JP5145750B2 - Electronic device, camera and projector device - Google Patents

Description

  The present invention relates to a light source device, an electronic device, a camera, a lighting device, and a projector device having a heat radiating device for radiating heat generated from a light source.

2. Description of the Related Art Conventionally, an electronic device including a string-like heat conduction member that thermally connects a heating element built in an electronic device and a heat radiating body that radiates heat generated by the heating element is known (for example, , See Patent Document 1).
JP 2000-151164 A

  The electronic device described in Patent Document 1 has a problem that heat generated by the built-in heating element cannot be efficiently radiated because the amount of heat conducted through the heat conducting member is small.

(1) The electronic device of the present invention is a portable electronic device, and a light source that irradiates illumination light toward an illumination target, and the electronic device that is substantially orthogonal to the back surface of the light source and that houses the light source Anisotropy of thermal conductivity in which a heat conduction path is formed from a first surface joined to the heat sink and a second surface joined to the heat sink. A first heat conduction path having a first high thermal conductivity direction substantially orthogonal to the back surface of the light source, and substantially perpendicular to the first heat conduction path. And a second heat conduction path having a second high heat conductivity direction substantially orthogonal to the first high heat conductivity direction .
(2) The electronic device according to any one of claims 1 to 8 is a camera.
(3) The electronic device according to any one of claims 1 to 8 is a projector device.

  ADVANTAGE OF THE INVENTION According to this invention, the heat which a light source generate | occur | produces can be efficiently transmitted to the heat sink which has a thermal radiation surface substantially orthogonal to the back surface of a light source.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view of an electronic camera with a projector (hereinafter referred to as an electronic camera with a PJ) 1 according to an embodiment of the present invention as viewed obliquely from the front. The electronic camera 1 with a PJ has a projector device that projects projection information such as an image toward a screen or the like disposed in front. This projector apparatus has an LED (Light Emitting Diode) light source as described later. Since the LED light source generates a large amount of heat, it must be efficiently radiated to the outside.

  As shown in FIG. 1, a photographing lens 11 and a projector projection window 12 are provided on the front surface of the housing 10 of the electronic camera 1 with PJ. A release button 13 is provided on the upper surface of the housing 10. A subject luminous flux enters the photographing lens 11 and a projection image is projected from the projector projection window 12.

  FIG. 2 is a front view of an electronic camera with a PJ according to an embodiment of the present invention. As shown by a dotted line in FIG. 2, a projection module 20 having a projector function is built in the vicinity of the projector projection window 12 on the front surface of the housing 10. The projection module 20 is a quadrangular prism-shaped module whose bottom surface is a substantially square having a side of about 10 mm. The projection module 20 is arranged with the longitudinal direction vertically (up and down), and a heat conducting member 30 is joined to the bottom surface (lower surface). The heat conducting member 30 conducts heat generated from the projection module 20 to the housing 10. Note that the projection module 20 in FIG. 2 represents the size of the rectangular column in the longitudinal direction longer than the actual size in order to easily illustrate the internal configuration.

  The projection module 20 will be described with reference to FIG. 3 is a cross-sectional view taken along the line AA in FIG. The projection module 20 includes an LED 23 (LED substrate 27), a condensing optical system 24, a polarizing plate 25, a PBS (polarizing beam splitter) block 26, a liquid crystal panel 22, and a projection optical system 21. Of the above members, members other than the projection optical system 21 are integrally formed in the shell member 28. Specifically, the LED substrate 27 is disposed on the lower open surface of a member 28 obtained by bending an aluminum thin plate member into a U shape. The LED substrate 27 is made of an aluminum substrate, and the LED 23 that is a light emitting element is mounted on a pattern formed on the insulating layer of the substrate.

  Further, the condensing optical system 24 and the PBS block 26 are bonded to the shell member 28. The PBS block 26 is a polarization beam splitter in which a polarization separation unit 26a that forms an angle of 45 degrees with respect to an incident optical axis is sandwiched between two triangular prisms. The surface 26b of the PBS block 26 is subjected to non-reflective processing such as black processing, for example.

  A polarizing plate 25 is disposed on the lower surface of the PBS block 26 (the surface on the condensing optical system 24 side), and a liquid crystal panel 22 composed of a reflective liquid crystal element (LCOS) is disposed on the upper surface of the PBS block 26. Established.

