Image Projection Device

Abstract

To provide an image projection device which can efficiently radiate the heat generated from the inside of the image projection device.SOLUTION: An image projection device according to an aspect of the present invention comprises: a projection unit which projects an image; a support member which supports the projection unit; an exterior member which covers the projection unit and the support member; a first heat conduction material which is provided between the projection unit and the support member; and a second heat conduction material which is provided between the support member and the exterior member. The projection unit has an image generation part which generates the image. The projection unit is arranged on a projection unit arrangement surface in the support member. The first heat conduction material is provided such that at least a portion of the first heat conduction material is superimposed on the image generation part when the projection unit arrangement surface is plan-viewed.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to an image projection device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, in an image projection device, a configuration for dissipating heat generated by the image projection device is known.

[0003] As such a configuration, a configuration has been described in which heat generated by a projector module inside an image projection device, including a light source and related electronic components, is diffused from a heat collection section to a thermal diffusion section by utilizing heat transfer through contact (see, for example, Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional technologies, heat is diffused from the entire projector module, which is the projection unit that projects the image, and there is a concern that heat cannot be efficiently dissipated from components included in the projection unit that may be heat sources.

[0005] An object of the present invention is to provide an image projection device capable of efficiently dissipating heat generated from within the image projection device. [Means for solving the problem]

[0006] An image projection device according to one embodiment of the present invention comprises a projection unit that projects an image, a support member that supports the projection unit, an exterior member that covers the projection unit and the support member, a first thermally conductive material provided between the projection unit and the support member, and a second thermally conductive material provided between the support member and the exterior member, wherein the projection unit has an image generation unit that generates the image, the projection unit is arranged on a projection unit mounting surface of the support member, and the first thermally conductive material is arranged such that at least a portion of the first thermally conductive material overlaps with the image generation unit when the projection unit mounting surface is viewed in a plane. Effect of the Invention

[0007] According to the present invention, it is possible to provide an image projection device capable of efficiently dissipating heat generated from inside the image projection device. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of an image projection device according to an embodiment, viewed from the z-direction side; [Diagram 2] 1 is a perspective view of an image projection device according to an embodiment, viewed from the z negative direction side; [Diagram 3] 1 is a perspective view of an image projection device according to an embodiment, as viewed from the x-negative direction side; [Figure 4] FIG. 1 is a front view of an image projection device according to an embodiment, as viewed from the x-positive direction. [Diagram 5] Exploded perspective view of an image projection device [Figure 6] FIG. 1 is a perspective view showing a state in which the image projection device is held; [Figure 7] FIG. 1 is a side view showing a state in which the image projection device is held; [Figure 8] Block diagram of an image projection device according to a first embodiment. [Figure 9] A longitudinal sectional view of an image projection device [Figure 10] FIG. 1 is an exploded perspective view showing the installation position of a first thermal conductive material [Figure 11] An exploded perspective view showing the installation position of the third thermal conductive material [Figure 12] An exploded perspective view showing the installation positions of the second and third thermal conductive materials. [Figure 13] FIG. 13 is a perspective view showing the installation position of the second thermal conductive material; [Figure 14] FIG. 1 is a bottom view of an image projection device showing a positional relationship between a second thermally conductive material and a third thermally conductive material; [Figure 15] FIG. 1 is a partially enlarged top view of an image projection device showing the positional relationship of first to third thermally conductive materials; [Figure 16] FIG. 11 is a partially enlarged perspective view showing a first example of a positional relationship between a first thermally conductive material and a projection unit; [Figure 17] FIG. 11 is a partially enlarged perspective view showing a second example of the positional relationship between the first thermally conductive material and the projection unit; [Figure 18] FIG. 13 is a partially enlarged perspective view showing a third example of the positional relationship between the first thermally conductive material and the projection unit; [Figure 19] FIG. 13 is a partially enlarged perspective view showing a fourth example of the positional relationship between the first thermally conductive material and the projection unit; [Figure 20] FIG. 13 is a partially enlarged perspective view showing a fifth example of the positional relationship between the first thermally conductive material and the projection unit; [Figure 21] FIG. 13 is a partially enlarged perspective view showing a sixth example of the positional relationship between the first thermally conductive material and the projection unit; [Figure 22] FIG. 13 is a diagram showing an example of the arrangement of a first thermal conductive material according to a modified example. [Diagram 23] FIG. 1 is an exploded perspective view showing the location of the fourth thermal conductive material. [Figure 24] FIG. 2 is an exploded perspective view showing the installation positions of the first heat insulating member and the switch board; [Diagram 25] The first example of the configuration around the fourth thermal conductive material viewed from the x-positive side. [Figure 26] A diagram of the second example of the configuration around the fourth thermal conductive material viewed from the x-positive side. [Figure 27] A diagram of the third example of the configuration around the fourth thermal conductive material viewed from the x-positive side. [Figure 28] FIG. 4 is a diagram of the fourth example of the configuration around the fourth thermal conductive material viewed from the x-positive side. [Figure 29] View of the control board from outside the top cover [Diagram 30] View of the control board from inside the top cover [Diagram 31] An exploded perspective view showing the configuration around the battery [Diagram 32] Block diagram of an image projection device according to a second embodiment. [Diagram 33] Block diagram of the functional configuration of an MCU according to a second embodiment [Diagram 34] Diagram explaining current control by charge / discharge control IC [Diagram 35] Diagram explaining temperature control by MCU [Diagram 36] Flowchart showing temperature control processing by the MCU DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components in each drawing are denoted by the same reference numerals as much as possible, and duplicated description will be omitted as appropriate.

[0010] In the following description, the x, y, and z directions are perpendicular to each other. The x direction is the projection direction of the image projection device 1. The y direction is the left-right direction of the projected image of the image projection device 1, and is typically the horizontal direction. The z direction is the up-down direction of the projected image of the image projection device 1, and is typically the vertical direction.

[0011] [First embodiment] <Overall configuration example of image projection device 1> FIG. 1 is a perspective view of the image projection device 1 according to the embodiment, as viewed from the z positive direction side. FIG. 2 is a perspective view of the image projection device 1 according to the embodiment, as viewed from the z negative direction side. FIG. 3 is a perspective view of the image projection device 1 according to the embodiment, as viewed from the x negative direction side. FIG. 4 is a front view of the image projection device 1 according to the embodiment, as viewed from the x positive direction side. FIG. 5 is an exploded perspective view of the image projection device 1. FIG. 6 is a perspective view showing the image projection device 1 in a held state. FIG. 7 is a side view showing the image projection device 1 in a held state.

[0012] The image projection device 1 shown in FIGS. 1 to 7 is a so-called handy type image projection device that can project an image while being held in one hand by an operator of the image projection device 1 (hereinafter simply referred to as the operator).

[0013] The image projection device 1 has a projection unit 3, a support member 8, an upper cover 21, and a lower cover 22. The projection unit 3 projects an image by irradiating light to the outside. This light is called projected light, and this image is called a projected image. The support member 8 is a member that supports the projection unit 3. Each of the upper cover 21 and the lower cover 22 is an example of an exterior member that covers the projection unit 3 and the support member 8.

[0014] The image projection device 1 also has a main body 2. The main body 2 is formed in a shape that can be held in one hand. The main body 2 includes an upper cover 21, a lower cover 22, etc., and houses the projection unit 3 and the support member 8 in the space covered by the upper cover 21 and the lower cover 22.

[0015] The main body includes a protrusion 2D which protrudes from a portion of the space covered by the upper cover 21 and the lower cover 22. The protrusion 2D protrudes along the longitudinal direction (x direction) of the main body 2. The protrusion 2D is formed integrally with the main body 2, and the internal space is in communication. The relationship between the main body 2 and the protrusion 2D can also be expressed as the main body 2 having the protrusion 2D.

[0016] The projection unit 3 is installed on the protrusion 2D on the tip side in the x-positive direction of the main body 2 so that the projection direction is along the longitudinal direction (x-direction) of the main body 2. The projection unit 3 has a lens unit 3A and is installed so that the lens unit 3A is exposed from an opening 2C provided at the tip 2A in the x-positive direction of the protrusion 2D, and is installed on the main body 2 so that the up-down direction of the image projected from the lens unit 3A is along the z-direction and the left-right direction of the image is along the y-direction.

[0017] When projecting light L to the outside, the axis passing through the lens center of lens unit 3A is defined as optical axis L1. Projection unit 3 has optical elements such as lenses, and the "optical axis of projection unit 3" is, for example, the optical axis center of these optical elements. It can also be said that convex portion 2D protrudes along the optical axis of projection unit 3.

[0018] As shown in Figs. 4, 6, 7, etc., the protrusion 2D includes an upper portion 2Du, a lower portion 2Dd, a side portion 2Ds, and a front portion 2Df. The upper portion 2Du is an example of a first portion, and the lower portion 2Dd is an example of a second portion facing the upper portion 2Du. The side portion 2Ds and the front portion 2Df are each an example of a third portion intersecting the upper portion 2Du and the lower portion 2Dd, respectively. The upper portion 2Du refers to a portion on the z positive direction side of the upper cover 21, and the lower portion 2Dd refers to a portion on the z negative direction side of the lower cover 22. The side portion 2Ds refers to each portion on the y positive direction side and the y negative direction side of the lower cover 22. The front portion 2Df refers to a portion on the x positive direction side of the lower cover 22. The front portion 2Df can also be said to be a portion on the lower cover 22 on the projection direction side of the projection image.

[0019] 6 and 7 show the image projection device 1 being held by an operator's hand H. The projection unit 3 also has a dial 15 for adjusting focus, which is exposed to the outside through an opening provided in a part of the protruding portion 2D. The operator can adjust the focus of the projected image by operating the dial 15.

[0020] Next, the internal structure of the image projection device 1 will be described with reference to FIG.

[0021] 5, the image projection device 1 has a control board 6 and a battery 7 inside the main body 2. The control board 6 and the battery 7 have a substantially rectangular parallelepiped shape. The control board 6 is an example of a control member in which a control unit 60 is provided.

