JP3931414B2 - Recessed beacon lamp and recessed beacon light device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present inventionSuitable for airport useThe present invention relates to an embedded marker lamp and an embedded marker lamp device.
[0002]
[Prior art]
  The inventors of the present invention invented a downsized marker lamp, an embedded marker lamp and an embedded marker lamp device that have been miniaturized using this lamp, and applied for a patent as Japanese Patent Application No. 8-262709. is doing.
[0003]
    FIG. 15 is a cross-sectional view of the optical axis portion of the embedded marker lamp apparatus of the prior invention.
[0004]
    FIG. 16 is a sectional view of a lamp for a marker lamp.
[0005]
  In the figure, 101 is a lamp, 102 is a prism, 103 is a lamp for a marker lamp, and 104 is a base.
[0006]
  The lamp body 101 includes a light guide groove 101a disposed on the upper surface and an internal space 101b communicating with the light guide groove 101a. Furthermore, the lamp body 101 includes an upper lamp body 101c and a lower lamp body 101d covered with the upper lamp body 101c.
[0007]
  The prism 102 is disposed in a liquid-tight manner between the light guide groove 101a and the internal space 101b of the lamp body 101, and restricts the optical path to be at a low angle with respect to the road surface.
[0008]
  As shown in FIG. 16, the lamp 103 for a marker lamp has a light bulb 103b in a reflector 103a in advance and a reflecting surface 103a1 whose center of the filament 103b1 is a single paraboloid.ofIt is fixed and integrated by a base cement 103c so as to be positioned substantially at the focal point. The reflector 103a is integrally formed with a cylindrical portion 103a2 at the top, and the sealing portion 103b1 of the light bulb 103b is inserted into the cylindrical portion 103a2, and the cap cement 103c is poured into the gap therebetween. It is stuck.
[0009]
  Further, the marker lamp 103 is formed in a shape in which a cut portion 103a3 is formed in an upper portion on the opening end side of the reflector 103a. Then, as shown in FIG. 12, the reflector 103a is arranged in the lamp body 101 of the embedded marker lamp so as not to protrude upward from the prism 102, so that the reflected light of the reflector 103a is increased as much as possible. It is comprised so that it may inject into.
[0010]
  In FIG. 15, G indicates a road surface on which a marker lamp is embedded.
[0011]
  Thus, the embedded marker lamp is used by being embedded in the road surface G with the upper surface of the lamp body 101 exposed. Further, the marker lamp 103 is formed by holding the reflector 103a and the light bulb 103b in a predetermined positional relationship in advance, so that the optical adjustment of the embedded marker lamp is easy, and the reflector 103a Since the cut part 103a3 is formed in the upper part, it succeeded in making the height dimension in an embedded type | mold marker lamp remarkably small.
[0012]
  For this reason, the embedding depth of the embedding type marker lamp can be considerably reduced.
[0013]
[Problems to be solved by the invention]
  However, there is a demand for further thinning of the embedded marker lamp, and the appearance of a marker lamp, an implantable marker lamp, and an implantable marker lamp device that meet this demand is desired.
[0014]
  Furthermore, in an airport-mounted recessed marker lamp, a light distribution characteristic that maintains a predetermined luminous intensity within a small elevation angle range and a large horizontal angle range from side to side must be satisfied. It is never easy to satisfy with the use of a lamp for a sign lamp with minimum power consumption.
[0015]
  The present inventionLight bulb and reflector integratedTo improve the reflector of a lamp for a marker lamp and to further reduce the thickness of the lamp body, and to provide an embedded marker lamp and an implantable marker lamp device that can easily obtain a required light distribution characteristic. Objective.
[0016]
[Means for achieving the object]
    BookInventionEmbedded typeBeacon lightsA light guide groove disposed on the upper surface and obliquely upward, and having a light guide groove and an inner space communicating with the light guide groove, the tip of which is substantially at the same position as the road surface; A light-path-restricting prism disposed in a liquid-tight manner in between and refracting incident light downward; and an integrated light bulb and a reflector, and the light bulb is provided inside the bulb and the bulb. The reflector has a filament sealed inside, and the reflector has a light bulb disposed inside, and the upper half reflection surface configured so that the reflected light of the light emitted from the light bulb does not cross the central axis, and the light emitted from the light bulb. When the reflector is viewed from the side, the opening end of the upper half reflection surface is Retreat to the top side from the open end of the lower half reflection surface so that it faces the prism, and the upper half reflection surface is on the upper side so that it is mostly located in the interior space of the lamp body below the road surface. With a lamp for the sign lamp arranged;It is characterized by comprising.