  The project function by the projection module 20 having the above configuration will be described. In the projection module 20 configured as described above, a drive current is supplied to the LEDs 23 on the LED substrate 27 via a harness and a pattern (not shown). The power consumed by the LED board 27 is about 2W. The LED 23 emits light with brightness according to the drive current toward the condensing optical system 24. The condensing optical system 24 makes the LED light substantially parallel light and enters the polarizing plate 25. The polarizing plate 25 converts (or extracts) incident light into linearly polarized light, and emits the converted (or extracted) polarized light toward the PBS block 26.

  A polarized light beam (for example, P-polarized light) incident on the PBS block 26 passes through the PBS block 26 and illuminates the liquid crystal panel 22. The liquid crystal panel 22 includes a plurality of pixels on which red, green, and blue filters are formed, and is driven to generate a color image. When the light transmitted through the liquid crystal layer of the liquid crystal panel 22 enters the liquid crystal panel 22, the light travels upward in the liquid crystal layer, is reflected by the reflective surface of the liquid crystal panel 22, and then travels downward in the liquid crystal layer to liquid crystal. The light is ejected from the panel 22 and again incident on the PBS block 26. Since the liquid crystal layer to which the voltage is applied functions as a phase plate, the light incident again on the PBS block 26 is a mixed light of modulated light that is S-polarized light and unmodulated light that is P-polarized light. The PBS block 26 reflects (folds) only the modulated light, which is the S-polarized component, of the re-incident light beam by the polarization separation unit 26a, and emits it as projection light toward the right projection optical system 21.

  Next, the heat conductive member 30 joined to the projection module 20 will be described. The heat conducting member 30 is configured by a three-dimensional block surrounded by a quadrilateral. Since the heat conducting member 30 is a member constituting a heat conducting path, it is preferable to reduce the thermal resistance. Therefore, processing for reducing the cross section of the heat conduction path (for example, cutting the surface of the heat conduction member 30 to form fins) is avoided. Further, the thickness of the heat conducting member 30 (the length in the vertical direction in FIG. 3 and the short side of the quadrilateral forming the surface 30b) is not less than a predetermined value (for example, 5 mm) and the length of the heat conducting member 30 is long. The length (the long side of the quadrilateral that forms the surface 30a in FIG. 3) is suppressed to twice or less the thickness.

  The surface 30 a of the heat conducting member 30 is surface bonded to the back surface of the LED substrate 27. Specifically, a filler having high thermal conductivity is filled between the surface 30a of the heat conductive member 30 and the back surface of the LED substrate 27, or a heat conductive seal member is sandwiched between the surfaces. In order to increase the heat conductivity from the LED substrate 27, the surface 30 a of the heat conducting member 30 has an area larger than the bonding surface of the LED substrate 27. The surface 30b of the heat conducting member 30 is fixed to the inside of the housing front surface portion 10a of the electronic camera 1 with a PJ by a screw or an adhesive (not shown) so that the entire surface is in surface contact. Thereby, the heat conducting member 30 also has a function of fixing the projection module 20.

  The heat generated from the LED 23 is conducted from the surface 30a of the heat conducting member 30 to the heat conducting member 30, and is conducted from the surface 30b of the heat conducting member 30 to the housing front surface portion 10a of the electronic camera 1 with PJ. And the heat | fever generate | occur | produced from LED23 is thermally radiated from the housing | casing front part 10a of the electronic camera 1 with PJ. That is, as shown in FIG. 3, the heat generated from the LED 23 is conducted to the housing front surface portion 10 a of the electronic camera 1 with a PJ that has a heat radiating surface substantially orthogonal to the back surface of the LED 23 and radiates the outside.

  As shown in FIG. 4, the material of the heat conducting member 30 is a carbon fiber composite material 40 in which carbon fibers 42 are oriented and dispersed in an aluminum matrix 41. The carbon fiber composite material 40 has thermal conductivity anisotropy, and the thermal conductivity in the orientation direction of the carbon fibers 42 is higher than those in other directions. Such a direction with a high thermal conductivity is hereinafter referred to as a high thermal conductivity direction. The thermal conductivity in the high thermal conductivity direction (arrow 43) of the carbon fiber composite material 40 is 700 W / mK, which is higher than the thermal conductivity of aluminum (238 W / mK) and the thermal conductivity of copper (398 W / mK).

