JP2001155510A - Linear light source apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear light source apparatus which consists of plural LEDs to reduce error and variation in optical axis of the respective narrow- angle light distribution LED elements which with small projecting height from a road surface. SOLUTION: Over a circuit board 3 mounting plural LED chips 2 linearly, a reflecting surface 41 for guiding light emitted from the LED chips 2 in a direction nearly parallel to the board 3 face is formed and transparent resin material 5 for sealing the LED chips 2 is filled between the surface 41 and the board 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear light source device which is installed on a general road surface, a road surface of a tunnel, a wall surface, or the like, and specifies a route form, a route width, and the like of a traveling road.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, self-luminous road studs installed on a general road surface, a tunnel road surface, a wall surface, or the like have been used as a road form, a line width, and the like of a road on a road. And a line-shaped light source device A for guiding the line of sight of the driver of the vehicle. This line-shaped light source device A is called a line-of-sight guide light, and as shown in FIG. 8, an LED element B having a sealing structure formed by an integral lens is disposed on a circuit board C so as to be substantially horizontal to a road surface. , And the outer case D.

[0003]

However, when a plurality of integrated lens type LED elements B are used as in the above-mentioned conventional technique, a narrow angle light distribution type is generally used as the LED elements B. Therefore, due to an error such as an inclination when the LED elements B are mounted on the circuit board C, the directivity of each LED element B tends to vary in a predetermined direction. In addition, since the size of the lens of the LED element B is circular when viewed from the front, the height of the projection upward from the lower surface of the outer case D is the lens diameter, and the thickness of the linear light source device A is equal to that thickness. There is a problem that the outer case D protrudes from the road surface.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce errors and variations in the optical axis of each LED element having a plurality of LEDs and having a narrow angle light distribution. The object of the present invention is to provide a linear light source device having a low protruding height.

[0005]

In order to achieve the above object, a linear light source device according to the present invention comprises a plurality of LEs.
A reflection surface for guiding light emitted from the LED chip in a direction substantially parallel to the circuit board surface is provided above the circuit board on which the D chip is linearly mounted, and between the reflection surface and the circuit board. It is characterized by being filled with a transparent resin material for LED chip sealing. With this configuration, since the module is configured such that the reflection surface is mounted on the circuit board, it is possible to suppress a variation such as an installation error and a deviation of the optical axis.

[0006] It is preferable that the reflection surface is a plurality of parabolic curved surfaces whose focus is substantially on the mounting position of each of the LED chips. In this case, the light of the LED chip, which is almost a point light source, can be made substantially parallel by the parabolic curved surface, so that a narrow-angle light distribution can be realized. And height.

It is preferable that the parabolic curved surface is provided so that its optical axis faces upward at a predetermined angle from the circuit board. In this case, light can be distributed farther.

[0008]

1 to 6 show an embodiment corresponding to all of claims 1 to 3 of the present invention, and FIG.
1 is a side sectional view showing a linear light source device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a schematic configuration of the linear light source device. FIG. 3 is an explanatory view of one example of a parabolic curved surface of the linear light source device. FIG. 4 is an explanatory diagram of a parabolic curved surface of the linear light source device. FIG. 5 is an explanatory diagram of a use state of the linear light source device. FIG. 6 is a side sectional view showing another embodiment of the linear light source device.

The linear light source device 1 according to this embodiment has
Circuit board 3 on which a plurality of LED chips 2 are mounted linearly
A reflection surface 41 for guiding light emitted from the LED chip 2 in a direction substantially parallel to the surface of the circuit board 3, and sealing the LED chip 2 between the reflection surface 41 and the circuit board 3. Of the transparent resin material 5 described above.

Further, in the linear light source device 1 of the embodiment, the reflecting surface 41 is also a plurality of parabolic curved surfaces PA having substantially a focus on a mounting position of each of the LED chips 2.

More specifically, the linear light source device 1 includes an LED chip 2, which is a bare chip member serving as a light source, a circuit board 3, a reflection frame 4, a transparent resin material 5, and an outer case 6. .

In this case, four LED chips 2 are mounted by wire bonding on a mounting portion formed on a circuit board 3 formed of a glass epoxy base material or the like. The mounting portions of the LED chips 2 are connected in series or in parallel from input terminals provided on the circuit board 3 and are arranged in rows.
Is output along an optical axis formed in a predetermined direction through a reflecting surface 41 which is a parabolic curved surface PA formed by a reflecting frame 4 described later. That is, the circuit board 3 is provided with a positioning means so that the reflection frame 4 is fixed at a predetermined position corresponding to the mounting portion of the LED chip 2. By integrating the LED chip 2 with the circuit board 3, the LED chip 2 is easily positioned, and highly accurate optical axis alignment is realized.

In this case, as shown in FIG. 1, the reflection frame 4 is a reflection surface 4 formed by a parabolic curved surface PA whose optical axis is inclined.
As shown in FIG. 2, there are four of them, for example, after being formed of a synthetic resin material, the reflecting surface 41 is plated with a copper material, and the underlying surface is plated with nickel as a glossy reflecting surface. It is formed. The reflection frame 4 has, for example, a projection (not shown) serving as a portion to be positioned on the lower surface thereof. The projection is inserted into a through hole corresponding to the above-described positioning means and integrated with the circuit board 3. Be transformed into The LED chip 2 is mounted inside the parabolic curved surface PA of the reflection frame 4 on the mounting portion of the circuit board 3 at a substantially focal position, and then the epoxy resin or the like for sealing the LED chip 2 is used. Is filled with the transparent resin material 5 and the LED of the bare chip member is filled.
The chip 2 is sealed.

