JPH10228813A - Light projecting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized light projecting equipment used in a field of technology for direct free-space optical transmission. SOLUTION: This equipment is equipped with a light emitting element 10, a base plate 12 which the light emitting element 10 is fixed to and also has wiring (20) connected electrically to a terminal (18) of the light emitting element 10, a base plate 14 which the base plate 12 is fixed to and also has wiring (36) connected electrically to the wiring (20), and a fixed member 28 which is to fix the base plate 12 to the base plate 14 with a specific angle and also acts as a conductive means 28 to connect the wiring (20) and the wiring (36) electrically. The base plate 14 has a notch 38 for a part of the light emitting element 10 on the base plate 12 to be fitted when the base plate 12 is fixed. In this constitution, the base plate 14 is positioned within a range in a thickness direction of the light emitting element 10, so that a thickness of the equipment is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device, for example, a VICS (Vehicle Information and Communication System).
stem: UTMS (Universal Traffic Management System) which is the main system of road traffic information communication system
s: New traffic management system), etc.

[0002]

2. Description of the Related Art A UTMS, which is one of the typical examples using the spatial light transmission technology, collects traffic information and processes information,
Based on this, the system aims to provide real-time traffic information to each vehicle in VICS or the like, and to actively manage the traffic flow including the efficiency of passenger and logistics. In this UTMS, traffic information is collected and provided through two-way optical communication between a roadside device arranged on the road and a vehicle-mounted device mounted on each vehicle. Note that both the roadside device and the on-vehicle device are composed of a light emitting device and a light receiving device.

[0003] Roadside units are arranged above the road, and optical communication is possible with on-vehicle units of vehicles entering respective communication areas. Since the communication area extends obliquely downward from the installation point of the roadside device, the transmission / reception direction of the vehicle-mounted device installed on the dashboard of the vehicle generally needs to be directed obliquely upward. For example, FIG.
In the conventional in-vehicle light emitting device as shown in (b) and (c), the light emitting diode 1 for emitting an optical digital signal is arranged at a fixed angle with respect to the installation surface 3 of the case 2.

The light emitting device shown in FIG. 5A has a light emitting diode 1 fixed obliquely on a circuit board 4 having an electric circuit for controlling the light emitting diode 1.
In the light emitting device shown in FIG. 5B, the light emitting diode 1 is fixed on the circuit board 4 at a right angle, and is assembled obliquely in the case 2. Further, the light projecting device shown in FIG. 5C has substantially the same configuration as that of FIG. 5B, except that the case 2 is provided with an angle adjusting mechanism 5.

[0005]

There are various problems in the above-mentioned conventional general light projecting device. That is, in the light emitting device shown in FIG. 5, since the light emitting diode 1 is mounted on one surface of the circuit board 4, the total of the thickness of the light emitting diode 1 and the thickness of the circuit board 4 is the minimum of the device. Dimensions are required, and the entire apparatus tends to be large. In particular, in the light emitting devices of FIGS. 5B and 5C, since the circuit board 4 is disposed obliquely, the light emitting devices of FIGS.
The size is considerably larger than that in which the circuit board 4 is arranged horizontally as shown in FIG.

An object of the present invention is to provide a novel light emitting device that can be reduced in size.

[0007]

In order to achieve the above object, the present invention provides a light emitting element and a first wiring to which the light emitting element is fixed and which is electrically connected to a terminal of the light emitting element. A first substrate having the first substrate fixed thereto, a second substrate having a second wiring electrically connected to the first wiring, and a first substrate provided on the second substrate. A fixing member for fixing at a predetermined angle, the fixing member having conductive means for electrically connecting a first wiring and a second wiring, and the second substrate When one substrate is fixed, a part of the light emitting element on the first substrate has a notch or a hole into which a part is dropped.

In this configuration, the second substrate is located within the range of the thickness of the light emitting element, and the thickness of the assembly including the light emitting element, the first substrate, the second substrate, and the fixing member is reduced. It is mainly determined by the thickness of the light emitting element.

The fixing member may be provided separately and independently, or may be formed as a part of the first substrate.

