JP2023157249A - Imaging apparatus - Google Patents

Abstract

To provide an imaging apparatus that can achieve a configuration with a high heat radiation effect, while preventing an increase in load when a heat radiation member is displaced.SOLUTION: In an imaging apparatus of the present invention, when seen from an optical axis orthogonal direction, a first heat radiation sheet 801 has a bent part in a space between a movable unit 200a and a second heat radiation sheet 802, and the second heat radiation sheet 802 is adhered to the first heat radiation sheet 801 and a heat radiation plate 700, and when seen from an optical axis orthogonal direction, the second heat radiation sheet 802 has a bent part in a space between the first heat radiation sheet 801 and the heat radiation plate 700.SELECTED DRAWING: Figure 10

Description

The present invention relates to an imaging device in which a displaceable movable unit and a heat radiating member are connected.

2. Description of the Related Art Conventionally, electronic devices such as imaging devices are known that have a board wiring structure in which a movable unit that is displaceably supported by a fixed unit (support unit) and a control board are connected by a flexible board.

For example, in an imaging device that has a function of optically correcting subject blur, the subject blur is corrected by displacing a movable unit that supports the image sensor relative to a fixed unit in a direction perpendicular to the optical axis. Ru.

A circuit board on which an image sensor is mounted is mounted on the movable unit, and electrical connection parts such as a connector are also mounted on this circuit board.

A control board for driving and controlling the movable unit is mounted on the side of a fixed unit such as a casing that holds the movable unit, and electrical connection parts such as connectors are also mounted on this control board.

The connector on the movable unit side and the connector on the fixed unit side are electrically connected by a flexible printed circuit board.

Utilizing the flexibility of the flexible printed circuit board, the fixed unit and the movable unit are electrically connected, and the movable unit is driven and controlled by the control board.

A drive circuit for an image sensor has a large electrical load and generates a large amount of heat, so that as the temperature of the image sensor increases, dark current increases, causing deterioration of image quality.

Furthermore, in order to obtain a clear image, it is necessary to maintain the mounting accuracy of the solid-state image sensor to approximately several μm, and it is also necessary to consider the effects of dimensional changes due to mechanical stress and heat during mounting.

Conventionally, as a cooling method for an image sensor, a heat dissipating member with good thermal conductivity is provided on the back side of the image sensor or electronic components on the image sensor board, and the heat generated in the drive circuit is transferred to the camera casing via the heat member. There are known methods for dissipating heat.

As this heat dissipation member, a highly rigid material such as a graphite sheet, a copper plate, an aluminum plate, or a heat dissipation resin member such as heat conductive rubber is used.

Also known are methods of discharging heat into the surrounding atmosphere via heat radiation fins, and methods of cooling an image sensor by heat absorption during vaporization of a liquid using a heat pipe or a vapor chamber.

When an image sensor is mounted on a movable unit, a heat dissipation member such as a flexible graphite sheet is usually provided in order to cool the image sensor, similar to a flexible printed circuit board.

Patent Document 1 discloses an imaging device in which a fixed unit and a movable unit are electrically connected and a flexible heat radiating member is connected to cool an imaging element.

WO2020/202811 publication

The heat radiating member is deformable according to the displacement of the movable unit.

However, the reaction force generated by the deformation of the heat radiating member becomes a load when driving the movable unit.

If the flexibility of the heat dissipation member is low, there is a possibility that driving of the movable unit will be inhibited.

Therefore, the heat dissipation member is preferably formed of a thin layer in order to increase flexibility. Therefore, it is made of a highly flexible member such as a graphite sheet.

In recent years, the power consumption of image sensors has tended to increase due to improvements in the functions of imaging devices, such as higher pixel resolution for moving images and high-speed continuous shooting.

In other words, the image sensor generates a large amount of heat, and instead of using a graphite sheet, a member that uses the movement of working fluid to transfer heat, such as a heat pipe or vapor chamber, which is a member with a higher heat dissipation effect from the movable unit, is used as a heat dissipation member. There is a need to dissipate heat.

However, when a highly rigid material such as a heat pipe or a vapor chamber is used for the heat dissipation member, the controllability of image blur correction deteriorates because the drive of the movable unit is obstructed.

Furthermore, stress during assembly and expansion due to heat are expected to adversely affect image quality, such as deteriorating the mounting accuracy of the image sensor.

An object of the present invention is to provide an electronic device that can be configured to have a high heat dissipation effect while suppressing an increase in load when a heat dissipation member is displaced.

In order to achieve the above object, an imaging device of the present invention includes an imaging device and a device that can be displaced in a direction different from the optical axis of an imaging optical system in order to hold the imaging device and correct image blur. a movable unit, a heat dissipation plate that dissipates heat generated by the image sensor, a first heat dissipation sheet connected to the movable unit, and a second heat dissipation sheet that connects the first heat dissipation sheet and the heat dissipation plate. An imaging device having:
When viewed from a direction perpendicular to the optical axis, the first heat dissipation sheet has a bent portion in a space between the movable unit and the second heat dissipation sheet,
The second heat dissipation sheet is adhered to the first heat dissipation sheet and the heat dissipation plate, and
When viewed from a direction perpendicular to the optical axis, the second heat dissipation sheet has a bent portion in a space between the first heat dissipation sheet and the heat dissipation plate.

