JP7319591B2 - Vehicle lighting device and vehicle lamp - Google Patents

Description

TECHNICAL FIELD Embodiments of the present invention relate to a vehicle lighting device and a vehicle lamp.

2. Description of the Related Art From the viewpoint of energy saving and long life, vehicle lighting devices equipped with light-emitting diodes are becoming popular instead of vehicle lighting devices equipped with filaments.
Here, the voltage (input voltage) applied to the vehicle lighting device fluctuates. For example, typically the input voltage ranges from 9V to 16V. As the input voltage decreases, the total luminous flux decreases according to the forward voltage drop across the series connected light emitting diodes. Therefore, when the input voltage drops, there is a risk that the total luminous flux of the vehicle lighting device will be less than the specified value.

Therefore, techniques have been proposed to reduce the number of light-emitting diodes to be lit when the input voltage drops. If the number of light-emitting diodes to be lit is reduced, the voltage drop in the forward direction is reduced, so that the required total luminous flux can be secured.
However, simply reducing the number of light-emitting diodes to be lit may significantly change the light distribution characteristics (for example, the irradiation range) of the vehicle lighting device.
Therefore, it has been desired to develop a technique capable of suppressing changes in light distribution characteristics that occur when the number of light-emitting diodes to be lit is reduced.

JP 2015-63252 A

A problem to be solved by the present invention is to provide a vehicle lighting device and a vehicle lamp that can suppress changes in light distribution characteristics that occur when the number of light emitting elements to be lit is reduced.

A vehicle lighting device according to an embodiment includes: a socket; a substrate provided on one end side of the socket; five or more light emitting elements provided on the substrate; a controller configured to reduce the number of the light-emitting elements to be lit when When viewed in a direction along the central axis of the vehicle lighting device, the control unit includes a first light emitting element provided at a position overlapping the central axis, and a first light emitting element provided across the central axis, A pair of second light emitting elements having the same distance from the central axis can be turned off.

According to the embodiments of the present invention, it is possible to provide a vehicle lighting device and a vehicle lamp that can suppress changes in light distribution characteristics that occur when the number of light-emitting elements to be lit is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view for illustrating the vehicle lighting apparatus which concerns on this Embodiment. FIG. 2 is a schematic cross-sectional view of the vehicle lighting device in FIG. 1 taken along the line AA. 4 is a circuit diagram of a light emitting module; FIG. (a) is a schematic plan view for illustrating a state in which three light-emitting elements are lit. (b) is a schematic side view for illustrating a state in which three light emitting elements are lit; (a) is a schematic plan view for illustrating the form of the lighting state or the form of the extinguishing state according to the comparative example. (b) is a schematic side view for illustrating the form of the lighting state or the form of the extinguishing state according to the comparative example. (a) is a schematic plan view for illustrating the form of the lighting state or the form of the extinguishing state according to the present embodiment. (b) is a schematic side view for illustrating the form of the lighting state or the form of the extinguishing state according to the present embodiment. (a) is a schematic plan view for illustrating the form of the lighting state or the form of the extinguishing state according to another embodiment. (b) is a schematic side view for illustrating the form of the lighting state or the form of the extinguishing state according to another embodiment. (a), (b) is a schematic plan view for illustrating the form of the lighting state which concerns on other embodiment, or the form of an extinction state. (a) to (e) are schematic plan views for exemplifying the form of the lighting state and the form of the extinguishing state according to other embodiments. (a) to (f) are schematic plan views for exemplifying the form of the lighting state and the form of the extinguishing state according to other embodiments. (a) to (f) are schematic plan views for exemplifying the form of the lighting state and the form of the extinguishing state according to other embodiments. (a) to (e) are schematic plan views for exemplifying the form of the lighting state and the form of the extinguishing state according to other embodiments. (a), (b) is a schematic plan view for illustrating the form of the lighting state which concerns on other embodiment, or the form of an extinction state. 1 is a schematic partial cross-sectional view for illustrating a vehicle lamp; FIG.

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.

(Vehicle lighting device)
The vehicle lighting device 1 according to the present embodiment can be installed in, for example, an automobile or a railroad vehicle. The vehicle lighting device 1 provided in an automobile includes, for example, a front combination light (for example, a combination of a daytime running lamp (DRL), a position lamp, a turn signal lamp, etc.) and a rear combination light. Examples include those used for lights (for example, an appropriate combination of stop lamps, tail lamps, turn signal lamps, back lamps, fog lamps, etc.). However, the applications of the vehicle lighting device 1 are not limited to these.

FIG. 1 is a schematic perspective view for illustrating a vehicle lighting device 1 according to this embodiment.
FIG. 2 is a schematic cross-sectional view of the vehicle lighting device 1 in FIG. 1 taken along the line AA.
As shown in FIGS. 1 and 2 , the vehicle lighting device 1 can be provided with a socket 10 , a light emitting module 20 and a power supply section 30 .

The socket 10 can have a mounting portion 11 , a bayonet 12 , a flange 13 and heat radiating fins 14 .
The mounting portion 11 can be provided on the surface of the flange 13 opposite to the side on which the radiation fins 14 are provided. The external shape of the mounting portion 11 can be columnar. The external shape of the mounting portion 11 is, for example, a cylindrical shape. The mounting portion 11 can have a concave portion 11a opening at the end portion opposite to the flange 13 side.

The bayonet 12 can be provided on the outer surface of the mounting portion 11 . For example, the bayonet 12 protrudes outward from the vehicle lighting device 1 . Bayonet 12 can be opposed to flange 13 . A plurality of bayonet 12 can be provided. The bayonet 12 can be used when mounting the vehicle lighting device 1 to the housing 101 of the vehicle lamp 100 . Bayonet 12 can be used for twist locks.

The flange 13 can have a plate shape. For example, the flange 13 can be disc-shaped. The outer surface of the flange 13 can be positioned further outside the vehicle lighting device 1 than the outer surface of the bayonet 12 .

The radiation fins 14 can be provided on the side of the flange 13 opposite to the side of the mounting portion 11 . At least one radiation fin 14 can be provided. For example, the socket 10 illustrated in FIGS. 1 and 2 is provided with a plurality of radiating fins 14 . A plurality of radiation fins 14 can be arranged side by side in a predetermined direction. The radiation fins 14 can be plate-shaped.