[0017]
  The definitions and technical meanings of terms in the present invention and each of the following inventions are as follows.
[0018]
  Of the present inventionEmbedded typeBeacon lightsairportHowever, the application is not limited to this, such as road use. For airports, it can be applied to desired applications such as runway center line lights, taxiway lights, stop line lights, etc., and for roads, for intersection point signs.
[0019]
  This kind of step-type beacon lamp needs to emit light at a small elevation angle with respect to the road surface, and it is difficult to set the optical axis of the lamp at a small angle with respect to the road surface inside the lamp body. Therefore, the optical path radiated from the lamp is refracted in the road surface direction with a prism interposed therebetween. The optical path regulation means that the optical path is regulated in a predetermined direction as described above, for example.
[0020]
  The lamp for the marker lamp includes an integrated light bulb and a reflector.The light bulb is preferably a halogen light bulb from the viewpoint of small high light output, but since a light bulb with krypton or xenon gas sealed can also be obtained with a relatively small high light output, and even when a small high light output is not required, Allow use of other bulbs. Some halogen bulbs have an infrared reflecting film formed on the surface of the bulb, but this configuration is suitable for the present invention because of its high luminous efficiency.
[0021]
  The reflector is preferably one in which a reflective film having a high reflectance is deposited on the inner surface of the substrate, but if the substrate itself is made of a highly reflective material such as high-purity aluminum, it is not necessary to deposit a reflective film separately. Absent. Further, glass or metal is suitable as the substrate.
[0022]
  The “center axis” refers to the geometric center line of the reflector that is determined independently of the optical action of the reflector.
[0023]
  In order to configure the upper half reflection surface of the reflector so that the reflected light radiated from the light bulb and incident on the reflection surface does not cross the central axis, the upper half reflection is performed by a single rotating quadric surface. In the case of forming the surface, the axis of the rotating quadratic curved surface may be parallel to the central axis, or may have a certain angle with respect to the central axis toward the opening end of the reflector. In addition, when the upper half reflection surface is constituted by a plurality of facets having free-form surfaces, each facet is set so that the reflected light from each facet does not cross the central axis.
[0024]
  On the other hand, in order to configure the lower half reflection surface of the reflector so that the reflected light emitted from the light bulb, incident on the reflection surface and reflected intersects the central axis, a single rotating quadric surface is used. When the upper half reflection surface is constituted byTherefore, the lower half reflective surfaceThe axis may be set so as to intersect the central axis. In addition, when the upper half reflection surface is constituted by a plurality of facets having free-form surfaces, each facet is set so that the reflected light from each facet intersects the central axis.Reflective surface axisTheTo intersect the central axisShall be set.
[0025]
  Since the upper half reflection surface and the lower half reflection surface have different configurations as described above, it is allowed that the joint portion between the two becomes a discontinuous curved surface.
[0026]
  In the present invention,The light bulb and reflector are integrated.With reflector and light bulbButIn order to regulate their optical relationship, it is fixed by interposing a member such as a base cementOrThe light bulb can be attached to and detached from the reflector.Say what. By adopting such a configuration, it is possible to replace only the light bulb while leaving the reflector intact when the light bulb is disconnected.
[0027]
  Thus, in the present invention, the light from the bulb that has entered the upper half reflecting surface of the reflector is reflected substantially parallel to the central axis.
[0028]
  On the other hand, the light from the bulb incident on the lower half reflection surface is reflected obliquely upward across the central axis.
[0029]
  Therefore, the lamp for the sign lamp was incorporated in the recessed sign lampIn stateThe reflected light from the upper half reflection surface is incident on the light incident surface of the prism substantially perpendicularly. The reflected light from the lower half reflection surface is incident obliquely below the light incident surface of the prism. Each light entering the prism is refracted according to the incident angle, and is emitted from the prism to form an elongated light beam (light column), which is projected at a low angle in front of the embedded marker lamp. And the reflected light from the upper half reflection surface is mainly responsible for the lower half of the central axis of the reflector. On the other hand, the reflected light from the lower half reflection surface mainly handles the upper half of the central axis of the reflector. As a result, a required light distribution characteristic is effectively formed.
[0030]
  In addition, in order to separate the reflector into the upper half reflection surface and the lower half reflection surface, and to make the reflected light from the lower half reflection surface cross the central axis, the lower half reflection surfaceAxis ofIs inclined upward with respect to the central axis, so that the protruding amount of the lower half of the reflector can be reduced. This realizes the downsizing of the lower size of the marker lamp.