Further, in order to easily perform the electrical connection and the fixing, the second substrate is provided with a hole, a notch or a groove into which at least a part of the fixing member is fitted. Alternatively, it is preferable to dispose the second wiring at a position adjacent to the groove.

[0011]

1 to 3 show a preferred embodiment of a light emitting device according to the present invention used as a vehicle-mounted device in a UTMS or the like. In the figure, reference numeral 10 denotes a light emitting diode (light emitting element) for transmission. In this embodiment, a plurality of (three in the figure) chips arranged side by side are molded and integrated with a transparent resin. It is. Also, reference numeral 1
Reference numeral 2 denotes a wiring board to which the light emitting diode 10 is fixed (first
Reference numeral 14 denotes a circuit board (second board) having an electric circuit for controlling light emission of the light emitting diode 10.

The wiring board 12 has a substantially U-shape including a central portion 12a and end portions 12b, 12c, and the light emitting diode 10 is disposed in a space 16 between these portions 12a, 12b, 12c without any gap. It is dimensioned as follows. The light emitting diode 10 disposed in the space 16 has an anode terminal 18a and a cathode terminal 18b connected to the wiring board 12.
It is fixed by being electrically connected to the corresponding wirings (first wirings) 20a and 20b by soldering. Note that the light emitting diode 10 shown in FIG.
The fixing conductors 22a, 22b, and 22c are protrudingly provided, and the fixing conductors 22a, 22b, and 22c are soldered to the soldering lands 24a, 24b, and 24c on the wiring board 12, so that the light emitting diode 10 can be more firmly mounted. And it is fixed with higher positional accuracy. The light emitting diode 10 fixed to the wiring board 12 has its transmission (light emission) direction oriented substantially perpendicular to the surface of the wiring board 12.

Lands 26a, 26b for fixing members are formed on the respective end portions 12b, 12c of the wiring board 12, and
Each of the anode side wiring 20a and the cathode side wiring 2
Conduction with 0b is established. Land 26 for each fixing member
Fixing members 28a and 28b for fixing the wiring board 12 to the circuit board 14 are fixed to a and 26b. The fixing members 28a and 28b are plate-shaped members made of a conductor such as copper, and have protruding pieces 30a and 30b formed at one edge thereof. The fixing members 28a, 28b
a and 30b are preferably soldered to the lands 26a and 26b of the wiring board 12 to be fixed on the wiring board 12 and to the corresponding terminals 18 of the light emitting diode 10.
a, 18b.

Claws 32a and 32b are integrally formed at the bottom ends of the fixing members 28a and 28b.
a, 32b are formed in holes 34a, 34 formed in fixed substrate 14.
The fixing members 28a and 28b, and eventually the wiring board 12 are fixed to the circuit board 14 by inserting them into the circuit board 14 by using appropriate fixing means such as soldering. Each hole 34
a and 34b are the anode terminals 18 of the light emitting diode 10;
a and the wiring (second wiring) 36a, 36b of the electric circuit to be electrically connected to the cathode terminal 18b. Therefore, the wirings 36a, 36b of the electric circuit are fixed to the fixing members 28a, 28b and the wiring 20a. , 20b to the corresponding terminals 18a, 18b of the light emitting diode 10.

A notch 38 is formed in the circuit board 14 between the holes 34a and 34b. The width of the notch 38 is substantially the same as the width of the wiring board 12, and the fixing members 28a, 2
When the circuit board 8 b is fixed to the circuit board 14, the wiring board 12 and a part of the light emitting diode 10 are arranged so as to be dropped into the notch 38. The surfaces of the protruding pieces 30a and 30b of the fixing members 28a and 28b fixed on the circuit board 14 are inclined at a predetermined angle with respect to the surface of the circuit board 14. Therefore, the fixing members 28a and 28b are
4, the transmission direction of the light emitting diode 10 on the wiring board 12 is also at a constant angle with respect to the surface of the circuit board 14.

In FIG. 1, reference numeral 40 denotes a case, in which the circuit board 14 is assembled substantially parallel to the case bottom surface 42. Since the case bottom surface 42 is installed on a dashboard (not shown) of the vehicle, the light-emitting diodes 10 are obliquely directed upward.

