CN212691659U

CN212691659U - Lighting device for vehicle and lighting device for vehicle

Info

Publication number: CN212691659U
Application number: CN202021779460.6U
Authority: CN
Inventors: 小杉大资
Original assignee: Toshiba Lighting and Technology Corp
Current assignee: Toshiba Lighting and Technology Corp
Priority date: 2019-11-22
Filing date: 2020-08-24
Publication date: 2021-03-12
Anticipated expiration: 2030-08-24
Also published as: JP2021079899A; JP7319591B2

Abstract

The utility model provides a can restrain the change of the grading characteristic that produces under the condition of the luminous element quantity that reduces to need to light and lighting device and lamps and lanterns for vehicle for the vehicle. The lighting device for a vehicle according to an embodiment includes: a lamp socket; a substrate provided on one end side of the lamp holder; three or more light-emitting elements provided on the substrate; and a control unit that reduces the number of the light emitting elements that need to be turned on when an input voltage is equal to or less than a predetermined value, wherein the control unit is capable of turning off a1 st light emitting element that is provided at a position overlapping with a central axis of the vehicle lighting device or a pair of 2 nd light emitting elements that are provided with the central axis therebetween and that have a distance equal to each other when viewed in a direction along the central axis.

Description

Lighting device for vehicle and lighting device for vehicle

Technical Field

The embodiment of the utility model relates to a lighting device and vehicle lamps and lanterns for vehicle for the vehicle.

Background

In view of energy saving, long life, and the like, a vehicle lighting device having a light emitting diode has been widely used instead of a vehicle lighting device having a filament.

Here, the voltage (input voltage) applied to the vehicle lighting device varies. For example, the input voltage generally varies within a range of 9V to 16V. If the input voltage drops, the total luminous flux decreases corresponding to the forward voltage drop of the plurality of light emitting diodes connected in series. Therefore, if the input voltage decreases, the total luminous flux of the vehicle lighting device may become smaller than the predetermined value.

Therefore, a technique has been proposed to reduce the number of light emitting diodes to be lit when the input voltage is lowered. If the number of light emitting diodes to be lit is reduced, the forward voltage drop becomes small, and thus the required total luminous flux can be ensured.

However, if only the number of light emitting diodes that need to be lit is reduced, the light distribution characteristics (e.g., the irradiation range) of the vehicle illumination device may vary significantly.

Therefore, it is desired to develop a technique capable of suppressing a change in light distribution characteristics that occurs when the number of light emitting diodes that need to be lit is reduced.

Patent document 1: japanese patent laid-open publication No. 2015-63252

Disclosure of Invention

An object of the present invention is to provide a lighting device for a vehicle and a lighting fixture for a vehicle, which can suppress a change in light distribution characteristics caused when the number of light emitting elements to be lit is reduced.

The lighting device for a vehicle according to an embodiment includes: a lamp socket; a substrate provided on one end side of the lamp holder; three or more light-emitting elements provided on the substrate; and a control unit that reduces the number of the light emitting elements that need to be turned on when an input voltage is equal to or less than a predetermined value, wherein the control unit is capable of turning off a1 st light emitting element that is provided at a position overlapping with a central axis of the vehicle lighting device or a pair of 2 nd light emitting elements that are provided with the central axis therebetween and that have a distance equal to each other when viewed in a direction along the central axis.

In the lighting device for a vehicle, the pair of 2 nd light emitting elements are provided at positions point-symmetrical to each other with the central axis as a center of symmetry.

In the lighting device for a vehicle, the light emitting elements are provided in five or more numbers, and the control unit can turn off the 1 st light emitting element and the pair of 2 nd light emitting elements.

In the vehicle lighting device, the control unit may turn on all the light emitting elements when the input voltage exceeds a predetermined value.

The vehicle lamp according to the embodiment includes: the lighting device for a vehicle; and a housing to which the lighting device for a vehicle is attached.

According to the embodiments of the present invention, it is possible to provide a lighting device for a vehicle and a lighting fixture for a vehicle, which can suppress a change in light distribution characteristics that occurs when the number of light emitting elements that need to be lit is reduced. .

Drawings

Fig. 1 is a schematic perspective view illustrating a vehicle lighting device according to the present embodiment.

Fig. 2 is a schematic sectional view of the vehicular illumination device in fig. 1, taken along line a-a.

Fig. 3 is a circuit diagram of a light emitting module.

Fig. 4 (a) is a schematic plan view illustrating a state in which three light-emitting elements are lit. Fig. 4 (b) is a schematic side view illustrating a state in which three light emitting elements are lit.

Fig. 5 (a) is a schematic plan view for illustrating a case of a lighting state or a case of a lighting-off state according to the comparative example. Fig. 5 (b) is a schematic side view for illustrating a case of a lighting state or a case of a lighting-off state according to the comparative example.

Fig. 6 (a) is a schematic plan view for illustrating a lighting state or a lighting-off state according to the present embodiment. Fig. 6 (b) is a schematic side view for illustrating a case of a lighting state or a case of a light-off state according to the present embodiment.

Fig. 7 (a) is a schematic plan view for illustrating a case of a lighting state or a case of a lighting-off state according to another embodiment. Fig. 7 (b) is a schematic side view for illustrating a case of a lighting state or a case of a lighting-off state according to another embodiment.

Fig. 8 (a) and (b) are schematic plan views illustrating a lighting state or a lighting-off state according to still another embodiment.

Fig. 9 (a) to (e) are schematic plan views illustrating a lighting state or a lighting-off state according to still another embodiment.

Fig. 10 (a) to (f) are schematic plan views illustrating a lighting state or a lighting-off state according to still another embodiment.

Fig. 11 (a) to (f) are schematic plan views illustrating a lighting state or a lighting-off state according to still another embodiment.

Fig. 12 (a) to (e) are schematic plan views illustrating a lighting state or a lighting-off state according to still another embodiment.

