Light source device and cooling method

Abstract

The invention provides a light source device and a cooling method. The light source device (6) is provided with a first light-emitting element (611), a second light-emitting element (612), and a heat sink (8) that dissipates heat from the first light-emitting element (611) and the second light-emitting element (612). The heat sink (8) is provided with: a first heat dissipation section (821) that is disposed in a fluid flow path (PT) and that dissipates heat of the first light-emitting element (611) and the second light-emitting element (612) to the fluid; and a second heat dissipation part (822) that is disposed in the flow path (PT) and dissipates heat of the second light-emitting element (612) to the fluid. The allowable thermal resistance of the heat sink of the first light-emitting element (611), which is calculated from the difference between the maximum junction temperature and the ambient temperature and the heat generation amount, is greater than the allowable thermal resistance of the heat sink of the second light-emitting element (612), which is calculated from the difference between the maximum junction temperature and the ambient temperature and the heat generation amount.

Description

Technical Field

[0001] The invention relates to a light source device. Background Art

[0002] Conventionally, there is known a light source device including a plurality of light emitting elements (see, for example, Patent Document 1).

[0003] In the light source device described in Patent Document 1, in order to collectively cool a plurality of light emitting elements, the plurality of light emitting elements are thermally connected to the same heat sink (cooling unit).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2008-158191 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, when a plurality of light emitting elements use a common heat sink as in the light source device described in Patent Document 1, the following problem may occur.

[0009] For example, when the heat of a light-emitting element with a large heat generation cannot be sufficiently dissipated, the temperature of the light-emitting element adjacent to the light-emitting element may rise in conjunction with the light-emitting element. As a result, the adjacent light-emitting element cannot maintain an appropriate temperature, and the luminous efficiency of the adjacent light-emitting element may decrease.

[0010] Therefore, a technology is desired that can efficiently dissipate heat from a plurality of light emitting elements while using a common heat dissipation portion.

[0011] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a light source device capable of efficiently dissipating heat of a plurality of light emitting elements while using a common heat dissipation portion.

[0012] Solutions for solving problems

[0013] In order to solve the above-mentioned problems and achieve the purpose, the light source device of the present invention includes: a first light-emitting element; a second light-emitting element; and a heat sink, which dissipates heat from the first light-emitting element and the second light-emitting element, the heat sink including: a first heat dissipation portion, which is arranged on a flow path of a fluid and dissipates the heat of the first light-emitting element and the second light-emitting element to the fluid; and a second heat dissipation portion, which is arranged on the flow path and dissipates the heat of the second light-emitting element to the fluid, the allowable thermal resistance of the heat sink of the first light-emitting element calculated based on the difference between the maximum junction temperature and the ambient temperature and the heat generated is greater than the allowable thermal resistance of the heat sink of the second light-emitting element calculated based on the difference between the maximum junction temperature and the ambient temperature and the heat generated.

[0014] Effects of the Invention

[0015] According to the light source device of the present invention, the heat of the plurality of light emitting elements can be efficiently dissipated while the plurality of light emitting elements use a common heat dissipation portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing the configuration of an endoscope system according to Embodiment 1.

[0017] Figure 2 It is a diagram showing the internal structure of the light source device.

[0018] Figure 3 It is a diagram for explaining the structure of the cooling unit.

[0019] Figure 4 It is a diagram for explaining the structure of the cooling unit.

[0020] Figure 5 This is a diagram for explaining Modification 1-1 of Embodiment 1.

[0021] Figure 6 This is a diagram for explaining Modification 1-1 of Embodiment 1.

[0022] Figure 7 This is a diagram for explaining the structure of the cooling unit according to the second embodiment.

[0023] Figure 8 This is a diagram for explaining the structure of the cooling unit according to the second embodiment.

[0024] Fig. 9 This is a diagram for explaining the structure of the cooling unit according to the second embodiment.

[0025] Fig.10 This is a diagram for explaining Modification 2-1 of Embodiment 2.

[0026] Fig.11 This is a diagram for explaining Modification 2-1 of Embodiment 2.

[0027] Fig.12 This is a diagram for explaining Modification 2-2 of Embodiment 2.

[0028] Fig.13 This is a diagram for explaining Modification 2-3 of Embodiment 2.

[0029] Fig.14 It is a figure explaining Embodiment 1, 2, and Modification 3-1 of Modifications 1-1, 2-1 to 2-3.

[0030] Fig.15 It is a figure explaining Embodiment 1, 2, and Modification 3-1 of Modifications 1-1, 2-1 to 2-3.

[0031] Fig.16 It is a figure explaining Embodiment 1, 2, and Modification 3-2 of Modifications 1-1, 2-1 to 2-3.

[0032] Fig.17 It is a figure explaining Embodiment 1, 2, and Modification 3-3 of Modifications 1-1, 2-1 to 2-3.

[0033] Fig.18 It is a figure explaining Embodiment 1, 2, and Modification 3-3 of Modifications 1-1, 2-1 to 2-3.