[0031]
  Accordingly, the reflector of the marker lamp does not disturb or is less disturbed.bodyCan be made thin.
[0032]
  Also bookinventionInBeacon lamp, reflectorButAt least the upper and lower portions of the upper half reflection surface and the lower half reflection surface on the opening end side are cut substantially parallel to the central axis.
[0033]
  The prism used in the embedded marker lamp has an opening surface that is horizontally long in accordance with the light distribution characteristics. If the size of the opening end of the lamp used in such a marker lamp is adjusted to the width of the prism, the upper and lower parts of the lamp opening end will protrude outward from the prism, and the efficiency of the fixture of the embedded marker lamp will be reduced. To do. On the other hand, if the size of the opening end of the reflector of the marker lamp is adjusted to the vertical dimension of the prism of the marker lamp, the amount of light in the lateral direction of the prism is insufficient, and the required light distribution characteristics can be obtained. It becomes difficult.
[0034]
  Therefore, in the present invention, since the upper and lower portions of the opening end of the lamp are cut substantially parallel to the central axis as described above, the vertical dimension, that is, the height of the lamp for the marker lamp can be reduced. The sign lamp can be made thinner. At the same time, since the lateral opening diameter of the marker lamp can be adjusted to the lateral size of the prism, the amount of light in the left-right direction can be ensured as required. Also, the amount of light in the vertical direction isSaidSince the upper half reflection surface and the lower half reflection surface can be ensured as required, the required light distribution characteristic can be obtained with the lamp for the lamp with the minimum power consumption as a whole.
[0035]
  In cutting the upper and lower portions on the opening end side of the reflector, a part of the upper half reflection surface and the lower half reflection surface may be cut in advance, and then the reflection film may be formed, or the reflection film may be formed on the entire reflection surface. After forming the reflector, for example, the portion to be cut may be cut off by an appropriate means. In addition, the above-mentioned pre-cutting includes obtaining a structure in which a base mold is cut into a part of a reflector and a portion to be cut is removed from the time of molding.
[0036]
  Furthermore, in the present invention, in the lamp for a marker lamp, the reflector has the open end of the upper half reflection surface set back to the top side.
[0037]
  In the present invention, the light reflected from the lower half reflecting surface is kicked by the upper half reflecting surface by reversing the upper half reflecting surface to the top side from the lower half reflecting surface in the above-described configuration. Can not be.
[0038]
  With the above configuration, it is easy to realize the required light distribution characteristics by relatively increasing the solid angle of the lower half reflection surface and increasing the reflected light from the lower half reflection surface.
[0039]
  Furthermore, considering the appearance, the opening end of the upper half reflection surface can be obliquely retracted as viewed from the side, and the opening end of the lower half reflection surface can be formed obliquely continuously. .
[0040]
  Thus, in the present invention, the reflector of the lamp for the sign lamp is separated into the upper half reflection surface and the lower half reflection surface so that the reflected light of the lower half reflection surface crosses the central axis. When the marker lamp is incorporated in the embedded marker lamp, the amount of protrusion at the lower end of the reflector can be reduced, so that the lamp can be made thin.
[0041]
  Further, the thinning facilitates the boring work of the road surface for embedding. Moreover, the weight of the marker lamp can be reduced, and the handling becomes easier accordingly.
[0042]
    BookInventionIn the first aspect,Beacon lamp, reflectorButThe upper half reflection surface and the lower half reflection surface are each composed of a plurality of facets each having a free curved surface.
[0043]
  BookAspectSince each reflecting surface is composed of a plurality of facets as described above, if a desired light distribution characteristic is divided into a plurality of parts and a portion of the light distribution characteristic divided for each facet is assigned, The free-form surface of each facet can be designed. For this reason, desired light distribution characteristics can be easily realized.
[0044]
    BookInventionIn the second aspect,Beacon lamp, reflectorButAt least the upper and lower portions of the upper half reflection surface and the lower half reflection surface on the opening end side are cut substantially parallel to the central axis.
[0045]
  The prism used in the embedded marker lamp has an opening surface that is horizontally long in accordance with the light distribution characteristics. If the size of the opening end of the lamp used in such a marker lamp is adjusted to the width of the prism, the upper and lower parts of the lamp opening end will protrude outward from the prism, and the efficiency of the fixture of the embedded marker lamp will be reduced. To do. On the other hand, if the size of the opening end of the reflector of the marker lamp is adjusted to the vertical dimension of the prism of the marker lamp, the amount of light in the lateral direction of the prism is insufficient, and the required light distribution characteristics can be obtained. It becomes difficult.
