JP6957540B2 - Lighting device - Google Patents

Description

The present invention relates to a lighting device, particularly to a heat dissipation mechanism of the lighting device.

Conventionally, heat countermeasures have been taken in lighting devices because the light source generates heat due to light emission. The main methods of heat countermeasures are those that use heat-resistant members for heat transfer members, those that promote heat dissipation and heat diffusion to suppress local heat generation, and those that limit light emission on the firmware to prevent light emission. And so on.

As another method, in Patent Document 1, a shielding wall that transmits light is provided between the discharge tube and the Fresnel panel, and a plurality of vents that connect the space between the Fresnel panel and the shielding wall to the outside air are provided. The lighting device is disclosed.

Japanese Unexamined Patent Publication No. 2012-32822

However, in the technique disclosed in Patent Document 1, since the outside air is allowed to escape between the shielding wall and the Frenel panel, heat is not dissipated in the vicinity of the discharge tube, which is a heat generation source, and the durability of the discharge tube may be lowered. There is.

Therefore, an object of the present invention is to provide a lighting device capable of protecting a member involved in light emission from heat associated with light emission.

In order to achieve the above object, the lighting device according to the present invention transmits a light source having a discharge tube, a first optical member that transmits light emitted by the light source, and light emitted by the light source. , The second optical member arranged between the light source and the first optical member, the first space which is an internal space including the light source, the first optical member and the second optical a second space is a space between the member, in a lighting device for chromatic and blowing mechanism for moving the air, the blower mechanism has a fan, the fan, the irradiation of the illumination device It is arranged at a position aligned with the light source in the first direction parallel to the optical axis direction and the third direction orthogonal to the second direction parallel to the longitudinal direction of the light source, and the width of the third direction is It is characterized in that it is smaller than the width in the first direction.

According to the present invention, it is possible to protect a member involved in light emission from heat associated with light emission.

It is an external perspective view of the strobe device 100 which concerns on 1st Embodiment of this invention. It is an exploded perspective view which shows the inside of the control part 100b which concerns on 1st Embodiment of this invention. It is a vertical sectional view of the strobe device 100 which concerns on 1st Embodiment of this invention. It is an exploded perspective view which shows the inside of the light emitting part 100a which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure which the blower fan 155 is attached to the lower cover 104 which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of the outlet of the flow path 156 of the upper cover 103 which concerns on 1st Embodiment of this invention. It is a front view of the discharge tube 102 and the blower fan 155 which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of the air passage of the hood 142 which concerns on 1st Embodiment of this invention. It is sectional drawing which showed the main air flow of the light emitting part 100a which concerns on 1st Embodiment of this invention. 9 is a cross-sectional view showing a cross-sectional curve of FIG. 9 and a main air flow indicated by arrows. It is a vertical sectional view of the light emitting part 100a in the strobe device 200 which concerns on the 2nd Embodiment of this invention. It is sectional drawing which showed the main air flow of the light emitting part 100a which concerns on 2nd Embodiment of this invention. It is a vertical sectional view of the light emitting part 100a in the strobe device 300 which concerns on 3rd Embodiment of this invention. It is sectional drawing which showed the main air flow of the light emitting part 100a which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the heat radiation fin 301 which looked at the light emitting part 100a which concerns on 3rd Embodiment of this invention from the lower surface side. It is a vertical sectional view of the light emitting part 100a in the strobe device 400 which concerns on 4th Embodiment of this invention. It is sectional drawing which showed the main air flow of the light emitting part 100a which concerns on 4th Embodiment of this invention. It is a perspective view which showed the flow path 403 in the light emitting part 100a which concerns on 4th Embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In each figure, the same member is given the same reference number, and duplicate description is omitted.

(First Embodiment)
First, the appearance of the strobe device 100, which is the lighting device according to the first embodiment of the present invention, will be described with reference to FIG. FIG. 1 is an external perspective view of the strobe device 100 according to the present embodiment, and FIG. 1A is a view of the strobe device 100 as viewed from the front side on which an acrylic panel 101, which is an optical panel, is arranged. (B) shows the views seen from the back side (operation unit side) of the strobe device 100.

The strobe device 100 is roughly divided into a light emitting unit 100a (first housing) on the upper side and a control unit 100b (second housing) on the lower side. The light emitting unit 100a is provided with a discharge tube 102 as a light source inside, and has a bounce function of changing the irradiation direction of the irradiation light from the acrylic panel 101 by a swirling operation with respect to the control unit 100b. The light emitting unit 100a is mainly composed of an upper cover 103, a lower cover 104, and a cylindrical bounce case 105. Further, the upper cover 103 is provided with a wide panel cover 106 for accommodating the wide panel 108 that spreads the light distribution at the time of light emission. The wide panel 108 is an optical member having a light diffusing property that spreads the irradiation light from the acrylic panel 101 in a wider angle. It is pulled out from the wide panel cover 106 at the time of use and is arranged so as to cover the front surface of the acrylic panel 101. As an auxiliary optical member, a wide catch light sheet that reflects the irradiation light in the Z direction to give a catch light effect to the subject when the light emitting portion 100a is rotated to direct the irradiation direction of the irradiation light upward (Y direction). The configuration may be arranged instead of the panel 108. Alternatively, the wide panel 108 and the catch light sheet may be arranged together. Further, a side rubber 107 is provided at the mating portion of the upper cover 103 and the lower cover 104 to prevent slipping when the light emitting portion 100a is manually swiveled. The upper cover 103 and the lower cover 104 can rotate in the vertical direction (in the ZZ plane) relative to the bounce case 105. The bounce case 105 can perform a turning operation in a horizontal direction (in-plane direction of the XZ) relative to the control unit 100b. In this way, the 100a is rotatable relative to the control unit 100b and operates so as to change the irradiation direction of the light from the discharge tube 102. Further, the control unit 100b supports the light emitting unit 100a and controls the operation of the light emitting unit 100a.

