JP2018081832A - Light source unit and lighting appliance for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit which can independently control lighting-on/off while mounting a plurality of light emitting diodes on a baseboard at two-dimensionally high density, and a lighting appliance for a vehicle.SOLUTION: In a light source unit, a plurality of light emitting diodes (58) are aligned and mounted on a baseboard (51) in a first direction and a second direction, the light emission control of the light emitting diodes (58) is performed by control elements (56, 57) which are mounted on the baseboard (51), a prescribed number of the light emitting diodes (58) are connected to a plurality of the control elements (56, 57), respectively, and grouped in a plurality of pieces, a plurality of the control elements (56, 57) are connected to each other, there are arranged a power supply connector (54) for supplying power to the light emitting diodes (58) and a signal connector (55) for supplying control signals to the control elements (56, 57), and the power supply connector (54) and the signal connector (55) are arranged while sandwiching a plurality of the light emitting diodes (58) in the first direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light source unit and a vehicle lamp, and more particularly to a light source unit and a vehicle lamp provided with a plurality of light emitting diodes on the surface of an element mounting substrate.

  In general, a vehicular lamp can be switched between a low beam and a high beam. The low beam illuminates the neighborhood with a predetermined illuminance, and the light distribution regulation is determined so as not to give glare to the oncoming vehicle and the preceding vehicle, and is mainly used when traveling in an urban area. On the other hand, the high beam illuminates a wide area in the front and a distant area with a relatively high illuminance, and is mainly used when traveling at high speed on a road with few oncoming vehicles and preceding vehicles. Therefore, although the high beam is more visible to the driver than the low beam, there is a problem that glare is given to the driver or pedestrian of the vehicle existing in front of the vehicle.

  In recent years, ADB (Adaptive Driving Beam) technology has been proposed that dynamically and adaptively controls a high-beam light distribution pattern based on the state around the vehicle. ADB technology reduces glare given to a vehicle or a pedestrian by detecting the presence of a preceding vehicle, an oncoming vehicle or a pedestrian in front of the vehicle, and dimming a region corresponding to the vehicle or the pedestrian. is there. In such ADB technology, there has been proposed one in which light emitting elements such as a plurality of LEDs (Light Emitting Diodes) are mounted in a row on a substrate to turn off LEDs in a region corresponding to a vehicle or a pedestrian ( For example, Patent Document 1).

  Further, in recent years, there has been proposed a technique in which a large number of light emitting elements are two-dimensionally arranged on a substrate and a high beam light distribution pattern is controlled in more detail by selectively switching off and on the light emitting elements. In a vehicular lamp that performs such a two-dimensional arrangement of light-emitting elements, it is necessary to increase the mounting density of the light-emitting elements and improve the mounting position accuracy in order to irradiate a two-dimensional light distribution pattern satisfactorily. is there. When an LED is used as a light emitting element, a surface mount type package is used, and a structure in which individual LEDs are positioned and mounted on lands formed on a substrate is mounted with high density.

Japanese Patent Laying-Open No. 2015-016773

  In ADB technology using LEDs as light emitting elements, it is necessary to individually control lighting and extinguishing of individual LEDs mounted on a substrate. Therefore, power wiring and control wiring are connected to individual LEDs, Power is supplied to the power wiring and the anode and the cathode are short-circuited according to the control signal. Even in a vehicular lamp in which a plurality of LEDs are two-dimensionally arranged, in order to use ADB technology, it is necessary to connect power wiring and control wiring to each LED. It was difficult to improve the mounting density for forming.

  Accordingly, an object of the present invention is to provide a light source unit and a vehicle lamp that can individually control lighting and extinguishing while mounting a plurality of light emitting diodes on a substrate in a two-dimensional and high density manner. .

  In order to solve the above problems, a light source unit of the present invention includes a plurality of light emitting diodes arranged in a first direction and a second direction on a substrate, and a control element mounted on the substrate. A light source unit that performs light emission control, includes a plurality of the control elements, a plurality of the light emitting diodes are connected to each of the plurality of control elements, and a plurality of the control elements are connected to each other. A power supply connector for supplying power to the light emitting diode, and a signal connector for supplying a control signal to the control element, the power supply connector and the signal connector, In the first direction, the plurality of light emitting diodes are sandwiched.

