阅读说明：本技术 元件用基板、发光元件模块以及发光装置 (Element substrate, light-emitting element module, and light-emitting device ) 是由 莲沼亮太 于 2020-03-19 设计创作，主要内容包括：元件用基板(1)具备绝缘基板(10)、配设在绝缘基板(10)上的电极布线(11)、抵接在绝缘基板(10)的散热构件(12)、电连接在电极布线(11)的柔性基板(13)、安装在柔性基板(13)的温度检测元件(14)、以及粘接剂层(15)。使粘接剂层(15)介于温度检测元件(14)与散热构件(12)的延伸部分(20)之间,并且使粘接剂层(15)也介于柔性基板(13)的对置面(30a)与散热构件(12)的延伸部分(20)之间。(The element substrate (1) is provided with an insulating substrate (10), electrode wiring (11) arranged on the insulating substrate (10), a heat dissipation member (12) in contact with the insulating substrate (10), a flexible substrate (13) electrically connected to the electrode wiring (11), a temperature detection element (14) mounted on the flexible substrate (13), and an adhesive layer (15). An adhesive layer (15) is interposed between the temperature detection element (14) and the extended portion (20) of the heat dissipation member (12), and the adhesive layer (15) is also interposed between the facing surface (30a) of the flexible substrate (13) and the extended portion (20) of the heat dissipation member (12).)

1. A substrate for an element includes:

an insulating substrate made of ceramic;

an electrode wiring disposed on the 1 st surface of the insulating substrate and electrically connected to an element;

a heat radiation member abutting against a 2 nd surface of the insulating substrate on a side opposite to the 1 st surface;

a flexible substrate electrically connected to the electrode wiring;

a temperature detection element mounted on an opposite surface of the flexible substrate that is opposite to the heat dissipation member or the insulating substrate; and

and an adhesive layer interposed between the temperature detection element and the heat dissipation member and at least one of the facing surface and the heat dissipation member.

2. The substrate for element according to claim 1, wherein,

the temperature detection element is surrounded by the adhesive layer.

3. The substrate for element according to claim 1 or 2, wherein,

the flexible substrate has a resin film in a band shape, and signal wiring lines arranged on one surface of the resin film,

the signal wiring line includes a pair of wiring lines extending in a longitudinal direction of the resin film,

the temperature detection element is located between the pair of wirings in a width direction of the resin film.

4. The substrate for device as set forth in any one of claims 1 to 3,

the heat dissipation member is a metal plate-like member.

5. The substrate for element according to claim 4, wherein,

the plate-like member includes an extending portion extending from the insulating substrate in a plan view,

the opposed surface is opposed to the extending portion.

6. The substrate for device as set forth in any one of claims 1 to 3,

the heat radiation member is a metal heat sink.

7. The substrate for element according to claim 6, wherein,

the heat sink has an abutting surface against which the 2 nd surface abuts,

the contact surface includes an extension region extending from the insulating substrate in a plan view,

the opposed surface is opposed to the extended region.

8. A light-emitting element module is provided with:

the substrate for element as claimed in any one of claims 1 to 5; and

and a light-emitting element electrically connected to the electrode wiring.

9. A light-emitting device is provided with:

the light-emitting element module according to claim 8;

a heat sink on which the light emitting element module is mounted; and

a fan that air-cools the heat sink.

10. A light-emitting element module is provided with:

the substrate for element of claim 6 or 7; and

and a light-emitting element electrically connected to the electrode wiring.

11. A light-emitting device is provided with:

the light-emitting element module according to claim 10; and

a fan that air-cools the heat sink.

Technical Field

The present disclosure relates to an element substrate, a light-emitting element module, and a light-emitting device.

Background

Patent documents 1 and 2 describe an example of a conventional technique.

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 58-193171

Patent document 2: japanese Kokai publication No. 2010-532214

Disclosure of Invention

The element substrate of the present disclosure is configured to include:

an insulating substrate made of ceramic;

an electrode wiring disposed on the 1 st surface of the insulating substrate and electrically connected to an element;

a heat radiation member abutting against a 2 nd surface of the insulating substrate on a side opposite to the 1 st surface;

a flexible substrate electrically connected to the electrode wiring;

a temperature detection element mounted on an opposite surface of the flexible substrate to the heat dissipation member or the insulating substrate; and

and an adhesive layer interposed between the temperature detection element and the heat dissipation member and at least one of the facing surface and the heat dissipation member.

The light emitting element module of the present disclosure is configured to include:

the above-mentioned device substrate; and

and a light-emitting element electrically connected to the electrode wiring.

