JP2011254261A - Camera shake correction unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera shake correction unit capable of fully dissipating heat from an imaging device and electronic components for controlling the imaging device and obtaining favorable imaging signals.SOLUTION: The camera shake correction unit 3 for displacing an imaging device and performing a camera shake correction operation comprises: a fixed member 5; an imaging device 16; a Y movable frame 8 displaceably supported with respect to the fixed member 5 in a Y direction in a plane parallel to the light receiving surface of the imaging device 12; a Y driving part 7 for driving the Y movable frame 8; an X movable frame 10 capable of displacing in a Y direction with the Y movable frame 8, displaceably supported with respect to the Y movable frame 8 in an X direction crossing the first direction in a plane parallel to the light receiving surface of the imaging device 16, and supporting the imaging device 16; an X driving part 9 for driving the X movable frame 10; a heat sink 11 disposed at a position facing the X movable frame 10 fixed to the member 5 through a penetrating member 12 made of a shape memory alloy.

Description

  The present invention relates to a heat dissipation structure for a camera shake correction unit.

  In an imaging apparatus that uses an imaging device such as a digital camera, when the imaging operation is frequently repeated, the imaging device and the imaging control board may become high temperature, and noise components may increase in the imaging signal. For this reason, a heat dissipation structure is required. In particular, in an image pickup apparatus incorporating a camera shake correction mechanism in which the image pickup element and the image pickup control board are movable, a heat dissipation structure for the movable body is required.

  Therefore, the imaging apparatus disclosed in Patent Document 1 relates to an apparatus in which a camera shake correction mechanism including a movable imaging unit to which an imaging element is applied is incorporated. As shown in FIG. 23, the image pickup unit 18A of the image pickup apparatus is supported so as to be displaceable via a two-dimensional drive device with respect to a fixing member 22A fixedly supported by the apparatus exterior body. An element 42A, a heat radiating plate 44A, a signal processing circuit board 46A, and a heat radiating sheet 52A are provided.

  The heat sink 44A is disposed in close contact with the back side of the image sensor 42A. A spacer 48A is disposed between the heat radiating plate 44A and the signal processing circuit board 46A in order to provide a predetermined space SA. The heat radiation sheet 52A is disposed in close contact with each control element of the signal processing circuit board 46A. The heat of the image sensor 42A mainly passes through the heat radiating plate 44A, and further, the heat of the control element of the signal processing circuit board 46A mainly radiates outside the apparatus through the heat radiating sheet 52A via the air.

JP 2009-147485 A

  In the imaging apparatus disclosed in Patent Document 1 described above, the heat of each of the imaging elements 42A and the control elements of the signal processing circuit board 46A is mainly radiated through air of a certain gap, and therefore sufficient heat dissipation is not necessarily performed. There was a problem that I could not expect.

  The present invention has been made in order to solve the above-described problems. A camera shake correction unit capable of sufficiently dissipating heat from the image sensor and the image sensor control electronic component and obtaining a good image signal without noise is provided. The purpose is to provide.

  In order to solve the above-described problems, a camera shake correction unit according to the present invention is a camera shake correction unit that performs a camera shake correction operation by displacing an image sensor for receiving a subject image formed by a photographing optical system and generating image data. , At least one of a fixing member, the image sensor and / or a printed circuit board to which an electronic component disposed in parallel to the light receiving surface of the image sensor is fixed, and a plane parallel to the light receiving surface of the image sensor A first movable member supported so as to be displaceable with respect to the fixed member along a first direction, first driving means for driving the first movable member, and the first movable member A second member that is displaceable along the first direction together with the member and intersects the first direction in a light receiving surface of the image sensor and / or a plane parallel to the plane of the printed circuit board. A second movable member that is supported so as to be displaceable with respect to the first movable member along a direction and supports the imaging element; and a second driving unit for driving the second movable member; A heat dissipating member disposed at a position facing the second movable member; and a penetrating member made of a shape memory alloy for connecting and fixing the fixing member and the heat dissipating member.

  According to the present invention, it is possible to provide a camera shake correction unit that can sufficiently dissipate heat from an image sensor or an image sensor control electronic component and obtain a good image signal without noise.

