JP2020119879A - Heater and camera module - Google Patents

Abstract

To provide a heater that can heat a lens in a short time.SOLUTION: A heater 100 includes an insulating substrate 10 having a through hole 11, a heater wire 20 provided inside the insulating substrate 10 so as to surround the through hole 11, and a terminal electrode 30 connected to the heater wire 20 and provided on the surface 12 of the insulating substrate 10, and the heater wire 20 includes a meandering wire portion 21 that is repeatedly bent with a first bent portion 21a located inside the insulating substrate 10 and a second bent portion 21b located outside, and the first bent portion 21a of the meandering wire portion 21 is arranged along the through hole 11 of the insulating substrate 10.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a heater and a camera module.

There is a vehicle in which a rear view camera is attached to a rear side or a door mirror of the vehicle (for example, see Patent Document 1 and Patent Document 2). Further, in recent years, there is one that includes an electronic door mirror that uses a camera instead of the door mirror that uses a mirror. Since such a camera is mounted on the outside of a car, the lens of the camera may become cloudy depending on the environment. In order to remove such fogging, in Patent Document 1, a transparent wire attached to a mirror housing in which a camera module is housed is coated with a heating wire transparent film. In Patent Document 2, a transparent conductive film is provided on the lens surface. Since it is costly to provide such a transparent conductive film on the lens surface, there is also one that uses a lens heater using a light source of a camera device as a heat source (for example, refer to Patent Document 3).

JP, 2003-327048, A JP-A-5-53077 JP, 2014-35370, A

However, the above-mentioned conventional lens heater cannot be applied when the near-infrared illumination section is not included. Further, since the near-infrared lighting is far from the lens and the amount of heat generated is not large, it takes time to melt and remove the snow and ice adhering to the lens.

A heater according to one aspect of the present disclosure includes an insulating substrate having a through hole, a heater wire provided inside the insulating substrate so as to surround the through hole, and connected to the heater wire. And a terminal electrode provided on the surface of the substrate, wherein the heater wire has a first bent portion located inside the insulating substrate and a second bent portion located outside, and is meandered repeatedly. A first bent portion of the meandering wire portion is arranged along the through hole of the insulating substrate.

A camera module according to one aspect of the present disclosure includes the heater configured as described above, a lens that overlaps with the heater and is thermally connected, and an imaging element.

According to the heater of one aspect of the present disclosure, it is possible to heat the lens, at least a part of which is arranged inside the through hole, in a short time.

According to the camera module of one aspect of the present disclosure, it is possible to remove fogging of a lens, ice adhered to the lens, and the like in a short time.

It is a perspective view which shows the external appearance of an example of a heater. It is a disassembled perspective view which decomposes|disassembles and shows the heater shown in FIG. (A) is a transparent plan view showing the inside of the heater shown in FIG. 1, and (b) is a sectional view taken along the line BB of (a). FIG. 3A is a transparent plan view showing an enlarged part A of FIG. 3A, and FIG. 3B is a sectional view taken along line BB of FIG. It is a disassembled perspective view which decomposes|disassembles and shows another example of a heater. (A) is a transparent plane view showing the inside of the heater shown in FIG. 5, and (b) is a cross-sectional view taken along the line BB of (a). It is a disassembled perspective view which decomposes|disassembles and shows another example of a heater. 7A is a transparent plan view showing the inside of the heater shown in FIG. 7, and FIG. 8B is a cross-sectional view taken along line BB of FIG. It is a disassembled perspective view which decomposes|disassembles and shows another example of a heater. 9A is a transparent plan view showing the inside of the heater shown in FIG. 9, and FIG. 9B is a sectional view taken along line BB of FIG. It is a disassembled perspective view which decomposes|disassembles and shows another example of a heater. 11A is a transparent plan view showing the inside of the heater shown in FIG. 11, and FIG. 11B is a sectional view taken along line BB of FIG. (A) is a transparent plane view showing the inside of another example of a heater, and (b) is a sectional view taken along the line BB of (a). It is a disassembled perspective view which decomposes|disassembles and shows another example of a heater. 14A is a transparent plan view showing the inside of the heater shown in FIG. 14, and FIG. 14B is a sectional view taken along line BB of FIG. (A) is a transparent plane view showing the inside of another example of a heater, and (b) is a sectional view taken along the line BB of (a). It is a disassembled perspective view which decomposes|disassembles and shows another example of a heater. (A) And (b) is a transparent plane view which shows the inside of the heater shown in FIG. 17, (c) is sectional drawing in CC line of (a). 18A is a transparent plan view showing an enlarged part A of FIG. 18A, FIG. 18B is a sectional view taken along line BB of FIG. 18A, and FIG. It is sectional drawing in the -C line. (A) And (b) is a transparent plane view which shows the inside of another example of a heater, (c) is sectional drawing in CC line of (a). (A) is a transparent plan view showing an enlarged main part of another example of the heater, (b) is a cross-sectional view taken along the line BB of (a), and (c) is a C of (a). It is sectional drawing in the -C line. (A) And (b) is a transparent top view which expands and shows the principal part of another example of a heater. (A) is a transparent plan view showing an enlarged main part of another example of the heater, (b) is a cross-sectional view taken along the line BB of (a), and (c) is a C of (a). It is sectional drawing in the -C line. It is a transparent plane view which expands and shows the principal part of another example of a heater. It is a transparent plane view which expands and shows the principal part of another example of a heater. (A) is a transparent plan view showing the inside of the comparative example, and (b) is a sectional view taken along line BB of (a). (A) And (b) is a perspective view which shows the external appearance of an example of a camera module. It is sectional drawing which shows an example of the cross section in the AA line of FIG.27(a). It is sectional drawing which shows another example of a camera module. It is sectional drawing which shows another example of a camera module.