[0046]
  So bookAspectSince the upper and lower portions of the opening end of the lamp are cut substantially parallel to the central axis as described above, the vertical dimension, that is, the height of the lamp for the lamp can be reduced. Can be thin. At the same time, since the lateral opening diameter of the marker lamp can be adjusted to the lateral size of the prism, the amount of light in the left-right direction can be ensured as required. Also, the amount of light in the vertical direction isSaidSince the upper half reflection surface and the lower half reflection surface can be ensured as required, the required light distribution characteristic can be obtained with the lamp for the lamp with the minimum power consumption as a whole.
[0047]
  In cutting the upper and lower portions on the opening end side of the reflector, a part of the upper half reflection surface and the lower half reflection surface may be cut in advance, and then the reflection film may be formed, or the reflection film may be formed on the entire reflection surface. After forming the reflector, for example, the portion to be cut may be cut off by an appropriate means. In addition, the above-mentioned pre-cutting includes obtaining a structure in which a base mold is cut into a part of a reflector and a portion to be cut is removed from the time of molding.
[0048]
    BookInventionIn the third aspect,The indicator lamp isSaidReflectorButA joint formed between adjacent curved surfaces and extending from the top side to the opening end side; the bulb includes a pair of leg portions extending from both ends of the filament, The reflector is disposed so as to face the junction of the reflector.
[0049]
  BookAspectIn this case, the “joint formed between adjacent curved surfaces” refers to a portion between a pair of adjacent facets or between the upper half reflection surface and the lower half reflection surface. Since the different curved surfaces are adjacent to each other, the curved surface is discontinuous at the joint.
[0050]
  Further, “extending from the top side to the opening end side” means that joints are formed radially around the top when the reflector is viewed from the opening end side.
[0051]
  Furthermore, the joint portion is not only linear and has almost no width, but also can have an appropriate width if necessary. By giving the joint portion a width, the attachment angle of the leg portion with respect to the reflector can be somewhat varied, so that assembly and adjustment are facilitated. However, in the case of having an appropriate width as described above, it is preferable to make the junction part light diffusive or light-shielding to minimize the influence of light incident on the junction on the light distribution. . It is desirable to keep the width to the minimum necessary. To make it light diffusive or light-shielding, a known means may be used.
[0052]
  Next, the bulb filament is preferably a C-8 type extending along the axis of the bulb, but the present invention is not limited to this, and the C-6 type and other types can also be used. The effects described below can occur essentially.
[0053]
  By the way, when the shadow of the leg portion of the filament is reflected on the reflecting surface of the reflector, the light emitted from the filament should be incident on the reflecting surface and should be reflected as desired to contribute to the light distribution. A part of the emitted light is kicked by the leg portion and cannot enter the reflecting surface, and the effective light amount is lost accordingly. In addition, the light distribution is likely to be disturbed.
[0054]
  In contrast, the bookAspectIn, the shadow of the leg part mainly enters the opposing joint part. Since the junction cannot originally contribute to the desired reflection, the loss of the effective light amount hardly occurs. Moreover, the light distribution is not disturbed.
[0055]
    BookThe embedded beacon lamp device of the invention isThe present inventionAn embedded marker lamp; a base supporting a peripheral portion of the implantable marker lamp and a recess for storing the implantable marker lamp; and a base embedded in the road surface; And a fixing means for detachably fixing to the table.
[0056]
  Boring the road surface and burying the base beforehand. Electrical wiring is set up from the ground via the base. The embedded marker lamp is stored in the base and fixed to the base by fixing means such as bolts.
[0057]
  Thus, since the present invention embeds the embedded marker lamp through the base, maintenance such as lamp replacement can be performed by removing the entire marker lamp or a part thereof, for example, the upper lamp body from the site and newly preparing the marker lamp. The beacon lamp can be exchanged for all or a part of it, and can be carried out by bringing it back from the site to the factory and taking necessary measures.
[0058]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0059]
    FIG. 1 is a plan view showing an embodiment of an embedded marker lamp apparatus according to the present invention.
[0060]
    2 is a cross-sectional view taken along the line II-II ′ of FIG.
[0061]
  In the figure, the embedded type marker lamp device includes an embedded marker lamp A and a base B.
