JP5968027B2 - Light emitting device - Google Patents

Description

  The present invention relates to a light emitting device that emits flash light, for example, a light emitting device mounted on an imaging device such as a digital camera or a digital video camera.

  In recent years, strobe devices tend to have a larger circuit scale and a larger space occupied by circuit boards due to demands for multi-functionality, while space-efficient arrangement of electrical components and circuit boards due to demands for miniaturization. Is also becoming an important issue.

  Against this background, a technique has been proposed in which electric components can be arranged efficiently in a space without creating a useless space inside the main body of the strobe device (Patent Document 1).

  As shown in FIG. 8, in the strobe device, cylindrical electric components 176 and 177 are arranged in a space surrounded by the circuit board 131, the battery case 132, and the main capacitor 138 inside the device main body 101.

  The cylindrical electric components 176 and 177 are arranged along the notches 131a and 131b formed in the circuit board 131. This makes it possible to arrange the electric components in a space efficient manner and reduce the size of the strobe device. .

JP 2010-181552 A

  By the way, in the strobe device, further downsizing and multi-functionality are required, and the space of the battery housing part that is difficult to miniaturize becomes relatively large. On the other hand, electrical parts and circuit board parts are used for multi-functionality. The number of points has increased, and the space for arranging these has become extremely small. For this reason, along with the miniaturization, noise from the light emitting unit easily gets on the communication line of the control IC, and a communication error is likely to occur and malfunction such as failure to emit light with an appropriate light emission amount is likely to occur.

  Therefore, the present invention provides a mechanism that realizes downsizing and multi-functionalization of a light-emitting device by arranging electrical components and a circuit board in a space-efficient manner so as to reduce malfunction due to noise from the light-emitting portion. The purpose is to do.

In order to achieve the above object, a light-emitting device of the present invention includes a light-emitting unit, and a main substrate arranged along a direction intersecting the irradiation surface of the light-emitting unit on the back side of the light-emitting unit. The main board is mounted with a first circuit including a booster circuit, a second circuit including a high voltage circuit for causing the light emitting unit to emit light, and a third circuit including a digital control circuit. The third circuit is disposed at a position farther from the light emitting unit than the first circuit and the second circuit.

  According to the present invention, the electrical components and the circuit board can be arranged in a space-efficient manner so as to reduce malfunction due to noise from the light-emitting portion, so that the light-emitting device can be reduced in size and multifunction. .

(A) is the external appearance perspective view of the strobe device which is the 1st Embodiment of this invention, (b) is the external appearance perspective view which looked at the strobe device shown to (a) from the back side. 1A is an exploded perspective view of the strobe device shown in FIG. 1A, and FIG. 1B is an exploded perspective view of the strobe device shown in FIG. It is the perspective view which looked at the internal structure of the apparatus main body of the strobe device from the side facing the upper cover. It is the perspective view which looked at the internal structure of the apparatus main body of the strobe device from the side facing the lower cover. It is the perspective view which looked at the main board | substrate from the surface side which faces a direction with an upper cover. It is a disassembled perspective view of a light emission part. It is the top view which looked at the main board | substrate in the strobe device which is the 2nd Embodiment of this invention from the surface side which faces a direction with a lower cover. It is a schematic perspective view for demonstrating the conventional strobe device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1A is an external perspective view of a strobe device as a light emitting device according to a first embodiment of the present invention, and FIG. 1B is an external perspective view of the strobe device shown in FIG. FIG. 2A is an exploded perspective view of FIG. 1A, and FIG. 2B is an exploded perspective view of FIG. 1B. In the present embodiment, a strobe device that is detachably attached to an imaging device such as a digital camera is taken as an example.

  As shown in FIGS. 1 and 2, the strobe device of the present embodiment includes a device main body 1 and a leg portion 7 attached to the bottom of the device main body 1, and the leg portion 7 is attached to an accessory shoe on the camera side. Can be attached and detached.

  The apparatus main body 1 has an outer cover formed by an upper cover 2 and a lower cover 3, and the above-described legs 7 are attached to the bottom surface of the lower cover 3, and an end of the lower cover 3 on the back side of the apparatus main body 1. A lock switch 8 and a power button 5 are provided to prevent the camera from falling off.