[0022] The control unit 60 controls the operation of the entire image projection device 1, including the operation of the projection unit 3. The control unit 60 can be physically configured as a computer system in which a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a storage device, an interface, and the like are connected via a bus. The various functions of the control unit 60 are realized by loading predetermined computer software onto hardware such as the CPU and RAM, thereby reading and writing data from and to the RAM and storage device under the control of the CPU, and operating other components such as the projection unit 3 and external devices via the interface.

[0023] The battery 7 is a power source that supplies power to the projection unit 3 and the control unit 60, and is a plate-shaped secondary battery.

[0024] As shown in FIG. 5, the projection unit 3, the control board 6, and the battery 7 are fixed to a support member 8 and attached to the upper cover 21 of the main body 2 in an integrated state.

[0025] With this configuration, the projection unit 3, control board 6, and battery 7 are supported by being pressed and fixed to the support member 8, and can be attached and detached in the vertical direction (z direction) with respect to the upper cover 21 of the main body 2. Furthermore, by removing the lower cover 22 from the main body 2, the image projector 1 can be disassembled with the projection unit 3, control board 6, and battery 7 integrally connected to the upper cover 21 via the support member 8. Being able to remove them as a unit in this way improves maintainability (ease of replacement work). For example, it becomes easier to replace the battery 7 or to perform maintenance work by removing it once.

[0026] 1 and other figures, in addition to the projection button 4, a power button 11 as a second button and a button group 12 are provided on the surface of the main body 2 on the z positive side. The power button 11 is a button for switching on and off the power supply to the image projection device 1 and for operating the main power function. The power button 11 may have other functions in addition to the main power function, and may perform other functions instead of the main power function depending on the state of the image projection device 1.

[0027] Button group 12 includes a plurality of buttons for operating each function of the other projection device. Power button 11 is arranged on the negative x side of projection button 4, and button group 12 is arranged on the negative x side of power button 11, with each button being arranged along the y direction. Button group 12 is a group consisting of a plurality of buttons, and in this embodiment, consists of three buttons.

[0028] 3, connectors 13 such as a USB connector and an HDMI (registered trademark) are arranged so as to be exposed on the end surface 2B on the negative X-direction side of the main body 2, and are configured to be connectable to various external devices via wiring. The connectors 13 are provided on the control board 6, for example.

[0029] 1 to 4, 6 and 7, the main body 2 is provided with an upper tapered portion 21A and a lower tapered portion 22A. The upper tapered portion 21A is a tapered portion extending from the upper surface of the main body 2 to the side surface. The lower tapered portion 22A is a tapered portion extending from the lower surface B of the main body 2 or the lower portion 2Dd of the protruding portion 2D to the side surface of the main body 2.

[0030] Providing the upper tapered portion 21A and the lower tapered portion 22A in the main body 2 in this way makes it easier for the user to hold the main body 2. Furthermore, handy projectors (image projection devices 1) are often carried around in bags or clothing pockets. Tapers such as the upper tapered portion 21A and the lower tapered portion 22A make it less likely that corners of the device will get caught in a bag, pocket, or the like when taking the device in or out.

[0031] In this embodiment, as shown in FIG. 1 and other figures, the upper tapered portion 21A and the lower tapered portion 22A are provided around the entire periphery of the image projection device 1, but may be provided only on a part of the periphery.

[0032] FIG. 8 is a block diagram of the image projection device 1. As shown in FIG. 8, the projection unit 3 has a light-emitting unit 31 and a display device 32. The light-emitting unit 31 has LEDs (Light Emitting Diodes) 31R, 31G, and 31B. The LEDs 31R, 31G, and 31B are light sources of red (R), green (G), and blue (B), respectively. The display device 32 is an example of an image generating unit that generates a projection image using the light emitted from the light-emitting unit 31. In this embodiment, a DMD (Digital Micromirror Device) is used as the display device 32.

[0033] The light-emitting unit 31 and the display device 32 may be replaced with other elements capable of fulfilling their respective functions. That is, although an LED is used as the light-emitting unit 31, a halogen lamp or the like may also be used. Furthermore, although a DMD is used as the display device 32, a liquid crystal display device may also be used. The control unit 60 can control the light emission by the light-emitting unit 31 and the generation of a projected image by the display device 32, etc.

[0034] In FIG. 8, the information transmission system of the image projection device 1 is indicated by a solid line, the power supply system is indicated by a thick solid line, and the optical system is indicated by a dotted line. As shown in FIG. 8, the information transmission system of the image projection device 1 outputs a control signal from the control board 6 to the light-emitting unit 31 and the display device 32 of the projection unit 3. In addition, in the power supply system of the image projection device 1, power is first supplied from the battery 7 to the control board 6, and then power is supplied from the control board 6 to the light-emitting unit 31 and the display device 32 of the projection unit 3 via the wiring 14. In particular, in this embodiment, a switching unit 18 is disposed on the wiring 14 between the control board 6 and the projection unit 3. The switching unit 18 can be switched between an on state and an off state by an operation input of the projection button 4. FIG. 8 shows the switching unit 18 in an off state.

[0035] When the switching unit 18 is in the ON state, it supplies power to the light-emitting unit 31 and the display device 32 of the projection unit 3, and when the switching unit 18 is in the OFF state, it stops the power supply to the light-emitting unit 31 and the display device 32 of the projection unit 3. Meanwhile, regardless of whether the switching unit 18 is ON or OFF, power is always supplied to the control board 6 from the battery 7. As a result, the switching unit 18 can switch between the projection state and non-projection state of the projection unit 3, i.e., between turning on / off the light-emitting unit 31 and operating / stopping the display device 32, in response to an operation input to the projection button 4, while maintaining the activation state of the control board 6.

[0036] 9 is a vertical cross-sectional view of the image projection device 1. In the image projection device 1, the positional relationship between the projection unit 3, the control board 6, the battery 7, and the support member 8 housed in the main body 2 can be briefly expressed as follows. That is, the projection unit 3 is installed on a protrusion 2D that protrudes from the main body 2 in the projection direction of light by the projection unit 3 (x-positive direction) (including a configuration in which at least a part of the tip side of the projection unit 3 is arranged on the protrusion 2D).

[0037] Any two of the projection unit 3, the control board 6, and the battery 7 are arranged in parallel in the direction of the optical axis of light (x direction) inside the main body 2, and any two of the projection unit 3, the control board 6, and the battery 7 are arranged in line in the vertical direction (z direction) of the projection image of the projection unit 3 inside the main body 2. Of such positional relationships, particularly in this embodiment, as shown in FIG. 9, the control board 6 is arranged on the opposite side of the projection direction (x negative direction side) from the projection unit 3, and the battery 7 is arranged below the control board 6 in the vertical direction. That is, like the control board 6, the battery 7 is also arranged on the opposite side of the projection direction (x negative direction side) from the projection unit 3.

[0038] By positioning the projection unit 3, control board 6, and battery 7 in this way, two of the projection unit 3, control board 6, and battery 7 are arranged horizontally (x direction) side by side, and the remaining one is arranged overlapping the two horizontal ones in the vertical direction (z direction). With this configuration, the image projection device 1 can be miniaturized to a compact size that is easy to hold.

[0039] A support member 8 is also disposed inside the main body 2. The support member 8 is a partition member that separates at least the battery 7 from the projection unit 3 and the control board 6. In particular, in this embodiment, as shown in Fig. 8, the support member 8 is a plate-shaped member, and is disposed so that a first surface 85 faces the negative z direction side of a pair of main surfaces, and a second surface 86 faces the positive z direction side. The battery 7 is disposed on the first surface 85 side of the support member 8, and the control board 6 and the projection unit 3 are disposed on the second surface 86 side opposite the first surface 85.

[0040] The support member 8 has a projection unit arrangement surface 86a on the second surface 86 side, and the projection unit 3 is arranged on the projection unit arrangement surface 86a. The projection unit arrangement surface 86a is parallel to the optical axis. In this embodiment, the support member 8 supports the projection unit 3 by arranging and fixing the projection unit 3 on the projection unit arrangement surface 86a. The projection unit arrangement surface 86a faces the widest surface of the projection unit 3. It can also be said that the projection unit arrangement surface 86a is the surface closest to the projection unit 3.

[0041] The control plate arrangement surface 86b faces the widest surface of the control board 6. The surface of the support member 8 opposite the control plate arrangement surface 86b faces the widest surface of the battery 7, and can also be called the battery arrangement surface 85b. The surface facing a certain surface is used to distinguish it from other surfaces of the support member 8, and does not deny the existence of other members between the certain surface and the surface facing the certain surface.

[0042] In this way, by separating the internal space of the main body 2 so that only the battery 7 is housed in a separate room using the support member 8, the projection unit 3 and control board 6 can be kept away from the heat emitted by the battery 7 and are thus insulated from the heat.

[0043] In addition, in order to facilitate the explanation of the entire image projection device 1, only some of the components of the image projection device 1 are shown in Fig. 9, but the image projection device 1 has components for dissipating heat such as first to fourth thermally conductive materials in addition to the components shown in Fig. 9. These components will be described in detail below.

[0044] <Example of heat dissipation configuration around projection unit 3> The light-emitting unit 31 and the display device 32 included in the projection unit 3 are heat sources that generate heat by their own driving. If the heat of the projection unit 3 due to the light-emitting unit 31 and the display device 32 is transferred to the skin of an operator who holds or operates the image projection device 1, there is a concern that the operator may feel uncomfortable. In this embodiment, the heat generated by the projection unit 3 is dissipated to a desired location that is less frequently touched by the skin of the operator of the image projection device 1, thereby reducing the discomfort felt by the operator. Note that in this embodiment, the term "heat transfer" is used to mainly refer to the transfer of heat, and the term "heat dissipation" is used to mainly refer to the dissipation of heat. In other words, heat transfer mainly refers to the process of heat transfer, and heat dissipation mainly refers to the result of heat transfer.