Further, the socket 10 can be provided with a hole 10b into which the connector 105 is inserted. A connector 105 having a sealing member 105a can be inserted into the hole 10b. Therefore, the cross-sectional shape and cross-sectional dimensions of the hole 10b can be adapted to the cross-sectional shape and cross-sectional dimensions of the connector 105 having the seal member 105a.

The socket 10 can have a function of holding the light-emitting module 20 and the power supply section 30 and a function of transmitting heat generated in the light-emitting module 20 to the outside. Therefore, the socket 10 is preferably made of a material with high thermal conductivity, such as metal.
Moreover, in recent years, it is desired that the socket 10 can efficiently dissipate the heat generated in the light emitting module 20 and be lightweight. Therefore, it is more preferable to form the socket 10 from a highly thermally conductive resin. The highly thermally conductive resin includes, for example, a resin and a filler using an inorganic material. The high thermal conductive resin can be, for example, a resin such as PET (polyethylene terephthalate) or nylon mixed with a filler using carbon, aluminum oxide, or the like.

If the socket 10 includes a highly thermally conductive resin and the mounting portion 11, the bayonet 12, the flange 13, and the heat radiation fins 14 are integrally molded, the heat generated in the light emitting module 20 can be efficiently radiated. Also, the weight of the socket 10 can be reduced. In this case, the mounting portion 11, the bayonet 12, the flange 13, and the heat radiating fins 14 can be integrally molded using an injection molding method or the like. Alternatively, the socket 10 and the power supply portion 30 can be integrally molded using an insert molding method or the like.

The light emitting module 20 (substrate 21) can be adhered to the bottom surface 11a1 of the recess 11a, for example. The adhesive for bonding the light emitting module 20 is preferably an adhesive with high thermal conductivity. For example, the adhesive can be an adhesive mixed with a filler using an inorganic material. The thermal conductivity of the adhesive can be, for example, 0.5 W/(m·K) or more and 10 W/(m·K) or less. A heat transfer plate containing metal may be provided between the light emitting module 20 (substrate 21) and the socket 10. FIG.

The light emitting module 20 can be provided with a substrate 21 , a light emitting element 22 , a resistor 23 , a diode 24 and a controller 25 .
The substrate 21 may have a plate shape. The planar shape of the substrate 21 can be, for example, a square. The substrate 21 can be 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. Alternatively, the substrate 21 may be a metal plate whose surface is covered with an insulating material. When the surface of the metal plate is covered with an insulating material, the insulating material may contain an organic material or an inorganic material. When the amount of heat generated by the light emitting element 22 is large, it is preferable to form the substrate 21 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, highly thermally conductive resins, and metal plates coated with an insulating material. Further, the substrate 21 may have a single layer structure or may have a multilayer structure.

Also, a wiring pattern 21 a can be provided on the surface of the substrate 21 . The wiring pattern 21a can be formed of, for example, a material containing silver as a main component, or a material containing copper as a main component.

The light emitting element 22 can be provided on the side of the substrate 21 opposite to the side of the bottom surface 11a1 of the recess 11a. Three or more light emitting elements 22 can be provided. The light emitting elements 22 can be connected in series. Also, the light emitting element 22 can be connected in series with the resistor 23 .

The light emitting element 22 can be, for example, a light emitting diode, an organic light emitting diode, a laser diode, or the like.
The light-emitting element 22 can be, for example, a surface-mounted light-emitting element such as a PLCC (Plastic Leaded Chip Carrier) type. The light-emitting element 22 may be, for example, a bullet-shaped light-emitting element having a lead wire. The light-emitting element 22 illustrated in FIG. 1 is a surface-mounted light-emitting element.

Also, the light emitting element 22 may be mounted by a COB (Chip On Board). When the light-emitting element 22 is mounted by COB, the chip-shaped light-emitting element 22, the wiring electrically connecting the light-emitting element 22 and the wiring pattern 21a, and the frame-shaped member surrounding the light-emitting element 22 and the wiring. Then, a sealing portion or the like provided inside the frame-shaped member can be provided on the substrate 21 . In this case, the frame-shaped member can have a function of defining the formation range of the sealing portion and a function of a reflector. Also, the sealing portion can contain a phosphor. The phosphor can be, for example, a YAG-based phosphor (yttrium-aluminum-garnet-based phosphor). Note that it is also possible to provide only the sealing portion without providing the frame-shaped member. When only the sealing portion is provided, a dome-shaped sealing portion is provided on the substrate 21 .

A light emitting surface of the light emitting element 22 faces the front side of the vehicle lighting device 1 . The light emitting element 22 mainly emits light toward the front side of the vehicle lighting device 1 . The number, size, arrangement, and the like of the light emitting elements 22 are not limited to those illustrated, and can be appropriately changed according to the size, application, and the like of the vehicle lighting device 1 .

The resistor 23 can be provided on the side of the substrate 21 opposite to the side of the bottom surface 11a1 of the recess 11a. The resistor 23 can be electrically connected to the wiring pattern 21a. The resistor 23 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. Note that the resistor 23 illustrated in FIG. 1 is a surface mount type resistor.

The material of the film resistor can be ruthenium oxide (RuO ₂ ), for example. A film resistor can be formed using, for example, a screen printing method and a firing method. If the resistor 23 is a film-like resistor, the contact area between the resistor 23 and the substrate 21 can be increased, so heat dissipation can be improved. Also, a plurality of resistors 23 can be formed at once. Therefore, productivity can be improved. In addition, variations in the resistance values of the plurality of resistors 23 can be suppressed.

Here, since the forward voltage characteristics of the light emitting element 22 vary, if the voltage applied between the anode terminal and the ground terminal is constant, the brightness of the light emitted from the light emitting element 22 (luminous flux, luminance) , luminous intensity, and illuminance). Therefore, the value of the current flowing through the light emitting element 22 can be kept within a predetermined range by the resistor 23 so that the brightness of the light emitted from the light emitting element 22 is within a predetermined range. In this case, by changing the resistance value of the resistor 23, the value of the current flowing through the light emitting element 22 can be kept within a predetermined range.