Fig. 13 (a) and (b) are schematic plan views illustrating a lighting state or a lighting-off state according to still another embodiment.

Fig. 14 is a partial schematic sectional view for illustrating a vehicle lamp.

In the figure: 1-lighting device for vehicle, 1 a-center axis, 10-lamp holder, 20-light emitting module, 21-substrate, 22-light emitting element, 22a 1-22 g-light emitting element, 25-control section, 25 a-voltmeter, 25 b-switch, 100-lighting device for vehicle, 101-frame.

Detailed Description

Hereinafter, embodiments will be described by way of example with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

(Lighting device for vehicle)

The vehicle lighting device 1 according to the present embodiment may be installed in, for example, an automobile, a railway vehicle, or the like. As the vehicle lighting device 1 installed in an automobile, for example, a front combination Lamp (for example, a combination Lamp in which a Daytime Running Lamp (DRL), a width Lamp, a turn signal Lamp, and the like are appropriately combined), a rear combination Lamp (for example, a combination Lamp in which a stop Lamp, a tail Lamp, a turn signal Lamp, a backup Lamp, a fog Lamp, and the like are appropriately combined), and the like can be used. However, the application of the vehicle lighting device 1 is not limited to this.

Fig. 1 is a schematic perspective view illustrating a vehicle lighting device 1 according to the present embodiment.

Fig. 2 is a schematic cross-sectional view of the vehicular illumination device 1 in fig. 1, taken along line a-a.

As shown in fig. 1 and 2, the vehicle lighting device 1 may be provided with a socket 10, a light emitting module 20, and a power supply unit 30.

The lamp socket 10 may have a mounting portion 11, an engaging pin 12, a flange 13, and a heat sink 14.

The mounting portion 11 may be provided on a surface of the flange 13 on the side opposite to the side on which the heat sink 14 is provided. The mounting portion 11 may have a cylindrical shape. The mounting portion 11 has an external shape of, for example, a cylindrical shape. The mounting portion 11 may have a recess 11a opened at an end portion on the side opposite to the flange 13 side.

The engaging pin 12 may be provided on an outer side surface of the mounting portion 11. For example, the engagement pin 12 protrudes outward of the vehicle lighting device 1. The joint pin 12 may be opposed to the flange 13. The joint pin 12 may be provided in plurality. The engaging pin 12 can be used when the lighting device 1 for a vehicle is mounted on the housing 101 of the lighting device 100 for a vehicle. The dowel pin 12 may be used as a twist lock.

The flange 13 may be plate-shaped. The flange 13 may be, for example, disc-shaped. The outer side surface of the flange 13 may be located further to the outside of the vehicle lighting device 1 than the outer side surface of the engaging pin 12.

The heat sink 14 may be provided on the side of the flange 13 opposite to the mounting portion 11 side. At least one heat sink 14 may be provided. For example, in the example of fig. 1 and 2, a plurality of heat sinks 14 are provided on the lamp socket 10. The plurality of fins 14 may be arranged in a predetermined direction. The heat radiating fins 14 may have a plate shape.

Also, the lamp socket 10 may be provided with a hole 10b into which the connector 105 is inserted. The connector 105 having the sealing member 105a may be inserted into the hole 10 b. Therefore, the cross-sectional shape and the cross-sectional size of the hole 10b may be a shape and a size corresponding to the cross-sectional shape and the cross-sectional size of the connector 105 having the sealing member 105 a.

The lamp socket 10 may have both a function of holding the light emitting module 20 and the power supply part 30 and a function of transferring heat generated in the light emitting module 20 to the outside. Therefore, the lamp socket 10 is preferably made of a material having a high thermal conductivity, such as metal.

In recent years, the lamp socket 10 is expected to effectively dissipate heat generated in the light emitting module 20 and to be lightweight. Therefore, the lamp socket 10 is more preferably made of a high thermal conductive resin. The highly thermally conductive resin includes, for example, a resin and a filler composed of an inorganic material. The highly thermally conductive resin may be a resin obtained by mixing a filler made of carbon, alumina, or the like with a resin such as PET (polyethylene terephthalate) or nylon.

By using the lamp socket 10 in which the mounting portion 11, the joint pin 12, the flange 13, and the heat sink 14 are formed integrally and which contains a high thermal conductive resin, heat generated in the light emitting module 20 can be effectively dissipated. Also, the weight of the lamp socket 10 can be reduced. At this time, the mounting portion 11, the joint pin 12, the flange 13, and the heat sink 14 may be integrally molded by injection molding or the like. The lamp socket 10 and the power supply portion 30 may be integrally molded by insert molding or the like.

The light-emitting module 20 (substrate 21) may be bonded to the bottom surface 11a1 of the recess 11a, for example. The adhesive used for bonding the light emitting module 20 is preferably an adhesive having a high thermal conductivity. For example, the adhesive may be an adhesive mixed with a filler made of an inorganic material. The thermal conductivity of the adhesive can be, for example, 0.5W/(mK) or more and 10W/(mK) or less. Further, a heat transfer plate including metal may be provided between the light emitting module 20 (the base plate 21) and the socket 10.

The light emitting module 20 may include 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 may be a quadrangle, for example. The substrate 21 may be made of, for example, an inorganic material such as ceramic (e.g., alumina or aluminum nitride), an organic material such as phenol paper or glass epoxy, or the like. The substrate 21 may be a metal plate whose surface is coated with an insulating material. In the case where the surface of the metal plate is coated with an insulating material, the insulating material may be an insulating material containing an organic material or an insulating material containing an inorganic material. When the amount of heat generated by the light emitting element 22 is large, the substrate 21 is preferably made of a material having a high thermal conductivity in view of heat dissipation. Examples of the material having a high thermal conductivity include ceramics such as alumina and aluminum nitride, a highly thermally conductive resin, and a material in which a surface of a metal plate is coated with an insulating material. Further, the substrate 21 may have a single-layer structure or a multi-layer structure.