[0045] 10 to 21 are diagrams for explaining an example of a heat dissipation configuration around the projection unit. Fig. 10 is an exploded perspective view showing the installation position of the first thermally conductive material 101, Fig. 11 is an exploded perspective view showing the installation position of the third thermally conductive material 103, and Fig. 12 is an exploded perspective view showing the installation positions of the second thermally conductive material 102 and the third thermally conductive material 103. Fig. 13 is a perspective view showing the installation position of the second thermally conductive material 102, Fig. 14 is a bottom view of the image projection device 1 showing the positional relationship between the second thermally conductive material 102 and the third thermally conductive material 103, and Fig. 15 is a partially enlarged top view showing the positional relationship between the first thermally conductive material 101, the second thermally conductive material 102, and the third thermally conductive material 103.

[0046] Figures 16 to 21 are partially enlarged oblique views showing the positional relationship between the first thermal conductive material 101 and the projection portion 3, with Figure 16 showing a first example, Figure 17 showing a second example, Figure 18 showing a third example, Figure 19 showing a fourth example, Figure 20 showing a fifth example, and Figure 21 showing a sixth example.

[0047] As shown in Figs. 10 to 21, the image projection device 1 has a first thermally conductive material 101, a second thermally conductive material 102, and a third thermally conductive material 103. Fig. 14 shows the first thermally conductive material 101, the second thermally conductive material 102, and the third thermally conductive material 103 inside the image projection device 1 as viewed from the bottom side (z negative direction side) of the image projection device 1. Fig. 15 shows the first thermally conductive material 101, the second thermally conductive material 102, and the third thermally conductive material 103 around the projection unit 3 as viewed from the top side of the image projection device 1 with the top cover 21 omitted. In Figs. 14 and 15, the first thermally conductive material 101 is indicated by a broken line, the second thermally conductive material 102 is indicated by a one-dot chain line, and the third thermally conductive material 103 is indicated by a two-dot chain line.

[0048] As shown in FIG. 10, FIG. 14 to FIG. 21, etc., the first thermally conductive material 101 is provided so that at least a part of the first thermally conductive material 101 overlaps with the display device 32 when the projection unit arrangement surface 86a is viewed in a plan view. In this embodiment, viewing the projection unit arrangement surface 86a in a plan view means viewing the projection unit arrangement surface 86a from its approximately normal direction. This arrangement allows the first thermally conductive material 101 and the display device 32 to be closer to each other, so that the heat generated by the display device 32 is more efficiently transferred to the first thermally conductive material 101. Note that the approximately normal direction does not mean that the normal direction is strictly defined, and a deviation from the normal direction that is generally recognized as an error is allowed. This point is also applicable to the case where the term approximately normal direction is used hereinafter.

[0049] 14 and 15, the second thermally conductive material 102 is provided such that at least a portion of the second thermally conductive material 102 overlaps with the first thermally conductive material 101 when the projection unit arrangement surface 86a is viewed in plan. In the example of FIGS. 14 and 15, the first thermally conductive material 101 is included in the second thermally conductive material 102, so that the second thermally conductive material 102 and the first thermally conductive material 101 overlap. This arrangement allows the first thermally conductive material 101 and the second thermally conductive material 102 to be closer to each other, so that the heat of the first thermally conductive material 101 is transferred to the second thermally conductive material 102 more efficiently.

[0050] Moreover, the third thermally conductive material 103 is provided such that, when the projection unit arrangement surface 86a is viewed in plan, at least a portion of the third thermally conductive material 103 overlaps with each of the first thermally conductive material 101 and the second thermally conductive material 102. In the example of Fig. 14 and Fig. 15, a portion of the first thermally conductive material 101 on the positive x-direction side overlaps with the third thermally conductive material 103, so that the third thermally conductive material 103 and the first thermally conductive material 101 overlap. Moreover, the third thermally conductive material 103 is included within the second thermally conductive material 102, so that the third thermally conductive material 103 and the second thermally conductive material 102 overlap.

[0051] This arrangement allows the first thermally conductive material 101 and the third thermally conductive material 103 to be closer to each other, so that the heat of the first thermally conductive material 101 is more efficiently transferred to the third thermally conductive material 103. In addition, the third thermally conductive material 103 and the second thermally conductive material 102 can be closer to each other, so that the heat of the third thermally conductive material 103 is more efficiently transferred to the second thermally conductive material 102.

[0052] 16 to 18, the image projection device 1 includes LEDs 31R, 31G, and 31B on the side surface of the projection unit 3 as the light-emitting unit 31. In the example shown in Figs. 19 to 21, the image projection device 1 includes a three-wavelength integrated LED as the light-emitting unit 31.

[0053] (First thermal conductive material 101) The first thermally conductive material 101 is a member containing a material with high thermal conductivity, and is provided between the projection unit 3 and the support member 8 in the z direction. The first thermally conductive material 101 is in contact with the support member 8, and the projection unit 3 is fixed to the support member 8 via the first thermally conductive material 101.

[0054] From the viewpoint of efficient heat transfer, the thermal conductivity of the first thermal conductive material 101 is preferably higher than that of the support member 8, and more preferably 1.5 [W / m·k] or more. The first thermal conductive material 101 preferably includes a graphite sheet. A graphite sheet is a member obtained by processing graphite, an allotrope of carbon, into a sheet shape. In addition, from the viewpoint of efficient heat transfer, the display device 32, which is a heat source, and the first thermal conductive material 101 are preferably approximately the same size. As an example, the first thermal conductive material 101 is disposed so that the surface area of ​​the surface of the display device 32 that contacts the display device 32 is as large as possible within ±10% of the surface area of ​​the surface of the display device 32 that contacts the first thermal conductive material 101.

[0055] However, the first thermally conductive material 101 is not limited to a sheet-like member such as a graphite sheet, and may be a cubic member that is thicker than the sheet-like member or a fluid material such as a paste, as long as it has high thermal conductivity. The thermal conductivity can be measured by a standard measurement method that complies with JIS standards. These points are the same for the third thermally conductive material 103 and the fourth thermally conductive material 104 described later.

[0056] The first thermally conductive material 101 is preferably configured to include an elastic body. With this configuration, when an impact is applied to the image projection device 1 from the outside, the first thermally conductive material 101 absorbs the impact, thereby preventing damage to the projection unit 3 and the like. In addition, the first thermally conductive material 101 is preferably adhesive (tacky). This allows the first thermally conductive material 101 to be used as an adhesive or bonding material, reducing the number of parts for fixing the projection unit 3, such as double-sided tape and screws, and suppressing unnecessary thickness. For example, a graphite sheet having a thickness of about 1 mm and having elasticity and adhesiveness can be used as the first thermally conductive material 101.

[0057] 16 , the first thermally conductive material 101 may be provided such that, when the projection unit arrangement surface 86a is viewed in plan, at least a portion of the first thermally conductive material 101 overlaps with the display device 32. This arrangement allows the first thermally conductive material 101 and the display device 32 to be closer to each other, so that heat generated by the display device 32, which is a heat source, is transferred to the first thermally conductive material 101 more efficiently.

[0058] The arrangement of the first thermally conductive material 101 can be appropriately determined according to the position or orientation of the display device 32. For example, in the example shown in Fig. 17, the display device 32 having a longitudinal direction in the y direction is provided on the negative x-direction side of the projection unit 3. In the example shown in Fig. 18, the display device 32 having a longitudinal direction in the x direction is provided on the positive y-direction side of the projection unit 3. The arrangement of the first thermally conductive material 101 can be determined according to the orientation and position of these display devices 32.

[0059] 19, the first thermally conductive material 101 may be provided such that at least a portion of the first thermally conductive material 101 overlaps with the light-emitting unit 31 when the projection unit arrangement surface 86a is viewed in plan. This arrangement allows the first thermally conductive material 101 and the light-emitting unit 31 to be closer to each other, so that the heat generated by the light-emitting unit 31 is transferred to the first thermally conductive material 101 more efficiently.

[0060] The arrangement of the first thermally conductive material 101 can also be appropriately determined according to the position or orientation of the light-emitting unit 31. For example, in the example shown in Fig. 20, the light-emitting unit 31 is provided on the negative x-direction side of the projection unit 3, and in the example shown in Fig. 21, the light-emitting unit 31 is provided on the positive y-direction side of the projection unit 3. The arrangement of the first thermally conductive material 101 can be determined according to the positions of these light-emitting units 31.

[0061] The size and thickness of the first thermally conductive material 101 can also be appropriately determined depending on the size and heat generation amount of the projection unit 3, the display device 32, and the light-emitting unit 31, respectively.

[0062] 19 to 21 show an example in which all of the light-emitting sections of the three colors are in contact with the first thermally conductive material 101, but the present invention is not limited thereto. For example, a light-emitting section of one of the three colors may be in contact with the first thermally conductive material 101, and the light-emitting sections of the other two colors may be arranged on the side surface of the projection section 3 without being in contact with the first thermally conductive material 101, as shown in FIGS. 16 to 18. Furthermore, both the light-emitting section 31 and the display device 32 are arranged in an area overlapping with the third thermally conductive material 103.

[0063] (Second thermal conductive material 102) The second thermally conductive material 102 is a member containing a material with high thermal conductivity, and is provided between the support member 8 and the lower cover 22 in the z direction. The second thermally conductive material 102 is in contact with the lower cover 22, and the support member 8 is fixed to the lower cover 22 via the second thermally conductive material 102. The second thermally conductive material 102 can be formed to contain, for example, copper foil. Copper foil has high thermal conductivity, so it can efficiently transfer heat inside the image projection device 1, and is very thin, so it can be placed in a small space. The second thermally conductive material 102 is fixed to the lower cover 22 using an adhesive member or the like.

[0064] 12, the second thermally conductive material 102 is provided not only on the inside of the lower portion 2Dd of the lower cover 22, but also on the inside of the side portion 2Ds and the inside of the front portion 2Df. The inside means the side facing the inside of the image projection device 1. In FIG. 12, of the second thermally conductive material 102, the one provided on the inside of the side portion 2Ds is indicated as the second thermally conductive material 102s, and the one provided on the inside of the front portion 2Df is indicated as the second thermally conductive material 102f.