  Inside the apparatus main body 1 are disposed a main substrate 31, a battery 21, terminals for communication with the camera, a shoe flexible printed circuit board 41 on which a circuit for controlling communication with the camera side accessory shoe is mounted. Yes. The shoe flexible printed circuit board 41 is electrically connected to a connector 42 (see FIG. 4) mounted on the main board 31. In addition, a light emitting unit 4 that emits strobe light is provided at the front side (subject side) end of the apparatus main body 1, and a battery lid 6 is provided at the back side end of the apparatus main body 1 so that it can be opened and closed. It has been.

  The main body 1 of the strobe device has a shape in which the end on the light emitting unit 4 side is inclined upward with respect to the mounting surface to the camera. The inclination of the apparatus body 1 is for reducing the total thickness of the strobe device and improving the portability. In addition, the height of the light emitting unit 4 when the strobe device is attached to the camera needs to be high enough not to cause vignetting of the photographing lens of the camera.

  For example, when the apparatus main body 1 is arranged horizontally with respect to the mounting surface to the camera, it is necessary to extend the leg portion 7 in order to secure the height, and as a result, the total thickness of the strobe device increases. , The portability of the strobe device alone becomes worse.

  The strobe device according to the present embodiment is a small strobe device having extremely excellent portability even when the strobe device is a single unit or attached to a camera by making the main body 1 tilted. It has become.

  Next, the internal structure of the apparatus body 1 of the strobe device will be described in further detail with reference to FIGS. 3 is a perspective view of the internal structure of the apparatus main body 1 as viewed from the side (upper surface side) facing the upper cover 2, and FIG. 4 is the side (lower surface side) of the internal structure of the apparatus main body 1 facing the lower cover 3. It is the perspective view seen from. FIG. 5 is a perspective view of the main board 31 as viewed from the side facing the direction in which the upper cover 2 is located, and FIG. 6 is an exploded perspective view of the light emitting unit 4.

  As shown in FIGS. 3 and 4, the battery case 15 includes a cylindrical battery storage portion 15 a that stores two batteries 21. Battery contact pieces 36 and 37 are held at the end of the battery case 15 on the light emitting portion 4 side, and the terminal portions 36a and 37a of the battery contact pieces 36 and 37 are fixed to the main substrate 31 by soldering or the like.

  At the end of the battery case 15 on the battery lid 6 side, a power flexible printed circuit board 38 on which a detection switch for detecting the on / off state of the power button 5 is mounted is disposed. The power supply flexible printed board 38 is electrically connected to a connector 39 mounted on the main board 31.

  The main substrate 31 is disposed along the direction intersecting the strobe light irradiation surface (panel surface of the Fresnel panel 9 described later) of the light emitting unit 4 on the back side of the light emitting unit 4, and on the lower surface side of the battery case 15. It is fixed with screws.

  The main substrate 31 includes a first strobe circuit 31a (first circuit) including a step-up transformer 40, a DC-DC circuit, a step-up circuit, and the like. The main board 31 has a second strobe circuit 31 b (second circuit) including a high voltage circuit that causes the light emitting unit 4 to emit light with the energy of the main capacitor 35 charged from the battery 21. Further, the main board 31 has a third strobe circuit 31c (third circuit) including a digital control circuit on which a power switch, a control CPU 32, and a light receiving sensor IC 33 are mounted.

  With the above configuration, the main board 31 has the first strobe circuit 31a, the second strobe circuit 31b, and the third strobe circuit 31c at the end closer to the light emitting unit 4 than the end far from the light emitting unit 4. It can be said that it is inclined in the direction of the mounting surface.

  The first strobe circuit 31a and the second strobe circuit 31b are arranged close to each other so that the connection distance to the lead wires 16 to 19 drawn from the light emitting unit 4 is as short as possible in order to improve electrical efficiency. And disposed close to the back surface of the light emitting unit 4.

  Generally, when electrical noise generated from the light emitting unit during strobe light emission gets on the communication line of the control IC, a communication error may occur, resulting in malfunction such as failure to emit light with an appropriate light emission amount. In the present embodiment, the third strobe circuit 31c on which the control CPU 32 and the light receiving sensor IC 33 are mounted is replaced with the first strobe circuit 31a and the second strobe circuit in order to prevent malfunction due to noise from the light emitting unit that occurs during strobe light emission. It is arranged at a position further away from the light emitting unit 4 than 31b.

  Here, the battery case 15 is disposed on a surface (upper surface) facing the direction in which the upper cover 2 of the main board 31 is located, and the first strobe circuit 31a, the second strobe circuit 31b, and the third strobe circuit 31c are arranged on the main board. The lower cover 3 is disposed on a surface (lower surface) facing a direction.