[0034] Description of Reference Numerals

[0035] 1. Endoscope system; 2. Endoscope; 3. Display device; 4. Processing device; 5. Control device; 6. Light source device; 7. Cooling unit; 8. Heat sink; 9. Isolator; 10. Frame member; 11. Sensor; 12. Pressing member; 21. Insertion part; 22. Operation part; 23. Universal cable; 24. Connector part; 25. Light guide; 26. Illumination lens; 27. Camera device; 51. Control part; 52. Storage part; 53. Input part; 61. Light emitting element; 61A. Circuit board; 61A1. Positioning hole; 61A2. Mounting hole; 61B. Chip; 61B1. Light emitting surface; 65. Housing; 71. Pipe; 72. Cooling fan; 81. Heat sink; 101. Opening; 102. Through hole; 103. Through hole; 121. Positioning pin; 122 , opening; 123, through hole; 611, red light source; 612, green light source; 613, blue light source; 621, first lens; 622, second lens; 623, third lens; 624, fourth lens; 631, first dichroic mirror; 632, second dichroic mirror; 633, third dichroic mirror; 651, 652, side wall; 810, positioning hole; 811, first heat sink; 812, second heat sink; 813, third heat sink; 821, first heat dissipation part; 822, second heat dissipation part; 831, first heat pipe; 832, second heat pipe; 833, third heat pipe; LV, imaginary line; P1, P1′, first position; P2, P2′, second position; P3, third position; PT, flow path; SC, fixing member; SP1, first space; SP2, second space. DETAILED DESCRIPTION

[0036] Hereinafter, the mode for implementing the present invention (hereinafter referred to as the embodiment) will be described with reference to the accompanying drawings. In addition, the present invention is not limited to the embodiment described below. In the description of the accompanying drawings, the same reference numerals are given to the same parts.

[0037] (Implementation Method 1)

[0038] [Structure of endoscope system]

[0039] Figure 1 This is a diagram showing the configuration of an endoscope system 1 according to the first embodiment.

[0040] The endoscope system 1 is used in the medical field and is a system for observing the inside of a subject (inside a living body). Figure 1 As shown, the endoscope system 1 includes an endoscope 2 , a display device 3 and a processing device 4 .

[0041] In the first embodiment, the endoscope 2 is a so-called soft endoscope. A portion of the endoscope 2 is inserted into a living body, images are taken of the living body, and image signals generated by the images are output. Figure 1As shown, the endoscope 2 includes an insertion portion 21 , an operation portion 22 , a universal cable 23 , and a connector portion 24 .

[0042] The insertion portion 21 is a portion that is at least partially flexible and is inserted into the body. Figure 1 As shown, a light guide 25 , an illumination lens 26 , and an imaging device 27 are provided in the insertion portion 21 .

[0043] The light guide 25 is led from the insertion portion 21 through the operation portion 22 and the universal cable 23 to the connector portion 24. One end of the light guide 25 is located at the front end portion in the insertion portion 21. In addition, when the endoscope 2 is connected to the treatment device 4, the other end of the light guide 25 is located in the treatment device 4. Thus, the light guide 2 transmits the light supplied from the light source device 6 in the treatment device 4 from the other end to the one end.

[0044] The illumination lens 26 faces one end of the light guide 25 in the insertion portion 21. The illumination lens 26 irradiates the light transmitted by the light guide 25 into the living body.

[0045] The imaging device 27 is provided at the distal end portion of the insertion portion 21. The imaging device 27 includes an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) that receives an image of a subject in the living body and converts it into an electrical signal, and outputs an image signal generated by imaging.

[0046] The operation portion 22 is connected to the proximal end portion of the insertion portion 21. The operation portion 22 receives various operations performed on the endoscope 2.

[0047] The universal cable 23 extends from the operation portion 22 in a direction different from the extending direction of the insertion portion 21 and is a cable provided with a signal line, a light guide 25 , etc. for electrically connecting the imaging device 27 and the control device 5 in the processing device 4 .

[0048] The connector portion 24 is provided at an end portion of the universal cable 23 and is detachably connected to the processing device 4 .

[0049] The display device 3 is an LCD (Liquid Crystal Display) or an EL (ElectroLuminescence) display, and displays an image or the like that has been processed by the processing device 4 .

[0050] like Figure 1As shown, the processing device 4 includes a control device 5 and a light source device 6. In the present embodiment, the light source device 6 and the control device 5 are provided in one housing as the processing device 4, but the present invention is not limited thereto, and the light source device 6 and the control device 5 may be provided in different housings.

[0051] The light source device 6 supplies illumination light to the other end of the light guide 25 under the control of the control device 5 .

[0052] In addition, the detailed structure of the light source device 6 will be described in “Structure of light source device” to be described later.

[0053] The control device 5 generally controls the operation of the entire endoscope system 1. Figure 1 As shown, the control device 5 includes a control unit 51 , a storage unit 52 and an input unit 53 .

[0054] The control unit 51 includes a controller such as a CPU (Central Processing Unit) or an MPU (MicroProcessing Unit) or an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array), and controls the overall operation of the endoscope system 1 .

[0055] The storage unit 52 stores various programs executed by the control unit 51 and information necessary for the processing of the control unit 51 .

[0056] The input unit 53 is configured to receive user operations performed by a user such as a surgeon using a keyboard, a mouse, a switch, a touch panel, etc. The input unit 53 outputs an operation signal corresponding to the user operation to the control unit 51 .

[0057] [Structure of light source device]

[0058] Next, the structure of the light source device 6 will be described.

[0059] Figure 2 is a diagram showing the internal structure of the light source device 6. Figure 2 In FIG. 1 , for convenience of explanation, the cooling unit 7 is indicated by a single-dot chain line.

[0060] like Figure 2As shown, the light source device 6 includes a red light source 611, a green light source 612, a blue light source 613, a first lens 621 to a fourth lens 624, a first dichroic mirror 631 to a third dichroic mirror 633, a cooling unit 7 and a housing 65 that accommodates the above-mentioned components 611 to 613, 621 to 624, 631 to 633, and 7.

[0061] The red light source 611 is composed of a semiconductor light emitting element such as an LED (Light Emitting Diode) or an LD (Laser Diode), and emits red light (e.g., light in a wavelength range of about 600nm to 700nm). The red light source 611 corresponds to the first light emitting element of the present invention, and the first temperature is used as the maximum junction temperature.

