JP2008090163A - Electronic apparatus and electronic camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly dissipate heat generated by a heating member of an electronic apparatus. <P>SOLUTION: The electronic apparatus includes a heat transfer member 35 of a three-dimensional shape having at least a first surface 35a bonded to the heating member 30 and a second surface 35b bonded to an internal surface 1 of a case. The first surface 35a has an area not less than the area to be bonded to the heating member 30, and the entire surface of the second surface 35b is bonded to the internal surface 1 of the case. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic device and an electronic camera.

  An electronic device having a projection function is known (see Patent Document 1).

JP 2005-250392 A

  In this type of electronic apparatus, when the brightness of the projection light is increased, a problem of heat generation by the light source unit occurs.

(1) An electronic device according to the present invention is a three-dimensional heat transfer member having at least a first surface bonded to a heat generating member and a second surface bonded to an inner side surface of a housing. The surface has an area equal to or larger than the area to be joined to the heat generating member, and the second surface has a heat transfer member to be joined to the inner side surface of the housing.
(2) In the electronic device according to claim 1, the shape of the heat transfer member may be a hexahedron surrounded by a substantially quadrilateral.
(3) In the electronic device according to claim 2, the length of the short side of the quadrilateral that forms the second surface is equal to or longer than the length of the long side of the quadrilateral that forms the first surface. It is preferable that
(4) In the electronic device according to any one of claims 1 to 3, a hole to be screwed with a screw is provided on the second surface, and the second surface and the inner surface of the housing are fixed with the screw. It is preferable.
(5) In the electronic apparatus according to any one of claims 1 to 4, the heat generating member may be a substrate on which a light emitting element is mounted.
(6) In the electronic device according to any one of claims 1 to 5, the heat transfer member is preferably made of aluminum.
(7) In the electronic device according to any one of claims 1 to 6, the casing is preferably made of metal.
(8) In the electronic device according to any one of claims 1 to 7, thermal conductivity is provided between the first surface and the heat generating member, and between the second surface and the inner side surface of the housing. It is preferable that the members are joined together.
(9) An electronic camera according to the present invention includes the heat transfer member according to any one of claims 1 to 8.
(10) In the electronic camera according to the ninth aspect, it is preferable that the second surface of the heat transfer member is joined to a surface on the front side of the housing.

  In the electronic apparatus according to the present invention, the heat generated by the heat generating member can be appropriately radiated.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an electronic camera with a projector (hereinafter referred to as a PJ built-in electronic camera) according to an embodiment of the present invention. In FIG. 1, a photographing optical system 12 and a projection optical system 21 are provided on the front surface 1 of the housing of the electronic camera with a built-in PJ. A release button 11 is provided on the top surface of the PJ built-in electronic camera. The PJ built-in electronic camera is a projection unit that is built on a desk or the like, or is placed on a cradle (not shown) and directed toward a screen disposed in front of the PJ built-in electronic camera. Projection information such as an image by 20 (projector) is projected from the projection optical system 21.

  2 is a view of the PJ built-in electronic camera of FIG. 1 as viewed from the bottom side. In FIG. 2, a liquid crystal monitor 14 is provided on the rear surface 2 of the housing of the PJ built-in electronic camera. The housing front surface 1 of the PJ built-in electronic camera has a curved surface. Of the housing front surface 1 and the housing rear surface 2, at least the housing front surface 1 is made of metal.

  According to FIGS. 1 and 2, the imaging unit 10 (indicated by a broken line) is disposed on the right side. Specifically, the photographing optical system 12 is disposed at the upper right portion of the front surface 1 of the housing, and the image sensor 13 is disposed near the right bottom surface. The projection unit 20 (indicated by a broken line) is arranged side by side with the imaging unit 10 at the upper end of the approximate center (center in the left-right direction) of the housing of the PJ built-in electronic camera.

  The imaging optical system 12 constituting the imaging unit 10 is a refractive optical system that guides the subject luminous flux incident from the front surface 1 side of the housing to the imaging device 13 by bending the light beam in the camera housing. By using such a refractive optical system, the space between the housing front surface 1 and the housing rear surface 2 of the electronic camera with a built-in PJ is made thin.