The imaging device of the present invention also includes an imaging device, a movable unit that holds the imaging device and is movable in a direction different from the optical axis of the imaging optical system in order to correct image blur, and the imaging device. An imaging device comprising: a heat dissipation plate that dissipates heat generated in an element; a first heat dissipation sheet connected to the heat dissipation plate; and a second heat dissipation sheet that connects the first heat dissipation sheet and the movable unit. And,
When viewed from a direction perpendicular to the optical axis, the first heat dissipation sheet has a bent portion in a space between the heat dissipation plate and the second heat dissipation sheet,
The second heat dissipation sheet is different from the first heat dissipation sheet and is adhered to the movable unit, and
When viewed from a direction perpendicular to the optical axis, the second heat dissipation sheet has a bent portion in a space between the first heat dissipation sheet and the movable unit.

According to the present invention, it is possible to provide an electronic device that can be configured to have a high heat radiation effect while suppressing an increase in load when a heat radiation member is displaced.

FIG. 1 is a perspective view of an electronic device according to an embodiment. FIG. 1 is an exploded perspective view showing main parts of an electronic device according to an embodiment. FIG. 2 is an exploded perspective view of an image blur correction unit according to an embodiment. FIG. 4 is an exploded perspective view showing the image blur correction unit from a different direction from FIG. 3; It is a front view of the 2nd connection member concerning a 1st embodiment. FIG. 2 is a perspective view of an image blur correction unit according to the first embodiment. FIG. 8 is a cross-sectional view of a first heat radiating member 801 and a second heat radiating member 802 according to the first embodiment. This is a general layer configuration of the second heat dissipation member 802 according to the first embodiment. FIG. 2 is a perspective view of an image blur correction unit according to the first embodiment. FIG. 2 is a perspective view of an image blur correction unit according to the first embodiment. FIG. 2 is a perspective view of an image blur correction unit according to the first embodiment. FIG. 8 is a cross-sectional view of a first heat radiating member 801 and a second heat radiating member 802 according to the first embodiment. FIG. 2 is a block diagram according to the first embodiment.

Embodiments of the present invention will be described in detail below with reference to the drawings. In each embodiment, an imaging device is shown as an example of an electronic device to which the structure of the heat dissipation member according to the present invention is applied.

[First embodiment]
(Perspective view of imaging device 10)
FIG. 1 is a perspective view of an imaging device 10.

Regarding the direction of the imaging device 10, the subject side is defined as the front side based on the direction seen from the photographer (user), and the up-down direction, front-back direction, and left-right direction as seen from the user who directly faces the back of the imaging device 10. Define each.

Therefore, FIG. 1(A) is a perspective view of the imaging device 10 when viewed from the front side, and FIG. 1(B) is a perspective view of the imaging device 10 when viewed from the rear side.

In this embodiment, an interchangeable lens camera in which a lens device can be attached to a camera body is shown as an example of application to an imaging device, but the present invention is also applicable to a camera in which a camera body and a lens unit are integrated.

The imaging device 10 includes an exterior portion 10c, and the exterior portion 10c is composed of a plurality of members. The imaging device 10 includes a mount 10a on the front side, and an unillustrated interchangeable lens (lens device) can be attached to the mount 10a.

The axis passing through the center of the mount 10a substantially coincides with the optical axis P (see the dashed line) of the imaging optical system of the interchangeable lens, that is, the imaging optical axis.

(An exploded perspective view of the imaging device 10)
FIG. 2 is an exploded perspective view of the main parts of the imaging device 10 when viewed from the rear side (photographer side).

Note that in FIG. 2, illustration of the exterior portion 10c and the like is omitted.

Further, in the figures after FIG. 2, the parts necessary for understanding the present invention are illustrated, and unnecessary parts are omitted.

The imaging device 10 includes a control board 100, an image blur correction unit 200, a shutter unit 300, a base member 400, and a heat sink 700. The image blur correction unit 200 constitutes an image blur correction device that performs image blur correction on an image.

The control section of the image blur correction device includes a control board 100.

Both the image blur correction unit 200 and the shutter unit 300 include movable optical members. The image blur correction unit 200 is fixed to the base member 400 together with the shutter unit 300.

The image blur correction unit 200 is held on a base member 400 to which a shutter unit 300 is assembled and fixed.

For example, the image stabilization unit 200 is arranged along the optical axis P (see FIG. 1(A)) with respect to the base member 400 using three screws 600a, 600b, and 600c and three coil springs 500a, 500b, and 500c. It is supported so that it can be displaced in the direction. The operator performs work to adjust the amount of tightening of the screws 600a, 600b, and 600c.

Thereby, the inclination of the imaging surface of the imaging element 230 (see FIG. 3) with respect to the base member 400 can be adjusted.

When the adjustment of the inclination of the imaging plane is completed, the screws 600a, 600b, and 600c are adhesively fixed to the fixing unit of the image blur correction unit 200 to prevent them from loosening.

This fixing unit (200b) is a support member and will be described later using FIG. 3.

The control board 100 and the base member 400 are fixed to the exterior part 10c. A control IC 101 used for controlling imaging signals and connectors 102, 103, and 104 are mounted on the control board 100.

Furthermore, various electronic components (not shown) such as a chip resistor, a ceramic capacitor, an inductor, and a transistor are mounted on the control board 100.

A first connection member 270a extending from the image stabilization unit 200 is shown as a flexible wiring member.