[0062] The blue light source 613 is composed of a semiconductor light emitting element such as an LED or LD, and emits blue light (for example, light in a wavelength range of about 430 nm to 490 nm). The blue light source 613 has a second temperature higher than the first temperature as a maximum junction temperature.

[0063] The green light source 612 is composed of a semiconductor light emitting element such as an LED or LD, and emits green light (for example, light in a wavelength range of about 490nm to 550nm). The green light source 612 is equivalent to the second light emitting element of the present invention, and the third temperature above the second temperature is used as the maximum junction temperature. That is, the maximum junction temperature of the red light source 611 is lower than the maximum junction temperature of the green light source 612. In addition, the heat generated by the green light source 612 is greater than the heat generated by the red light source 611.

[0064] The first to third dichroic mirrors 631 to 633 bend the lights from the red light source 611 , the green light source 612 , and the blue light source 613 so as to travel on the same optical axis.

[0065] Specifically, the first dichroic mirror 631 bends the red light emitted from the red light source 611 and focused by the first lens 621 , and transmits light in other wavelength ranges except for the red light.

[0066] The second dichroic mirror 632 bends the green light emitted from the green light source 612 and focused by the second lens 622 , and transmits light in other wavelength ranges except the green light.

[0067] The third dichroic mirror 633 bends the blue light emitted from the blue light source 613 and condensed by the third lens 623 , and transmits light in other wavelength ranges except the blue light.

[0068] The fourth lens 624 collects the illumination light (white light) obtained by combining the red light, the green light, and the blue light after passing through the first to third dichroic mirrors 631 to 633 , and guides the light to the other end of the light guide 25 .

[0069] In addition, in the housing 65, the side wall 651 ( Figure 2 ) is a side wall on the front side where a doctor or the like who operates the endoscope 2 is located. Also, a side wall 652 ( Figure 2 ) is the side wall on the back side.

[0070] The cooling unit 7 dissipates heat generated by the red light source 611 , the green light source 612 , and the blue light source 613 .

[0071] In addition, the detailed structure of the cooling unit 7 will be described in "Structure of cooling unit" described later.

[0072] 〔Cooling unit structure〕

[0073] Next, the structure of the cooling unit 7 will be described.

[0074] Figure 3 and Figure 4 2 is a diagram for explaining the structure of the cooling unit 7. Specifically, Figure 3 It is a plan view showing the overall structure of the cooling unit 7 . Figure 4 8 is a perspective view showing the structure of the radiator 8. Figure 3 In the figure, the Z axis represents an axis parallel to the vertical direction (the +Z axis direction is the upward direction). In addition, the X axis and the Y axis are two axes that are orthogonal to each other and to the Z axis (the +X axis direction is the direction from the side wall 652 on the back side toward the side wall 651 on the front side).

[0075] like Figure 3 and Figure 4 As shown, the cooling unit 7 includes a duct 71 , a cooling fan 72 and a radiator 8 .

[0076] The duct 71 is arranged on the lower side (-Z axis direction side) of the red light source 611, the green light source 612, the blue light source 613, the first lens 621 to the fourth lens 624, and the first dichroic mirror 631 to the third dichroic mirror 633. One end side of the duct 71 is connected to the air intake hole (not shown) formed on the side wall 651 on the front side (+X axis side), and the other end side is connected to the exhaust hole (not shown) formed on the side wall 652 on the back side (-X axis side). Thus, the duct 71 forms a flow path PT ( Figure 3 ). In addition, Figure 3 As shown, for the red light source 611, the green light source 612, and the blue light source 613, the red light source 611 is arranged at a position corresponding to the upstream side (+X-axis side) of the flow path PT, the blue light source 613 is arranged at a position corresponding to the downstream side (-X-axis side) of the flow path PT, and the green light source 612 is arranged between the red light source 611 and the blue light source 613.

[0077] The cooling fan 72 is disposed opposite to the exhaust hole, and forcibly flows air from the air intake hole toward the exhaust hole along the flow path PT in the duct 71 .

[0078] like Figure 3 and Figure 4 As shown, the heat sink 8 includes first to third heat sinks 811 to 813 , a first heat sink 821 , a second heat sink 822 , and first to third heat pipes 831 to 833 .

[0079] like Figure 3 and Figure 4 As shown, the first heat sink 811 has a flat plate shape that is thermally connected to the back surface of the red light source 611 , and is a heat receiving portion that receives heat generated by the red light source 611 .

[0080] like Figure 3 and Figure 4 As shown, the second heat sink 812 has a flat plate shape that is thermally connected to the back surface of the green light source 612 , and is a heat receiving portion that receives heat generated by the green light source 612 .

[0081] like Figure 3 and Figure 4 As shown, the third heat sink 813 has a flat plate shape that is thermally connected to the back surface of the blue light source 613 and is a heat receiving portion that receives heat generated by the blue light source 613 .

[0082] In addition, the first to third heat sinks 811 to 813 are configured as independent components, but are not limited thereto and may be configured as one component common to the red light source 611 , the green light source 612 , and the blue light source 613 .

[0083] The first heat dissipation part 821 is arranged in the duct 71, and is composed of a plurality of plate-shaped fins along the flow path PT (along the XZ plane) on the front and back sides. That is, the first heat dissipation part 821 is arranged on the lower side (-Z axis direction side) of the red light source 611, the green light source 612, the blue light source 613, the first lens 621 to the fourth lens 624, and the first dichroic mirror 631 to the third dichroic mirror 633. In addition, the first heat dissipation part 821 dissipates the heat generated by the red light source 611, the green light source 612, and the blue light source 613 to the air flowing along the flow path PT.

