JP2012124705A - Electronic apparatus - Google Patents

Abstract

A mechanism capable of wiring a microphone signal wiring pattern at a low cost without being affected by noise of a power supply wiring pattern on a substrate on which a power supply wiring pattern of a motor driving a lens barrel is wired. I will provide a.
A digital camera includes a lens barrel 3, a motor that drives the lens barrel 3, a microphone, a power supply wiring pattern that supplies power to the motor, and a microphone signal wiring of the microphone. A lens barrel flexible wiring board 42 to which a pattern is wired, an audio circuit block 47 for processing a microphone signal, and a main wiring board 6 on which a lens barrel driving circuit block 49 for controlling driving of a lens barrel is mounted. . The microphone signal wiring pattern and the power supply wiring pattern are wired so as to extend away from the central portion of the lens barrel flexible wiring board 42 and are connected to the main wiring board 6 through different wiring paths.
[Selection] Figure 4

Description

  The present invention relates to an electronic apparatus having a recording function, such as a digital camera, a video camera, and a camera-equipped mobile phone.

  In an electronic device having a recording function such as a digital camera, a video camera, or a camera-equipped mobile phone, a microphone is incorporated in the device, and the microphone is connected to an audio circuit block mounted on the substrate via a cable or a flexible wiring substrate. Connected. A motor for driving the lens barrel is disposed inside the device, and the power supply wiring to the motor is one of the electrical noise sources for the microphone signal. Therefore, a technique for shielding the microphone case (Patent Document 1) and a technique for canceling noise using a differential amplifier have been proposed (Patent Document 2).

JP-A-11-155197 JP 2005-252945 A

  By the way, as the miniaturization of the device progresses, if the microphone is arranged in the grip portion held by the user, the microphone may be blocked by hand. For this reason, the microphone is often arranged around the lens barrel, and the distance between the microphone and the lens barrel is getting closer. Therefore, when the microphone signal wiring pattern and the motor power supply wiring pattern are arranged close to each other, electrical noise from the power supply wiring pattern is easily superimposed on the microphone signal.

  However, in the said patent document 1, consideration is not made | formed with respect to the wiring of the microphone connected to a main wiring board. In Patent Document 2, there is a concern about an increase in cost due to the addition of a differential circuit.

  Therefore, the present invention is to wire the microphone signal wiring pattern at a low cost without being affected by the noise of the power supply wiring pattern on the substrate on which the power supply wiring pattern of the motor driving the lens barrel is wired. The purpose is to provide a mechanism that can

  In order to achieve the above object, an electronic device according to the present invention includes a lens barrel, a motor that drives the lens barrel, a microphone, and a power supply wiring pattern that supplies power to the motor. And a lens barrel flexible wiring board on which a microphone signal wiring pattern of the microphone is wired, an audio circuit block for processing a microphone signal, and a main wiring on which a lens barrel driving circuit block for controlling driving of the lens barrel is mounted A wiring pattern for the microphone signal and the wiring pattern for power supply extending in a direction away from each other from a central portion of the lens barrel flexible wiring board, and the main wiring is routed through different wiring paths. It is connected to a substrate.

  According to the present invention, the microphone signal wiring pattern is wired at a low cost without being affected by the noise of the power supply wiring pattern on the board on which the power supply wiring pattern of the motor driving the lens barrel is wired. Can do.

It is the disassembled perspective view which looked at the digital camera which is 1st Embodiment of the electronic device of this invention from the front side. It is the disassembled perspective view which looked at the digital camera shown in FIG. 1 from the back side. It is the perspective view which looked at the assembly unit of a lens-barrel and a main wiring board from the front side. It is the perspective view which looked at the assembly unit shown in FIG. 3 from the back side. It is the disassembled perspective view which looked at the lens-barrel flexible wiring board, the shutter flexible wiring board, and the flexible wiring board for camera shake correction from above. It is the disassembled perspective view which looked at FIG. 5 from the downward direction. It is a component surface wiring development view of a lens barrel flexible wiring board. It is a solder surface wiring development view (perspective view) of a lens barrel flexible wiring board. (A) is an enlarged view of the microphone signal wiring part of FIG. 7, (b) is an enlarged view of the microphone signal wiring part of FIG. In the digital camera which is 2nd Embodiment of the electronic device of this invention, it is the disassembled perspective view which looked at the lens-barrel flexible wiring board, the shutter flexible wiring board, and the flexible wiring board for camera shake correction from the upper direction. It is a component surface wiring development view of a lens barrel flexible wiring board. It is a solder surface wiring development view (perspective view) of a lens barrel flexible wiring board.