  The heat conduction member 35 constituting the projection unit 20 is fixed to the inside of the front surface 1 of the housing of the electronic camera with a built-in PJ by screws 37. The surface 35b of the heat conducting member 35 on the front surface 1 side of the housing is curved so as to follow the inner surface of the front surface 1 of the housing. The surface 35b of the heat conductive member 35 is screwed to the front surface 1 of the housing with the heat conductive seal member 36 (FIG. 3) interposed therebetween, so that the heat conductive member 35 is fixed so as to be in surface contact with the front surface 1 of the housing. The Further, the surface 35 d on the housing rear surface 2 side of the heat conducting member 35 is processed to be flat along the surface of the back plate 14 b of the liquid crystal monitor 14. The back plate 14b is configured by a metal panel member. In a state where the housing front surface 1 and the housing rear surface 2 are joined, the back plate 14b and the heat conducting member 35 are configured to contact each other with a heat conducting seal member (not shown) interposed therebetween.

  The detail of the projection part 20 is demonstrated with reference to FIG. 3 and FIG. 3 is a view of the optical system of the projection unit 20 as viewed from the left side in FIG. FIG. 4 is a view of the optical system of FIG. 3 as viewed from the front side, and the housing front surface 1 and the projection optical system 21 are omitted.

  The optical system of the projection unit 20 is configured as a quadrangular prism-shaped module (hereinafter referred to as a projection module) having a substantially square shape with a side of about 10 mm. The projection module is arranged in the longitudinal direction vertically (up and down), and the heat conducting member 35 is joined to the bottom surface (lower surface). 3 and 4 show the size of the rectangular column in the longitudinal direction longer than the actual size for easy understanding of the internal configuration.

  The projection module includes an LED 23 (LED substrate 30), 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 40. Specifically, the LED substrate 30 is disposed on the lower open surface of the member 40 obtained by bending an aluminum thin plate member into a U-shape. The LED substrate 30 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 40. 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 heat conducting member 35 is formed of, for example, a three-dimensional aluminum block surrounded by a quadrilateral. The material of the heat conducting member 35 is not limited to aluminum but may be any member having high heat conductivity such as copper or graphite. Since the heat conducting member 35 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 35 to form fins) is avoided. Further, the thickness of the heat conductive member 35 (the vertical size in FIG. 3 and the short side of the quadrilateral forming the surface 35b) is not less than a predetermined value (for example, 5 mm), and the length of the heat conductive member 35 is long. The length (the long side of the quadrilateral that forms the surface 35a in FIG. 3) is suppressed to twice or less the thickness.

  The heat conducting member 35 is surface-bonded to the LED substrate 30 so as to improve heat conduction from the heat generating member (the LED substrate 30 in this embodiment). Specifically, a filler having high thermal conductivity is filled between the surface 35a of the heat conductive member 35 and the LED substrate 30, or a heat conductive seal member is sandwiched. A screw hole 35 c is provided in the surface 35 b of the heat conducting member 35. As described above, the surface 35b of the heat conductive member 35 and the front surface 1 of the housing are fixed by the screws 37 so as to be in surface contact with the heat conductive seal member 36 therebetween.

  In the projection module having the above configuration, a drive current is supplied to the LED 23 on the LED substrate 30 through a harness and a pattern (not shown). The power consumed by the LED board 30 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. The projection optical system 21 and the lens barrel are disposed on the housing front surface 1 side.

  It is preferable to affix a seal made of a heat insulating material on a predetermined range including the screw 37 on the front surface 1 of the housing described above (at least wider than the area in contact with the heat conducting member 35). It is possible to cover the screw 37 with the sticker seal so that the screw 37 cannot be seen, to prevent the screw 37 from loosening, and to prevent the user from directly touching the portion of the front surface 1 where the temperature is likely to rise.

According to the embodiment described above, the following operational effects can be obtained.
(1) The LED substrate 30 that generates heat when the LED 23 is turned on is surface-bonded to one surface 35a of a heat conducting member 35 constituted by a hexahedral block, and the other surface 35b of the heat conducting member 35 is made of a metal housing of the PJ built-in electronic camera. Surface bonding was performed on the inner surface of the body (front surface 1 of the housing). Since the heat spreader is not included in the heat conduction path, the thermal resistance from the LED substrate 30 to the heat conduction member 35 to the front surface 1 of the housing is reduced, and the heat generated by the LEDs 23 can be efficiently radiated to the space outside the housing. Further, since it does not include a heat spreader, it contributes to miniaturization, and is particularly effective for a thin housing electronic camera having a refraction type photographing optical system.

