in a transparent resin 43 applied on the surface of the light emitting chip 41. The transparent resin 43 is an epoxy resin or acrylic transparent resin, and the phosphor 42 is mixed in an uncured state, and the uncured paste resin mixed with the phosphor 42 is coated on the surface of the light emitting chip 41. Apply and cure. In the white light emitting diode 40 of FIG. 3, a light emitting chip 41 is fixed on a support base 44. The light emitting chip 41 fixed to the support base 44 is covered with a phosphor mixed resin so as to cover the light emitting chip 41. In the white light emitting diode 40 shown in this figure, a phosphor 42 is disposed in an optical path for emitting light of the light emitting chip 41 to the outside, and both light emission of the light emitting chip 41 and light of the phosphor 42 are emitted to the outside. Accordingly, white light is emitted by the light emission of the light emitting chip 41 and the light emission of the phosphor 42. The pair of electrodes provided on the light emitting chip 41 are connected to the extraction electrode 45 by a metal wire 46. As shown in FIG. 4, the white light-emitting diode 40 can also cover the surface of the transparent resin 43 filling the phosphor 42 with a cover resin 47 that transmits light. The white light emitting diode 40 is fixed to the printed circuit board 20 by connecting the extraction electrode 45 to the conductive pattern 22P of the printed circuit board 20 by soldering or the like.

    In the indicator light of FIG. 2, the printed circuit board 20 is fixed to the case 10 via the spacer 60. The spacer 60 is formed by integrally molding plastic into a rod shape as shown in FIG. 7. A fixing portion 61 for fixing the case 10 is provided at a lower end portion, and a connecting portion 62 for connecting the printed circuit board 20 is provided at an upper end portion. ing. The fixed portion 61 at the lower end has a flange 61A provided at the lower end and a pair of elastic arms 61B inserted into the through hole 16 of the case 10. The elastic arm 61B is elastically expanded and abuts on the upper surface of the case 10. The fixing portion 61 is fixed to the case 10 so that the elastic arm 61B and the flange 61A sandwich the bottom plate 11 of the case 10 so as not to come off. The elastic arm portion 61B is elastically deformed and inserted into the through hole 16 of the case 10, and then opens to hold the case 10. Further, the connecting portion 62 provided above the spacer 60 also has a pair of expanding arms 62A. The expanding arm 62A also elastically expands and comes into contact with the upper surface of the printed circuit board 20. The connecting portion 62 holds the printed circuit board 20 at a fixed position by sandwiching the printed circuit board 20 between the expanding arm 62A and the upper surface of the elastic arm 61B. The expanding arm 62A is elastically deformed and inserted into the through hole 25 of the printed circuit board 20, and then opens to hold the case 10. The spacer 60 is inserted into the through hole 16 of the case 10 and is easily fixed to the case 10. Further, the spacer 60 is inserted into the through hole 25 of the printed circuit board 20 and the printed circuit board 20 can be easily fixed. The through-hole 26 provided in the printed board 20 is used for putting a finger when attaching the printed board 20. Such a through hole 26 may be omitted. Further, since the spacer 60 is made of a plastic material such as white and has a substantially semi-spherical tip, the light of the light emitting diode 40 can be sufficiently reflected.

  The indicator lamp of FIG. 1 contains a plurality of rectangular printed circuit boards 20 in a case 10. Each printed circuit board 20 is connected to each other by connecting the output terminals 24 with the lead wires 71. Each of the printed circuit boards 20 cut into a square is provided with three or more, preferably four or more through holes 25 for fixing to the case 10 via the spacer 60. A spacer 60 is inserted into the through hole 25 of the printed circuit board 20, and is fixed at a fixed position while being separated from the bottom plate 11 of the case 10 by a predetermined distance via the spacer 60. The printed circuit board 20 fixed to the case 10 via the spacer 60 is connected to the output terminal 24 of the printed circuit board 20 by connecting the lead wire 71 to the lower surface and between the back surface of the printed circuit board 20 and the case 10. Lead wire 71 is provided.

      The indicator light, in which the lead wire 71 having an insulating coating is connected to the lower surface of the printed circuit board 20 via a connector 72, makes the printed circuit board 20 and the bottom plate 11 of the case 10 extremely close together, and There is a feature that the part can be reliably insulated from the case 10. This is because the printed circuit board 20 has no conductive pattern on the lower surface, and further, the connector 72 is fixed to the lower surface of the printed circuit board 20 so that the conductive portion is not exposed on the lower surface of the printed circuit board 20. Therefore, the indicator light of this structure can reliably insulate the printed circuit board 20 while making the case 10 the thinnest.

  Further, the indicator light can be fixed to a fixed base 74 such as a wall surface by bringing the printed circuit board 20 close to the case 10 as a mounting structure shown in FIG. In the indicator light, a through hole 26 is provided in the printed circuit board 20 so as to penetrate a head of a stop bolt 73 for fixing the indicator light. The fixing bolt 73 has its head penetrated through the printed circuit board 20 to fix the bottom plate 11 of the case 10 to the fixing base 74. Since the head of the stop bolt 73 is made of metal such as stainless steel, it sufficiently reflects light.