The rear cover 109, which is an exterior member, is provided on the back side of the control unit 100b. An operation unit such as a display unit 110, a power switch 111, an operation button 112, and a dial 113 is arranged on the rear cover 109, and various function settings can be made. The battery lid 114 is an openable / closable lid for loading the battery 125 for power supply inside the control unit 100b. The bottom cover 115, which is an exterior member on the lower surface side, is provided with a leg portion 116 which is a connection portion for detachably attaching to an accessory shoe of a camera which is an imaging device (not shown) so as to surround the leg portion 116. A drip-proof cover 117 is attached. The leg 116 can be fixed to an accessory shoe of a camera (not shown) by rotating the lock lever 118. The front cover 119 is an exterior member on the front side of the control unit 100b. A bulge portion 119a (bulging portion) protruding forward thereof is provided in the central portion of the front cover 119. In the lower half of the bulge portion 119a, a light receiving window 120 for optical pulse communication and an AF auxiliary light irradiation window 121 that assists the focus detection of the camera at low brightness are arranged. A light receiving sensor 122 for external dimming is provided in a part of the light receiving window 120 for optical pulse communication, and dimming by the strobe device 100 alone is possible in addition to dimming by a camera (not shown). Various terminal covers 123 are provided on the side of the control unit 100b opposite to the battery cover 114, and an external power supply terminal, a bracket fixing screw, a synchro terminal, and the like are provided inside. Further, a drip-proof packing (not shown) is provided at the mating portion of each exterior member, and has dust-proof and drip-proof performance together with the terminal cover 123 and the drip-proof cover 117.

As described above, in the present embodiment, the side of the control unit 100b where the bulge portion 119a is provided is the front side (front side), and the side where the display unit 110 and various operation units are provided is the back side (rear surface side). ), And the side of the control unit 100b where the legs 116 are provided is the lower surface side. The X direction shown in FIG. 1 corresponds to the left-right direction of the control unit 100b, the Y direction corresponds to the vertical direction of the control unit 100b, and the Z direction corresponds to the front-rear direction of the control unit 100b. Unless otherwise specified, the left-right direction, the up-down direction, and the front-back direction of the strobe device 100 are assumed to be equal to the left-right direction, the up-down direction, and the front-back direction of the control unit 100b.

Next, the internal configuration of the control unit 100b will be described with reference to FIGS. 2 and 3. FIG. 2 is an exploded perspective view showing the inside of the control unit 100b as viewed from the front side by removing the front cover 119 and the bottom cover 115 from the control unit 100b. FIG. 3 is a cross-sectional view showing a cross section orthogonal to the left-right direction of the strobe device 100.

A battery case 124 is provided in the center of the inside of the control unit 100b. In the battery storage portion 124a of the battery case 124, batteries 125 for power supply (in this embodiment, four AA batteries) are stored in a substantially square arrangement. A predetermined space region 126 is provided above the battery storage portion 124a with a shaft portion 105a for left-right rotation (for rotation in the XZ plane) of the lower surface of the bounce case protruding from the light emitting portion 100a. The space area 126 is provided to store the wire harness 127 in a relaxed state. The wire harness 127 is connected to the main board 128 and the sub board 129, which will be described later.

A main board 128 having a digital circuit is arranged on the back side of the battery case 124, that is, on the rear cover 109 side, and the CPU 130 is mounted on the main board 128. Further, on the main board 128, switch elements corresponding to various operation members such as a power switch 111 arranged on the rear cover 109 are also mounted. An LCD 131 (liquid crystal display) is arranged inside the display unit 110. A booster circuit board 133 having a step-up transformer 132 and a sub-board 129 having a light emission control circuit having a FET (field effect transistor) (not shown) are attached to the front side and the lower surface side of the battery case 124, respectively. ..

The pedestal 134 and the sub-board 129 are attached to the front side of the battery case 124 so as to overlap each other. On the front side of the pedestal 134, the wireless module 135 is attached by a plurality of locking claws 134a integrally formed with the pedestal 134. An antenna 135a (chip antenna) for wireless communication is mounted on the upper end side of the wireless module 135. A flexible board (not shown) connected to the main board 128 is connected to a connector (not shown) on the lower end side of the wireless module 135. Further, the optical pulse light receiving sensor 136 is arranged at a position facing the light pulse communication light receiving window 120 provided in the lower part of the front cover 119. Further, in the AF auxiliary light irradiation window 121, the AF auxiliary light unit 138 is arranged at a position facing the prism 137, and a single pattern emitted from the AF auxiliary light unit 138 is divided into a plurality of light rays by the prism 137. Project. In this embodiment, three AF auxiliary light units 138 are mounted.