A heater and a camera module according to embodiments of the present disclosure will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing the appearance of an example of a heater. FIG. 2 is an exploded perspective view showing the heater shown in FIG. 1 in an exploded manner. 3A is a transparent plan view showing the inside of the heater shown in FIG. 1, and FIG. 3B is a sectional view taken along line BB of FIG. 3A. FIG. 4A is a transparent plan view showing an enlarged part A of FIG. 3A, and FIG. 4B is a cross-sectional view taken along the line BB of FIG. 4A. FIG. 5 is an exploded perspective view showing another example of the heater in an exploded manner. 6A is a transparent plan view showing the inside of the heater shown in FIG. 5, and FIG. 6B is a cross-sectional view taken along the line BB of FIG. 6A. FIG. 7 is an exploded perspective view showing another example of the heater in an exploded manner. 8A is a transparent plan view showing the inside of the heater shown in FIG. 7, and FIG. 8B is a sectional view taken along line BB of FIG. 8A. FIG. 9 is an exploded perspective view showing another example of the heater in an exploded manner. 10A is a transparent plan view showing the inside of the heater shown in FIG. 9, and FIG. 10B is a cross-sectional view taken along the line BB of FIG. 10A. FIG. 11 is an exploded perspective view showing another example of the heater in an exploded manner. 12A is a transparent plan view showing the inside of the heater shown in FIG. 11, and FIG. 12B is a sectional view taken along the line BB of FIG. 12A. FIG. 13A is a transparent plan view showing the inside of another example of the heater, and FIG. 13B is a sectional view taken along line BB of FIG. 13A. FIG. 14 is an exploded perspective view showing another example of the heater in an exploded manner. 15A is a transparent plan view showing the inside of the heater shown in FIG. 14, and FIG. 15B is a cross-sectional view taken along the line BB of FIG. 15A. FIG. 16A is a transparent plan view showing the inside of another example of the heater, and FIG. 16B is a sectional view taken along the line BB of FIG. 16A. FIG. 17 is an exploded perspective view showing another example of the heater in an exploded manner. 18(a) and 18(b) are transmission plan views showing the inside of the heater shown in FIG. 17, and FIG. 18(c) is a sectional view taken along the line CC of FIG. 18(a). 19(a) is a transparent plan view showing an enlarged part A of FIG. 18(a), FIG. 19(b) is a sectional view taken along line BB of FIG. 19(a), and FIG. FIG. 19C is a sectional view taken along the line CC of FIG. 20A and 20B are transparent plan views showing the inside of another example of the heater, and FIG. 20C is a cross-sectional view taken along the line CC of FIG. 20A. 21A is a transparent plan view showing an enlarged main part of another example of the heater, FIG. 21B is a cross-sectional view taken along line BB of FIG. 21A, and FIG. 21C is a sectional view taken along the line CC of FIG. 22(a) and 22(b) are enlarged plan views showing the main part of another example of the heater. 23A is a transparent plan view showing an enlarged main part of another example of the heater, FIG. 23B is a cross-sectional view taken along line BB of FIG. 23A, and FIG. FIG. 23C is a sectional view taken along the line CC of FIG. 24 and 25 are each a transparent plan view showing an enlarged main part of another example of the heater. 26A is a transparent plan view showing the inside of the comparative example, and FIG. 26B is a cross-sectional view taken along the line BB of FIG. 26A. 27A and 27B are perspective views showing the appearance of an example of a camera module. 28 is a cross-sectional view showing an example of a cross section taken along line AA of FIG. 29 and 30 are sectional views showing another example of the camera module. The transparent plan view in the above drawing is a view through which the heater wire 20 can be easily seen through a part of the insulating layer 10a of the insulating substrate 10, the terminal electrode 30, the through conductor 40, and the like. The distinction between upper and lower sides in the following description is for convenience, and does not limit the upper and lower sides when the heater 100 and the camera module 600 are actually used.

1 to 16, the heater 100 includes an insulating substrate 10 having a through hole 11, a heater wire 20 provided inside the insulating substrate 10 so as to surround the through hole 11, and a heater wire. And a terminal electrode 30 provided on the surface of the insulating substrate 10. The heater wire 20 includes a meandering wire portion 21 that is repeatedly bent and has a first bent portion 21 i located inside the insulating substrate 10 and a second bent portion 21 o located outside the insulating substrate 10. The one bent portion 21i is arranged along the through hole 11 of the insulating substrate 10. The inside and the outside of the insulating substrate 10 are the inside and the outside in a plan view. Furthermore, the relative positional relationship with respect to the through hole 11 in the annular insulating substrate 10 is shown, and the position close to the through hole 11 is located inside.
To be in a position away from 1 means to be located outside. To be provided inside the insulating substrate 10 means that it is embedded in the insulating substrate 10 and is not exposed on the outer surface.

The insulating substrate 10 has a plate-like shape in which a plurality of insulating layers 10a made of ceramics are laminated, and has a through hole 11 in the central portion in a plan view. When the heater 100 is used in the camera module 600 as in the example shown in FIGS. 27 to 30, at least a part of the lens 200 is arranged in the through hole 11 of the insulating substrate 10. Therefore, the through hole 11 has a circular shape in plan view. Since the outer shape of the insulating substrate 10 is also circular, it is annular. Thereby, the lens 200 can be heated uniformly from the peripheral portion.

In the heater 100, the heater wire 20 is built in the insulating substrate 10, and the heater wire 20 is electrically connected to the terminal electrode 30 provided on the surface of the insulating substrate 10. The heater wire 20 and the terminal electrode 30 are connected by a through conductor 40 penetrating the insulating layer 10a or an internal wiring 41 between the insulating layers 10a and 10a. There are two terminal electrodes 30, one terminal electrode 30 is connected to one end of the heater wire 20, and the other one terminal electrode 30 is connected to the other end of the heater wire 20. When the voltage is applied from the outside through the terminal electrode 30, the heater wire 20 generates heat, and the heat is conducted inside the insulating substrate 10 to heat the lens 200.

As described above, the heater 100 is a ceramic heater in which the heater wire 20 is built in the insulating substrate 10 made of ceramic. Therefore, the temperature of the heater 100 rises in a short time and the lens 200 can be heated. In order to increase the temperature of the heater 100 in a shorter time, the heater wire 20 may be elongated. By forming the heater wire 20 in a bent shape, the long heater wire 20 can be built in the insulating substrate 10. In the comparative example shown in FIG. 26, the heater wire 20 extends in the circumferential direction and surrounds the through hole 11 in a spiral shape in a triple manner. On the other hand, the heater wire 20 in the heater 100 of the example shown in FIGS. 2 to 4 has a meandering shape that extends in the circumferential direction so as to repeatedly bend and surround the through hole 11. Further, the heater wire 20 in the heater 100 of the example shown in FIGS. 5 to 10 has the above-mentioned meandering portion (the meandering line portion 21) and the circular portion (outside thereof) which extends in the circumferential direction without meandering ( It is connected to the circumferential line portion 22) by a connection line portion 24, and has a shape that surrounds the through hole 11 doubly. In the examples shown in FIGS. 9 and 10, the two semicircular circumferential line portions 221 and 222 configure one circular circumferential line portion 22. Therefore, the meandering wire portion 21 and the circumferential wire portion 22 are connected at two places, and there are two connecting wire portions 24. The heater wire 20 in the heater 100 of the example shown in FIGS. 11 to 13 has a shape in which the meandering wire portion 21 and the double circumferential wire portion 22 on the outer side thereof are connected to each other and the through hole 11 is surrounded in a triple manner. The meandering wire portion 21 and the inner circumferential line portion 22 and the inner circumferential line portion 22 and the outer circumferential line portion 22 are connected by connecting line portions 24, respectively. The heater wire 20 in the heater 100 of the example shown in FIGS. 14 to 16 has a shape in which two meandering wire portions 21 and 21 are connected by a connecting wire portion 24, and the through hole 11 is doubly surrounded.

Here, a portion of the heater wire 20 having a shape that surrounds the through hole 11 by making one round, such as the meandering wire portion 21 and the circumferential wire portion 22, is referred to as a circumferential wire portion 23. The heater wire 20 in the heater 100 of the examples shown in FIGS. 5 to 10 and FIGS. 14 to 16 has two peripheral line portions 23 and has a shape that double surrounds the through hole 11. The heater wire 20 in the heater 100 of the example illustrated in FIGS. 11 to 13 has a shape having three circumferential line portions 23 and triple surrounding the through hole 11.

As described above, the heater wire 20 in the heater 100 of the present disclosure has the first bent portion 21 i located inside the insulating substrate 10 and the second bent portion 21 o located outside, and the meandering wire portion 21 is repeatedly bent. The first bent portion 21i of the meandering wire portion 21 is arranged along the through hole 11 of the insulating substrate 10. In the heater 100, the temperature in the vicinity of the bent portion, which is a portion surrounded by the heater wire 20 on three sides, tends to be higher than that in other portions. Therefore, if the first bent portions 21i of the meandering wire portion 21 that extend in the circumferential direction while meandering are arranged along the through holes 11, the temperature of the portion along the through holes 11 is likely to be particularly high. Therefore, the heater 100 having such a configuration can heat the lens 200 arranged inside the through hole 11 in a shorter time. The bent portion (the first bent portion 21i and the second bent portion 21o) is, for example, a U-shaped (c-shaped) portion surrounded by a chain double-dashed line in FIG. 4A.