[0084] The second heat dissipation part 822 is arranged in the duct 71, and is composed of a plurality of plate-shaped fins along the flow path PT (along the XZ plane) on the front and back sides. That is, the second heat dissipation part 822 is arranged on the lower side (-Z axis direction side) of the red light source 611, the green light source 612, the blue light source 613, the first lens 621 to the fourth lens 624, and the first dichroic mirror 631 to the third dichroic mirror 633. In addition, the second heat dissipation part 822 dissipates the heat generated by the green light source 612 and the blue light source 613 to the air flowing along the flow path PT.

[0085] That is, the first heat dissipation portion 821 and the second heat dissipation portion 822 are composed of mutually independent members.

[0086] More specifically, if Figure 3 and Figure 4 As shown in FIG. 8 , the length of the plurality of fins constituting the first heat dissipation portion 821 is longer than the length of the plurality of fins constituting the second heat dissipation portion 822. Figure 3 As shown, the first heat sink 821 is arranged at a position closer to the arrangement position of the red light source 611, the green light source 612, and the blue light source 613 than the second heat sink 822 (a position closer to the -Y axis direction side than the second heat sink 822). Moreover, in the first heat sink 821 and the second heat sink 822, the front end of the upstream side (+X axis direction side) of the flow path PT in the second heat sink 822 is located at a position closer to the downstream side (-X axis direction side) than the front end of the upstream side (+X axis direction side) of the flow path PT in the first heat sink 821. That is, in the first heat sink 821 and the second heat sink 822, the first heat sink 821 protrudes toward the upstream side (+X axis direction side) of the flow path PT, and the first heat sink 821 and the second heat sink 822 are arranged in a stepped shape as a whole. As a result, air that does not pass through the first heat sink 821 in the air flowing along the flow path PT flows in the second heat sink 822.

[0087] Here, the intervals between the plurality of fins constituting the second heat dissipating portion 822 are narrower than the intervals between the plurality of fins constituting the first heat dissipating portion 821 .

[0088] like Figure 4 As shown, one end of the first heat pipe 831 is thermally connected to the first heat sink 811, and the first heat pipe 831 extends from the one end toward the lower side (-Z axis direction side) and bends approximately 90 degrees to extend toward the +Y axis direction. In addition, the first heat pipe 831 is thermally connected to the first heat sink 821 in a state where the end portion of the other end side respectively penetrates the plurality of fins constituting the first heat sink 821. Thus, the first heat pipe 831 transfers the heat of the first heat sink 811 (the heat of the red light source 611) from one end to the other end.

[0089] like Figure 4As shown, one end of the second heat pipe 832 is thermally connected to the second heat sink 812, and the second heat pipe 832 extends from the one end toward the lower side (-Z axis direction side) and bends approximately 90 degrees to extend toward the +Y axis direction. In addition, the second heat pipe 832 is thermally connected to the first heat sink 821 and the second heat sink 822 in a state where the end portion of the other end side respectively penetrates the multiple fins constituting the first heat sink 821 and the multiple fins constituting the second heat sink 822. Thus, the second heat pipe 832 transfers the heat of the second heat sink 812 (the heat of the green light source 612) from one end to the other end.

[0090] like Figure 4 As shown, one end of the third heat pipe 833 is thermally connected to the third heat sink 813, and the third heat pipe 833 extends from the one end toward the lower side (-Z axis direction side) and bends approximately 90 degrees to extend toward the +Y axis direction. In addition, the third heat pipe 833 is thermally connected to the first heat sink 821 and the second heat sink 822 in a state where the end of the other end side respectively penetrates the multiple fins constituting the first heat sink 821 and the multiple fins constituting the second heat sink 822. Thus, the third heat pipe 833 transfers the heat of the third heat sink 813 (the heat of the blue light source 613) from one end to the other end.

[0091] Here, the allowable thermal resistance of the heat sink of the red light source 611 obtained from the difference between the maximum junction temperature (first temperature) and the ambient temperature and the calorific value is greater than the allowable thermal resistance of the heat sink of the green light source 612 obtained from the difference between the maximum junction temperature (third temperature) and the ambient temperature and the calorific value. More specifically, the allowable thermal resistance is a value obtained by dividing the difference [°C] between the maximum junction temperature and the ambient temperature by the calorific value [W].

[0092] According to the first embodiment described above, the following effects are achieved.

[0093] In the light source device 6 of the first embodiment, the heat sink 8 includes: a first heat sink 821, which is arranged on the air flow path PT and dissipates the heat of the red light source 611 and the green light source 612 to the air; and a second heat sink 822, which is arranged on the flow path PT and dissipates the heat of the green light source 612 to the air. In addition, the allowable thermal resistance of the heat sink of the red light source 611 obtained from the difference between the maximum junction temperature (first temperature) and the ambient temperature and the calorific value is greater than the allowable thermal resistance of the heat sink of the green light source 612 obtained from the difference between the maximum junction temperature (third temperature) and the ambient temperature and the calorific value. Moreover, of the first heat sink 821 and the second heat sink 822, the first heat sink 821 protrudes toward the upstream side (+X axis direction side) of the flow path PT, and the first heat sink 821 and the second heat sink 822 are arranged in a stepped shape as a whole. Thus, of the air flowing along the flow path PT, air that does not pass through the first heat dissipation portion 821 flows through the second heat dissipation portion 822 .

[0094] Therefore, the heat of the green light source 612 with a large heat generation can be sufficiently dissipated, and the temperature of the red light source 611 adjacent to the green light source 612 does not rise. That is, the red light source 611 can maintain an appropriate temperature and maintain the luminous efficiency of the red light source 611 well.