Next, the internal configurations of the light emitting unit 100a and the bounce case 105 will be described with reference to FIGS. 3 and 4. FIG. 4 is an exploded perspective view showing the inside of the light emitting unit 100a by removing the upper cover 103 and the lower cover 104 from the light emitting unit 100a. FIG. 4A shows a view of the light emitting unit 100a viewed from the upper surface side, and FIG. 4B shows a view of the light emitting unit 100a viewed from the lower surface side.

The strobe device 100 in this embodiment has an electric zoom function that changes the irradiation angle by changing the relative distance between the Fresnel lens 140 and the discharge tube 102 inside the acrylic panel 101. The acrylic panel 101 has a function (including impact and thermal protection) of adjusting the light distribution of the light emitted from the Fresnel lens 140, adjusting the color temperature of the light, and protecting the contact with the Fresnel lens 140 from the outside. ing. The Fresnel lens 140 is an optical lens as an optical member that transmits the light emitted from the discharge tube 102, in which a Fresnel lens portion having an optical action of changing the light distribution of the incident light emitted from the discharge tube 102 is formed. Is. In the present embodiment, the optical system is described as a two-element optical system consisting of an acrylic panel 101 and a Fresnel lens 140, but the function of the acrylic panel 101 may be added to the Fresnel lens 140 to form a single optical system. The Fresnel lens 140 is made of a resin material, glass, or the like. Further, in the present embodiment, the Fresnel lens 140 is described as an example of an optical member having an optical action of changing the light distribution of the incident light emitted from the discharge tube 102, but the optical member having the above optical action is used. If there is, it does not have to be a Fresnel lens.

Most of the inside of the light emitting unit 100a is occupied by the light emitting unit 139 that constitutes the drive mechanism of the electric zoom function. A motor unit 144 provided with a lead screw 143 as an actuator is attached to the upper surface of the hood 142, which is a structure of the light emitting unit 139. The reflector holder 145 is attached with a discharge tube 102, a reflector 146 that reflects the light of the discharge tube 102 forward, and a front glass 154 that blocks heat transmitted from the discharge tube 102 to the Fresnel lens 140. The reflecting umbrella 146 covers from the upper side to the lower side of the discharge tube 102, and reflects the light emitted from the discharge tube 102 in the rear and vertical directions toward the Fresnel lens 140. The reflective umbrella holder 145 changes the relative distance between the Fresnel lens 140 and the discharge tube 102 in conjunction with the rotation of the lead screw 143. As a result, the light distribution angle of the irradiation light changes. In the present embodiment, a strobe device having a configuration in which the distance between the discharge tube 102 and the reflecting umbrella 146 with respect to the Fresnel lens 140 is changed to change the light distribution angle of the irradiation light is used. However, the light distribution angle of the irradiation light may be changed by changing the distance between the upper and lower reflecting surfaces of the reflecting umbrella 146. The hood 142 diffusely reflects the light that was not reflected by the reflecting umbrella 146 in the irradiation direction of the light emitting unit 139 in the irradiation direction of the light emitting unit 139. Therefore, the hood 142 has a shape in which the opening in the plane orthogonal to the optical axis of the irradiation light of the light emitting unit 139 becomes larger as it approaches the Fresnel lens 140 so that the light can be efficiently reflected in the irradiation direction of the light emitting unit 139. ing. As described above, the hood 142 can be said to be a reflective member that surrounds the discharge tube 102 so as to have an opening in a part thereof and reflects a part of the light emitted from the discharge tube 102 in the direction of the opening.

A head substrate 148 connected to the discharge tube 102 is attached to the back surface (bounce case 105 side) of the hood 142. The wiring (not shown) connected to the head substrate 148 is guided to the capacitor housing portion 105b through the rotating portion 149 between the upper cover 103 and the bounce case 105 whose rotation center is the center of the cylinder of the bounce case 105. These wires form a wire harness 127 together with the wires connected to the capacitor 147. The wire harness 127 is pulled out from the hole 105c formed in the center of the shaft 105a to the outside of the light emitting portion 100a. A connector (not shown) is attached to the tip of the wire harness 127. This connector electrically connects the circuit of the head substrate 148 provided inside the light emitting unit 100a with the main substrate 128 and the sub substrate 129 provided inside the control unit 100b. In this way, the wire harness 127 electrically connects electronic components such as the discharge tube 102 and the capacitor 147 provided in the light emitting unit 100a with each control board provided in the control unit 100b. Further, a rotating plate 150 is attached to the tip of the shaft portion 105a of the bounce case 105, and has a role of restricting the left-right turning of the light emitting portion 100a at a predetermined angle. Further, the rotating plate 150 has a role of preventing the light emitting unit 100a from coming off from the control unit 100b.

A capacitor 147 (main capacitor) is arranged in the capacitor storage portion 105b inside the bounce case 105 having a cylindrical shape. That is, the capacitor 147 is arranged on the rotation axis when the light emitting unit 100a is rotated in the vertical direction (Y direction) relative to the control unit 100b. Further, the capacitor 147 is arranged near the connecting portion between the light emitting unit 100a and the control unit 100b. The capacitor 147 stores an electric charge for causing the discharge tube 102 to emit light. The accumulated charge generates a high voltage required for light emission of the discharge tube 102.