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

(First embodiment)
FIG. 1 is an exploded perspective view of a digital camera according to a first embodiment of the electronic apparatus of the present invention as viewed from the front side, and FIG. 2 is an exploded perspective view of the digital camera shown in FIG.

  As shown in FIGS. 1 and 2, in the digital camera of the present embodiment, the lens barrel 3, the chassis 4, and the liquid crystal panel 41 are disposed between the front cover 1 and the back cover 2 from the front side toward the back side. Has been placed.

  A battery case 5 that houses a battery 15 is disposed on the left side when viewed from the front side (subject side) of the lens barrel 3, and a main wiring board 6 is disposed on the back side of the battery case 5. Yes. The lens barrel 3, the battery case 5 and the main wiring board 6 are fixed to the chassis 4 via screws or the like.

  A CPU, a memory, a lens barrel driving circuit, an audio circuit, a power supply circuit, and the like are mounted on the main wiring board 6, and on the back side, a card slot and HDMI of a memory card 7 that is an external memory for storing video and audio. A connector 8 is mounted. A heat radiating plate 14 is disposed on the front surface of the battery case 5, and a battery lid 21 is provided at the bottom of the battery case 5 and the card slot so as to be freely opened and closed. The battery 15 and the memory card 7 can be inserted and removed by opening and closing the battery lid 21.

  Further, a USB connector 34 mounted on the jack wiring board 33 is fitted into the recess 5a provided in the battery case 5, and the USB connector 34 is fixed to the battery case 5 with screws or the like. The side cover 35 forms an exterior of the left side when the digital camera is viewed from the front side (subject side), and is fixed to the chassis 4 with screws or the like together with a strap ring 37 for passing the strap string. The side cover 35 is provided with a recess 35 a that houses a jack cover 36 for covering the USB connector 34 and the HDMI connector 8.

  An upper surface flexible wiring board 9 is connected to the upper portion of the main wiring board 6 by a connector, and a power connector 10 is mounted on the upper surface flexible wiring board 9. Power is sent to the power circuit block of the main wiring board 6 via the upper surface flexible wiring board 9. A release switch 11, a power switch 12, and an AF auxiliary light LED 13 are mounted on the upper surface flexible wiring board 9.

  An upper surface cover 16 is disposed on the upper surface side of the upper surface flexible wiring board 9, and a zoom lever 17, a release button 18, a power button 19, and a mode dial 20 are held on the upper surface cover 16.

  A strobe unit 22 is disposed on the right side when viewed from the front side (subject side) of the lens barrel 3. The strobe unit 22 includes a pop-up strobe light emitting unit 23, a main capacitor 24, and a speaker 26.

  A strobe wiring board 25 on which a strobe circuit is mounted is fixed to the back side of the main capacitor 24. The speaker cable of the speaker 26 is soldered to the strobe wiring board 25.

  The strobe unit 22 is disposed above the ultrasonic motor 27 assembled on the right side when viewed from the front side (subject side) of the lens barrel 3, and is fixed to the lens barrel 3 with screws or the like. Further, the side cover 39 forms an exterior of a right side when the digital camera is viewed from the front side (subject side), and is fixed to the chassis 4 with screws or the like.

  A rear operation flexible wiring board 30 is connected to a side portion of the liquid crystal panel 41, and operation buttons such as a reproduction button 31 and a rotation operation module 32 are mounted on the rear operation flexible wiring board 30. The rotation operation module 32 is fixed to the chassis 4 together with the rear operation flexible wiring board 30.

  A microphone 29 is arranged on the left side when viewed from the front side (subject side) of the lens barrel 3, and a microphone 28 is arranged on the right side. Here, in this embodiment, of the microphones 28 and 29, at least the microphone 28 is a silicon microphone that requires a power source.

  3 is a perspective view of the assembly unit of the lens barrel 3 and the main wiring board 6 as seen from the front side, and FIG. 4 is a perspective view of the assembly unit shown in FIG. 3 as seen from the back side.

  3 and 4, the lens barrel flexible wiring board 42 is disposed along the outer peripheral portion and the back surface portion of the lens barrel 3. The lens barrel flexible wiring board 42 includes a power supply wiring pattern for driving the lens barrel 3, signal lines of sensors 61, 62, and 63 (see FIG. 7) for detecting the extension position of the lens barrel 3, and lenses. A signal line of a thermistor (not shown) for measuring the temperature of the lens barrel 3 is wired. A microphone 28 is mounted on the lens barrel flexible wiring board 42, and a signal line of the microphone 28 is also wired.

  The imaging flexible wiring board 43 is disposed on the back side of the lens barrel 3, is connected to the main wiring board 6 via a connector, and sends an imaging signal output from an imaging element (not shown) to the main wiring board 6. . The lens barrel flexible wiring board 42 and the main wiring board 6 are connected at two locations above and below the imaging flexible wiring board 43.