[0095] Therefore, according to the light source device 6 of the first embodiment, the red light source 611 and the green light source 612 can efficiently dissipate the heat of the red light source 611 and the green light source 612 while using the common first heat dissipation portion 821 .

[0096] In particular, the intervals between the plurality of fins constituting the second heat dissipation portion 822 are narrower than the intervals between the plurality of fins constituting the first heat dissipation portion 821. Therefore, the flow rate of the air flowing between the plurality of fins constituting the second heat dissipation portion 822 can be increased, and the temperature of the green light source 612 can be preferentially reduced. As a result, the temperature of the red light source 611 adjacent to the green light source 612 can also be reduced.

[0097] (Variation 1-1)

[0098] Figure 5 and Figure 6 This is a diagram for explaining Modification 1-1 of Embodiment 1. Specifically, Figure 5 is with Figure 3 The corresponding figure. Figure 6 is with Figure 4 The corresponding figure.

[0099] In the above-mentioned first embodiment, the first heat dissipation part 821 is arranged at a position closer to the arrangement positions of the red light source 611, the green light source 612, and the blue light source 613 than the second heat dissipation part 822 (a position closer to the -Y axis side than the second heat dissipation part 822), but it is not limited to this. Figure 5 and Figure 6 As in the present modification 1-1 shown, the second heat sink 822 is disposed closer to the arrangement positions of the red light source 611 , the green light source 612 , and the blue light source 613 than the first heat sink 821 (closer to the −Y axis side than the first heat sink 821 ).

[0100] According to the above-described modification 1-1, in addition to the same effects as those of the above-described embodiment 1, the following effects are achieved.

[0101] In this modification 1-1, compared with the configuration of the above-described first embodiment, the second heat sink 822 is disposed closer to the positions of the red light source 611 , the green light source 612 , and the blue light source 613 than the first heat sink 821 . Therefore, the green light source 612 can be cooled preferentially.

[0102] (Implementation Method 2)

[0103] Next, embodiment 2 will be described.

[0104] In the following description, the same reference numerals are used for the same structures as those in the first embodiment described above, and the detailed description thereof will be omitted or simplified.

[0105] Figure 7 to Figure 9 2 is a diagram for explaining the structure of the heat sink 8 according to the second embodiment. Specifically, Figure 7 is with Figure 4 The corresponding figure. Figure 8 This is a diagram of the heat sink 8 as viewed from the +X axis direction side. Fig. 9 This is a diagram of the heat sink 8 viewed from the +Y axis direction side. Fig. 9 In the figure, for the convenience of explanation, the second heat dissipation portion 822 is omitted.

[0106] In the second embodiment, the structure of the heat sink 8 is changed compared with the first embodiment. More specifically, in the heat sink 8 of the first embodiment, Fig. 9 As shown, the first heat pipe 831 to the third heat pipe 833 are respectively arranged at the first position P1 to the third position P3 on the imaginary line LV along the direction of the flow path PT, that is, the X-axis direction in the first heat dissipation section 821. That is, the height positions of the first position P1 to the third position P3 are all the same. The X-axis direction is equivalent to the first direction of the present invention. In contrast, in the radiator 8 of the present embodiment 2, the first heat pipe 831 and the second heat pipe 832 are respectively arranged at the first position P1′ and the second position P2′ in the first heat dissipation section 821 after the first position P1 and the second position P2 are separated from each other along the Z-axis direction. More specifically, the height position of the first position P1′ is higher than the height position of the second position P2′. The Z-axis direction is equivalent to the second direction of the present invention. In addition, the third heat pipe 833 is arranged at the third position P3 in the first heat dissipation section 821 in the same manner as in the above-mentioned embodiment 1.

[0107] According to the second embodiment described above, in addition to the same effects as those of the first embodiment described above, the following effects are achieved.

[0108] In the light source device 6 of the second embodiment, the first heat pipe 831 and the second heat pipe 832 are respectively arranged at the first position P1′ and the second position P2′ in the first heat dissipation section 821 after the first position P1 and the second position P2 are separated from each other along the Z-axis direction. Therefore, it is possible to realize a structure in which the air heated by the first heat dissipation section 821 (red light source 611) connected to the first heat pipe 831 on the upstream side of the flow path PT is not easily introduced into the second heat pipe 832 arranged on the downstream side of the flow path PT. That is, it is possible to realize a structure in which the temperature of the green light source 612 is easily reduced, and the temperature of the red light source 611 adjacent to the green light source 612 is also reduced.

[0109] (Variation 2-1)

[0110] Fig.10 and Fig.11 This is a diagram for explaining a modified example 2-1 of the second embodiment. Specifically, Fig.10 is with Figure 3 The corresponding figure is a plan view showing the overall structure of the cooling unit 7 according to the present modification 2-1. Fig.11 is with Figure 7 The corresponding figure.

[0111] In the above-mentioned embodiment 2, it is also possible to Fig.10 and Fig.11 As in the present modification 2-1 shown, a spacer 9 is used.

[0112] The spacer 9 has a comb-tooth shape, such as Fig.10 and Fig.11 As shown, in the first heat dissipation part 821, the spacer 9 is arranged in a state of being inserted into the portion protruding toward the upstream side of the flow path PT relative to the second heat dissipation part 822. Thus, the spacer 9 divides the air flowing along the flow path PT in the Z-axis direction and divides it into the first space SP1 ( Fig.11 ) and the second space SP2 on the second heat pipe 832 side ( Fig.11 ) circulates.

[0113] According to the above-described modification 2-1, in addition to the same effects as those of the above-described second embodiment, the following effects are achieved.