The discharge tube 102 starts discharging when a trigger voltage is applied from the trigger coil 151 and emits light. The trigger coil 151 is mounted on the head substrate 148 and is electrically connected to the reflecting umbrella 146 by a trigger cable (not shown). The trigger voltage is applied from the trigger coil 151 to the discharge tube 102 via the reflector 146. On the head substrate 148, components related to light emission such as a trigger coil 151 and a choke coil 152 constituting a light emitting circuit are mounted. Further, a connector 153 for connecting the wire harness 127 is also mounted on the head substrate 148. The choke coil 152 is electrically connected between the capacitor 147 and the discharge tube 102 to blunt the current supplied from the capacitor 147 to the discharge tube 102. This enables light emission control during flat light emission and reduces the electrical load acting on the discharge tube 102.

The protective glass 141 emits light emitted from the discharge tube 102, which is arranged between the discharge tube 102 and the Fresnel lens 140 with a predetermined width with respect to the Fresnel lens 140 in the direction of the irradiation optical axis of the strobe device 100. It is an optical member that transmits light. Further, even if the relative positions of the discharge tube 102 and the Fresnel lens 140 in the irradiation optical axis direction change with the electric zoom, the relative positions (distances) of the protective glass 141 and the Fresnel lens 140 in the irradiation optical axis direction change. do not. As a result, the Fresnel lens 140 is protected from the heat of the discharge tube 102 generated by light emission, and the space between the Fresnel lens 140 and the protective glass 141 forms a flow path 156 through which the air from the blower fan 155 described later is passed. By the way, the windshield 154 described above also has the same function as the protective glass 141 in that the Fresnel lens 140 is protected by blocking the heat transferred from the discharge tube 102 to the Fresnel lens 140. However, if the space including the discharge tube 102 is sealed by the windshield 154 and the reflective umbrella holder 145, the heat from the discharge tube 102 is trapped in the space. Therefore, the reflective umbrella holder 145 may be provided with an opening. Alternatively, since the Fresnel lens 140 is protected from the heat of the discharge tube 102 generated by light emission from the protective glass 141, the windshield 154 may not be provided. The protective glass 141 may have an optical action of adjusting the light distribution of the incident light emitted from the discharge tube 102, but when the lens portion is formed on the surface on the Fresnel lens 140 side, the Fresnel lens 140 and the protective glass 141 It may block the flow of air to and from the protective glass 141. Therefore, when the lens portion is formed on the protective glass 141, the discharge tube 102 side is preferable to the Fresnel lens 140 side.

The blower fan 155 is arranged in the fan storage portion 104a of the lower cover 104 and is thermally connected to the lower cover 104. Further, it is electrically connected to the head substrate 148 by a wire harness (not shown). The drive of the blower fan 155 is rotationally controlled by a PWM signal by the CPU 130 of the control unit 100b via the head substrate 148. The intake portion 155a of the blower fan 155 is provided in a space closer to the light emitting unit 139 than the protective glass 141, and takes in the air heated by the discharge tube 102. After that, air is blown from the exhaust portion 155b (blower port) of the blower fan 155 toward the flow path 156, which is a space formed by the Fresnel lens 140 and the protective glass 141. The air that has passed through the flow path 156 is discharged to the motor unit 144 side and flows into the light emitting unit 139. As described above, the blower fan 155 allows air in the internal space (first space) including the light source on the light source side of the protective glass 141 to flow into the space (second space) between the Fresnel lens 140 and the protective glass 141. ).

Next, the cooling structure of the light emitting unit 100a in the present embodiment will be described with reference to FIGS. 5 to 9. FIG. 5 shows a configuration in which the blower fan 155 is mounted on the fan storage portion 104a of the lower cover 104. FIG. 6 shows the configuration of the outflow port 103e to the upper cover 103 when discharged from the flow path 156. FIG. 7 is a front view of the discharge tube 102 and the blower fan 155. FIG. 8 shows the air vent 142a and the vent 142b of the hood 142. FIG. 9 shows the main air flow with arrows in the cross-sectional perspective view of the light emitting unit 100a. FIG. 10 is a diagram showing the main air flow shown by arrows on the cross-sectional curve of FIG. In the following description, in order to further improve the cooling efficiency of the discharge tube 102, the windshield 154 will be removed.

A blower fan 155 is fixed to the fan storage portion 104a of the lower cover 104 via an elastic member (not shown) for the purpose of absorbing vibration or the like. The blower fan 155 is thermally connected to the lower cover 104, and when the air heated by the light emitted from the discharge tube 102 is sucked, the heat is transferred to the lower cover 104 to cool the sucked air. Since the lower cover 104 is in contact with the outside air, the transmitted heat can be dissipated to the outside air to efficiently cool the intake air. In the blower fan 155, the head substrate 148 in the light emitting unit 100a and the fan drive substrate 155c are electrically connected by a wire harness (not shown), and the blower fan 155 is driven by a power supply and a drive control signal. The blower fan 155 takes in the air heated by the light emission of the discharge pipe 102 from the intake unit 155a by rotating the blade 155d at high speed, increases the flow velocity, and blows air from the exhaust unit 155b.

