JP2006185817A - Indication lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and high-output indication lamp with an excellent visibility and little illuminance unevenness through an effective use of light from an LED of a small diameter. <P>SOLUTION: The indication lamp is provided with a reflecting mirror case 5 with an inner wall face as a reflecting mirror 2, with one side opened to be an irradiating part 3 and the other side closed to be a bottom part 4, and with a width diameter gradually increased from the bottom face toward the irradiating part; a narrow-angle LED lamp 6 with its light axis center coincided with the center axis of the reflecting mirror case and irradiating light at almost parallel narrow angles toward the bottom part; and a wide-angle LED lamp 7 with its light axis center coincided with the center axis of the reflecting mirror case and irradiating light at wide angles toward the irradiating part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display lamp using a high-power LED used for various signal lamps and the like, and in particular, a high-power small-sized display lamp with excellent visibility and less uneven illuminance by effectively using light of a small-diameter LED. It is about.

Recently, LED lamps using white light emitting LEDs have been used as an alternative to filament-type light bulbs that have been used in the past. For example, as an example, an LED lamp has been devised in which four LEDs are arranged on the bottom of a reflecting mirror and a lens is arranged on the front surface which is an irradiation unit. This LED lamp has features such as low power consumption and long life, and is provided with a cap having the same shape in consideration of compatibility with an incandescent bulb, and uses an AC 100 volt power source.
JP 2001-325809 A

  However, in the conventional LED lamp described above, the centers of the optical axes of a plurality of LEDs are arranged so as to deviate from the central axis of the reflecting mirror. No light or convergent light was obtained. Therefore, when only one LED is arranged so that the center of the optical axis coincides with the center axis of the reflecting mirror, there is a problem that the illuminance of one LED is insufficient. And when the irradiation part was enlarged, it was easy to raise | generate the illumination intensity nonuniformity that the outer peripheral part becomes dark although the center part in which LED is located seeing from the front is bright.

  Therefore, in order to solve the above-described problems, the present invention has an object to provide a high-power, small-sized display lamp that has excellent visibility and little illuminance unevenness by effectively using light from a small-diameter LED.

  In order to achieve the above object, the indicator lamp of the present invention comprises a first light emitting means for irradiating light in the direction of the irradiating portion of the reflector case and a second light emitting means for irradiating light in the direction of the bottom of the reflector case. The optical axis centers are made coincident and arranged on the central axis of the reflector case.

  Further, the reflecting mirror case is characterized by having a substantially bowl shape in which the width diameter gradually increases from the bottom toward the irradiation part.

  Further, a conical convex portion is provided at the bottom of the reflector case so as to project toward the second light emitting means, and the second light emitting means is provided at the bottom with a light irradiation angle narrower than that of the first light emitting means. The light is irradiated toward the light, and the light is reflected by the convex portion and scattered on the side peripheral wall of the reflector case.

  Further, the irradiating part of the reflecting mirror case is provided with a diffusing lens for diffusing the light from the second light emitting means reflected by the reflecting mirror case and the light from the first light emitting means. To do.

  According to the indicator lamp of the present invention, the first light emitting means for irradiating light in the direction of the irradiating portion of the reflector case and the second light emitting means for irradiating light in the direction of the bottom of the reflector case coincide with the center of the optical axis. By arranging the first light emitting means and the second light emitting means on the central axis of the reflecting mirror case so as to coincide with the center of the optical axis, the second light emitting means are arranged in a space efficient manner. Thus, diffused light and convergent light as designed according to the curvature of the reflecting mirror can be obtained, whereby the direct light from the surface by the first light emitting means and the reflected light from the back surface by the second light emitting means are combined. Bright light irradiation.

  In addition, the reflector case is formed in a substantially bowl shape in which the width diameter gradually increases from the bottom toward the irradiating unit, so that the light from the first light emitting unit faces the irradiating unit and the light from the second light emitting unit. Is reflected from the bottom and side walls of the reflector case and travels toward the irradiating part, and both light components combine to obtain bright diffused light.