1 is a longitudinal sectional view of an essential part of a digital camera including a camera shake correction unit as a first embodiment of the present invention. AA sectional view of FIG. Sectional drawing of the coupling | bond part of the penetration member which couple | bonds a heat sink and a fixing member in the camera-shake correction unit built in the digital camera of FIG. 1 is a schematic cross-sectional view of a camera shake correction unit built in the digital camera of FIG. FIG. 1 is a schematic cross-sectional view of a camera shake correction unit built in the digital camera of FIG. FIG. 1 is a schematic cross-sectional view of a camera shake correction unit built in the digital camera of FIG. The figure which shows the change of the elongation rate with respect to the temperature of the shape memory alloy which is a raw material of the penetration member applied to the camera-shake correction unit of FIG. Heat transfer path diagram in the image stabilization unit of FIG. The figure which shows the change of the temperature difference of an image pick-up element and external air with respect to external temperature in the camera-shake correction unit of FIG. 4, and the conventional camera-shake correction unit. The figure which shows the change of the temperature difference of an image pick-up element and external air with respect to the image pick-up element calorific value in the camera-shake correction unit of FIG. 4, and the conventional camera-shake correction unit. The figure which shows the temperature difference of each structural member and the external air when the penetrating member in the camera shake correction unit of FIG. 4 is a shape memory alloy and when it is another kind of metal Schematic sectional view in a non-operating state of an image sensor of a camera shake correction unit as a second embodiment of the present invention FIG. 12 is a schematic cross-sectional view of the image stabilization unit in FIG. Heat transfer path diagram in the image stabilization unit of FIG. The figure which shows the change of the temperature difference of an image pick-up element and external air with respect to external temperature in the camera-shake correction unit of FIG. 12, and the conventional camera-shake correction unit. The figure which shows the change of the temperature difference of a control board unit and external air with respect to external temperature in the camera-shake correction unit of FIG. 12, and the conventional camera-shake correction unit. The figure which shows the change of the temperature difference of an image pick-up element and external air with respect to the image pick-up element calorific value in the camera-shake correction unit of FIG. 12, and the conventional camera-shake correction unit. The figure which shows the change of the temperature difference of a control board unit with respect to external air with respect to the control board unit calorific value in the camera-shake correction unit of FIG. 12, and the conventional camera-shake correction unit. 12 is a diagram showing a temperature difference between each structural member and outside air when the penetrating member in the image stabilization unit of FIG. 12 is a shape memory alloy and when it is made of another metal. Typical sectional drawing in the image sensor operation state of the camera shake correction unit as a third embodiment of the present invention 20 is a schematic cross-sectional view of the image stabilization unit of FIG. 20 in a high-temperature state of the image sensor. Heat transfer path diagram in the image stabilization unit of FIG. Longitudinal section of the main part of a conventional image stabilization unit

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A digital camera 1 that is an imaging apparatus incorporating a camera shake correction unit according to an embodiment of the present invention will be described with reference to FIGS.

  The digital camera 1 includes a camera exterior body 2 including a camera shake correction unit 3 and an imaging control unit (not shown), and a lens barrel unit 30 including a photographing lens 31 that is a photographing optical system.

  In the figure, the optical axis of the photographic lens 31 is indicated by O, the subject side in the optical axis O direction is the front, and the imaging side of the optical axis O is the rear (back side). Further, in the normal direction with respect to the optical axis O, the horizontal direction is the X direction and the vertical direction is the Y direction in a normal camera photographing posture.

  The imaging control unit is an electric control unit that takes in image data (imaging signal) output from the imaging element 16, performs image processing, and records it in a storage medium (not shown). A camera shake sensor for detecting the camera shake of the body 2 is provided.

  The camera shake correction unit 3 is a fixed member 5 fixedly supported by the camera exterior body 2 and a first movable member supported by the fixed member 5 and displaced in the Y direction which is the first direction with respect to the fixed member 5. The Y movable frame 8 is disposed on the fixed member, and is supported by the Y movable frame 8 as a first driving means for driving the Y movable frame 8 in the Y direction. The X movable frame 10 as the second movable member that is displaced in the X direction, which is the second direction, and the second movable member 10 supported by the Y movable frame 8 and driving the X movable frame 10 in the X direction. An X drive unit 9 as a driving means, an optical filter 17, an image sensor support plate 15 and an image sensor 16 as members fixedly supported by the X movable frame 10, and a fixed member 5 supported by a penetrating member 12 for imaging. A heat radiating portion arranged in a state of facing the element support plate 15 in the direction of the optical axis O. And a heat radiating plate 11 as a.

  The fixing member 5 is formed of an aluminum alloy having good thermal diffusibility, stainless steel or copper alloy, or a high thermal conductive resin, and is fixed to the camera exterior body 2 via a support portion 6.

  The Y drive unit 7 and the X drive unit 9 are actuators such as a stepping motor and a voice coil motor, and drive the Y movable frame 8 or the X movable frame 10 to be displaced along the Y direction or the X direction, respectively.

  The Y movable frame 8 and the X movable frame 10 are each formed of an aluminum alloy or a high thermal conductive resin.

  The image sensor 16 is for receiving the subject image formed by the photographing lens 31 and generating image data. The image sensor 16 is fixed to the image sensor support plate 15 with the image sensor light receiving surface along the XY plane. The imaging control unit is connected via the flexible circuit board 19.

  The imaging element support plate 15 is a flat plate member formed of an aluminum alloy, and is fixed to the X movable frame 10 in a state where the plane portion of the support plate is parallel to the imaging element light receiving surface, that is, along the XY plane. Has been.

  The heat radiating plate 11 is a flat plate member made of a stainless steel plate, a copper plate, a high thermal conductive resin, or the like with good thermal diffusivity. The flat portion of the heat radiating plate is parallel to the image sensor support plate 15 and Arranged in a separated state in operation and operating state. A plurality of penetrating members 12 are adhered and fixed between the rear surface of the heat sink 11 and the front surface of the fixing member 5 in a state of passing through the Y-direction long hole 8a of the Y movable frame 8.

  The penetrating member 12 is a member made of a shape memory alloy, and utilizes a change in length that occurs during phase transformation from martensite to austenite depending on the temperature. It is desirable that the cross-sectional area on the XY plane is large and the thermal conductivity is high, that is, the thermal conductivity is 1 W / mK or more. In the present embodiment, one having a total cross-sectional area of 20 mm × 20 mm, a length of 4 mm, and a thermal conductivity of 16 W / mK is applied. However, the cross-sectional area of the penetrating member 12 is smaller than the plane area of the heat sink 11. In addition, the elongation rate with respect to the temperature of the raw material of the penetration member 12 is shown by FIG. As will be described later, the penetrating member 12 is fixed to the heat radiating plate 11 and the fixing member 5 by adhesion, screw fastening, or caulking.

  A coupling structure between the heat radiating plate 11 and the fixing member 5 of the penetrating member 12 will be described with reference to a cross-sectional view of a coupling portion in FIG. The end of the penetrating member 12 on the side of the heat radiating plate 11 is fitted into the concave portion 11a of the heat radiating plate 11 and is bonded and fixed. On the other hand, a nut member 12a is bonded and fixed to an end portion of the penetrating member 12 on the fixing member 5 side. The fixing member 5 is applied to the nut member 12 and the screw 18 is screwed to fix the end of the penetrating member 12 to the fixing member 5. At the time of assembly, the penetrating member 12 fixed to the heat radiating plate 11 is inserted into the Y-direction long hole 8a of the Y movable frame 8 in advance, and the fixing member 5 is applied to the nut member 12a of the penetrating member 12 from the back side. To the fixing member 5.

  An operation when the digital camera 1 having the above-described configuration performs photographing in the camera shake correction mode will be described. If the camera shake sensor detects the camera shake of the camera exterior body 2 when the release switch is pressed, the camera shake unit 3 corrects the camera shake state of the camera exterior body 2 by the camera shake unit 3 and the X drive section. 9 is driven, and the Y movable frame 8 or the X movable frame 10 is driven to be displaced in the Y direction or the X direction. The image sensor 16 is exposed during the displacement operation. An image pickup signal subjected to camera shake correction from the image pickup device 16 is output to the image pickup control unit, and photographed image data is recorded in the storage medium.

  Here, the heat radiation state when the above-described photographing operation is repeatedly performed and the temperature of the image sensor 16 rises will be described with reference to FIGS. 4 to 6 and 8. In the standby state, the temperature of the imaging element 16 or the penetrating member 12 that supports the heat sink 11 is close to room temperature, and the length of the penetrating member 12 in the optical axis O direction is based on the elongation characteristics shown in FIG. It is in a relatively short state. Therefore, as shown in FIG. 4, the imaging element support plate 15 and the heat radiating plate 11 are separated by a relatively large separation distance C0.

  Thereafter, when imaging is repeated and the temperature of the image sensor 16 rises, the temperature of the penetrating member 12 that supports the heat sink 11 also rises and extends in the direction of the optical axis O. The extension of the penetrating member 12 brings the imaging element support plate 15 and the heat radiating plate 11 closer together, resulting in a narrower separation distance C1 as shown in FIG. When the space between the image sensor support plate 15 and the heat radiating plate 11 approaches, the heat of the image sensor 16 is easily transferred from the image sensor support plate 15 to the heat radiating plate 11, and the heat of the heat radiating plate 11 is Heat is transferred to the fixing member 5 through the penetrating member 12 and is radiated toward the outside air. As a result, the temperature rise of the image sensor 16 is suppressed, and a good image signal without noise is output from the image sensor 16.

  In addition, when imaging is repeated for a long time and the outside air temperature is also high, the imaging element 16 is in an abnormally high temperature state, a state where a good imaging signal without noise cannot be output, or an imaging impossible state occurs, the penetrating member 12 Further extends in the direction of the optical axis O, and the heat radiating plate 11 contacts the image sensor support plate 15 as shown in FIG. In this contact state, the heat of the image sensor 16 is easily transferred from the image sensor support plate 15 to the heat radiating plate 11, and the temperature of the image sensor 16 rapidly decreases. And the image pick-up element 16 is returned to the state which can output the favorable image pick-up signal without noise promptly.

  A path through which heat from the image sensor 16 of the image stabilization unit 3 of the present embodiment is radiated to the outside air will be described with reference to a heat transfer path diagram of FIG. The heat of the image sensor 16 is transmitted from the image sensor support plate 15 to the X movable frame 10, the X drive unit 9, the Y movable frame 8, the Y drive unit 7, and the fixed member 5, while from the image sensor support plate 15 through the air. Or heat is transferred to the heat radiating plate 11, the penetrating member 12, and the fixing member 5 in a contact thermal resistance state, and further from the fixing member 5 to the camera exterior body 2 via the support portion 6 and further directly to the outside air. Alternatively, heat is dissipated through air.

  FIG. 9 shows results obtained by simulation using a personal computer (hereinafter referred to as “PC”) for changes in the temperature difference between the image sensor and the outside air with respect to the outside air temperature in the camera shake correcting unit 3 of the present embodiment and the conventional camera shake correcting unit. Will be described.

  In FIG. 9, a characteristic line Ea indicates a temperature difference between the imaging element and the outside air with respect to the outside air temperature in a structure without the heat sink 11 in the conventional camera shake correction unit. A characteristic line Eb indicates a temperature difference between the image sensor and the outside air with respect to the outside air temperature in a structure in which the heat radiating plate 11 is arranged with a certain distance from the image sensor support plate 15 in the camera shake correction unit. The characteristic line Ec indicates the relationship between the image sensor and the outside air with respect to the outside air temperature when the structure in which the separation distance between the heat sink 11 and the image sensor support plate 15 described above is changed according to the temperature in the camera shake correction unit 3 of the present embodiment. Indicates temperature difference. Each shows a case where the heat generation amount of the image sensor 16 is 0.5 W.

  In the camera shake correction unit 3 of the present embodiment, the temperature difference between the image sensor 16 and the outside air is small compared to the conventional unit, and when the outside air temperature is high, the temperature difference between the image sensor and the outside air is In the above-described conventional unit, the temperature of the image sensor increases with the outside air, but in the case of the camera shake correction unit 3 of the present embodiment, it decreases. That is, the degree to which the temperature of the image sensor 16 increases is low.

  Further, FIG. 10 illustrates a result obtained by a simulation using a PC regarding a change in the temperature difference between the image sensor and the outside air with respect to the image sensor heat generation amount in the camera shake correction unit 3 of the present embodiment and the conventional camera shake correction unit.

  In FIG. 10, a characteristic line Fa indicates a temperature difference between the image sensor 16 and the outside air with respect to the heat generated by the image sensor in the structure without the heat sink 11 in the conventional camera shake correction unit. The characteristic line Fb indicates the temperature difference between the image sensor 16 and the outside air with respect to the heat generated by the image sensor in the structure in which the heat sink 11 is arranged with a certain distance from the image sensor support plate 15 in the conventional image stabilization unit. Show. The characteristic line Fc represents the image sensor 16 with respect to the image sensor heat generation amount when the structure in which the separation distance between the heat sink 11 and the image sensor support plate 15 described above in the camera shake correction unit 3 of the present embodiment changes with temperature is adopted. Indicates the temperature difference from the outside air. In each case, the outside air temperature is 40 ° C.

  In the camera shake correction unit 3 of the present embodiment, as the image pickup element heat generation amount increases as in the case of the conventional unit, the temperature difference between the image pickup element 16 and the outside air increases, but within a predetermined image pickup element heat generation amount range. In particular, the temperature difference between the image sensor 16 and the outside air at a location where the heat generation amount is high is smaller in the camera shake correction unit 3 of the present embodiment than in the conventional unit. That is, the temperature of the image sensor 16 can be suppressed lower.

  Next, regarding the temperature difference between each component member and the outside air in the camera shake correction unit 3 of the present embodiment that applies the penetrating member made of shape memory alloy and the camera shake correction unit that applies the penetrating member not made of shape memory alloy, PC is used. Results obtained by the simulation used will be described with reference to FIG.

  In FIG. 11, a characteristic line Gd indicates a temperature difference between each component member and the outside air in the structure of the camera shake correction unit to which a metal penetrating member that is not a shape memory alloy is applied. A characteristic line Gc indicates a temperature difference between each component member and outside air in the camera shake correction unit 3 of the present embodiment to which a shape memory alloy-made penetrating member is applied. In each case, the outside air temperature is 40 ° C. and the heat generation amount of the image sensor 16 is 0.5 W.

  The temperature difference mc between the imaging element 16 and the fixing member 5 on the characteristic line Gc of the camera shake correction unit 3 of the present embodiment is the temperature difference between the imaging element 16 and the fixing member 5 on the characteristic line Gd indicated by the temperature difference with the outside air. The temperature of the image sensor 16 in the camera shake correction unit 3 of the present embodiment is suppressed to be lower than md.

  As described above, according to the digital camera 1 incorporating the camera shake unit 3 of the present embodiment, the structure in which the heat radiating plate 11 arranged to face the image sensor support plate 15 is supported by the penetrating member 12 made of shape memory alloy. By changing the gap between the image sensor support plate 15 and the heat radiating plate 11 according to the operating temperature of the image sensor 16, the heat transfer in the operating state of the image sensor 16 is improved and the image sensor 16 is unlikely to be in a high temperature state. To do. In the unlikely event that the image sensor 16 reaches an abnormally high temperature, the heat sink 11 can be brought into contact with the image sensor support plate 15 and the image sensor 16 can be rapidly cooled to return to a state in which imaging can be performed quickly.

  In addition, in the camera shake correction unit 3 of the first embodiment described above, the Y movable frame 8 provided with the Y-direction long hole 8a is applied to allow the penetrating member 12 to be inserted, and is fixed to the penetrating member 12 during assembly as described above. It is necessary to perform the coupling with the member 5 after the Y movable frame 8 is mounted, and the assemblability is not good.

  Therefore, in place of the Y movable frame 8, a modification in which a linearly movable Y movable member that moves in the Y direction instead of the frame shape is applied by applying a linear actuator as the Y drive unit is conceivable. An X drive unit 9 that drives the X drive frame 10 is supported by the Y movable frame 8.

  In this modification, the Y movable frame 8 provided with the Y-direction long hole 8a for penetrating member insertion in the first embodiment is unnecessary. Further, it is possible to adopt a structure in which the coupling between the penetrating member 12 and the fixing member 5 is directly bonded and fixed without necessarily using the nut member 12a, and the heat sink 11, the penetrating member 12 and the fixing member are fixed when the camera shake correction unit is assembled. Assembly is possible even when the member 5 is integrated, and the assemblability is improved.

  In addition, as another modification of the first embodiment, it is possible to propose a configuration in which a contact sensor is arranged on a flat surface portion of the heat radiating plate 11 that can come into contact with the imaging element support plate 15. In this modification, when the image sensor 16 is in an abnormally high temperature state and the contact sensor detects that the heat radiating plate 11 is in contact with the image sensor support plate 15 as shown in FIG. Control to prohibit.

  Therefore, according to this modification, when the image sensor 16 reaches an abnormally high temperature state, the heat radiating plate 11 further pressurizes the image sensor support plate 15 to prevent the camera shake correction unit 3 from malfunctioning and at the same time incomplete. Thus, it is possible to prevent the camera shake correction processing operation from being performed.

Next, a camera shake correction unit as a second embodiment of the present invention will be described with reference to FIGS.
The camera shake correction unit 3A of the present embodiment is built in a digital camera that is an imaging device, as in the first embodiment. As a different configuration from the camera shake correction unit 3 of the first embodiment, an electronic component 22 that controls the image sensor 16 in the state of being close to the back side of the image sensor support plate 15 as shown in FIGS. The control board unit 20 that is the printed board is supported, and the heat radiating plate 11 that is supported by the penetrating member 12 is disposed in a state of being opposed to the control board unit 20 and having a gap. The other components from the fixed member 5 to the Y movable portion 8, the X movable portion 10, the image sensor 16 and the like are the same as those in the camera shake correction unit 3 of the first embodiment, and are denoted by the same reference numerals. Hereinafter, different parts will be described.

  In the camera shake correction unit 3 </ b> A, the heat radiating plate 11 faces the electronic component 22 such as a control element mounted on the printed board 21 of the control board unit 20, is disposed with a gap in the optical axis O direction, and penetrates the fixing member 5. It is supported via the member 12.

  In the state where photographing is started or in the photographing standby state, the temperature of the image pickup device 16, the electronic component 22, or the penetrating member 12 is close to room temperature, and the surface of the electronic component 22 of the control board unit 20 as shown in FIG. And the radiator plate 11 are separated by a relatively large separation distance P0.

  When the temperature of the penetrating member 12 rises together with the imaging element 16 and the electronic component 22 in a state where the photographing is repeated, the length of the penetrating member 12 in the optical axis O direction increases. Due to the extension of the penetrating member 12, the surface of the electronic component 22 of the control board unit 20 and the heat radiating plate 11 approach each other, resulting in a narrower distance P1 as shown in FIG. When the electronic component 22 and the heat radiating plate 11 are close to each other as described above, the heat of the image pickup device 16 and the electronic component 22 is more easily transferred to the heat radiating plate 11 via the image pickup device support plate 15 or the control board unit 20. It becomes a state. The heat of the heat radiating plate 11 is transferred to the fixing member 5 through the penetrating member 12 and is radiated toward the outside air. As a result, both the temperature rises of the image sensor 16 and the electronic component 22 are suppressed, and a good image signal and captured image signal free from noise are output from the image sensor 16 and the control board unit 20.

  A path through which heat of the image sensor 16 and the control board unit 20 in the camera shake correction unit 3A is radiated to the outside air will be described with reference to a heat transfer path diagram of FIG. The heat of the image sensor 16 is transferred from the image sensor support plate 15 to the X movable frame 10, the X drive unit 9, the Y movable frame 8, the Y drive unit 7, and the fixed member 5. On the other hand, heat is transferred from the imaging element support plate 15 to the control board unit 20 and the heat radiating plate 11 via air, and further transferred to the penetrating member 12 and the fixing member 5, and further from the fixing member 5 via the support portion 6. Then, heat is radiated to the camera exterior body 2 and to the outside air directly or via air.

  The heat transfer from the control board unit 20 to the heat sink 11 is maintained at a relatively small distance P1 between the control board unit 20 and the heat sink 11 as described above in a normal photographing state. Further, it is possible to prevent the electronic component 22 of the image sensor 16 and the control board unit 20 from becoming high temperature.

  FIGS. 15 and 16 illustrate the results obtained by the simulation using the PC regarding the change in the temperature difference between the image sensor and the control board unit and the outside air with respect to the outside air temperature in the camera shake correcting unit 3A of the present embodiment and the conventional camera shake correcting unit. To do.

  In FIG. 15, a characteristic line Ha indicates a temperature difference between the image sensor 16 and the outside air with respect to the outside air temperature in a structure in which the conventional camera shake correction unit has no heat sink 11. A characteristic line Hb indicates a temperature difference between the imaging element 16 and the outside air with respect to the outside air temperature in a structure in which the heat sink 11 is arranged with a constant separation distance from the control board unit 20 in the camera shake correction unit. The characteristic line Hc indicates the relationship between the imaging element 16 and the outside air with respect to the outside air temperature when the structure in which the separation distance between the heat sink 11 and the control board unit 20 described above is changed according to the temperature in the camera shake correction unit 3A of the present embodiment. Indicates temperature difference. The case where the calorific values of the image sensor 16 and the control board unit 20 are 0.5 W is shown.

  In the camera shake correction unit 3A of the present embodiment, when the temperature difference between the image sensor 16 and the outside air is small and the outside air temperature is higher than that of the conventional unit, the temperature difference between the image sensor 16 and the outside air is The conventional unit is substantially constant, that is, the temperature of the image sensor 16 increases with the outside air, but decreases in the camera shake correction unit 3A of the present embodiment. That is, the degree to which the temperature of the image sensor 16 increases is low.

  In FIG. 16, a characteristic line Ia indicates a temperature difference between the control board unit and the outside air with respect to the outside air temperature in the structure without the heat sink 11 in the conventional camera shake correction unit. A characteristic line Ib indicates a temperature difference between the control board unit 20 and the outside air with respect to the outside air temperature in the structure in which the heat sink 11 is arranged with a constant separation distance from the control board unit 20 in the camera shake correction unit. The characteristic line Ic indicates that the control board unit 20 and the outside air with respect to the outside air temperature when the structure in which the separation distance between the heat sink 11 and the control board unit 20 described above is changed according to the temperature in the camera shake correction unit 3A of the present embodiment. The temperature difference is shown. The case where the calorific value of the image sensor 16 and the control board unit is 0.5 W is shown.

  In the camera shake correction unit 3A of the present embodiment, when the temperature difference between the control board unit 20 and the outside air is small compared to the conventional unit and the outside air temperature becomes high, the temperature between the control board unit 20 and the outside air is high. The difference is substantially constant in the conventional unit, that is, the temperature of the control board unit 20 increases with the outside air, but decreases in the camera shake correction unit 3A of the present embodiment. That is, the degree to which the temperature of the control board unit 20 becomes high is low.

  Further, a simulation using a PC for a change in temperature difference between the image sensor or the control board unit and the outside air with respect to the heat generation amount of the image sensor and the control board unit in the camera shake correction unit 3A of the present embodiment and the conventional camera shake correction unit. The results obtained from the above will be described with reference to FIGS.

  In FIG. 17, a characteristic line Ja indicates a temperature difference between the image sensor and the outside air with respect to the heat generated by the image sensor in the structure without the heat sink 11 in the conventional camera shake correction unit. A characteristic line Jb indicates a temperature difference between the imaging element and the outside air with respect to the amount of heat generated by the imaging element in a structure in which the heat radiating plate 11 is arranged with a certain distance from the control board unit 20 in the conventional camera shake correction unit. The characteristic line Jc indicates that the image pickup device 16 and the outside air with respect to the heat generation amount of the image pickup device when the structure in which the separation distance between the heat sink 11 and the control board unit described above is changed depending on the temperature in the camera shake correction unit 3A of the present embodiment. The temperature difference is shown. In each case, the outside air temperature is 40 ° C.

  In the camera shake correction unit 3A of the present embodiment, as the image pickup element heat generation amount increases as in the case of the conventional unit, the temperature difference between the image pickup element 16 and the outside air increases, but within a predetermined image pickup element heat generation amount range. In particular, the temperature difference between the image sensor 16 and the outside air where the heat generation amount is high is smaller in the camera shake correction unit 3A of the present embodiment than in the conventional unit. That is, the temperature of the image sensor 16 can be suppressed lower.

  In FIG. 18, a characteristic line Ka indicates a temperature difference between the control board unit 20 and the outside air with respect to the heat generation amount of the control board unit in a structure in which the conventional camera shake correction unit has no heat sink 11. A characteristic line Kb indicates a temperature difference between the control board unit 20 and the outside air with respect to the heat generation amount of the control board unit in a structure in which the heat sink 11 is arranged with a constant separation distance from the control board unit 20 in the camera shake correction unit. . The characteristic line Kc is the control board unit 20 with respect to the amount of heat generated by the control board unit when the above-described structure in which the distance between the heat sink 11 and the control board unit varies depending on the temperature in the camera shake correction unit 3A of the present embodiment. Indicates the temperature difference from the outside air. In each case, the outside air temperature is 40 ° C.

  In the camera shake correction unit 3A of the present embodiment, as the control board unit heat generation amount increases as in the case of the conventional unit, the temperature difference between the control board unit 20 and the outside air increases, but a predetermined control board unit heat generation amount. In this range, the temperature difference between the control board unit 20 and the outside air at a particularly high calorific value is smaller in the camera shake correction unit 3A of the present embodiment than in the conventional unit. That is, the temperature of the control board unit 20 can be kept lower.

  Next, regarding the temperature difference between each component member and the outside air in the camera shake correction unit 3A of the present embodiment that applies the penetrating member made of shape memory alloy and the camera shake correction unit that applies the penetrating member not made of shape memory alloy, PC is used. Results obtained by the simulation used will be described with reference to FIG.

  In FIG. 19, a characteristic line Ld indicates a temperature difference between each component member and the outside air in the structure of the camera shake correction unit to which the penetrating member that is not made of the shape memory alloy is applied. A characteristic line Lc indicates a temperature difference between each component member and the outside air in the camera shake correction unit 3A of the present embodiment to which a shape memory alloy-made penetrating member is applied. In this example, the outside air temperature is 40 ° C. and the image sensor 16 and the control board unit 20 respectively generate heat of 0.5 W.

  The temperature difference nc between the control board unit 20 and the fixing member 5 in the characteristic line Lc of the camera shake correction unit 3A of the present embodiment is lower than the temperature difference nd between the control board unit 20 and the fixing member 5 in the characteristic line Ld. The ambient temperature including the image sensor 16 and the control board unit 20 in the camera shake correction unit 3A of the present embodiment can be kept low.

  As described above, according to the digital camera 1 incorporating the camera shake unit 3A of the present embodiment, the structure in which the heat radiating plate 11 disposed facing the control board unit 20 is supported by the penetrating member 12 made of shape memory alloy. By adopting, the gap between the control board unit 20 and the heat radiating plate 11 is changed according to the operating temperature of the image pickup element 16 and the control board unit 20, thereby improving the heat transfer property of the image pickup element 16 and the control board unit 20 in a high temperature state. In addition, it is possible to prevent both the image sensor 16 and the control board unit 20 from becoming a high temperature.

A camera shake correction unit according to a third embodiment of the present invention will be described with reference to FIGS.
The camera shake correction unit 3B of the present embodiment is built in a digital camera that is an image pickup apparatus, and has a configuration different from that of the camera shake correction unit 3 of the first embodiment, as shown in FIGS. A structure in which a heat radiating sheet 26 is attached to the front surface of the heat radiating plate 25 on the back side of the image sensor support plate 15 with respect to the heat radiating plate 25 arranged opposite to the optical axis O direction. As in the case of the first embodiment, the shape memory alloy penetrating member 12 is fixed to the rear surface side of the heat radiating plate 25 in the same manner as in the first embodiment. The other components from the fixed member 5 to the Y movable portion 8, the X movable portion 10, the image sensor 16 and the like are the same as those in the camera shake correction unit 3 of the first embodiment, and are denoted by the same reference numerals. Hereinafter, different parts will be described.

  The heat radiating sheet 26 attached to the heat radiating plate 25 is made of an elastically deformable material having good thermal conductivity, and acts as a stress relieving member when contacting the image sensor support plate 15. For example, silicon rubber, acrylic elastomer Etc. are formed.

  In the camera shake correction unit 3B, in the state immediately after the start of photographing, in the photographing standby state, or in the photographing state, the gap Q between the imaging element support plate 15 and the heat radiating sheet 26 on the heat radiating plate 25 side is as shown in FIG. The gap Q decreases as the temperature of the penetrating member 12 increases, and the heat of the image sensor 16 is more easily transferred to the heat radiating plate 25 side, so that the image sensor 16 is radiated.

  Should the imaging device 16 become in an abnormally high temperature state, the penetrating member 12 extends in the direction of the optical axis O, the gap Q disappears as shown in FIG. 21, and the imaging device support plate 15 and the heat dissipation sheet 26 come into contact with each other. . The heat radiation sheet contact state is a state in which high heat can be transferred from the image sensor support plate 15 to the heat radiation sheet 26 and the heat radiation plate 25, rapid cooling is performed, and the image sensor 16 is quickly returned to a state in which imaging can be performed. In addition, since the heat radiating sheet 26 is compressed and deformed in the direction of the optical axis O in the contact state of the heat radiating sheet, an unreasonable force acts on the image sensor supporting plate 15 and the image sensor 16 fixed to the support plate and the X movable frame 10. do not do. That is, the heat dissipation sheet 26 functions as a stress relaxation material.

  A path through which heat of the image sensor 16 of the camera shake correction unit 3B of the present embodiment is radiated to the outside air will be described with reference to a heat transfer path diagram of FIG. The heat of the image sensor 16 is transmitted from the image sensor support plate 15 to the X movable frame 10, the X drive unit 9, the Y movable frame 8, the Y drive unit 7, and the fixed member 5, while air from the image sensor support plate 15 or In the contact thermal resistance state, heat is transferred to the heat radiating sheet 26, the heat radiating plate 11, the penetrating member 12, and the fixing member 5, and further from the fixing member 5 to the camera exterior body 2 via the support portion 6 and further directly to the outside air. Or is dissipated through air.

  The heat transfer from the image sensor support plate 15 to the heat radiating sheet 26 and the heat radiating plate 11 is a relatively narrow distance Q between the image sensor support plate 15 and the heat radiating sheet 26 as described above in a normal photographing state. Therefore, the imaging element 16 can be prevented from becoming high temperature. Furthermore, in the unlikely event that the image sensor 16 is in an abnormally high temperature state, the image sensor support plate 15 and the heat radiating sheet 26 come into contact with each other, so that a contact thermal resistance acts between them, making it easy to transfer heat. Become. Accordingly, the image sensor 16 quickly falls from an abnormally high temperature state and is in a state where a good image signal can be output.

  As described above, according to the digital camera incorporating the camera shake correction unit 3B of the present embodiment, in addition to the effects of the first embodiment described above, if the image sensor 16 becomes abnormally hot, the image sensor Rapid cooling is possible when the heat radiating sheet 26 on the heat radiating plate 25 side contacts the support plate 15. Further, when the heat dissipation sheet 26 comes into contact with the image sensor support plate 15, abnormal contact force is prevented from acting on the image sensor support plate 15, the image sensor 16, the X movable frame 10, etc., and the camera shake correction unit 3B operates. There will be no defects or damage.

  As a modified example of the camera shake correction unit 3B of the present embodiment, it is possible to propose a configuration in which a contact sensor is arranged on a flat surface portion of the heat radiation sheet 26 that can come into contact with the imaging element support plate 15. In this modified example, when the image sensor 16 is in an abnormally high temperature state and the contact sensor detects that the heat dissipation sheet 26 is in contact with the image sensor support plate 15 as shown in FIG. Control to prohibit.

  Therefore, according to this modification, when the image sensor 16 reaches an abnormally high temperature state, the malfunction of the camera shake correction unit 3 due to the heat sensor 11 pressing the image sensor support plate 15 via the heat radiating sheet 26 is generated. And an incomplete camera shake correction processing operation can be prohibited.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  The camera shake correction unit of the present invention can be used as a camera shake correction unit in which heat from the image sensor or the image sensor control electronic component is sufficiently dissipated and a good image signal is obtained.

5 ... Fixing member 7 ... Y drive section (first drive means)
8 ... Y movable frame (first movable member)
9 ... X drive frame (second drive means)
10 ... X movable frame (second movable member)
11, 25 ... Radiating plate (heat radiating member)
DESCRIPTION OF SYMBOLS 12 ... Penetration member 16 ... Image pick-up element 20 ... Control board unit (printed circuit board to which the electronic component was fixed)
22 ... Electronic component 31 ... Shooting lens (shooting optical system)

Claims (4)

In a camera shake correction unit that performs a camera shake correction operation by displacing an image sensor for receiving a subject image formed by a photographing optical system and generating image data,
A fixing member;
At least one of the image sensor and / or a printed circuit board to which an electronic component arranged in parallel to the light receiving surface of the image sensor is fixed;
A first movable member supported displaceably with respect to the fixed member along a first direction in a plane parallel to the light receiving surface of the imaging element;
First driving means for driving the first movable member;
The first movable member and the first movable member can be displaced along the first direction. The light receiving surface of the image sensor and / or the plane parallel to the plane of the printed circuit board can be displaced with respect to the first direction. A second movable member that is supported so as to be displaceable with respect to the first movable member along a second direction intersecting with each other, and that supports the imaging element;
Second driving means for driving the second movable member;
A heat dissipating member disposed at a position facing the second movable member;
A penetrating member made of a shape memory alloy for connecting and fixing the heat dissipation member to the fixing member;
A camera shake correction unit comprising: The camera shake correction unit according to claim 1, wherein a flat plate area of the heat radiating member facing the second movable member is increased with respect to a cross-sectional area of the penetrating member. 2. The camera shake correction unit according to claim 1, wherein a plurality of the penetrating members are provided and fixed to the fixing member via a female screw member. The camera shake correction unit according to claim 1, wherein the penetrating member is deformed in a direction in which a separation distance between the imaging element and the heat radiating member decreases when an ambient temperature rises.

Images