As the first bent portion 21i is closer to the through hole 11 (inner surface of the insulating substrate 10), the temperature of the inner surface of the insulating substrate 10 is likely to rise in a shorter time. For example, the first bent portion 21i of the example shown in FIGS. 5 to 10 is closer to the through hole 11 (the inner side surface of the insulating substrate 10) than the first bent portion 21i of the example shown in FIGS. Therefore, the heater 100 can heat the lens 200 arranged in the through hole 11 in a shorter time. As with the first bent portion 21i, the second bent portion 21o, which tends to increase in temperature, is also closer to the through hole 11, so that the lens 200 arranged inside the through hole 11 can be heated in a shorter time. .. Further, the heater wire 20 of this example has a meandering wire portion 21 in an inner area near the through hole 11 and a circumferential wire in an outer area connected in series with the meandering wire portion 21 between the two terminal electrodes 30. And a section 22. Therefore, the entire length of the heater wire 20 is long as in the examples shown in FIGS. 2 to 4, the electric resistance values of the whole are the same, and the temperature can be similarly raised in a short time. Further, the meandering line portion 21 is located more inside than the examples shown in FIGS. 2 to 4, but a circumferential line portion 22 is provided outside the meandering line portion 21. The position of the circumferential line portion 22 is at a position overlapping with the outermost peripheral portion (second bent portion 21i) of the example shown in FIGS. Therefore, compared with the heater 100 of the example shown in FIGS. 2 to 4, the temperature difference between the inner region and the outer region of the insulating substrate 10 does not become too large, and the temperature difference inside the insulating substrate 10 is large. The heater 100 is less likely to be distorted.

In the examples shown in FIGS. 11 to 13, the entire meandering line portion 21 is located inside the center in the width direction of the insulating substrate 10 (the center between the inner side surface and the outer side surface). Compared to the examples shown in FIGS. 5 to 10, the second bent portion 21o is located closer to the through hole 11. Also in this example, the heater wire 20 is provided with a double circumferential line portion 22 in the outer region and surrounds the meandering line portion 21 in the inner region. Therefore, the entire length of the heater wire 20 is long as in the example shown in FIGS. 2 to 4 and the examples shown in FIGS. 5 to 10, and the electric resistance values of the whole are the same. Therefore, the temperature can be raised in a shorter time. Further, since the circumferential line portion 22 in the outer region is double and there is no difference in the density of the heater wires 20 in the inner region and the outer region, a large temperature difference in the insulating substrate 10 may cause distortion. It has a low heater 100.

In the heater 100 of the example shown in FIGS. 5 to 13, the heater wire 20 including the meandering wire portion 21 and the circumferential wire portion 22 surrounds the through hole 11 in a multiple manner. Like the heater wire 20 in the heater 100 in the example, the plurality of meandering wire portions 21 may surround the through hole 11 in a multiple manner. By doing so, the heater 100 can be heated in a shorter time. In the examples shown in FIGS. 14 to 16, the inner meandering line portion 21 and the outer meandering line portion 21 have the same number, circumferential arrangement, and shape of the first bent portion 21i and the second bent portion 21o. However, it is not limited to this. The shape of the heater wire 20 depends on the characteristics required for the heater 100 within a range in which the insulation between the multiple heater wires 20 in the insulating substrate 10 and the insulation between the inside and outside of the insulating substrate 10 can be secured. The number of surroundings etc. can be set.

In addition, in the examples shown in FIGS. 2 to 8, the first bent portion 21i (and the second bent portion 21o) of the meandering wire portion 21 has a bent corner shape (U-shape). On the other hand, the 1st bending part 21i (and the 2nd bending part 21o) of the example shown in FIGS. 9-16 is a curved arc shape (C shape). Therefore, even if thermal stress is generated between the heater wire 20 and the insulating substrate 10 when the heater wire 20 generates heat, there is no portion such as a corner where the stress is likely to concentrate. Therefore, even if the distance between the heater wire 20 and the through hole 11 (inner surface of the insulating substrate 10) is short, the possibility that a crack will occur in this portion due to thermal stress is reduced. Such a shape can also be applied to the second bent portion 21o. Further, as in the case where the heater wire 20 does not have the circumferential line portion 22 as in the example shown in FIGS. 2 to 4, the heater wire 20 can be applied regardless of the overall shape of the heater wire 20.

Comparing the example shown in FIGS. 5 and 6 with the example shown in FIGS. 7 and 8, both heater wires 20 include one meandering wire portion 21 and one circumferential wire portion 22 outside thereof. The shape of the first bent portion 21i (and the second bent portion 21o) of the meandering wire portion 21 is also a bent angular shape (U-shape). However, the connection form between the inner serpentine line portion 21 and the outer circumferential line portion 22 is different. In the heater wire 20 of the example shown in FIG. 5 and FIG. 6, the outer circumferential line portion 22 extends clockwise from one end connected to one of the two terminal electrodes 30 and extends around the through hole 11 substantially once. It surrounds and is connected to one end of the inner meandering wire portion 21 via a connecting wire portion 24. The meandering wire portion 21 also extends clockwise from the connecting wire portion 24 and surrounds the through hole 11 almost once, and the other end is connected to another terminal electrode 30. It can be said that the outer circumferential line portion 22 extends counterclockwise from the connecting line portion 24, and the inner meandering line portion 21 extends clockwise from the connecting line portion 24. Therefore, the entire shape of the heater wire 20 is spiral. On the other hand, in the heater wire 20 of the example shown in FIGS. 7 and 8, the circumferential line portion 22 extends clockwise from one end connected to one of the two terminal electrodes 30 to form the through hole 11. It is the same in that it surrounds almost one round and is connected to one end of the inner meandering wire portion 21 via a connecting wire portion 24. However, the meandering wire portion 21 extends counterclockwise from the connecting wire portion 24 and surrounds the through hole 11 almost once, and the other end is connected to another terminal electrode 30. The heater wire 20 is folded back at the connection wire portion 24. The outer circumferential line portion 22 and the inner meandering line portion 21, in other words, the two circumferential line portions 23 that are adjacent to each other on the inner side and the outer side are both counterclockwise from the connecting line portion 24 between them, that is, the same. It can be said that it extends in the direction.

