JP2001228400A - Lamp device for optical communication and optical communication system by this lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp device for optical communication which prevents the leakage of light in a perpendicular direction arising at both ends in a horizontal direction and makes it possible to obtain a light distribution pattern of a wide range where the deficiency of the light quantity in a central part is compensated and an optical communication system by this lamp device. SOLUTION: This lamp device has a first mirror 1 of a trough shape which has a paraboloid on a concave surface, second mirrors 2 which are respectively arranged to incline at both ends of the first mirror 1 and have paraboloids on a pair of concave surfaces disposed to open the concave surface of the first mirror 1, two light emitting elements which are arranged at a lead frame so as to respectively face the trough type second mirrors 2 and a small plane mirror 8 which is disposed at the lead frame so as to reflect the light toward the mirror device. More preferably this lamp device for optical communication which is arranged at the center of the first mirror 1 and has a third mirror 3 of a trough type having the paraboloid on the convex surface so as to part the concave surface of the first mirror 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp device for optical communication having a parabolic trough-type mirror, and more particularly to an optical signal for optical communication with a receiving device for optical communication arranged in a straight line. The present invention relates to a lamp device for emitting light and an optical communication system using the lamp device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, for example, an indoor local area network (LA) is used.
N), at the Langage Laboratory (LL) learning facilities, play facilities such as pachinko, and cash registers at supermarkets, etc.
Telecommunication receiving / transmitting device 1 arranged on a straight line of several meters on the left and right
When exchanging data between the transmission / reception device 110 and the transmission / reception device 110, 112, 113, and 114, the exclusive wiring 121 and 122 are used.

However, the transmitting / receiving devices 111, 1
When rearranging 12, 113, and 114 and installing new receiving / transmitting devices 115, 116, and 117, the ceiling 1
Wiring work on the floor 31, the wall 132, the floor 133, and the like must be performed at the same time, which requires much cost and time. In addition, since a complicated wiring operation has to be performed for a plurality of transmission / reception devices, much labor has been required.

On the other hand, when optical communication using infrared light is used,
As shown in FIG. 11, since the data can be sent to the space, the dedicated wirings 121 and 122 are not required.
As the conventional transmission / reception device 110 for optical communication, a plurality of lamps 511 having light emitting elements 4 as shown in FIG. Lamp device 611 arranged in combination
Was used. However, in this case, as shown in FIG. 14 showing the light distribution pattern, the light distribution pattern
However, there is a problem that even if the horizontal direction can be widened, unnecessary light spreading in the vertical direction 811 cannot be suppressed, and power is wasted.

For this reason, the present inventor has previously described a trough-shaped main mirror 81 having a concave reflecting surface as shown in FIG.
And a flat mirror 82 which is arranged at both ends of the main mirror 81 at an angle so as to open the concave surface of the main mirror 81, and the flat mirror 82 , A deep dish-shaped small mirror 8 provided to reflect light from the light emitting element 4
3 has been proposed (Japanese Patent Laid-Open No. 10-70511). In addition, in the figure, the light emitting element 4 is shown with a part of the pier 10 provided for mounting. Reference numeral 6 denotes a square ring-shaped lead frame, and reference numeral 11 denotes a window for extracting light.

The light distribution diagram of FIG. 18 shows the effect of the above-mentioned conventional invention.
It is a figure which shows the light distribution in 10 m and area | region 42 of ± 10 m of a vertical direction. The light distribution measurement is performed at intervals of 20 cm, and includes a total of 10,000 measurement points. The area (black portion) 40 where there is sufficient light and communication is possible is ± 7 m in the horizontal direction and ± 0.25 m in the vertical direction. That is, with this lamp device, light could be emitted within a range of about 7 m each on the left and right on a straight line 4 m ahead of the light source.

[0007]

However, when looking at the light distribution outside the range of ± 7 m in the horizontal direction in the above light distribution diagram, the area where communication is unstable due to insufficient light quantity (shaded area) Reference numeral 41 extends in the vertical direction ± 2 m. When the light distribution is examined in detail, the cause of the spread of the unstable area 41 is a part 84 of the light reflected by the plane mirror 82 (FIG. 15).
Is caused by the light projected from the small mirror 83 to the side portion of the plane mirror 82, which causes noise. In other words, in the conventional invention having the trough-shaped main mirror, useless light leaks and spreads in the vertical direction,
There is a problem that light can be emitted only up to ± 7 m in the horizontal direction 4 m ahead. Further, in this conventional invention, the light-emitting element 4 is mounted in a small dish-shaped small mirror 83 engraved on the pier 10 of the lead frame 6 so as to suppress scattering of light in the vertical direction in the lamp device. Therefore, there was also a problem that the production was troublesome.