[0065] In other words, the second thermally conductive material 102 is provided such that at least a portion of the second thermally conductive material 102 overlaps with the side surface portion 2Ds when viewed from above.

[0066] (Third thermal conductive material 103) The third thermally conductive material 103 is a member containing a material with high thermal conductivity, and is provided between the support member 8 and the second thermally conductive material 102 in the z direction. The third thermally conductive material 103 is provided so as to be in contact with both the support member 8 and the second thermally conductive material 102. The third thermally conductive material 103 preferably has a higher thermal conductivity than the support member 8, and preferably has a thermal conductivity of 1.5 [W / m·k] or more. Like the first thermally conductive material 101, the third thermally conductive material 103 can be formed by containing, for example, a graphite sheet.

[0067] Here, FIG. 22 is a diagram showing an arrangement example of the first thermal conductive material 101 according to the modified example. As shown in FIG. 22, the support member 8a has claws 110a, 110b, and 110c. Each of the claws 110a, 110b, and 110c has a surface that intersects with the projection unit arrangement surface 86a, and is provided so that each intersecting surface can face each of the LEDs 31R, 31G, and 31B in a pair. In this embodiment, each of the intersecting surfaces is a surface that is approximately perpendicular to the projection unit arrangement surface 86a. In this configuration, each of the first thermal conductive materials 101b, 101c, and 101d in FIG. 22 is provided between the LEDs 31R, 31G, and 31G and the paired claws 110a, 110b, and 110c. The LEDs 31R, 31G, and 31R may be paired with any of the claws 110a, 110b, and 110c.

[0068] (Heat dissipation around the projection unit 3) In this embodiment, heat from the light-emitting unit 31, the display device 32, etc. is transferred to the support member 8 through the first thermally conductive material 101. The heat transferred to the support member 8 is mainly transferred to the third thermally conductive material 103, which has a higher thermal conductivity than the support member 8, and the heat transfer to the support member 8 is suppressed. The heat transferred to the third thermally conductive material 103 is transferred to the second thermally conductive material 102.

[0069] Since the second thermally conductive material 102 is provided on the inside of each of the lower portion 2Dd, the side portion 2Ds, and the front portion 2Df, the heat transferred to the second thermally conductive material 102 is dissipated to the lower portion 2Dd, the side portion 2Ds, and the front portion 2Df of the image projection device 1. In this way, heat generated from inside the image projection device 1, such as heat from the display device 32, can be efficiently dissipated through the first thermally conductive material 101, the third thermally conductive material 103, and the second thermally conductive material 102.

[0070] Furthermore, in the image projection device 1, when an operator holds the image projection device 1 in one hand, the lower portion 2Dd, the side portion 2Ds, and the front portion 2Df are each parts that are less likely to be touched by the operator's skin, whether the operator holds the image projection device 1 in the right hand or the left hand. Therefore, even if heat is transferred to these parts, the operator feels less uncomfortable. On the other hand, because heat transfer to the support member 8 is suppressed, heat dissipation to parts of the image projection device 1 other than the lower portion 2Dd, the side portion 2Ds, and the front portion 2Df that are likely to be touched by the operator's skin is reduced. As a result, the transfer of heat from the image projection device 1 to the operator is suppressed, and the operator feels less uncomfortable.

[0071] It is more preferable that the accessible surfaces of the upper cover 21 and the lower cover 22 are formed in a matte finish. Here, matte finish refers to a surface state with fine granular protrusions that resembles the skin of a pear. The accessible surfaces of the upper cover 21 and the lower cover 22 may also be textured. A textured surface refers to a surface formed by texturing. Texturing is a type of surface treatment, and is a processing method that physically creates a wrinkled pattern.

[0072] Making the touchable surface a matte surface or a textured surface reduces the contact area between the skin of an operator holding image projection device 1 and upper cover 21 and lower cover 22. This makes it difficult for heat generated by image projection device 1 to be transmitted to the operator's skin, further reducing the discomfort felt by the operator due to the heat of image projection device 1 being transmitted to the operator.

[0073] <Example of heat dissipation configuration around control board 6> While the image projection device 1 is projecting an image, the control board 6 is in continuous operation, and therefore the temperature of the control board 6 continues to rise. In this embodiment, the heat generated by the control board 6 is dissipated to a portion of the image projection device 1 that is less likely to be touched by the skin of the operator, thereby reducing discomfort to the operator, and heat transfer to semiconductors and the like mounted on the control board 6 is suppressed, thereby preventing damage to the semiconductors and the like.

[0074] Fig. 23 to Fig. 31 are diagrams for explaining the heat transfer configuration around the control board 6. Fig. 23 is an exploded perspective view showing the installation position of the fourth thermally conductive material 104, and Fig. 24 is an exploded perspective view showing the installation positions of the first heat insulating member 105 and the switch board 10. Fig. 25 to Fig. 28 are diagrams showing the configuration around the fourth thermally conductive material 104 as viewed from the x-positive direction, with Fig. 25 showing a first example, Fig. 26 showing a second example, Fig. 27 showing a third example, and Fig. 28 showing a fourth example.

[0075] Fig. 29 is a view of the control board 6 viewed from the outside of the upper cover 21, and Fig. 30 is a view of the control board 6 viewed from the inside of the upper cover 21. In Fig. 29 and Fig. 30, the control board 6, the first heat insulating member 105, and the switch board 10 attached to the upper cover 21 are each viewed from the outside of the upper cover 21 in Fig. 29, and viewed from the inside of the upper cover 21 in Fig. 30. Fig. 31 is an exploded perspective view showing the configuration around the battery 7.

[0076] As shown in FIGS. 23 to 31, the image projection device 1 includes an operation button group 9, a switch board 10, a fourth thermally conductive member 104, a first heat insulating member 105, and a second heat insulating member .

[0077] The operation button group 9 is an example of an operation member in which a plurality of operation buttons including the projection button 4, the power button 11, and the button group 12 are integrally formed. However, the operation member may have only one operation button, or may have operation buttons and operation switches other than those mentioned above. The indicator 16 supports the power button 11, and also displays the state of the main power supply visually for the operator by lighting up, etc.

[0078] The switch board 10 is an example of an operation processing member that outputs a signal corresponding to an operation input by an operator or the like using the operation button group 9. The switch board 10 is provided such that at least a portion of the switch board 10 overlaps with the control board 6 when the control board arrangement surface 86b is viewed in a plan view. In this embodiment, viewing the control board arrangement surface 86b in a plan view means viewing the control board arrangement surface 86b from a direction substantially normal to the control board arrangement surface 86b.

[0079] The fourth thermally conductive material 104 is a member containing a material with high thermal conductivity, and is provided between the control board 6 and the upper cover 21 in the z direction. The fourth thermally conductive material 104 is fixed to the upper cover 21 by screws or the like while being in contact with the control board 6. The fourth thermally conductive material 104 is constituted by containing, for example, a graphite sheet or copper foil.

[0080] 25, the fourth thermally conductive material 104 includes a flat thermally conductive material 104A and a thermally conductive material 104B having a bent portion. For example, the flat thermally conductive material 104A can be made of a graphite sheet, and the thermally conductive material 104B can be made of copper foil. The fourth thermally conductive material 104 is in contact with both the control board 6 and the upper cover 21. With this arrangement, heat generated by the control board 6 is dissipated to the upper cover 21 through the fourth thermally conductive material 104 more efficiently.

[0081] 29 and 30 , the fourth thermally conductive material 104 is attached to the upper cover 21 such that at least a portion of the fourth thermally conductive material 104 overlaps with the control board 6 when the control board arrangement surface 86b is viewed in plan view. This arrangement allows the fourth thermally conductive material 104 and the control board 6 to be closer to each other, so that heat generated by the control board 6 is transferred to the fourth thermally conductive material 104 more efficiently.

[0082] The z positive side of the fourth thermally conductive material 104 contacts the upper cover 21, and the z negative side of the fourth thermally conductive material 104 contacts the control board 6. Heat generated by the control board 6 is transferred from the fourth thermally conductive material 104 to the upper cover 21, and then dissipated to the upper cover 21.

[0083] The fourth thermally conductive material 104 is preferably configured to include an elastic body. With this configuration, the gap between the fourth thermally conductive material 104 and the control board 6 is reduced, and the contact area between them is increased, so that heat generated by the control board 6 is more efficiently dissipated to the upper cover 21. Even if an impact is applied to the image projection device 1 from the outside, the impact is absorbed by the fourth thermally conductive material 104, so that damage to the control board 6 can be prevented.

[0084] The first heat insulating member 105 is a member containing a material with low thermal conductivity, and is provided between the switch board 10 and the control board 6 in the z direction. By providing the first heat insulating member 105, heat transfer from the control board 6 to the switch board 10 is suppressed, and damage to components such as semiconductors included in the switch board 10 due to heat is prevented.

[0085] In order to more efficiently suppress heat transfer from the control board 6 to the switch board 10, it is preferable that the first insulating member 105 is arranged so that at least a portion of the first insulating member 105 overlaps a heat source such as a semiconductor mounted on the control board 6 when the control board placement surface 86b is viewed in a plan view.

[0086] The first heat insulating member 105 may be made of a rubber material, a resin material, or the like, which has low thermal conductivity. If the first heat insulating member 105 is required to have rigidity, a metal material such as aluminum, which has a lower thermal conductivity than the fourth heat conductive material 104, may be used. The first heat insulating member 105 may be formed by attaching an insulator such as insulating tape to the surface of a member made of a metal material. If it is permissible to increase the distance between the switch board 10 and the control board 6, the first heat insulating member 105 may be formed of an air layer.

[0087] The second heat insulating member 106 is a member containing a material with low thermal conductivity, and is provided so as to be in contact with both the battery 7 and the support member 8. By providing the second heat insulating member 106, even when the battery 7 is provided in contact with the support member 8, the heat of the projection unit 3 and the control board 6 on the support member 8 is suppressed from being transferred to the battery 7 via the support member 8, thereby preventing damage to the battery 7.