The heat sink 700 is located between the control board 100 and the image blur correction unit 200, and connects the control board 100 and the image blur correction unit 200 via a plurality of parts (not shown).

The heat sink 700 is made of a material with high thermal conductivity, such as copper or aluminum.

The first connecting member 270a is connected to the connector 102. Thereby, the control board 100 and the image blur correction unit 200 are electrically connected.

A connector 104 arranged on the control board 100 is connected to a flexible board (not shown) extending from the shutter unit 300, and the control board 100 and the shutter unit 300 are electrically connected.

Next, the image blur correction unit 200 will be explained with reference to FIGS. 3 and 4.

3 and 4 are exploded perspective views of the image blur correction unit 200.

(An exploded perspective view of the image stabilization unit 200)
The image blur correction unit 200 includes a movable unit 200a and a fixed unit 200b.

The movable unit 200a is a movable member that includes an image sensor 230.

Fixing unit 200b is a support member fixed to base member 400.

The movable unit 200a is supported by the fixed unit 200b in a state that it can be displaced in any direction within a plane perpendicular to the optical axis P with respect to the fixed unit 200b.

By moving the movable unit 200a in a direction perpendicular to the optical axis P, an optical image blur correction operation is realized.

The main components of the fixing unit 200b are a front yoke 210, a base plate 250, and a rear yoke 260.

The main components of the movable unit 200a are the sensor holder 220 and the second connection member 240.

The first connection member 270a connects the movable unit 200a and the control board 100. The second connection member 240 connects the sensor holder 220 and the control board 100.

Both the first connection member 270a and the second connection member 240 are flexible printed circuit boards.

The movable unit 200a includes an image sensor board 231, and an image sensor 230 is mounted on the board.

The image sensor 230 is a CMOS (complementary metal oxide semiconductor) image sensor or a CCD (charge coupled device) image sensor, and converts an optical image of a subject into an electrical signal.

An image sensor 230 and an image sensor substrate 231 are adhesively fixed to the sensor holder 220 .

In the sensor holder 220, an optical low-pass filter 221 is arranged in front of the image sensor 230.

The optical low-pass filter 221 is an optical element that prevents the incidence of infrared rays and prevents the occurrence of color moiré and the like.

A first heat dissipating member 801 is adhesively fixed to the image sensor substrate 231 . A second heat radiating member 802 is bonded or connected to the tip of the first heat radiating member 801 .

Furthermore, the second heat dissipation member 802 is adhered or connected to the heat dissipation plate 700. The first heat dissipation member 801 may be bonded or connected to other parts of the movable unit 200a.

The sensor holder 220 has three openings 223a, 223b, and 223c formed therein. Moreover, three coils 241a, 241b, and 241c are mounted on the second connection member 240 (FIG. 3).

A second connecting member 240 is assembled and adhesively fixed to the sensor holder 220 from the rear side, and coils 241a, 241b, and 241c are housed inside the openings 223a, 223b, and 223c, respectively.

The sensor holder 220 is formed with three ball receiving portions 222a, 222b, and 222c (FIG. 3).

Further, the front yoke 210 is formed with ball receiving portions 213a, 213b, and 213c (FIG. 4) at positions facing the ball receiving portions 222a, 222b, and 222c, respectively.

The sensor holder 220, in which the image sensor 230 and the image sensor substrate 231 are adhesively fixed, and the front yoke 210 sandwich the spheres 215a, 215b, and 215c between opposing ball receiving portions.

Thereby, the spheres 215a, 215b, and 215c are supported in a rollable manner.

The front yoke 210 (FIG. 4) has magnets 212a, 212b, and 212c adhesively fixed at predetermined positions on the surface facing the sensor holder 220.

A plate of a ferromagnetic material (iron, etc.), not shown, is bonded to the sensor holder 220 at a position facing the magnets 212a, 212b, and 212c.

When the front yoke 210 and the sensor holder 220 are brought close to each other by a predetermined distance, the sensor holder 220 is magnetically attracted to the front yoke 210.

The sensor holder 220 is held by the front yoke 210 via spheres 215a, 215b, and 215c so as to be movable in any direction within a plane perpendicular to the optical axis P.

In the front yoke 210 shown in FIG. 4, magnets 212a, 212b, and 212c are attached to positions facing the coils 241a, 241b, and 241c, respectively.

Further, on the front side yoke 210, support columns 211a, 211b, and 211c are erected toward the base plate 250.

One end of each of the columns 211a, 211b, and 211c is press-fitted into the base plate 250. The front yoke 210 and the base plate 250 are joined to sandwich the sensor holder 220 therebetween.

Openings 251a, 251b, and 251c are formed in the base plate 250 at different positions when viewed from the direction of the optical axis P.

Magnets 261a, 261b, and 261c are incorporated into the openings 251a, 251b, and 251c, respectively.

When viewed from the direction of the optical axis P, the magnets 261a, 261b, and 261c are formed in substantially the same position and the same shape as the corresponding coils 241a, 241b, and 241c.

Further, the magnets 261a, 261b, and 261c are arranged at positions where the centers of the corresponding coils 241a, 241b, and 241c substantially coincide with each other.

The operator attaches the rear yoke 260 to the base plate 250 from the rear side so that the magnets 261a, 261b, and 261c are housed inside the openings 251a, 251b, and 251c, respectively.