[0114] In this modification 2-1, the above-mentioned spacer 9 is used. Therefore, a larger amount of fresh air can be introduced into the second heat pipe 832 disposed on the downstream side of the flow path PT. That is, a structure that easily lowers the temperature of the green light source 612 can be realized, and the temperature of the red light source 611 adjacent to the green light source 612 can also be lowered.

[0115] (Variant 2-2)

[0116] Fig.12 This is a diagram for explaining a modified example 2-2 of the second embodiment. Specifically, Fig.12 is with Fig.11 The corresponding figure.

[0117] In the first heat dissipation portion 821 of the above-mentioned modification 2-1, it is also possible to Fig.12 As shown in the present modification 2-2, a portion of the second space SP2 side divided by the spacer 9 is omitted from the portion protruding toward the upstream side (+X axis direction side) of the flow path PT relative to the second heat dissipating portion 822. The spacer 9 may or may not be provided.

[0118] Even when the configuration of the above-described modification 2-2 is adopted, the same effects as those of the above-described modification 2-1 are achieved.

[0119] (Variation 2-3)

[0120] Fig.13 This is a diagram for explaining a modification 2-3 of the second embodiment. Specifically, Fig.13 is with Fig.12 The corresponding figure.

[0121] You can also Fig.13 As in the present modification 2-3 shown, the plurality of fins constituting the second heat dissipating portion 822 of the above-mentioned modification 2-2 are changed to the same shape as the plurality of fins constituting the first heat dissipating portion 821 of the above-mentioned modification 2-2.

[0122] Even when the configuration of the above-described modification example 2-3 is adopted, the same effects as those of the above-described modification example 2-2 are achieved.

[0123] (Other embodiments)

[0124] Although the modes for carrying out the present invention have been described above, the present invention should not be limited to only the above-described Embodiments 1 and 2 and Modifications 1-1 and 2-1 to 2-3.

[0125] In the above-mentioned embodiments 1, 2 and variations 1-1, 2-1 to 2-3, the light source device of the present invention is mounted on an endoscope system 1 using a flexible endoscope, but it is not limited to this and can also be mounted on an endoscope system using a rigid endoscope. In addition, as a light source device of the present invention, it can also be mounted on an observation system using a surgical microscope that magnifies and photographs a predetermined field of view area inside a subject (inside a living body) or on the surface of a subject (on the surface of a living body).

[0126] In the above-mentioned embodiments 1, 2 and modified examples 1-1, 2-1 to 2-3, the first light emitting element of the present invention is set as a red light source 611, and the second light emitting element of the present invention is set as a green light source 612, but the present invention is not limited to this. The wavelength range of the light emitted by the first light emitting element and the second light emitting element is not limited to the wavelength range described in the above-mentioned embodiments 1, 2 and modified examples 1-1, 2-1 to 2-3, and can also be set to other wavelength ranges.

[0127] In the above-mentioned Embodiments 1 and 2 and Modifications 1-1, 2-1 to 2-3, the first heat sink and the second heat sink of the present invention are not limited to being formed of a plurality of plate-like fins, but may be formed of a plurality of protruding fins or may be formed in a block shape.

[0128] In the above-mentioned Embodiments 1 and 2 and Modifications 1-1 and 2-1 to 2-3, Modifications 3-1 to 3-3 described below may be adopted.

[0129] (Variant 3-1)

[0130] Hereinafter, for convenience of description, the red light source 611, the green light source 612, and the blue light source 613 are collectively referred to as the light emitting element 61. In addition, the first heat sink 811 to the third heat sink 813 are collectively referred to as the heat sink 81.

[0131] Fig.14 and Fig.15 This is a diagram for explaining Embodiments 1 and 2 and Modification 3-1 of Modifications 1-1, 2-1 to 2-3. Specifically, Fig.14 This is a diagram of the light emitting element 61 as viewed from the front side (the side from which light is emitted). Fig.15 This is a diagram showing a fixing structure of the light emitting element 61 to the heat sink 81 as viewed from the front side.

[0132] In the above-mentioned embodiments 1, 2 and modifications 1-1, 2-1 to 2-3, as the fixing structure of the light emitting element 61 to the heat sink 81, it is also possible to adopt Fig.15 The fixing structure of the modified example 3-1 is shown.

[0133] Here, if Fig.14 As shown, the light emitting element 61 has a structure in which a chip 61B is mounted on a circuit board 61A, and the chip 61B has a light emitting surface 61B1 for emitting light. In addition, a pair of positioning holes 61A1 are provided at two positions across the light emitting surface 61B1 in the circuit board 61A, respectively penetrating the front and back of the circuit board 61A. In addition, a pair of mounting holes 61A2 are provided at two positions across the light emitting surface 61B1 in the circuit board 61A, respectively penetrating the front and back of the circuit board 61A.

[0134] Furthermore, in the present modification 3-1, as a fixing structure of the light emitting element 61 with respect to the heat sink 81, as shown in FIG. Fig.15 As shown, a frame member 10 is used.

[0135] The frame member 10 is formed of a plate body, and the light emitting element 61 is sandwiched between the frame member 10 and the heat sink 81. Fig.15 As shown, an opening 101 is provided at a position opposite to the light-emitting surface 61B1 in the frame member 10, and the opening 101 passes through the front and back, and allows the light emitted from the light-emitting surface 61B1 to pass through. That is, the frame member 10 has a Japanese katakana shape. In addition, through holes 102 are provided at positions opposite to the pair of mounting holes 61A2 in the frame member 10, respectively, and the through holes 102 pass through the front and back, and allow fixing members SC such as screws to pass through.

[0136] The frame member 10 described above is preferably made of a resin having insulating properties and light resistance to ultraviolet rays. Examples of the resin include PEEK (polyetheretherketone), polycarbonate, and acrylic.