When the resistor 23 is a surface-mounted resistor or a resistor having lead wires, the resistor 23 having an appropriate resistance value can be selected according to the forward voltage characteristics of the light emitting element 22 . If the resistor 23 is a film resistor, the resistance value can be increased by removing part of the resistor 23 . The number, size, arrangement, and the like of the resistors 23 are not limited to those illustrated, and can be appropriately changed according to the number and specifications of the light emitting elements 22 .

The diode 24 can be provided on the side of the substrate 21 opposite to the bottom surface 11a1 side of the recess 11a. The diode 24 can be electrically connected to the wiring pattern 21a. The diode 24 can be provided, for example, to prevent reverse voltage from being applied to the light emitting element 22 and to prevent pulse noise from being applied to the light emitting element 22 from the reverse direction.

The control unit 25 can be provided on the side of the substrate 21 opposite to the side of the bottom surface 11a1 of the concave portion 11a. The control unit 25 can be provided on the substrate 21 on the side of the bottom surface 11a1 of the concave portion 11a, or can be provided inside the socket 10, the housing 101 of the vehicle lamp 100, or the like. However, if the control unit 25 is provided on the side of the substrate 21 opposite to the bottom surface 11a1 side of the recess 11a, electrical connection between the control unit 25 and the light emitting element 22 is facilitated.

The controller 25 can be electrically connected to the wiring pattern 21a. The control unit 25 changes the number of the light emitting elements 22 to be lit according to the input voltage. For example, the controller 25 can turn on all the light emitting elements 22 when the input voltage exceeds a predetermined value. For example, the control unit 25 can turn off some of the light emitting elements 22 when the input voltage becomes equal to or less than a predetermined value. That is, the control unit 25 can reduce the number of the light-emitting elements 22 to be lit when the input voltage becomes equal to or less than the predetermined value.
In this specification, the light-off state includes not only a state in which no light is emitted from the light-emitting element 22, but also a case in which a slight amount of unintended light is emitted from the light-emitting element 22 due to a slight current flowing through the light-emitting element 22. shall include
Details of the action of the control unit 25 will be described later.

The power feeding portion 30 can have a power feeding terminal 31 and a holding portion 32 .
The power supply terminal 31 can be a rod-shaped body. The power supply terminal 31 can protrude from the bottom surface 11a1 of the recess 11a. A plurality of power supply terminals 31 can be provided. A plurality of power supply terminals 31 can be arranged side by side in a predetermined direction. A plurality of power supply terminals 31 extend inside the holding portion 32 . The ends of the plurality of power supply terminals 31 on the side of the light emitting module 20 can be soldered to the wiring pattern 21 a provided on the substrate 21 . The ends of the plurality of power supply terminals 31 on the side of the radiation fins 14 can be exposed inside the holes 10 b of the socket 10 . A connector 105 can be fitted to the plurality of power supply terminals 31 exposed inside the hole 10b. The power supply terminal 31 can be made of metal such as copper alloy, for example. Note that the number, shape, arrangement, material, etc. of the power supply terminals 31 are not limited to those illustrated, and can be changed as appropriate.

As previously mentioned, socket 10 is preferably formed from a material with high thermal conductivity. However, materials with high thermal conductivity may have electrical conductivity. For example, a highly thermally conductive resin using a filler containing carbon has electrical conductivity. Therefore, the holding portion 32 can be provided to insulate between the power supply terminal 31 and the conductive socket 10 . The holding portion 32 can also have a function of holding the plurality of power supply terminals 31 . Note that if the socket 10 is made of an insulating, highly thermally conductive resin (for example, a highly thermally conductive resin using a filler containing aluminum oxide), the holding portion 32 can be omitted. In this case, the socket 10 can hold multiple power supply terminals 31 .

The holding portion 32 can be made of an insulating resin. For example, the holding portion 32 can be press-fitted into the hole 10a provided in the socket 10 or adhered to the inner wall of the hole 10a.

Next, the action of the control section 25 will be further described.
Although the vehicle lighting device 1 uses a battery as a power source, the voltage (input voltage) applied to the vehicle lighting device 1 may fluctuate. For example, the operating standard voltage (rated voltage) of the vehicle lighting device 1 for general automobiles is about 13.5V. However, the input voltage may fluctuate due to the voltage drop of the battery, the operation of the alternator, the influence of the circuit, etc. Therefore, the operating voltage range (voltage fluctuation range) is defined in the vehicle lighting device 1 for automobiles. For example, the operating voltage range is generally from 9V to 16V, and in some cases from 7V to 16V.

Also, the light emitting element 22 has a forward voltage drop. Therefore, when the input voltage of the plurality of light emitting elements 22 connected in series decreases, the amount of light emitted from the plurality of light emitting elements 22 decreases. In the vicinity of the lower limit of the operating voltage range, the total luminous flux of the vehicle lighting device 1 may be less than the specified value. For example, if the forward voltage drop of the light emitting element 22 is about 3V, connecting three light emitting elements 22 in series results in a voltage drop of 9V. A resistor 23 is also connected in series to the three light emitting elements 22 . Therefore, when the input voltage is approximately 9 V, almost no current flows through the three light emitting elements 22, and the total luminous flux of the vehicle lighting device 1 becomes less than the specified value.

FIG. 3 is a circuit diagram of the light emitting module 20. As shown in FIG.
As shown in FIG. 3, the light emitting module 20 is provided with three light emitting elements 22, a resistor 23, a diode 24, and a control section 25. FIG.
Three light emitting elements 22, resistors 23, and diodes 24 are connected in series.
The controller 25 can have a voltmeter 25a and a switch 25b. The voltmeter 25a can detect the input voltage. The switch 25b can be connected in parallel with the one light-emitting element 22 farthest to the input side.

The control unit 25 can open the switch 25b when the input voltage detected by the voltmeter 25a exceeds a predetermined value. When the switch 25b is open, the current Ia flows through the three light emitting elements 22 connected in series, and the three light emitting elements 22 emit light. On the other hand, the control section 25 can close the switch 25b when the input voltage detected by the voltmeter 25a is equal to or less than a predetermined value. When the switch 25b is closed, the current Ib flows through the two light emitting elements 22 connected in series, and almost no current flows through the light emitting element 22 connected in parallel with the switch 25b. Therefore, the forward voltage drop is reduced by the amount of one light emitting element 22 through which almost no current flows, so that the current flowing through the remaining two light emitting elements 22 can be increased. As a result, in the vicinity of the lower limit of the operating voltage range, it is possible to prevent the total luminous flux of the vehicle lighting device 1 from becoming less than the specified value.