[0062]
  For the embedded marker lamp A, 1 is a lamp, 2 is a prism, 3 is a lamp for a marker lamp, and 4 is a color filter.
[0063]
  The lamp body 1 is composed of an upper lamp body 1a and a lower lamp body 1b that is liquid-tightly covered with an under surface of the upper lamp body 1a via an O-ring 5, and an internal space 1c is formed therebetween. On the upper surface of the upper lamp body 1a, a pair of light guide grooves 1d extending obliquely upward are formed in opposite directions and shifted from each other. And the upper surface center area | region of the top lamp 1a is the flat part 1e, and the circumference | surroundings become the inclined surface 1f. The light guide groove 1d is opened across the flat portion 1e on the upper surface and the inclined surface 1f. 1g is an attachment hole for attaching the upper lamp 1a formed in the peripheral part to the lower lamp 1b and the base B.
[0064]
  The prism 2 is disposed at a connection portion between the light guide groove 1d and the internal space 1c.
[0065]
  As will be described in detail later, the marker lamp 3 includes a reflector 3a and a light bulb 3b housed inside the reflector 3a. The lamp 3 is mounted on the lamp upper portion 1a by a conventional method (not shown) and is connected to each prism in the internal space 1c. A pair is arranged opposite to 2 and 2.
[0066]
  The color filter 4 is disposed in front of the light incident portion of the prism 2. The color light to be projected is determined for each installation place of the embedded marker lamp.
[0067]
  Next, the marker lamp will be described with reference to FIGS.
[0068]
    FIG. 3 is a side view showing the first embodiment of the marker lamp according to the present invention.
[0069]
    FIG. 4 is a longitudinal sectional view along a plane including the central axis.
[0070]
    FIG. 5 is a front view showing the reflector.
[0071]
    FIG. 6 is a longitudinal sectional view along a plane including the central axis.
[0072]
    FIG. 7 is also a cross-sectional view.
[0073]
  In each figure, the same parts as those in FIG.
[0074]
  The reflector 3a of the marker lamp 3 is composed of an upper half reflection surface 3a1 and a lower half reflection surface 3a2 with the central axis X-X 'as a boundary.
[0075]
  And upper half part reflective surface 3a1 consists of a plurality of facets 3a5. Each facet 35 is composed of a free-form surface that approximates a paraboloid of revolution. The free-form surface is radiated from the light bulb 3b, and the light incident on the upper half reflection surface 3a1 is substantially parallel to the central axis XX ′. Is set to be reflected.
[0076]
  On the other hand, the lower half reflection surface 3a2 is similarly composed of a plurality of facets 3a5. Each facet 3a5 is similarly composed of a free-form surface approximating a paraboloid, but the free-form surface is radiated from the light bulb 3b and the light incident on the lower half reflection surface 3a2 with respect to the central axis XX ′ It is set to be reflected in the direction of crossing at an angle.
[0077]
  Furthermore, since the upper part and the lower part on the opening end side of the reflector 3a are cut to form the cut portions 3a3 and 3a4, the reflector 3a has a horizontally long shape when viewed from the front.
[0078]
  Furthermore, when the reflector 3a is viewed from the lateral direction, the opening end thereof is slanted, but this causes the opening end of the upper half reflection surface 3a1 to recede from the opening end of the lower half reflection surface 3a2 to the top side. This is because the opening end of the lower-half reflection surface is further obliquely retracted accordingly.
[0079]
  On the other hand, the light bulb 3b includes a cylindrical bulb 3b1 made of quartz glass, and a filament 3b2 sealed inside the bulb 3b1. The light bulb 3b is disposed such that the filament 3b2 is positioned at a predetermined position of the reflector 3a, for example, the center of the filament 3b2 is substantially at the focal point of the paraboloid of revolution.
[0080]
  More specifically, the valve 3b1 has a structure in which the proximal end is pinch-sealed and the distal end is chipped off. A pair of metal foils 3b3 are embedded in the pinch seal portion 3b11 so as to be spaced apart from each other, and a pair of leg portions 3b4, 3b4 'extends from the metal foil 3b3 into the valve 3b1. A pair of cap pins 3b5 protrudes from the metal foil 3b3 to the outside of the valve 3b1.
[0081]
  The leg portions 3b4 and 3b4 'extend from both ends of the filament 3b2, energize the filament 3b2, and mechanically support the filament 3b2.
The filament 3b2 forms a C-8 type coil, that is, a coil arranged so that its axis substantially coincides with the axis of the valve 3b1. In many cases, the coil is a double coil or a single coil.