  In such a light source unit of the present invention, since the power supply connector and the signal connector are provided with a plurality of light emitting diodes sandwiched between them, wiring for supplying power to the light emitting diodes and a control signal to the control element are provided. It is possible to separately provide wiring for supplying light, and to control lighting and extinguishing individually while mounting a plurality of light emitting diodes on a substrate in a two-dimensional high density.

  In one aspect of the present invention, a connector power supply wiring connected to the power supply connector, a LED power supply wiring connected to the light emitting diode, and an inter-element wiring connecting the adjacent control elements are provided on the substrate. The connector power supply wiring and the LED power supply wiring are connected by a jumper wire that bridges the upper part of the inter-element wiring.

  In one embodiment of the present invention, the plurality of groups of light emitting diodes are arranged along a first direction, and the plurality of light emitting diodes connected to the control element are arranged in two rows in the first direction within the group. The control elements are arranged in the second direction adjacent to the plurality of light emitting diodes arranged in groups.

  In the aspect of the invention, the plurality of light emitting diodes are arranged rotationally symmetrical in the second direction.

  In order to solve the above problems, a light source unit according to the present invention includes a plurality of light emitting diodes arranged in a first direction and a second direction on a substrate, and the light emitting diode is a control element mounted on the substrate. A plurality of the control elements, each of the plurality of the control elements being connected to a predetermined number of the light-emitting diodes, and the light-emitting diodes of the plurality of groups are grouped together. A plurality of the light emitting diodes arranged along one direction and connected to one control element are arranged in two rows in the first direction within the group, and the plurality of light emitting diodes grouped The control element is disposed adjacent to the second direction.

  In such a light source unit of the present invention, the grouped light emitting diodes are arranged in two rows in the first direction, and the control elements are arranged adjacent to each other in the second direction. It is possible to individually control lighting and extinguishing while mounting two-dimensionally at a high density.

  In order to solve the above problems, a vehicular lamp according to the present invention includes any one of the light source units described above.

  According to the present invention, it is possible to provide a light source unit and a vehicular lamp that can individually control lighting and extinguishing while mounting a plurality of light emitting diodes on a substrate in a two-dimensional high density.

It is a model perspective view which shows the vehicle lamp 100 in 1st Embodiment. It is a schematic plan view which shows the outline of the light source unit 50 in 1st Embodiment. It is a circuit diagram which shows a part of circuit structure on the element mounting board | substrate 51 in 1st Embodiment. It is a schematic plan view which expands partially and shows the wiring structure of the element mounting substrate 51 in 2nd Embodiment. It is a schematic plan view which expands and shows partially the wiring structure of the element mounting substrate 51 in 3rd Embodiment. It is a schematic plan view which expands partially and shows the arrangement | sequence of the light emitting diode 58 mounted on the element mounting board | substrate 51 in 4th Embodiment.

(First embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. FIG. 1 is a schematic perspective view showing a vehicular lamp 100 according to the present embodiment. The vehicular lamp 100 includes a base member 10, a lens holder 20, a substrate holder 30, a lens 40, a light source unit 50, and a heat dissipation unit 60. In FIG. 1, the electrical connection from the outside of the vehicular lamp 100, the wiring inside the vehicular lamp 100, and the like are not shown. Moreover, in order to obtain a desired light distribution pattern and light amount, a reflecting mirror may be provided.

  The base member 10 is a plate-like member that holds each member, and a lens holder 20 and a substrate holder 30 are attached to both sides. The lens holder 20 is a pair of members attached to both sides of the base member 10. A support column is erected above the base member 10, and the lens 40 is fixed between the support columns. The substrate holder 30 is a pair of members attached to both sides of the base member 10. A support column is erected above the base member 10, and the light source unit 50 and the heat radiation unit 60 are fixed between the support columns. . Here, a plate-like member is shown as the base member 10, and a column is shown as the lens holder 20 and the substrate holder 30, but each may be a part of a casing or the like that forms the outer shape of the vehicular lamp 100.