[0088] The material of the second heat insulating member 106 is the same as the material of the first heat insulating member 105. In addition, when it is permissible to increase the distance between the support member 8 and the battery 7, the second heat insulating member 106 can be formed of an air layer.

[0089] Here, the configuration around the fourth thermally conductive material 104 can be appropriately changed. For example, as shown in Fig. 26, when one surface of the fourth thermally conductive material 104a on the negative z-direction side is brought into contact with the control board 6 and the other surface on the positive z-direction side is brought into contact with the upper cover 21, the thickness in the z-direction is reduced.

[0090] Also, as shown in Fig. 27, a fourth thermally conductive material 104b having a concave shape may be used. In the case where the switch board 10 has heat resistance that can tolerate heat generated by the control board 6, as shown in Fig. 28, the first heat insulating member 105 may not be provided and the fourth thermally conductive material 104 may be in direct contact with the switch board 10.

[0091] <Effects of image projection device 1> As described above, the image projection device 1 according to this embodiment includes the projection unit 3 that projects an image, the support member 8 that supports the projection unit 3, and the upper cover 21 and the lower cover 22 (exterior members) that cover the projection unit 3 and the support member 8. The image projection device 1 also includes a first thermally conductive material 101 provided between the projection unit 3 and the support member 8, and a second thermally conductive material 102 provided between the support member 8 and the lower cover 22. The projection unit 3 also includes a display device 32 (image generation unit) that generates an image, the projection unit 3 is disposed on the projection unit arrangement surface 86a, and the first thermally conductive material 101 is disposed so that at least a part of the first thermally conductive material 101 overlaps with the display device 32 when the projection unit arrangement surface 86a is viewed in plan. With this configuration, the first thermally conductive material 101 and the display device 32 can be disposed closer to each other, and therefore an image projection device that can efficiently dissipate heat generated from inside the image projection device through the first thermally conductive material 101 can be provided. Moreover, the heat generated by the display device 32 can be transferred to the first thermally conductive material 101 side, and the heat generated by the image projection device 1 can be prevented from being dissipated to places other than desired places in the image projection device 1.

[0092] In this embodiment, the first thermally conductive material 101 is in contact with the projection unit 3, but this is not necessarily required. For example, the same effect can be obtained when another member is interposed between the first thermally conductive material 101 and the projection unit 3. However, from the viewpoint of suppressing heat transfer through the other member interposed between the first thermally conductive material 101 and the projection unit 3, it is preferable that the thermal conductivity of the first thermally conductive material 101 is higher than the thermal conductivity of the other member.

[0093] In this embodiment, the second thermally conductive material 102 is provided so that at least a part of the second thermally conductive material 102 overlaps with the first thermally conductive material 101 when the projection unit arrangement surface 86a is viewed in plan. With this configuration, the first thermally conductive material 101 and the display device 32 can be arranged closer to each other, and the second thermally conductive material 102 and the first thermally conductive material 101 can be arranged closer to each other. As a result, an image projection device capable of efficiently dissipating heat generated from inside the image projection device through the first thermally conductive material 101 and the second thermally conductive material 102 can be provided. In addition, heat generated by the display device 32 and transferred to the first thermally conductive material 101 can be transferred to the second thermally conductive material 102 side, and the heat generated by the image projection device 1 can be prevented from being dissipated to a location other than a desired location in the image projection device 1.

[0094] In this embodiment, the third thermally conductive material 103 is provided between the support member 8 and the second thermally conductive material 102, and the third thermally conductive material 103 is provided so that at least a part of the third thermally conductive material 103 overlaps with each of the first thermally conductive material 101 and the second thermally conductive material 102 when the projection unit arrangement surface 86a is viewed in plan. With this configuration, the third thermally conductive material 103 and the first thermally conductive material 101 can be arranged closer to each other, and the third thermally conductive material 103 and the second thermally conductive material 102 can be arranged closer to each other. As a result, an image projection device capable of efficiently dissipating heat generated from inside the image projection device through the first thermally conductive material 101, the second thermally conductive material 102, and the third thermally conductive material 103 can be provided. In addition, the heat generated by the display device 32 and transmitted to the first thermal conductive material 101 can be transmitted to the second thermal conductive material 102 side via the third thermal conductive material 103, thereby preventing the heat generated by the image projection device 1 from being dissipated to locations other than the desired locations in the image projection device 1.

[0095] In the present embodiment, the second thermally conductive material 102 is in contact with the third thermally conductive material 103, but they do not necessarily need to be in contact. For example, the same effect can be obtained when another member is interposed between the second thermally conductive material 102 and the third thermally conductive material 103. However, from the viewpoint of suppressing heat transfer through the other member interposed between the second thermally conductive material 102 and the third thermally conductive material 103, it is preferable that the thermal conductivity of each of the second thermally conductive material 102 and the third thermally conductive material 103 is higher than the thermal conductivity of the other member.

[0096] Furthermore, the projection unit 3 has a light-emitting unit 31, and the first thermally conductive material 101 may be provided such that at least a portion of the first thermally conductive material 101 overlaps with the light-emitting unit 31 when the projection unit arrangement surface 86a is viewed in plan. With this configuration, the first thermally conductive material 101 and the light-emitting unit 31 can be arranged closer to each other, and an image projection device capable of efficiently dissipating heat generated from inside the image projection device through the first thermally conductive material 101 can be provided. Furthermore, heat generated by the light-emitting unit 31 can be transferred to the first thermally conductive material 101 side, and dissipation of heat generated by the image projection device 1 to a location other than a desired location in the image projection device 1 can be suppressed.

[0097] Furthermore, in this embodiment, the image projection device 1 has a control unit 60 that controls the operation of the projection unit 3, a control board 6 (control member) on which the control unit 60 is provided, and a fourth thermally conductive material 104 provided between the control board 6 and the upper cover 21. The fourth thermally conductive material 104 is in contact with each of the control board 6 and the upper cover 21. With this configuration, heat generated by the control board 6 is transferred to the upper cover 21 through the fourth thermally conductive material 104, and dissipated to the outside of the image projection device 1 through the upper cover 21, thereby preventing damage to the image projection device 1 due to heat generated by the control board 6.

[0098] Furthermore, in this embodiment, the battery 7 is provided on the first surface 85 side of the support member 8, and the projection unit 3 and the control board 6 are provided on the second surface 86 side opposite the first surface 85. With this configuration, the battery can be placed in a different space from the projection unit 3 and the control board 6, which are prone to heat generation, with the support member 8 in between, thereby preventing damage to the battery 7 due to heat generation from the projection unit 3 or the control board 6.

[0099] In this embodiment, the image projection device 1 has an operation button group 9 (operation member), a switch board 10 (operation processing member) that outputs a signal corresponding to an operation input using the operation button group 9 to the control board 6, and a first heat insulating member 105 provided between the switch board 10 and the control board 6. The control board 6 is provided on a control board arrangement surface 86b of the support member 8, and the switch board 10 is provided such that at least a portion of the switch board 10 overlaps with the control board 6 when the control board arrangement surface 86b is viewed in plan. This configuration prevents heat from the control board 6 from being transmitted to the switch board 10, and prevents damage to the switch board 10 due to heat generation.

[0100] In this embodiment, the operation button group 9 and the switch board 10 are integrally attached to the upper cover 21. With this configuration, the operation button group 9 and the switch board 10 are integrated inside the upper cover 21, which improves the ease of maintenance when removing them.

[0101] Furthermore, in this embodiment, the image projection device 1 has a second heat insulating member 106 that is in contact with each of the battery 7 and the support member 8. This prevents heat from the projection unit 3 and the control board 6 from being transmitted to the battery 7 through the support member 8, and prevents damage to the battery 7.

[0102] In this embodiment, the image projection device 1 has a main body 2 that houses the projection unit 3 and the support member 8 in a space covered by the upper cover 21 and the lower cover 22, and the main body 2 includes a protruding portion 2D from which a part of the space covered by the upper cover 21 and the lower cover 22 protrudes. The protruding portion 2D includes an upper portion 2Du (first portion), a lower portion 2Dd (second portion) facing the upper portion 2Du, and a side portion 2Ds (third portion) intersecting with each of the upper portion 2Du and the lower portion 2Dd. The projection unit 3 is provided in the protruding portion 2D, and the second thermally conductive material 102 is provided so that at least a part of the second thermally conductive material 102 overlaps with the side portion 2Ds when the side portion 2Ds is viewed in a plan view. With this configuration, heat can be dissipated to the side portion 2Ds that the operator touches less frequently when using the image projection device 1, thereby reducing the discomfort of the operator.

[0103] In this embodiment, the configuration in which the heat generated by the projection unit 3 is actively transferred to each of the lower portion 2Dd, the side portion 2Ds, and the front portion 2Df is exemplified, but the present invention is not limited to this configuration. In addition, the arrangement of the first to fourth thermally conductive materials can be appropriately determined so that the heat is dissipated to a portion of the image projection device 1 that is unlikely to be touched by the skin of the operator or a portion that is unlikely to be affected by damage to the components of the image projection device 1.

[0104] [Second embodiment] Next, an image projection device 1a according to a second embodiment will be described. Note that the same components as those in the first embodiment are given the same reference numerals, and duplicated descriptions will be omitted as appropriate.

[0105] Fig. 32 is a block diagram showing an example of the configuration of the image projection device 1a. As shown in Fig. 32, the image projection device 1a includes a control unit 60a and a battery 7a. The control unit 60a includes a substrate temperature detection IC (Integrated Circuit) 401, a light emission control IC 402, a charge / discharge control IC 404, and an MCU (Micro Controller Unit) 18Aa.