In order to realize a light pattern in the horizontal direction over a wide range and to emit light to a distant distance, a combination of a plurality of lamps has been conventionally seen as described above. Even so, a plurality of lamp devices having the trough-shaped main mirror must be used,
There was a problem that the assembling was troublesome, the system became large, and the cost was high. That is, at present, there is a problem that it is not possible to directly cope with a new demand in the market that it is desired to communicate over a wider range of about 10 m each on the left and right on a straight line 4 m ahead.

In view of the above situation, an object of the present invention is to prevent light leakage in a vertical direction occurring at both ends of a light distribution pattern in a horizontal direction in a single optical communication lamp device. The present invention provides a lamp device capable of performing optical communication in a wide range expanded in the horizontal direction such as 10 m on each side at a distance of 4 m, and further, eliminating a light quantity shortage portion in such a wide horizontal range, and It is an object of the present invention to provide a highly economical optical communication system using the lamp device.

[0010]

Means for Solving the Problems The inventor of the present invention has made intensive studies to solve the above-mentioned problems. As a result, in the conventional lamp device shown in FIG. 15, when the angle of the plane mirror is changed, the reflected light becomes wide. Spreads, but the intensity of the light at the center is weak, and it is not possible to obtain a uniform light intensity on a straight line, and there is a limit to spreading the light further horizontally to obtain continuous linear light I understand. Therefore,
The present invention has been found that by changing the mirror shape, adding a new auxiliary mirror, and combining these, it is possible to further widen the linear light beam.

That is, the present invention firstly provides a trough-shaped first mirror having at least a parabolic surface on a concave surface, and the first mirror which is disposed at both ends in the longitudinal direction of the first mirror so as to be inclined. A trough-shaped second mirror having a paraboloid on a concave surface provided in a pair so as to open the concave surface of the light-emitting device, and two light-emitting devices for optical communication disposed opposite to the trough-shaped second mirror, respectively. An optical communication lamp device comprising a lamp device including an element, and a small flat mirror provided at each position of the light emitting element and provided to reflect light on each of the trough-shaped mirrors. Yes, second,
A first trough-shaped third mirror having a parabolic surface on a convex surface which is disposed at the center of the first mirror and is provided so as to divide the concave surface of the first mirror; Thirdly, the present invention provides a lamp device for optical communication according to the present invention, wherein at least a concave surface has a parabolic surface, and the focal length A of the parabolic surface is 2.1 ± 0.1 mm; A trough-shaped first mirror having an aspect ratio of the trough in the range of 1: 1.3 to 1: 15.7, and a distance B from a center axis 1C that divides the trough-shaped first mirror into left and right are 6. 74 ± 0.1
mm and the height C from the inner bottom of the first mirror is 0.0 ±
A focal length is set such that the center is located at a position of 0.1 mm, and the angle D with respect to the inner bottom of the first mirror is 80 ± 1 degrees to open the concave surface of the first mirror. A trough-shaped second mirror having a concave paraboloid with E of 0.75 ± 0.05 mm, and a distance H from a center axis 1C dividing the first mirror into left and right is 6.3.
Two light-emitting elements for optical communication, each being arranged so that the active layer is located at a height A from the inner bottom of the first mirror at 5 ± 0.1 mm, and at the positions of the light-emitting elements, respectively. A lamp device having a small flat mirror disposed to reflect light to the trough mirror, the lamp device being provided with an optical communication device. The first mirror at the center of the first mirror
At a position where the height F from the inner bottom of the mirror is 1.0 ± 0.1 mm, the center is arranged so as to divide the concave surface of the first mirror, and the focal length G is 1.0 ± 0.1 mm. The lamp device for optical communication according to the third item, further comprising a trough-shaped third mirror having a parabolic surface having a convex surface, and the lamp device according to the fifth aspect, further includes a concave surface. A long width J is 13.4 ± 1 mm and a short width K is 8.8 ± 0, which is disposed at a rectangular ring-shaped opening edge formed by the first mirror having the first mirror and the pair of second mirrors having a concave surface. It has an elliptical opening of 0.5 mm and a thickness I of 0.1 to 5
The lamp device for optical communication according to the third or fourth aspect, further comprising a lead frame having a length of 0.1 mm, and sixthly, the lamp device is provided with the focal length A, the distance B, the height C, The lamp device according to any one of claims 3 to 5, wherein each of the dimensions of the focal length E and the distance H is a similar-shaped lamp device having a dimension enlarged or reduced at a fixed ratio as a dimension of each corresponding portion. Seventh, an optical communication lamp device,
The lamp device according to any one of claims 3 to 6, wherein the lamp device is a similar lamp device having, as dimensions of corresponding parts, dimensions in which each dimension of the height F and the focal length G is enlarged or reduced at a fixed ratio. Eighth, the lamp device for optical communication according to any one of the above, further, in the lamp device, each dimension of the long width J, the short width K, and the thickness I is enlarged or reduced at a fixed ratio. The lamp device for optical communication according to any one of the third to seventh embodiments, which is a lamp device including a lead frame having a similar shape having dimensions corresponding to the corresponding portions, and ninth to the first An optical communication system using the optical communication lamp device according to any one of claims 1 to 8.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A lamp device for optical communication according to the present invention
As shown in FIG. 1 showing the first embodiment (hereinafter, substantially the same members or the same equivalent members will be described using the same reference numerals including the case of the prior art), a trough shape with a concave surface forming a paraboloid surface And a pair of inclined parabolic concave trough-shaped second mirrors 2 are combined at both ends of the first mirror 1 to form an integral mirror device. Are supported by a lead frame 6, small flat mirrors 8 are provided on the back surfaces of both ends of the first mirror 1 in the longitudinal direction of the lead frame 6, and the LED light emitting elements 4 are arranged at the center of the flat mirror 8. It is.