[0137] Furthermore, the light emitting element 61 is mounted on the heat sink 81 as follows.

[0138] First, the operator inserts positioning pins (not shown) into the pair of positioning holes 61A1 of the light emitting element 61 and inserts the positioning pins into the pair of positioning holes (not shown) formed in the heat sink 81. Thus, the light emitting element 61 is optically positioned.

[0139] Next, the operator places the frame member 10 against the front side of the light emitting element 61, passes the fixing member SC through the pair of through holes 102 of the frame member 10 and the pair of mounting holes 61A2 of the light emitting element 61, and fastens the fixing member SC to the heat sink 81. Thus, the light emitting element 61 is fixed to the heat sink 81.

[0140] According to the above-described modification 3-1, in addition to the same effects as those of the above-described embodiments 1 and 2 and modifications 1-1 and 2-1 to 2-3, the following effects are achieved.

[0141] In this modification 3-1, the frame member 10 described above is used. Therefore, the frame member 10 can be used to disperse the fastening force of the fixing member SC, and the back surface of the light emitting element 61 can be uniformly pressed against the heat sink 81. As a result, the contact thermal resistance between the light emitting element 61 and the heat sink 81 can be reduced, and the heat of the light emitting element 61 can be effectively dissipated to the heat sink 81.

[0142] In addition, a thermally conductive sheet such as TIM (Thermal Interface Material) may be interposed between the back surface of the light emitting element 61 and the heat sink 81. This also applies to Modifications 3-2 and 3-3 described below.

[0143] (Variant 3-2)

[0144] Fig.16 This is a diagram for explaining Embodiments 1 and 2 and Modification 3-2 of Modifications 1-1 and 2-1 to 2-3. Specifically, Fig.16 is with Fig.15 The corresponding figure.

[0145] In the above-mentioned modification 3-1, when the sensor 11 ( Fig.16 ) can also be used Fig.16 The frame member 10 of the present modification 3-2 is shown.

[0146] like Fig.16 As shown, in the frame member 10 of the present modification 3-2, a part of the edge portion of the opening 101 is cut away to avoid mechanical interference with the sensor 11. That is, the frame member 10 of the present modification 3-2 has a Japanese Katakana U shape.

[0147] Even when the configuration of the above-described modification 3-2 is adopted, the same effects as those of the above-described modification 3-1 are achieved.

[0148] (Variant 3-3)

[0149] Fig.17 and Fig.18 This is a diagram for explaining Embodiments 1 and 2 and Modification 3-3 of Modifications 1-1 and 2-1 to 2-3. Specifically, Fig.17 This is a perspective view of the fixing structure of the light emitting element 61 relative to the heat sink 81 as viewed from the front side. Fig.17 In FIG. 1 , for convenience of explanation, a structure using four light emitting elements 61 is shown. Fig.17 In the embodiment, the heat sink 81 is provided as a component shared by the four light emitting elements 61 . Fig.18 yes Fig.17 Cross-sectional view of line A-A.

[0150] In the above-mentioned embodiments 1, 2 and modifications 1-1, 2-1 to 2-3, as the fixing structure of the light emitting element 61 to the heat sink 81, it is also possible to adopt Fig.17 and Fig.18 The fixing structure of the present modification 3-3 is shown.

[0151] In the present modification 3-3, as a fixing structure of the light emitting element 61 to the heat sink 81, as shown in FIG. Fig.17 and Fig.18 As shown, using frame member 10 ( Fig.18 ) and a pressing member 12.

[0152] Here, if Fig.17 As shown, similarly to the above-mentioned modification 3-2, the sensor 11 is mounted on the light emitting element 61. Moreover, the frame member 10 of this modification 3-3 has the same shape as that of the above-mentioned modification 3-2. That is, the frame member 10 of this modification 3-3 is provided for each light emitting element 61.

[0153] Furthermore, the frame member 10 of the present modification 3-3 is made of an elastic body having elasticity such as fluororubber.

[0154] Furthermore, in the frame member 10 of the present modification 3-3, a through hole 103 is provided at a position opposite to the pair of positioning holes 61A1. The through hole 103 passes through the front and back sides and allows the positioning pin 121 to pass therethrough ( Fig.18 ).

[0155] like Fig.17 As shown, the pressing member 12 of the present modification 3-3 is provided as a member common to the four light emitting elements 61. Alternatively, the pressing member 12 may be provided for each light emitting element 61.

[0156] The pressing member 12 is formed of a plate body, and sandwiches the light emitting element 61 and the frame member 10 between the pressing member 12 and the heat sink 81 .

[0157] like Fig.18 As shown in FIG. 1 , positioning pins 121 are provided on the back surface of the pressing member 12 at positions opposing the pair of positioning holes 61A1 , each of which protrudes toward the back surface side.

[0158] In addition, if Fig.17 As shown, an opening 122 is provided at a position opposite to the light emitting surface 61B1 in the pressing member 12, and the opening 122 passes through the front and back sides, and allows light emitted from the light emitting surface 61B1 to pass through. Here, in the pressing member 12, as in the frame member 10, a part of the edge of the opening 122 is missing to avoid mechanical interference with the sensor 11.

[0159] And, if Fig.18 As shown, through holes 123 are provided at positions of the pressing member 12 that avoid the light emitting element 61 and the frame member 10 . The through holes 123 penetrate the front and back sides and allow the fixing member SC to pass through.

[0160] Furthermore, the light emitting element 61 is mounted on the heat sink 81 as follows.

[0161] First, the operator inserts the positioning pins 121 into the pair of through holes 103 of the frame member 10 and the pair of positioning holes 61A1 of the light emitting element 61, and inserts the positioning pins 121 into the pair of positioning holes 810 formed in the heat sink 81 ( Fig.18 ). Thus, the light emitting element 61 is optically positioned.