  The lens 40 is an optical element disposed in front of the light source unit 50, and is held between the lens holders 20 above the base member 10. The light source unit 50 is a component that irradiates light by mounting a plurality of light emitting elements, electronic components, connectors, and the like on the surface of the substrate on which the wiring is patterned. Is held between. The heat dissipating unit 60 is an element for dissipating heat generated by light emission by the light emitting element on the light source unit 50. The heat dissipating unit 60 includes fins and cooling fans, for example, and is attached to the rear of the light source unit 50.

  FIG. 2 is a schematic plan view showing an outline of the light source unit 50 in the present embodiment. In the light source unit 50, a plurality of power supply wirings 52 and signal wirings 53 are formed on an element mounting substrate 51. A power supply connector 54, a signal connector 55, a plurality of control elements 56 and 57, and a plurality of light emitting diodes 58 are provided. It is installed.

  The power supply wiring 52 is a wiring pattern formed on the element mounting substrate 51, and electrically connects the power supply connector 54 and the light emitting diode 58. The signal wiring 53 is a wiring pattern formed on the element mounting substrate 51, and electrically connects the signal connector 55 and the control elements 56 and 57.

  The power supply connector 54 is a connector connected to the light emitting diode 58 via a wiring pattern formed on the element mounting substrate 51, and a cable or the like is connected from the outside of the light source unit 50 to the power supply wiring 52. Power is supplied to the light emitting diode 58. The signal connector 55 is a connector connected to the control elements 56 and 57 via the signal wiring 53 formed on the element mounting substrate 51, and a cable or the like is connected from the outside of the light source unit 50 to control the elements 56 and 57. A control signal is transmitted to. As shown in FIG. 2, the power supply connector 54 and the signal connector 55 are provided across a region where a plurality of light emitting diodes 58 are mounted in the left-right direction in FIG.

  The control elements 56 and 57 are electrically connected to the light emitting diode 58 and the signal connector 55 via the signal wiring 53 formed on the element mounting substrate 51, and emit light based on the control signal transmitted from the signal connector 55. This element controls the turning on, off, and dimming of the diode 58. As shown in FIG. 2, the control element 56 and the control element 57 are mounted adjacent to the area where the plurality of light emitting diodes 58 are mounted in the vertical direction in FIG. It is arranged between.

  The light emitting diodes 58 are mounted in a surface mount on lands (not shown) formed in a plurality of rows in the matrix direction provided on the surface of the element mounting substrate 51, and a predetermined light is supplied by supplying power. Is emitted. The light emitting diode 58 is electrically connected to the power supply connector 54 via the power supply wiring 52, and is connected to the control elements 56 and 57 via the signal wiring 53. FIG. 2 shows an example in which 96 light-emitting diodes 58 are arranged in four rows of 24, but the number and the number in the matrix direction are not limited as long as they are two-dimensionally arranged.

  The plurality of light emitting diodes 58 are grouped in a predetermined number, and the light emitting diodes 58 of each group are connected to one control element 56 or control element 57. In the example shown in FIG. 2, 96 light emitting diodes 58 are divided into 8 groups and controlled by 8 control elements 56 and 57, and two control elements 56 arranged in the lower part of the figure are arranged in two lower rows. The light emitting diodes 58 are controlled, and the upper two rows of the light emitting diodes 58 are controlled by four control elements 57 arranged at the upper side in the figure. Accordingly, each of the control elements 56 and 57 controls lighting, extinguishing, and dimming of 12 of the light emitting diodes 58 arranged in the upper and lower two rows.

  FIG. 3 is a circuit diagram showing a part of the circuit configuration on the element mounting substrate 51 in the present embodiment. One control element 56 is connected to the signal connector 55, and adjacent control elements 56 are also connected by inter-element wiring, and a control signal supplied from the signal connector 55 is transmitted to each control element 56. . A plurality of grouped light emitting diodes 58 are connected in series and both ends thereof are connected to the power supply connector 54, and the anode and cathode of each light emitting diode 58 are connected to the terminal of the control element 56. Although not shown in FIG. 3, the four control elements 56 are connected by inter-element wiring, and a plurality of grouped light emitting diodes 58 are connected to each control element 56. Although the control element 56 is shown in FIG. 3, the control element 57 has the same configuration.