In the above, the controller 25 having the voltmeter 25a and the switch 25b was exemplified. good. For example, the control unit 25 may have an input voltage determination circuit using a Zener diode (constant voltage diode), a comparator using an operational amplifier, or the like, and may have a circuit for detecting the input voltage. good. Further, for example, the control unit 25 may include a CPU (Central Processing Unit), a storage device, etc., and change the number of the light emitting elements 22 to which voltage is applied according to the detected input voltage. In this case, the control can be executed according to a program stored in the storage device.
In addition, below, the case where lighting and light extinction are switched by switch 25b is demonstrated as an example.

As described above, by changing the number of light emitting elements 22 to which voltage is applied according to the input voltage, a predetermined total luminous flux can be obtained even near the lower limit of the operating voltage range.
However, depending on the arrangement position of the light emitting element 22 to be extinguished among the plurality of light emitting elements 22, the light distribution characteristics (for example, the irradiation range) of the vehicle lighting device 1 may change significantly before and after switching by the switch 25b. be.

FIG. 4(a) is a schematic plan view illustrating a state in which the three light emitting elements 22a to 22c are lit.
FIG. 4(b) is a schematic side view illustrating a state in which the three light emitting elements 22a to 22c are lit.
As shown in FIGS. 4A and 4B, the three light emitting elements 22a to 22c are arranged side by side in one direction. When viewed from the direction along the central axis 1a of the vehicle lighting device 1, the light emitting element 22a is provided at a position overlapping the central axis 1a.

In this specification, the position overlapping the central axis 1a is not limited to the case where the center of the light emitting surface of the light emitting element 22 overlaps with the central axis 1a, but also the case where the central axis 1a is inside the light emitting surface. shall also include

Also, the light emitting elements 22b and 22c can be provided at positions that are point symmetrical with respect to the center axis 1a. In this specification, the point-symmetrical position is not limited to the case where the center of the light-emitting element 22 is at a point-symmetrical position. A misaligned position is also acceptable.

4A and 4B are cases where the input voltage exceeds a predetermined value. For example, this is the case when the switch 25b mentioned above is open. In this case, since light is emitted from the three light emitting elements 22a to 22c, the light distribution characteristic of the vehicle lighting device 1 is wide in the direction in which the three light emitting elements 22a to 22c are arranged. It becomes narrower in the direction perpendicular to the direction in which it is arranged.

FIG. 5A is a schematic plan view for illustrating the form of the lighting state or the form of the non-lighting state according to the comparative example.
FIG. 5(b) is a schematic side view for illustrating the form of the lighting state or the form of the non-lighting state according to the comparative example.
5(a) and 5(b) show the case where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed. In this case, the two light emitting elements 22a and 22c are turned on and the one light emitting element 22b is turned off. For example, this is the case where the light emitting element 22b is connected in parallel with the switch 25b.

By doing so, a predetermined total luminous flux can be obtained even near the lower limit of the operating voltage range. However, as shown in FIG. 5B, the light distribution characteristic of the vehicle lighting device 1 is biased toward the light emitting element 22c. Therefore, the light distribution characteristics of the vehicle lighting device 1 change significantly before and after switching by the switch 25b, and the driver and the like tend to feel uncomfortable.

FIG. 6(a) is a schematic plan view for illustrating the form of the lighting state or the form of the extinguishing state according to the present embodiment.
FIG. 6B is a schematic side view for illustrating the form of the lighting state or the form of the extinguishing state according to the present embodiment.
6A and 6B are cases where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed. In this case, the two light emitting elements 22b and 22c are turned on and the one light emitting element 22a is turned off. For example, this is the case where the light emitting element 22a is connected in parallel with the switch 25b.

As described above, the light emitting elements 22b and 22c are provided at points symmetrical with respect to the central axis 1a. Therefore, as shown in FIG. It is possible to suppress a significant change in the light distribution characteristics of the illumination device 1 for use.

FIG. 7A is a schematic plan view for illustrating the form of the lighting state or the form of the extinguishing state according to another embodiment.
FIG. 7B is a schematic side view for illustrating the form of the lighting state or the form of the extinguishing state according to another embodiment.
FIGS. 7A and 7B are cases where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed. In this case, one light emitting element 22a is turned on and the two light emitting elements 22b and 22c are turned off. For example, the light emitting elements 22b and 22c connected in series are connected in parallel with the switch 25b.

As described above, since the light emitting element 22a is provided at the position of the central axis 1a, as shown in FIG. change can be suppressed.

In this case, the form of the lighting state or the form of the extinguished state illustrated in FIGS. 6A and 6B and the form of the lighting state or the form of the extinguished state illustrated in FIGS. Then, the light distribution characteristics are different. Therefore, the form of the lighting state or the form of the extinguished state can be selected according to the application of the vehicle lighting device 1 or the like. For example, in applications in which a wide light distribution characteristic in the horizontal direction is desirable, it is possible to select the form of the lit state or the form of the extinguished state illustrated in FIGS. For example, in applications in which the light distribution characteristic of a point light source is preferable, the lighting state form or the extinguishing state form illustrated in FIGS. 7A and 7B can be selected.

FIGS. 8(a) and 8(b) are schematic plan views for illustrating the form of the lighting state and the form of the extinguishing state according to another embodiment.
8A and 8B show the case where four light emitting elements 22a1, 22b to 22d are arranged side by side in one direction. The light emitting elements 22a1 and 22c can be provided at positions that are point symmetrical with respect to the center axis 1a. The light emitting elements 22b and 22d can be provided at positions that are point symmetrical with respect to the center axis 1a.

FIGS. 8A and 8B are cases where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed.
In this case, as shown in FIG. 8A, the two light emitting elements 22a1 and 22c can be turned on, and the two light emitting elements 22b and 22d can be turned off. For example, the light emitting elements 22b and 22d connected in series are connected in parallel with the switch 25b.

As described above, the light emitting elements 22a1 and 22c are provided at points symmetrical to each other with respect to the central axis 1a. change can be suppressed.

Also, as shown in FIG. 8B, the two light emitting elements 22b and 22d can be turned on and the two light emitting elements 22a1 and 22c can be turned off. For example, this is the case where the series-connected light-emitting elements 22a1 and 22c are connected in parallel with the switch 25b.