Therefore, the leg portion 3b4 on the tip side of the bulb 3b1 of the filament 3b2 extends substantially parallel to the filament 3b2. In this embodiment, the leg portion 3b4 is removed from the upper part of the paraboloid of the reflector 3a. It faces the portion 3a3. However, if necessary, the leg portion 3b4 may be disposed so as to face the joint portion between the upper half reflection surface 3a1 and the lower half reflection surface 3a2.
[0082]
  The light bulb 3b is constituted by a halogen light bulb in which an appropriate amount of halogen such as iodine or bromine is sealed inside the bulb 3b1.
[0083]
  The base cement 3c is fixed to a predetermined position of the reflector 3a by cantilever support by fixing a pinch seal portion 3b11 formed at the base end of the light bulb 3b in the neck portion 3a6 of the reflector 3a to the neck portion 3a2. is doing.
[0084]
    FIG. 8 is a front view showing a second embodiment of the marker lamp according to the present invention.
[0085]
  In the figure, the same parts as those in FIG. 3 to FIG.
[0086]
  This embodiment is different in that the leg portions 3b4 and 3b4 'of the filament 3b2 are configured not to be reflected on the upper half reflection surface 3a1 and the lower half reflection surface 3a2.
[0087]
  In the present embodiment, the leg portions 3b4 and 3b4 'are configured to face the joint portion of the facet 3a5.
[0088]
  Further details are as follows. A pair of facets 3a5 divided into left and right is formed by disposing a joint 3a6 extending in the longitudinal direction at the center of each of the upper half reflection surface 3a1 and the lower half reflection surface 3a2. Further, a joining portion 3a7 extending in the lateral direction is also formed between the upper half reflection surface 3a1 and the lower half reflection surface 3a2.
[0089]
  In the illustrated case, the leg portions 3b4 and 3b4 ′ are opposed to the joint portion 3a6. Therefore, the shadows of the leg portions 3b4 and 3b4 ′ are mainly incident on the joint portion 3a6, and the curved surface portion constituting the reflection surface. Substantially does not enter. However, the leg portions 3b4 and 3b4 'may be opposed to the joint portion 3a7.
[0090]
  In this way, the leg portions 3b4, 3b4 'may be directly opposed to any of the joint portions 3a6 and 3a7, so that the degree of freedom in assembly is increased.
[0091]
    FIG. 9 is a front view showing a third embodiment of the marker lamp according to the present invention.
[0092]
  In the figure, the same parts as those in FIG.
[0093]
  In the present embodiment, a joint 3a9 extending in an oblique direction is further added to the upper half reflection surface 3a1 and the lower half reflection surface 3a2 as compared with FIG. 8, and the number of facets 3a5 is doubled. It is a thing. The leg portions 3b4 and 3b4 'may be opposed to the joint portion 3a9.
[0094]
    FIG. 10 is a front view showing a fourth embodiment of the marker lamp according to the present invention.
[0095]
  In the figure, the same parts as those in FIG.
[0096]
  This embodiment is different in that a slight width is given to the joint portion 3a6 'that directly faces the leg portions 3b4 and 3b4'.
[0097]
  That is, the joint portion 3a6 'is between the adjacent facets 3a5 and forms a diffuse reflection surface or a light shielding surface. If the leg portions 3b4 and 3b4 'of the filament 3b2 are opposed to some part of the joint portion 3a6', there will be no problem associated with the reflection of the shadow of the leg portions 3b4 and 3b4 '.
[0098]
  However, since the efficiency of the reflector 3b decreases as the width of the joint 3a6 'increases, it is preferable that the width is as narrow as possible.
[0099]
    FIG. 11 is a cross-sectional view taken along the line II-II ′ of FIG. 1 showing the optical action in an embodiment of the embedded marker lamp of the present invention.
[0100]
  In the figure, the same parts as those in FIG.
[0101]
  A light ray R1 emitted from the light bulb 3b toward the upper half reflection surface 3a1 is reflected substantially parallel to the central axis X-X 'of the reflector 3a and enters the color filter 4 and the prism 2 at a right angle. The light ray R1 is refracted by the prism 2 and projected in a substantially horizontal direction.
[0102]
  On the other hand, the light ray R2 radiated from the light bulb 3b toward the lower half reflection surface 3a2 is reflected upward across the central axis XX ′ of the reflector 3a, and is slightly oblique to the color filter 4 and the prism 2. Incident light. The light ray R2 is refracted by the prism 2 and projected slightly upward with respect to the horizontal line.