  The control elements 56 and 57 incorporate a plurality of switching elements, short-circuit the anode and the cathode of the light emitting diode 58 selected according to the control signal, and bypass the current flowing through the selected light emitting diode 58 to turn off the light. Let In this way, when power is supplied to the power supply connector 54 and the control signal is supplied to the signal connector 55 to the vehicular lamp 100 via a cable or the like (not shown), a plurality of control elements 56 and 57 are used. The light emitting diode 58 is controlled to emit light, and light from the light emitting diode 58 passes through the lens 40 and is irradiated in front of the vehicular lamp 100. At this time, lighting, extinction, dimming, etc. are controlled according to the position of the light emitting diodes 58 arranged two-dimensionally, so that the light emitted forward from the lens 40 corresponds to a vehicle or a pedestrian. The light distribution is reduced in area.

  As shown in FIG. 2, in the vehicular lamp 100 of the present embodiment, a plurality of light emitting diodes 58 are arranged on the element mounting substrate 51 in the horizontal direction (first direction) in the figure and the vertical direction (second direction) in the figure. The power supply connector 54 and the signal connector 55 are provided at the ends in the left-right direction in FIG. As a result, the power supply wiring 52 and the signal wiring 53 formed on the surface of the element mounting board 51 are respectively connected to the light emitting diode 58, the control element 56, the power supply connector 54 and the signal connector 55 at the left and right ends of the element mounting board 51. The mounting density of the light emitting diodes 58 can be improved by extending to 57 and simplifying by changing the wiring path.

  Further, since the plurality of control elements 56 and 57 are connected to each other by inter-element wiring, all the control elements 56 and 57 can be connected to the single control element 56 and 57 from the signal connector 55. On the other hand, a control signal is transmitted. Therefore, the anodes and cathodes of the light emitting diodes 58 that are grouped and connected in series are connected to the control elements 56 and 57, and the anode and the cathode of the light emitting diode 58 selected by the control signal are controlled to turn on and off individually. Can be controlled.

  As shown in FIG. 2, a plurality of groups of light emitting diodes 58 are arranged in a plurality of columns along the horizontal direction in the figure, and a plurality of control elements 56 are adjacent to the plurality of light emitting diodes 58 in the vertical direction in the figure. , 57 are arranged side by side in the horizontal direction in the figure. As a result, the control signals can be transmitted by connecting the control elements 56 and 57 with the inter-element wiring. In addition, the area where the grouped light-emitting diodes 58 are mounted and the area where the control elements 56 and 57 are mounted can be separated to reduce the area of the area where the light-emitting diodes 58 are mounted. The mounting density of the diodes 58 can be improved.

  As described above, in the light source unit 50 and the vehicular lamp 100 according to this embodiment, the plurality of light emitting diodes 58 are two-dimensionally and densely mounted on the element mounting substrate 51 and individually controlled to be turned on and off. It is possible.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. A description of the same parts as those in the first embodiment will be omitted. FIG. 4 is a schematic plan view showing a partially enlarged wiring structure of the element mounting substrate 51 in the present embodiment.

  As shown in FIG. 2, a plurality of light emitting diodes 58 are grouped and arranged as a plurality of columns side by side in the horizontal direction in the figure, and a plurality of controls are arranged in the lower part of the figure adjacent to the area where the light emitting diodes 58 are mounted. An element 56 is mounted. A plurality of control elements 56 are also arranged in the left-right direction in the figure, and the control elements 56 are connected by an inter-element wiring 53a, and the control element 56 and each light emitting diode 58 are connected by a bypass wiring 53b. ing. The power supply wiring 52 for supplying power to the light emitting diode 58 is formed separately into the connector power supply wiring 52a and the LED power supply wiring 52b, and the connector power supply wiring 52a and the LED power supply wiring 52b are connected by a jumper wire 59. Has been.