[0106] The substrate temperature detection IC 401 is an example of a member temperature detection circuit that outputs temperature information of the control substrate 6. Specifically, the substrate temperature detection IC 401 detects the temperature of the control substrate 6 and outputs the temperature information of the control substrate 6 to the light emission control IC 402. The substrate temperature detection IC 401 also has a first temperature sensor 401a. The first temperature sensor 401a is an example of a member temperature detection circuit temperature output unit that outputs the temperature information of the substrate temperature detection IC 401. Note that the temperature detected by the substrate temperature detection IC 401 may include not only the temperature of the control substrate 6 but also the environmental temperature inside the image projection device 1a, so the substrate temperature detection IC 401 can also be said to detect the environmental temperature inside the image projection device 1a.

[0107] The light emission control IC 402 is an example of a light emission control circuit that controls light emission by the light emitting unit 31. The light emission control IC 402 also has a second temperature sensor 402a. The second temperature sensor 402a is an example of a light emission temperature output unit that outputs temperature information of the light emission control IC 402.

[0108] The greater the amount of light emitted by the light-emitting unit 31, the greater the amount of current flowing through the light-emitting control IC 402, and the temperature of the light-emitting control IC 402 rises according to the amount of current. Also, the greater the amount of light emitted by the light-emitting unit 31, the higher the temperature of the light-emitting unit 31 itself becomes, and the higher the temperature of the display device 32 that generates a projection image based on the incident light emitted by the light-emitting unit 31 becomes. For example, when the temperature of the light-emitting control IC 402 reaches a predetermined light-emitting temperature threshold Th1, the light-emitting control IC 402 outputs warning information indicating that the light-emitting temperature threshold Th1 has been reached.

[0109] In this embodiment, the second temperature sensor 402a is provided in the light emission control IC 402, but the present invention is not limited to this. For example, the second temperature sensor 402a may be provided in the light emission unit 31 and output temperature information of the light emission unit 31. In other words, the second temperature sensor 402a outputs temperature information of at least one of the light emission control IC 402 and the light emission unit 31, and the light emission control IC 402 can control the light emission by the light emission unit 31 based on the temperature information of at least one of the light emission control IC 402 and the light emission unit 31.

[0110] The battery 7a has a battery temperature sensor 403. The battery temperature sensor 403 is an example of a battery temperature output unit that outputs temperature information of the battery 7a. The battery temperature sensor 403 may be an NTC (Negative Temperature Coefficient Thermistor) thermistor that detects a temperature change in the battery 7a based on a change in electrical resistance value.

[0111] The charge / discharge control IC 404 is an example of a charge / discharge control circuit that controls charging and discharging of the battery 7a. Note that charging refers to supplying power to the battery 7a from a commercial power source or the like to accumulate (store) power in the battery 7a. Discharging refers to supplying the power accumulated in the battery 7a to the components of the image projection device 1a. Under the control of the charge / discharge control IC 404, the battery 7a is charged using a power supply cable such as a USB (Universal Serial Bus)-Type C cable and an AC adapter, and supplies the accumulated power to the components of the image projection device 1a.

[0112] The charge / discharge control IC 404 has a third temperature sensor 404a. The third temperature sensor 404a is an example of a charge / discharge control circuit temperature output unit that outputs temperature information of the charge / discharge control IC 404. For example, when the amount of current flowing through the charge / discharge control IC 404 increases in response to the amount of power supplied from the battery 7a to the components of the image projection device 1a, the temperature of the charge / discharge control IC 404 rises in response to the amount of current. The third temperature sensor 404a detects the temperature of the charge / discharge control IC 404 and outputs it as temperature information of the charge / discharge control IC 404.

[0113] The charge / discharge control IC 404 controls discharging by the battery 7a based on temperature information of the charge / discharge control IC 404. For example, the charge / discharge control IC 404 determines whether or not to discharge the battery 7a based on the temperature information of the charge / discharge control IC 404, and stops discharging from the battery 7a when the temperature of the battery 7a is high and there is a concern that electronic components in the image projection device 1a may be damaged. Alternatively, the charge / discharge control IC 404 stops charging the battery 7a when the temperature of the charge / discharge control IC 404 is below zero.

[0114] 33 is a block diagram showing an example of a functional configuration of the MCU 18Aa. As shown in FIG. 33, the MCU 18Aa includes a cutoff control unit 181, a restriction control unit 182, a switching control unit 183, and a monitoring unit 184.

[0115] The cutoff control unit 181 detects the temperature T O , the temperature T of the control board 6 M , or the temperature T of the battery 7a M Based on at least one of the following, the control signal S C By outputting this signal, the power supply from the battery 7a is controlled to be cut off.

[0116] Specifically, when power is being supplied to the image projection device 1a, the substrate temperature detection IC 401 detects the temperature T M The battery temperature sensor 403 detects the temperature T B The second temperature sensor 402a measures the temperature T O The shutdown control unit 181 outputs the information on the temperature T M When the temperature T of the battery 7a reaches the first board threshold temperature Tm1, B When the battery temperature threshold Tb1 is reached, or when the temperature T O When the light emission temperature reaches the light emission temperature threshold Th1 and the light emission control IC 402 issues a warning, the overheat protection function is executed and the power supply from the battery 7a is cut off.

[0117] The limiting control unit 182 determines the temperature T O or the temperature T of the charge / discharge control IC 404 C Based on the temperature information of either one of the control signals S R By outputting the signal, the power supply from the battery 7a is controlled to be partially limited. The state in which the power supply from the battery 7a is partially limited is, for example, a standby state. The standby state refers to a state in which the power supply to the projection unit 3 and the like is stopped to reduce power consumption while maintaining the state of the memory during operation.

[0118] The switching control unit 183 outputs a control signal S to the projection unit 3 based on an operation input signal Sw of the switching unit 18. L by outputting a signal "ON" to switch between projection ON and projection OFF. Projection ON refers to a state in which an image is being projected, and projection OFF refers to a state in which an image is not being projected by the projection unit 3. Furthermore, during a period in which the switching unit 18 is ON in the momentary mode, the switching control unit 183 supplies power to the projection unit 3 through the wiring 14 to turn on the projection. Note that the momentary mode refers to a mode in which the projection is ON only while the button is being pressed.

[0119] The monitoring unit 184 has a so-called watchdog timer function for monitoring whether the MCU 18Aa is operating normally, and if the MCU 18Aa is not operating normally, resets the control unit 60a after a predetermined reset time S2 has elapsed. The reset puts the image projection device 1a into a standby state. When the power button 11 is pressed by the operator in the standby state, the monitoring unit 184 restarts the control unit 60a.

[0120] <Operation Example of Image Projection Device 1a> (Example of control using the charge / discharge control IC404) Fig. 34 is a diagram for explaining an example of current control by the charge / discharge control IC 404. The horizontal axis of Fig. 34 indicates the discharge time of the battery 7a, and the vertical axis indicates the temperature of the battery 7a.

[0121] When the temperature of the battery 7a is equal to or lower than the first battery temperature threshold Tk1, the charge / discharge control IC 404 discharges the battery 7a so that the amount of current flowing from the battery 7a to the components of the image projection device 1a (hereinafter, component current amount) becomes a predetermined first current amount Fk1. When the temperature of the battery 7a reaches the first battery temperature threshold Tk1, the charge / discharge control IC 404 discharges the battery 7a so that the component current amount becomes a predetermined second current amount Fk2.

[0122] When the temperature of the battery 7a exceeds the first battery temperature threshold Tk1 and reaches the second battery temperature threshold Tk2, the charge / discharge control IC 404 stops discharging the battery 7a. When the temperature of the battery 7a exceeds the second battery temperature threshold Tk2, the charge / discharge control IC 404 sets the component current value to a predetermined third current amount Fk3 (for example, the current amount is 0 [A]) until the temperature of the battery 7a falls to the third battery temperature threshold Tk3.

[0123] Thereafter, when the temperature of the battery 7a drops to the third battery temperature threshold Tk3, the charge / discharge control IC 404 causes the battery 7a to discharge so that the component current amount becomes the first current amount Fk1 or another predetermined current amount. However, when the temperature of the charge / discharge control IC 404 is 0° C. or lower, the charge / discharge control IC 404 stops discharging the battery 7a.

[0124] (Example of temperature control using MCU18Aa) 35 is a diagram illustrating an example of temperature control by the MCU 18Aa. When the light-emitting unit 31 in the projection unit 3 is emitting light, the temperature T M 35 shows the control performed by the MCU 18Aa when the second substrate threshold temperature Tm2 is reached. The horizontal axis of Fig. 35 shows the light emission time of the light-emitting unit 31, and the vertical axis shows the amount of current flowing through the light-emitting unit 31 (hereinafter referred to as the light-emitting unit current amount). Note that the light-emitting unit current amount is shown as a percentage [%] of the initial current amount flowing through the light-emitting unit 31 when the image projection device 1a projects an image in the initial state, which is set to 100 [%].

[0125] temperature T MWhen the temperature T reaches the second substrate threshold temperature Tm2, ​​the light emission control IC 402 reduces the amount of light emitted by the light emission unit 31 by reducing the amount of light emission unit current by a predetermined reduction current amount W1. M When the temperature T reaches the second substrate threshold temperature Tm2 multiple times, the light emission control IC 402 M Each time the second substrate threshold temperature Tm2 is reached, the light-emitting unit current is reduced by the reduction current amount W1. This temporarily reduces the temperature inside the image projection device 1a, thereby preventing the power supply to the image projection device 1a from being cut off due to a rise in temperature, and allows the image to be projected continuously. The reduction current amount W1 is, for example, 10[%].

[0126] After reducing the amount of current in the light-emitting unit by the reduction current amount W1, the light-emitting control IC 402 reduces the temperature T M has not reached the second substrate threshold temperature Tm2, ​​the light-emission control IC 402 waits for a time equal to or longer than a predetermined wait time S3 as a condition for the next reduction in the current reduction amount W1. In other words, the light-emission control IC 402 controls the light-emission amount of the light-emitting unit 31 not to change until the wait time S3 has elapsed after changing the amount of light by the light-emitting unit 31 by reducing the light-emitting unit current amount by the reduce current amount W1. If the wait time S3 has not elapsed after reducing the current reduction amount W1, the light-emission control IC 402 does not perform control to next reduce the current reduction amount W1, and continues temperature monitoring.

