JP2022133545A - Light radiation module and light radiation device - Google Patents

Abstract

An object of the present invention is to provide a light irradiation module and a light irradiation device capable of suppressing failure of a light emitting element even when the light irradiation module is connected with reverse polarity. A light irradiation module according to an embodiment includes at least one light emitting element; a first terminal electrically connected to an anode side of the light emitting element; and electrically connected to a cathode side of the light emitting element. a resistor connected in parallel with the second terminal between the cathode of the light emitting element and the second terminal; and a third terminal electrically connected to the resistor and ; [Selection drawing] Fig. 1

Description

TECHNICAL FIELD Embodiments of the present invention relate to a light irradiation module and a light irradiation device.

Light irradiation modules equipped with light-emitting diodes are becoming popular in place of light irradiation modules equipped with lamps having filaments and light irradiation modules equipped with discharge lamps from the perspectives of longer life, energy saving, and miniaturization. progressing. In recent years, a light irradiation module including a light-emitting diode that emits ultraviolet light, a light-emitting diode that emits infrared light, and the like has been proposed.

Here, since the light emitting diode is a DC driven element, it has polarity. That is, the anode terminal of the light emitting diode must be electrically connected to the positive terminal of the power source, and the cathode terminal of the light emitting diode must be electrically connected to the negative terminal of the power source.

For example, in the manufacturing process, a highly skilled worker electrically connects the light irradiation module (light emitting diode) and the lighting device, so that the light irradiation module is connected to the lighting device with the opposite polarity. is rare. However, during maintenance work, an unskilled worker may electrically connect the light irradiation module and the lighting device. can occur. In addition, when manufacturing the light irradiation module, the polarity of the light emitting diode may be mistakenly mounted on the substrate.

If a reverse voltage is applied to the light-emitting diodes because the light irradiation modules are connected with opposite polarities, the light-emitting diodes may not irradiate light or may cause malfunction of the light-emitting diodes. In this case, since the light-emitting diode that emits ultraviolet rays is expensive, the failure of the light-emitting diode that emits ultraviolet rays will have a large impact on the manufacturing cost. It is also conceivable to provide a protection element such as a diode in the light irradiation module, but it is difficult to completely prevent failure of the light emitting diode.
Therefore, it has been desired to develop a technique that can prevent a light-emitting element such as a light-emitting diode from failing even if the light irradiation module is connected with the opposite polarity.

JP 2012-243484 A

The problem to be solved by the present invention is to provide a light irradiation module and a light irradiation device that can suppress failure of light emitting elements even when the light irradiation modules are connected with opposite polarities.

A light irradiation module according to an embodiment includes at least one light emitting element; a first terminal electrically connected to an anode side of the light emitting element; a second terminal electrically connected to a cathode side of the light emitting element; a resistor connected in parallel with the second terminal between the cathode of the light emitting element and the second terminal; a third terminal electrically connected to the resistor; is equipped with

ADVANTAGE OF THE INVENTION According to embodiment of this invention, the light irradiation module and light irradiation apparatus which can suppress that a light emitting element malfunctions even if a light irradiation module is connected by a reverse polarity can be provided.

It is a schematic diagram for illustrating the light irradiation apparatus which concerns on this Embodiment. It is a schematic diagram for illustrating the light irradiation apparatus which concerns on a comparative example. FIG. 10 is a schematic diagram illustrating a case where the light irradiation module is connected to the lighting device with opposite polarity; FIG. 10 is a schematic diagram illustrating a case where the connection state of the light irradiation module is inappropriate;

Hereinafter, embodiments will be illustrated with reference to the drawings. In addition, in each drawing, the same reference numerals are given to the same constituent elements, and detailed description thereof will be omitted as appropriate.
FIG. 1 is a schematic diagram for illustrating a light irradiation device 200 according to this embodiment.
As shown in FIG. 1 , the light irradiation device 200 has, for example, a light irradiation module 1 and a lighting device 100 .
The light irradiation module 1 has a substrate 10, a light emitting element 20, and a resistor 30, for example.

The substrate 10 can be a plate-like body. The planar shape of the substrate 10 is not particularly limited, and can be changed as appropriate according to, for example, the number and arrangement of the light emitting elements 20 and the shape of the housing in which the light irradiation module 1 is accommodated. The planar shape of the substrate 10 can be, for example, a polygon such as a quadrangle.

