JPH11195313A - Lamp for marker light, embedded marker light, and embedded marker light device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embedded marker light and an embedded marker light device whose light body is made thin and is provided with a lamp which is easy to attain desired light distribution. SOLUTION: A lamp for a marker light has an electric bulb 3b which has a filament, and a reflector 3a where the electric bulb 3b is installed. The reflector 3a consists of an upper half reflecting surface 3a1 and a lower half reflecting surface 3a2. The upper half reflecting surface 3a1 is arranged so that the reflected light from the focal point does not intersect with the central axis while the lower half reflecting surface 3a2 is arranged so that the reflected light from the focal point intersects with the central axis. The upper and lower parts of the reflector 3a can be cut to reduce the dimensions of a lamp for the marker light. The open end of the upper half reflecting surface 3a1 can be retracted so that the upper half reflecting surface 3a1 does not shade the reflected light from the lower half reflecting surface 3a2. An embedded marker light has in its lamp body a prism for defining the optical path, placed between a light emission groove and an inner space, and the lamp for the marker light is placed in the inner space opposing the prism. An embedded marker light device has an embedded marker light stored therein and fixed on a base that is embedded in a road surface in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sign lamp, a recessed sign lamp using the same, and a recessed sign lamp device.

[0002]

2. Description of the Related Art The present inventors have invented a downsized lamp for a sign lamp, a downsized beacon lamp and a downsized beacon lamp apparatus using this lamp, and have disclosed the same in Japanese Patent Application No. Hei. 2627
Patent Application No. 09 has been filed.

[0005] FIG. 15 is a cross-sectional view of the embedded marker light device of the prior invention in the optical axis portion.

FIG. 16 is a cross-sectional view of a marker lamp.

In the figure, 101 is a lamp body, 102 is a prism, 103 is a lamp for marker lights, and 104 is a base.

[0006] The lamp body 101 has an inner space 1 communicating with the light guide groove 101a and the light guide groove 101a provided on the upper surface.
01b. Further, the lamp body 101 includes an upper lamp body 101c and a lower lamp body 101d covered by the upper lamp body 101c.

The prism 102 is disposed between the light guide groove 101a of the lamp body 101 and the internal space 101b in a liquid-tight manner, and regulates the optical path so as to have a low angle with respect to the road surface.

As shown in FIG. 16, the marker lamp 103 has a light bulb 103b in advance inside a reflector 103a, and the center of the filament 103b1 is positioned substantially at the focal point of the reflection surface 103a1 having a single paraboloid of revolution. In this way, it is fixed and integrated with the die cement 103c. The reflector 103a has a cylindrical portion 103a2 integrally formed on the top thereof, and the cylindrical portion 103a2
The sealing portion 103b1 of the light bulb 103b is inserted into the inside, and a base cement 103c is poured into a gap between them to be fixed.

Further, the marker lamp 103 is provided with a cut portion 103a at an upper portion on the opening end side of the reflector 103a.
3 is formed. And FIG.
As shown in the figure, in the lamp body 101 of the recessed marker light,
Since the reflector 103a is provided so as not to protrude above the prism 102, the reflector 103a
Is made to enter the prism 102 as much as possible.

In FIG. 15, G indicates a road surface on which a marker lamp is buried.

[0011] Thus, the buried marker light has its lamp body 10.
1 is buried in the road surface G with its upper surface exposed, and used.
In addition, the sign lamp 103 is provided with a reflector 103.
a and the light bulb 103b are held and fixed in a predetermined positional relationship in advance, so that the optical adjustment of the recessed marker light is easy, and the cut portion 10 is provided above the reflector 103a.
Since 3a3 was formed, the height dimension in the embedded marker lamp was significantly reduced.

[0012] For this reason, the embedding depth of the embedding type marker lamp can be considerably reduced.

[0013]

However, there is a demand for a further reduction in the size of the recessed marker light, and it is hoped that a lamp for the recessed lamp, a recessed marker lamp, and a recessed marker device will respond to this demand. It is rare.