The light-emitting device of the present disclosure is configured to include:

the light emitting element module described above;

a heat sink on which the light emitting element module is mounted; and

a fan that air-cools the heat sink.

Drawings

The objects, features and advantages of the present disclosure will become more apparent from the detailed description and the accompanying drawings.

Fig. 1 is a plan view showing an element substrate according to embodiment 1 of the present disclosure.

Fig. 2 is a cross-sectional view of the device substrate taken along line a-a of fig. 1.

Fig. 3 is a cross-sectional view showing an element substrate according to embodiment 2 of the present disclosure.

Fig. 4 is a schematic cross-sectional view of a light-emitting element module and a light-emitting device according to embodiment 3 of the present disclosure.

Fig. 5 is a schematic cross-sectional view of an element substrate, a light-emitting element module, and a light-emitting device according to embodiment 4 of the present disclosure.

Detailed Description

A light emitting element such as a Light Emitting Diode (LED) and an arithmetic element such as an Integrated Circuit (IC) generate heat by themselves during operation. The heat generation causes adverse effects such as a decrease in electrical characteristics of the element or a reduction in lifetime. In order to cool the self-heating element, in the configuration of the element substrate of the present disclosure as a base, the element is mounted on the substrate, and the substrate is further disposed on a heat radiation member such as a heat sink to radiate heat.

In order to confirm whether or not the element is sufficiently cooled, a thermistor for detecting the temperature of the element may be used. The thermistor detects, for example, the temperature of the heat sink to indirectly confirm the temperature of the element.

In such a configuration based on the device substrate of the present disclosure, since the temperature is indirectly detected, the response is poor, and the device is controlled based on the detected temperature with poor accuracy. In order to detect the temperature of the element with high accuracy, it is necessary to position the thermistor close to the element, and for example, it is conceivable to dispose the thermistor on a flexible substrate electrically connected to an element substrate.

However, the flexible substrate may be locally vibrated or displaced by an air flow for air-cooling a metal heat dissipation member such as a heat sink, and the thermistor may contact the heat dissipation member to cause an electrical short circuit.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 is a plan view showing an element substrate according to embodiment 1 of the present disclosure. Fig. 2 is a cross-sectional view of the device substrate taken along line a-a of fig. 1. The element mounted on the element substrate is an element which self-generates heat by application of current during operation, and examples thereof include a light emitting element such as a light emitting diode or a semiconductor laser, a light receiving element such as a photodiode, an arithmetic element such as a CPU (central processing unit), a heat generating element such as a heat generating resistor (heat element), an image pickup element such as a CCD (charge coupled device), and a semiconductor memory element typified by a flash memory.

The element substrate 1 includes: an insulating substrate 10; an electrode wiring 11 disposed on the insulating substrate 10; a heat dissipation member 12 bonded to the insulating substrate 10; a flexible substrate 13 electrically connected to the electrode wiring 11; a temperature detection element 14 mounted on the flexible substrate 13; and an adhesive layer 15.

The insulating substrate 10 is made of ceramic, and for example, alumina (Al) can be used₂O₃) Substrate, aluminum nitride (AlN) substrate, silicon nitride (Si)₃N₄) And ceramic substrates having high thermal conductivity, such as substrates. The shape of the outer shape of the insulating substrate 10 is, for example, a rectangular shape. An electrode wiring 11 is disposed on the 1 st surface 10a of the insulating substrate 10, and an element 16 is electrically connected to the electrode wiring 11. In the present embodiment, the element 16 is mounted on the 1 st surface 10a which is the same as the electrode wiring 11. As the electrode wire 11, for example, a metal material such as tungsten (W), molybdenum (Mo), manganese (Mn), silver (Ag), copper (Cu), or an alloy containing at least one kind of metal material selected from these is used. The exposed portion of the electrode wire 11 may be covered with a nickel (Ni) plating layer or a gold (Au) plating layer.

The heat dissipation member 12 is joined to the 2 nd surface 10b of the insulating substrate 10 on the opposite side of the 1 st surface 10 a. The heat radiation member 12 is, for example, a metal plate member or a metal heat sink, and contains a metal material such as copper (Cu), aluminum (Al), or molybdenum (Mo). In the present embodiment, the heat radiation member 12 is a plate-shaped member made of metal. The insulating substrate 10 and the heat dissipation member 12 can be bonded using a solder such as a silver solder, for example.