  A part of the upper surface of the main substrate 31 is opposed to the battery case 15, and a cylindrical main capacitor 35 is disposed on the upper surface of the main substrate 31 so that the longitudinal direction thereof is substantially parallel to the insertion / extraction direction of the battery 21 with respect to the battery case 15. Is provided. Therefore, the longitudinal direction of the main substrate 31 is substantially parallel to the longitudinal direction of the main capacitor 35. The main capacitor 35 accumulates electric charges for light emission charged from the battery 21 and performs charge / discharge during strobe light emission.

  The terminal portion 35a of the main capacitor 35 is fixed to the main substrate 31 by soldering or the like at a position close to the terminal portions 36a, 37a of the battery contact pieces 36, 37. Thereby, the electrical path | route between the main capacitor | condenser 35 and the battery contact pieces 36 and 37 can be shortened, and an electrical loss can be suppressed.

  Here, in the present embodiment, a storage space for a plurality of electrical components (see FIG. 5) mounted on the upper surface of the main board 31 is formed between the main board 31 and the battery case 15.

  The plurality of electric components mounted on the upper surface of the main substrate 31 are electric components having a smaller volume than the control CPU 32 and the light receiving sensor IC 33 mounted on the lower surface of the main substrate 31. As a result, a plurality of electrical components can be arranged in a space efficient manner without creating a useless space inside the apparatus body 1.

  The light receiving sensor IC 33 is a sensor that receives light guided from the light emitting unit 4 via the glass fiber cable 20 and is covered with a light receiving sensor holding member 34 in order to shield it from the outside. The light receiving sensor holding member 34 is integrally provided with a main body 34a, a strobe light emitting portion 34b, and a mounting portion 34c.

  The main body 34 a is fitted so as to cover the entire light receiving sensor IC 33 and shields the light receiving sensor IC 33 from the outside. The strobe light emitting portion 34b holds the end 20b of the glass fiber cable 20 via an adhesive or the like. The attachment portion 34c is fixed to the battery case 15 together with the main substrate 31 via screws.

  As shown in FIG. 6, the light emitting unit 4 includes a Fresnel panel 9, a reflector 11, a xenon tube 10, a presser rubber 12, a trigger coil 13, and a strobe holding member 14. The reflector 11 reflects the strobe light emitted from the xenon tube 10 and guides it to the Fresnel panel 9. The Fresnel panel 9 has a function of transmitting strobe light emitted from the xenon tube 10 and light reflected by the reflector 11.

  The xenon tube 10 is connected to the main board 31 via lead wires 16 and 17 (see FIG. 4), and the trigger coil 13 is connected to the main board 31 via lead wires 18 and 19 (see FIG. 4). . The presser rubber 12 holds the xenon tube 10 in a state of being biased toward the reflector 11 side.

  A xenon tube 10, a reflective umbrella 11, and a presser rubber 12 are incorporated in the strobe holding member 14. The strobe holding member 14 is integrally provided with a storage portion 14a in which the trigger coil 13 is incorporated. The light emission trigger signal emitted from the trigger coil 13 is directly applied to the reflector 11 via the lead wire 43 (see FIG. 3).

  The Fresnel panel 9 is integrally provided with a strobe light incident portion 9 a for guiding the strobe light emitted from the xenon tube 10 to the light receiving sensor IC 33 mounted on the main substrate 31 via the glass fiber cable 20. A mounting hole 9b is formed in the strobe light incident portion 9a, and the distal end portion 20a of the glass fiber cable 20 is inserted into the mounting hole 9b and fixed with an adhesive or the like as described above.

  That is, the strobe light emitted from the xenon tube 10 is guided to the light receiving sensor IC 33 through the strobe light incident portion 9a, the glass fiber cable 20, and the strobe light emitting portion 34b. The control CPU 32 controls the light emission amount based on the light emission amount of the xenon tube 10 detected by the light receiving sensor IC33.

  The light emitting unit 4 is positioned and held by fixing the mounting portions 14b and 14c formed integrally with the strobe holding member 14 to the upper cover 2 together with the battery case 15 through screws or the like, and the battery lid 6 and The lower cover 3 is also attached to the upper cover 2.