  Further, a conical convex portion is provided at the bottom of the reflector case so as to project toward the second light emitting means, and the second light emitting means is provided at the bottom with a light irradiation angle narrower than that of the first light emitting means. The light is irradiated toward the light, and the light is reflected by the convex part and scattered on the side wall of the reflector case, so that the light from the second light emitting means is reflected and scattered by the circular convex part, The light is reflected from the reflecting mirror on the side wall and irradiated from the irradiation unit.

  Further, the irradiating part of the reflecting mirror case is provided with a diffusing lens for diffusing the light from the second light emitting means reflected by the reflecting mirror case and the light from the first light emitting means. The light of the first light emitting means and the second light emitting means can be diffused by the diffusing lens, and uneven illuminance can be reduced.

  FIG. 1 shows an indicator lamp 1 according to the present invention. The indicator lamp 1 has an inner wall surface as a reflecting mirror 2, one side is opened to form an irradiating section 3, and the other is a closed bottom section 4. The reflector case 5 whose width is gradually increased toward the center, and the center of the optical axis is positioned on the center axis of the reflector case 5, and light irradiation is performed at a narrow angle substantially parallel to the bottom 4 The narrow-angle LED lamp 6 is disposed back-to-back with the narrow-angle LED lamp 6 and is provided with its optical axis center aligned with the central axis of the reflector case 5 and irradiates light at a wide angle toward the irradiation unit 3. A wide-angle LED lamp 7, a first diffusing lens 8 that is disposed so as to cover the opening in the irradiation section 3 of the reflector case 5, and diffuses light from the narrow-angle LED lamp 6 and the wide-angle LED lamp 7; Similarly, the light transmitted through the first diffusion lens 8 is further diffused. And a second diffusion lens 9. Reference numeral 10 denotes a conical convex portion projecting from the bottom 4 of the reflector case 5, and the surface thereof is a reflector.

  FIG. 2 shows a structure in which the narrow-angle LED lamp 6 is halved. The narrow-angle LED lamp 6 is a light emitting device composed of LEDs or the like arranged on a flat base 11 on which a wiring pattern is formed. The member 12 is made of a transparent synthetic resin material such as acrylic having a maximum outer diameter of about 21 mm and a height of about 12.5 mm disposed above the light emitting member 12, and the width diameter is gradually enlarged toward the front. A total reflection lens 13 formed in a substantially inverted truncated cone shape, and an opaque cylindrical exterior that surrounds the side surface of the total reflection lens 13 and is disposed on the base 11 while holding the upper part of the total reflection lens 13 A cover 14 is provided.

  As shown in FIG. 3, the light emitting member 12 includes a small-diameter light emitting element 15 made of LED chips disposed on the substrate 2, and a ring-shaped acrylic resin that surrounds and surrounds the light emitting element 15. And a phosphor-containing synthetic resin 17 that covers the light emitting element 15 and is injected into the wall body 16. One or more thin bonding wires (not shown) for connecting a circuit pattern (not shown) on the substrate 2 and the electrodes of the light emitting element 15 are also surrounded by the wall 16.

  As shown in FIG. 4, the total reflection lens 13 of the narrow-angle LED lamp 6 has an inclined peripheral wall 18 formed into a unique curved surface slightly bulging outward from the lower end of the lens to the front surface of the lens, and an outer peripheral portion of the front surface of the lens. Is a flat body portion 19 and a central convex lens portion 20 having a convex front (R5) is formed in the central portion so as to protrude forward from a position slightly lower than the front surface of the lens. Then, the light from the light emitting member 12 disposed on the bottom is condensed and irradiated to the front of the lens as parallel light composed of a certain amount of light.

  Then, the parallel light from the narrow-angle LED lamp 6 travels toward the bottom portion 4 of the reflector case 5 and is scattered in the entire circumferential direction by being reflected by the conical convex portion 10 protruding from the bottom portion 4. The light is reflected by the reflecting mirror 2 on the side surface and is emitted from the irradiation unit 3 as scattered light from the outer periphery while avoiding the two LED lamps on the central axis of the reflecting mirror case 5.