  The connector power supply wiring 52 a is a wiring pattern formed in a region outside the control element 56 in FIG. 2, and is extended from the power supply connector 54 to the vicinity of the control element 56. The LED power supply wiring 52 b is a wiring pattern formed in a region inside the control elements 56 and 57 in FIG. 2, and is formed extending from a region near the control element 56 to the light emitting diode 58. As shown in FIG. 4, the LED power supply wiring 52b is connected to both ends of a plurality of light emitting diodes 58 that are grouped and connected in series.

  The inter-element wiring 53a is a wiring pattern for connecting terminals of adjacent control elements 56, and a control signal transmitted from the signal connector 55 to one control element 56 is transmitted to each control element via the inter-element wiring 53a. 56. The bypass wiring 53 b is a wiring pattern that extends from the anode and cathode of the light emitting diode 58 that are grouped and connected in series to the terminal of the control element 56. Inside the control element 56, the bypass wirings 53b of the light emitting diodes 58 selected according to the control signal are short-circuited, and the current flowing through the selected light emitting diodes 58 is bypassed and turned off.

  The jumper wire 59 is a three-dimensional wiring structure provided so as to straddle the space above the inter-element wiring 53a, and is, for example, a jumper pin or a jumper wire. The jumper wire 59 bridges the upper part of the inter-element wiring 53a and connects between the connector power supply wiring 52a and the LED power supply wiring 52b, so that the connector power supply wiring 52a, the jumper wire 59, and the LED power supply are connected from the power supply connector 54. Power is supplied to the light emitting diode 58 via the wiring 52b.

  As shown in FIG. 4, in the light source unit 50 of this embodiment, the adjacent control elements 56 are connected by inter-element wiring 53a, and the upper part is bridged by a jumper line 59 to connect the connector power supply wiring 52a and the LED power supply wiring. 52b is connected. This simplifies the connection of the inter-element wiring 53a, the power supply wiring 52, and the bypass wiring 53b, and allows a large current to flow through the power supply wiring 52. Further, the mounting density of the light emitting diodes 58 can be improved by simplifying the wiring.

(Third embodiment)
Next, a third embodiment of the present invention will be described. A description of the same parts as those in the first embodiment will be omitted. FIG. 5 is a schematic plan view showing a partially enlarged wiring structure of the element mounting substrate 51 in the present embodiment.

  As shown in FIG. 5, in the present embodiment, six light emitting diodes 58 are arranged in two rows in the horizontal direction in the drawing, and twelve light emitting diodes 58 are connected to the control elements 56 and 57 as one group. (Not shown). Here, an example in which twelve are arranged in a 6 × 2 manner is shown, but the number of light emitting diodes 58 belonging to one group and the number of matrices are not limited to this.

In the area where the light emitting diode 58 is mounted, anode lands 581 and cathode lands 582 are alternately formed, and the LED power supply wiring 52b is extended to the anode lands 581 and the cathode lands 582 located at both ends. ing. The anode land 581 and the cathode land of the light emitting diodes 58 adjacent to each other in the vertical direction and the horizontal direction are electrically connected as a pair, and the common bypass wiring 53 b extends to the control elements 56 and 57.
When the light emitting diodes 58 are mounted on the anode land 581 and the cathode land 582 formed in this way, the light emitting diodes 58 in the group are connected in series, and the anode and cathode of each light emitting diode 58 are connected as shown in FIG. Is a circuit configuration connected to the control elements 56 and 57 by the bypass wiring 53b. Further, the light emitting regions 583 of the light emitting diodes 58 are evenly arranged at equal intervals.

  In the light source unit 50 of the present embodiment, adjacent anode lands 581 and cathode lands 582 are electrically connected as a pair, and are connected to the control elements 56 and 57 by a common bypass wiring 53b. Therefore, the wiring is simplified. The mounting density of the light emitting diodes 58 can be improved.

  In particular, since the light emitting diodes 58 arranged in the horizontal direction and the vertical direction in the drawing are alternately connected, it is only necessary to secure one line of the bypass wiring 53b as an interval in the horizontal direction between the light emitting diodes 58, Further, the mounting density can be improved.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. A description of the same parts as those in the first embodiment will be omitted. FIG. 6 is a schematic plan view showing a partially enlarged arrangement of the light emitting diodes 58 mounted on the element mounting substrate 51 in the present embodiment.