[0103]
  As described above, the light radiated from the light bulb 3b is divided into two by the reflection at the upper half reflection surface 3a1 and the lower half reflection surface 3a2, and is slightly in angle via the prism 2, respectively. However, the required light distribution characteristics are satisfied by projecting in different directions.
[0104]
    FIG. 12 is a light distribution characteristic diagram showing an example of the standard of the light distribution characteristic in the embedded type marker lamp.
[0105]
  In the figure, the horizontal axis represents the horizontal angle (degree), and the vertical axis represents the vertical angle (degree).
[0106]
  A curve m indicates a main light column curve, and a curve s indicates a 10% light column curve.
[0107]
  This standard requires that the lowest average luminous intensity is 200 Cd and the lowest luminous intensity is 100 Cd within the angle range (horizontal angle ± 10 °, vertical angle 1-8 °) surrounded by the main light column curve m. Further, it is required that the minimum luminous intensity within an angle range (horizontal angle ± 16 °, vertical angle 0 to 13 °) surrounded by the 10% light column curve s is 20 Cd.
[0108]
  According to the embedded marker lamp of the present invention, an example of the standard of the light distribution characteristic shown in FIG. 12 can be easily satisfied.
[0109]
  The base B will be described again with reference to FIG. 11 is an inner peripheral step, 12 is a standing wall, 13 is a central recess, and 14 is a mounting hole. Although not shown, a power cable introduction hole is formed on the side surface of the base B.
[0110]
  The inner peripheral step portion 11 supports the peripheral portion of the lamp body 1 in order to mount the embedded marker lamp A slightly floating from the bottom surface of the lamp body 1.
[0111]
  The upright wall 12 surrounds and protects the side surface of the embedded marker lamp A. The base b is embedded in the road surface G up to the upper end of the upright wall 12.
[0112]
  The central recess 13 is used to store the lamp body 1 in a liquid-tight manner at the center thereof via an O-ring 15 and to perform necessary electrical wiring (not shown) for the marker lamp A.
[0113]
    FIG. 13 is a plan view of the lower lamp body in an embodiment of the embedded marker lamp of the present invention.
[0114]
  As apparent from FIG. 2, the lower lamp body 1b has a dish shape having a flange portion 1b1 on the outer periphery, and a through hole 1b2 formed in the flange portion 1b1 connects the lower lamp body 1b to the upper lamp body 1a. It is for attaching to. The through hole 1b3 is for attaching the upper lamp body 1a to the lower lamp body and the base B.
[0115]
  Thus, the lower lamp body 1 b and the base B are liquid-tight by the O-ring 16.
[0116]
    FIG. 14 is a plan view of a base in an embodiment of the embedded marker lamp apparatus of the present invention.
[0117]
  In the figure, 17 is a mounting hole for mounting the lower lamp 1b. Since other parts have already been described in FIG.
[0118]
【The invention's effect】
    BookAccording to the invention,The light bulb and reflector of the sign lamp are integrated,When light emitted from the bulb filament is incident on the upper half reflection surface, it is reflected in a direction that does not cross the central axis, and light from the bulb incident on the lower half reflection surface is reflected in a direction that intersects the central axis. LikeThe,By reducing the amount of protrusion in the lower half of the reflector, and most of the lamps for sign lamps are located below the road surface, the protrusion height of the lamp body on the road surface is reduced, and from the lower half reflection surface The reflected light from the upper half will not be kicked by the upper half reflection surface and the required light distribution characteristics will be obtained easily.lightbodyTheOne layerThinEmbedded typeA beacon light can be provided.
[0119]
    In addition, the upper half reflection surface and the lower half reflection surface of the reflector are each composed of multiple facets with free-form surfacesifHave the desired light distribution characteristicsEmbedded typeA beacon light can be provided.
[0120]
    In addition, cut the upper and lower parts on the opening end side of the reflectorifThe vertical height can be reduced, and the horizontal size is adjusted to the horizontal size of the prism, thereby improving the efficiency of the fixture and using the light bulb with the minimum power consumption. Satisfy light distribution characteristicsEmbedded typeA beacon light can be provided.
[0121]
    In addition, the leg portion of the filament of the bulb is opposed to a joint portion extending from the top side to the opening end side between adjacent curved surfaces.IfBecause the shadow of the leg does not enter the curved surface of the reflecting surface, there is little loss of effective lightEmbedded typeA beacon light can be provided.