The LED light emitting element 4 is disposed such that its active layer (light emitting layer) as a light source is located at the focal position of the first mirror 1 and the second mirror 2, and the light from this active layer is Are reflected parallel to the first mirror 1 and projected in the horizontal direction without being scattered in the vertical direction, and are also reflected in the second mirror 2 and spread in the horizontal direction without being scattered in the vertical direction. By being projected, it is possible to prevent light from leaking in the vertical direction particularly occurring at both ends in the horizontal direction, and to obtain a light distribution pattern in a wide range in the horizontal direction.

Further, the lamp unit 30 for optical communication according to the present invention.
Preferably, as shown in FIG. 7 showing the second embodiment, the trough-shaped first mirror 1 and the second mirror 2 in the case of the first embodiment
In addition, a third mirror 3 formed as a parabolic convex surface is provided at the center of the first mirror 1. The third mirror 3 is arranged so as to divide the first mirror 1 in the longitudinal direction, and projects reflected light from the second mirrors 2 at both ends to the center in the horizontal direction, thereby forming a light distribution pattern. Insufficient light quantity at the center can be compensated.

In a lamp device for optical communication having a parabolic trough mirror, light emitted from a light emitting element can be roughly divided into two ways. The light emitted from the light emitting element 4 includes first paths 71 and 74 which are reflected by the first mirror 1 and jump out to the outside, as shown in FIG. 3 showing a schematic front sectional view of the lamp device of FIG. There is a second path 72 that reflects off the second mirror 2 and jumps out. First, the first
In order to suppress the spread of light in the vertical direction in the path, the light emitting element 4 such as an LED is formed into a trough with a concave surface as shown in FIG. The light is turned into a parallel light beam by being placed at the focal position of the first mirror.

Next, in order to suppress the spread of the light in the vertical direction in the second path of the light passing through the reflection of the second mirror provided for spreading the light in the horizontal direction, aa of FIG.
As shown in FIG. 2 showing a cross section along the line, a light emitting element 4 such as an LED is placed at a focal length A of a trough-shaped first mirror 1 and a second mirror 2 whose concave surface has a parabolic trough shape.
At the focal position E, the light becomes a light beam parallel to the horizontal direction.

Further, a trough-shaped third mirror 3 having a parabolic convex surface is provided at the center of the first mirror 1 as shown in FIG. By arranging, it is possible to adjust the direction of the light reflected by the first mirror 1 and make up for the insufficient light quantity at the center of the light distribution pattern.

More specifically, as shown in FIG. 2 showing a cross section taken along the line aa of the lamp device of FIG. 1, a concave surface having a focal length A of 2.1 ± 0.1 mm is a parabolic surface. ,
At both ends in the longitudinal direction of the slightly long trough-shaped first mirror 1,
The center is disposed at a symmetrical position where the distance B from the center axis 1C dividing the first mirror into left and right is 6.74 ± 0.1 mm, and the angle D with respect to the inner bottom of the first mirror 1 is set. , 80 ± 1 degree, focal length E
The trough-shaped second mirrors 2 each having a paraboloidal concave surface having a diameter of 0.75 ± 0.05 mm are arranged. The trough aspect ratio of the trough-shaped first mirror is 1: 1.3 to 1:15.
7 can be appropriately selected. When the aspect ratio is shorter than 1: 1.3, the light becomes weaker at a position near ± 5.5 m in the horizontal direction. On the other hand, when the aspect ratio is longer than 1: 15.7, the light becomes weaker near the center. Either case is not preferred.