  The heat conducting member 30 is manufactured by combining two blocks made of the carbon fiber composite material 40 described above. As shown in FIG. 5A, the two blocks 51 and 52 constituting the heat conducting member 30 have the same size and shape, and both are triangular prisms having a right-angled triangular cross-sectional shape. The high thermal conductivity direction of one block 51 is a direction perpendicular to the surface 51a constituting one side of the right-angled sides of the right triangle. The high thermal conductivity direction of the other block 52 is a direction perpendicular to the surface 52a constituting the other side of the right-angled sides of the right triangle. Then, the slopes 51b and 52b of the two blocks 51 and 52 are joined with an adhesive or solder so that the high thermal conductivity directions of the two blocks 51 and 52 are substantially perpendicular. Then, as shown in FIG. 5B, the heat conducting member 30 is formed by joining the two blocks 51 and 52 into one block. Here, the surface 51a of the block 51 becomes a surface 30a which is a joint surface with the LED substrate 27, and the surface 52a of the block 52 becomes a surface 30b which is a fixing surface to the housing front surface portion 10a of the electronic camera 1 with PJ. As shown in FIG. 5B, the high thermal conductivity direction of the heat conducting member 30 bends at right angles (arrow 53) from the surface direction of the surface 30a to the surface direction of the surface 30b. By using such a heat conducting member 30, heat conduction (see arrow 31 in FIG. 3) to the housing front surface portion 10a of the electronic camera 1 with PJ that is substantially orthogonal to the back surface of the LED substrate 27 is facilitated.

According to the embodiment described above, the following operational effects can be obtained.
(1) By using the heat conduction member 30 which is a thermal conductivity anisotropic block, the electronic camera 1 with PJ has a heat radiation surface substantially orthogonal to the back surface of the LED 23 and radiates heat generated by the LED 23 to the outside. The heat generated from the LED 23 can be efficiently conducted to the housing front surface portion 10a. Also, heat generated from the LED 23 can be efficiently radiated even in a small space such as in the electronic camera 1 with PJ.

(2) Since the heat conducting member 30 is a fixing member that fixes the projection module 20, the heat conducting member 30 has a large cross-sectional area in order to obtain sufficient strength to fix the projection module 20. Thereby, the amount of heat flowing through the heat conducting member 30 can be increased, and the heat generated by the LED 23 can be efficiently conducted to the housing front surface portion 10a of the electronic camera 1 with PJ.

(3) The heat conducting member 30 has a three-dimensional shape having at least a surface 30a to be bonded to the back surface of the LED 23 and a surface 30b to be bonded to the housing front surface portion 10a of the electronic camera 1 with PJ. The entire area of the surface 30b is bonded to the housing front surface portion 10a of the electronic camera 1 with PJ. Thereby, the amount of heat flowing through the heat conducting member 30 can be increased, and the heat generated by the LED 23 can be efficiently conducted to the housing front surface portion 10a of the electronic camera 1 with PJ.

(4) The heat conduction member 30 has a high heat conductivity direction substantially orthogonal to the back surface of the LED 23 and a high heat conductivity direction substantially orthogonal to the heat conductivity anisotropic block 51 and the high heat conductivity direction of the heat conductivity anisotropic block 51. A thermal conductivity anisotropic block 52 having a thermal direction, and the thermal conduction member 30 transmits heat generated by the LED 23 to the PJ through the thermal conductivity anisotropic block 51 and the thermal conductivity anisotropic block 52. Heat was transferred to the front surface 10a of the case of the electronic camera 1 with the attached electronic camera. This makes it easier for heat to flow in a right-angle direction (the direction of arrow 31 in FIG. 3), and has a heat dissipation surface that is substantially orthogonal to the back surface of the LED 23, so that the heat generated by the LED 23 is dissipated to the outside. The heat generated from the LED 23 can be efficiently conducted to the housing front surface portion 10a.

(5) A carbon fiber composite material 40 in which carbon fibers 42 are oriented and dispersed in an aluminum matrix 41 is used for the heat conducting member 30. Since the carbon fiber 42 has a very high thermal conductivity, the heat generated from the LED 23 can be efficiently conducted in the direction of the high thermal conductivity.