(2) The housing front surface 1 has a larger housing area than the housing back surface 2 on which the liquid crystal monitor 14 is disposed. By joining the heat conducting member 35 to the subject-side surface (that is, the housing front surface 1) having a large housing area, heat can be efficiently radiated to the space outside the housing as compared with the case of joining to the housing rear surface 2.

(3) The heat conductive member 35 is made of an aluminum block having high heat conductivity, and a conductive seal member is sandwiched between the LED substrate 30 and the heat conductive member 35 and between the heat conductive member 35 and the metal housing surface. It was made to join with. As a result, the thermal resistance of the heat conduction path is further lowered, and the heat dissipation efficiency can be further increased.

(4) The area of the surface 35a of the heat conducting member 35 is larger than the area to be joined to the LED substrate 30, and all the faces 35b of the heat conducting member 35 are surface joined to the housing front face 1a. At this time, the thickness of the heat conduction member 35 (vertical size in FIG. 3) is secured to 5 mm or more, and the length of the heat conduction member 35 (lateral size in FIG. 3) is suppressed to twice or less the thickness. The thermal resistance of the heat conduction path can be reduced.

(5) Since the heat conducting member 35 and the metal housing surface are screwed, there is no gap between the heat conducting member 35 and the metal housing surface even when the metal housing surface is bent, and the heat conducting path A state with low thermal resistance can be maintained.

(6) Of the surfaces of the heat conducting member 35, the other surface 35d that is not bonded to the LED substrate 30 or the metal housing surface is brought into contact with the surface of the back plate 14b of the liquid crystal monitor 14 with the conductive sealing member interposed therebetween. Thus, the heat generated by the LED 23 can be efficiently radiated from the liquid crystal monitor 14 to the space inside and outside the housing.

(Modification 1)
The shape of the heat conducting member 35 is not necessarily a hexahedral shape. For example, when a part of an aluminum sphere is cut and the remaining original sphere is further cut at a surface intersecting with the previous cut surface, an original sphere having two surfaces is obtained. Even if one cut surface of the original sphere is joined to the LED substrate 30 and the other cut surface is joined to the housing front surface 1, the same effects as the above (1) to (6) can be obtained.

(Modification 2)
A slide cover for protecting the photographing optical system 12 and the projection optical system 21 may be provided on the front surface 1 of the PJ built-in electronic camera. FIG. 5 is a view of the electronic camera with a built-in PJ in this case as viewed from the front. A slide cover 15 indicated by a solid line represents an open state (use position), and a slide cover 15a indicated by a broken line represents a closed state (storage position).

  According to FIG. 5, a predetermined range including the screw 37 (at least wider than the area in contact with the heat conducting member 35) is always covered with the slide cover 15 (15a) regardless of the position of the slide cover 15 (15a). Thereby, the screw 37 is made invisible, the user does not directly touch the portion where the temperature is likely to rise on the front surface 1 of the housing, and the photographing optical system 12 and the projection optical system 21 can be protected at the storage position. it can.

(Modification 3)
FIG. 6 is a diagram illustrating another PJ built-in electronic camera having the projection unit 20 </ b> A and the imaging unit 10. In FIG. 6, the projection unit 20 </ b> A (indicated by a broken line) is arranged with the longitudinal direction at the right end toward the housing of the PJ built-in electronic camera. The imaging unit 10 (indicated by a broken line) is arranged side by side with the projection unit 20A with the longitudinal direction being vertical.

  The direction of joining of the projection module and the heat conducting member 35 in the projection unit 20 </ b> A is rotated by 90 degrees around the optical axis emitted from the LED 30 compared to the projection unit 20. Thereby, the projection light by the projection unit 20A is emitted in the right direction in a state where the heat conducting member 35 is screwed to the front surface 1 of the housing.