The heater wire 20 of the example shown in FIGS. 9 and 10 is shown in FIGS. 5 to 8 in that the inner serpentine line portion 21 and the outer circumferential line portion 22 doubly surround the through hole 11. It is the same as the heater wire 20 in the example. However, while the circumferential line portion 22 in the examples shown in FIGS. 5 to 8 is one circular shape, in the examples shown in FIGS. 9 and 10, two semicircular circumferential line portions 22 are used. 221, 222 form one circular circumferential line portion 22. One end of the meandering wire portion 21 is connected to one end of one semicircular circumferential wire portion 221 by a connecting wire portion 24, and the other end of the meandering wire portion 21 has another semicircular shape. It is connected to one end of the circumferential line portion 222 of the above by a connecting line portion 24. The other end of one semicircular circumferential line portion 221 and the other end of the other semicircular circumferential line portion 222 are connected to different terminal electrodes 30, 30 by internal wiring 41. .. The meandering wire portion 21 extends clockwise from one end connected to one connecting wire portion 24, and one semicircular circumferential wire portion 221 connected to the same connecting wire portion 24 also has a connecting wire. It extends clockwise from section 24. Further, the meandering wire portion 21 extends counterclockwise from the other end portion connected to the other connecting wire portion 24, and has another semicircular circle connected to the same other connecting wire portion 24. The peripheral line portion 222 also extends counterclockwise from the connecting line portion 24. That is, also in this example, two peripheral line portions 23 (an outer peripheral line portion 22 (221, 222) and an inner meandering line portion 21) that are adjacent to each other inside and outside are connected to each other. It extends from the connecting wire portion 24 in the same direction.

The heater wire 20 in each of the examples shown in FIGS. 11 and 12 and the example shown in FIG. 13 has an inner meandering wire portion 21 and an outer double circumferential wire portion 22/22. In the heater wire 20 of the example shown in FIG. 11 and FIG. 12, the outer circumferential line portion 22 and the inner circumferential line portion 22 are connected by the connecting line portion 24, and the two circumferential line portions 22 and 22. All extend counterclockwise from the connecting line portion 24. Further, the inner circumferential line portion 22 and the inner serpentine line portion 21 extend clockwise from the connecting line portion 24 connecting them. In other words, two peripheral line portions 23 that are adjacent to each other on the inner side and the outer side (the outer peripheral line portion 22 and the two peripheral line portions 23 of the inner peripheral line portion 22 and the inner peripheral line portion 22 and the meandering line). The two peripheral line parts 23) of the part 21 extend in the same direction from the connecting line part 24 to which they are connected. On the other hand, in the heater wire 20 of the example shown in FIG. 13, the outer circumferential line portion 22 and the inner circumferential line portion 22 are not folded back at the connecting line portion 24 that connects them (the connecting line portion (The directions extending from 24 are opposite), and there is a double spiral circumferential line portion 22. Further, the inner circumferential line portion 22 and the meandering line portion 21 on the inner side thereof are also opposite in the direction in which they extend from the connecting line portion 24 connecting them, and the heater wire 20 has a triple spiral shape as a whole.

Each of the heater wires 20 in the examples shown in FIGS. 14 and 15 and the example shown in FIG. 16 has double meandering wire portions 21, 21. In the heater wire 20 of the example shown in FIG. 14 and FIG. 15, the two meandering wire portions 21, 21 located inside and outside are in the same direction (counterclockwise) from the connecting wire portion 24 to which they are connected. It is growing. On the other hand, in the heater wire 20 of the example shown in FIG. 16, the two meandering wire portions 21 and 21 extend in opposite directions (counterclockwise and clockwise) from the connecting wire portion 24 to which they are connected. And has a double spiral shape as a whole.

In this way, the heater wire 20 has a shape having a plurality of peripheral line portions 23 and surrounding the through hole 11 more than once, and the two peripheral line portions 23, 23 that are adjacent to each other on the inner side and the outer side are The heater 100 that extends in the same direction from the connection line portion 24 connecting these and surrounds the through hole 11 can be provided. When the heater wire 20 has a spiral shape, a large electromagnetic field is easily generated around the heater wire 20 when the heater wire 20 is energized. When the heater 100 is used in the camera module 600 as in the example shown in FIGS. 27 to 30, the circuit board 400 on which the image pickup device 300 is mounted is arranged at a position close to the heater 100. When a large electromagnetic field is generated around the heater wire 20 of the heater 100, the image captured by the image sensor 300 may be affected. Two circumferential line portions 23, 23 that are adjacent to each other on the inner side and the outer side (for example, the meandering line portion 21 on the inner side and the circumferential line portion 22 on the outer side thereof) extend in the same direction from the connecting line portion 24 connecting them. Since the direction of the electric current is opposite between the two peripheral line portions 23, a large magnetic field is not generated around the heater wire 20, and the possibility of affecting the image is reduced. That is, according to the heater 100 in which the two circumferential line portions 23 that are adjacent to each other on the inner side and the outer side extend in the same direction from the connecting line portion 24 that connects them, a large electromagnetic field is generated around the heater wire 20. Is less likely to occur, and a camera module 600 that is less likely to affect the image sensor 300 can be obtained.

Although the above example is an example of the heater 100 having one heater wire 20 inside one insulating substrate 10, the heater 100 having a plurality of heater wires 20 as in the examples shown in FIGS. You can In this example, the insulating substrate 10 has three insulating layers 10a, 10a, and 10a, and two heater wires 20 and 20 are arranged, one for each of the two layers. That is, the two heater wires 20 are arranged inside the insulating substrate 10 in the thickness direction. One of the two terminal electrodes 30 and 30 is connected to one end of one heater wire 20 of the two heater wires 20 and 20 by a through conductor 40 that penetrates one insulating layer 10a, and the other The terminal electrode 30 is connected to one end of the other heater wire 20 by a penetrating conductor 40 penetrating the two insulating layers 10a. The other ends of the two heater wires 20 and 20 (the meandering wire portions 21 and 21) are also connected to each other by the penetrating conductor 40 that penetrates the insulating layer 10a of one layer between them, and thus the two terminal electrodes. Two heater wires 20 and 20 are electrically connected in series between 30 and 30. As a result, the length of the heater wire 20 becomes longer, so that the heater 100 heats up in a shorter time.

Further, as in the example shown in FIGS. 17 to 20, each of the two heater wires 20 and 20 is composed of a meandering wire portion 21 and has a first bent portion 21i. The meandering pitch of the two heater wires 20, 20, that is, the pitch of the first bent portion 21i is the same. However, the positions of the first bent portions 21i do not match between the two heater wires 20 and 20 when seen in a plan view, and are displaced from each other. More specifically, in the example shown in FIGS. 17 to 20, the first bend of the other heater wire 20 is between two adjacent first bend portions 21i, 21i of the one heater wire 20 in plan view. The part 21i is located. As described above, the heater 100 includes a plurality of heater wires 20 in the thickness direction of the insulating substrate 10, and the first bent portions 21i of the plurality of heater wires 20 are displaced from each other in plan view. The first bent portions 21i of the heater wire 20 are arranged at predetermined intervals in the circumferential direction. As described above, the temperature in the vicinity of the bent portion (first bent portion 21i) is likely to be higher than that in other portions. If the first bent portions 21i are arranged at a predetermined interval in the circumferential direction, the temperature between the first bent portions 21i adjacent to each other becomes lower than that of the first bent portions 21i. On the other hand, there are a plurality of heater wires 20, and the first bent portion 21i of another heater wire 20 is located between two adjacent first bent portions 21i of the heater wire 20. Thus, the uniform heat distribution in the circumferential direction becomes higher. Therefore, the heater 100 can heat the lens 200 arranged in the through hole 11 more uniformly. Since the possibility that the lens 200 is distorted by uniform heating is reduced, it is possible to obtain the camera module 600 capable of capturing a high-quality image with little image distortion.

It can be said that the heater wire 20 of the example shown in FIGS. 17 to 20 also double- surrounds the through hole 11. The example shown in FIGS. 17 to 19 and the example shown in FIG. 20 differ from each other in the connection between the two meandering line portions 21 and 21 located in the thickness direction of the insulating substrate 10.