In the present embodiment, the outer shape of the heat dissipation member 12 is a rectangular shape, and the outer shape of the heat dissipation member 12 is larger than the outer shape of the insulating substrate 10. The heat dissipation member 12 includes an extension portion 20 extending from the insulating substrate 10 in a plan view. The extension portion 20 is located at a position surrounding the insulating substrate 10. The larger the outer shape of the heat radiating member 12, the larger the heat radiating area and the heat transfer area, and the more excellent the cooling capability of the element 16.

The flexible substrate 13 is formed of a resin film 13a made of a resin material such as polyimide as a flexible insulating substrate, and signal wiring 13b is disposed on one surface of the resin film 13 a. One end of the signal wiring 13b is electrically connected to the electrode wiring 11. The other end of the signal line 13b is electrically connected to a control board or the like described later. The signal wiring 13b and the electrode wiring 11 are joined by a joining material 17 such as solder.

The flexible substrate 13 includes: a 1 st portion 30 facing the 1 st surface 10a of the insulating substrate 10 and the extension portion 20 of the heat dissipating member 12; and a 2 nd portion 31 connected to the 1 st portion 30 and bent. The 1 st section 30 has an opposing surface 30a opposing the extension section 20, and the temperature detection element 14 is attached to the opposing surface 30 a.

The temperature detection element 14 can be, for example, a thermistor. By being mounted on the opposed face 30a, the temperature detecting element 14 approaches the extension portion 20, or approaches or contacts the insulating substrate 10, detecting the temperature of the extension portion 20. The extension portion 20 is in the vicinity of the insulating substrate 10, and can detect the temperature with high accuracy at a position closer to the element mounted on the element substrate 1 than in the conventional case. Further, if the temperature detection element 14 is configured to be in close proximity to or in contact with the insulating substrate 10, the temperature of the insulating substrate 10 can be detected, and the temperature can be detected with high accuracy at a position closer to the mounted element than the extension portion 20.

The adhesive layer 15 is interposed between the temperature detection element 14 and the heat dissipation member 12 (extension portion 20) and at least one of the opposing surface 30a and the heat dissipation member 12 (extension portion 20). Since the temperature detection element 14 is close to the heat radiation member 12, there is a possibility that an electrical short circuit may occur when the temperature detection element 14 is in contact with the metal heat radiation member 12. In the present embodiment, the adhesive layer 15 is interposed between the temperature detection element 14 and the extension portion 20 of the heat radiation member 12. The adhesive layer 15 is mainly composed of, for example, silicone resin, and can ensure electrical insulation between the temperature detection element 14 and the heat dissipation member 12, thereby suppressing the occurrence of an electrical short circuit. Further, the adhesive layer 15 is also interposed between the facing surface 30a of the flexible substrate 13 and the extended portion 20 of the heat radiating member 12. The bonding force between the 1 st part 30 of the adhesive layer 15 and the heat dissipation member 12 is applied to the bonding force between the signal wiring 13b and the electrode wiring 11 of the bonding material 17, and the bonding strength between the electrode wiring 11 and the heat dissipation member 12 and the flexible substrate 13 is improved. Since the temperature detection element 14 is configured to be in close proximity to or in contact with the insulating substrate 10, the temperature detection element 14 is less likely to be electrically short-circuited, and therefore the adhesive layer 15 may be interposed only between the facing surface 30a of the flexible substrate 13 and the extended portion 20 of the heat dissipation member 12. In the case where the temperature detection element 14 is configured to be in proximity to or in contact with the insulating substrate 10 and is located in a position close to the electrode wiring 11 or the element 16, the adhesive layer 15 may be further interposed between the electrode wiring 11 and the temperature detection element 14, between the element 16 and the temperature detection element 14, or the like, thereby suppressing the occurrence of an electrical short circuit. The adhesive layer 15 may be further interposed between the facing surface 30a and the insulating substrate 10, independently of the position of the temperature detection element 14.

The portion 15a of the adhesive layer 15 interposed between the temperature detection element 14 and the extended portion 20 of the heat dissipation member 12 and the portion 15b interposed between the facing surface 30a and the extended portion 20 of the heat dissipation member 12 may be connected or separated. In this embodiment, the portion 15a and the portion 15b are connected.

The signal wiring 13b of the flexible substrate 13 includes a pair of wirings 13b1, 13b2 extending in the longitudinal direction of the resin film 13 a. One wiring 13b1 of the pair of wirings 13b1 and 13b2 is disposed near one end portion in the width direction of the resin film 13a, and the other wiring 13b2 is disposed near the other end portion in the width direction of the resin film 13 a. The temperature detection element 14 is located between the pair of wirings 13b1, 13b2 in the width direction of the resin film 13 a.