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

The light emitting element 22 may be provided on the opposite side of the substrate 21 from the bottom surface 11a1 side of the recess 11 a. The light emitting elements 22 may be provided in three or more. The light emitting elements 22 may be connected in series with each other. Further, the light emitting element 22 may be connected in series with the resistor 23.

The light emitting element 22 may be, for example, a light emitting diode, an organic light emitting diode, a laser diode, or the like.

The light-emitting element 22 may be a surface mount type light-emitting element such as a PLCC (Plastic Leaded Chip Carrier/Leaded Plastic Chip Carrier) type. The light emitting element 22 may be a light emitting element with a lead wire such as a shell type light emitting element. The light-emitting element 22 illustrated in fig. 1 is a surface-mount light-emitting element.

The light-emitting element 22 may be a light-emitting element packaged by COB (Chip On Board) technology. When the light-emitting element 22 is a light-emitting element packaged by the COB technique, the substrate 21 may be provided with: a chip-shaped light-emitting element 22, a wire electrically connecting the light-emitting element 22 and the wiring pattern 21a, a frame-shaped member surrounding the light-emitting element 22 and the wire, a sealing portion provided inside the frame-shaped member, and the like. In this case, the frame-shaped member may have both a function of determining the formation range of the sealing portion and a function of the mirror. Further, the sealing portion may contain a phosphor. The phosphor may be, for example, a YAG phosphor (yttrium aluminum garnet phosphor). Further, only the sealing portion may be provided without providing a frame-shaped member. In the case where only the sealing portion is provided, a dome-shaped sealing portion is provided on the substrate 21.

The light emitting surface of the light emitting element 22 faces the front side of the vehicle lighting device 1. The light emitting element 22 emits light mainly 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 the examples, and may be appropriately changed according to the size, the application, and the like of the vehicle illumination device 1.

The resistor 23 may be provided on the opposite side of the substrate 21 from the bottom surface 11a1 side of the recess 11 a. The resistor 23 may be electrically connected to the wiring pattern 21 a. The resistor 23 may be a surface mount resistor, a resistor with lead (metal oxide film resistor), a film-like resistor formed by a screen printing method, or the like, for example. The resistor 23 illustrated in fig. 1 is a surface-mount resistor.

Ruthenium oxide (RuO) can be used as a material of the film-like resistor₂). For example, a film-like resistor can be formed by a screen printing method or 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, and thus the heat dissipation can be improved. Then, the plurality of resistors 23 can be formed by one process. Therefore, productivity can be improved. Further, 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, the luminance (luminous flux, luminance, emission intensity, illuminance) of light emitted from the light-emitting element 22 varies when the applied voltage between the anode terminal and the ground terminal is constant. Therefore, the value of the current flowing through the light emitting element 22 is adjusted to fall within a predetermined range by the resistor 23, and the luminance of the light emitted from the light emitting element 22 falls within the predetermined range. At this time, by changing the resistance value of the resistor 23, the value of the current flowing through the light emitting element 22 can be controlled within a predetermined range.

In the case where the resistor 23 is a surface-mount resistor, a resistor with lead, or the like, the resistor 23 having an appropriate resistance value can be selected in accordance with the forward voltage characteristics of the light-emitting element 22. When the resistor 23 is a film-like resistor, the resistance value can be increased by removing a part of the resistor 23. The number, size, arrangement, and the like of the resistors 23 are not limited to the examples, and the number, size, arrangement, and the like of the resistors 23 may be appropriately changed according to the number, specification, and the like of the light emitting elements 22.

The diode 24 may be provided on the opposite side of the substrate 21 from the bottom surface 11a1 side of the recess 11 a. The diode 24 may be electrically connected to the wiring pattern 21 a. The diode 24 is provided for the purpose of, for example, not applying a reverse voltage to the light emitting element 22 and not applying a reverse impulse noise to the light emitting element 22.

The control portion 25 may be provided on the side of the substrate 21 opposite to the side of the bottom surface 11a1 of the recess 11 a. The control unit 25 may be provided on the bottom surface 11a1 side of the recess 11a of the substrate 21, or may be provided inside the socket 10 or in the housing 101 of the vehicle lighting device 100. However, if control unit 25 is provided on the opposite side of substrate 21 from bottom surface 11a1 side of recess 11a, electrical connection between control unit 25 and light-emitting element 22 becomes easy.

The control section 25 may be electrically connected to the wiring pattern 21 a. The control section 25 changes the number of light emitting elements 22 that need to be lit up according to the input voltage. For example, when the input voltage exceeds a predetermined value, the control unit 25 may turn on all the light emitting elements 22. For example, when the input voltage is equal to or lower than a predetermined value, the control unit 25 may turn off some of the light-emitting elements 22. That is, when the input voltage is equal to or lower than the predetermined value, the control unit 25 can reduce the number of light emitting elements 22 that need to be lit.

The light-off state in this specification includes not only a case where light is not emitted from the light-emitting element 22 at all, but also a case where light-emitting element 22 emits unintended weak light due to a flow of a minute current through the light-emitting element 22.

The operation of the control unit 25 will be described in detail later.

The power supply portion 30 may have a power supply terminal 31 and a holding portion 32.

The power supply terminal 31 may be a rod-shaped body. The power supply terminal 31 may protrude from the bottom surface 11a1 of the recess 11 a. The power supply terminal 31 may be provided in plurality. The plurality of power supply terminals 31 may be arranged in a predetermined direction. The plurality of power supply terminals 31 extend inside the holding portion 32. The ends of the plurality of power supply terminals 31 on the light-emitting module 20 side may be soldered to the wiring pattern 21a provided on the substrate 21. The ends of the plurality of power supply terminals 31 on the heat sink 14 side may be exposed to the inside of the hole 10b of the lamp socket 10. The connector 105 can be fitted to the plurality of power supply terminals 31 exposed to the inside of the hole 10 b. The power supply terminal 31 may be made of metal such as copper alloy, for example. The number, shape, arrangement, material, and the like of the power supply terminals 31 are not limited to the examples, and may be appropriately changed.