In the heater 100 of the example shown in FIGS. 17 to 19, one heater wire 20 (meandering wire portion 21) on the upper side (the surface side of the insulating substrate 10 on which the terminal electrodes 30 are provided) is one of the two. Extends from one end connected to the terminal electrode 30 in the clockwise direction and surrounds the through hole 11 almost once, and the other end is below the through conductor 40 (the surface side of the insulating substrate 10 where the terminal electrode 30 is not provided). Is connected to one end of another heater wire 20 (meandering wire portion 21). The other meandering wire portion 21 on the lower side extends counterclockwise from one end connected to the penetrating conductor 40 and surrounds the penetrating hole 11 almost once, and the other end is connected to another terminal electrode 30. The two heater wires 20 and 20 (the meandering wire portions 21 and 21) adjacent to each other in the thickness direction of the insulating substrate 10 extend in the counterclockwise direction, that is, in the same direction from the penetrating conductor 40 that is the connecting portion between them. It can be said that

On the other hand, in the heater 100 of the example shown in FIG. 20, one heater wire 20 (the meandering wire portion 21) on the upper side extends clockwise from one end connected to one of the two terminal electrodes 30 and penetrates the heater wire 20. The hole 11 is surrounded by almost one round, and the other end is connected to one end of another heater wire 20 (meandering wire portion 21) located below by a through conductor 40. The other lower heater wire 20 (meandering wire portion 21) extends clockwise from one end connected to the through conductor 40 and surrounds the through hole 11 almost once, and the other end is connected to another terminal electrode 30. Has been done. When the upper and lower two heater wires 20 and the penetrating conductor 40 between them are regarded as one heater wire, the entire heater wire has a spiral shape.

If the heater wire 20 has a spiral shape as described above, a large electromagnetic field is likely to be generated in the heater wire 20 when the heater wire 20 is energized. The same applies to the case of a spiral that is a spiral in the thickness direction. On the other hand, as in the example shown in FIGS. 17 to 19, the end portions of the two heater wires 20 that are adjacent to each other in the thickness direction of the insulating substrate 10 are connected by the penetrating conductor 40. It is possible to form the heater 100 in which the two heater wires 20 and 20 extend from the through conductor 40 in the same direction and surround the through hole 11. With such a configuration, the directions of the electric currents are opposite between the two heater wires 20 and 20, so that a large magnetic field is less likely to be generated around the two heater wires 20 and 20, and the image sensor It is possible to obtain the camera module 600 that is unlikely to affect the 300. The heater wire 20 in the example shown in FIGS. 17 to 19 does not surround the through hole 11 in multiple layers in one layer, but the heater wire 20 surrounding the through hole 11 in multiple layers in one layer has a thickness of the insulating substrate 10. It is also possible to use the heater 100 having a plurality of heaters in the direction. When the two heater wires 20 that are adjacent to each other in the thickness direction extend in the same direction from the through conductor 40 that connects them, even if the heater wire 20 between one layer is spiral, a large magnetic field is generated. The heater 100 is less likely to generate.

If the heater 100 is such that the portion near the through hole 11 is heated in a shorter time, the lens 200 in the through hole 11 can be heated in a shorter time. As a means other than the method of arranging the heater wire 20 in the insulating substrate 10 as described above, there is a heater wire 20 in which a portion of the heater wire 20 near the through hole 11 is heated in a shorter time.

The heater wire 20 in the example shown in FIG. 19 has the same width W and the same thickness T regardless of its position. Specifically, the line width Wi1 of the first bent portion 21i and the line width Wo1 of the second bent portion 21o in the upper heater wire 20 are the same. Further, the line width Wi2 of the first bent portion 21i and the line width Wo2 of the second bent portion 21o in the lower heater wire 20 are the same. The line width W1 of the upper heater wire 20 and the line width W2 of the lower heater wire 20 are the same. Further, the thickness Ti1 of the first bent portion 21i and the thickness To1 of the second bent portion 21o of the upper heater wire 20, the thickness Ti2 of the first bent portion 21i of the lower heater wire 20 and the thickness To2 of the second bent portion 21o of the lower heater wire 20. Is the same as.

On the other hand, as in the example shown in FIGS. 21 and 22, the first bent portion 21i may be the heater 100 having the narrow portion 21n having a width smaller than the line width of the second bent portion 21o. it can. The narrow portion 21n having a small line width has a large electric resistance per unit length and is likely to heat up in a shorter time. Since the narrowed portion 21n is in the first bent portion 21i arranged along the through hole 11, the portion near the through hole 11 becomes the heater 100 that heats up in a shorter time, and the lens 200 in the through hole 11 is It can be heated in a shorter time. Note that, in the plan views of FIGS. 21 and 22, the narrow portion 21n is shaded in a dot shape for easy distinction.

The thicknesses Ti1 and Ti2 of the first bent portion 21i and the thicknesses To1 and To2 of the second bent portion 21o in the examples shown in FIGS. 21 and 22 are the same as the thickness of the heater wire 20 in the example shown in FIG. The line widths Wo1 and Wo2 of the second bent portion 21o are the same as the line width of the heater wire 20 in the example shown in FIG. In the example shown in FIG. 21, the portion extending in the circumferential direction of the first bent portion 21i is a narrow portion 21n having a width smaller than the line widths Wo1 and Wo2 of the second bent portion 21o. In the example shown in FIG. 22A, when the radial length from the inner peripheral edge to the outer peripheral edge of the heater wire 20 is L, the portion from the inner peripheral edge to the position L/4 is a narrow portion. 21n, and the entire first bent portion 21i is a narrowed portion 21n. In the example shown in FIG. 22B, the portion from the inner peripheral end of the heater wire 20 to the position L/2 in the radial direction is the narrowed portion 21n, and includes the first bent portion 21i and the first bent portion 21i. It's a big part. As described above, it is sufficient that a part of the narrow portion 21n is in the first bent portion 21i. When the narrow portion 21n is provided at the inner peripheral end portion near the through hole 11, the lens 200 in the through hole 11 can be heated in a shorter time.

In the example shown in FIG. 22, the line width of the heater wire 20 is gradually reduced from the second bent portion 21o to the first bent portion 21i. In the heater wire 20, only the narrow portion 21n has a small line width, and the heater wire 20 may have a stepped shape at the boundary with other portions. If the heater wire 20 has a shape in which the line width is gradually reduced, there is no portion where the temperature difference in the heater wire 20 is large, and the stress applied to the insulating substrate 10 due to the temperature difference is small. It is possible to reduce the possibility that a problem such as occurrence of a problem will occur.

Further, as in the example shown in FIG. 23, the heater 100 may have the first bent portion 21i having a thin portion 21t having a thickness smaller than the thickness of the second bent portion 21o. The thin portion 21t having a small thickness has a large electric resistance per unit length and is likely to be heated in a shorter time. Since the thin portion 21t is in the first bent portion 21i arranged along the through hole 11, the portion close to the through hole 11 becomes the heater 100 that heats up in a shorter time, and the lens 200 in the through hole 11 is It can be heated in a shorter time. Note that, in the plan view of FIG. 23, the thin portions 21t are shaded in a dot shape for easy distinction.