Fig. 3 is a cross-sectional view showing an element substrate according to embodiment 2 of the present disclosure. In the present embodiment, the same components as those in embodiment 1 are denoted by the same reference numerals and detailed description thereof is omitted, except that the structure of the adhesive layer 15A is different. In the present embodiment, the temperature detection element 14 is surrounded by the adhesive layer 15A. At this time, a part of the adhesive layer 15A may extend to the side surface of the heat radiating member 12 so as to cover the side surface of the temperature detecting element 14 from the facing surface 30a of the 1 st portion 30. In this way, when the adhesive layer 15A is interposed between the facing surface 30a and the heat radiation member 12, the bonding strength between the heat radiation member 12 and the flexible board 13 is further improved.

The temperature detection element 14 of the present embodiment is, for example, a rectangular parallelepiped shape. One surface thereof is bonded to the facing surface 30a of the 1 st part 30, the surface located on the opposite side of the one surface is covered with the portion 15A of the adhesive layer 15A, and the remaining four surfaces are all covered with the portion 15b interposed between the facing surface 30a and the extended portion 20 of the heat radiation member 12. Since the temperature detection element 14 is surrounded by the adhesive layer 15A in this way, the temperature detection element 14 is sealed by the adhesive layer 15A, and adhesion of moisture, adhesion of dust, and the like can be reduced, and detection accuracy of the temperature by the temperature detection element 14 can be further improved.

Fig. 4 is a schematic cross-sectional view of a light-emitting element module and a light-emitting device according to embodiment 3 of the present disclosure. The light-emitting device 100 includes a light-emitting element module 50, a heat sink 60 on which the light-emitting element module 50 is mounted, and a fan 70 for cooling the heat sink 60 with air. The light-emitting device 100 further includes a housing 80 that houses the light-emitting element module 50 and the heat sink 60, and a control substrate 90 that is electrically connected to the flexible substrate 13. In the present embodiment, the elements mounted on the element substrate 1 are light-emitting elements, and the light-emitting element module 50 includes the element substrate 1 and the light-emitting elements 16A.

The heat spreader 60 includes a metal material such as copper or aluminum. The shape of the heat sink 60 is not particularly limited, and may be a shape having a plurality of fins (Fin)61, for example, in order to improve heat dissipation efficiency. The light emitting element module 50 is mounted on the side of the heat sink 60 opposite to the fins 61. The fixing of the light emitting element module 50 to the heat sink 60 may be performed by, for example, providing screw holes or through holes in the heat radiating member 12 and fastening them by screws, or may be performed by joining the heat radiating member 12 to the heat sink 60 with solder or the like.

The fan 70 is disposed to face the fins 61, and introduces outside air to generate an airflow toward the fins 61, thereby air-cooling the heat sink 60. Although not shown, the casing 80 is provided with an exhaust port for exhausting air introduced into the interior by the fan 70.

The control substrate 90 is electrically connected to the flexible substrate 13, and transmits a light emission control signal to the light emitting element 16A via the signal wiring 13b of the flexible substrate 13. The control board 90 is also electrically connected to the temperature detection element 14, and transmits a light emission control signal corresponding to the detected temperature to the light emitting element 16A. Further, the control board 90 may be electrically connected to the fan 70, and the operation of the fan 70 may be controlled based on the detected temperature.

A translucent window member 81 for taking out light emitted from the light emitting element 16A to the outside is provided in a portion of the case 80 facing the light emitting element 16A.

In the light-emitting device 100 having such a configuration, the flexible substrate 13 may be vibrated or displaced by an air flow for cooling the heat sink 60, which enters the inside of the housing 80 by the fan 70. In contrast, since at least the 1 st portion 30 of the flexible substrate 13 is firmly bonded to the electrode wiring 11 and the heat dissipation member 12 via the adhesive layer 15(15A), and the adhesive layer 15(15A) is interposed between the temperature detection element 14 and the heat dissipation member 12, it is possible to suppress electrical short circuit due to contact between the temperature detection element 14 and the heat dissipation member 12.

Fig. 5 is a schematic cross-sectional view of an element substrate, a light-emitting element module, and a light-emitting device according to embodiment 4 of the present disclosure. In the present embodiment, the heat sink 60 doubles as the heat radiation member 12. In each of the above embodiments, the heat radiating member 12 is configured as a metal plate-like member, but in the present embodiment, a metal heat sink 60 is used instead of the plate-like member. The radiator 60 can be the same radiator as the radiator 60 used in embodiment 3.