As described above, the light emitting elements 22b and 22d are provided at points symmetrical to each other with respect to the central axis 1a. change can be suppressed.

In this case, the luminous intensity distribution characteristics differ between the lighting state form and the extinguishing state form illustrated in FIGS. Therefore, the form of the lighting state or the form of the extinguished state can be selected according to the application of the vehicle lighting device 1 or the like. For example, in applications where the light distribution characteristic of a point light source is preferable, the lighting state form or the extinguishing state form illustrated in FIG. 8A can be selected. For example, in an application in which a wide light distribution characteristic in the horizontal direction is desirable, the form of the lit state or the form of the extinguished state exemplified in FIG. 8(b) can be selected.

FIGS. 9A to 9E are schematic plan views for exemplifying the form of the lighting state and the form of the extinguishing state according to another embodiment.
FIGS. 9A to 9E show the case where five light emitting elements 22a to 22e are arranged side by side in one direction. The light emitting element 22a can be provided at the position of the central axis 1a. The light emitting elements 22b and 22c can be provided at positions that are point symmetrical with respect to the center axis 1a. The light emitting elements 22d and 22e can be provided at positions that are symmetrical with each other with the center axis 1a as the center of symmetry.

FIGS. 9A to 9E are cases where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed.
In this case, as shown in FIG. 9A, the three light emitting elements 22a, 22d and 22e can be turned on and the two light emitting elements 22b and 22c can be turned off. For example, the light emitting elements 22b and 22c connected in series are connected in parallel with the switch 25b.

As described above, the light-emitting element 22a is provided at the position of the central axis 1a, and the light-emitting elements 22d and 22e are provided at points symmetrical with respect to the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Also, as shown in FIG. 9B, two light emitting elements 22b and 22c can be turned on and three light emitting elements 22a, 22d and 22e can be turned off. For example, the light emitting elements 22a, 22d, and 22e connected in series are connected in parallel with the switch 25b.

As described above, the light emitting elements 22b and 22c are provided at points symmetrical to each other with respect to the central axis 1a. change can be suppressed.

Also, as shown in FIG. 9C, the three light emitting elements 22a, 22b and 22c can be lit and the two light emitting elements 22d and 22e can be extinguished. For example, this is the case where the series-connected light-emitting elements 22d and 22e are connected in parallel with the switch 25b.

As described above, the light emitting element 22a is provided at the position of the central axis 1a, and the light emitting elements 22b and 22c are provided at points symmetrical with respect to the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Also, as shown in FIG. 9D, two light emitting elements 22d and 22e can be turned on, and three light emitting elements 22a, 22b and 22c can be turned off. For example, the light emitting elements 22a, 22b, and 22c connected in series are connected in parallel with the switch 25b.

As described above, the light emitting elements 22d and 22e are provided at points symmetrical to each other with respect to the central axis 1a. change can be suppressed.

Also, as shown in FIG. 9(e), one light emitting element 22a can be turned on and four light emitting elements 22b, 22c, 22d, and 22e can be turned off. For example, the series-connected light-emitting elements 22b, 22c, 22d, and 22e are connected in parallel with the switch 25b.

As described above, since the light emitting element 22a is provided at the position of the central axis 1a, it is possible to suppress a significant change in the light distribution characteristics of the vehicle lighting device 1 before and after switching by the switch 25b.

In this case, the luminous intensity distribution characteristics differ between the lighting state form and the extinguished state form illustrated in FIGS. 9A to 9E. Therefore, the form of the lighting state or the form of the extinguished state can be selected according to the application of the vehicle lighting device 1 or the like. For example, in applications where the luminous intensity distribution characteristic of a point light source is preferable, it is possible to select the form of the lit state or the form of the extinguished state illustrated in FIGS. It is also possible to select the form of the lighting state or the form of the extinguishing state illustrated in FIG. 9(b). For example, in applications in which a wide light distribution characteristic in the horizontal direction is desirable, it is possible to select the lighting state form or the extinguished state form illustrated in FIGS. 9(a) and (d).

Further, it is also possible to select the form of the lighting state or the form of the extinguishing state according to the value of the forward voltage drop of the light emitting element 22 or the lower limit value of the operating voltage range. For example, when the voltage drop value is large or the lower limit of the operating voltage range is small, more light emitting elements 22 can be extinguished.

FIGS. 10A to 10F are schematic plan views for exemplifying the form of the lit state and the form of the extinguished state according to other embodiments.
10A to 10F, one light emitting element 22a is provided at the position of the central axis 1a, and four light emitting elements 22b to 22e are provided at equal intervals on the circumference around the central axis 1a. is the case. The light emitting elements 22b and 22c can be provided at positions that are point symmetrical with respect to the center axis 1a. The light emitting elements 22d and 22e can be provided at positions that are symmetrical with each other with the center axis 1a as the center of symmetry.

FIGS. 10A to 10F are cases where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed.
In this case, as shown in FIG. 10(a), the three light emitting elements 22a, 22d and 22e can be turned on and the two light emitting elements 22b and 22c can be turned off. For example, the light emitting elements 22b and 22c connected in series are connected in parallel with the switch 25b.

As described above, the light-emitting element 22a is provided at the position of the central axis 1a, and the light-emitting elements 22d and 22e are provided at points symmetrical with respect to the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Also, as shown in FIG. 10B, the three light emitting elements 22a, 22b and 22c can be turned on and the two light emitting elements 22d and 22e can be turned off. For example, this is the case where the series-connected light-emitting elements 22d and 22e are connected in parallel with the switch 25b.

As described above, the light emitting element 22a is provided at the position of the central axis 1a, and the light emitting elements 22b and 22c are provided at points symmetrical with respect to the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Also, as shown in FIG. 10(c), two light emitting elements 22b and 22c can be turned on and three light emitting elements 22a, 22d and 22e can be turned off. For example, the light emitting elements 22a, 22d, and 22e connected in series are connected in parallel with the switch 25b.

As described above, the light emitting elements 22b and 22c are provided at points symmetrical to each other with respect to the central axis 1a. change can be suppressed.

Also, as shown in FIG. 10(d), two light emitting elements 22d and 22e can be turned on and three light emitting elements 22a, 22b and 22c can be turned off. For example, the light emitting elements 22a, 22b, and 22c connected in series are connected in parallel with the switch 25b.