As shown in FIG. 6, the plurality of grouped light-emitting diodes 58 are arranged in the left-right direction in the figure and the up-down direction in the figure. At this time, the light emitting diodes 58 are arranged so that the upper half row and the lower half row are rotationally symmetric in the vertical direction in the figure. Although not shown in FIG. 6, the bypass wiring 53b extending from the light emitting diodes 58 arranged in the lower half is connected to the control element 56 shown in the lower part of FIG. 2, and the light emitting diodes arranged in the upper half. The bypass wiring 53b extended from 58 is connected to the control element 57 shown at the top in FIG.
In FIG. 6, in the upper half of the area where the light emitting diode 58 is mounted, the anode and the cathode are repeatedly arranged in order from left to right, and in the lower half in the figure, the cathode and the anode are repeatedly arranged in order from left to right. The plurality of light emitting diodes 58 are mounted so that the light emitting region 583 is rotationally symmetric in the upper half and the lower half in the drawing, and the light emitting regions 583 are equally spaced in the horizontal direction in the drawing and the vertical direction in the drawing. Are arranged as follows.

  As a result, the pattern of the LED power supply wiring 52b and the bypass wiring 53b is simplified to improve the mounting density of the light emitting diodes 58, and the light quantity distribution in a plane from the plurality of light emitting diodes 58 arranged two-dimensionally is made uniform. It becomes possible to do.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Vehicle lamp 10 ... Base member 20 ... Lens holder 30 ... Substrate holder 40 ... Lens 50 ... Light source unit 60 ... Heat radiation part 51 ... Element mounting substrate 52 ... Power supply wiring 52a ... Connector power supply wiring 52b ... LED power supply wiring 53 ... Signal Wiring 53a ... Inter-element wiring 53b ... Bypass wiring 54 ... Power supply connector 55 ... Signal connector 56 ... Each control element 56, 57 ... Control element 57 ... Control element 58 ... Light emitting diode 581 ... Anode land 582 ... Cathode land 583 ... Light emitting area 59 ... Jumper wire

Claims (6)

A plurality of light emitting diodes are arranged and mounted in a first direction and a second direction on a substrate, and a light source unit that performs light emission control of the light emitting diodes with a control element mounted on the substrate,
A plurality of the control elements, a predetermined number of the light emitting diodes are connected to each of the plurality of control elements, and a plurality of the control elements are connected to each other.
A power supply connector for supplying power to the light emitting diode;
A signal connector for supplying a control signal to the control element;
The light source unit, wherein the power supply connector and the signal connector are provided across the plurality of light emitting diodes in the first direction. The light source unit according to claim 1,
Connector power wiring connected to the power supply connector, LED power wiring connected to the light emitting diode, and inter-element wiring connecting the adjacent control elements are formed on the substrate,
The light source unit, wherein the connector power supply wiring and the LED power supply wiring are connected by a jumper wire that bridges the inter-element wiring. The light source unit according to claim 1 or 2,
The plurality of groups of light emitting diodes are arranged along a first direction, and the plurality of light emitting diodes connected to the control element are arranged in two rows in the first direction within the group,
The light source unit, wherein the control element is arranged in the second direction adjacent to the grouped light emitting diodes. The light source unit according to any one of claims 1 to 3,
The light source unit, wherein the plurality of light emitting diodes are arranged rotationally symmetrical in the second direction. A plurality of light emitting diodes are arranged and mounted in a first direction and a second direction on a substrate, and a light source unit that performs light emission control of the light emitting diodes with a control element mounted on the substrate,
A plurality of the control elements, each of the plurality of control elements is connected to a predetermined number of the light emitting diodes, and is grouped;
The light emitting diodes of the plurality of groups are arranged along a first direction, and the plurality of light emitting diodes connected to one control element are arranged in two rows in the first direction within the group,
The light source unit, wherein the control element is arranged in the second direction adjacent to the grouped light emitting diodes. A vehicle lamp comprising the light source unit according to any one of claims 1 to 5.