JP2915267B2 - Light emitting device with solar cell - Google Patents

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 with a solar cell, which is turned on or off by using a solar cell as a power source, and more particularly to a traffic sign, a gaze guide, a road stud, and a curve. It can be suitably attached to a road sign such as a mirror, a road article such as a parking lot or a harbor stop, or an advertisement such as a sign or a sign, or an object such as a guide sign.

[0002]

2. Description of the Related Art Hitherto, a light-emitting device in which a light-emitting body such as an LED is turned on or blinked to enhance visibility at night has been widely used. A commercial power supply or a solar cell is used as a power supply of the luminous body, but a commercial power supply uses
Since it takes time for wiring such as aerial cables and underground wiring, construction using solar cells that are easy to install is now mainstream.

[0003]

However, the light emitting device using a solar cell as described above has the following problems. That is, in the case of using a solar cell, the charging device is charged once with the power of the solar cell generated during the day,
At night, the luminous body is illuminated by the charging power,
Conventionally, a secondary battery such as a lead storage battery or a Ni-Cd battery has been used as this charging device. This type of secondary battery requires water replenishment every certain period of time, cycle life is several years, it is necessary to replace it with a new one every few years, and reactant gas etc. is generated at the time of charging and discharging For this reason, it was not possible to prevent the harmful effects of rainwater, moisture and the like from being fixed and integrated into the case with a sealing material, and the maintenance was troublesome. Further, the operating temperature range is narrow, and if used beyond this range, the service life becomes extremely short. Further, if the battery is left after being completely discharged, it cannot be recharged or the service life is shortened. Furthermore, due to the characteristics of these secondary batteries, overcharge prevention circuits and overdischarge prevention circuits are required,
The charge / discharge circuit was complicated.

Accordingly, the present invention solves the above-mentioned problems in a luminescent sign using a solar cell, makes the maintenance almost unnecessary, prevents an adverse effect due to ingress of rainwater or moisture, and simplifies a charge / discharge circuit. It is an object of the present invention to provide a simplified light emitting device with a solar cell.

[0005]

In order to achieve the above object, the present invention has the following arrangement. That light emitting device with a solar cell according to the present invention, at least a solar cell, an electric double layer capacitor to charge the electric power generated in the solar cell, secured integrally with a sealing material and a control circuit within the case, thus these solar Battery, electric double layer capacitor, control
Prevents the circuit from being adversely affected by rainwater, moisture, etc.
The electric power for charging the electric double layer capacitor is supplied to the light emitter through the control circuit, and the light emitter is turned on or off.

[0006]

In the light emitting device with a solar cell according to the present invention, the electric power generated by the solar cell is charged to the electric double layer capacitor, so that the charge / discharge circuit is simpler than that of a conventional secondary battery.
In addition, since almost no maintenance is required, and since the solar cell and the control circuit including the electric double layer capacitor are fixedly integrated with a sealing material, the solar cell and the control circuit are prevented from being adversely affected by rainwater, moisture and the like.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of a light emitting device with a solar cell according to the present invention, and FIG. 2 is a sectional view of FIG. 1 and 2, reference numeral 1 denotes a case.
One side is protruded in a conical shape, and a central portion of the conical side is perforated to form a light emitting window 11 and the light emitting window 11 is formed.
The luminous body 2 is attached to the outside. A solar cell 3 is disposed in an upper part inside the case 1, and an electric double layer capacitor 4 and a control circuit 5 are respectively disposed in a lower part of the solar cell 3. 4. The control circuit 5 is fixedly integrated with the sealing material 6.

The case 1 is made of a transparent material such as a transparent synthetic resin made of polycarbonate, acrylic or the like or a transparent material such as tempered glass so that the solar cell 3 can be illuminated with sunlight. Although simplified and preferable, only the upper portion facing the solar cell 3 may be formed of a transparent material, and the other portions may be formed of an opaque material such as an opaque synthetic resin or metal, and the upper portion of the case 1 is notched. The upper surface of the solar cell 3 may be exposed from the notch.

As the luminous body 2, an LED, electroluminescence, miniature bulb or the like is generally used. The light-emitting body 2 is preferably detachably attached to the case 1 so that it can be replaced. A protective cover made of a transparent material may be fitted over the entire surface of the light-emitting body 2. The number of the luminous bodies 2 to be attached may be one or more. The object to which the device of the present invention is to be attached by extending the lead wire without attaching the luminous bodies 2 to the case 1 It may be directly attached to.