Further, when the trough-shaped third mirror 3 is provided, the focal length G is 1.0 ± 0.1 mm as shown in FIG. 8 which shows a cross-sectional view along the line aa of the lamp device of FIG. A trough-shaped third mirror 3 having a parabolic convex surface is placed on a central axis 1C of the first mirror 1 and a height F from the inner bottom of the first mirror 1 (in this case, the same as the focal length G). ) Is 1.0 ±
It is arranged at a position of 0.1 mm.

Further, in order to guide light from a light emitting element 4 such as an LED to the above-described first mirror 1, second mirror 2 and third mirror 3, as shown in FIGS. A small flat mirror 8 is provided in a portion facing the second mirror 2. That is, the left-right distance H from the central axis 1C of the parabolic trough-shaped first mirror 1 is 6.35 ±.
A small flat mirror 8 is placed at a position where the height M is 0.1 mm and the height M from the inner bottom of the first mirror 1 is 2.2 ± 0.05 mm.

Further, as shown in FIG. 5 showing a partial side sectional view of the lamp device of FIG. 1, the height L of the active layer 20 is 0.1 ± 0.1.
A light emitting element 4 such as an LED having a size of 0.03 mm is bonded to the central portion 1B of the small flat mirror 8. According to the above method, the lamp device 30 in which the active layer 20 of the light emitting element 4 is installed at the focal length A of the trough-shaped first mirror 1 and the focal length E of the trough-shaped second mirror 2 can be manufactured.

In addition, in the lamp device shown in FIGS. 1 and 7, the lead frame 6 is provided in a rear perspective view of the lead frame shown in FIG. 6 so that the light reflected by each mirror can be emitted to the external space without being blocked. As shown, a substantially square ring having a large elliptical opening 5 is used.
The lead frame 6 has a long width J of 13.4 ± 1 mm and a short width K of 8.8 ± 0.5 mm in the elliptical opening 5.
And the thickness I is 0.1 to 5 mm, preferably 0.5 to 5 mm.
3 mm.

The reason why it is preferable to select the thickness I of the lead frame as described above is as follows. (1) When the thickness of the lead frame exceeds 5 mm, light hits the side surface of the lead frame, and particularly, the spread of light in the horizontal direction is blocked. (2) When the thickness of the lead frame is less than 0.1 mm, the cross-sectional area of the lead frame becomes small, so that the heat generated by the chip during operation cannot be transmitted to the outside quickly. Further, the weight of the mirror device cannot be supported, and the mirror device is bent, so that the lamp cannot be mounted. In addition, it is expected that the root of the lead frame is broken due to long-time use. (3) light shielding properties, thermal conductivity,
Considering the mechanical strength, the thickness of the lead frame is set to 0.
A range from 5 mm to 3 mm is a preferable range.

The configuration of the lamp device according to the present invention having the above-described configuration includes the focal length A of the first mirror 1 and the second mirror 2.
The distance B and the height C indicating the position of the mirror 2, the focal length E of the second mirror 2, and the distance H indicating the position of the light emitting element 4 are enlarged or reduced at a fixed ratio. The present invention is also applied to an apparatus, and provides the same operation and effect. Also, in the lamp device of the present invention including the third mirror 3, a similar shape in which each dimension of the focal length G and the height F indicating the arrangement position of the third mirror 3 is enlarged or reduced at a fixed ratio. The same operation and effect can be obtained. Further, the lamp device of the present invention including the lead frame has the openings of the long width J and the short width K, and each dimension of the lead frame having the thickness I is enlarged or reduced at a fixed ratio. The present invention is also applied to a lamp device having a similar lead frame, and provides the same function and effect.

[0025]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a lamp device for optical communication according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along the line aa in FIG. 1. In FIG. 1, a lamp device 30 obliquely closes both longitudinal ends of a trough-shaped first mirror 1 having a paraboloid on a concave surface with a trough-shaped second mirror 2 having a paraboloid on a concave surface. A rectangular ring-shaped full opening edge formed by a mirror is supported so as to be framed by a thick lead frame 6 having a large oval opening 5, and a flat window 11 made of a transparent plate is further supported. It has been reinforced with.

An overhang or pier 10 is provided on the portion of the lead frame 6 facing the trough-shaped second mirror 2, and a small flat mirror 8 is provided on the back (mirror side) of the pier 10.
The LED light-emitting element 4 as a light source is arranged at the center of the small plane mirror 8 toward the second mirror 2, and the wiring 9 is arranged between the adjacent piers 10.

The mounting position of the LED light emitting element 4 as a light source will be further described with reference to the sectional view of FIG. First,
Utilizing the fact that when a non-directional light source is placed at the focal length of a parabolic mirror, the light reflected from the mirror travels in parallel,
In order to suppress the spread of light in the vertical direction, the LED light-emitting element 4 is mounted so that the active layer (light-emitting layer) is positioned at the focal length A of the trough-shaped first mirror 1 having a parabolic surface on the concave surface. That is, the light emitting element 4 located at the focal length A
Out of the light emitted from the first mirror 1 as shown in FIG.
The light of the first paths 71 and 74 which are reflected to
Since the light beams are parallel as shown in FIG. 4, scattering is suppressed.