In addition, in the embeddable sign lamp for airports, it is necessary to satisfy a light distribution characteristic of maintaining a predetermined luminous intensity in a small elevation angle range and a large horizontal angle range in the right and left directions. It is not easy to satisfy the light distribution characteristics by using a sign lamp having the minimum power consumption.

According to the present invention, a reflector for a sign lamp can be improved so that the lamp body of the sign lamp can be made thinner and the required light distribution characteristics can be easily obtained. An object of the present invention is to provide an embedded marker light and an embedded marker light device used.

[0016]

According to the first aspect of the present invention, there is provided a lamp for a sign light, comprising: a bulb having a bulb and a filament sealed inside the bulb; a bulb disposed inside the bulb and radiated from the bulb. A reflector having an upper half reflecting surface configured to prevent reflected light of the light from intersecting with the central axis and a lower half reflecting surface configured to cause reflected light of light emitted from the light bulb to intersect with the central axis; It is characterized by having.

The definitions and technical meanings of the terms in the present invention and each of the following inventions are as follows.

The marker lamp of the present invention is most suitable for an embedded marker lamp, but is not limited thereto, and is applicable to an exposure lamp. In addition, the application of the recessed marker light is not limited, such as for airports and roads.

The light bulb is preferably a halogen light bulb in terms of small high light output. However, since a relatively small high light output can be obtained even with a krypton or xenon gas-filled light bulb, a small high light output may not be required. The use of other bulbs, including, is allowed. Although some halogen bulbs have an infrared reflective film formed on the surface of the bulb, this configuration is suitable for the present invention because of its high luminous efficiency.

The reflector preferably has a reflective film having a high reflectance applied to the inner surface of the substrate. However, if the substrate itself is made of a material having a high reflectance, for example, high-purity aluminum, a reflective film is applied separately. You don't have to. Further, glass or metal is suitable as the substrate.

"Central axis" refers to the geometric center line of the reflector which is determined independently of the optical action of the reflector.

In order to configure the upper half reflecting surface of the reflector so that the reflected light radiated from the bulb, incident on the reflecting surface and reflected does not cross the central axis, a single rotating quadric surface is used. In the case of forming the half-reflection surface, the axis of the quadric surface of revolution may be made parallel to the central axis, or may have a certain angle with respect to the central axis toward the opening end of the reflector. When the upper half reflecting surface is formed by a plurality of facets having a free-form surface, each facet is set so that the light reflected by each facet does not cross the central axis.

On the other hand, in order to configure the lower half reflecting surface of the reflector so that the reflected light radiated from the bulb, incident on the reflecting surface and reflected crosses the central axis, a single rotation is required. In the case where the upper half reflecting surface is constituted by the quadratic curved surface, the axis of the rotating quadratic curved surface may be set to intersect with the central axis. When the upper half reflecting surface is formed by a plurality of facets having a free-form surface, each facet is set so that the light reflected by each facet intersects the central axis.

Since the upper half reflecting surface and the lower half reflecting surface have different structures as described above, the joint between them is allowed to be a discontinuous curved surface.

Incidentally, it is preferable that the reflector and the electric bulb are fixed to each other with a member such as a base cement interposed therebetween in order to regulate their optical relationship. However, if necessary, the bulb can be made detachable from the reflector. When such a configuration is employed, it is possible to replace only the bulb while leaving the reflector when the bulb is disconnected.

Thus, in the present invention, the light of the bulb incident on the upper half reflecting surface of the reflector is reflected substantially parallel to the central axis.

On the other hand, the light from the bulb incident on the lower half reflecting surface is reflected obliquely upward across the central axis.

Therefore, when the marker lamp is incorporated in a recessed marker lamp, the light reflected from the upper half reflecting surface enters the light entering surface of the prism substantially at right angles. The reflected light from the lower half reflecting surface enters the light entering surface of the prism from obliquely below. The light entering each prism is refracted according to the incident angle, and emitted from the prism to form an elongated light beam (light column), which is projected at a low angle forward of the embedded marker lamp. And the reflected light from the upper half reflecting surface is
Responsible mainly for the lower half of the central axis of the reflector. On the other hand, the light reflected from the lower half reflecting surface mainly covers the upper half of the central axis of the reflector. As a result, required light distribution characteristics are effectively formed.