Both rear yoke 260 and base plate 250 are made of ferromagnetic material.

The operator can cause the magnets 261a, 261b, and 261c to be magnetically attracted to each other simply by aligning the rear yoke 260 to which the magnets 261a, 261b, and 261c are bonded together and bringing them into contact with the base plate 250.

In other words, two parts can be joined without using adhesive.

Furthermore, an opening 252 is formed in the base plate 250.

When the sensor holder 220 is held between the front yoke 210 and the base plate 250, the image sensor substrate 231 is exposed to the rear side through the opening 252.

As shown in FIG. 4, connectors 232a and 232b are mounted on the image sensor board 231.

On the other hand, as shown in FIG. 3, a connector 271a is mounted on the first connection member 270a.

The operator inserts the first connecting member 270a into the image sensor board 231 from the rear side through the opening 252, and fits the connector 232a and the connector 271a.

The connector 232a and the connector 271a have a relationship of a plug connector and a receptacle connector whose fitting shapes are compatible with each other.

Furthermore, the connector 271a has a structure having two rows of signal terminals parallel to each other.

The first connecting members 270a have an elongated plate shape, and a connector 271a is mounted at one end of each.

The wiring direction of the first connecting member 270a is the longitudinal direction, and a connector 273 is mounted at each other end in the longitudinal direction.

The connector 273 has a plug connector/receptacle connector relationship whose fitting shape is compatible with the connector 102 (see FIG. 2) mounted on the control board 100.

Further, like the connector 271a, the connector 273 has a structure having two rows of signal terminals parallel to each other.

By connecting the connector 271a (see FIG. 3) and the connector 232a (see FIG. 4), the first connection members 270a are electrically connected to the image sensor substrate 231, respectively.

Moreover, thereby, the connector 271a is fixed to the movable unit 200a.

The first heat dissipating member 801 bonded to the image sensor substrate 231 has an elongated plate shape, and the first heat dissipating member 801 has a partially bent portion in order to keep the distance from the heat dissipating plate 700 as short as possible. It has a certain shape.

The first heat dissipation member 801 is made of a member that transfers heat using movement of a working fluid, such as a heat pipe or a vapor chamber, or a highly rigid material such as a copper plate or an aluminum plate.

A second heat radiating member 802 is bonded or connected to the tip of the first heat radiating member 801 . The second heat radiating member 802 is made of a flexible graphite sheet or the like.

Next, the second connection member 240 will be explained with reference to FIG. 5.

(Front view of second connection member 240)
FIG. 5 is a front view of the second connection member 240.

Coils 241a, 241b, and 241c are adhesively fixed to the second connection member 240.

The second connection member 240 is formed with soldering lands 243a, 243b, 243c, 243d, 243e, and 243f for electrical connection to the windings of each coil.

Soldering work is performed on each end of the coil 241a at the beginning and end of the winding to the soldering lands 243a and 243b.

Similarly, the soldering lands 243c and 243d are soldered at each end of the coil 241b at the beginning and end of the winding.

Soldering work is performed on each end of the coil 241c at the beginning and end of the winding to the soldering lands 243e and 243f.

Each coil is electrically connected to the second connecting member 240 by soldering.

In the second connection member 240, Hall elements 242a, 242b, and 242c are mounted inside the windings of coils 241a, 241b, and 241c, respectively.

Each Hall element is arranged at a substantially intermediate position between a plurality of pairs of soldering lands inside the corresponding coil winding.

The second connecting member 240 has a connector terminal portion 244 formed at one longitudinal end thereof.

A plurality of wiring patterns from each soldering land and each Hall element are expanded inside the second connection member 240 and connected to the connector terminal portion 244.

The connector terminal portion 244 is connected to a connector mounted on the control board 100.

In this way, a magnetic path is formed by the magnets 212a, 212b, 212c installed on the front yoke 210 and the magnets 261a, 261b, 261c installed on the rear yoke 260, and the coils 241a, 241b are placed in the magnetic field environment. , 241c are arranged.

The control unit controls the currents of these coils to generate Lorentz force in each coil.

The sensor holder 220 can be displaced in any direction within a plane perpendicular to the optical axis P using the Lorentz force as a thrust.

In addition, the Hall elements 242a, 242b, and 242c are mounted inside the coils 241a, 241b, and 241c, respectively, to prevent changes in magnetic force caused by the relative movement of the sensor holder 220 with respect to the magnets 212a, 212b, and 212c. To detect.

Based on the detection signal of each Hall element, the amount of relative displacement of the movable unit 200a with respect to the fixed unit 200b, that is, the amount of displacement in any direction in a plane orthogonal to the optical axis P can be detected.

When the image blur correction unit 200 is assembled, the positional relationships of the coils 241a, 241b, and 241c with respect to the image sensor 230 are different.

According to the direction definition described above in FIG. 1, the coil 241c is located at the lower right of the image sensor 230, and the coil 241a is located at the upper right. Further, in the control board 100 (see FIG. 2), the connectors 102 and 104 are mounted at the lower position, and the connector 103 is mounted at the upper position.

Connectors 102, 103, and 104 are mounted on the rear surface of the control board 100. A connector 232a is mounted on the rear surface of the image sensor board 231 (see FIG. 4).

The directions of image blur in the imaging device 10 are the pitch direction, the yaw direction, and the roll direction.