  As described above, in the present embodiment, the first strobe circuit 31a including the booster circuit and the like, the second strobe circuit 31b including the high voltage circuit for causing the light emitting unit 4 to emit light, and the digital signal are provided on one surface of the main substrate 31. A third strobe circuit 31c including a system control circuit is arranged. Further, the third strobe circuit 31c is disposed at a position further away from the light emitting unit 4 than the first strobe circuit 31a and the second strobe circuit 31b. As a result, the electric parts and the circuit board can be arranged in a space-efficient manner so as to reduce the malfunction due to noise from the light emitting section, thereby further reducing the size and multifunction of the strobe device. In addition, the main capacitor 35 and the battery case 15 are arranged in parallel to each other on the other surface of the main substrate 31, and a plurality of relatively small electrical components are formed in a space formed between the main substrate 31 and the battery case 15. It is arranged. As a result, the electrical components and the circuit board 31 can be arranged more efficiently in space, and the strobe device can be further miniaturized and multi-functionalized.

(Second Embodiment)
Next, a strobe device according to the second embodiment of the present invention will be described with reference to FIG. It should be noted that only the differences from the first embodiment will be described using the same reference numerals for the portions that overlap or correspond to the first embodiment. FIG. 7 is a plan view of the main board 31 viewed from the lower surface side in the strobe device according to the second embodiment of the present invention.

  As shown in FIG. 7, the main substrate 31 emits the light emitting unit 4 with the energy of the first strobe circuit 31 a including the step-up transformer 40, the DC-DC circuit, the step-up circuit, and the like, and the main capacitor 35 charged from the battery 21. And a second strobe circuit 31b including a high voltage circuit. The main board 31 has a third strobe circuit 31c including a digital control circuit on which a power switch, a control CPU 32, and a light receiving sensor IC 33 are mounted.

  The second strobe circuit 31b is disposed at a position closest to the light emitting unit 4 so that the connection distance to the lead wires 16 to 19 drawn from the light emitting unit 4 is as short as possible in order to improve electrical efficiency. The The first strobe circuit 31a is disposed at a position farther from the light emitting unit 4 than the second strobe circuit 31b, and the third strobe circuit 31c is disposed at a position farther from the light emitting unit 4 than the first strobe circuit 31a. .

  In addition, in order to prevent malfunction due to noise from the light emitting unit that occurs during strobe light emission, the third strobe circuit 31c on which the control CPU 32 and the light receiving sensor IC 33 are mounted is further provided than the first strobe circuit 31a and the second strobe circuit 31b. It is arranged at a position away from the light emitting unit 4.

  In the present embodiment, the electrical efficiency is further improved because the connection distance between the second strobe circuit 31b and the lead wires 16 to 19 drawn from the light emitting unit 4 is shorter than the arrangement of the first embodiment. . Other configurations and operational effects are the same as those in the first embodiment.

  In addition, the structure of this invention is not limited to what was illustrated to each said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  For example, in each of the embodiments described above, the strobe device that can be attached to and detached from the imaging device is illustrated, but a strobe device that is integrated with the imaging device may be used.

15 Battery case 31 Main board 31a First strobe circuit 31b Second strobe circuit 31c Third strobe circuit 32 CPU for control
33 Light receiving sensor IC
35 Main capacitor

Claims (7)

A light emitting unit;
A main substrate disposed along a direction intersecting the irradiation surface of the light emitting unit on the back side of the light emitting unit,
The main board is mounted with a first circuit including a booster circuit, a second circuit including a high voltage circuit for causing the light emitting unit to emit light, and a third circuit including a digital control circuit,
The light emitting device, wherein the third circuit is arranged at a position farther from the light emitting unit than the first circuit and the second circuit. The first circuit, the second circuit, and the third circuit are mounted on one surface of the main board,
A capacitor that charges energy for causing the light-emitting portion to emit light and a battery case that stores a battery for charging the energy to the capacitor are provided so as to face the other surface of the main board.
The light emitting device according to claim 1, wherein an electrical component having a volume smaller than that of the control circuit is mounted on the other surface of the main substrate between the battery case and the battery case. It said capacitor-emitting device according to claim 2, wherein the longitudinal direction of the capacitor is found provided so as to be substantially parallel to the crossing direction. 4. The light emitting device according to claim 2 , wherein the capacitor is provided such that a longitudinal direction of the capacitor is substantially parallel to a direction in which the battery is inserted into and removed from the battery case . The light emitting device according to claim 4 , wherein a terminal portion of the capacitor is fixed to the main substrate at a position close to a terminal portion of the battery case fixed to the main substrate . It said second circuit, the light emitting device according to any one of claims 1 to 5, characterized in that it is arranged at a position close to the light emitting portion than the first circuit. The light emitting device according to any one of claims 1 to 6 , wherein the third circuit includes a light receiving sensor for detecting a light emission amount of the light emitting unit.

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