FIG. 1 is an exploded perspective view of an indicator light including a light emitting diode according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an indicator light incorporating a light emitting diode according to an embodiment of the present invention. Enlarged sectional view showing an example of a light emitting diode fixed to a printed circuit board Enlarged sectional view showing another example of a light emitting diode fixed to a printed circuit board Plan view showing an example of a printed circuit board FIG. 5 is a plan view showing a part of the printed circuit board of FIG. Enlarged sectional view showing the connection structure between the case and the printed circuit board Sectional view of an indicator light incorporating a light emitting diode according to another embodiment of the present invention. A perspective view when the present invention is used as a Schaukasten

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 ... Case 11 ... Bottom plate 12 ... Peripheral wall 13 ... Bent surface 14 ... Through-hole 15 ... Set screw 16 ... Through-hole 20 ... Printed circuit board 21 ... Diffuse reflection layer 22 ... Power supply line 22A ... Center side power supply line
22B ... end side power supply line
22U ... Extended line
22D ... Extended line
22S ... connecting line
22M ... connecting line
22P: conductive pattern 23: LED circuit 24: output terminal 24AU: output terminal
24AD ... output terminal
24BU ... output terminal
24BD ... output terminal 25 ... through-hole 26 ... through-hole 30 ... translucent plate 31 ... transmissive diffuse reflection layer 40 ... light-emitting diode 41 ... light-emitting chip 42 ... phosphor 43 ... transparent resin 44 ... support base 45 ... extraction electrode 46 ... metal wire 47 cover resin 50 current limiting element 60 spacer 61 fixed part 61A flange
61B ... elastic arm 62 ... connecting part 62A ... expanding arm 71 ... lead wire 72 ... connector 73 ... locking bolt 74 ... fixed base 80 ... unit

Claims (10)

A case (10), which is housed in the case (10), has a plurality of chip-type light emitting diodes (40) fixed on the front surface at predetermined intervals, and has a conductive pattern (only) on one surface on the front surface. 22P), a printed circuit board (20) provided with no conductive pattern on the back side, and a diffusely reflecting layer (21) for reflecting light so as to scatter light on the front side, and the printed board (20 ) Is disposed away from the printed circuit board (20) in opposition to the surface of the light-emitting diode (40), and transmits part of the light of the light-emitting diode (40) and reflects part of the light so as to scatter it. 31) having a light-transmitting plate (30),
The light radiated from the light emitting diode (40) is reflected in a scattering state by the diffusely reflecting layer (31) of the light transmitting plate (30) and the diffusely reflecting layer (21) of the printed circuit board (20) so as to be scattered. ) An indicator lamp with a built-in light emitting diode that emits light to the outside. A light emitting diode (40) emits visible light, a light emitting chip (41), and a fluorescent light that emits visible light of a color different from that of the light emitting chip (41) when excited by the light emitted from the light emitting chip (41). Body (42), and the phosphor (42) is disposed in an optical path for emitting light of the light emitting chip (41) to the outside, and the light emission of the light emitting chip (41) and the phosphor (42) are provided. 2. A display incorporating a light-emitting diode according to claim 1, wherein the light-emitting diode emits both light to the outside and emits white light by light emission of the light-emitting chip (41) and light emission of the phosphor (42). light. 2. The indicator light according to claim 1, wherein the printed circuit board (20) is provided with a diffusely reflecting layer (21) by applying a white pigment on the surface. 2. The indicator lamp incorporating a light emitting diode according to claim 1, wherein the light transmitting plate (30) is provided with a transmissive irregular reflection layer (31) by filling a white pigment therein. A conductive pattern (22P) provided on the surface of the printed circuit board (20) has positive and negative power lines (22) parallel to each other and separated from each other for a predetermined time, and a light emitting diode is provided between the positive and negative power lines (22). The LED circuit (23) connecting the (40) is arranged in parallel in a plurality of rows, and the end of the LED circuit (23) is connected to the positive and negative power supply lines (22). Indicator light incorporating a light-emitting diode described in 1. The indicator light according to claim 5, wherein each LED circuit (23) is provided with a positive / negative output terminal (24) connected to a power supply line (22). The lead wire (71) connected to the output terminal (24) of the printed circuit board (20) is provided between the back surface of the printed circuit board (20) and the case (10). Indicator light with built-in light emitting diode. Fix the spacer (60) to the case (10), insert the spacer (60) into the through hole (25) provided in the printed circuit board (20), and use the spacer (60) to secure the printed circuit board (20) to the case. An indicator light incorporating the light-emitting diode according to claim 1 fixed to (10). A plurality of rectangular printed circuit boards (20) are accommodated in a case (10), and output terminals (24) of the respective printed circuit boards (20) are connected by lead wires (71). Indicator light incorporating a light-emitting diode described in 1. 10. An indicator light incorporating a light-emitting diode according to claim 1, wherein the indicator light is used as a Schaukasten.

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