(6) Since the heat of the LED 23 is radiated from the housing 10 of the electronic camera 1 with PJ, the heat can be efficiently radiated by the cooling action of the outside air.

The above embodiment can be modified as follows.
(1) The direction of high thermal conductivity of the heat conducting member 30 was a direction that bends at right angles to the surface direction of the back surface of the LED 23 as indicated by an arrow 31 in FIG. However, as indicated by an arrow 61 in FIG. 6, the direction of high thermal conductivity of the heat conducting member 60 may be the direction of the heat radiating surface of the housing front surface portion 10a of the electronic camera 1A with PJ with respect to the back surface of the LED 23 (heat conduction). First modified example of member). In the first modification of the heat conducting member, the heat conducting member 60 is a triangular prism having a right triangle cross section. The LED substrate 27 is bonded to the surface 60a having one of the two sides forming the right triangle of the cross section, and the housing front surface portion 10a of the electronic camera with PJ 1A is bonded to the surface 60b having the other side. To do. In this case, the orientation direction of the carbon fibers 42 is substantially parallel to the surface 60c constituting the hypotenuse of the right triangle of the cross section.

  Thus, the heat generated from the LED 23 is efficiently conducted to the housing front portion 10a of the electronic camera 1A with a PJ that has a heat radiating surface substantially orthogonal to the back surface of the LED 23 and radiates heat generated by the LED 23 to the outside. be able to.

  The heat conducting member 30 is composed of two blocks 51 and 52, whereas the heat conducting member 60 can be composed of one block. Therefore, material costs, assembly costs, and the like can be reduced. Furthermore, since the heat conducting member 60 has a shorter heat conduction path than the heat conducting member 30, the heat generated from the LED 23 is more efficiently conducted to the housing front surface portion 10a of the electronic camera with PJ 1A. be able to.

(2) As indicated by an arrow 71 in FIG. 7, the high thermal conductivity direction of the heat conducting member 70 is changed from the surface direction of the back surface of the LED 23 to the surface direction of the heat radiation surface of the housing front surface portion 10a of the electronic camera 1B with PJ. It may be changed gradually so that the heat conducting member 30 has a curved heat transfer path (second modification of the heat conducting member). Thus, the heat generated from the LED 23 is efficiently conducted to the housing front surface portion 10a of the electronic camera 1B with a PJ that has a heat radiating surface substantially orthogonal to the back surface of the LED 23 and radiates heat generated by the LED 23 to the outside. be able to. In the second modification of the heat conducting member, the heat conducting member 70 is created by aligning the directions of the curved carbon fibers 42 and dispersing them in the aluminum 41.

(3) The material of the heat conductive member 30 was a carbon fiber composite material 40 in which carbon fibers 42 are oriented and dispersed in an aluminum matrix 41. However, any carbon fiber composite material may be used as long as it has a thermal conductivity anisotropy. It is not limited to 40. For example, a composite material including a predetermined matrix and a columnar or fibrous substance having a higher thermal conductivity than the matrix may be used. Since heat flows preferentially through a columnar or fibrous substance having a higher thermal conductivity than the matrix, the composite material has thermal conductivity anisotropy.

(4) The material of the heat conducting member 30 was a carbon fiber composite material 40 composed of an aluminum matrix 41 and carbon fibers 42. However, if it is the carbon fiber composite material 40, the material of a matrix is not limited to embodiment. For example, other metals such as copper may be used for the matrix. Further, a substance other than metal, for example, a resin such as an epoxy resin may be used for the matrix. By using such a substance as a matrix, it is possible to protect the carbon fibers 42 that are susceptible to brittle fracture.

  Even if a substance having a low thermal conductivity such as a resin is used as a matrix, the thermal conductivity of the carbon fiber 52 is very high, so that the thermal conductivity can be increased as a carbon fiber composite material. Further, by using an insulator such as a resin, the insulating property of the carbon fiber composite material can be ensured, which may be convenient. By using resin, the weight of the heat conducting member can be reduced.

(5) The heat conduction member 30 can efficiently conduct heat generated from the light source to the heat radiating surface for the light sources other than the LEDs 23. Therefore, the light source used for the heat conducting member 30 is not limited to the LED 23.