  As shown in FIGS. 5 and 6, the wide-angle LED lamp 7 includes a light-emitting element 22 disposed on the base 11 and an opaque or semi-transparent hemispherical shape having a light diffusing action that covers the light-emitting element 22 as a center. The cover body 23 is comprised. Then, the light diffused at a wide angle from the light emitting element 22 is further diffused by the cover body 23 to obtain good uniform diffused light. The wide-angle LED lamp 7 and the narrow-angle LED lamp 6 are integrated back to back using a support 24 and are supplied with power from the outside via a support rod 25.

  FIG. 7 shows the first diffusing lens 8 in which a small-diameter hemispherical convex portion 26 is provided on the entire upper surface of a synthetic resin disk. And this many convex part 26 scatters the light from the inside as a whole without an illuminance nonuniformity.

  FIG. 8 shows the second diffusing lens 9 disposed on the upper surface of the first diffusing lens 8, in which a concave groove 27 is formed on a concentric circle inside a synthetic resin disc curved in a convex shape. It is. And the light which permeate | transmits the 1st diffuser lens 8 is further diffused, and visibility is increased.

  In the above-described embodiment, the configuration in which the first diffusion lens 8 and the second diffusion lens 9 are provided in the irradiation unit 3 of the reflector case 5 in a double manner has been described. In other words, it is possible to use a single diffusing lens. Further, the narrow-angle LED lamp 6 is not limited to parallel light, but may be any light that is narrowed to a certain extent with a light irradiation angle narrower than that of the wide-angle LED lamp.

It is sectional drawing which shows the indicator lamp of this invention. It is a fragmentary sectional perspective view which shows the narrow angle LED lamp in the display lamp of this invention. It is a fragmentary sectional perspective view which shows the light emission member of the narrow angle LED lamp in the display lamp of this invention. It is explanatory drawing which shows the optical path in the narrow angle LED lamp of the display lamp of this invention. It is a perspective view which shows the wide angle LED lamp in the indicator lamp of this invention. It is sectional drawing which shows the wide angle LED lamp in the indicator lamp of this invention. It is explanatory drawing which shows the 1st diffuser lens in the indicator lamp of this invention. It is explanatory drawing which shows the 2nd diffuser lens in the indicator lamp of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indicator lamp 2 Reflecting mirror 3 Irradiation part 4 Bottom part 5 Reflecting mirror case 6 Narrow angle LED lamp 7 Wide angle LED lamp 8 1st diffuser lens 9 2nd diffuser lens 10 Convex part 12 Light emitting member 13 Total reflection lens 15 Light emitting element 16 Wall body 17 Phosphor-containing synthetic resin 18 Peripheral wall 22 Light emitting element 23 Cover body 26 Convex part 27 Concave groove

Claims (4)

  The first light emitting means for irradiating light in the direction of the irradiating portion of the reflecting mirror case and the second light emitting means for irradiating light in the direction of the bottom of the reflecting mirror case are aligned with the center of the optical axis, and the central axis of the reflecting mirror case An indicator lamp arranged on the top.   The indicator lamp according to claim 1, wherein the reflector case has a substantially bowl shape in which the width diameter gradually increases from the bottom toward the irradiation part.   At the bottom of the reflector case, a conical convex portion is projected toward the second light emitting means, and the second light emitting means is directed toward the bottom at a light irradiation angle narrower than that of the first light emitting means. 2. The display lamp according to claim 1, wherein the light is irradiated and the light is reflected by the convex portion and scattered on the side peripheral wall of the reflector case.   The diffusing lens for diffusing the light from the second light emitting means and the light from the first light emitting means reflected by the reflecting mirror case is disposed in the irradiating portion of the reflecting mirror case. Item 1. An indicator lamp according to item 1.

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