The pitch direction and the yaw direction are two directions around axes that are perpendicular to the optical axis P of the imaging optical system and orthogonal to each other, and the roll direction is a direction around an axis parallel to the optical axis P.

When correcting image blur in the pitch direction, which is rotation about the horizontal axis as the central axis, the movable unit 200a translates in the vertical direction.

When correcting image blur in the yaw direction, which is rotation about the vertical axis as the central axis, the movable unit 200a translates in the left-right direction.

When correcting image blur in the roll direction, which is rotation about the longitudinal axis as the central axis, the movable unit 200a rotates about an axis parallel to the longitudinal axis.

Although the moving end of the movable unit 200a is a mechanical end, the moving end may be a virtual end (electrical end) for drive control.

(Configuration of first heat radiating member 801 and second heat radiating member 802)
Next, the configurations of the first heat radiating member 801 and the second heat radiating member 802 will be described with reference to FIGS. 6 and 7. FIG. 6 is a perspective view of the image blur correction unit 200.

FIG. 13 shows a simple block diagram.

FIG. 7 is a cross-sectional view of the first heat radiating member 801, the second heat radiating member 802, the elastic member 803, the image sensor substrate 231, and the heat radiating plate 700.

As shown in FIG. 7, the second heat radiating member 802 is located between the first heat radiating member 801 and the heat radiating plate 700, and is configured to be bonded or connected to each other.

The second heat radiating member 802 is made of a flexible graphite sheet or the like as described above.

The second heat radiating member 802 has an elongated plate shape, and has at least one sheet whose both ends are adhered to the heat radiating plate 700.

The second heat radiating member 802 is adhesively fixed with double-sided tape (not shown) or the like.

Furthermore, the arc-shaped second heat radiating member 802 is also bonded to the first heat radiating member 801, and is bonded and fixed in a shape having at least one thickness direction in the optical axis direction as shown in FIG.

The second heat radiating member 802 is deformable according to the amount of movement of the movable unit 200a of the image blur correction unit 200.

The second heat radiating member 802 is not limited to one sheet, but may be composed of a plurality of sheets.

In this embodiment, both ends of one sheet, which is the second heat radiating member 802, are adhered to the heat radiating plate 700.

However, the first heat radiating member 801, the second heat radiating member 802, the elastic member 803, the image sensor substrate 231, and the heat radiating plate 700 are shown in a cross-sectional view in FIG.

A configuration may also be adopted in which the first heat radiating member 801 is bonded, and the arc-shaped second heat radiating member 802 is bonded to the heat radiating plate 700.

An elastic member 803 whose thickness direction is in the optical axis direction is arranged inside the second heat radiating member 802, and the second heat radiating member 802 is arranged so as to surround the elastic member 803.

The elastic member 803 is made of an easily deformable material such as urethane or rubber.

The second heat radiating member 802 and the elastic member 803 are adhesively fixed at at least one place on a plane perpendicular to the optical axis direction. In this embodiment, it is adhesively fixed on an adhesive surface 803a.

As shown in FIG. 2, in the imaging device of this embodiment, the image blur correction unit 200, the heat sink 700, and the control board 100 are assembled to the base member 400 from the rear in this order.

During assembly, the second heat radiating member 802 is flexible, so it is difficult to adhesively fix it to the heat radiating plate 700.

Therefore, an elastic member 803 is arranged inside the second heat radiating member 802, and the elastic member 803 is deformed in the optical axis direction by the pushing force during assembly, and the second heat radiating member 802 and the heat radiating plate 700 are adhesively fixed. is facilitated.

Further, in order to obtain a clear image, the image blur correction unit 200 needs to maintain mounting accuracy on the order of several μm, and its position needs to be adjusted in the optical axis direction.

Due to this position adjustment, the distance between the first heat radiating member 801 and the heat radiating plate 700 may change significantly, and a large load may be applied in the optical axis direction.

If a large load is applied in the optical axis direction, various negative effects may occur, such as deformation of the image blur correction unit 200a and deterioration of image quality due to deterioration of mounting accuracy.

Therefore, even if the dimension in the optical axis direction changes due to the elastic member 803, the load is absorbed by the elastic member 803 so that a large load is not applied in the optical axis direction due to the deformation of the elastic member 803.

The movable unit 200a moves up and down, left and right, and in the rotational direction, and moves on a plane perpendicular to the optical axis direction of the second heat radiating member 802 and the elastic member 803, which are located between the first heat radiating member 801 and the heat radiating plate 700, which are rigid bodies. The deforming force in the direction becomes a reaction force when the moving unit 200a moves.

This reaction force becomes a load when the movable unit 200a is driven, and if the second heat radiating member 802 has low flexibility, there is a possibility that the drive of the movable unit 200a will be inhibited.

Therefore, the second heat radiating member 802 is made of a highly flexible member.

If the deformation force of the second heat radiating member 802 and the elastic member 803 is large, the controllability of image blur correction will deteriorate, and it is expected that this will have a negative effect on image quality.

(Relationship between second heat dissipation member 802 and elastic member 803)
The relationship between the second heat radiating member 802 and the elastic member 803 shown in FIG. 7 will be explained.

The elastic member 803 generates a reaction force in a plane direction perpendicular to the optical axis direction due to the movement of the movable unit 200a.