[0162] Next, the operator inserts the fixing members SC into the pair of through holes 123 of the pressing member 12 , respectively, and fastens the fixing members SC to the heat sink 81 . Thus, the light emitting element 61 is fixed to the heat sink 81 .

[0163] Even when the configuration of the above-described modification 3-3 is adopted, the same effects as those of the above-described modifications 3-1 and 3-2 can be achieved.

Claims

1. A light source device, wherein: The light source device comprises: a first light emitting element; a second light emitting element; and a heat sink for dissipating heat from the first light emitting element and the second light emitting element, The radiator comprises: a first heat dissipation portion disposed on a flow path of the fluid and dissipating heat of the first light emitting element and the second light emitting element into the fluid; and a second heat dissipation portion disposed on the flow path and dissipating heat of the second light emitting element to the fluid; The allowable thermal resistance of the heat sink of the first light emitting element obtained based on the difference between the maximum junction temperature and the ambient temperature and the heating value is greater than the allowable thermal resistance of the heat sink of the second light emitting element obtained based on the difference between the maximum junction temperature and the ambient temperature and the heating value.

2. The light source device according to claim 1, wherein: The fluid that does not pass through the first heat dissipation portion flows in the second heat dissipation portion.

3. The light source device according to claim 2, wherein: In the first heat dissipation part and the second heat dissipation part, the front end of the upstream side of the flow path in the second heat dissipation part is located downstream of the front end of the upstream side of the flow path in the first heat dissipation part, and the first heat dissipation part and the second heat dissipation part are arranged in a stepped shape as a whole.

4. The light source device according to claim 2, wherein: The first light emitting element is arranged at a position corresponding to an upstream side of the flow path with respect to the second light emitting element.

5. The light source device according to claim 1, wherein: The radiator further comprises: a first heat pipe thermally connecting the first light emitting element and the first heat dissipating portion; and The second heat pipe thermally connects the second light emitting element to the first heat dissipation portion and the second heat dissipation portion.

6. The light source device according to claim 5, wherein: The first heat pipe and the second heat pipe are respectively arranged in the first heat dissipation part at positions after two positions, namely, a first position and a second position, on an imaginary line along the direction of the flow path, namely, the first direction, are separated from each other along a second direction, and the second direction is orthogonal to the first direction and to an extension direction of the first heat pipe and the second heat pipe intersecting the first direction.

7. The light source device according to claim 6, wherein: The first heat dissipation part is composed of a plurality of fins. The first heat dissipating portion is provided with a separator that divides the fluid in the second direction so as to flow through a first space on the first heat pipe side and a second space on the second heat pipe side.

8. The light source device according to claim 1, wherein: The first heat dissipation portion and the second heat dissipation portion are formed of mutually independent members.

9. The light source device according to claim 1, wherein: The first heat dissipation portion and the second heat dissipation portion are respectively formed of a plurality of fins.

10. The light source device according to claim 9, wherein: The intervals between the plurality of fins constituting the second heat dissipating portion are narrower than the intervals between the plurality of fins constituting the first heat dissipating portion.

11. The light source device according to claim 1, wherein: The maximum junction temperature of the first light emitting element is lower than the maximum junction temperature of the second light emitting element.

12. The light source device according to claim 1, wherein: The second light emitting element generates a greater amount of heat than the first light emitting element.

13. The light source device according to claim 1, wherein: The first light emitting element is a light emitting element that emits red light.

14. The light source device according to claim 1, wherein: The second light emitting element is a light emitting element that emits green light.

15. The light source device according to claim 1, wherein: The first light emitting element and the second light emitting element are semiconductor light emitting elements.

16. A cooling method for cooling a first light emitting element and a second light emitting element thermally connected to a heat sink having a first heat dissipation portion and a second heat dissipation portion, wherein: The allowable thermal resistance of the heat sink of the first light emitting element obtained based on the difference between the maximum junction temperature and the ambient temperature and the calorific value is made larger than the allowable thermal resistance of the heat sink of the second light emitting element obtained based on the difference between the maximum junction temperature and the ambient temperature and the calorific value, dissipating heat of the first light emitting element and the second light emitting element toward a first heat dissipation portion disposed on a flow path of the fluid, The heat of the second light emitting element is dissipated to a second heat dissipation portion disposed on a flow path of the fluid.

17. A light source device, wherein: The light source device comprises: a first light emitting element; a second light emitting element; and a heat sink for dissipating heat from the first light emitting element and the second light emitting element, The radiator comprises: a first heat dissipation portion disposed on a flow path of the fluid and dissipating heat of the first light emitting element and the second light emitting element into the fluid; a second heat dissipation portion disposed on the flow path and dissipating heat of the second light emitting element to the fluid; a first heat pipe thermally connecting the first light emitting element and the first heat dissipation portion; and The second heat pipe thermally connects the second light emitting element to the first heat dissipating portion and the second heat dissipating portion.

18. The light source device according to claim 17, wherein: The maximum junction temperature of the first light emitting element is higher than the maximum junction temperature of the second light emitting element.

19. The light source device according to claim 17, wherein: The first light emitting element generates less heat than the second light emitting element.

20. The light source device according to claim 17, wherein: The allowable thermal resistance of the heat sink of the first light-emitting element calculated based on the difference between the maximum junction temperature of the first light-emitting element and the ambient temperature and the calorific value of the first light-emitting element is greater than the allowable thermal resistance of the heat sink of the second light-emitting element calculated based on the difference between the maximum junction temperature of the second light-emitting element and the ambient temperature and the calorific value of the second light-emitting element.

Images