Further, in order to separate the reflector into an upper half reflecting surface and a lower half reflecting surface and to allow the reflected light from the lower half reflecting surface to cross the central axis, the lower half reflecting surface is required. Since the reflector is inclined upward with respect to the central axis, the amount of protrusion of the lower half of the reflector can be reduced. This achieves a reduction in the size of the sign lamp, especially on the lower side.

Therefore, since the reflector of the marker lamp does not obstruct, or does not obstruct, the reflector of the marker lamp can be made thinner accordingly.

According to a second aspect of the present invention, there is provided the sign lamp according to the first aspect, wherein the reflector includes a plurality of facets each having an upper half reflecting surface and a lower half reflecting surface each having a free curved surface. Is characterized by the following.

According to the present invention, since each reflecting surface is constituted by a plurality of facets as described above, a desired light distribution characteristic is divided into a plurality of parts, and a part of the light distribution characteristic divided for each facet is divided. When assigned, the free-form surface of each facet can be designed accordingly. Therefore, desired light distribution characteristics can be easily realized.

According to a third aspect of the present invention, there is provided a beacon lamp according to the first or second aspect, wherein the reflector has at least an upper and lower upper and lower reflecting surfaces at the opening end side of the upper half reflecting surface and the lower half reflecting surface. The portion is cut substantially parallel to the central axis.

The prism used in the buried marker light has a horizontally long opening surface in accordance with the light distribution characteristics. When the size of the opening end of the lamp used for such a sign lamp is adjusted to the width of the prism, the upper and lower parts of the opening end of the lamp protrude outward from the prism and the fixture efficiency of the recessed sign lamp decreases. I do. On the other hand, if the size of the opening end of the reflector of the sign lamp is adjusted to the vertical dimension of the prism of the sign lamp, the light quantity in the left and right directions of the prism is insufficient, and the required light distribution characteristics can be obtained. It becomes difficult.

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 sign lamp can be reduced. Recessed marker lights can be made thinner. At the same time, the lateral opening diameter of the sign lamp can be adjusted to the lateral size of the prism, so that the required amount of light in the left-right direction can be secured.
Further, since the amount of light in the vertical direction can be secured as required by the configuration of the upper half reflecting surface and the lower half reflecting surface defined in claim 1 or 2, it is necessary to use a sign lamp having the minimum power consumption as a whole. Light distribution characteristics can be obtained. .

In cutting the upper and lower sides of the opening end side of the reflector, a part of the upper half reflecting surface and the lower half reflecting surface may be cut in advance, and then the reflecting film may be formed. After the reflector is formed by forming a reflective film on the surface, a 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 part of the reflector is cut from a mold of the substrate and a part to be cut has already been removed from the molding.

According to a fourth aspect of the present invention, there is provided the sign lamp according to the third aspect, wherein the reflector has an opening end of the upper half reflecting surface receding to the top. .

In the present invention, the light reflected from the lower half-reflecting surface is made to retreat from the lower half-reflecting surface to the top side by retreating the upper half-reflecting surface to the top side from the lower half-reflecting surface. Can be prevented from being kicked.

According to the above configuration, the solid angle of the lower half reflecting surface is relatively increased, and the amount of light reflected from the lower half reflecting surface is increased, so that the required light distribution characteristics can be easily realized. .

Further, in consideration of the external appearance, the opening end of the upper half reflecting surface is obliquely receded when viewed from the lateral direction, and the opening end of the lower half reflecting surface is also formed obliquely in succession. be able to.

According to a fifth aspect of the present invention, there is provided a beacon lamp according to any one of the first to fourth aspects, wherein the reflector is formed between adjacent curved portions different from each other and opened from the top side. The bulb includes a pair of legs extending from both ends of the filament and disposed on the reflector such that the legs are positioned opposite the junction of the reflector. Are characterized;

In the present invention, "a joint formed between adjacent curved portions different from each other" means a portion between a pair of adjacent facets or a portion between an upper half reflecting surface and a lower half reflecting surface. In other words, since different curved surfaces are adjacent to each other across the joint, the curved surface is discontinuous at the joint.