Therefore, in this embodiment, in order to reduce the reaction force of the elastic member 803, the surface 803b of the elastic member 803 and the second heat dissipating member 802, which faces the adhesive surface 803a, is not bonded.

It is possible to reduce the deformation force of the elastic member 803 by using only one adhesive surface 803a and not fixing the surface 803b facing the adhesive surface 803a.

Furthermore, in this configuration, friction occurs between the elastic member 803 and the second heat radiating member 802 due to movement of the movable unit 200a.

Therefore, in order to reduce friction, a lubricant may be applied between the elastic member 803 and the second heat dissipating member 802, which are the opposing surfaces 803b.

The elastic member 803 may be a heat-radiating rubber compounded with a filler or the like in order to further improve the heat-radiating effect.

When the elastic member 803 is made of heat dissipating rubber, it can be easily bonded to the second heat dissipating member 802 by making the adhesive surface 803a and the opposing surface 803b a non-adhesive surface.

Therefore, the friction between the elastic member 803 and the second heat radiating member 802 can also be reduced.

In addition, the heat radiation efficiency can be further improved by using heat radiation grease for the above-mentioned lubricant.

When the elastic member 803 is made of urethane or the like, it is more flexible than heat dissipating rubber, so that the deformation force can be further reduced.

Since urethane does not have high thermal conductivity, the elastic member 803 does not transfer heat, and heat transfer mainly occurs in the second heat radiating member 802.

When the elastic member 803 is made of urethane, a clearance may be provided to reduce friction between the elastic member 803 and the second heat radiating member 802.

In addition to the deformation force of the elastic member 803, a reaction force is also generated by the deformation of the second heat dissipation member 802.

When the clearance A shown in the figure of the second heat radiation sheet 802 is less than or equal to the amount of movement of the movable unit, the second heat radiation member 802 and the elastic member 803 come into contact with each other at the surface 803c of the elastic member 803.

Therefore, a frictional force is generated, and the reaction force in the moving direction of the movable unit 200a increases.

Therefore, the clearance A in the movable direction between the elastic member 803 and the second heat dissipation sheet 802 is set to be greater than or equal to the maximum movable amount of the movable unit 200a, and the frictional force due to contact between the elastic member 803 and the second heat dissipation sheet 802 is set to zero. reducing force.

The maximum movable amount of the movable unit 200a firstly means the maximum mechanical end of the movable unit 200a that can move in the region of the mechanical end where members collide with each other.

Second, the maximum movable amount of the movable unit 200a means the maximum electrical end of the movable unit 200a that can move in the area inside the mechanical end where members collide with each other.

The maximum amount of movement in this embodiment means either one.

With the above configuration, heat from the image sensor 230 of the image blur correction unit 200 can be efficiently transferred by the first heat radiating member 801 via the image sensor substrate 231.

Furthermore, it is possible to connect the first heat radiating member 801 and the heat radiating plate 700 by a short distance while reducing the load on the second heat radiating sheet 802.

Therefore, it is possible to efficiently radiate heat from the first heat radiating member 801 to the heat radiating plate 700, and as a result, it is possible to efficiently cool the image sensor 230.

The second heat dissipation sheet 802 may be composed of not one sheet but a plurality of sheets. FIG. 8 shows a general layer structure of the second heat radiating member 802.

As shown in FIG. 8, graphite 901 is sandwiched between a PET sheet 902 and double-sided tape 903.

In order to reduce the deformation force of the second heat radiating member 802, holes 904 are made only in the PET sheet 902 and double-sided tape 903, leaving the graphite 901 as the heat radiating layer as is, to improve the flexibility of the second heat radiating member 802. Good too.

The shape of the hole 904 is not limited to a round hole, and various shapes can be considered. Alternatively, holes may be formed in all layers of the second heat dissipating member 802 to improve flexibility.

(Second heat dissipation member 802 configured with two routes)
The second heat radiating member 802 may be formed not in one route but in a plurality of routes.

FIG. 9 shows a second heat radiating member 802 and a third heat radiating member 804 that are configured with two routes.

In this embodiment, the first connecting member 270a of the image blur correction unit 200 is present.

The load caused by the deformation of the first connecting member 270a and the control of the movable unit 200a will be explained.

Here, it is assumed that the movable unit 200a moves to the left.

In this case, a rightward reaction force Fxa and a downward reaction force Fya are generated. In other words, a rightward reaction force Fxa is generated as a reaction force generated by each of the first connection members 270a.

Further, in the vertical direction, a downward reaction force Fya is generated as a reaction force of the first connecting member 270a.

Since a deforming force is generated in a direction that causes twisting in the first connecting member 270a, the reaction force Fxa in the right direction increases.

The downward reaction force Fya of the first connecting member 270a is in the bending direction of the first connecting member 270a, and is therefore smaller than the rightward reaction force Fxa.

The downward reaction force Fya of the first connection member 270a is smaller than the rightward reaction force Fxa.

In order to equalize the reaction force in the vertical direction and the horizontal direction, the load of the reaction force of the second heat dissipating member 802 and the elastic member 803 is made larger in the vertical direction than in the horizontal direction, and the load balance of the image blur correction unit 200 is adjusted. It is necessary to take

The second heat radiating member 802 and the third heat radiating member 804 configured with two routes can increase the heat radiating effect and make the load balance in the vertical direction more uniform than in the horizontal direction.