As described above, the light emitting elements 22d and 22e are provided at points symmetrical to each other with respect to the central axis 1a. change can be suppressed.

Also, as shown in FIG. 10(e), one light emitting element 22a can be turned on and four light emitting elements 22b, 22c, 22d, and 22e can be turned off. For example, the series-connected light-emitting elements 22b, 22c, 22d, and 22e are connected in parallel with the switch 25b.

As described above, since the light emitting element 22a is provided at the position of the central axis 1a, it is possible to suppress a significant change in the light distribution characteristics of the vehicle lighting device 1 before and after switching by the switch 25b.

Further, as shown in FIG. 10(f), four light emitting elements 22b, 22c, 22d, and 22e can be turned on, and one light emitting element 22a can be turned off. For example, this is the case where the light emitting element 22a is connected in parallel with the switch 25b.

As described above, the four light emitting elements 22b to 22e are provided on the circumference centered on the central axis 1a at equal intervals. Remarkable changes in characteristics can be suppressed.

In this case, the luminous intensity distribution characteristics differ between the lighting state form and the extinguished state form illustrated in FIGS. Therefore, the form of the lighting state or the form of the extinguished state can be selected according to the application of the vehicle lighting device 1 or the like. For example, in applications in which the light distribution characteristic of a point light source is preferable, the lighting state or the unlit state illustrated in FIGS. 10(e) and 10(f) can be selected. For example, in applications where a light distribution characteristic that is wide in one direction is desirable, it is possible to select the form of the lit state or the form of the extinguished state exemplified in FIGS.

Further, it is also possible to select the form of the lighting state or the form of the extinguishing state according to the value of the forward voltage drop of the light emitting element 22 or the lower limit value of the operating voltage range. For example, when the voltage drop value is large or the lower limit of the operating voltage range is small, more light emitting elements 22 can be extinguished.

FIGS. 11A to 11F are schematic plan views for exemplifying the form of the lit state and the form of the extinguished state according to other embodiments.
11(a) to (f) show the case where one light emitting element 22a is provided at the position of the central axis 1a, and five light emitting elements 22b to 22f are provided on the circumference around the central axis 1a. . Also, the light emitting elements 22b and 22c can be provided at positions that are point symmetrical with respect to the center axis 1a. Further, the light emitting elements 22d and 22e are provided with the central axis 1a interposed therebetween, and the distance between them and the central axis 1a can be the same. The light emitting elements 22d and 22f are provided with the central axis 1a interposed therebetween, and the distance between them and the central axis 1a can be the same.

FIGS. 11A to 11F are cases where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed.
In this case, as shown in FIG. 11A, five light emitting elements 22b to 22f can be lit and the light emitting element 22a can be extinguished. For example, this is the case where the light emitting element 22a is connected in parallel with the switch 25b.

As described above, the five light emitting elements 22b to 22f are provided on the circumference around the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Further, as shown in FIG. 11B, four light emitting elements 22a, 22d, 22e, and 22f can be turned on, and two light emitting elements 22b and 22c can be turned off. For example, the light emitting elements 22b and 22c connected in series are connected in parallel with the switch 25b.

As described above, the light emitting element 22a is provided at the position of the central axis 1a. The light emitting elements 22d and 22e are provided with the central axis 1a interposed therebetween, and have the same distance from the central axis 1a. The light emitting elements 22d and 22f are provided across the central axis 1a and have the same distance from the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Also, as shown in FIG. 11(c), the three light emitting elements 22d to 22f can be turned on and the three light emitting elements 22a to 22c can be turned off. For example, the light emitting elements 22a to 22c connected in series are connected in parallel with the switch 25b.

As described above, the light-emitting elements 22d and 22e are provided with the central axis 1a interposed therebetween, and have the same distance from the central axis 1a. The light emitting elements 22d and 22f are provided across the central axis 1a and have the same distance from the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Also, as shown in FIG. 11(d), two light emitting elements 22b and 22c can be turned on and four light emitting elements 22a, 22d, 22e and 22f can be turned off. For example, the series-connected light-emitting elements 22a, 22d, 22e, and 22f are connected in parallel with the switch 25b.

As described above, the light emitting elements 22b and 22c are provided at points symmetrical to each other with respect to the central axis 1a. change can be suppressed.

Also, as shown in FIG. 11(e), the three light emitting elements 22a to 22c can be turned on and the three light emitting elements 22d to 22f can be turned off. For example, this is the case where the series-connected light-emitting elements 22d to 22f are connected in parallel with the switch 25b.

As described above, the light emitting element 22a is provided at the position of the central axis 1a, and the light emitting elements 22b and 22c are provided at points symmetrical with respect to the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Also, as shown in FIG. 11(f), one light emitting element 22a can be turned on and five light emitting elements 22b to 22f can be turned off. For example, the light emitting elements 22b to 22f connected in series are connected in parallel with the switch 25b.

As described above, since the light-emitting element 22a is provided at the position of the central axis 1a, it is possible to suppress a significant change in the light distribution characteristics of the vehicle lighting device 1 before and after switching by the switch 25b.

In this case, the luminous intensity distribution characteristics differ between the lighting state form and the extinguished state form illustrated in FIGS. Therefore, the form of the lighting state or the form of the extinguished state can be selected according to the application of the vehicle lighting device 1 or the like. For example, in applications where the luminous intensity distribution characteristic of a point light source is preferable, it is possible to select the lighting state form or the extinguished state form illustrated in FIGS. For example, in applications where light distribution characteristics that are wide in one direction are desirable, the lighting state form or the extinguished state form illustrated in FIGS. 11(d) and (e) can be selected.

Further, it is also possible to select the form of the lighting state or the form of the extinguishing state according to the value of the forward voltage drop of the light emitting element 22 or the lower limit value of the operating voltage range. For example, when the voltage drop value is large or the lower limit of the operating voltage range is small, more light emitting elements 22 can be extinguished.

FIGS. 12(a) to 12(e) are schematic plan views for illustrating the form of the lighting state or the form of the extinguishing state according to another embodiment.
12A to 12E, one light emitting element 22a is provided at the position of the central axis 1a, and six light emitting elements 22b to 22g are provided at equal intervals on the circumference around the central axis 1a. is the case. The light emitting elements 22b and 22c can be provided at positions that are point symmetrical with respect to the center axis 1a. The light emitting elements 22d and 22e can be provided at positions that are symmetrical with each other with the center axis 1a as the center of symmetry. The light emitting elements 22f and 22g can be provided at positions that are point symmetrical with respect to the center axis 1a.