To further explain, even at a distance more than ± 7 m in the horizontal direction at a distance of 4 m from the light source, as shown in FIG. 2, a trough-shaped first mirror 1 having a paraboloid is used to suppress the spread of light in the vertical direction. From the central axis 1C of
The LED light emitting elements 4 are arranged in a pair at a distance H to both ends, and a trough-shaped trough having a parabolic surface is located at a distance B from the central axis 1C and a height C from the inner bottom of the first mirror. The second mirrors 2 are arranged at an angle D so as to be located at the center of the second mirror 2. As a result, the light of the second path 72 that is reflected by the second mirror 2 and jumps out as shown in FIG. 3 becomes a parallel light beam that spreads in the horizontal direction, thereby suppressing scattering.

In order to irradiate a large amount of light to these trough mirrors, a pair of small flat mirrors 8 are provided at positions facing both ends of the second mirror 2 of the lead frame 6, respectively. That is, as shown in FIGS. 2 and 5,
It is arranged at each of the left and right distances H of the height M obtained by adding the height L of the active layer 20 of the LED light emitting element 4 to the position of the focal length A of the trough-shaped first mirror 1. The small flat mirror 8 is formed by polishing a part of the lead frame 6 or crushing it with a polished punch. The LED light emitting element 4 is bonded to the center 1B of the small plane mirror 8, and the wiring 9 is provided so as to be able to conduct electricity.

As shown also in the rear view of FIG. 6, the lead frame 6 has a thickness of I, and blocks light from the first and second trough-shaped mirrors 1 and 2 having a parabolic surface. An elliptical opening 5 having a long width J and a short width K is provided so as not to be present. At both ends of the opening 5, LED light emitting elements 4 are attached,
Although a small pier 10 for the wiring 9 is made, the light distribution pattern is not disturbed because both the length and the width are about 0.6 mm.

Further, the elliptical opening 5 is provided in FIGS.
As shown in FIG. 1, a transparent flat window 1 having a thickness T of 1 mm
Attach 1. Since the window sandwiches the lead frame 6 between the mirror device and the flat window 11, the lead frame 6 reinforces the structure supporting the mirror device. This flat window 11
There is no effect on the light distribution pattern due to the attachment of the.

The first embodiment of the present invention will be described more specifically. First, the lead frame 6 has a thickness of 1.0 m.
m, width 17mm, width 15mm using a copper plate, width 1
The two leads 7 mm were formed so as to protrude 5 mm in length. Further, the lead frame 6 has a width J of 1
An elliptical opening 5 having a length of 3.4 mm and a short width K of 8.8 mm is provided. At both ends of the opening 5 in the width direction, the tip has a diameter for mounting the LED light emitting element 4 and installing the wiring 9. 0.6m
m small piers 10 were respectively protruded at a 2.0 mm center interval. The distance between the piers 10 may be any distance as long as the wiring 9 can be provided.
Is set on the central axis in the long width J direction of the lead frame 6.

Further, at a pier 10 protruding at both ends of the lead frame 6 for mounting the LED light emitting element 4, the center axis of the lead frame 6, that is, the first mirror 1 (aspect ratio of trough of 1: 1.65). Polishing at the left and right positions where the distance H from the center axis 1C is 6.35 mm,
A circular flat mirror 8 having a diameter of 0.6 mm was formed. Therefore, as shown in FIG. 6, the lead frame 6 is composed of three parts. The first part 12 is a small flat mirror 8 for mounting the first LED light-emitting element.
Is a portion including the pier 10 and the lead 7 formed with
The portion 13 is a portion including a pier 10 for applying the wiring 9 to the first LED light emitting element 4 and a pier 10 on which a small plane mirror 8 for attaching the second LED light emitting element 4 is formed. The portion 14 includes a pier 10 for applying the wiring 9 to the second LED light emitting element 4 and a portion including the lead 7. Further, two notches 15 corresponding to a hole having a diameter of 2.3 mm were provided so that they could be easily fixed to various devices with screws.

For the purpose of reflecting light, the lead frame 6 was used by applying nickel plating with a base thickness of 1 μm and silver plating with a thickness of 2 μm on the entire surface.
The LED element 4 has an emission wavelength of 880 nm, a response frequency of 12 MHz, and an optical output of 4 mw at DC 20 mA.
Two infrared light emitting diodes were used. The dimensions of the LED light-emitting element 4 are not shown, but each side is a square having a length of 370 μm, a height of 160 μm, and a gold electrode having a diameter of 140 μm on the upper part of the LED light-emitting element 4.
The wiring 9 is provided by m gold wires.