[0127] Here, if the control to reduce the amount of current to the light-emitting unit is repeatedly performed, and the amount of current to the light-emitting unit is reduced too much, the amount of light emitted by the light-emitting unit 31 will fall below a predetermined lower limit light amount, causing the brightness of the projected image to be insufficient, raising a concern that the visibility of the projected image will be reduced.

[0128] In this embodiment, a lower limit current amount W2 corresponding to the lower limit of the brightness of the projected image is determined in advance, and when the light-emitting unit current amount becomes equal to or less than the lower limit current amount W2, the reduction control by the reduced current amount W1 is not performed. In other words, the light-emitting control IC 402 controls the amount of light emitted by the light-emitting unit 31 to be maintained at or above the lower limit light amount. The lower limit current amount W2 is, for example, 40[%]. The lower limit light amount is an example of a predetermined light amount.

[0129] If the image projection continues after the lower limit current amount W2 corresponding to the lower limit light amount is reached, the temperature inside the image projection device 1a may further increase. M When the temperature T of the battery 7a reaches the first board threshold temperature Tm1, B When the battery temperature threshold Tb1 is reached, or when the temperature T O When the light emission temperature reaches the light emission temperature threshold Th1 and the light emission control IC 402 issues a warning, as described above, the cutoff control unit 181 executes the overheat protection function and cuts off the power supply from the battery 7a.

[0130] Furthermore, if the temperature control function by the MCU 18Aa becomes ineffective due to a malfunction or the like, the temperature of the control board 6 may rise, and there is a concern that electronic components mounted on the control board 6 may be damaged. To prevent this, when a predetermined protection temperature is reached, the limiting control unit 182 limits the temperature T O , or the temperature T C Based on the temperature information of either one of the control signals S R By outputting the signal, the power supply from the battery 7a is controlled to be partially limited.

[0131] Temperature T of the light emission control IC402 O When the temperature T of the battery 7a reaches the light emission temperature threshold Th1, the light emission control IC 402 forcibly turns off the light emitting unit 31 by the overheat protection device provided therein. B When the unit reaches a certain temperature, the automatic overheat protection circuit switches the unit to standby mode.

[0132] Fig. 36 is a flowchart showing an example of the temperature control process by the MCU 18Aa. Fig. 35 shows the process starting from the time when the MCU 18Aa starts the temperature control after the power supply from the battery 7a to the components of the image projection device 1a is started in response to an operation input to the power button 11 of the image projection device 1a.

[0133] First, in step S351, the MCU 18Aa detects the temperature T M , the temperature T of the battery 7a B and the temperature T of the light emission control IC 402 O Each piece of information is obtained.

[0134] Next, in step S352, the MCU 18Aa detects the temperature T M is smaller than the first substrate threshold temperature Tm1. If it is determined in step S352 that it is not smaller (No in step S352), the MCU 18Aa moves the process to step S361, and the cutoff control unit 181 cuts off the power supply from the battery 7a to the components of the image projection device 1a. On the other hand, the temperature T M If it is determined that the first substrate threshold temperature Tm1 is lower than the first substrate threshold temperature Tm1 (Yes at step S352), the MCU 18Aa shifts the process to step S353.

[0135] Next, in step S353, the MCU 18Aa detects the temperature T B If it is determined in step S353 that the temperature T of the battery 7a is not smaller than the battery temperature threshold Tb1 (No in step S353), the cutoff control unit 181 performs the process of step S361 described above. B If it is determined that the battery temperature threshold Tb1 is smaller than the battery temperature threshold Tb1 (Yes at step S353), the MCU 18Aa shifts the process to step S354.

[0136] Next, in step S354, the MCU 18Aa detects the temperature T O If it is determined in step S354 that the temperature T is not smaller than the light emission temperature threshold value Th1 (step S354, No), the light emission control IC 402 issues a warning, and then the cutoff control unit 181 performs the process of step S361 described above. O If it is determined that the light emission temperature threshold value Th1 is smaller than the light emission temperature threshold value Th1 (Yes at step S354), the MCU 18Aa shifts the process to step S355.

[0137] The order of the processes in steps S352 to S354 may be changed as appropriate, or each process may be performed in parallel.

[0138] Next, in step S355, the MCU 18Aa detects the temperature T M is smaller than the second substrate threshold temperature Tm2. If it is determined in step S355 that it is not smaller (step S355, No), the MCU 18Aa shifts the process to step S351. On the other hand, if it is determined that it is smaller (step S355, Yes), the MCU 18Aa shifts the process to step S356.

[0139] Next, in step S356, the MCU 18Aa obtains information on the number of times the light-emitting unit current amount has been reduced by the reduction current amount W1 using the light-emitting control IC 402, and determines whether the number of times is greater than 0. For example, the MCU 18Aa can obtain the number of times information by storing, in a RAM or the like, information on the number of times the counter has been incremented each time the light-emitting unit current amount has been reduced by the reduction current amount W1 using the light-emitting control IC 402, and reading the information from the RAM or the like.

[0140] If it is determined in step S356 that the number of times is not greater than 0 (step S356, No), the MCU 18Aa shifts the process to step S358. On the other hand, if it is determined that the number of times is greater than 0 (step S356, Yes), the MCU 18Aa shifts the process to step S357.

[0141] Next, in step S357, the MCU 18Aa obtains information about the elapsed time from the time when the light-emitting control IC 402 previously reduced the amount of light-emitting unit current by the reduction current amount W1, and determines whether the elapsed time is equal to or longer than the standby time S3. For example, the MCU 18Aa can obtain the elapsed time information by counting the CPU clock from the time when the light-emitting control IC 402 reduced the amount of light-emitting unit current by the reduction current amount W1.

[0142] If it is determined in step S357 that the elapsed time is not equal to or greater than the waiting time S3 (step S357, No), the MCU 18Aa shifts the process to step S351. On the other hand, if it is determined that the elapsed time is equal to or greater than the waiting time S3 (step S357, Yes), the MCU 18Aa shifts the process to step S358.

[0143] The order of the processes in steps S355 to S357 may be changed as appropriate, or each process may be executed in parallel.

[0144] Next, in step S358, the MCU 18Aa determines whether the light-emitting unit current amount is greater than the lower limit current amount W2. If it is determined in step S358 that the light-emitting unit current amount is not greater (step S358, No), the MCU 18Aa shifts the process to step S351. On the other hand, if it is determined that the light-emitting unit current amount is greater (step S358, Yes), the MCU 18Aa reduces the light-emitting unit current amount by the reduction current amount W1 in step S359.

[0145] Next, in step S360, the MCU 18Aa determines whether or not to end the process. For example, the MCU 18Aa can determine whether or not to end the process based on an operation input by an operator to the image projection device 1a.

[0146] If it is determined in step S360 that the processing should be terminated (Yes in step S360), the MCU 18Aa terminates the processing; if it is determined that the processing should not be terminated (No in step S360), the MCU 18Aa transitions to step S351 and performs the processing from step S351 onwards again.

[0147] In this manner, the MCU 18Aa can perform temperature control.

[0148] <Functions and Effects of Image Projection Device 1a> As described above, this embodiment includes the control unit 60a that controls the operation of the projection unit 3, the control board 6 on which the control unit 60a is provided, and a board temperature detection IC 401 (component temperature detection circuit) that outputs temperature information of the control board 6. The control unit 60a controls the amount of light emitted by the light-emitting unit 31 based on the temperature information of the control board 6. By changing the amount of light from the light-emitting unit 31, heat generation by the control board 6 can be suppressed, and damage to components inside the image projection device 1a due to the heat generation can be prevented.

[0149] In this embodiment, the control unit 60a controls the amount of light emitted by the light-emitting unit 31 so that the amount of light does not change until the standby time S3 has elapsed after changing the amount of light emitted by the light-emitting unit 31. This prevents the projected image from suddenly becoming dark, reducing discomfort to the operator.

[0150] In this embodiment, the image projection device 1a has a first temperature sensor (a component temperature detection circuit temperature output unit) that outputs temperature information of the substrate temperature detection IC 401. This makes it possible to manage the temperature of the substrate temperature detection IC 401 and to take measures in the case where the substrate temperature detection IC 401 becomes too hot.

[0151] Furthermore, in this embodiment, the image projection device 1a has an emission control IC 402 (emission control circuit) that controls the emission of light by the light-emitting unit 31, and a second temperature sensor 402a (emission temperature output unit) that outputs temperature information of at least one of the emission control IC 402 and the light-emitting unit 31. The emission control IC 402 reduces the amount of light emitted by the light-emitting unit 31 based on the temperature information of at least one of the emission control IC 402 and the light-emitting unit 31. This makes it possible to suppress the amount of heat generated by the control board 6, and to prevent damage to components inside the image projection device 1a due to heat.

[0152] In this embodiment, the light emission control IC 402 controls the amount of light emitted by the light emitting unit 31 so as to maintain the amount of light equal to or greater than a predetermined amount. This makes it possible to avoid a situation in which the amount of current in the light emitting unit is reduced too much, causing a projected image to become insufficient in brightness and thus reducing visibility of the projected image.

[0153] In this embodiment, the image projection device 1a includes a battery 7a, a charge / discharge control IC 404 (charge / discharge control circuit) that controls charging and discharging of the battery 7a, and a third temperature sensor 404a (charge / discharge control circuit temperature output unit) that outputs temperature information of the charge / discharge control IC 404. This allows the temperature of the battery 7a to be managed based on the temperature of the charge / discharge control IC 404, and the life of the battery 7a can be extended by suppressing a temperature rise of the battery 7a.

[0154] In this embodiment, the charge / discharge control IC 404 stops discharging the battery 7a based on the temperature information of the charge / discharge control IC 404. This makes it possible to prevent a further temperature rise in the battery 7a or to prevent damage to components of the image projection device 1a due to high heat when the temperature inside the image projection device 1 rises abnormally or when an abnormality occurs in the battery 7a.