(Modification 4)
FIG. 7 is a diagram illustrating another PJ built-in electronic camera having the projection unit 20 </ b> B and the imaging unit 10. In FIG. 7, the projection unit 20 </ b> B (indicated by a broken line) is disposed with the longitudinal direction being set laterally at the substantially center upper end portion of the housing of the PJ built-in electronic camera. The imaging unit 10 (indicated by a broken line) is arranged side by side with the projection unit 20B with the longitudinal direction being horizontal.

  The direction of joining of the projection module and the heat conducting member 35 in the projection unit 20B is rotated by 180 degrees around the optical axis emitted from the LED 30 as compared to the projection unit 20A. Thereby, the projection light by the projection unit 20B is emitted upward in a state where the heat conducting member 35 is screwed to the front surface 1 of the housing.

  Also in the case of the said modification 3 and the modification 4, the effect (1)-(6) of the said embodiment is obtained, respectively.

  In Modification 3 and Modification 4, it is preferable to stick a seal made of a heat insulating material on a predetermined range including at least the screw 37 on the front surface 1 of the housing (at least wider than the area in contact with the heat conducting member 35). . Alternatively, a slide cover that protects the photographing optical system 12 is provided on the front surface 1 of the housing, and a predetermined range that always includes the screw 37 regardless of whether the slide cover is open or closed (at least larger than the area in contact with the heat conducting member 35). Is preferably covered with a slide cover.

(Modification 5)
Although an example in which the housing front surface 1 has a curved surface has been described, the present invention may be applied to a case where the housing front surface 1 is a flat surface.

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

  The present invention has been described with reference to an electronic camera with a built-in PJ. However, as long as the projector 20 (20A or 20B) is mounted, the projector, a mobile phone with a built-in PJ, a PDA with a built-in PJ (personal digital assistant), a built-in PJ. It can also be applied to electronic devices such as recording / playback machines.

It is the figure which looked at the electronic camera with a built-in PJ according to an embodiment of the present invention from the front. It is the figure which looked at the electronic camera with a built-in PJ in FIG. 1 from the bottom side. It is the figure which looked at the optical system of the projection part from the left side in FIG. It is the figure which looked at the optical system of Drawing 3 from the front. It is the figure which looked at the PJ built-in electronic camera of the modification 2 from the front. It is the figure which looked at the PJ built-in electronic camera of the modification 3 from the front. It is the figure which looked at the PJ built-in electronic camera of the modification 4 from the front.

Explanation of symbols

1 ... front surface 23 ... LED
30 ... LED substrate 35 ... heat conduction member 35a ... surface 35b in contact with the LED substrate ... surface 35c in contact with the front surface of the casing ... screw hole 36 ... heat conduction seal member

Claims (10)

  A three-dimensional heat transfer member having at least a first surface to be joined to the heat generating member and a second surface to be joined to the inner side surface of the housing, wherein the first surface is joined to the heat generating member. An electronic apparatus comprising: a heat transfer member having an area equal to or larger than an area, wherein the entire surface of the second surface is bonded to an inner surface of the housing. The electronic device according to claim 1,
The shape of the heat transfer member is a hexahedron surrounded by a substantially quadrilateral. The electronic device according to claim 2,
The length of the short side of the quadrilateral that constitutes the second surface is not less than ½ of the length of the long side of the quadrilateral that constitutes the first surface. In the electronic device as described in any one of Claims 1-3,
An electronic device, wherein a hole to be screwed with a screw is provided in the second surface, and the second surface and an inner surface of the housing are fixed with a screw. In the electronic device as described in any one of Claims 1-4,
The electronic device, wherein the heat generating member is a substrate on which a light emitting element is mounted. In the electronic device as described in any one of Claims 1-5,
The electronic device, wherein the heat transfer member is made of aluminum. In the electronic device as described in any one of Claims 1-6,
The electronic device is characterized in that the casing is made of metal. In the electronic device as described in any one of Claims 1-7,
An electronic apparatus, wherein the first surface and the heat generating member, and the second surface and the inner surface of the housing are joined with a heat conductive member interposed therebetween, respectively.   An electronic camera comprising the heat transfer member according to claim 1. The electronic camera according to claim 9,
An electronic camera, wherein the second surface of the heat transfer member is joined to a front surface of the housing.

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