The line widths Wi1 and Wi2 of the first bent portion 21i and the line widths Wo1 and Wo2 of the second bent portion 21o of the example shown in FIG. 23 are the same as the line width of the heater wire 20 of the example shown in FIG. Further, the thicknesses To1 and To2 of the second bent portion 21o are the same as the thickness of the heater wire 20 in the example shown in FIG. In the example shown in FIG. 23, the portion extending in the circumferential direction of the first bent portion 21i is a thin portion 21t having a smaller thickness than the thicknesses To1 and To2 of the second bent portion 21o. When the radial length from the inner peripheral edge to the outer peripheral edge of the heater wire 20 is L, the same portion as the narrow portion shown in FIGS. 12A and 12B may be the thin portion 2t. That is, it is a portion from the inner circumferential end to the position L/4 or a portion from the inner circumferential end of the heater wire 20 to the position L/2 in the radial direction. As described above, a part of the thin portion 21t may be in the first bent portion 21i. If the thin portion 21t is provided at the inner peripheral end near the through hole 11, the lens 200 in the through hole 11 can be heated in a shorter time.

In the example shown in FIG. 23, the thickness of the heater wire 20 gradually increases from the intermediate portion between the first bent portion 21i and the second bent portion 21o (position L/2 from the inner peripheral end of the heater wire 20) to the thin portion 21t. It is getting smaller. The heater wire 20 may have a shape in which only the thin portion 21t has a small thickness and a step is formed at the boundary with the other portion of the heater wire 20. When the heater wire 20 has a shape in which the thickness is gradually reduced, there is no portion where the temperature difference in the heater wire 20 is large, and the stress applied to the insulating substrate 10 due to the temperature difference is small. The possibility that problems such as occurrence will occur is reduced.

As in the example shown in FIGS. 24 and 25, the heater 100 may have a space Si between the heater wires 20 in the first bent portion 21i that is smaller than the space So between the heater wires 20 in the second bent portion 21o. As described above, the temperature of the portion of the heater 100 surrounded by the heater wires 20 on three sides is likely to be higher than that of the other portions. For example, the first bent portion 21i in the example shown in FIG. 24 has a portion located at the inner end of the heater wire 20 and extending in the circumferential direction of the insulating substrate 10, and a portion extending from both ends of this portion in the radial direction of the insulating substrate 10. The temperature of the portion surrounded by these tends to rise. The spacing Si between the heater wires 20 in the first bent portion 21i in this example is the spacing Si between the two portions extending in the radial direction. The first bent portion 21i in the example shown in FIG. 25 is curved and bent in an arc shape, and has portions extending in the radial direction of the insulating substrate 10 from both ends of the arc portion. The portion extending in the radial direction is connected to the second bent portion 21o. In the case of this example, the temperature easily rises in the portion inside the arc-shaped portion. The spacing Si between the heater wires 20 in the first bent portion 21i in this example is the spacing Si between two portions extending in the radial direction from both ends of the arcuate portion, and this spacing Si is equal to the inner diameter of the arcuate portion. Is. The smaller the distance Si between the radially extending portions of the heater wire 20, the higher the temperature. Therefore, if the spacing Si between the heater wires 20 in the first bent portion 21i is smaller than the spacing So between the heater wires 20 in the second bent portion 21o, the portion close to the through hole 11 becomes the heater 100 that heats up in a shorter time, The lens 200 in the through hole 11 can be heated in a shorter time.

27 to 30, the camera module 600 includes the heater 100 having the above configuration, the lens 200 that overlaps with the heater 100 and is thermally connected, and the imaging element 300. According to such a camera module 600, since the heater 100 as described above is provided, it is possible to remove the fogging of the lens 200 and the ice or the like adhering to the lens 200 in a short time.

The heater 100, the lens 200, and the image sensor 300 are housed in a housing 500. The case 500 of the example shown in FIG. 27 is a box type having a space for housing the lens 200 and the like therein, and has an opening 501 on one surface.

The lens 200 is disposed so as to close the opening 501 of the housing 500, for example. A packing, an adhesive, or the like may be interposed between the lens 200 and the housing 500 to prevent moisture or the like from entering the inside of the housing 500. The lens 200 overlaps the heater 100 and is thermally connected. In the example shown in FIG. 28, the lens 200 is arranged in the through hole 11 of the heater 100, and the lens 200 overlaps the heater 100 in the thickness direction. Further, the inner surface of the through hole 11 of the heater 100 and the outer surface of the lens 200 are in contact with each other and are thermally connected. An adhesive may be interposed between the heater 100 and the lens 200, and the heater 100 and the lens 200 may be connected thermally and mechanically via the adhesive. The heater 100 is fixed, for example, by fitting it into the housing 500, or by joining with an adhesive or the like.

The image sensor 300 is arranged at a position where the light transmitted through the lens 501 through the opening 501 and entering the housing 500 can be received. In other words, the lens 200 is located between the opening 501 of the housing 500 and the image sensor 300. In the example shown in FIG. 28, the image sensor 300 is mounted on the circuit board 400, and the circuit board 400 is positioned and fixed to the housing 500. The circuit board 400 can be fixed to the housing 500 by, for example, a method such as joining and fixing with an adhesive, fixing with screws, or the like. In the example shown in FIG. 28, the terminal electrode 30 of the heater 100 is electrically connected to the electrode of the circuit board 400 via the connection member 410. As the connection member 410, a lead wire, a flexible wiring board, or the like can be used.

Electronic components 430 other than the image sensor 300 may be mounted on the circuit board 400. In the example shown in FIG. 28, the electronic component 430 is mounted on the surface opposite to the surface on which the image sensor 300 is mounted. The electronic component 430 is, for example, an active element such as an LSI (Large Scale Integrated circuit) for performing image processing of an image picked up by the image pickup element 300 or for controlling operation of the image pickup element 300 and the heater 100. , Passive elements such as capacitors and resistors.

A cable 420 is connected to the circuit board 400, and the cable 420 is drawn out of the housing. When the camera module 600 is used as an in-vehicle camera, for example, the cable 420 is connected to an ECU (Electronic Control Unit) of the vehicle. Then, the image captured by the camera module 600 is displayed on the monitor connected to the ECU and arranged in the vehicle compartment.

The supply of the voltage for causing the heater 100 to generate heat is performed via the connection member 410 connected to the terminal electrode 30 of the heater 100. The electronic component 430 in the camera module 600 or the ECU of the vehicle can determine based on the image captured by the image sensor 300, the outside temperature, or the like, and apply a voltage to the heater 100. Alternatively, the driver who sees the image displayed on the monitor can apply a voltage to the heater 100 by operating a switch in the vehicle compartment connected to the ECU or the camera module 600.

The camera module 600 shown in FIGS. 29 and 30 differs from the example shown in FIG. 28 in the shape of the lens 200 and the connection form between the lens 200 and the heater 100. Other configurations are the same as the example shown in FIG.

The lens 200 in the camera module 600 of the example shown in FIG. 29 overlaps in the thickness direction of the heater 100, and about half the thickness of the lens 200 enters the through hole 11 of the heater 100. The through hole 11 of the heater 100 in this example has a shape in which the side of the opening 501 of the housing 500, that is, the side on which the lens 200 overlaps, expands, and the inner side surface of this expanding portion is the side opposite to the opening 501 of the lens 200. Is in contact with the peripheral edge of the surface. Further, the portion of the through hole 11 (inside surface thereof) where the lens 200 does not enter and the outer edge portion of the lower surface of the lens 200 are joined by an adhesive agent 110. The lens 200 is thermally connected to the heater 100 by contact with the upper portion of the through hole 11 and adhesion with the lower portion of the through hole 11. The adhesive 110 may be interposed between the lens 200 and the upper portion of the through hole 11.

The lens 200 in the camera module 600 of the example shown in FIG. 30 has a large diameter portion that is larger than the through hole 11 of the heater 100 and a small diameter portion that is approximately the same size as the through hole 11. The outer edge of the large diameter portion of the lens 200 overlaps the main surface of the heater 100 on the opening 501 side, and the small diameter portion enters the through hole 11 of the heater 100. The lens 200 is thermally connected to the heater 100 by contact with the main surface of the heater 100 and the inner surface of the through hole 11. The adhesive 110 may be interposed between the lens 200 and the heater 100.

Each part of the heater 100 and the camera module 600 as described above, and an example of the manufacturing method will be described in more detail below.

The insulating substrate 10 is a basic part of the heater 100, and has the through hole 11 in the center thereof, so that the heat from the heater wire 20 built in the lens 200 arranged inside thereof is transferred. Functions as a heat body. The insulating substrate 10 also functions as an electrical insulator for electrically disposing the plurality of terminal electrodes 30 and the like.

The insulating substrate 10 is, for example, an annular plate body in plan view (top view). Normally, the inner surface of the through hole 11, which is a portion that is thermally connected to the outer edge portion of the lens 200 having a circular shape in a plan view, is circular, so that the lens 200 is uniformly heated in the circumferential direction. You can The outer shape of the insulating substrate 10 is circular in the example shown in FIGS. For example, it may be a polygon such as a square, a hexagon, or an octagon. When the outer shape of the insulating substrate 10 is circular, when a part of the heat of the heater wire 20 inside is transferred to the outer surface and is radiated, the distance from the outer edge portion of the heater wire 20 to the outer surface is substantially constant. Since the heat transfer to the outer side surface is uniform in the circumferential direction, the heat uniformity inside the heater 100 is also improved. The outer shape of the insulating substrate 10 is not limited to a strict circle as in the example shown in FIGS. 1 to 3, but a circular portion (4 places) is cut out as shown in FIGS. What is provided, what is partially projected from a circle to provide a flat surface portion as in the example shown in FIG. 7, and a circular portion is cut out to form a flat surface portion as in the examples shown in FIGS. 17 and 18. At the same time, it is possible to make it a circular shape provided with a protruding portion in order to lengthen the flat portion. The cutouts and protrusions of the circular insulating substrate 10 having such a flat portion are smaller than the outer diameter of the insulating substrate 10, so that the insulating substrate 10 has a uniform outer shape as in the case of a circular outer shape. It has high heat resistance. In addition, such a circular heater 100 having a flat surface on the outer surface facilitates alignment with the housing 500 and the like of the camera module 600 by the flat surface.

The size of the insulating substrate 10 is set according to the size of the lens 200 to be heated. When the insulating substrate 10 is, for example, circular in plan view (top view), for example, the dimensions in plan view are an outer diameter of 8 mm to 30 mm, an inner diameter of 6 mm to 26 mm, and a thickness of 0.3 mm to, for example. It is 1.5 mm.

The insulating substrate 10 is formed by laminating a plurality of insulating layers 10a as in the example shown in FIGS. The insulating layer 10a, that is, the insulating substrate 10 is made of ceramics. The insulating substrate 10 is formed of, for example, a ceramic sintered body such as an aluminum oxide sintered body, a glass ceramic sintered body, an aluminum nitride sintered body, or a mullite sintered body. If the insulating substrate 10 is made of, for example, an aluminum oxide sintered body, it can be manufactured as follows. First, a raw material powder such as aluminum oxide and silicon oxide is molded into a sheet shape together with an appropriate organic binder and an organic solvent to produce a square sheet-shaped ceramic green sheet. Thereafter, the ceramic green sheets are cut into appropriate dimensions and formed into a plurality of laminated ceramic green sheets, and the laminated body is fired at a temperature of 1300 to 1600° C. to manufacture the insulating substrate 10. .. Each of the plurality of fired ceramic green sheets becomes the insulating layer 10a forming the insulating substrate 10.

The heater wire 20 can be formed of a metallized layer formed by co-firing with a ceramic green sheet. The metallizing paste may be applied to a predetermined position of the ceramic green sheet in a predetermined shape by screen printing, for example. The metallizing paste is mainly composed of a powder of a metal material such as tungsten, molybdenum, copper, silver, palladium, gold, platinum, nickel or cobalt, or an alloy material containing these metal materials, and a solvent or an organic binder. It is contained. The metallizing paste may contain powder of ceramics, glass or the like in order to adjust the electric resistance value or the firing shrinkage ratio. The size and shape of the heater wire 20 are set by adjusting the type and blending ratio of the metallizing paste material according to the required amount of heat generation. The narrow portion 21n of the heater wire 20 can be formed by the pattern shape of the printing plate. The heater wire 20 having the thin portion 21t can be formed, for example, by overlapping and printing a portion other than the thin portion 21t a plurality of times.

The terminal electrode 30 is provided on the surface of the insulating substrate 10. In the example shown in FIGS. 2 to 4 and the example shown in FIGS. 17 to 19, two terminal electrodes 30 are provided on one of the main surfaces of the insulating substrate 10 where the through holes 11 are open. The arrangement and size of the terminal electrode 30 can be appropriately set according to the arrangement of other members of the camera module 600, the size of the heater 100, and the like. For example, as in the example shown in FIGS. 5 and 6, the two terminal electrodes 30, 30 can be provided one each on different main surfaces of the insulating substrate 10. Alternatively, as in the example shown in FIGS. 14 to 16, the two terminal electrodes 30 and 30 (the pair of terminal electrodes 30 and 30 connected to both ends of the heater wire 20) are connected to one main surface of the insulating substrate 10 and the other. Can be provided on both of the main surfaces respectively. Further, as in the example shown in FIGS. 7 and 8, from one main surface to the outer surface of the insulating substrate 10, or as in the examples shown in FIGS. 9 to 13, one main surface passes through the side surface and the other main surface. It can also be provided over the surface. In any case, all or some of the two terminal electrodes 30 are provided on the main surface of the insulating substrate 10.

When two terminal electrodes 30 and 30 (a pair of terminal electrodes 30 and 30) are provided on both one main surface and the other main surface of the insulating substrate 10 as in the example shown in FIGS. It can be incorporated in the camera module 600 regardless of the orientation of the main surface of the heater 100. When the pair of terminal electrodes 30, 30 is provided from one main surface of the insulating substrate 10 to the other main surface through the side surface, the heater wire 20 is connected to the terminal as in the example shown in FIGS. 9 and 10. It can be connected to a portion on the side surface of the electrode 30. Alternatively, as in the examples shown in FIGS. 11 and 12, the heater wire 20 can be connected to either one of the main surfaces of the terminal electrodes 30 or 30 or the other main surface thereof. As in the example shown in FIG. 13, the heater wire 20 can be connected to both the part on one main surface and the part on the other main surface of the terminal electrodes 30. When the pair of terminal electrodes 30, 30 are provided on both main surfaces of the insulating substrate 10 instead of being provided on the side surfaces thereof, as in the example shown in FIGS. , The pair of terminal electrodes 30 and 30 provided on one main surface of the insulating substrate 10 and the pair of terminal electrodes 30 and 30 provided on the other main surface of the insulating substrate 10.

When a part of the pair of terminal electrodes 30 is also provided on the side surface of the insulating substrate 10, the end portion of the heater wire 20 is connected to the terminal electrode 30 by the internal wiring 41 as in the example shown in FIGS. -Can be connected to 30. Even when a part of the pair of terminal electrodes 30 is also provided on the side surface of the insulating substrate 10, the end portion of the heater wire 20 and the pair of terminal electrodes 30 are provided as in the example shown in FIGS. 11 to 13. It is possible to connect 30 with the through conductor 40. When a pair of terminal electrodes 30 and 30 are provided from one main surface to the side surface to the other main surface as in the example shown in FIGS. 9 to 13, the end portion of the heater wire 20 has the terminal electrode 30. It may be connected to any one of the part on one main surface, the part on the side surface and the part on the other main surface. In the example shown in FIGS. 9 and 10, the end portion of the heater wire 20 and the portion on the side surface of the terminal electrode 30 are connected. In the example shown in FIGS. 11 and 12, the end portion of the heater wire 20 is connected to the portion on one main surface of the terminal electrode 30. In the example shown in FIG. 13, the end portion of the heater wire 20 is connected to the portion on one main surface and the portion on the other main surface of the terminal electrode 30. Although not shown, the end portion of the heater wire 20 and the portion on the other main surface of the terminal electrode 30 can be connected. Alternatively, one of the two ends of the heater wire 20 is connected to a portion on one main surface of the terminal electrode 30, and the other one of the two ends of the heater wire 20 and the terminal electrode 30 are connected. It is also possible to connect with the part on the other main surface of. Alternatively, the end of the heater wire 20 can be connected to each of the part on one main surface, the part on the side surface, and the part on the other main surface of the terminal electrode 30.

The terminal electrode 30 can also be formed with the same material and method as the heater wire 20. Alternatively, the two terminal electrodes 30, 30 can be formed of a thin film by vapor deposition or the like. Further, a metal coating such as Ni/Au can be formed on the surfaces of the two terminal electrodes 30 by plating. This suppresses corrosion of the two terminal electrodes 30 and improves the connectivity of the connection member 410.

In the above-described example, the two terminal electrodes 30, 30 are arranged on the surface of the insulating substrate 10 or close to each other in plan view, regardless of how many heater wires 20 are stacked. .. Therefore, the heater wires 20 have substantially the same number of surroundings in the circumferential direction along the through-holes 11, so that the heat uniformity in the circumferential direction is high. For example, if the two terminal electrodes 30, 30 are arranged on opposite sides of the through hole 11, the heater wire 20 surrounds the through hole 11 by 1.5 or 2.5 weights. The number of the heater wires 20 located outside the hole 11 may be one and two, or two and three. As a result, the half of the heater 100 and the other half have different heat generation amounts. Since the two terminal electrodes 30 are arranged close to each other, the density of the heater wires 20 in the insulating substrate 10 becomes uniform in the circumferential direction of the through holes 11, and the heat uniformity is improved.

In the example shown in FIGS. 1 to 6 and FIGS. 11 to 20, the heater wire 20 and the terminal electrode 30 are electrically connected by the through conductor 40 as described above, and the heater 100 is arranged in the thickness direction of the insulating substrate 10. When a plurality of heater wires 20 are provided in the two, the two heater wires 20, 20 adjacent to each other in the thickness direction are also electrically connected by the through conductor 40. If at least a part of the terminal electrode 30 is provided on the outer side surface of the insulating substrate 10 as in the example shown in FIGS. 7 to 10, the heater wire 20 is provided between the insulating layers 10 a. The internal wire 41 can connect the heater wire 20 and the terminal electrode 30 on the outer surface. The through conductor 40 may be formed by forming a through hole in the ceramic green sheet by punching with a mold or laser processing, and filling the through hole with the same metallizing paste as described above.

The lens 200 is made of a translucent material such as glass or resin. The lens 200 of the camera module 600 of the examples shown in FIGS. 27 to 30 is composed of one lens, but may be composed of a plurality of lenses. In this case, the heater 100 may be thermally connected to at least one lens, for example, the outermost lens located near the opening 501 of the housing 500. The shape, number and arrangement of the lenses 200 can be set according to the characteristics required for the camera module 600.

For the adhesive 110 that joins the heater 100 and the lens 200, a resin adhesive containing an epoxy resin or the like as its main component can be used. The adhesive 110 may include particles of metal or ceramics having a higher thermal conductivity than that of a resin material and having an increased thermal conductivity. The heating of the lens 200 by the heater 100 can be performed in a shorter time.

The image sensor 300 may be a CCD (Charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor), or the like. The number of pixels and size of the image sensor 300 can be selected according to the characteristics required for the camera module 600.

The circuit board 400 is an insulating plate made of ceramics or resin provided with electrodes and wirings to which the image pickup device 300 and the like are connected.

The housing 500 is made of resin such as epoxy resin. The outer shape of the housing 500 is a rectangular parallelepiped shape in the camera module 600 of the example shown in FIG. 27, but the shape of the housing 500 is not limited to this, and the camera module 600 such as a cylinder (cylindrical) is installed. The shape can be set according to the position of the lens 200 or the arrangement of the lens 200 or the like in the housing 500.

10... Insulating substrate 10a... Insulating layer 11... Through hole 12... Surface 20... Heater wire 21... Meandering wire portion 21i... First bent portion 21o... Second Bent portion 21n...Narrow portion 21t...Thin portion 22...Circular line portion 23...Circular line portion 24...Connection line portion 30...Terminal electrode 40...Penetrating conductor 41. .. Internal wiring 100... Heater 110... Adhesive 200... Lens 300... Imaging element 400... Circuit board 410... Connection member 420... Cable 430... Electronic component 500 ...Case 501...Opening 600...Camera module

Claims (8)

An insulating substrate having a through hole,
A heater wire provided so as to surround the through hole inside the insulating substrate;
Connected to the heater wire, comprising a terminal electrode provided on the surface of the insulating substrate,
The heater wire includes a meandering wire portion that is repeatedly bent with a first bent portion located inside the insulating substrate and a second bent portion located outside the insulating substrate, and the first bent portion of the meandering wire portion. A heater whose parts are arranged along the through holes of the insulating substrate. The heater according to claim 1, wherein the first bent portion has a narrowed portion having a width smaller than a line width of the second bent portion. The heater according to claim 1 or 2, wherein the first bent portion has a thin portion having a thickness smaller than a thickness of the second bent portion. The heater according to claim 1, wherein an interval between the heater wires in the first bent portion is smaller than an interval between the heater wires in the second bent portion. The heater wire has a plurality of peripheral line portions that surround the through hole, including the meandering line portion that is closest to the through hole, and has a shape that surrounds the through hole in a double or more shape. The heater according to any one of claims 1 to 4, wherein two adjacent peripheral line portions extend in the same direction from a connecting line portion connecting them and surround the through hole. A plurality of the heater wires are provided in a thickness direction of the insulating substrate, and the positions of the first bent portions of the plurality of the heater wires are displaced from each other when seen in a plan view. Heater. The end portions of the two heater wires adjacent to each other in the thickness direction of the insulating substrate are connected by a through conductor, and the two heater wires extend in the same direction from the through conductor and surround the through hole. The heater according to claim 6, wherein: A camera module comprising: the heater according to any one of claims 1 to 7; a lens that overlaps with the heater and is thermally connected; and an image sensor.

Images