(Second heat dissipation member 802 to balance the load in the left and right direction)
As shown in FIG. 10, it is possible to set the widths of the second heat radiating member 802 and the third heat radiating member 804 so as to balance the load in the left and right direction, taking into consideration the magnitude of the reaction force Fxa in the right direction. It is.

FIG. 10 is a perspective view of the image blur correction unit 200. Therefore, the load on the first connecting member 270a is a large reaction force Fxa in the right direction, and the width of the second heat radiating member 802 is increased and the width of the third heat radiating member 804 is decreased to cancel the reaction force. , the reaction force in the left and right direction becomes smaller.

Further, the reaction force in the vertical direction increases, and the loads in the vertical direction and the horizontal direction become uniform, so that drive control becomes easier.

Furthermore, the same effect can be achieved by making the horizontal dimension of the elastic member 803 smaller than the vertical dimension.

Therefore, the load in the vertical direction and the load in the horizontal direction become close to each other, resulting in drive control that is nearly the same in the vertical and horizontal directions, which simplifies the control.

Increasing the load and complicating the control cause the magnets and coils required for high-precision control to become larger, and as a result, the imaging device 10 becomes larger.

Therefore, simplifying control while suppressing an increase in load contributes to downsizing and reducing power consumption of the imaging device 10.

In this embodiment, a configuration is adopted in which the load on the first connecting member 270a in the left-right direction is high.

However, even if the configuration of the image blur correction unit 200 causes a high load in the vertical direction, the same effect can be applied by changing the width of the second heat radiating member 802 and the width of the third heat radiating member 804. can.

(Combination of elastic member 803 and second heat dissipation member 802)
As shown in FIG. 11, there may be a plurality of combinations of the elastic member 803 and the second heat radiating member 802.

FIG. 11 is a perspective view of the image blur correction unit 200. By providing a plurality of elastic members 803, the volume of the elastic member 803 can be reduced.

By adjusting the horizontal and vertical dimensions of the second elastic member 803 while reducing the deformation force of the elastic member 803, it is possible to further adjust the balance between the horizontal load and the vertical load. .

In this embodiment, a design is performed in which the magnitudes of the reaction forces generated by the first connecting member 270a, the second heat radiating member 802, and the third heat radiating member 804 are made close to each other.

Both reaction forces are designed from the viewpoint of bending rigidity, taking into account width and thickness.

The width and number of the second heat radiating member 802 and the third heat radiating member 804 can be individually designed.

Further, the movable member is supported by the support member in a manner that it can be displaced relative to the support member in a direction orthogonal to a predetermined axis (optical axis P).

For example, an image blur correction unit that corrects image blur by moving a movable member is configured.

The image stabilization unit includes an electromagnetic drive means (coil and permanent magnet) that drives the movable member.

Regarding control of the image blur correction unit, the control section performs control to displace an image sensor or an optical member such as a lens or a prism with respect to a support member together with a movable member.

In each of the embodiments described above, an imaging device has been described as an example of an electronic device.

The disclosure of this embodiment includes the following configuration and method.

(Configuration 1)
An image sensor 230, a movable unit 200a that holds the image sensor 230 and is movable in a direction different from the optical axis of the imaging optical system in order to correct image blur, and an imaging device having a heat dissipation plate 700 that dissipates heat, a first heat dissipation sheet 801 connected to the movable unit 200a, and a second heat dissipation sheet 802 that connects the first heat dissipation sheet 801 and the heat dissipation plate 700. And,
When viewed from a direction perpendicular to the optical axis, the first heat dissipation sheet 801 has a bent portion in the space between the movable unit 200a and the second heat dissipation sheet 802,
The second heat dissipation sheet 802 is adhered to the first heat dissipation sheet 801 and the heat dissipation plate 700, and
When viewed from the direction perpendicular to the optical axis, the second heat dissipation sheet 802 has a bent portion in the space between the first heat dissipation sheet 801 and the heat dissipation plate 700 (FIG. 2). , Fig. 6, Fig. 7).

(Configuration 2)
An image sensor 230, a movable unit 200a that holds the image sensor 230 and is movable in a direction different from the optical axis of the imaging optical system in order to correct image blur, and A first heat dissipation sheet 801 connected to the heat dissipation plate 700, and a second heat dissipation sheet 802 connecting the first heat dissipation sheet 801 and the movable unit 200a. A device,
When viewed from a direction perpendicular to the optical axis, the first heat dissipation sheet 801 has a bent portion in the space between the heat dissipation plate 700 and the second heat dissipation sheet 802,
The second heat dissipation sheet 802 is different from the first heat dissipation sheet 801 and is adhered to the movable unit 200a, and
When viewed from the direction perpendicular to the optical axis, the second heat dissipation sheet 802 has a bent portion in the space between the first heat dissipation sheet 801 and the movable unit 200a (FIG. 12). , Fig. 6, Fig. 7).

(Configuration 3)
When viewed from the direction perpendicular to the optical axis, an elastic member 803 is provided between opposing sheet surfaces of the second heat dissipation sheet 802, and the elastic member 803 and the second heat dissipation sheet 802 are two opposing sheets. The imaging device according to configuration 1 or 2 (FIG. 7), wherein at least one of the surfaces is bonded.

(Configuration 4)
The imaging device according to configuration 3 (FIG. 7), wherein a lubricant is applied between the elastic member 803 and the second heat dissipation sheet 802.