The acrylic panel 101 is fixed to the groove 103b of the upper cover 103 and the groove 104b of the lower cover 104, and the Fresnel lens 140 is fixed to the groove 103c of the upper cover 103 and the groove 104c of the lower cover 104, respectively. Further, the protective glass 141 is fixed so as to be sandwiched between the upper cover 103 and the lower cover 104 via the shock absorbing member 157 attached to both the upper cover 103 and the lower cover 104. The front-rear direction (Z direction) is sandwiched between the rib 103d, the rib 104d, and the hood 142 for forming the groove 103c and the groove 104c. As a result, the protective glass 141 is fixed with a predetermined width from the Fresnel lens 140 according to the thickness of the rib 103d and the rib 104d, and the flow path 156 is formed.

As shown in FIG. 9, the air blown from the exhaust portion 155b flows while changing the traveling direction from the front direction (Z direction) to the upward direction (Y direction) by the inflow port 104e formed in the lower cover 104. It flows into the road 156. That is, the blower fan 155 and the inflow port 104e allow air in the internal space (first space) including the light source on the light source side of the protective glass 141 to flow in the space (second space) between the Fresnel lens 140 and the protective glass 141. It functions as a ventilation mechanism to send to the space). If the blower fan 155 and the inflow port 104e are separated from each other and the flow path connecting the blower fan 155 and the inflow port 104e is provided in the lower cover 104, the blower fan 155, the inflow port 104e, and the flow port are provided. The path functions as a blower mechanism.

As shown in FIG. 10, when passing through the flow path 156, the heat transferred from the discharge tube 102 to the Fresnel lens 140 through the protective glass 141 can be effectively cooled by passing through the flow path 156 while maintaining the flow velocity. Even if the blower fan 155 takes in the air heated by the light emitted from the discharge tube 102, the lower cover 104 can dissipate heat as described above. Further, the temperature of the Fresnel lens 140 heated by the heat and light of the discharge tube 102 is often higher than that of the air blown from the blower fan 155, and the temperature of the Fresnel lens 140 and the air blown from the blower fan 155 is different. The temperature difference is large enough to cool. Further, by bending the air flow blown from the blower fan 155 so as to be substantially orthogonal to each other, the configuration of the entire light emitting unit 100a can be reduced.

Here, it is desirable that the width of the space forming the flow path 156 (width in the Z direction) is substantially equal to the opening width in the vertical direction (Y direction) of the exhaust portion 155b of the blower fan 155. If the width of the space forming the flow path 156 (width in the Z direction) is extremely narrow with respect to the opening width in the vertical direction (Y direction) of the exhaust portion 155b, the flow path resistance becomes large and it becomes difficult for air to flow. .. On the other hand, when the width of the space forming the flow path 156 is extremely wide, the cross-sectional area of the flow path becomes large and the flow velocity is lost. Therefore, the above configuration is preferable to the configuration in which the air in the flow path 156 is taken in by the blower fan 155 and exhausted to the space on the light emitting unit 139 side rather than the protective glass 141.

Further, the Fresnel lens 140 and the protective glass 141 do not necessarily have to be arranged in parallel. For example, the width of the inflow side of the flow path 156 is made substantially equal to the opening width of the exhaust portion 155b in the vertical direction (Y direction), and the width is gradually narrowed toward the outflow side to minimize the flow path resistance at the time of inflow. At the same time, the flow velocity can be maintained until the outflow. Further, as shown in FIG. 7, the longitudinal direction (X direction) of the discharge pipe 102 and the longitudinal direction (X direction) of the exhaust portion 155b of the blower fan 155 are the same direction, and the length of the discharge pipe 102 and the exhaust portion It is desirable that the lengths of 155b in the longitudinal direction (X direction) are substantially the same. By doing so, the range near the arc length of the discharge tube 102, where the Fresnel lens 140 is most heated, can be efficiently cooled.

The air flowing out from the flow path 156 flows out to the outflow path 103a by the outflow port 103e formed in the upper cover 103 while changing the traveling direction from the upward direction (Y direction) to the rear direction (Z direction). The air flowing out to the outflow passage 103a passes through the vents 142a and 142b provided in the vertical direction (Y direction) of the hood 142, absorbs the heat of the discharge pipe 102 again, and is taken into the blower fan 155. ..

By cooling the discharge tube 102 and the Fresnel lens 140 while circulating air inside as described above, it is possible to protect the discharge tube 102 and the Fresnel lens 140. Further, in the above-mentioned configuration, since the air is circulated inside the closed space, the configuration can be achieved even while having the dust-proof and drip-proof performance.

In the present embodiment, the ventilation mechanism is arranged on one side (lower side) sandwiching the discharge tube 102, and the light distribution of the light emitted from the Fresnel lens 140 is changed on the other side (upper side) sandwiching the discharge tube 102. A storage unit is arranged to store the wide panel 108 for storing the wide panel 108 so that it can be taken in and out. That is, the blower fan 155 arranged below the light emitting unit 100a is configured to allow air to flow upward (Y direction) through the flow path 156. However, the blower fan 155 may be arranged on the left side (or right side) of the light emitting unit 100a so that the air flows in the flow path 156 in the right direction (X direction) (or in the left direction (−X direction)). .. In that case, the inflow port 104e, the outflow port 103e, the outflow path 103a, the vent 142a, and the vent 142b are also arranged in the left-right direction (X direction), respectively. However, in the configuration shown in the present embodiment (a configuration in which air flows upward (Y direction) through the flow path 156), the flow path 156 can be set shorter, so that the flow velocity can be easily maintained and the cooling effect is higher.