Also, "extends from the top to the open end".
This means that when the reflector is viewed from the opening end side, the joining portion is formed radially around the top.

Further, the joint portion is not only formed in a linear shape and has almost no width, but also can be given an appropriate width as needed. By providing the joint with a width, the angle of attachment of the leg to the reflector may vary to some extent, which facilitates assembly and adjustment. However, when having an appropriate width as described above, it is preferable that the junction be made to have a light diffusing property or a light shielding property so that the light incident on the junction has no influence on the light distribution. . It is also desirable to keep the width to the minimum necessary. Known means may be used for light diffusion or light blocking.

Next, the C-8 type filament extending along the axis of the bulb is suitable for the filament of the bulb, but the present invention is not limited to this, and other filaments including the C-6 type can be used. The type described below can also essentially produce the effects described below.

By the way, if the shadow of the leg portion of the filament is reflected on the reflection surface of the reflector, the light emitted from the filament should be incident on the reflection surface and should be reflected as desired to contribute to the light distribution. However, a part of the light emission is kicked by the leg portion and cannot enter the reflection surface,
As a result, the effective light amount is lost. In addition, light distribution tends to be disturbed.

On the other hand, according to the present invention, the shadow of the leg portion mainly enters the opposing joint portion. Since the joint cannot originally contribute to the desired reflection, little loss of the effective light amount occurs. Also, the light distribution is not disturbed.

A recessed marker lamp according to a sixth aspect of the present invention is provided with a lamp body provided on the upper surface and having a light guide groove extending obliquely upward and an internal space communicating with the light guide groove; An optical path regulating prism disposed in a liquid-tight manner between the groove and the internal space; and disposed in the internal space of the lamp body facing the prism and with the upper half reflecting surface facing upward. And a lamp for a marker light according to any one of (5) to (5).

The recessed marker light of the present invention can be applied to a desired use such as a runway centerline light, a taxiway light, a stop line light for an airport, and an intersection mark for a road.

It is necessary to irradiate the light at a small elevation angle with respect to the road surface in this type of step-on sign lamp, 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. is there. Therefore, an optical path radiated from the lamp is refracted in the direction of the road surface 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.

Thus, in the present invention, the reflector of the sign lamp is separated into an upper half reflecting surface and a lower half reflecting surface so that the reflected light from the lower half reflecting surface crosses the central axis. This makes it possible to reduce the amount of protrusion of the lower end portion of the reflector when the sign lamp is incorporated in the recessed sign lamp, and thus the lamp can be made thin.

Further, the boring work on the road surface for embedding is facilitated by the reduction in thickness. In addition, the weight of the sign lamp can be reduced, and accordingly, the handling becomes easy.

According to a seventh aspect of the present invention, there is provided a recessed marker light device, wherein the recessed marker lamp according to the sixth aspect is housed; And a base buried in the road surface; and fixing means for removably fixing the recessed marker light to the base.

A base is buried in advance by boring a road surface. The electric wiring is started up from underground through the base. The recessed marker lamp is housed in a base and fixed to the base by fixing means, for example, bolts.

In this way, since the present invention embeds the recessed marker light through the base, maintenance such as replacement of the lamp can be performed by removing all or a part of the marker lamp, for example, by removing the upper lamp body from the site and newly preparing the lamp. It can be performed by replacing all or a part of the sign lights that have been removed and removing the removed sign lights from the site to the factory and taking necessary measures.

[0056]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing one embodiment of the recessed marker light device of the present invention.

FIG. 2 is a sectional view taken along the line II-II ′ of FIG.

In the figure, the embedded marker light device comprises an embedded marker light A and a base B.

Regarding the embedded marker light A, 1 is a lamp body, 2 is a prism, 3 is a lamp for marker lights, and 4 is a color filter.