As described above, the lamp socket 10 is preferably made of a material having a high thermal conductivity. However, materials with higher thermal conductivity sometimes have electrical conductivity. For example, a highly thermally conductive resin using a carbon-containing filler has electrical conductivity. Therefore, the holding portion 32 may be provided in order to ensure insulation between the power supply terminal 31 and the lamp socket 10 having conductivity. The holding portion 32 may have a function of holding the plurality of power supply terminals 31. In addition, in the case where the lamp socket 10 is made of a high thermal conductive resin having insulation properties (for example, a high thermal conductive resin using a filler containing alumina, etc.), the holding portion 32 may be omitted. At this time, the plurality of power supply terminals 31 may be held by the lamp socket 10.

The holding portion 32 may be made of resin having insulating properties. The holding portion 32 may be press-fitted into the hole 10a provided in the socket 10 or bonded to the inner wall of the hole 10a, for example.

Next, the operation of the control unit 25 will be further described.

Although the vehicle lighting device 1 uses a battery as a power source, a voltage (input voltage) applied to the vehicle lighting device 1 may vary. For example, the normal operating standard voltage (rated voltage) of the vehicle lighting device 1 for an automobile is 13.5V. However, the input voltage may fluctuate due to a drop in the battery voltage, an operation of the alternator, an influence of the circuit, and the like. Therefore, the vehicle lighting device 1 for an automobile defines an operating voltage range (voltage variation range). For example, the operating voltage range is generally 9V or more and 16V or less, and may be 7V or more and 16V or less.

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 addition, near the lower limit of the operating voltage range, the total luminous flux of the vehicle lighting device 1 may become smaller than a predetermined value. For example, when the forward voltage drop of the light emitting element 22 is about 3V, a voltage drop of 9V occurs when three light emitting elements 22 are connected in series. Further, the three light emitting elements 22 are also connected in series with a resistor 23. Therefore, when the input voltage becomes about 9V, almost no current flows through the three light emitting elements 22, and the total luminous flux of the vehicle lighting device 1 becomes smaller than a predetermined value.

Fig. 3 is a circuit diagram of the light emitting module 20.

As shown in fig. 3, the light emitting module 20 includes three light emitting elements 22, a resistor 23, a diode 24, and a controller 25.

The three light emitting elements 22, the resistor 23, and the diode 24 are connected in series with each other.

The control section 25 may have a voltmeter 25a and a switch 25 b. The voltmeter 25a can detect the input voltage. The switch 25b may be connected in parallel with the one light emitting element 22 farthest from the input side.

When the input voltage detected by the voltmeter 25a exceeds a predetermined value, the control unit 25 may turn off the switch 25 b. When the switch 25b is turned off, the current Ia flows through the three light-emitting elements 22 connected in series, and light is emitted from all of the three light-emitting elements 22. On the other hand, when the input voltage detected by the voltmeter 25a is equal to or less than the predetermined value, the control unit 25 may turn on the switch 25 b. When the switch 25b is turned on, 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 25 b. Therefore, the forward voltage drop decreases by the amount of one light emitting element 22 through which almost no current flows, and thus the current flowing through the remaining two light emitting elements 22 can be increased. As a result, the total luminous flux of the vehicle lighting device 1 can be suppressed from becoming smaller than the predetermined value in the vicinity of the lower limit of the operating voltage range.

Although the control unit 25 having the voltmeter 25a and the switch 25b has been described above, the control unit 25 may be configured to change the number of light emitting elements 22 to which a voltage is to be applied according to an input voltage. For example, the control unit 25 may be a control unit including an input voltage determination circuit using a zener diode (constant voltage diode), a circuit which has a comparator using an operational amplifier and detects an input voltage, or the like. The control Unit 25 may be configured to include a CPU (Central Processing Unit), a memory device, and the like, and change the number of light emitting elements 22 to which a voltage needs to be applied in accordance with the detected input voltage. At this time, control may be performed according to a program stored in the storage device.

In the following, a case where the on/off is switched by the switch 25b will be described as an example.

As described above, when the number of light-emitting elements 22 to which a voltage needs to be applied is changed in accordance with the input voltage, a predetermined total luminous flux can be obtained even in the vicinity of the lower limit of the operating voltage range.

However, depending on the position where light-emitting element 22 to be turned off is arranged among light-emitting elements 22, the light distribution characteristics (for example, the irradiation range) of vehicle illumination device 1 may significantly change before and after switching by switch 25 b.

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 fig. 4 (a) and (b), three light emitting elements 22a to 22c are arranged in one direction. The light emitting element 22a is provided at a position overlapping the central axis 1a of the vehicle lighting device 1 when viewed in a direction along the central axis 1 a.

In the present specification, the overlap with the central axis 1a includes not only 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.

The

light emitting elements

22b and 22c may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry. In the present specification, the point-symmetric position refers to not only a case where the center of the light-emitting element 22 is located at a point-symmetric position, but also a case where the center of the light-emitting element 22 is allowed to be located at a position deviated from the point-symmetric position by about a manufacturing error (for example, within 1.0 mm).

Fig. 4 (a) and (b) show the case where the input voltage exceeds the predetermined value. For example, the case where the switch 25b is turned off is shown. At this time, since light is emitted from all of the three light-emitting elements 22a to 22c, the light distribution characteristic of the vehicle illumination device 1 is wide in the arrangement direction of the three light-emitting elements 22a to 22c and narrow in the direction orthogonal to the arrangement direction of the three light-emitting elements 22a to 22 c.