As described above, according to the present embodiment, it is possible to protect the members involved in light emission such as the discharge tube 102 and the Fresnel lens 140 from the heat associated with light emission.

(Second Embodiment)
Hereinafter, the configuration of the strobe device 200, which is the lighting device according to the second embodiment of the present invention, will be described with reference to FIGS. 11 and 12. In the lighting device of the present embodiment, the same ones as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The present embodiment is different from the first embodiment in that the intake port 201 and the exhaust port 202 are provided, and the cooling effect is enhanced by performing intake and exhaust to the outside of the strobe device 200. FIG. 11 is a cross-sectional view showing a cross section orthogonal to the left-right direction of the light emitting unit 100a in the strobe device 200. FIG. 12 is a cross-sectional perspective view of the light emitting unit 100a showing the main air flow indicated by arrows.

Unlike the first embodiment, the upper cover 203 is provided with an intake port 201 and an exhaust port 202, and the intake port 201 and the exhaust port 202 are separated by a separator 204. A ventilation port 205a is provided behind the hood 205 (on the side of the condenser 147), and as shown in FIG. 12, the outside air entering from the intake port 201 is guided into the hood 205. The blower fan 155 takes in the air heated by the discharge pipe 102 from the intake portion 155a, dissipates the heat to the thermally connected lower cover 104, and changes the traveling direction from the exhaust portion 155b at the inflow port 104e to change the traveling direction of the flow path 156. Blow to. The air flowing out from the flow path 156 passes through the outflow path 203a surrounded by the upper cover 203 and the separator 204 while changing the traveling direction at the outflow port 203e formed in the upper cover 203, and is strobe from the exhaust port 202. It is exhausted to the outside of the device 200.

As described above, by taking in the outside air from the intake port 201 and exhausting the air heated inside the strobe device 200 from the exhaust port 202, the heat generated by the light emission is converted into light emission from the discharge tube 102, the Fresnel lens 140, and the like. It is possible to protect the members involved.

As described above, in the present embodiment, the outside air is taken directly into the light emitting unit 100a to effectively cool the discharge tube 102, and the heated air is exhausted from the exhaust port 202 to emit the light emitting unit. The temperature rise of the entire 100a can be suppressed.

(Third Embodiment)
Hereinafter, the configuration of the strobe device 300, which is the lighting device according to the third embodiment of the present invention, will be described with reference to FIGS. 13 to 15. In the lighting device of the present embodiment, the same ones as those of the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted. The present embodiment is different from the first embodiment and the second embodiment in that the heat radiating fins 301 and the exhaust blower fan 305 are provided to further enhance the cooling effect. FIG. 13 is a cross-sectional view showing a cross section orthogonal to the left-right direction of the light emitting unit 100a in the strobe device 300. FIG. 14 shows the main air flow with arrows in the cross-sectional perspective view of the light emitting unit 100a. FIG. 15 is a perspective view showing the heat radiation fins 301 when the light emitting unit 100a is viewed from the lower surface side.

The upper cover 303 is provided with an intake port 201 and an exhaust hole 302, and the intake port 201 and the exhaust hole 302 are separated by a separator 204. A ventilation port 205a is provided behind the hood 205 (on the side of the condenser 147), and as shown in FIG. 14, the outside air entering from the intake port 201 is guided into the hood 205. The blower fan 155 takes in the air heated by the discharge pipe 102 from the intake unit 155a, and dissipates the air taken in by the heat radiating fins 301 thermally connected to the blower fan 155. Then, the air is blown from the exhaust unit 155b to the flow path 156 by changing the traveling direction at the inflow port 304e.

As shown in FIG. 15, the heat radiating fin 301 is a heat radiating portion in which a fin shape is formed by die casting or the like, and is insert-molded into the lower cover 304. The fin shape is such that it protrudes to the outside of the lower cover 304 and a groove is cut in the vertical direction (Y direction) so as not to obstruct the air flow in the vertical direction (Y direction). With such a configuration, the air taken into the blower fan 155 can be efficiently radiated, and the efficiently radiated air can be blown to the flow path 156 to increase the heat dissipation efficiency of the Fresnel lens 140. The heat radiation fin 301 and the lower cover 304 may be made into separate parts and incorporated.

The air flowing out from the flow path 156 flows into the outflow path 303a surrounded by the upper cover 303 and the separator 204 while changing the traveling direction at the outflow port 303e formed in the upper cover 303. The air that has flowed into the outflow passage 303a is taken in by the exhaust blower fan 305 from the intake portion 305a connected to the exhaust hole 302 formed above (Y direction) of the outflow passage 303a. The exhaust blower fan 305 is similar to the blower fan 155, but unlike the first and second embodiments, it is housed inside the wide panel cover 106 instead of the wide panel 108. Further, it is electrically connected to the head substrate 148 by a wire harness (not shown). The drive of the exhaust blower fan 305 is rotationally controlled by the CPU 130 of the control unit 100b via the head substrate 148 as in the blower fan 155 by the PWM signal. The intake portion 305a of the exhaust blower fan 305 is provided on the light emitting unit 139 side, and the air heated by passing through the flow path 156 is taken in from the exhaust hole 302. The air taken in from the intake unit 305a is exhausted outward from the exhaust unit 305b to the strobe device 300 in the same direction (Z direction) as the irradiation direction. As described above, the outlet 303e, the outflow passage 303a, and the exhaust blower fan 305 serve as a second blowing mechanism for sending the air flowing through the space between the Fresnel lens 140 and the protective glass 141 to the outside of the strobe device 300. Function.