The lamp 1 includes an upper lamp 1a and an upper lamp 1
A lower lamp body 1b is provided on the lower surface of a through an O-ring 5 in a liquid-tight manner, and an internal space 1c is formed therebetween. On the upper surface of the upper lamp body 1a, a pair of light-guiding grooves 1d directed obliquely upward is formed in the opposite directions and shifted from each other. The central area of the upper surface of the upper lamp body 1a is a flat portion 1e, and the periphery thereof is an inclined surface 1f. The light guide groove 1d has a flat portion 1e on the upper surface and an inclined surface 1f.
It is open across. Reference numeral 1g denotes a mounting hole for mounting the upper lamp body 1a formed in the peripheral portion to the lower lamp body 1b and the base B.

The prism 2 has a light guiding groove 1 d and an internal space 1.
It is arranged at the connection site with c.

As will be described in detail later, the marker lamp 3 comprises a reflector 3a and a light bulb 3b housed inside the reflector 3a. A pair is disposed opposite to each of the prisms 2 and 2.

The color filter 4 is provided in front of the light entrance of the prism 2. The color light to be projected is determined for each installation location of the embedded marker light.

Next, the marker lamp will be described with reference to FIGS.

FIG. 3 is a side view showing a first embodiment of the sign lamp according to the present invention.

FIG. 4 is a longitudinal sectional view along a plane including the central axis.

FIG. 5 is a front view showing the same reflector.

FIG. 6 is a longitudinal sectional view along a plane including the central axis.

FIG. 7 is a cross sectional view of the same.

In each figure, the same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

The reflector 3a of the sign lamp 3 is composed of an upper half reflecting surface 3a1 and a lower half reflecting surface 3a2 bordering the central axis XX '.

The upper half reflecting surface 3a1 is composed of a plurality of facets 3a5. Each facet 35 is composed of a free-form surface approximating a paraboloid of revolution. The free-form surface is emitted from the bulb 3b, and the light incident on the upper half reflecting surface 3a1 is substantially parallel to the central axis XX ′. It is set to be reflected to

On the other hand, the lower half reflecting surface 3a2 similarly comprises a plurality of facets 3a5. Each facet 3
Similarly, a5 is a free-form surface which is similar to a paraboloid of revolution, and the free-form surface is emitted from the bulb 3b, and the light incident on the lower half reflecting surface 3a2 is inclined with respect to the central axis XX '. Are set to be reflected in the direction of intersection.

Further, the upper and lower portions of the reflector 3a on the opening end side are cut so that the cut portions 3a3, 3a
4, when viewed from the front, has a horizontally long shape in which the top and bottom are parallel.

Further, when the reflector 3a is viewed from the lateral direction, the opening end thereof is oblique. This is because the opening end of the upper half reflecting surface 3a1 is closer to the top than the opening end of the lower half reflecting surface 3a2. This is because the opening end of the lower half reflecting surface is further obliquely retracted in accordance with it.

On the other hand, the electric bulb 3b has a cylindrical bulb 3b1 made of quartz glass and a filament 3b2 sealed inside the bulb 3b1. And light bulb 3
b is disposed such that the filament 3b2 is located 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.

More specifically, the valve 3b1 has a structure in which the base end is pinch-sealed and the tip end is tip-off.
A pair of metal foils 3b3 are embedded in the pinch seal portion 3b11 at a distance from each other, and a pair of leg portions 3b4, 3b4 'extend from the metal foil 3b3 into the bulb 3b1. A pair of base pins 3b5 protrude from the metal foil 3b3 to the outside of the bulb 3b1.

The leg portions 3b4 and 3b4 'extend from both ends of the filament 3b2 to supply electricity to 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. A coil is often used as a double coil or a single coil. Therefore, the leg 3b4 of the filament 3b2 on the distal end side of the bulb 3b1 extends substantially parallel to the filament 3b2. In the present embodiment, the leg 3b4 is formed by removing the upper part of the paraboloid of revolution of the reflector 3a. The portion 3a3 is opposed. However, if necessary, the leg part 3b4 is connected to the upper half reflecting surface 3b.
It may be arranged so as to be opposed to the joint between the a1 and the lower half reflecting surface 3a2.