Fig. 5 (a) is a schematic plan view for illustrating a case of a lighting state or a case of a lighting-off state according to the comparative example.

Fig. 5 (b) is a schematic side view for illustrating a case of a lighting state or a case of a lighting-off state according to the comparative example.

Fig. 5 (a) and (b) show the case where the input voltage is equal to or lower than a predetermined value. For example, the case where the switch 25b is turned on is shown. At this time, two

light emitting elements

22a and 22c are turned on, and one light emitting element 22b is turned off. For example, the light emitting element 22b is connected in parallel with the switch 25 b.

In this way, a predetermined total luminous flux can be obtained even in the vicinity of the lower limit of the operating voltage range. However, as shown in fig. 5 (b), the light distribution characteristics of the vehicle illumination device 1 are biased toward the light emitting element 22 c. Therefore, the light distribution characteristics of the vehicle illumination device 1 significantly change before and after switching by the switch 25b, and the driver and the like are likely to feel discomfort.

Fig. 6 (a) is a schematic plan view for illustrating a lighting state or a lighting-off state according to the present embodiment.

Fig. 6 (b) is a schematic side view for illustrating a case of a lighting state or a case of a lighting-off state according to the present embodiment.

Fig. 6 (a) and (b) show the case where the input voltage is equal to or lower than a predetermined value. For example, the case where the switch 25b is turned on is shown. At this time, two

light emitting elements

22b and 22c are turned on, and one light emitting element 22a is turned off. For example, the light emitting element 22a is connected in parallel with the switch 25 b.

As described above, since the

light emitting elements

22b and 22c are provided at positions point-symmetrical to each other with the central axis 1a as the center of symmetry, as shown in fig. 6 (b), it is possible to suppress a significant change in the light distribution characteristics of the vehicle illumination device 1 before and after switching by the switch 25 b.

Fig. 7 (a) is a schematic plan view for illustrating a case of a lighting state or a case of a lighting-off state according to another embodiment.

Fig. 7 (b) is a schematic side view for illustrating a case of a lighting state or a case of a lighting-off state according to another embodiment.

Fig. 7 (a) and (b) show the case where the input voltage is equal to or lower than a predetermined value. For example, the case where the switch 25b is turned on is shown. At this time, one light emitting element 22a is turned on, and both

light emitting elements

22b and 22c are turned off. For example, the

light emitting elements

22b, 22c connected in series are connected in parallel with the switch 25 b.

As described above, since the light emitting element 22a is provided at the position of the central axis 1a, as shown in fig. 7 (b), it is possible to suppress a significant change in the light distribution characteristics of the vehicle illumination device 1 before and after switching by the switch 25 b.

In this case, the light distribution characteristics in the lit state or the unlit state illustrated in (a) and (b) in fig. 6 are different from those in the lit state or the unlit state illustrated in (a) and (b) in fig. 7. Therefore, the lighting state or the lighting-off state can be selected according to the use of the vehicle illumination device 1 and the like. For example, when a horizontally wide light distribution characteristic is desired, the lighting state or the lighting-off state illustrated in (a) and (b) in fig. 6 can be selected. For example, when the light distribution characteristics of the point light source are expected, the lighting state or the extinction state exemplified in fig. 7 (a) and (b) can be selected.

Fig. 8 (a) and (b) show a case where four light-emitting elements 22a1, 22b to 22d are arranged in one direction. The light emitting elements 22a1, 22c may be disposed at positions point-symmetrical to each other with the central axis 1a as the center of symmetry. The

light emitting elements

22b and 22d may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry.

Fig. 8 (a) and (b) show the case where the input voltage is equal to or lower than the predetermined value. For example, the case where the switch 25b is turned on is shown.

At this time, as shown in fig. 8 (a), the two light emitting elements 22a1, 22c may be turned on, and the two

light emitting elements

22b, 22d may be turned off. For example, the

light emitting elements

22b, 22d connected in series are connected in parallel with the switch 25 b.

As described above, since the light emitting elements 22a1, 22c are provided at positions point-symmetrical to each other with the central axis 1a as the center of symmetry, it is possible to suppress a significant change in the light distribution characteristics of the vehicle illumination device 1 before and after switching by the switch 25 b.

As shown in fig. 8 (b), the two light-emitting

elements

22b and 22d may be turned on, and the two light-emitting elements 22a1 and 22c may be turned off. For example, the light emitting elements 22a1, 22c connected in series are connected in parallel with the switch 25 b.

As described above, since the

light emitting elements

22b and 22d are provided at positions point-symmetrical to each other with the central axis 1a as the center of symmetry, it is possible to suppress a significant change in the light distribution characteristics of the vehicle illumination device 1 before and after switching by the switch 25 b.

In this case, the light distribution characteristics differ between the lighting state and the lighting-off state illustrated in (a) and (b) of fig. 8. Therefore, the lighting state or the lighting-off state can be selected according to the use of the vehicle illumination device 1 and the like. For example, when the light distribution characteristics of the point light source are expected, the lighting state or the lighting-off state illustrated in fig. 8 (a) can be selected. For example, when a horizontally wide light distribution characteristic is desired, the lighting state or the lighting-off state illustrated in fig. 8 (b) can be selected.

Fig. 9 (a) to (e) show a case where five light emitting elements 22a to 22e are arranged in one direction. The light emitting element 22a may be disposed at the position of the central axis 1 a. The

light emitting elements

22b and 22c may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry. The

light emitting elements

22d and 22e may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry.

Fig. 9 (a) to (e) show the case where the input voltage is equal to or lower than the predetermined value. For example, the case where the switch 25b is turned on is shown.

At this time, as shown in fig. 9 (a), the three

light emitting elements

22a, 22d, and 22e may be turned on, and the two

light emitting elements

22b and 22c may be turned off. For example, the

light emitting elements

22b, 22c connected in series are connected in parallel with the switch 25 b.