As described above, the heated air in the vicinity of the discharge tube 102 is taken in by the blower fan 155 and radiated by the heat radiating fins 301, and the air that has absorbed the heat of the Fresnel lens 140 is exhausted by the blower fan 305. Exhaust to the outside of 300. Therefore, it is possible to protect members related to light emission such as the discharge tube 102 and the Fresnel lens 140 from the heat generated by light emission.

As described above, in the present embodiment, the cooling effect of the Fresnel lens 140 can be enhanced by blowing the air radiated by the radiating fins 301 to the flow path 156. Further, by providing the blower fan 155 and the exhaust blower fan 305, the air in the light emitting unit 100a can be further circulated and the heat dissipation effect can be increased to enhance the cooling effect.

(Fourth Embodiment)
Hereinafter, the configuration of the strobe device 400, which is the lighting device according to the fourth embodiment of the present invention, will be described with reference to FIG. In the lighting device of the present embodiment, the same ones as those of the first to third embodiments are designated by the same reference numerals and the description thereof will be omitted. The present embodiment includes an LED 401 that can be used as a modeling light for confirming composition, a video light for shooting a moving image, an AF auxiliary light, and the like. Then, the LED heat radiating unit 402 that dissipates the heat of the LED 401 forms the flow path 403 from the blower fan 155 to the flow path 156. This is different from the first to third embodiments in that the heat transferred to the Fresnel lens 140 and the LED heat radiating unit 402 can be cooled at the same time. FIG. 16 is a cross-sectional view showing a cross section orthogonal to the left-right direction of the light emitting unit 100a in the strobe device 400.

The strobe device 400 of the present embodiment has a configuration in which air circulates inside, like the strobe device 100 of the first embodiment.

The LED 401 is arranged below the hood 404 and mounted on the LED substrate 405. The LED substrate 405 is positioned and fixed to the LED heat radiating portion 402, and is thermally connected via a heat conductive material such as grease. The LED substrate 405 is preferably an aluminum substrate or the like having excellent heat transfer properties.

The LED heat radiating unit 402 is a heat conductive material having excellent heat transfer properties such as aluminum die casting, and prepares the air blown from the blower fan 155 to form the upper surface and the side surface of the flow path 403 leading to the flow path 156. Details of the flow path 403 will be described later.

The LED lens 406 is arranged below the hood 404 like the LED 401, and is positioned with respect to the hood 404 together with the LED heat radiating portion 402. As a result, the LED optical axes of the LED 401 and the LED lens 406 are aligned.

The protective glass 407 is shorter in the vertical direction (Y direction) than the acrylic panel 101 and the Fresnel lens 140, and the upper portion is cut out within a range that can cover the effective range of light rays from the discharge tube 102. As a result, the air flowing through the flow path 156 can flow out from the upper part of the protective glass 407 to the hood 404.

The air layer 408 is an air layer formed between the acrylic panel 101 and the Fresnel lens 140, and is provided to suppress the temperature rise of the acrylic panel 101. The acrylic panel 101 and the Fresnel lens 140 are fixed by the upper cover 409 and the lower cover 410, and determine the thickness of the air layer 408.

The choke coil 413 is arranged in the choke coil accommodating portion 414 in the bounce case 105, and is electrically connected to the head substrate 148 by a wire harness (not shown) via a coil fixing substrate 415. Further, in order to prevent vibration when a current flows through the choke coil 413, the choke coil 413 is fixed to the capacitor 147 or the choke coil accommodating portion 414. Unlike the first to third embodiments, by arranging the choke coil 413 in the choke coil accommodating portion 414, the mounting area of the head substrate 148 can be secured and the size can be reduced.

Next, the cooling structure of the light emitting unit 100a in the present embodiment will be described with reference to FIGS. 17 and 18. FIG. 17 shows the main air flow with arrows in the cross-sectional perspective view of the light emitting unit 100a. FIG. 18 is a perspective view showing the flow path 403 in the light emitting unit 100a.

A blower fan 155 is fixed to the fan storage portion 104a of the lower cover 410 by using a screw or the like to provide a gap with the lower cover 410. The blower fan 155 takes in the air heated by the light emission of the discharge pipe 102 from the intake unit 155a from both the vertical direction (Y direction) of the blower fan 155, increases the flow velocity, and blows the air from the exhaust unit 155b. The air blown from the exhaust unit 155b is rectified in the flow path 403, and first changes the traveling direction from the front downward direction (−YZ direction) to the front direction (Z direction). After that, the inflow port 104e formed in the lower cover 410 flows into the flow path 156 while changing the traveling direction from the front direction (Z direction) to the upward direction (Y direction). As a result, the flow path resistance can be minimized while the blowing direction from the exhaust portion 155b and the traveling direction of the flow path 156 are acute angles.

The flow path 403 is configured to be surrounded by a flow path upper surface 402a and a straightening vane 402b integrally molded with the LED heat radiating portion 402, and a lower cover 410. The upper surface of the flow path 402a is inclined so that the height in the vertical direction is narrowed so that it can be smoothly connected to the inflow port 104e. The rectifying plate 402b has the effect of regulating the flow of air blown from the exhaust unit 155b in the centrifugal direction of the blower fan 155 in the left-right direction and rectifying the air flow. In FIG. 18, the rectifying plates 402b are arranged only on the left and right sides of the flow path 403, but the rectifying effect may be enhanced by arranging a plurality of rectifying plates 402b in the flow path 403.

By integrally molding the upper surface of the flow path 402a and the straightening vane 402b with the LED heat radiating portion 402, the heat of the LED 401 can also be cooled through the LED heat radiating portion 402 by the air blown from the blower fan 155. Even if the air to be blown is warmed by the LED heat radiating unit 402, the heat received from the discharge tube 102 to the Fresnel lens 140 is larger and there is a sufficient temperature difference, so that the cooling of the Fresnel lens 140 is greatly affected. No.

The air that has cooled the Fresnel lens 140 in the flow path 156 flows out into the hood 404 through a gap due to a notch in the upper part of the protective glass 407. The air flowing out to the inside of the hood 404 passes through the vent 142b at the bottom of the hood 404 and is taken into the blower fan 155 again while taking heat from the discharge pipe 102 and its surroundings inside the hood 404.

As described above, the LED radiator portion 402 forms a part of the flow path 403 to cool the LED 401 while cooling the discharge tube 102 and the Fresnel lens 140 to protect the discharge tube 102, the Fresnel lens 140, and the LED 401, respectively. It is possible to do. Further, since the configuration is such that the air is circulated inside the closed space as in the first embodiment, the configuration can be achieved even while having the dust-proof and drip-proof performance.

As described above, in the present embodiment, the LED 401, the discharge tube 102, and the Fresnel lens 140 can be simultaneously cooled by the air blown from the blower fan 155 via the LED heat radiating unit 402.

It should be noted that each of the above embodiments is merely an example and is only a representative example. In carrying out the present invention, various modifications, changes and omissions can be made to each embodiment, and each embodiment can be modified or omitted. May be combined. For example, the heat radiating fins 301 of the third embodiment may be combined with the configuration of the first embodiment.

Further, in each of the above embodiments, the configuration in which the discharge tube is used as the light source of the lighting device has been described, but the light source of the lighting device may be an LED or the like.

Further, in each of the above embodiments, a configuration using a fan for intake and ventilation has been described, but a pump or the like may be used as long as it is a ventilation mechanism capable of intake and ventilation.

100 Strobe device 100a Light emitting unit 100b Control unit 102 Discharge tube 139 Light emitting unit 140 Fresnel lens 141 Protective glass 155 Blower fan 156 Flow path 201 Intake port 202 Exhaust port 301 Heat dissipation fin 305 Blower fan for exhaust 401 LED
402 LED heat dissipation part 403 Flow path

Claims (13)

A light source with a discharge tube and
A first optical member that transmits light emitted by the light source,
A second optical member arranged between the light source and the first optical member, which transmits the light emitted by the light source, and
A first space, which is an internal space including the light source, and a second space, which is a space between the first optical member and the second optical member, provide a blowing mechanism for moving air. a Yes to the lighting device,
The ventilation mechanism has a fan, and the fan has a fan in a first direction parallel to the irradiation light axis direction of the lighting device and a third direction orthogonal to a second direction parallel to the longitudinal direction of the light source. An illuminating device that is arranged at a position alongside a light source and has a width in the third direction smaller than a width in the first direction. The lighting device according to claim 1, wherein the first optical member is an optical lens that changes the light distribution of light emitted from the light source. The lighting device according to claim 1 or 2, wherein the second optical member is arranged with a predetermined width apart from the first optical member in the first direction. It has a drive mechanism that changes the relative position of the light source and the first optical member in the first direction.
Even if the relative positions of the light source and the first optical member in the first direction are changed by the drive mechanism, the first optical member and the second optical member are in the first direction. The lighting device according to any one of claims 1 to 3, wherein the relative position does not change. The lighting device according to any one of claims 1 to 4, wherein the air sent to the second space by the blowing mechanism flows in the third direction. The lighting device according to any one of claims 1 to 5, wherein the longitudinal direction of the blower port of the blower mechanism is arranged so as to be the second direction. The lighting device according to any one of claims 1 to 6, wherein the air flowing through the second space is discharged to the first space. Any one of claims 1 to 6, wherein the air flowing through the second space is discharged to the outside of the lighting device through a flow path provided along the second space. Lighting equipment as described in the section. The lighting device according to claim 8, further comprising a second blowing mechanism that sends air flowing through the second space to the outside of the lighting device. The lighting device according to any one of claims 1 to 9, further comprising a heat radiating portion thermally connected to the blower mechanism. The lighting device according to any one of claims 1 to 10, wherein the blowing mechanism has a blower fan. The ventilation mechanism is arranged on one side of the light source, and a third optical member for changing the light distribution of the light emitted from the first optical member is housed on the other side of the light source so that it can be taken in and out. The lighting device according to any one of claims 1 to 11, wherein the storage unit is arranged. LED and
The LED board on which the LED is mounted and
It has an LED heat radiating unit that is thermally connected to the substrate.
The lighting device according to any one of claims 1 to 12, wherein the air flow path sent from the ventilation mechanism is formed by using a part of the LED heat radiating portion.

Images