(6) A light source, a heat radiating plate having a heat radiating surface substantially orthogonal to the back surface of the light source, radiating heat generated by the light source to the outside, and heat transferring heat generated by the light source from the back surface of the light source to the heat radiating plate If it is an electronic device which has a light source device provided with the conductivity anisotropic block, it will not be limited to an electronic camera with PJ. Even in an electronic device other than an electronic camera with a PJ, the light source device can efficiently dissipate heat generated from the light source in a small space. For example, the projector device may include the above-described light source device. Also. An LED may be used as a light source of illumination light for illuminating a subject for shooting at night. In this case as well, the heat generated from the LED must be efficiently radiated to the outside. Therefore, the light source device according to the embodiment of the present invention may be provided for a camera equipped with an LED and an illumination device such as an electronic flash device.

  The above description is merely an example, and the present invention is not limited to the configuration of the above embodiment.

It is the figure which looked at the electronic camera with PJ by one Embodiment of this invention from diagonally forward. It is the figure which looked at the electronic camera with PJ by one Embodiment of this invention from the front. 3 is a cross-sectional view taken along the line AA in FIG. It is a figure for demonstrating the material of a heat conductive member. It is a figure for demonstrating the structure of a heat conductive member. It is a figure for demonstrating the 1st modification of a heat conductive member. It is a figure for demonstrating the 2nd modification of a heat conductive member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Electronic camera 10 with PJ ... Case 10a ... Case front part 12 ... Projector projection window 23 ... LED
27 ... LED substrates 30, 60, 70 ... heat conducting member 40 ... carbon fiber composite material 41 ... aluminum 42 ... carbon fiber 51, 52 ... block

Claims (10)

A portable electronic device,
A light source that emits illumination light toward an illumination target;
A heat dissipating plate that is substantially orthogonal to the rear surface of the light source and forms a part of the casing of the electronic device in which the light source is accommodated ;
A thermal conductivity anisotropic block in which a heat conduction path is configured from a first surface joined to the back surface of the light source to a second surface joined to the heat sink;
The thermal conductivity anisotropic block is joined to the first heat conduction path having a first high thermal conductivity direction substantially orthogonal to the back surface of the light source and the first heat conduction path at a substantially right angle, and An electronic apparatus comprising: a second heat conduction path having a second high heat conductivity direction substantially orthogonal to the one high heat conductivity direction . The electronic device according to claim 1,
The electronic apparatus according to claim 1, wherein the anisotropic thermal conductivity block is a fixing member for fixing the light source. The electronic device according to claim 1,
The thermal conductivity anisotropic block has a three-dimensional shape having at least a first surface joined to a back surface of the light source and a second surface joined to the heat sink, and the first surface is a surface of the light source. An electronic apparatus having an area equal to or larger than an area to be bonded to the back surface, wherein the entire surface of the second surface is bonded to the heat sink. The electronic device according to any one of claims 1 to 3,
The thermal conductivity anisotropic block includes a first thermal conductivity anisotropic block having a high thermal conductivity direction substantially orthogonal to a back surface of the light source, and a high thermal conductivity of the first thermal conductivity anisotropic block. A second thermal conductivity anisotropic block having a high thermal conductivity direction substantially orthogonal to the rate direction,
The thermal conductivity anisotropic block transfers heat generated by the light source to the heat radiating plate through the first thermal conductivity anisotropic block and the second thermal conductivity anisotropic block. An electronic device characterized by that. The electronic device according to any one of claims 1 to 3,
Electronic apparatus, characterized in that the high thermal conductivity direction of the thermal conductivity anisotropy block is the direction of the radiating surface of the radiating plate against the back surface of the light source. The electronic device according to any one of claims 1 to 5,
The electronic apparatus according to claim 1, wherein the anisotropic thermal conductivity block is a composite material including a matrix and a columnar or fibrous substance having a higher thermal conductivity than the matrix. The electronic device according to claim 6,
It said matrix is a metal, material of the columnar or fibrous electronic apparatus characterized in that it is a carbon fiber. The electronic device according to claim 6,
It said matrix is a resin, material of the columnar or fibrous electronic apparatus characterized in that it is a carbon fiber. The electronic device according to any one of claims 1 to 8 is a camera . The electronic device according to any one of claims 1 to 8 is a projector device .

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