The electric bulb 3b is constituted by a halogen electric bulb in which an appropriate amount of halogen such as iodine or bromine is sealed inside the bulb 3b1.

The base cement 3c is provided with a pinch seal 3b11 formed at the base end of the bulb 3b in the neck 3a6 of the reflector 3a and fixed to the neck 3a2, so that the bulb 3b cantileverly supports the reflector 3a. It is fixed in position.

FIG. 8 is a front view showing a second embodiment of the marker lamp according to the present invention.

In the figure, the same portions as those in FIGS. 3 to 7 are denoted by the same reference numerals, and description thereof will be omitted.

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 reflecting surface 3a1 and the lower half reflecting surface 3a2.

In this embodiment, the leg portions 3b4, 3b
b4 ′ is configured to face the joint of the facet 3a5.

The details are as follows. The upper half reflecting surface 3a1 and the lower half reflecting surface 3a2
By disposing a joint 3a6 extending in the vertical direction at the center, a pair of facets 3a divided into right and left is provided.
5 are formed. Also, a joint 3a7 extending in the lateral direction between the upper half reflecting surface 3a1 and the lower half reflecting surface 3a2.
Is formed.

Then, in the case shown, the leg portions 3b4, 3b
b4 'is opposed to the joint 3a6, so the leg 3
The shadows of b4 and 3b4 'mainly enter the joint 3a6,
The light does not substantially enter the curved surface portion that forms the reflection surface.
However, the legs 3b4, 3b4 'may be opposed to the joint 3a7.

As described above, since the legs 3b4 and 3b4 'may be directly opposed to any of the joints 3a6 and 3a7, the degree of freedom in assembly is increased.

FIG. 9 is a front view showing a third embodiment of the sign lamp according to the present invention.

In the figure, the same parts as those in FIG.

In this embodiment, as compared with FIG. 8, a joining portion 3a9 extending obliquely is further provided on the upper half reflecting surface 3a1 and the lower half reflecting surface 3a2.
The number of a5 is doubled. In addition, leg part 3b4,
3b4 'may be opposed to the joint 3a9.

FIG. 10 shows a fourth embodiment of the marker lamp of the present invention.
It is a front view which shows embodiment.

In the figure, the same parts as those in FIG.

The present embodiment is different in that a slight width is given to the joint 3a6 'for directly facing the legs 3b4, 3b4'.

That is, the joint 3a6 'is located between the adjacent facets 3a5 to form a diffuse reflection surface or a light shielding surface. Leg portions 3b4, 3 of filament 3b2
If b4 'is opposed to any part of the joint 3a6', there is no problem associated with the reflection of the shadows of the legs 3b4, 3b4 '.

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 small as possible.

FIG. 11 is a cross-sectional view taken along the line II-II ′ of FIG. 1 showing the optical action in one embodiment of the embedded marker lamp of the present invention.

In the figure, the same parts as those in FIG.

The light beam R1 emitted from the light bulb 3b toward the upper half reflecting surface 3a1 is reflected on the central axis X- of the reflector 3a.
The light is reflected almost parallel to X ′ and enters the color filter 4 and the prism 2 at right angles. This light ray R1 is refracted by the prism 2 and projected in a substantially horizontal direction.

On the other hand, the light ray R2 emitted from the bulb 3b toward the lower half reflecting surface 3a2 is reflected upward across the central axis XX ′ of the reflector 3a, and is reflected by the color filter 4 and the prism 2. Light enters at some angle. This ray R2 is refracted by the prism 2 and is projected slightly upward with respect to the horizontal line.

As described above, the light radiated from the electric bulb 3b is divided into two by the reflection on the upper half reflecting surface 3a1 and the lower half reflecting surface 3a2, and is angularly passed through the prism 2 respectively. Although they are slightly projected in different directions, they satisfy the required light distribution characteristics.