The height L of the active layer 20, which is the light emitting position of the LED light emitting element 4, is 0.1 mm from the bottom surface of the LED light emitting element 4. Each dimension shown in FIG.
2.1 ± 0.1 mm, B = 6.74 ± 0.1 mm, C =
0.0 ± 0.1 mm, D = 80 ± 1 degree, E = 0.75 ±
The lamp device 30 shown in FIG. 1 was manufactured so that 0.05 mm and H = 6.35 ± 0.1 mm.

The procedure for manufacturing the lamp device having the above-described structure was as follows. A concave mold (not shown) having a shape similar to the first mirror 1 and having predetermined positions at both ends of the parabolic trough cut at predetermined angles by a parabolic trough similar to the second mirror 2. And a concave frame (not shown) for forming the flat window 11, the lead frame 6 having the LED light emitting element 4 attached thereto, so that the LED light emitting element 4 faces the trough mirror 2. , And a transparent epoxy resin was injected from a gate opened in a part of the mold, cured at a predetermined temperature and time, and then taken out of the mold. The first and second mirrors were formed by a method of depositing silver on a resin portion taken out of the mold. further,
Acrylic resin was coated by spraying so that these mirror surfaces were not damaged. When depositing silver, a mask was applied to a distance of 0.1 mm from the lead frame 6 so as to prevent an electrical short circuit between the lead frame 6 and the mirror interface, and a portion where silver was not deposited was provided. .

When the light distribution pattern of the manufactured lamp device 30 of FIG. 1 was measured, a light distribution diagram shown in FIG. 16 was obtained. FIG. 16 shows a light distribution in a region 42 of ± 10 m in the horizontal direction and ± 10 m in the vertical direction 4 m ahead of the lamp device. The light quantity deficient regions (shaded portions) 41 are roughly distributed at both ends of the light distribution pattern.
The area (black portion) 40 where there is a sufficient amount of light and communication is possible ranges ± 10 m in the horizontal direction and ± 0.25 m in the vertical direction. However, the horizontal direction in front of the lamp device =
Looking at the light distribution near 0m, 0m vertically, ± 4m
The light is slightly weaker than. Therefore, in the lamp device of the first embodiment, almost communication is possible within a range of ± 10 m in the horizontal direction. However, depending on the usage conditions, such as not installing a light receiving device in front of the transmitting device or installing a highly sensitive light receiving device. Care should be taken.

[0038]

Embodiment 2 Hereinafter, Embodiment 2 of the present invention will be described with reference to the accompanying drawings. FIG. 7 is a perspective view showing a lamp device for optical communication according to a second embodiment of the present invention.
FIG. 8 is a sectional view taken along the line aa in FIG. 7. In FIG. 7, the lamp device 30 has a parabolic surface with a convex surface so as to divide the concave surface of the first mirror 1 at the center of the first mirror 1 in addition to the first mirror 1 and the second mirror 2 of the first embodiment. And a trough-shaped third mirror 3 is provided.

As shown in FIG. 3, the third mirror 3 is a path through which light from the light emitting element 4 having no such third mirror is reflected outside the center 1C of the first mirror 1 and jumps out. It acts to block 74. Accordingly, by placing the trough-shaped third mirror 3 having a parabolic convex surface on the first mirror 1 at a predetermined height at the central portion 1C of the first mirror 1 as shown in the schematic horizontal sectional view of FIG. The direction of a part of the light incident on the first mirror 1 can be adjusted so as to take the third path 73 to compensate for the insufficient light quantity at the center of the light distribution pattern. As described later, it is desirable that the focal length G of the third mirror 3 is 1.0 ± 0.1 mm and the installation height F is 1.0 ± 0.1 mm from the inner bottom of the first mirror 1.

The mounting position of the light emitting element 4 will be described in more detail with reference to FIG. First, the light emitting element 4 of the LED, which is a light source, is attached so that the active layer 20 is located at the focal length A of the trough-shaped first mirror having a parabolic surface on the concave surface. Furthermore, ± 10 in the horizontal direction at a distance of 4 m from the light source
m, the LED light-emitting element 4 is arranged at a distance H from each end from the center axis 1C of the trough-shaped first mirror 1 having a parabolic surface, and a position immediately below the LED, that is, The mirror 2 is tilted at an angle D so that the center of the trough-shaped second mirror 2 having a paraboloid is located at a distance B from the central axis 1C and a height C from the inner bottom of the first mirror. Are arranged respectively. Further, in order to compensate for the lack of light amount in front of the lamp device by adjusting the direction in which light travels, a third trough mirror 3 having a parabolic surface on the convex surface is used.
The first mirror 1 is placed at the height F of the central portion 1C.