[0155] In this embodiment, the image projection device 1a has a battery temperature sensor 403 (battery temperature output unit) that outputs temperature information of the battery 7a. This makes it possible to manage the temperature of the battery 7a and take measures if an abnormality occurs.

[0156] In this embodiment, the cutoff control unit 181 controls the power supply from the battery 7a to be cut off based on temperature information of at least one of the light emission control IC 402, the control board 6, and the battery 7a. For example, when the temperature inside the image projection device 1a is rising, even if any of the second temperature sensor 402a, the board temperature detection IC 401, or the battery temperature sensor 403 is damaged, the cutoff control unit 181 detects the temperature rise inside the image projection device 1a and stops the image projection device 1a. This makes it possible to prevent the damage to the image projection device 1a from spreading.

[0157] In this embodiment, when the temperature of the charge / discharge control IC 404 is equal to or higher than the battery temperature threshold Tb1, the charge / discharge control IC 404 stops discharging the battery 7a. This makes it possible to suppress a rise in the temperature of the battery 7a and extend the life of the battery 7a.

[0158] In this embodiment, the charge / discharge control IC 404 stops charging the battery 7a when the temperature of the charge / discharge control IC 404 is below zero, thereby preventing the battery 7a from being damaged due to charging in a low-temperature environment.

[0159] In this embodiment, the limitation control unit 182 controls so as to limit a part of the power supply from the battery 7a based on the temperature information of either the light emission control IC 402 or the charge / discharge control IC 404. This makes it possible to suppress a temperature rise in the image projection device 1a and prevent the spread of damage to the image projection device 1a.

[0160] Other effects of this embodiment than those described above are the same as those described in embodiment 1. This embodiment and embodiment 1 can also be combined.

[0161] The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Any design modifications made by a person skilled in the art to these specific examples are also included within the scope of the present disclosure as long as they have the features of the present disclosure. The elements of each of the above-mentioned specific examples and their arrangements, conditions, shapes, etc. are not limited to those exemplified and can be changed as appropriate. The combination of each of the elements of each of the above-mentioned specific examples can be changed as appropriate as long as no technical contradiction occurs.

[0162] In the embodiment, a handy and small image projection device is exemplified, but the present invention is not limited to this, and the embodiment can be applied to various types of image projection devices such as a vertical type, a horizontal type, a ceiling type, etc. The image projection device can also be called an image projection device. [Explanation of symbols]

[0163] 1 Image projection device 2 Main unit 2D convex part 2Du Upper part (example of the first part) 2Dd Lower part (an example of the second part) 2Ds Side part (an example of the third part) 2Df Front (example of the third part) 21 Upper cover (an example of an exterior component) 22 Lower cover (an example of an exterior component) 3 Projection section 31 Light emitting part 32 Display device (an example of an image generating unit) 4 Projection button 6 Control board (an example of a control member) 60, 60a Control section 7, 7a battery 8 Support member 85 First Side 86 Second Side 86a Projection unit placement surface 86b Control panel arrangement surface 9 Operation buttons (an example of an operation member) 10 Switch board (an example of an operation processing member) 11 Power button 12 Buttons 13 Connectors 14 Wiring 15 Dial 16 Indicators 18 Switching section 18Aa MCU 101 First thermal conductive material 102 Second thermal conductive material 103 Third thermal conductive material 104 4th thermal conductive material 105 First heat insulating member 106 Second insulation member 181 Shutdown control section 182 Restriction control section 183 Switching control section 184 Monitoring Department 401 Board temperature detection IC (an example of a component temperature detection circuit) 401a First temperature sensor (an example of a temperature output unit of a component temperature detection circuit) 402 Light Emitting Control IC (An example of a light emitting control circuit) 402a Second temperature sensor (an example of a light emission temperature output unit) 403 Battery temperature sensor (an example of a battery temperature output section) 404 Charge / discharge control IC (an example of a charge / discharge control circuit) 404a Third temperature sensor (an example of a charge / discharge control circuit temperature output section) L light L1 optical axis T O , T M , T B , T C temperature Sw Operation input signal S C , S R , S L Control Signals W1 Reduced current amount W2 Lower limit current amount Tm1 First substrate threshold temperature Tm2 Second substrate threshold temperature Tk1 First battery temperature threshold Tk2 Second battery temperature threshold S3 Wait Time [Prior art documents] [Patent documents]

[0164] [Patent Document 1] Registered Utility Model No. 3185491

Claims

1. A projection unit that projects an image; A support member that supports the projection unit; an exterior member that covers the projection unit and the support member; A first thermally conductive material provided between the projection portion and the support member; a second thermal conductive material provided between the support member and the exterior member, The projection unit has an image generation unit that generates the image, the projection unit is disposed on a projection unit arrangement surface of the support member, An image projection device, characterized in that the first thermally conductive material is arranged so that at least a portion of the first thermally conductive material overlaps the image generation unit when the projection unit placement surface is viewed in a planar view.

2. The image projection device according to claim 1 , characterized in that the second thermally conductive material is arranged so that at least a portion of the second thermally conductive material overlaps with the first thermally conductive material when the projection unit placement surface is viewed in a planar view.

3. a third thermal conductive material provided between the support member and the second thermal conductive material; The image projection device according to claim 1 or 2, characterized in that, when the projection unit placement surface is viewed in a plane, at least a portion of the third thermally conductive material overlaps with each of the first thermally conductive material and the second thermally conductive material.

4. The projection unit has a light emitting unit, The image projection device according to any one of claims 1 to 3, characterized in that the first thermally conductive material is arranged so that at least a portion of the first thermally conductive material overlaps with the light-emitting unit when the projection unit placement surface is viewed in a planar view.

5. A control unit that controls an operation of the projection unit; A control member provided with the control unit; a fourth thermal conductive material provided between the control member and the exterior member, 5. The image projection device according to claim 1, wherein the fourth thermally conductive material is in contact with both the control member and the exterior member.

6. A battery is included. the battery is provided on a first surface side of the support member, 6. The image projection device according to claim 5, wherein the projection unit and the control member are provided on a second surface side opposite to the first surface.

7. An operating member; an operation processing member that outputs a signal corresponding to an operation input using the operation member to the control unit; A first heat insulating member is provided between the operation processing member and the control member, the control member is disposed on a control plate arrangement surface of the support member, 7. The image projection device according to claim 5, wherein the operation processing member is provided so that at least a part of the operation processing member overlaps with the control member when the control plate arrangement surface is viewed in a plan view.

8. The image projection device according to claim 7 , wherein the operation member and the operation processing member are integrally attached to the exterior member.

9. A battery; 9. The image projection device according to claim 7, further comprising: a second heat insulating member in contact with each of the battery and the support member.

10. a main body including the exterior member and housing the projection unit and the support member in a space covered by the exterior member; the main body includes a protrusion that protrudes from a portion of a space covered by the exterior member, the protrusion includes a first portion, a second portion facing the first portion, and a third portion intersecting the first portion and the second portion, The projection portion is provided within the protrusion, The image projection device according to any one of claims 1 to 9, characterized in that the second thermally conductive material is arranged so that at least a portion of the second thermally conductive material overlaps the third portion when viewed in a plane.

11. 11. The image projection device according to claim 1, wherein the first thermally conductive material includes a graphite sheet.

12. 11. The image projection device according to claim 1, wherein the first thermally conductive material includes an elastic body.

13. 13. The image projection device according to claim 1, wherein the first thermally conductive material has adhesiveness.

14. 14. The image projection device according to claim 1, wherein the first thermally conductive material has a thermal conductivity of 1.5 [W / m·k] or more.

15. 15. The image projection device according to claim 1, wherein the second thermally conductive material includes copper foil.

16. 16. The image projection device according to claim 1, wherein the accessible surface of the exterior member is at least one of a matte surface and a textured surface.

17. A control unit that controls an operation of the projection unit; A control member provided with the control unit; a member temperature detection circuit that outputs temperature information of the control member; The projection unit has a light emitting unit, 17. The image projection device according to claim 1, wherein the control unit controls the amount of light emitted by the light emitting unit based on temperature information of the control member.

18. 18. The image projection device according to claim 17, wherein the control unit controls the amount of light emitted by the light emitting unit so that the amount of light does not change until a predetermined waiting time has elapsed after changing the amount of light emitted by the light emitting unit.

19. 19. The image projection device according to claim 17, further comprising a member temperature detection circuit temperature output section that outputs temperature information of the member temperature detection circuit.

20. a light emission control circuit for controlling light emission by the light emitting unit; a light emission temperature output unit that outputs temperature information of at least one of the light emission control circuit and the light emission unit, 20. The image projection device according to claim 17, wherein the light emission control circuit controls light emission by the light emitting unit based on temperature information of at least one of the light emission control circuit and the light emitting unit.

21. The image projection device according to claim 20 , wherein the light emission control circuit controls the amount of light emitted by the light emitting unit so as to maintain the amount of light at or above a predetermined amount.

22. A battery; a charge / discharge control circuit for controlling charging and discharging of the battery; 22. The image projection device according to claim 20, further comprising a charge / discharge control circuit temperature output unit that outputs temperature information of the charge / discharge control circuit.

23. 23. The image projection device according to claim 22, wherein the charge / discharge control circuit stops the discharge based on temperature information of the charge / discharge control circuit.

24. 24. The image projection device according to claim 22, further comprising a battery temperature output unit that outputs temperature information of the battery.

25. 25. The image projection device according to claim 22, further comprising a cut-off control unit that controls the power supply from the battery to be cut off based on temperature information of at least one of the light emission control circuit, the control member, or the battery.

26. 26. The image projection device according to claim 22, wherein the charge / discharge control circuit stops the discharging by the battery when the temperature of the charge / discharge control circuit is equal to or higher than a predetermined battery temperature threshold value.

27. 27. The image projection device according to claim 22, wherein the charge / discharge control circuit stops the charging by the battery when the temperature of the charge / discharge control circuit is below zero.

28. 28. The image projection device according to claim 22, further comprising a limitation control unit that controls so as to limit a portion of the power supply from the battery based on temperature information of either the light emission control circuit or the charge / discharge control circuit.

Images