FIG. 12 is a light distribution characteristic diagram showing an example of a standard of the light distribution characteristic of the embedded marker lamp.

In the figure, the horizontal axis indicates the horizontal angle (degree), and the vertical axis indicates the vertical angle (degree).

A curve m indicates a main light beam curve, and a curve s indicates a 10% light beam curve.

This standard requires that the minimum average luminous intensity be 200 Cd and the minimum luminous intensity be 100 Cd within the angle range (horizontal angle ± 10 °, vertical angle 1-8 °) surrounded by the main light beam curve m. I have. The angle range (horizontal angle ± 16 °, vertical angle 0 to 13) surrounded by the 10% light column curve s
゜) requires the minimum luminous intensity to be 20 Cd.

According to the embedded marker lamp of the present invention, one example of the standard of the light distribution characteristic shown in FIG. 12 can be easily satisfied.

The base B will be described again with reference to FIG. 11 is an inner peripheral step, 12 is an upright wall, 13 is a central recess,
14 is a mounting hole. Although not shown, a power cable introduction hole is formed on the side surface of the base B.

The inner peripheral step 11 supports the periphery of the lamp body 1 for mounting the recessed marker light A slightly above the bottom surface of the lamp body 1.

The upright wall 12 surrounds and protects the side surface of the recessed marker light A. The base b is buried on the road surface G up to the upper end of the upright wall 12.

[0110] The central concave portion 13
It is stored liquid-tight through the ring 15 and
Is used to perform necessary electrical wiring (not shown) for the

FIG. 13 is a plan view of the lower lamp body in one embodiment of the recessed marker lamp of the present invention.

As shown in FIG. 2, the lower lamp 1b is formed in a dish-like shape having a flange 1b1 on the outer periphery, and a through hole 1b2 formed in the flange 1b1 extends the lower lamp 1b upward. It is for attaching to the lamp body 1a. Further, the through hole 1b3 connects the upper lamp 1a to the lower lamp and the base B.
It is for attaching to.

In this way, the space between the lower lamp body 1b and the base B is made liquid-tight by the O-ring 16.

FIG. 14 is a plan view of a base in an embodiment of the recessed marker light device of the present invention.

In the drawing, reference numeral 17 denotes a mounting hole for mounting the lower lamp body 1b. The other parts have already been described with reference to FIG.

[0116]

According to each of the first to fifth aspects of the present invention, the upper half reflecting surface configured so that the reflected light of the light radiated from the focal point does not cross the central axis, A lower half reflecting surface configured so that the reflected light intersects the central axis, and when light emitted from the filament of the light bulb is incident on the upper half reflecting surface, the light is reflected in a direction not intersecting with the central axis, and Light from the light bulb incident on the lower half reflecting surface is reflected in the direction crossing the central axis, so that the amount of protrusion of the lower half of the reflector can be reduced. In this case, it is possible to provide a sign lamp that can make the lamp thin.

According to the second aspect of the present invention, in addition, the upper half reflecting surface and the lower half reflecting surface of the reflector are constituted by a plurality of facets each having a free-form surface, so that the reflector has a desired light distribution characteristic. A sign lamp can be provided.

According to the third aspect of the present invention, in addition to the fact that the upper and lower portions on the opening end side of the reflector are cut, the height in the vertical direction can be reduced and the size in the horizontal direction can be reduced. By adjusting to the above, it is possible to provide a lamp for a sign lamp that satisfies the required light distribution characteristics of the recessed sign lamp by using a light bulb with the minimum power consumption by improving the appliance efficiency.

According to the fourth aspect of the present invention, in addition, since the opening end of the upper half reflecting surface of the reflector is retracted to the top side, the light reflected from the lower half reflecting surface is reflected by the upper half reflecting surface. It is possible to provide a sign lamp that is not kicked and easily obtains required light distribution characteristics.

According to the fifth aspect of the present invention, in addition, the leg portion of the filament of the electric lamp is opposed to the joint extending from the top to the open end between the adjacent curved surfaces. Since the shadow of the leg portion does not enter the curved surface of the reflecting surface, it is possible to provide a marker lamp having a small loss of effective light amount.