FIGS. 12A to 12E are cases where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed.
In this case, as shown in FIG. 12(a), the six light emitting elements 22b to 22g can be lit and the light emitting element 22a can be extinguished. For example, this is the case where the light emitting element 22a is connected in parallel with the switch 25b.

As described above, the six light emitting elements 22b to 22g are provided at regular intervals on the circumference around the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Further, as shown in FIG. 12(b), the light emitting element 22a and the four light emitting elements 22d to 22g can be turned on, and the two light emitting elements 22b and 22c can be turned off. For example, the light emitting elements 22b and 22c connected in series are connected in parallel with the switch 25b.

As described above, the light emitting element 22a is provided at the position of the central axis 1a. In addition, the light emitting elements 22d and 22e are provided at positions that are symmetrical with each other with respect to the central axis 1a. The light emitting elements 22f and 22g are provided at positions that are symmetrical with each other with the center axis 1a as the center of symmetry. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Further, as shown in FIG. 12(c), four light emitting elements 22d to 22g can be turned on and three light emitting elements 22a to 22c can be turned off. For example, the light emitting elements 22a to 22c connected in series are connected in parallel with the switch 25b.

As described above, the light emitting elements 22d and 22e are provided at positions that are symmetrical with each other with the center axis 1a as the center of symmetry. The light emitting elements 22f and 22g are provided at positions that are symmetrical with each other with the center axis 1a as the center of symmetry. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Further, as shown in FIG. 12(d), it is possible to turn on three light emitting elements 22a to 22c and turn off four light emitting elements 22d to 22g. For example, the light emitting elements 22d to 22g connected in series are connected in parallel with the switch 25b.

As described above, the light emitting element 22a is provided at the position of the central axis 1a, and the light emitting elements 22b and 22c are provided at points symmetrical with respect to the central axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

Further, as shown in FIG. 12(e), one light emitting element 22a can be turned on and six light emitting elements 22b to 22g can be turned off. For example, the series-connected light-emitting elements 22b to 22g are connected in parallel with the switch 25b.

As described above, since the light-emitting element 22a is provided at the position of the central axis 1a, it is possible to suppress a significant change in the light distribution characteristics of the vehicle lighting device 1 before and after switching by the switch 25b.

In this case, the luminous intensity distribution characteristics differ between the lighting state form and the extinguished state form illustrated in FIGS. Therefore, the form of the lighting state or the form of the extinguished state can be selected according to the application of the vehicle lighting device 1 or the like. For example, in applications where the light distribution characteristic of a point light source is preferable, the lighting state or the lighting-out state exemplified in FIGS. For example, in applications where light distribution characteristics that are wide in one direction are desirable, the lighting state form or the extinguished state form illustrated in FIG. 12(d) can be selected.

Further, it is also possible to select the form of the lighting state or the form of the extinguishing state according to the value of the forward voltage drop of the light emitting element 22 or the lower limit value of the operating voltage range. For example, when the voltage drop value is large or the lower limit of the operating voltage range is small, more light emitting elements 22 can be extinguished.

FIGS. 13(a) and 13(b) are schematic plan views for illustrating the form of the lighting state or the form of the extinguishing state according to another embodiment.
FIGS. 13A and 13B show the case where four light emitting elements 22a1, 22b to 22f are arranged in two rows and three columns. The light-emitting elements 22a1 and 22d can be provided at positions that are point-symmetrical to each other with the central axis 1a as the center of symmetry. The light-emitting elements 22b and 22f can be provided at positions that are point-symmetrical to each other with the central axis 1a as the center of symmetry. The light emitting elements 22c and 22e can be provided at positions that are symmetrical with each other with the center axis 1a as the center of symmetry.

FIGS. 13A and 13B are cases where the input voltage is below a predetermined value. For example, this is the case when the aforementioned switch 25b is closed.
In this case, as shown in FIG. 13(a), four light emitting elements 22b, 22c, 22e, and 22f can be turned on, and two light emitting elements 22a1 and 22d can be turned off. For example, this is the case where the series-connected light-emitting elements 22a1 and 22d are connected in parallel with the switch 25b.

As described above, the light emitting elements 22b and 22f are provided at points symmetrical with each other with the central axis 1a as the center of symmetry. The light emitting elements 22c and 22e are provided at positions that are symmetrical with each other about the center axis 1a. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

As shown in FIG. 13(b), two light emitting elements 22a1 and 22d can be turned on and four light emitting elements 22b, 22c, 22e and 22f can be turned off. For example, the series-connected light-emitting elements 22b, 22c, 22e, and 22f are connected in parallel with the switch 25b.

As described above, the light emitting elements 22a1 and 22d are provided at positions that are symmetrical with each other with the central axis 1a as the center of symmetry. Therefore, it is possible to prevent the light distribution characteristics of the vehicle lighting device 1 from significantly changing before and after switching by the switch 25b.

In this case, the luminous intensity distribution characteristics differ between the lighting state form and the extinguishing state form illustrated in FIGS. Therefore, the form of the lighting state or the form of the extinguished state can be selected according to the application of the vehicle lighting device 1 or the like. For example, in applications in which the light distribution characteristic of a point light source is preferable, the lighting state form or the extinguishing state form illustrated in FIG. 13(b) can be selected. For example, in applications where a wide light distribution characteristic in the horizontal direction is desirable, the lighting state form or the extinguishing state form illustrated in FIG. 13(a) can be selected.

Further, it is also possible to select the form of the lighting state or the form of the extinguishing state according to the value of the forward voltage drop of the light emitting element 22 or the lower limit value of the operating voltage range. For example, when the voltage drop value is large or the lower limit of the operating voltage range is small, more light emitting elements 22 can be extinguished.