The solar cell 3 is generally made of a single crystal or polycrystal silicon crystal, amorphous, or compound semiconductor, but is not particularly limited.

The electric double layer capacitor 4 has the following features as compared with a conventional secondary battery. That is, the electric double layer capacitor 4 does not require a charge voltage control circuit, and can be charged by directly connecting the electric double layer capacitor 4 to the output terminal of the solar cell 3, and the charging voltage of the electric double layer capacitor 4 is The output voltage of the solar cell 3 is unstable in proportion to the sunshine, but can be efficiently charged from 0 volt to the rated voltage, since the voltage rises according to the amount of charging current. Therefore, the charge / discharge circuit can be simplified. In addition, maintenance such as rehydration is unnecessary,
The electric double layer capacitor 4 has characteristics such as a long cycle life since it does not involve an internal chemical reaction. Therefore, as in the present invention, the electric double layer capacitor 4 is fixed and integrated into the case 1 with the sealing material 6 to allow entry of rainwater or moisture. It can prevent adverse effects. The number of the electric double layer capacitor 4 may be one or plural, and the number depends on the type and quantity of the luminous body 2 to be used and the type, capacity, application, etc. of the electric double layer capacitor 4. It is determined as appropriate based on comprehensive consideration.

The control circuit 5 is for controlling the operation of the luminous body 2 and starts the operation of the luminous body 2 by sensing the surrounding darkness, for example, or at a predetermined time interval. The control of starting the operation of the luminous body 2, performing only the lighting operation, and repeating the blinking operation is performed. Therefore, the control circuit 5 includes an on / off circuit for starting the operation of the luminous body 2 and an illuminance sensor such as a photodiode or a photocell when starting the operation of the luminous body 2 by sensing the surrounding darkness. When a circuit or a circuit that detects a difference in generated power of the solar cell 3 between day and night to determine night is used, a timer circuit or the like is used to start the operation of the luminous body 2 at regular time intervals. In order to perform the above, a switching circuit or the like is appropriately provided.

The sealing material 6 for fixing and integrating the solar cell 3, the electric double layer capacitor 4 and the control circuit 5 is as follows.
Synthetic resins such as silicone resins are generally used because of their high insulation properties and excellent water resistance.

FIG. 3 is a circuit block diagram showing the operation of the above embodiment. In FIG. 3, first, the solar cell 3 is irradiated with sunlight to generate power, and the generated power is charged in the electric double layer capacitor 4 via the backflow prevention diode 7. The backflow prevention diode 7 is for preventing electricity from flowing from the electric double layer capacitor 4 to the solar cell 3 side at night when the power generated by the solar cell 3 decreases. Next, the charging power charged in the electric double layer capacitor 4 is supplied to the luminous body 2 via the control circuit 5, and under the control of the control circuit 5, the luminous body 2 is turned on or off in an appropriate manner.

[0016]

As described above in detail, the light emitting device with a solar cell according to the present invention charges the electric power generated by the solar cell to the electric double layer capacitor, so that the light emitting device is compared with the conventional secondary battery.
The charge / discharge circuit is simple, requires little maintenance, and the solar cell and control circuit, including the electric double layer capacitor, are fixedly integrated with the sealing material. From traffic signs, gaze guides, road tacks, curve mirrors, etc. It is possible to attach even the target object suitably.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a light emitting device with a solar cell according to the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a circuit block diagram showing an operation of the embodiment according to FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Light-emitting body 3 Solar cell 4 Electric double layer capacitor 5 Control circuit 6 Sealing material 7 Backflow prevention diode

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G08B 5/00-5/36 H01L 31/04 H02J 1/00 306

Claims (1)

(57) [Claims] And 1. A least solar cell, an electric double layer capacitor to charge the electric power generated in the solar cell, secured integrally with a sealing material and a control circuit within the case, thus these solar
Use batteries, electric double-layer capacitors, and control circuits for rainwater, moisture, etc.
A light-emitting device with a solar cell, wherein the light-emitting device is turned on or blinks by supplying charging power for the electric double-layer capacitor to the light-emitting body through the control circuit , thereby preventing the light-emitting body from being adversely affected by the intrusion of the light-emitting body.