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 the positions point-symmetrical to each other with the central axis 1a as the center of symmetry. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 9 (b), two light-emitting

elements

22b and 22c may be turned on, and three light-emitting

elements

22a, 22d, and 22e may be turned off. For example, the

light emitting elements

22a, 22d, 22e connected in series are connected in parallel with the switch 25 b.

As described above, since the

light emitting elements

22b and 22c are provided at positions point-symmetrical to each other with the central axis 1a as the center of symmetry, it is possible to suppress a significant change in the light distribution characteristics of the vehicle illumination device 1 before and after switching by the switch 25 b.

As shown in fig. 9 (c), the three light-emitting

elements

22a, 22b, and 22c may be turned on, and the two light-emitting

elements

22d and 22e may be turned off. For example, the

light emitting elements

22d, 22e connected in series are connected in parallel with the switch 25 b.

light emitting elements

22b and 22c are provided at the positions point-symmetrical to each other with the central axis 1a as the center of symmetry. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 9 (d), two

light emitting elements

22d and 22e may be turned on, and three light emitting

elements

22a, 22b, and 22c may be turned off. For example, the

light emitting elements

22a, 22b, 22c connected in series are connected in parallel with the switch 25 b.

As described above, since the

light emitting elements

22d and 22e are provided at positions point-symmetrical to each other with the central axis 1a as the center of symmetry, it is possible to suppress a significant change in the light distribution characteristics of the vehicle illumination device 1 before and after switching by the switch 25 b.

As shown in fig. 9 (e), one light-emitting element 22a may be turned on, and four light-emitting

elements

22b, 22c, 22d, and 22e may be turned off. For example, the

light emitting elements

22b, 22c, 22d, and 22e connected in series are connected in parallel to the switch 25 b.

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 illumination device 1 before and after switching by the switch 25 b.

In this case, the light distribution characteristics differ between the lighting state and the lighting-off state illustrated in (a) to (e) in fig. 9. Therefore, the lighting state or the lighting-off state can be selected according to the use of the vehicle illumination device 1 and the like. For example, when the light distribution characteristics of the point light source are expected, the lighting state or the extinction state exemplified in fig. 9 (c) and (e) can be selected. Further, the lighting state or the extinction state illustrated in fig. 9 (b) may be selected. For example, when a horizontally wide light distribution characteristic is desired, the lighting state or the lighting-off state illustrated in (a) and (d) in fig. 9 can be selected.

The lighting state or the lighting-off state may be selected 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 value of the operating voltage range is small, more light-emitting elements 22 can be turned off.

Fig. 10 (a) to (f) show a case where 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 centering on the central axis 1 a. The

light emitting elements

Fig. 10 shows the case where the input voltage is equal to or lower than a predetermined value in (a) to (f). For example, the case where the switch 25b is turned on is shown.

At this time, as shown in fig. 10 (a), the three

light emitting elements

22a, 22d, and 22e may be turned on, and the two

light emitting elements

22b and 22c may be turned off. For example, the

light emitting elements

22b, 22c connected in series are connected in parallel with the switch 25 b.

light emitting elements

As shown in fig. 10 (b), the three light-emitting

elements

22a, 22b, and 22c may be turned on, and the two light-emitting

elements

22d and 22e may be turned off. For example, the

light emitting elements

22d, 22e connected in series are connected in parallel with the switch 25 b.

light emitting elements

As shown in fig. 10 (c), two

light emitting elements

22b and 22c may be turned on, and three light emitting

elements

22a, 22d, and 22e may be turned off. For example, the

light emitting elements

As described above, since the

light emitting elements

As shown in fig. 10 (d), two

light emitting elements

22d and 22e may be turned on, and three light emitting

elements

22a, 22b, and 22c may be turned off. For example, the

light emitting elements

As described above, since the

light emitting elements

As shown in fig. 10 (e), one light-emitting element 22a may be turned on, and four light-emitting

elements

22b, 22c, 22d, and 22e may be turned off. For example, the

light emitting elements

As shown in fig. 10 (f), the four light-emitting

elements

22b, 22c, 22d, and 22e may be turned on, and one light-emitting element 22a may be turned off. For example, the light emitting element 22a is connected in parallel with the switch 25 b.

As described above, since the four light-emitting elements 22b to 22e are provided at equal intervals on the circumference centering on the central axis 1a, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

In this case, the light distribution characteristics differ between the lighting state and the lighting-off state illustrated in (a) to (f) in fig. 10. Therefore, the lighting state or the lighting-off state can be selected according to the use of the vehicle illumination device 1 and the like. For example, when the light distribution characteristics of the point light source are expected, the lighting state or the extinction state exemplified in (e) and (f) of fig. 10 can be selected. For example, when a light distribution characteristic wide in one direction is desired, the lighting state or the extinction state illustrated in (a) to (d) in fig. 10 can be selected.

The lighting state or the lighting-off state may be selected according to the value of the forward voltage drop of the light-emitting element 22, the lower limit value of the operating voltage range, or the like. For example, when the voltage drop value is large or the lower limit value of the operating voltage range is small, more light-emitting elements 22 can be turned off.

Fig. 11 (a) to (f) show a 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 1 a. The

light emitting elements

22d and 22e may be disposed at equal distances from the central axis 1a with the central axis 1a therebetween. The

light emitting elements

22d and 22f may be disposed at equal distances from the central axis 1a with the central axis 1a therebetween.

Fig. 11 (a) to (f) show the case where the input voltage is equal to or lower than a predetermined value. For example, the case where the switch 25b is turned on is shown.

At this time, as shown in fig. 11 (a), the five light-emitting elements 22b to 22f may be turned on, and the light-emitting element 22a may be turned off. For example, the light emitting element 22a is connected in parallel with the switch 25 b.