Substrate 10 may be formed from an insulating material. The substrate 10 is made of, for example, an inorganic material such as ceramics (eg, aluminum oxide or aluminum nitride), or an organic material such as paper phenol or glass epoxy. Also, the substrate 10 may be a metal core substrate in which the surface of a metal plate is coated with an insulating material.

When the amount of heat generated by the light emitting element 20 is large, it is preferable to form the substrate 10 using a material with high thermal conductivity from the viewpoint of heat dissipation. Examples of materials with high thermal conductivity include ceramics such as aluminum oxide and aluminum nitride, high thermal conductive resins, and metal core substrates. The high thermal conductivity resin can be, for example, a resin such as PET (polyethylene terephthalate) or nylon mixed with a filler made of aluminum oxide, carbon, or the like.

A wiring pattern 11 is provided on one surface of the substrate 10 . The wiring pattern 11 is made of, for example, a low resistance metal such as copper, aluminum or silver. The wiring pattern 11 includes, for example, a mounting pad 11a, a mounting pad 11b, a terminal 11c (corresponding to an example of a first terminal), a terminal 11d (corresponding to an example of a second terminal), and a terminal 11e (corresponding to a third terminal). corresponding to an example).

A light emitting element 20 is mounted on the mounting pad 11a.
A resistor 30 is mounted on the mounting pad 11b.
The terminals 11c, 11d, and 11e are arranged side by side along one side of the substrate 10, for example.
The terminal 11 c is electrically connected to the anode side of the light emitting element 20 .
The terminal 11 d is electrically connected to the cathode side of the light emitting element 20 .
Terminal 11 e is electrically connected to resistor 30 .

The light emitting element 20 can be, for example, a light emitting diode, an organic light emitting diode, a laser diode, or the like.
At least one light emitting element 20 can be provided. When multiple light emitting elements 20 are provided, the multiple light emitting elements 20 can be connected in series as shown in FIG. Also, a plurality of circuits in which a plurality of light emitting elements 20 are connected in series may be connected in parallel.

The light emitted from the light emitting element 20 is not particularly limited. For example, the light emitting element 20 may irradiate visible light, may irradiate ultraviolet light (for example, wavelength 10 nm to 400 nm), or infrared light (for example, wavelength 0.7 μm). ~1000 μm).

Also, the format of the light emitting element 20 is not particularly limited. The light-emitting element 20 is, for example, a surface-mounted light-emitting diode such as a PLCC (Plastic Leaded Chip Carrier) type, a bullet-shaped light-emitting diode having lead wires, or a chip-shaped light-emitting diode mounted by a COB (Chip On Board). and so on. When the chip-shaped light-emitting element 20 is used, a frame-shaped reflector surrounding the chip-shaped light-emitting diode, a sealing portion provided inside the frame-shaped reflector and covering the chip-shaped light-emitting diode, or the like is appropriately used. can be provided. The chip-shaped light emitting diode may be any of an upper electrode type light emitting diode, an upper and lower electrode type light emitting diode, and a flip chip type electrode type light emitting diode.

Here, since the light-emitting element 20 is a current-driven element, it has polarity. Therefore, unless a positive voltage is applied to the anode side of the light-emitting element 20, the light-emitting element 20 may not irradiate light, or the light-emitting element 20 may malfunction. Also, the lighting device 100 is detachable from the light irradiation module 1 . For example, the light irradiation module 1 and the lighting device 100 are electrically connected via wiring, a connector, or the like.

The electrical connection between the light irradiation module 1 and the lighting device 100 is performed not only during the manufacturing process, but also during the installation work of the light irradiation device 200, the replacement work of the light irradiation module 1 during maintenance, and the like. In other words, the electrical connection between the light irradiation module 1 and the lighting device 100 may be performed by a person in charge on the user side who has low work skill. Therefore, the light irradiation module 1 (light emitting element 20) may be electrically connected with opposite polarity. If the light emitting module 1 (light emitting element 20) is electrically connected with the opposite polarity, the light emitting element 20 may not emit light or may cause the light emitting element 20 to malfunction.

Therefore, the light irradiation module 1 is provided with the terminal 11 e and the resistor 30 . Terminal 11e and resistor 30 are connected in series. The series-connected terminal 11e and the resistor 30 are connected in parallel with the terminal 11d. That is, the resistor 30 is connected in parallel with the terminal 11d between the cathode of the light emitting element 20 and the terminal 11d.

The type of resistor 30 is not particularly limited. The resistor 30 can be, for example, a surface-mounted resistor, a resistor having lead wires (metal oxide film resistor), or a film resistor formed using a screen printing method or the like. A film resistor can be formed using, for example, a screen printing method and a firing method. The material of the film resistor can be ruthenium oxide (RuO ₂ ), for example.

Moreover, the light irradiation module 1 can be appropriately provided with a passive element or an active element used for forming a light emitting circuit having the light emitting element 20 as necessary. For example, the light irradiation module 1 may be provided with a capacitor for noise reduction and voltage smoothing. For example, the light irradiation module 1 may be provided with a current limiting resistor to prevent excessive current from flowing through the light emitting element 20 . In addition, the light irradiation module 1 is provided with, for example, diodes, positive characteristic thermistors, negative characteristic thermistors, inductors, surge absorbers, varistors, transistors such as bipolar transistors and field effect transistors, Zener diodes, integrated circuits, arithmetic elements, and the like. good too.

As shown in FIG. 1, the lighting device 100 has a rectifier circuit 111, a converter 112, a connection detection circuit 113, and a switch 114, for example.

The input side of the rectifier circuit 111 is electrically connected to, for example, an AC power supply 250 provided outside the light irradiation device 200 . The rectifier circuit 111 can, for example, full-wave rectify the AC voltage applied by the AC power supply 250 . The rectifier circuit 111 has, for example, a diode bridge.

The input side of the converter 112 is electrically connected to the output side of the rectifier circuit 111, for example. The positive terminal on the output side of converter 112 is electrically connected to terminal 100a via switch 114, for example. A negative terminal on the output side of the converter 112 is electrically connected to the terminal 100b, for example.

A terminal 100 a (corresponding to an example of a fourth terminal) is electrically connected to the terminal 11 c of the light irradiation module 1 . A terminal 100 b (corresponding to an example of a fifth terminal) is electrically connected to the terminal 11 d of the light irradiation module 1 . A terminal 100 c (corresponding to an example of a sixth terminal) is electrically connected to the terminal 11 e of the light irradiation module 1 .

Converter 112 converts the voltage full-wave rectified by rectifier circuit 111 into a predetermined DC voltage. Converter 112 has, for example, a switching circuit. Converter 112 may comprise, for example, a flyback converter, a circuit that combines a boost chopper and a step-down chopper, and the like.

Also, the converter 112 may be provided with a constant current circuit. If the converter 112 is provided with a constant current circuit, a constant DC current can be supplied to the light irradiation module 1 . For example, a constant DC current may be supplied to the light irradiation module 1 by PWM-controlling a switching element provided in the switching circuit. In this case, for example, the output current to the light irradiation module 1 can be detected, and the ON time or ON duty of PWM control can be controlled so that the detected output current value and the target current value match.

The connection detection circuit 113 is electrically connected to the terminal 100c. The connection detection circuit 113 detects at least one of voltage and current input via the terminal 100c. The connection detection circuit 113 determines at least one of the polarity of the light irradiation module 1 connected to the lighting device 100 and the connection state of the light irradiation module 1 by comparing the detection value with a predetermined threshold value. Note that the threshold used for the determination can be appropriately determined based on the number of light emitting elements 20, the connection form of the light emitting elements 20, the voltage characteristics of the light emitting elements 20, the resistance value of the resistor 30, and the like.

For example, the connection detection circuit 113 can determine that the light irradiation module 1 is connected to the lighting device 100 with correct polarity when the detected value is equal to or less than a predetermined threshold.
For example, when the detected value exceeds a predetermined threshold, the connection detection circuit 113 can determine that the light irradiation module 1 is connected to the lighting device 100 with the opposite polarity.
For example, when the detection value is “0 (zero)” or substantially “0 (zero)”, the connection detection circuit 113 determines that the light irradiation module 1 is not connected to the lighting device 100 or is not connected. It can be determined to be incomplete.

Also, the connection detection circuit 113 controls the switch 114 based on the determination result.
Details of the actions and effects of the resistor 30 and the terminal 11e provided in the light irradiation module 1 and the connection detection circuit 113 and the switch 114 provided in the lighting device 100 will be described later.

Switch 114 is electrically connected to terminal 100a. For example, switch 114 is electrically connected between the positive output terminal of converter 112 and terminal 100a. The switch 114 switches between applying the DC voltage to the light irradiation module 1 and stopping the application of the DC voltage based on the signal from the connection detection circuit 113 . Switch 114 may be, for example, a transistor or the like.

Next, functions and effects of the resistor 30 and the terminal 11e provided in the light irradiation module 1 and the connection detection circuit 113 and the switch 114 provided in the lighting device 100 will be further described.
First, a light irradiation device 300 according to a comparative example will be described.
FIG. 2 is a schematic diagram for illustrating a light irradiation device 300 according to a comparative example.
As shown in FIG. 2 , the light irradiation device 300 has a light irradiation module 301 and a lighting device 302 .

The light irradiation module 301 has a substrate 310 and light emitting elements 20 . The light irradiation module 301 is not provided with the resistor 30 and the terminal 11e described above.
The substrate 310 can be similar to the substrate 10 described above. A wiring pattern 311 is provided on one surface of the substrate 310 . The wiring pattern 311 has mounting pads 311a, terminals 311c, and terminals 311d.

The light emitting element 20 is mounted on the mounting pad 311a. The mounting pad 311a can be similar to the mounting pad 11a described above.
The terminals 311 c and 311 d are arranged side by side along one side of the substrate 310 .
The terminal 311 c is electrically connected to the anode side of the light emitting element 20 .
The terminal 311 d is electrically connected to the cathode side of the light emitting element 20 .

The lighting device 302 has a rectifier circuit 111 and a converter 112 . The lighting device 302 is not provided with the connection detection circuit 113 and the switch 114 described above.
A positive terminal on the output side of converter 112 is electrically connected to terminal 302a. The negative terminal on the output side of converter 112 is electrically connected to terminal 302b.

As described above, the light emitting element 20 has polarity. When the light irradiation module 301 is electrically connected to the lighting device 302, if the polarity of the connected light irradiation module 301 (light emitting element 20) is correct as shown in FIG. A voltage is applied. Therefore, a current flows through the light emitting element 20 and light is emitted from the light emitting element 20 .

However, since the light irradiation module 301 is detachably connected to the lighting device 302, the polarity of the connected light irradiation module 301 (light emitting element 20) may be reversed as described above. If a reverse voltage is applied to the light emitting element 20 because the light irradiation module 1 is connected with the opposite polarity, light may not be emitted from the light emitting element 20 or cause a failure of the light emitting element 20. . In this case, since the light-emitting element 20 that emits ultraviolet rays is expensive, if the light-emitting element 20 that emits ultraviolet rays breaks down, the manufacturing cost will be greatly affected. It is also conceivable to provide a protection element such as a diode in the light irradiation module 301, but it is difficult to completely prevent the failure of the light emitting element 20. FIG.

Therefore, the light irradiation module 1 according to the present embodiment is provided with the resistor 30 and the terminal 11e. The lighting device 100 is also provided with a connection detection circuit 113 and a switch 114 .

As shown in FIG. 1, when the light irradiation module 1 (light emitting element 20) is connected to the lighting device 100 with correct polarity and a voltage is applied to the terminal 11c, a forward voltage is applied to the light emitting element 20. FIG. Therefore, a current flows through the light emitting element 20 and light is emitted from the light emitting element 20 .
A part of the current flowing through the light emitting element 20 flows through the resistor 30, thereby generating a predetermined potential at the terminal 11e.

A terminal 100 c provided on the lighting device 100 is electrically connected to a terminal 11 e provided on the light irradiation module 1 . Therefore, the connection detection circuit 113 can detect the potential generated at the terminal 11e via the terminal 100c. For example, the connection detection circuit 113 detects at least one of voltage and current input via the terminal 100c.

For example, when the detected value is equal to or less than a predetermined threshold value, the connection detection circuit 113 determines that the polarity of the light irradiation module 1 connected to the lighting device 100 is correct, and controls the switch 114 so that the lighting device 100 maintain electrical connection with the light irradiation module 1.

FIG. 3 is a schematic diagram illustrating a case where the light irradiation module 1 is connected to the lighting device 100 with opposite polarity.
As shown in FIG. 3, when the light irradiation module 1 (light emitting element 20) is connected to the lighting device 100 with the opposite polarity and a voltage is applied to the terminal 11d, a reverse voltage is applied to the light emitting element 20. . Therefore, almost no current flows through the light emitting element 20 . Also, no light is emitted from the light emitting element 20 .

Further, when a voltage is applied to the terminal 11d of the light irradiation module 1, a current flows through the resistor 30 and a potential is generated at the terminal 11e. The potential in this case is higher than the potential when the light irradiation module 1 is connected to the lighting device 100 with the correct polarity.

For example, when the detected value exceeds a predetermined threshold, the connection detection circuit 113 determines that the light irradiation module 1 is connected to the lighting device 100 with the opposite polarity, and controls the switch 114 to The electrical connection between 100 and light irradiation module 1 is cut off. If the electrical connection between the lighting device 100 and the light irradiation module 1 is interrupted, no reverse voltage is applied to the light emitting element 20, so that the light emitting element 20 can be prevented from malfunctioning.

FIG. 4 is a schematic diagram illustrating a case where the connection state of the light irradiation module 1 is inappropriate.
As shown in FIG. 4, when the light irradiation module 1 and the lighting device 100 are not electrically connected, or when the electrical connection between the light irradiation module 1 and the lighting device 100 is incomplete, light is emitted. No current flows through the element 20, or the current flowing through the light emitting element 20 becomes extremely small.
In this case, the potential generated at the terminal 11e is "0 (zero)" or substantially "0 (zero)".

For example, when the detection value is “0 (zero)” or substantially “0 (zero)”, the connection detection circuit 113 determines that the light irradiation module 1 is not connected to the lighting device 100 or is not connected. When it is determined that it is incomplete, the switch 114 is controlled to cut off the electrical connection between the lighting device 100 and the light irradiation module 1 . If the electrical connection between the lighting device 100 and the light irradiation module 1 is cut off, it is possible to prevent the lighting device 100 from operating in a no-load state. Therefore, failure of the lighting device 100 can be suppressed.

Although some embodiments of the present invention have been illustrated above, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, etc. can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof. Moreover, each of the above-described embodiments can be implemented in combination with each other.

Reference Signs List 1 light irradiation module 10 substrate 11 wiring pattern 11c terminal 11d terminal 11e terminal 20 light emitting element 30 resistor 100 lighting device 100a terminal 100b terminal 100c terminal 111 rectifier circuit 112 converter 113 connection Detection circuit, 114 switch, 200 light irradiation device, 250 AC power supply

Claims (4)

at least one light emitting element;
a first terminal electrically connected to the anode side of the light emitting device;
a second terminal electrically connected to the cathode side of the light emitting device;
a resistor connected in parallel with the second terminal between the cathode of the light emitting element and the second terminal;
a third terminal electrically connected to the resistor;
A light irradiation module comprising: 2. The light irradiation module according to claim 1, wherein said first terminal, said second terminal, and said third terminal are arranged along one side of a substrate. A light irradiation module according to claim 1 or 2;
a lighting device detachable from the light irradiation module;
and
The lighting device is
a fourth terminal electrically connected to the first terminal of the light irradiation module;
a fifth terminal electrically connected to the second terminal of the light irradiation module;
a sixth terminal electrically connected to the third terminal of the light irradiation module;
a connection detection circuit electrically connected to the sixth terminal and detecting at least one of voltage and current;
has
The connection detection circuit compares a predetermined threshold with a detection value to determine at least one of the polarity of the light irradiation module connected to the lighting device and the connection state of the light irradiation module. Irradiation device. The lighting device further includes a switch electrically connected to the fourth terminal,
4. The light irradiation device according to claim 3, wherein said connection detection circuit controls said switch based on said determination result.

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