[0122]
    BookinventionAccording to,ThatWhile the base can be embedded in the road surface in advance,Recessed beacon lamp of the present inventionIt is possible to provide an embedded marker lamp apparatus having the effects described above.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of an embedded marker lamp apparatus according to the present invention.
2 is a cross-sectional view taken along the line II-II ′ of FIG.
FIG. 3 is a side view showing a first embodiment of a marker lamp according to the present invention.
FIG. 4 is a longitudinal sectional view along the same plane including the central axis.
FIG. 5 is a front view of the reflector.
FIG. 6 is a longitudinal sectional view along the same plane including the central axis.
[Fig. 7] Cross-sectional view of the same
FIG. 8 is a front view showing a second embodiment of the lamp for a marker lamp of the present invention.
FIG. 9 is a front view showing a third embodiment of a marker lamp according to the present invention.
FIG. 10 is a front view showing a fourth embodiment of a marker lamp according to the present invention.
11 is a cross-sectional view taken along the line II-II ′ of FIG.
FIG. 12 is a light distribution characteristic diagram showing the standard of the light distribution characteristic in the embedded type marker lamp.
FIG. 13 is a plan view of a lower lamp body in an embodiment of the embedded marker lamp of the present invention.
FIG. 14 is a plan view of a base in an embodiment of the embedded marker lamp apparatus according to the present invention.
FIG. 15 is a cross-sectional view of the optical axis portion of the embedded marker lamp of the prior invention.
FIG. 16 is a cross-sectional view of a lamp for a sign lamp
[Explanation of symbols]
      A ... Recessed beacon
      B ... Base
      G ... Road surface
      R1 ... Ray
      R2 ... Ray
      1 ... Lamp
      1a ... Upper lamp
      1b ... Lower lamp
      1b1 ... Flange
      1c ... Interior space
      1d: Light guide groove
      1e ... Flat part
      1f ... Inclined surface
      1g ... Mounting hole
      2 ... Prism
      3 ... Lamp for beacon lamp
      3a ... Reflector
      3a1 ... Upper half reflection surface
      3a2 ... Lower half reflection surface
      3a5 ... Facet
      3b ... Light bulb
      4. Color filter
      5 ... O-ring
      11 ... Inner peripheral step
      12 ... Standing wall
      13 ... Central recess
      14 ... Mounting hole
      15 ... O-ring
      16 ... O-ring

Claims (5)

A light guide groove disposed on the upper surface and directed obliquely upward and having a leading end portion substantially at the same position as the road surface and an internal space communicating with the light guide groove;
A light path regulating prism disposed in a liquid-tight manner between the light guide groove and the internal space of the lamp body and refracting incident light downward ;
The light bulb has an integrated light bulb and a reflector, the light bulb has a bulb and a filament sealed inside the bulb, the reflector has the light bulb arranged inside, and the reflected light of the light emitted from the light bulb intersects the central axis. An upper half reflecting surface configured so as not to have, and a lower half reflecting surface in which the axis of the reflecting surface intersects the central axis so that the reflected light of the light emitted from the bulb intersects the central axis, When the reflector is viewed from the side, the opening end of the upper half reflection surface is retracted from the opening end of the lower half reflection surface toward the top, faces the prism, and the upper half reflection surface faces upward. A lamp for a sign lamp disposed in the interior space of the body so that most of the lamp is located below the road surface ;
An embedded beacon lamp characterized by comprising: 2. The embedded sign according to claim 1, wherein the lamp for the marker lamp includes a plurality of facets each having an upper half reflection surface and a lower half reflection surface each having a free curved surface. light. 2. The lamp for a sign lamp, wherein the reflector has an upper and lower reflective surfaces at least at upper and lower portions on the opening end side that are cut substantially parallel to the central axis. 2. The embedded beacon lamp according to 2. The lamp for a marker lamp includes a joint in which the reflector extends from the top side to the opening end side between adjacent curved portions, and the light bulb has a pair of leg portions extending from both ends of the filament. The embedded beacon lamp according to any one of claims 1 to 3, characterized in that the leg part is disposed on the reflector so as to be opposed to the joint part of the reflector. An embedded beacon lamp according to any one of claims 1 to 4 ;
A base that is provided with a step for supporting the periphery of the embedded marker lamp and a recess for storing the embedded marker lamp; and a base that is embedded in the road surface; and a fixing that detachably fixes the embedded marker lamp to the base. Means;
An embedded marker lamp apparatus comprising:

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