In such a configuration, as understood from FIG. 1, the circuit board 14 is located within a range in the thickness direction of the light emitting diode 10. That is, the thickness (height) of the assembly including the light emitting diode 10, the wiring board 12, the circuit board 14, and the fixing members 28a and 28b is substantially the thickness T of the light emitting diode 10.
Compared to the sum of the thickness of the light emitting diode and the thickness of the circuit board in the past corresponding to the thickness of the assembly, the thickness of the present invention is considerably reduced. Conventionally, when an electric resistance, an electronic device, or the like is disposed on the back side of the circuit board, the thickness is increased accordingly. However, in the configuration of the present invention, the electronic board is also provided on the back side of the circuit board 14. The device 44 and the like can be mounted, and thereby, the surface area of the circuit board 14 can be reduced.

Although the preferred embodiments of the present invention have been described in detail, it goes without saying that the present invention is not limited to the above embodiments. For example, the light emitting diode 10 in the above embodiment includes a plurality of chips, but a plurality of light emitting diodes formed of one chip may be fixed to the wiring board.

As shown in FIG. 4, portions 46a and 46b bent at the ends of the wiring board 12 may be used as fixing members. In this case, since the portions 46a and 46b functioning as fixing members are made of an insulator, the extension wiring (conductive means) 4 extending from the wirings 20a and 20b.
8a and 48b need to be extended to the claws 50a and 50b.

Further, the part for dropping a part of the light emitting diode 10 is not limited to the notch 38, but may be a hole 52 as shown in FIG. Also, the fixing members 28a, 2
8b; claws 32a, 32b of 46a, 46b; 50a,
The portion where the 50b is inserted can also have various shapes such as notches and grooves (not shown).

[0021]

As described above, according to the present invention, the light emitting element can be installed at a desired angle and the size of the entire device can be reduced. It is desirable that the articles placed on the dashboard of the vehicle be as small as possible in order to ensure the driver's field of view, but the present invention can sufficiently satisfy such a demand.

According to the present invention, as a light emitting device for spatial light transmission, it can be installed on an inclined installation surface or set at an angle for projecting light in an oblique direction, and can be stored in a thin and small space. It can meet the demands you want.

[Brief description of the drawings]

FIG. 1 is a side view showing a light projecting device according to the present invention, showing a case in cross section.

FIG. 2 is a perspective view showing an internal structure of the light emitting device of FIG.

FIG. 3 is an exploded perspective view showing an internal structure of the light emitting device of FIG.

FIG. 4 is an exploded perspective view similar to FIG. 3, showing another embodiment of the present invention.

FIGS. 5A to 5C are schematic diagrams each showing a conventional light projecting device.

[Explanation of symbols]

10: light emitting diode (light emitting element), 12: wiring board (first board), 14: circuit board (second board), 18
a: anode terminal, 18b: cathode terminal, 20a, 2
0b ... wiring (first wiring), 28a, 28b (46a,
46b) ... fixing member, 32a, 32b (50a, 50
b) ... claws, 34a, 34b ... holes, 36a, 36b ... wiring (second wiring), 38 ... notches, 40 ... case, 52
…hole.

Claims (3)

[Claims] A first light emitting element fixed to the light emitting element and electrically connected to a terminal of the light emitting element;
A first substrate having a first wiring, and a second substrate fixed to the first substrate and electrically connected to the first wiring.
And a fixing member for fixing the first substrate to the second substrate at a predetermined angle, wherein the first substrate and the second wiring are electrically connected to each other. The fixing member having conductive means for electrically connecting the first substrate and the second substrate, when the first substrate is fixed, a part of the light emitting element on the first substrate A light projecting device having a notch or a hole to be dropped. 2. The light projecting device according to claim 1, wherein the fixing member is formed as a part of the first substrate. 3. The second substrate has a hole, a notch or a groove into which at least a part of the fixing member is fitted, and the second substrate is located at a position adjacent to the hole, the notch or the groove. 3. The wiring according to claim 1, wherein two wirings are arranged.
3. The light emitting device according to claim 1.