As described above, when viewed from the direction along the central axis 1a of the vehicle lighting device 1, the control unit 22 controls the first light emitting element (e.g., light emitting element) provided at a position overlapping the central axis 1a. element 22a), or a pair of second light-emitting elements (for example, light-emitting elements 22a1, 22b to 22g) provided across the central axis 1a and having the same distance from the central axis 1a, can be turned off. be.
In this case, the pair of second light emitting elements can be provided at positions that are point symmetrical with respect to the center axis 1a.
Further, five or more light emitting elements 22 can be provided. In this case, the controller 25 can turn off the first light emitting element and the pair of second light emitting elements.
When the input voltage exceeds a predetermined value, the control section 25 can turn on all the light emitting elements 22 .

(vehicle lamp)
Next, the vehicle lamp 100 is illustrated.
In the following description, as an example, the case where the vehicle lamp 100 is a front combination light provided in an automobile will be described. However, the vehicle lamp 100 is not limited to a front combination light provided in an automobile. The vehicle lighting device 100 may be a vehicle lighting device provided in an automobile, railroad vehicle, or the like.

FIG. 14 is a schematic partial cross-sectional view for illustrating the vehicle lamp 100. As shown in FIG.
As shown in FIG. 14, the vehicle lamp 100 can be provided with a vehicle lighting device 1, a housing 101, a cover 102, an optical element portion 103, a sealing member 104, and a connector 105. FIG.

The vehicle lighting device 1 can be attached to the housing 101 . The housing 101 can hold the mounting portion 11 . The housing 101 can have a box shape with one end side open. The housing 101 can be made of, for example, a resin that does not transmit light. The bottom surface of the housing 101 can be provided with a mounting hole 101a into which a portion of the mounting portion 11 provided with the bayonet 12 is inserted. A recess into which the bayonet 12 provided on the mounting portion 11 is inserted can be provided on the peripheral edge of the attachment hole 101a. Although the case where the housing 101 is directly provided with the mounting hole 101a is illustrated, the housing 101 may be provided with a mounting member having the mounting hole 101a.

When the vehicle lighting device 1 is attached to the vehicle lamp 100, the portion of the mounting portion 11 provided with the bayonet 12 is inserted into the mounting hole 101a, and the vehicle lighting device 1 is rotated. Then, for example, the bayonet 12 is held by a fitting portion provided on the periphery of the mounting hole 101a. Such an attachment method is called a twist lock.

The cover 102 can be provided so as to close the opening of the housing 101 . The cover 102 can be made of a translucent resin or the like. The cover 102 can also have a function such as a lens.

Light emitted from the vehicle lighting device 1 enters the optical element 103 . The optical element 103 can reflect, diffuse, guide, and condense the light emitted from the vehicle lighting device 1, and form a predetermined light distribution pattern. For example, the optical element 103 illustrated in FIG. 14 is a reflector. In this case, the optical element 103 can reflect the light emitted from the vehicle lighting device 1 to form a predetermined light distribution pattern.

A seal member 104 can be provided between the flange 13 and the housing 101 . The seal member 104 may have an annular shape. The seal member 104 can be made of an elastic material such as rubber or silicone resin.

When the vehicle lighting device 1 is attached to the vehicle lamp 100 , the sealing member 104 is sandwiched between the flange 13 and the housing 101 . Therefore, the internal space of the housing 101 can be sealed by the sealing member 104 . Also, the elastic force of the seal member 104 presses the bayonet 12 against the housing 101 . Therefore, it is possible to prevent the vehicular lighting device 1 from detaching from the housing 101 .

The connector 105 can be fitted to the ends of the plurality of power supply terminals 31 exposed inside the hole 10b. A power source (not shown) or the like can be electrically connected to the connector 105 . Therefore, by fitting the connector 105 to the ends of the plurality of power supply terminals 31, the light emitting element 22 can be electrically connected to a power source (not shown).

Further, the connector 105 can be provided with a sealing member 105a. When the connector 105 having the seal member 105a is inserted into the hole 10b, the hole 10b is sealed so as to be watertight. The seal member 105a has an annular shape and can be made of an elastic material such as rubber or silicone resin.

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.

1 vehicle lighting device, 1a central shaft, 10 socket, 20 light emitting module, 21 substrate, 22 light emitting element, 22a light emitting element, 22a1 to 22g light emitting element, 25 control section, 25a voltmeter, 25b switch, 100 vehicle lamp, 101 housing

Claims (6)

a socket;
a substrate provided on one end side of the socket;
five or more light emitting elements provided on the substrate;
a control unit configured to reduce the number of the light-emitting elements to be lit when the input voltage falls below a predetermined value;
and
When viewed in a direction along the central axis of the vehicle lighting device, the control unit includes a first light emitting element provided at a position overlapping the central axis, and a first light emitting element provided across the central axis, A vehicle lighting device capable of turning off a pair of second light emitting elements having the same distance from a central axis. a socket;
a substrate provided on one end side of the socket;
a first light emitting element provided on the substrate;
a pair of second light emitting elements provided on the substrate;
a controller configured to reduce the number of light- emitting elements to be lit when the input voltage falls below a predetermined value;
and
When viewed from a direction along the central axis of the vehicle lighting device, the first light emitting element is provided at a position overlapping with the central axis , and the pair of second light emitting elements are arranged so as to overlap the central axis. provided on both sides and having the same distance from the central axis,
The control unit is a vehicle lighting device capable of turning off the pair of second light emitting elements . a socket;
a substrate provided on one end side of the socket;
a pair of first light emitting elements provided on the substrate;
a pair of second light emitting elements provided on the substrate and aligned in one direction with the pair of first light emitting elements;
a controller configured to reduce the number of light- emitting elements to be lit when the input voltage falls below a predetermined value;
and
When viewed from the direction along the central axis of the vehicle lighting device, the pair of first light-emitting elements are provided at positions that are point-symmetrical with respect to the central axis, and the pair of second light-emitting elements The light emitting elements are provided at positions that are symmetrical with respect to each other with respect to the central axis,
The vehicle lighting device , wherein the control section can turn off the pair of first light emitting elements or the pair of second light emitting elements . 3. The vehicle lighting device according to claim 1, wherein the pair of second light emitting elements are provided at positions that are point-symmetrical with respect to the central axis. The vehicle lighting device according to any one of claims 1 to 4 , wherein when the input voltage exceeds a predetermined value, the control section can turn on all of the light emitting elements. A vehicle lighting device according to any one of claims 1 to 5 ;
a housing to which the vehicle lighting device is attached;
A vehicle lamp equipped with

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