(Configuration 5)
The imaging device according to configuration 3 (FIG. 7), wherein the elastic member 803 is a heat dissipating rubber.

(Configuration 6)
When viewed from the direction perpendicular to the optical axis, a clearance A is provided between the elastic member 803 and the second heat radiating member 802 in the direction perpendicular to the optical axis;
The imaging device according to configuration 3 (FIG. 7 ).

(Configuration 7)
The imaging according to configuration 3, wherein the second heat dissipation sheet 802 is composed of two sheets, and the two second heat dissipation members are perpendicular to each other in a plane perpendicular to the optical axis. Apparatus (Figure 9).

(Configuration 8)
The imaging device according to configuration 1 or 2 (FIG. 8), wherein the second heat dissipation sheet 802 is a graphite sheet, and mesh holes 904 are formed in the bent portion.

(Configuration 9)
A control board 100 on which a circuit for transmitting an image signal output from the image sensor 230 is mounted, and a first connection member 270a that electrically connects the movable unit 200a and the control board 100. ,
Among the two second heat dissipating members perpendicular to each other, the sheet width of the second heat dissipating sheet in the direction in which the load applied by the first connecting member 270a when correcting image blur of the movable unit 200a is large is small. The imaging device according to feature 7 (FIG. 10).

(Configuration 10)
When the two second heat dissipation sheets perpendicular to each other are defined as a heat dissipation unit, there are a plurality of sets of the heat dissipation units, and the plurality of sets of heat dissipation units have the same shape. Imaging device (Figure 11).

The present invention is not limited to this, and can be applied to various electronic devices in which a movable member movably supported by a support member and a control board are connected by a connection member.

It is possible to provide an electronic device that can be configured to have a high heat dissipation effect while suppressing an increase in load when the heat dissipation member is displaced.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications and changes can be made within the scope of the gist thereof. Some of the embodiments described above may be combined as appropriate.

10 Imaging device (electronic device)
100 Control board 200a Movable unit 230 Image sensor 270a First connection member 700 Heat sink 801 First heat sink 802 Second heat sink

Claims (10)

an imaging device; a movable unit that holds the imaging device and is movable in a direction different from the optical axis of the imaging optical system in order to correct image blur; and a heat radiator that radiates heat generated by the imaging device. An imaging device comprising a plate, a first heat dissipation sheet connected to the movable unit, and a second heat dissipation sheet connecting the first heat dissipation sheet and the heat dissipation plate,
When viewed from a direction perpendicular to the optical axis, the first heat dissipation sheet has a bent portion in the space between the movable unit and the second heat dissipation sheet,
The second heat dissipation sheet is adhered to the first heat dissipation sheet and the heat dissipation plate, and
The imaging device, wherein the second heat dissipation sheet has a bent portion in a space between the first heat dissipation sheet and the heat dissipation plate when viewed from a direction perpendicular to the optical axis. an imaging device; a movable unit that holds the imaging device and is movable in a direction different from the optical axis of the imaging optical system in order to correct image blur; and a heat radiator that radiates heat generated by the imaging device. An imaging device comprising a plate, a first heat dissipation sheet connected to the heat dissipation plate, and a second heat dissipation sheet connecting the first heat dissipation sheet and the movable unit,
When viewed from a direction perpendicular to the optical axis, the first heat dissipation sheet has a bent portion in a space between the heat dissipation plate and the second heat dissipation sheet,
The second heat dissipation sheet is different from the first heat dissipation sheet and is adhered to the movable unit, and
The imaging device characterized in that, when viewed from a direction perpendicular to the optical axis, the second heat radiation sheet has a bent portion in a space between the first heat radiation sheet and the movable unit. When viewed from the direction perpendicular to the optical axis, an elastic member is provided between opposing sheet surfaces of the second heat dissipation sheet, and at least one of the two opposing sheet surfaces of the elastic member and the second heat dissipation sheet is provided. The imaging device according to claim 1 or 2, wherein one surface is bonded. The imaging device according to claim 3, wherein a lubricant is applied between the elastic member and the second heat dissipation sheet. The imaging device according to claim 3, wherein the elastic member is heat-radiating rubber. When viewed from the direction perpendicular to the optical axis, a clearance is provided between the elastic member and the second heat dissipation sheet in the direction perpendicular to the optical axis;
4. The electronic device according to claim 3, wherein a clearance between the elastic member and the second heat dissipation sheet in the movable direction of the movable unit is greater than or equal to a maximum movable amount of the movable unit. The imaging device according to claim 3, wherein the second heat dissipation sheet is composed of two sheets, and the two second heat dissipation members are orthogonal to each other in a plane perpendicular to the optical axis. Device. 3. The imaging device according to claim 1, wherein the second heat dissipation sheet is a graphite sheet, and mesh holes are formed in the bent portion. A control board on which a circuit for transmitting an image signal output from the image sensor is mounted, and a first connection member that electrically connects the movable unit and the control board,
Of the two second heat radiating members orthogonal to each other, the sheet width of the second heat radiating member in the direction in which the load applied by the first connecting member when correcting image blur of the movable unit is larger is smaller. The imaging device according to claim 7. When the two second heat radiating members orthogonal to each other are defined as heat radiating units, there are a plurality of sets of the heat radiating units, and the plurality of sets of heat radiating units have the same shape, according to claim 7. imaging device.

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