In order to irradiate the trough-type mirror with a large amount of light, as shown in FIG. At the height M and the left and right distance H. The small flat mirror 8 is formed by grinding or crushing a part of the lead frame 6 with a polished punch. Further, the LED light emitting element 4 is bonded to the central portion 1B of the small flat mirror 8, and the wiring 9 is provided so that electricity can be supplied.

Each dimension shown in FIG. 8, A = 2.1 ± 0.1
mm, B = 6.74 ± 0.1 mm, C = 0.0 ± 0.1
mm, D = 80 ± 1 degree, E = 0.75 ± 0.05 mm,
F = 1.0 ± 0.1 mm, G = 1.0 ± 0.1 mm, H
= 6.35 ± 0.1 mm to produce the lamp device 30 shown in FIG.

The procedure for manufacturing the lamp device 30 is as follows. Lead frame 6, LED light emitting element 4
The same one as in Example 1 was used. A predetermined position at both ends of the parabolic trough similar to the first mirror 1 is cut at a predetermined angle by a parabolic trough similar to the second mirror 2, and a predetermined position at the center of the first mirror is set to a third position. A concave mold (not shown) cut out with a parabolic trough similar to mirror 3;
A concave mold (not shown) for forming a flat window 11
, The lead frame 6 having the LED light emitting element 4 attached thereto is sandwiched so that the LED light emitting element 4 faces the trough mirror 2, and a transparent epoxy resin is injected from a gate opened in a part of the mold. Then, after curing at a predetermined temperature and time, these were taken out of the mold. The first, second, and third mirrors were formed by a method of depositing silver on a resin portion taken out of the mold. Further, an acrylic resin was coated by spraying so that these mirror surfaces were not damaged. When depositing silver,
0.1 m distance from lead frame 6 to prevent electrical short circuit between lead frame 6 and mirror interface
A mask was applied to a distance of m to provide a portion where silver was not deposited.

When the light distribution pattern was measured, FIG.
The light distribution shown in FIG. 7 was obtained. FIG. 17 shows a horizontal direction ± 10 m and a vertical direction ± 4 m 4 m away from the lamp device.
The light distribution in the area 42 of 10 m is shown. Insufficient light quantity regions (hatched portions) 4 at both ends of the light distribution pattern
1 is reduced, and the area (black portion) 40 where the amount of light is sufficient and communication is possible is ± 10 m in the horizontal direction and ± 0.0 m in the vertical direction.
The communication range extends over a range of 25 m, and is almost uniformly distributed on a straight line of ± 10 m in the horizontal direction including near the horizontal direction = 0 m and the vertical direction = 0 m in front of the lamp device.

As described above, in the conventional case, a plurality of lamps are used in combination. However, according to the present invention, one lamp device 30 can be used at a distance of about 10 m on each of the left and right sides 4 m ahead.
m could be emitted over a wide range of horizontal light.

In the present invention, the shape of the second mirror is changed from the conventional flat mirror 82 to the trough-shaped second mirror 2,
Since the light emitting element 4 is positioned near the focal length of the inclined trough mirror 2, light emitted from any angle of the light emitting element becomes almost parallel light, and noise light spreading outside can be reduced. Therefore, it is not necessary to form a deep dish-shaped small mirror 83 on the lead frame 6, and it is only necessary to process the small flat mirror 8, which facilitates manufacture.

[0047]

As described above, according to the present invention, the reflection mirror and the lead frame are formed in a predetermined shape, size,
By combining the position and the angle, even with one lamp device, it is possible to obtain a great effect that a straight line can be transmitted for a horizontal distance of about 10 m on each of the left and right sides of 4 m ahead. Further, the lamp device according to the present invention can provide a useful light distribution pattern and light output without combining a plurality of lamps, and thus has a great effect that a compact device can be obtained. Further, by using the above-described lamp device of the present invention and arranging the lamp device in a conventional manner, the left and right sides of the front of the vehicle are about 10 m each.
There is an effect that a compact and economical optical communication system capable of performing optical communication with respect to the horizontal distance is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lamp device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is a schematic front sectional view of the lamp device of FIG. 1;

FIG. 4 is a schematic side sectional view of the lamp device of FIG. 1;

FIG. 5 is a partial side sectional view of the lamp device of FIG. 1;

FIG. 6 is a rear perspective view of a lead frame in the lamp device of FIG. 1;

FIG. 7 is a perspective view of a lamp device according to Embodiment 2 of the present invention.

FIG. 8 is a sectional view taken along the line aa in FIG. 7;

FIG. 9 is a schematic front sectional view of the lamp device of FIG. 7;

FIG. 10 is a perspective view showing a conventional transmission / reception facility using electric communication.

FIG. 11 is a perspective view showing a conventional transmission / reception facility using optical communication.