As described above, the element substrate 1 of the present embodiment has the same configuration as that of embodiment 2 except that the heat sink 60 is provided as a heat radiation member instead of the plate-shaped member, and the 2 nd surface 10b of the insulating substrate 10 directly contacts the heat sink 60. The light-emitting element module 50 is configured such that the light-emitting element 16A is mounted as an element on the element substrate 1 provided with the heat sink 60. The light-emitting device 100 of the present embodiment has the same configuration as the light-emitting device 100 of embodiment 3, except that the light-emitting element module 50 is provided.

The insulating substrate 10 may be fixed to the heat sink 60 by, for example, providing screw holes or through holes in the insulating substrate 10 and fastening the screw holes or by joining the insulating substrate 10 and the heat sink 60 together with solder or the like.

The heat sink 60 has a contact surface 60a with which the 2 nd surface 10b of the insulating substrate 10 contacts. The contact surface 60a includes an extension region 60b extending from the insulating substrate 10 in a plan view. The extension region 60b is similar to the extension portion 20 of the heat radiation member 12 as a plate-like member, and the facing surface 30a of the 1 st portion 30 of the flexible substrate 13 faces the extension region 60 b.

In the present embodiment, the adhesive layers 15A are interposed between the temperature detection element 14 and the extended region 60b of the heat sink 60, and between the facing surface 30a of the 1 st portion 30 of the flexible board 13 and the extended region 60b of the heat sink 60, respectively. The bonding force between the 1 st portion 30 of the adhesive layer 15A and the heat sink 60 is applied to the bonding force between the signal wiring 13b and the electrode wiring 11 of the bonding material 17, and the bonding strength between the electrode wiring 11 and the heat sink 60 and the flexible substrate 13 is improved.

In the light-emitting device 100 having such a configuration, the flexible substrate 13 may be vibrated or displaced by an air flow for cooling the heat sink 60, which enters the inside of the housing 80 by the fan 70. In contrast, since at least the 1 st portion 30 of the flexible substrate 13 is firmly bonded to the electrode wiring 11 and the heat sink 60 via the adhesive layer 15(15A), and the adhesive layer 15(15A) is interposed between the temperature detection element 14 and the heat sink 60, it is possible to suppress electrical short circuit due to contact between the temperature detection element 14 and the heat sink 60.

The present disclosure may be the following embodiments.

The element substrate of the present disclosure is configured to include:

an insulating substrate made of ceramic;

an electrode wiring disposed on the 1 st surface of the insulating substrate and electrically connected to an element;

a heat radiation member abutting against a 2 nd surface of the insulating substrate on a side opposite to the 1 st surface;

a flexible substrate electrically connected to the electrode wiring;

a temperature detection element mounted on an opposite surface of the flexible substrate that is opposite to the heat dissipation member or the insulating substrate; and

and an adhesive layer interposed between the temperature detection element and the heat dissipation member and at least one of the facing surface and the heat dissipation member.

The light emitting element module of the present disclosure is configured to include:

the above-mentioned device substrate; and

and a light-emitting element electrically connected to the electrode wiring.

The light-emitting device of the present disclosure is configured to include:

the light emitting element module described above;

a heat sink on which the light emitting element module is mounted; and

a fan that air-cools the heat sink.

According to the element substrate, the light-emitting element module, and the light-emitting device of the present disclosure, the temperature of the element can be detected with high accuracy by the temperature detection element, and the occurrence of an electrical short circuit in the temperature detection element mounted on the flexible substrate can be suppressed, so that the bonding strength between the flexible substrate and the electrode wiring can be improved.

Although the present disclosure has been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications and improvements can be made to the structure in which the embodiments are combined with each other, without departing from the scope of the present disclosure. Therefore, the foregoing embodiments are merely exemplary in all respects, and the scope of the present disclosure is defined by the appended claims and not restricted to the text of the specification. Further, all modifications and variations that fall within the scope of the claims are intended to be included within the scope of the present disclosure.

Description of the symbols

1: a substrate for an element;

10: an insulating substrate;

10 a: the 1 st surface;

10 b: the 2 nd surface;

11: electrode wiring;

12: a heat dissipating member;

13: a flexible substrate;

13 a: a resin film;

13 b: a signal wiring;

13b1, 13b 2: wiring;

14: a temperature detection element;

15. 15A: an adhesive layer;

16: an element;

16A: a light emitting element;

17: a bonding material;

20: an extension portion;

30: part 1;

30 a: opposite surfaces;

31: part 2;

50: a light emitting element module;

60: a heat sink;

60 a: an abutting surface;

60 b: an extension region;

61: a fin;

70: a fan;

80: a housing;

81: a window member;

90: a control substrate;

100: a light emitting device.