The outer case 6 is a die-cast member formed of a metal material such as a zinc alloy, for example, formed in a box shape having two open sides with open sides and a lower surface. This outer case 6
Is formed with strength not to be damaged by a pressing load caused by stepping on an automobile or the like, and is formed on the circuit board.
Is mechanically protected.

The inclination of the optical axis of the parabolic curved surface PA of the linear light source device 1 having the above configuration is an angle that can be visually recognized from a road surface position approximately 200 m ahead of the linear light source device 1, as shown in FIG. Is set to 0.43 degrees. Accordingly, the inclination of the parabolic curved surface PA serving as the reflecting surface 41 also becomes 0.43 degrees in the upward direction, and when the horizontal opening height H of the reflecting frame 4 is 6 mm as shown in FIG. Is 9.4 mm. This is, as shown in FIG.
Parabolic surface PA when the LED chip 2 is viewed from the front
Is set to 60 degrees.

Under the above conditions, as shown in FIG. 5, the light emitted from the LED chip 2 of the linear light source device 1 can be recognized as approximately parallel light from about 200 m in front of it. That is, when viewed from a distance, the light emitting area of the LED chip 2 as the light emitting unit is enlarged by the parabolic curved surface PA of the reflection surface 41, so that the visibility is improved. Also, since it is almost semicircular when viewed from the front,
The height is about half that of a conventional one using an LED element having a sealing structure with an integrated lens, and a thinner design is possible. Further, the light of the LED chip 2 which is almost close to the point light source can be converted into substantially parallel light by the parabolic curved surface PA, and a narrow-angle light distribution can be realized.

In order to efficiently use the light emitted from the LED chip 2, it is effective to increase the vertical opening angle of the parabolic curved surface PA when viewed from the front of the LED chip 2. That is, in the actual design,
Since there is a size of the LED chip 2 itself as a light source, it is necessary to determine in advance the opening height H of the reflection frame 4 that can be visually recognized in accordance with the application. Here, the size is set based on a 5 mm high reflective frame, which is about half the height of a large LED (diameter 10 mm) which is an integrated lens type LED element. Thus, it is possible to use about 80% or more of the light beam emitted from the LED chip 2 while making the light emitted from the LED chip 2 substantially parallel light.

In order to further improve the light emission efficiency, the opening height H of the reflection frame 4 may be increased, but in this case, the light distribution in the light emission direction is widened. Further, here, the module configuration using four LED chips 2 is used. However, in order to further increase the visibility from a certain direction, the number of LED chips 2 should be increased or the LED chips 2 in the emission direction should be increased. Can be dealt with by increasing the projection area and increasing the height H of the reflection frame 4.

Therefore, according to the linear light source device 1 described above, the module configuration in which the reflection surface 41 is mounted on the circuit board 3 can suppress mounting errors and variations in optical axis shift, etc. It is possible to reduce errors and variations in the optical axis of each LED element configured by a plurality of LEDs and having a narrow angle light distribution.

Then, the LED chip 2 which is almost a point light source
Can be converted into substantially parallel light by a parabolic curved surface, and a narrow angle light distribution can be realized.
The height is approximately half the height of the ED element, and the thickness can be reduced. Further, since the light can be distributed farther, the usability is improved.

It is to be noted that the linear light source device of the present invention may be arranged such that the optical axis of the parabolic curved surface PA is substantially parallel to the circuit board 3 as shown in FIG. Including those provided in various embodiments, such as those provided.

[0022]

The present invention is embodied as in the above-described embodiment. In the linear light source device according to the first aspect of the present invention, the module configuration in which the reflection surface is mounted on the circuit board causes an error in mounting. Since variations such as deviation of the optical axis can be suppressed, errors and variations in the optical axis of each LED element formed of a plurality of LEDs and having a narrow angle light distribution can be reduced.

Further, in the linear light source device according to the second aspect, the light of the LED chip which is almost a point light source can be made substantially parallel by the parabolic curved surface, so that a narrow angle light distribution can be realized. In addition, the height is approximately half of that of the LED element having the sealing structure formed by the integral lens, so that the thickness can be reduced.

Further, in the linear light source device according to the third aspect, the light can be distributed farther, so that the usability is improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a linear light source device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a schematic configuration of the linear light source device.

FIG. 3 is an explanatory view of one embodiment of a parabolic curved surface of the linear light source device.

FIG. 4 is an explanatory diagram of a parabolic curved surface of the linear light source device.

FIG. 5 is an explanatory diagram of a use state of the linear light source device.

FIG. 6 is a side sectional view showing another embodiment of the linear light source device.

FIG. 7 is a schematic configuration diagram showing a linear light source device as a conventional example of the present invention.

FIG. 8 is an explanatory diagram of the linear light source device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Linear light source device 2 LED chip 3 Circuit board 41 Reflective surface 5 Transparent resin material PA Parabolic curved surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadafumi Murakami 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. 72) Inventor Masaki Ishiwatari 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Works, Ltd. (reference) 3K080 AA12 AB01 AB15 BA07 BC01 BE07

Claims (3)

[Claims] An LED is mounted on a circuit board on which a plurality of LED chips are linearly mounted, in a direction substantially parallel to the surface of the circuit board.
A linear light source device comprising a reflection surface for guiding light emitted from an ED chip, and a transparent resin material for sealing an LED chip filled between the reflection surface and the circuit board. 2. The linear light source device according to claim 1, wherein the reflecting surface is a plurality of parabolic curved surfaces having substantially a focus on a mounting position of each of the LED chips. 3. The linear light source device according to claim 2, wherein the parabolic curved surface is provided so that an optical axis thereof is directed upward by a predetermined angle from the circuit board.