FIG. 12 is a perspective view showing a lamp device using a light emitting element in the receiving and transmitting equipment of FIG. 11;

FIG. 13 is a perspective view showing an example of the arrangement of lamp devices in the transmission / reception facility of FIG. 11;

FIG. 14 is a perspective view showing a light distribution pattern in the arrangement example of the lamp device of FIG. 13;

FIG. 15 is a perspective view of an optical communication lamp device according to a conventional example.

FIG. 16 is a light distribution diagram in the lamp device of FIG. 1;

FIG. 17 is a light distribution diagram in the lamp device of FIG. 7;

18 is a light distribution diagram in the lamp device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st trough-shaped mirror 2 2nd trough-shaped mirror 3 3rd trough-shaped mirror 4 Light emitting element 5 Opening 6 Lead frame 7 Lead 8 Small plane mirror 9 Wiring 10 Pier 11 Window 12 First part 13 Second Part 14 third part 15 notch 20 active layer 30 lamp device 40 area 41 area 42 area 71 first path 72 second path 73 third path 74 first path 1C center axis 1B center axis

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 10/22

Claims (9)

[Claims] 1. At least (a) a trough-shaped first mirror having a parabolic surface on a concave surface, and (b) a concave surface of the first mirror which is arranged at both ends in a longitudinal direction of the first mirror and is inclined. A trough-shaped second mirror having a paraboloid on a concave surface provided in a pair so as to open the second mirror, and (c) two optical communication optical mirrors disposed opposite to the trough-shaped second mirror, respectively. The lamp device comprises: a light emitting element; and (d) a small flat mirror disposed at each position of the light emitting element and reflecting light on the trough mirror. Lamp unit for optical communication. 2. The lamp device according to claim 1, further comprising a third trough-shaped mirror disposed at the center of the first mirror and having a parabolic surface on a convex surface provided to divide the concave surface of the first mirror. 2. The optical communication lamp device according to claim 1, wherein: 3. At least (a) the concave surface has a parabolic surface, the focal length A of the parabolic surface is 2.1 ± 0.1 mm, and the aspect ratio of the trough is 1: 1.3-1. : A trough-shaped first mirror within a range of 15.7; and (b) a distance B from a central axis 1C that divides the trough-shaped first mirror into left and right at a distance B of 6.74 ± 0.1 mm. The center is located at a position where the height C from the inner bottom is 0.0 ± 0.1 mm, and the angle D of the first mirror with respect to the inner bottom is 80 degrees.
The focal length E is 0.75 ± 0.05 mm which is arranged in a pair so as to open the concave surface of the first mirror at ± 1 °.
A trough-shaped second mirror having a concave parabolic surface,
(C) The distance H from the center axis 1C that divides the first mirror into left and right is 6.35 ± 0.1 mm, and the active layer is the first mirror.
Two light-emitting elements for optical communication respectively arranged at a height A from the inner bottom of the mirror; and (d) the trough-shaped mirrors respectively arranged at the positions of the light-emitting elements. And a small flat mirror provided so as to reflect light. 4. The lamp apparatus according to claim 1, wherein the lamp device is a first trough-shaped lamp.
At the center of the mirror, at a position where the height F from the inner bottom of the first mirror is 1.0 ± 0.1 mm, the center is arranged so as to divide the concave surface of the first mirror, and the focal length G is 1 .0
The third trough type with a paraboloid of ± 0.1mm on the convex surface
4. The optical communication lamp device according to claim 3, further comprising a mirror. 5. The lamp device according to claim 1, wherein the lamp device is disposed at a rectangular ring-shaped opening edge formed by the first mirror having a concave surface and the pair of second mirrors having a concave surface.
Has an elliptical opening with a short width K of 8.8 ± 0.5 mm and a thickness I of 0.1 to 5 m.
5. The lamp device for optical communication according to claim 3, further comprising a lead frame having a length m. 6. The lamp device according to claim 1, wherein the dimensions of the focal length A, the distance B, the height C, the focal length E, and the distance H correspond to dimensions that are enlarged or reduced at a fixed ratio. The lamp device for optical communication according to any one of claims 3 to 5, wherein the lamp device has a similar shape as a part of the lamp device. 7. The lamp device according to claim 1, wherein each of the height F and the focal length G has a dimension that is enlarged or reduced at a fixed ratio as a dimension of each corresponding portion. The lamp device for optical communication according to any one of claims 3 to 6, wherein 8. A lead having a similar shape in which the lamp device has a dimension in which each dimension of the long width J, the short width K, and the thickness I is enlarged or reduced at a fixed ratio as a dimension of each corresponding portion. The lamp device for optical communication according to any one of claims 3 to 7, wherein the lamp device includes a frame. 9. An optical communication system using the lamp device for optical communication according to claim 1. Description: