JP7637545B2 - Wedge-type vehicle bulb and stop/tail lamp - Google Patents

Description

The present invention relates to wedge-type vehicle bulbs and stop/tail lamps.

Conventionally, wedge-type vehicle bulbs (sometimes called wedge base bulbs; hereinafter, sometimes simply referred to as "vehicle bulbs") have been used as incandescent bulbs for vehicle lighting fixtures. Vehicle bulbs are bulbs that include a light source section equipped with a filament or the like, and a base section (a section that is inserted into a socket section to supply power) that is molded to be approximately flat and that fastens and holds the light source section. In recent years, there are also vehicle bulbs in which the filament in the light source section has been replaced with an LED. A vehicle lamp equipped with such a vehicle bulb is disclosed in the following Patent Document 1.

Figure 4(a) shows a front view of a conventional general vehicle bulb 100. As shown in Figure 4(a), the vehicle bulb 100 has a main body 110 that houses an LED and various circuit elements, and a substantially flat base 120. In order to accommodate vehicle lighting devices that have multiple functions (stop lamp and tail lamp), such as stop/tail lamps, a total of four terminals are provided on the base 120 of the vehicle bulb: two terminals for a light-emitting circuit (first light-emitting circuit) for emitting a stop light, and two terminals for a light-emitting circuit (second light-emitting circuit) for emitting a tail light.

As shown in FIG. 4(b), which is a bottom view of the vehicle bulb 100 (base portion 120), the terminals 121 and 124 of the first light-emitting circuit are disposed on the outside, and the terminals 122 and 123 of the second light-emitting circuit are disposed on the inside (terminals 121, 122, 123, and 124 are arranged in this order from the left side of the figure).

In contrast, the socket part into which the base part 120 is inserted has a total of four output terminals (two of which are shared internally), including two main line output terminals (contacts) that connect to the vehicle battery (vehicle power source) via the main line (main wiring) and two secondary line output terminals (contacts) that extend to the vehicle battery via a secondary line (secondary wiring) separate from the main line. Here, the four output terminals of the socket part are arranged in the order of main line positive terminal 71 (+), secondary line positive terminal 72 (+), secondary line negative terminal 73 (-), and main line negative terminal 74 (-) from the left in the figure, as shown in FIG. 5(a), which is a schematic plan view of the socket part (schematic plan view of the joint with the bottom surface of the base part 120).

JP 2003-212039 A

The LED has a polarity with respect to the direction of voltage application. Therefore, both the first light emitting circuit (stop light emitting circuit) connected to the main line output terminal of the socket and the second light emitting circuit (tail light emitting circuit) connected to the sub line output terminal include a diode that protects the LED from reverse voltage when connected in the reverse direction from the normal direction, and a surge absorbing element that protects the LED from negative transient voltage (for example, reverse voltage that occurs momentarily when the ignition or relay is disconnected).

At this time, the anode of the diode of the first light-emitting circuit is disposed on the terminal 121 side shown in FIG. 4(b), and the cathode is disposed on the terminal 124 side (terminal 121 is referred to as the "anode terminal of the first light-emitting circuit", and terminal 124 is referred to as the "cathode terminal of the first light-emitting circuit"). Also, the anode of the diode of the second light-emitting circuit is disposed on the terminal 122 side shown in FIG. 4(b), and the cathode is disposed on the terminal 123 side (terminal 122 is referred to as the "anode terminal of the second light-emitting circuit", and terminal 123 is referred to as the "cathode terminal of the second light-emitting circuit").

When the terminals of the socket and the terminals of the first and second light-emitting circuits are connected as follows, a forward voltage is applied to the first and second light-emitting circuits, causing a drive current to flow through the LED light source, and the stop light and the tail light are emitted.
(1) The main line positive terminal 71 of the socket portion and the anode terminal 121 of the first light-emitting circuit are connected.
(2) The secondary line positive terminal 72 of the socket portion and the anode terminal 122 of the second light-emitting circuit are connected.
(3) The secondary line negative terminal 73 of the socket portion and the cathode terminal 123 of the second light-emitting circuit are connected.
(4) The main line negative terminal 74 of the socket portion and the cathode terminal 124 of the first light-emitting circuit are connected.

In contrast, when the base portion 120 of the vehicle bulb 100 is rotated 180° from the above-mentioned state (in the reverse direction) and inserted into the socket portion 100, the terminals of the first light-emitting circuit and the second light-emitting circuit are arranged in the order of terminals 124, 123, 122, and 121 from the left, as shown in FIG. 4(c). As a result, the polarity of the terminals of the socket portion and the terminals of the first light-emitting circuit and the second light-emitting circuit do not match, and the current flowing through the first light-emitting circuit and the second light-emitting circuit is blocked by the reverse voltage protection diode.

Therefore, no drive current flows through the LED light source, and neither stop light nor tail light is emitted from the LED light source. However, if the base portion 120 of the vehicle bulb 100 is removed from the socket portion, then inverted (rotated 180 degrees to return it to the state shown in FIG. 4(b)) and inserted back into the socket portion, a forward voltage is applied to the first light-emitting circuit and the second light-emitting circuit, and a drive current flows through the LED light source. This ensures that the vehicle bulb 100 operates normally. Note that vehicle models equipped with a socket portion having this terminal arrangement are hereinafter referred to as "general vehicle models."

However, in socket parts installed on some special vehicle models (hereinafter referred to as "special vehicle models"), the terminal arrangement of the socket part may differ from the terminal arrangement of general vehicle models. Specifically, as shown in FIG. 5(b), which is a schematic plan view of the socket part of a special vehicle model (schematic plan view of the joint with the bottom surface of the base part 120), the terminals of the socket part are arranged from the left end of the figure as follows: main line positive terminal 81 (+), secondary line negative terminal 82 (-), secondary line positive terminal 83 (+), and main line negative terminal 84 (-).

At this time, when the terminals of the socket part and the terminals of the first light-emitting circuit and the second light-emitting circuit are connected as follows (when the base part 120 is inserted into the socket part in the state shown in FIG. 4(b)), the current flowing through the second light-emitting circuit is blocked by the reverse voltage protection diode. As a result, no tail light is emitted from the LED light source.
(1) The main line positive terminal 81 of the socket portion and the anode terminal 121 of the first light-emitting circuit are connected.
(2) The secondary line negative terminal 82 of the socket portion and the anode terminal 122 of the second light-emitting circuit are connected.
(3) The secondary line positive terminal 83 of the socket portion and the cathode terminal 123 of the second light-emitting circuit are connected.
(4) The main line negative terminal 84 of the socket portion and the cathode terminal 124 of the first light-emitting circuit are connected.

On the other hand, when the base portion 120 is rotated 180° from this state (state of FIG. 4(c)) and inserted into the socket portion, the terminals of the socket portion and the terminals of the first light-emitting circuit and the second light-emitting circuit are connected as follows: As a result, the current flowing through the first light-emitting circuit is blocked by the diode for power supply reverse connection protection, and the stop light is not emitted from the LED light source.
(1) The main line positive terminal 81 of the socket portion and the cathode terminal 124 of the first light-emitting circuit are connected.
(2) The secondary line negative terminal 82 of the socket portion and the cathode terminal 123 of the second light-emitting circuit are connected.
(3) The secondary line positive terminal 83 of the socket portion and the anode terminal 122 of the second light-emitting circuit are connected.
(4) The main line negative terminal 84 of the socket portion and the anode terminal 121 of the first light-emitting circuit are connected.

In other words, no matter how the base portion 120 of the vehicle bulb 100 is inserted into the socket portion, neither the stop light nor the tail light is emitted. However, this problem and the means for solving it are not disclosed or suggested in Patent Document 1. In addition, Patent Document 1 is not a stop/tail lamp in the first place.

Of course, the above problem can be solved by separately producing vehicle bulbs that are compatible with the sockets of special vehicle models. However, this solution requires that vehicle bulbs compatible with special vehicle models be produced separately from vehicle bulbs compatible with general vehicle models, which leads to high product manufacturing and management costs. In addition, if the one-way rectifier (e.g., diode) is removed from the first light-emitting circuit and the second light-emitting circuit and the circuit structure is changed to a two-way rectifier structure, the stop light and tail light can be emitted from the LED light source regardless of the direction (polarity) of the applied voltage. However, this solution increases the risk of damage to the LED light source due to reverse voltage, and leads to high manufacturing costs due to the complexity of the circuit structure.

In view of the above problems, the present invention aims to provide a wedge-type vehicle bulb that is highly versatile and does not result in excessive cost increases, while still ensuring normal operation in both general and special vehicle models, even if a polarized element is included in the first light-emitting circuit or the second light-emitting circuit. The present invention also aims to provide a stop/tail lamp equipped with the vehicle bulb.

In order to solve the above-mentioned problems, the wedge-type vehicle valve according to the present invention comprises:
A main body including an LED light source, a first light emitting circuit that causes the LED light source to emit a stop light, and a second light emitting circuit that causes the LED light source to emit a tail light;
A substantially flat base portion extending from the main body portion;
Equipped with
At least one of the first light-emitting circuit and the second light-emitting circuit includes a non-polarizing rectifier,
the other of the first light-emitting circuit and the second light-emitting circuit includes a reverse voltage protection unit ,
the base portion includes two terminals connected to the first light-emitting circuit and two terminals connected to the second light-emitting circuit,
the two terminals of the first light-emitting circuit are disposed on each side surface of the base portion outside the two terminals of the second light-emitting circuit and in point-symmetric positions with respect to the center of the base portion;
The two terminals of the second light-emitting circuit are disposed on each side surface of the base portion closer to the center than the terminals of the first light-emitting circuit and in point-symmetric positions with respect to the center of the base portion .

According to this aspect of the present invention, at least one of the first light-emitting circuit and the second light-emitting circuit is equipped with a non-polarized rectifier, so that even if a reverse voltage (a voltage in the opposite direction to the forward direction) is applied to at least one of the first light-emitting circuit and the second light-emitting circuit, a drive current can be passed through the LED light source. Therefore, normal operation is guaranteed regardless of whether the vehicle is a general-purpose vehicle or a special vehicle. In addition, since a highly versatile vehicle bulb can be provided in this way, excessive cost increases are not incurred.

According to this aspect of the present invention, since the other of the first light-emitting circuit and the second light-emitting circuit is provided with a reverse voltage protection unit, it is possible to provide a vehicle bulb that is highly versatile regardless of whether it is a general-purpose vehicle model or a special vehicle model, and it is also possible to effectively protect the LED light source from reverse voltage.

Furthermore, in the wedge-type vehicle valve according to the present invention,
The first light-emitting circuit includes a reverse voltage protection unit,
The second light-emitting circuit preferably includes a non-polarizing rectifier.

According to this aspect of the present invention, the risk of damage to the LED light source can be reduced by providing a reverse voltage protection unit in the stop light light-emitting circuit (first light-emitting circuit) that is used for long periods of time and frequently turns on and off, and is likely to be subjected to reverse voltage. In other words, the wedge-type vehicle bulb according to this aspect can operate normally regardless of whether it is a general vehicle model or a special vehicle model, and can reduce the risk of damage to the LED light source compared to an aspect in which a non-polarized rectifier unit is provided in both the first light-emitting circuit and the second light-emitting circuit, or an aspect in which a non-polarized rectifier unit is provided in the first light-emitting circuit and a reverse voltage protection unit is provided in the second light-emitting circuit.

Further, the stop/tail lamp according to the present invention is
The wedge-type vehicle valve is provided.

According to this aspect of the present invention, at least one of the first light-emitting circuit and the second light-emitting circuit is equipped with a non-polarized rectifier, so that even if a reverse voltage is applied to at least one of the first light-emitting circuit and the second light-emitting circuit, a drive current can be passed through the LED light source. Therefore, normal operation is guaranteed regardless of whether the vehicle is a general-purpose vehicle or a special vehicle. In addition, since a stop/tail lamp equipped with a highly versatile vehicle bulb can be provided in this way, excessive cost increases are not incurred.

According to the present invention, even if a polarized element is included in the first light-emitting circuit or the second light-emitting circuit, normal operation is guaranteed in both general-purpose and special-purpose vehicle models, and a wedge-type vehicle bulb that is highly versatile and does not result in excessive cost increases can be provided. The present invention also provides a stop/tail lamp equipped with the wedge-type vehicle bulb.

FIG. 2 is a circuit diagram of a vehicle valve according to the embodiment. FIG. 4 is a circuit diagram for explaining the operation of the vehicle bulb according to the present embodiment when it is inserted into a socket portion of a general vehicle model. FIG. 4 is a circuit diagram for explaining the operation of the vehicle bulb according to the present embodiment when it is inserted into a socket portion of a special vehicle model. 1A and 1B are front and bottom views of a conventional vehicle valve. Schematic plan views of socket portions of general vehicle types and special vehicle types.

The stop/tail lamp and vehicle bulb according to one embodiment of the present invention will be described in detail below with reference to the drawings. The stop/tail lamp 10 according to this embodiment includes a vehicle bulb 20, which will be described later, and a socket portion into which the vehicle bulb 20 is inserted. First, the configuration (particularly the circuit configuration) of the vehicle bulb 20 according to this embodiment will be described with reference to FIG. 1. Here, FIG. 1 is a circuit diagram of the vehicle bulb 20.

The vehicle bulb 20 is a wedge-type vehicle bulb for use as a stop/tail lamp. That is, the vehicle bulb 20 includes an LED light source 30, and also includes a substantially flat base portion 40 that extends downward from a main body portion that houses the LED light source 30 and various circuits (circuit board, etc.). Note that the embodiment shown in FIG. 1 includes two LED light sources 30 connected in series, but the number of LED light sources is not limited to this. In addition, the connection form of the LED light sources is not limited to this, and for example, multiple LED groups each having multiple LED light sources 30 connected in series may be connected in parallel.

The base portion 40 is provided with terminals 41-44 (terminals corresponding to the terminals 121-124 described above) of the LED light-emitting circuit (the first light-emitting circuit for emitting stop light and the second light-emitting circuit for emitting tail light, which will be described later) disposed within the vehicle bulb 20. In this embodiment, the terminals are terminals (terminals 41, 44) of the first light-emitting circuit (stop light-emitting circuit) and terminals (terminals 42, 43) of the second light-emitting circuit (tail light-emitting circuit).

The socket portion of the stop/tail lamp 10 also has a joint portion recessed for inserting the base portion 40 of the vehicle bulb 20. The inner surface (inner bottom surface) of the joint portion is provided with terminals (contact points) that are electrically connected to, for example, the vehicle battery and connect to the terminals 41, 44 of the first light-emitting circuit and the terminals 42, 43 of the second light-emitting circuit. The socket portion in this embodiment has four terminals (terminals corresponding to the output terminals 71-74, 81-84 of the socket portion described above). Each of the four terminals is arranged so that it can be connected to the terminals 41, 44 of the first light-emitting circuit and the terminals 42, 43 of the second light-emitting circuit.

Next, the vehicle bulb 20 further includes a first light-emitting circuit that causes the LED light source 30 to emit a stop light, and a second light-emitting circuit that causes the LED light source 30 to emit a tail light. As shown in FIG. 1, the first light-emitting circuit of this embodiment includes the LED light source 30 and a reverse voltage protection unit 50 in addition to the terminals 41 and 44 described above.

The reverse voltage protection unit 50 is exemplified by a diode 51. As shown in FIG. 1, the anode of the diode 51 is connected to the terminal 41 of the first light-emitting circuit, and the cathode is connected to the LED light source 30 via the LED current control unit. The first light-emitting circuit may also include a transient voltage protection element (Zener diode) 52 connected to the LED current control unit.

By providing the first light-emitting circuit with the diode 51 and Zener diode 52, the LED light source 30 can be effectively protected from reverse voltage while maintaining a simple (low-cost) circuit configuration. However, the configuration of the reverse voltage protection unit 50 is not limited to this, and may be other elements or circuits that have a rectifying effect (for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or a circuit that includes this).

As shown in FIG. 1, the second light-emitting circuit of this embodiment includes, in addition to the terminals 42 and 43 described above, an LED light source 30 and a non-polarized rectifier 60. An example of the non-polarized rectifier 60 is a bridge diode 60 connected to the terminals 42 and 43 of the second light-emitting circuit.

By providing a bridge diode 60 in the second light-emitting circuit, even if the terminals 42 and 43 of the second light-emitting circuit are connected inversely to the respective terminals in the socket section (when the terminal 42 of the second light-emitting circuit is connected to the secondary line positive terminal of the socket section and the terminal 43 of the second light-emitting circuit is connected to the secondary line negative terminal of the socket section), the LED light source 30 can emit tail light.

However, the form of the non-polarized rectifier 60 is not limited to this, and may be other elements or circuits having a non-polarized rectification function. However, when the non-polarized rectifier is a bridge diode 60, the bridge diode 60 includes a diode having a rectification function by itself, and therefore can reduce the voltage that may be applied to the LED light source 30. In addition, the bridge diode 60 has a simple circuit configuration, and is preferable in that it does not lead to an increase in costs. The Zener diode 52 also functions as a protective element when a reverse voltage (negative transient voltage, etc.) is applied to the LED light source 30 from the terminals 42 and 43 of the second light-emitting circuit.

Next, the operation of the first light-emitting circuit and the second light-emitting circuit in the vehicle bulb 20 will be described with reference to Figures 2 and 3. Here, Figure 2 is a circuit diagram for explaining the operation when the vehicle bulb 20 (base part 40) is inserted into the socket part of a general vehicle model. Also, Figure 3 is a circuit diagram for explaining the operation when the vehicle bulb 20 (base part 40) is inserted into the socket part of a special vehicle model.

First, referring to FIG. 2, the operation when the vehicle bulb 20 is inserted into the socket of a general vehicle model will be described. The terminals in the socket (general vehicle model) are arranged from the top of FIG. 2 as follows: main line positive terminal 71, sub line positive terminal 72, sub line negative terminal 73, and main line negative terminal 74 (this arrangement corresponds to the terminal arrangement in FIG. 5(a)). At this time, the terminals of the socket (general vehicle model) and the terminals of the first light-emitting circuit and the second light-emitting circuit in the vehicle bulb 20 are connected as shown in FIG. 2.

That is,
(1) The main line positive terminal 71 and the terminal 41 of the first light-emitting circuit are connected.
(2) The secondary line positive terminal 72 and the terminal 42 of the second light-emitting circuit are connected.
(3) The secondary negative terminal 73 and the terminal 43 of the second light-emitting circuit are connected.
(4) The main line negative terminal 74 and the terminal 44 of the first light-emitting circuit are connected.
The main line positive terminal 71 and the sub line positive terminal 72 are terminals connected to the positive electrode side of the vehicle battery. The main line negative terminal 74 and the sub line negative terminal 73 are terminals connected to the negative electrode side of the vehicle battery. Description of the vehicle side lamp switches between them will be omitted.

When the vehicle bulb 20 is inserted into the socket of a general vehicle model, this connection between the terminals of the socket and the terminals of the first and second light-emitting circuits may be referred to as the "normal" connection.

At this time, the current of the first light-emitting circuit flows from terminal 41 through diode 51 and the LED current control unit to the LED light source 30 as indicated by the reference symbol C11. Then, the current flows to terminal 44 as indicated by C12, and the stop light is emitted.

The current of the second light-emitting circuit also flows through the bridge diode 60 to the LED light source 30 side as indicated by reference symbol C21, and also flows through the bridge diode 60 to the terminal 43 as indicated by reference symbol C22. This causes a drive current to flow through the LED light source 30, causing the tail light to be emitted.

When the base portion 40 of the vehicle bulb 20 is inserted in the socket portion (general vehicle model) in the opposite direction, the vehicle bulb 20 can be rotated 180 degrees to properly connect the terminals of the socket portion to the terminals of the first light-emitting circuit and the second light-emitting circuit. This causes the LED light source 30 to emit stop light and tail light.

Next, referring to Figure 3, the operation when the vehicle bulb 20 (base portion 40) is inserted into the socket portion of a special vehicle model will be described. The terminals in the socket portion (special vehicle model) are arranged from the top of Figure 3 as follows: main line positive terminal 81, sub line negative terminal 82, sub line positive terminal 83, and main line negative terminal 84 (this arrangement corresponds to the terminal arrangement in Figure 5 (b)). Here, the terminals of the socket portion (special vehicle model) and the terminals of the first light-emitting circuit and the second light-emitting circuit are connected as shown in Figure 3.

That is,
(1) The main line positive terminal 81 and the terminal 41 of the first light-emitting circuit are connected.
(2) The secondary negative terminal 82 and the terminal 42 of the second light-emitting circuit are connected.
(3) The secondary line positive terminal 83 and the terminal 43 of the second light-emitting circuit are connected.
(4) The main line negative terminal 84 and the terminal 44 of the first light-emitting circuit are connected.
The main line positive terminal 81 and the sub line positive terminal 83 are terminals connected to the positive electrode side of the vehicle battery, while the main line negative terminal 82 and the sub line negative terminal 84 are terminals connected to the negative electrode side of the vehicle battery.

When the vehicle bulb 20 is inserted into the socket of a special vehicle model, this connection between the terminals of the socket and the terminals of the first and second light-emitting circuits may be referred to as the "normal" connection.

At this time, the current of the first light-emitting circuit flows from terminal 41 through diode 51 and the LED current control unit to the LED light source 30 as indicated by reference symbol C31, and also flows to terminal 44 as indicated by reference symbol C32. This causes a drive current to flow through the LED light source 30, causing the stop light to be emitted.

In addition, the current of the second light-emitting circuit flows from the terminal 43 through the bridge diode 60 to the LED light source 30 side as indicated by the reference symbol C41, and also flows through the bridge diode 60 to the terminal 42 as indicated by the reference symbol C42. This causes a drive current to flow to the LED light source 30, causing the tail light to be emitted. That is, in the second light-emitting circuit, the bridge diode 60 causes a current to flow to the LED light source 30 regardless of the direction of the applied voltage (current).

According to the first light-emitting circuit and the second light-emitting circuit of this embodiment, the LED light source 30 can emit stop light and tail light even when the vehicle bulb 20 is inserted into the socket of both a general vehicle model and a special vehicle model. This makes it possible to provide a vehicle bulb 20 that is highly versatile and does not incur excessive cost increases.

If the base portion 40 of the vehicle bulb 20 is inserted in the socket portion (special vehicle model) in the opposite direction, the vehicle bulb 20 can be rotated 180 degrees to properly connect the terminals of the socket portion to the terminals of the first light-emitting circuit and the second light-emitting circuit.

However, the configuration of the vehicle bulb 20 is not limited to the above. As an example of another configuration, the first light-emitting circuit and the second light-emitting circuit may both include a non-polarized rectifier (e.g., a bridge diode). Also, the first light-emitting circuit may include a non-polarized rectifier (e.g., a bridge diode), and the second light-emitting circuit may include a reverse voltage protection unit (e.g., at least one diode).

However, in an embodiment in which both the first light-emitting circuit and the second light-emitting circuit have a non-polarized rectifier, the risk of damage to the LED light source 30 due to application of a negative high voltage increases because neither the first light-emitting circuit nor the second light-emitting circuit has a reverse voltage protection function (e.g., a diode). In this regard, the above-mentioned embodiment (the embodiment in which the first light-emitting circuit has a reverse voltage protection unit and the second light-emitting circuit has a non-polarized rectifier) is preferable to this embodiment (the embodiment in which both the first light-emitting circuit and the second light-emitting circuit have a non-polarized rectifier).

In addition, in the embodiment in which the first light-emitting circuit includes a non-polarized rectifier and the second light-emitting circuit includes a reverse voltage protection unit, the first light-emitting circuit for emitting the stop light, which is used for a long time (high frequency of use), does not include a reverse voltage protection unit. Therefore, compared to the above-mentioned embodiment (in which the first light-emitting circuit includes a reverse voltage protection unit and the second light-emitting circuit includes a non-polarized rectifier), there is a higher risk of damage to the LED light source 30 due to reverse voltage. In this regard, the above-mentioned embodiment (in which the first light-emitting circuit includes a reverse voltage protection unit and the second light-emitting circuit includes a non-polarized rectifier) is preferable to the embodiment (in which the first light-emitting circuit includes a non-polarized rectifier and the second light-emitting circuit includes a reverse voltage protection unit).

In contrast, in this embodiment (the embodiment in which the first light-emitting circuit includes a non-polarized rectifier and the second light-emitting circuit includes a reverse voltage protection unit), when the vehicle bulb 20 is inserted into the socket in the reverse direction, the tail light is not emitted, but the stop light is emitted. That is, in this embodiment (the embodiment in which the first light-emitting circuit includes a non-polarized rectifier and the second light-emitting circuit includes a reverse voltage protection unit), the stop light that is emitted when the user presses the brake pedal is emitted regardless of the insertion state of the vehicle bulb 20. Therefore, the task of checking whether the vehicle bulb 20 is inserted into the socket properly can be performed by checking whether the tail light that is visible is turned on or off without the user's action (e.g., pressing the brake pedal). Therefore, the user can check whether the vehicle bulb 20 is inserted into the socket properly by himself. In this respect, this embodiment is preferable to the above-mentioned embodiment (the embodiment in which the first light-emitting circuit includes a reverse voltage protection unit and the second light-emitting circuit includes a non-polarized rectifier).

The vehicle bulb 20 illustrated may also include other circuits, such as a light switching circuit that switches the main light emission from the tail light to the stop light based on the input of a stop signal (a signal obtained by pressing the brake pedal).

The above describes the embodiments of the present invention in detail. However, the above description is provided to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention may include things that can be modified or improved without departing from the spirit of the present invention. The present invention also includes equivalents thereof.

10... Stop/tail lamp 20... Vehicle bulb 30... LED light source 40... Base portion 41, 44... Terminal of first light-emitting circuit 42, 43... Terminal of second light-emitting circuit 51... Diode 52... Zener diode 60... Bridge diode 71-74... Each terminal of the socket portion in a general vehicle 81-84... Each terminal of the socket portion in a special vehicle

Claims (4)

A main body including an LED light source, a first light emitting circuit that causes the LED light source to emit a stop light, and a second light emitting circuit that causes the LED light source to emit a tail light;
A substantially flat base portion extending from the main body portion;
Equipped with
At least one of the first light-emitting circuit and the second light-emitting circuit includes a non-polarizing rectifier,
the other of the first light-emitting circuit and the second light-emitting circuit includes a reverse voltage protection unit ,
the base portion includes two terminals connected to the first light-emitting circuit and two terminals connected to the second light-emitting circuit,
the two terminals of the first light-emitting circuit are disposed on each side surface of the base portion outside the two terminals of the second light-emitting circuit and in point-symmetric positions with respect to the center of the base portion;
The two terminals of the second light-emitting circuit are disposed on each side of the base portion closer to the center than the terminals of the first light-emitting circuit, and in point-symmetric positions with respect to the center of the base portion . A main body including an LED light source, a first light emitting circuit that causes the LED light source to emit a stop light, and a second light emitting circuit that causes the LED light source to emit a tail light;
A substantially flat base portion extending from the main body portion;
Equipped with
The first light-emitting circuit includes a reverse voltage protection unit,
the second light-emitting circuit includes a non-polarizing rectifier;
the base portion includes two terminals connected to the first light-emitting circuit and two terminals connected to the second light-emitting circuit,
the two terminals of the first light-emitting circuit are disposed on each side surface of the base portion outside the two terminals of the second light-emitting circuit and in point-symmetric positions with respect to the center of the base portion;
The two terminals of the second light-emitting circuit are disposed on each side of the base portion closer to the center than the terminals of the first light-emitting circuit, and in point-symmetric positions with respect to the center of the base portion . The first light-emitting circuit includes a reverse voltage protection unit,
The wedge-type vehicle bulb according to claim 1 , wherein the second light-emitting circuit comprises a non-polarizing rectifier. A stop/tail lamp comprising the wedge-type vehicle bulb according to any one of claims 1 to 3.