According to the invention of claim 6, it is possible to provide an embedded marker light having the effects of claims 1 to 5.

According to the seventh aspect of the present invention, the base can be buried in the road surface in advance, and the first to fifth aspects can be used.
It is possible to provide an embedded marker light device having the above-mentioned effect.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a recessed marker light device of the present invention.

FIG. 2 is a sectional view showing a section along the line II-II ′ of FIG. 1;

FIG. 3 is a side view showing a first embodiment of the sign lamp according to the present invention.

FIG. 4 is a longitudinal sectional view taken along a plane including a central axis.

FIG. 5 is a front view showing the same reflector.

FIG. 6 is a longitudinal sectional view along a plane including the central axis.

FIG. 7 is a transverse sectional view of the same.

FIG. 8 is a front view showing a second embodiment of the sign lamp according to the present invention.

FIG. 9 is a front view showing a third embodiment of the sign lamp according to the present invention.

FIG. 10 is a front view showing a fourth embodiment of the sign lamp according to the present invention.

FIG. 11 is a cross-sectional view taken along the line II-II ′ of FIG. 1 showing an optical action in one embodiment of the recessed marker light of the present invention.

FIG. 12 is a light distribution characteristic diagram showing a standard of the light distribution characteristic of the embedded marker light.

FIG. 13 is a plan view of a lower lamp body in the embodiment of the recessed marker light of the present invention.

FIG. 14 is a plan view of a base in the embodiment of the recessed marker light device of the present invention.

FIG. 15 is a cross-sectional view of an optical axis portion of the embedded marker light of the prior invention.

FIG. 16 is a sectional view of the same sign lamp.

[Explanation of symbols]

 A: Recessed sign lamp B: Base G: Road surface R1: Light ray R2: Light ray 1 ... Light body 1a ... Upper light body 1b ... Lower light body 1b1 ... Flange part 1c ... Internal space 1d ... Light extraction groove 1e ... Flat Part 1f: Inclined surface 1g ... Mounting hole 2 ... Prism 3 ... Indicator lamp 3a ... Reflector 3a1 ... Upper half reflecting surface 3a2 ... Lower half reflecting surface 3a5 ... Facet 3b ... Light bulb 4 ... Color filter 5 ... O-ring 11 ... Inner peripheral step part 12 ... Standing wall 13 ... Central concave part 14 ... Mounting hole 15 ... O-ring 16 ... O-ring

Claims (7)

[Claims] An electric bulb having a bulb and a filament sealed inside the bulb; and an upper half provided with the electric bulb, wherein the reflected light of light emitted from the electric bulb does not cross the central axis. And a reflector having a lower half reflecting surface configured such that reflected light of light emitted from the light bulb intersects with the central axis. 2. The sign lamp according to claim 1, wherein the reflector is constituted by a plurality of facets each having an upper half reflecting surface and a lower half reflecting surface each having a free-form surface. 3. The reflector according to claim 1, wherein at least upper and lower portions of the upper half reflecting surface and the lower half reflecting surface on the opening end side are cut substantially parallel to the central axis. Sign lamp. 4. The lamp according to claim 3, wherein the reflector has an opening end of the upper half reflecting surface receding to the top side. 5. The reflector includes a junction extending from a top side to an open end side between adjacent different curved portions; the bulb includes a pair of legs extending from both ends of the filament. The lamp for a sign lamp according to any one of claims 1 to 4, wherein the leg portion is disposed on the reflector such that the leg portion is located opposite to the joint portion of the reflector. 6. A lamp provided on the upper surface and having a light guide groove extending obliquely upward and an internal space communicating with the light guide groove;
An optical path regulating prism disposed in a liquid-tight manner between the light guiding groove and the internal space of the lamp; A lamp for a sign lamp according to any one of claims 1 to 5. 7. A recess embedded in a road surface, comprising: a recessed marker light according to claim 6; And a fixing means for detachably fixing the recessed marker light to the base.