As described above, the five light emitting elements 22b to 22f are arranged on the circumference centered on the central axis 1 a. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 11 (b), the four light-emitting

elements

22a, 22d, 22e, and 22f may be turned on, and the two light-emitting

elements

22b and 22c may be turned off. For example, the

light emitting elements

22b, 22c connected in series are connected in parallel with the switch 25 b.

As described above, the light emitting element 22a is provided at the position of the central axis 1 a. The

light emitting elements

22d and 22e are disposed with the central axis 1a therebetween and at the same distance from the central axis 1 a. The

light emitting elements

22d and 22f are disposed at equal distances from the central axis 1a with the central axis 1a therebetween. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 11 (c), the three light-emitting elements 22d to 22f may be turned on, and the three light-emitting elements 22a to 22c may be turned off. For example, the light emitting elements 22a to 22c connected in series are connected in parallel to the switch 25 b.

As described above, the

light emitting elements

22d and 22f are disposed with the central axis 1a therebetween and at the same distance from the central axis 1 a. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 11 (d), two

light emitting elements

22b and 22c may be turned on, and four light emitting

elements

22a, 22d, 22e, and 22f may be turned off. For example, the

light emitting elements

22a, 22d, 22e, and 22f connected in series are connected in parallel to the switch 25 b.

As described above, since the

light emitting elements

22b and 22c are provided at positions point-symmetrical to each other with the central axis 1a as the center of symmetry, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 11 (e), the three light-emitting elements 22a to 22c may be turned on, and the three light-emitting elements 22d to 22f may be turned off. For example, the light emitting elements 22d to 22f connected in series are connected in parallel to the switch 25 b.

light emitting elements

As shown in fig. 11 (f), one light-emitting element 22a may be turned on, and five light-emitting elements 22b to 22f may be turned off. For example, the light emitting elements 22b to 22f connected in series are connected in parallel to the switch 25 b.

In this case, the light distribution characteristics differ between the lighting state and the lighting-off state illustrated in (a) to (f) of fig. 11. Therefore, the lighting state or the lighting-off state can be selected according to the use of the vehicle illumination device 1 and the like. For example, when the light distribution characteristics of the point light source are desired, the lighting state or the extinction state exemplified in (a), (b), (c), and (f) in fig. 11 can be selected. For example, when a light distribution characteristic wide in one direction is desired, the lighting state or the extinction state illustrated in (d) and (e) in fig. 11 can be selected.

Fig. 12 (a) to (e) show a case where 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 centering on the central axis 1 a. The

light emitting elements

22d and 22e may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry. The

light emitting elements

22f and 22g may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry.

Fig. 12 (a) to (e) show the case where the input voltage is equal to or lower than the predetermined value. For example, the case where the switch 25b is turned on is shown.

At this time, as shown in fig. 12 (a), six light-emitting elements 22b to 22g may be turned on, and light-emitting element 22a may be turned off. For example, the light emitting element 22a is connected in parallel with the switch 25 b.

As described above, the six light emitting elements 22b to 22g are provided at equal intervals on the circumference centered on the central axis 1 a. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 12 (b), the light-emitting element 22a and the four light-emitting elements 22d to 22g may be turned on, and the two light-emitting

elements

22b and 22c may be turned off. For example, the

light emitting elements

22b, 22c connected in series are connected in parallel with the switch 25 b.

light emitting elements

22d and 22e are disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry. The

light emitting elements

22f and 22g are disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 12 (c), the four light-emitting elements 22d to 22g may be turned on, and the three light-emitting elements 22a to 22c may be turned off. For example, the light emitting elements 22a to 22c connected in series are connected in parallel to the switch 25 b.

As described above, the

light emitting elements

22d and 22e are disposed at positions point-symmetrical to each other with the central axis 1a as the center of symmetry. Since the

light emitting elements

22f and 22g are disposed at positions point-symmetrical to each other with the central axis 1a as the center of symmetry, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 12 (d), the three light-emitting elements 22a to 22c may be turned on, and the four light-emitting elements 22d to 22g may be turned off. For example, the light emitting elements 22d to 22g connected in series are connected in parallel to the switch 25 b.

light emitting elements

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

In this case, the light distribution characteristics differ between the lighting state and the lighting-off state illustrated in (a) to (e) in fig. 12. Therefore, the lighting state or the lighting-off state can be selected according to the use of the vehicle illumination device 1 and the like. For example, when the light distribution characteristics of the point light source are desired, the lighting state or the extinction state exemplified in (a), (b), (c), and (e) in fig. 12 can be selected. For example, when a light distribution characteristic wide in one direction is desired, the lighting state or the extinction state illustrated in fig. 12 (d) can be selected.

Fig. 13 (a) and (b) show a case where six light-emitting elements 22a1, 22b to 22f are arranged in two rows and three columns. The light emitting elements 22a1, 22d may be disposed at positions point-symmetrical to each other with the central axis 1a as the center of symmetry. The

light emitting elements

22b and 22f may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry. The

light emitting elements

22c and 22e may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry.

Fig. 13 (a) and (b) show the case where the input voltage is equal to or lower than a predetermined value. For example, the case where the switch 25b is turned on is shown.

At this time, as shown in fig. 13 (a), the four light-emitting

elements

22b, 22c, 22e, and 22f may be turned on, and the two light-emitting elements 22a1 and 22d may be turned off. For example, the light emitting elements 22a1, 22d connected in series are connected in parallel with the switch 25 b.

As described above, the

light emitting elements

22b and 22f are disposed at positions point-symmetrical to each other with the central axis 1a as the center of symmetry. The

light emitting elements

22c and 22e are disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

As shown in fig. 13 (b), two light emitting elements 22a1, 22d may be turned on, and four light emitting

elements

22b, 22c, 22e, 22f may be turned off. For example, the

light emitting elements

22b, 22c, 22e, and 22f connected in series are connected in parallel to the switch 25 b.

As described above, the light emitting elements 22a1, 22d are provided at positions point-symmetrical to each other with the central axis 1a as the center of symmetry. Therefore, the light distribution characteristics of the vehicle illumination device 1 can be suppressed from changing significantly before and after switching by the switch 25 b.

At this time, the light distribution characteristics differ between the lighting state and the lighting-off state illustrated in (a) and (b) of fig. 13. Therefore, the lighting state or the lighting-off state can be selected according to the use of the vehicle illumination device 1, and for example, when the light distribution characteristics of the point light source are expected, the lighting state or the lighting-off state illustrated in fig. 13 (b) can be selected. For example, when a horizontally wide light distribution characteristic is desired, the lighting state or the lighting-off state illustrated in fig. 13 (a) can be selected.

As described above, the control unit 22 may turn off the 1 st light-emitting element (for example, the light-emitting element 22a) provided at a position overlapping the central axis 1a or the pair of 2 nd light-emitting elements (for example, the light-emitting elements 22a1, 22b to 22g) provided with the central axis 1a therebetween and having the same distance from the central axis 1a when viewed in the direction along the central axis 1a of the vehicle lighting device 1.

In this case, the pair of 2 nd light emitting elements may be disposed at positions point-symmetrical to each other with the central axis 1a as a center of symmetry.

Also, five or more light emitting elements 22 may be provided. At this time, the control unit 25 may turn off the 1 st light emitting element and the pair of 2 nd light emitting elements.

When the input voltage exceeds a predetermined value, the control unit 25 may turn on all the light emitting elements 22.

(vehicle lamp)

Next, the vehicle lamp 100 is exemplified.

In the following, a case where the vehicle lamp 100 is a front combination lamp provided in an automobile will be described as an example. However, the vehicle lamp 100 is not limited to a front combination lamp provided in an automobile. The vehicle lamp 100 may be a vehicle lamp provided in an automobile, a rail vehicle, or the like.

Fig. 14 is a partial schematic sectional view for illustrating the vehicle lamp 100.

As shown in fig. 14, the vehicle lamp 100 may include a vehicle lighting device 1, a housing 101, a cover 102, an optical element portion 103, a sealing member 104, and a connector 105.

The lighting device 1 for a vehicle can be mounted on the housing 101. The frame 101 can hold the mounting portion 11. The frame 101 may have a box shape with one end open. The frame 101 may be made of, for example, a resin that does not transmit light. A mounting hole 101a into which a portion of the mounting portion 11 provided with the engagement pin 12 is inserted may be provided in the bottom surface of the frame 101. A recess into which engagement pin 12 provided in mounting portion 11 is inserted may be provided at the periphery of mounting hole 101 a. Although the case where the mounting hole 101a is directly provided in the housing 101 is described here as an example, a mounting member having the mounting hole 101a may be provided in the housing 101.

When the vehicle lighting device 1 is mounted on the vehicle lamp 100, the portion of the mounting portion 11 where the engagement pin 12 is provided is inserted into the mounting hole 101a, and the vehicle lighting device 1 is rotated. In this way, for example, the engaging pin 12 is held in the fitting portion provided at the peripheral edge of the mounting hole 101 a. This method of installation is known as twist-locking.

The cover 102 may be configured to cover the opening of the frame 101. The cover 10 may be made of a resin or the like having light transmittance. The cover 102 may also have a function of a lens or the like.

The light emitted from the vehicle lighting device 1 enters the optical element unit 103. The optical element unit 103 can reflect, diffuse, guide, and collect light emitted from the vehicle illumination device 1 to form a predetermined light distribution pattern or the like. For example, the optical element 103 illustrated in fig. 14 is a mirror. At this time, the optical element portion 103 may reflect light emitted from the vehicle illumination device 1 to form a predetermined light distribution pattern.

The sealing member 104 may be provided between the flange 13 and the frame 101. The sealing member 104 may be annular. The sealing member 104 may be made of a material having elasticity such as rubber or silicone resin.

When the vehicle lighting device 1 is mounted on 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. Then, the engaging pin 12 is pressed against the housing 101 by the elasticity of the seal member 104. Therefore, the vehicle lighting device 1 can be prevented from falling off the housing 101.

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

Also, a sealing member 105a may be provided at the connector 105. When the connector 105 having the sealing member 105a is inserted into the hole 10b, the hole 10b is sealed watertight. The sealing member 105a may have a ring shape, and the sealing member 105a may be made of a material having elasticity, such as rubber or silicone resin.

While the embodiments of the present invention have been described above by way of example, the embodiments are merely illustrative and are not intended to limit the scope of the present invention. These new embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the present invention. These embodiments and modifications thereof are within the scope and spirit of the present invention, and are included in the scope of the present invention described in the claims and the equivalent thereof. The above embodiments may be combined with each other.

Claims

1. A lighting device for a vehicle, comprising:

a lamp socket;

a substrate provided on one end side of the lamp holder;

three or more light-emitting elements provided on the substrate; and

a control part for reducing the number of the light emitting elements required to be lighted when the input voltage is below a predetermined value,

the control unit may turn off a1 st light emitting element provided at a position overlapping with a central axis of the vehicle lighting device or a pair of 2 nd light emitting elements provided with the central axis therebetween and having a distance equal to each other, when viewed in a direction along the central axis.

2. The vehicular illumination device according to claim 1,

the pair of 2 nd light emitting elements are disposed at positions point-symmetrical to each other with the central axis as a center of symmetry.

3. The vehicular illumination device according to claim 1 or 2,

the light-emitting element is provided with more than five,

the control unit can turn off the 1 st light emitting element and the pair of 2 nd light emitting elements.

4. The vehicular illumination device according to claim 1 or 2,

the control unit may turn on all the light emitting elements when the input voltage exceeds a predetermined value.

5. A vehicle lamp is characterized by comprising:

the vehicular illumination device according to any one of claims 1 to 4; and

and a housing to which the vehicle lighting device is attached.