  The microphone signal connector terminal section 44 is a terminal section for connecting the signal line of the microphone 28 wired to the lens barrel flexible wiring board 42 to the main wiring board 6, and is connected to the microphone signal connector 45 of the main wiring board 6. Connected. The lens barrel signal connector 46 connects the power supply wiring pattern wired to the lens barrel flexible wiring board 42, the signal lines of the sensors 61, 62, and 63 to the lens barrel signal connector 48 of the main wiring board 6.

  An audio circuit block 47 for processing a microphone signal is disposed in the vicinity of the microphone signal connector 45 on the main wiring board 6. In this manner, by arranging the audio circuit block 47 in the vicinity of the microphone signal connector 45 of the main wiring board 6, it is possible to prevent noise from being mixed from other circuit blocks mounted on the main wiring board 6.

  In the vicinity of the lens barrel signal connector 48 on the main wiring board 6, a lens barrel drive circuit block 49 is arranged. The lens barrel drive circuit block 49 supplies power of a voltage necessary for a motor for driving the lens barrel 3 to the barrel flexible wiring board 42, and controls operations such as feeding and retracting of the lens barrel 3.

  For motor control, PWM (Pulse Width Modulation) control is used, and a high frequency pulse voltage of several tens of kHz is applied to the motor. The lens barrel drive circuit block 49 has a switching circuit, and controls the rotation speed based on the period of the switching frequency and the energization time. Also in the ultrasonic motor 27, high-frequency pulses are generated in order to ultrasonically vibrate the piezoelectric element during driving.

  5 is an exploded perspective view of the lens barrel flexible wiring board 42, the shutter flexible wiring board 50, and the camera shake correction flexible wiring board 54 as viewed from above, and FIG. 6 is an exploded perspective view of FIG. 5 as viewed from below.

  In the shutter flexible wiring board 50, a power supply wiring pattern is connected to a motor 51 that drives a shutter and diaphragm blades. The shutter connector terminal portion 52 is connected to a shutter connector 53 mounted on the lens barrel flexible wiring board 42.

  The camera shake correction flexible wiring board 54 is connected to a camera shake correction unit that holds a camera shake correction lens, and a power supply wiring pattern is connected to an electromagnet coil 55 to drive the camera shake correction mechanism.

  Further, a Hall element is mounted on the camera shake correction flexible wiring board 54, and the position of the camera shake correction unit is detected by detecting magnetism. The camera shake correction connector terminal portion 56 is connected to a camera shake correction connector 57 mounted on the lens barrel flexible wiring board 42.

  The ultrasonic motor flexible wiring board 58 is provided with a power supply wiring pattern for driving the ultrasonic motor 27 for zooming the lens barrel 3. The ultrasonic motor connector terminal portion 59 is connected to the ultrasonic motor connector 60 mounted on the lens barrel flexible wiring board 42. In the present embodiment, the sensors 61, 62, and 63 are configured by photo interrupters, and detect the driving position of the lens barrel 3.

  The connectors 53, 57, and 60 of the lens barrel flexible wiring substrate 42 to which the shutter flexible wiring substrate 50, the camera shake correcting flexible wiring substrate 54, and the ultrasonic motor flexible wiring substrate 58 are connected are arranged in the circumferential direction of the lens barrel 3. Located on the lower side. Then, the lens barrel signal connector 46 of the lens barrel flexible wiring board 42 is connected to the lens barrel signal connector 48 disposed in the lower part on the back side of the main wiring board 6. For this reason, the distance between the connectors 53, 57, 60 and the lens barrel drive circuit block 49 disposed in the vicinity of the lens barrel signal connector 48 of the main wiring board 6 can be shortened, and power transmission loss can be suppressed.

  FIG. 7 is a component surface wiring development view of the lens barrel flexible wiring board 42, and FIG. 8 is a solder surface wiring development view (perspective view) of the lens barrel flexible wiring board 42. 9A is an enlarged view of the microphone signal wiring portion of FIG. 7, and FIG. 9B is an enlarged view of the microphone signal wiring portion of FIG.

  As shown in FIGS. 7 and 9A, a microphone signal output pattern 101c and microphone ground patterns 101d and 101e are wired in the component-side microphone signal wiring pattern region 101a, and a power supply pattern of the microphone 28 is wired. . On the back surface of the microphone signal output pattern 101c, as shown in FIGS. 8 and 9B, a solder surface microphone signal wiring pattern region 101b is arranged.

  A microphone ground pattern 101f is wired in the solder surface microphone signal wiring pattern region 101b, thereby guarding against the influence of electrical noise from the main wiring board 6 and the outside. The microphone signal wiring pattern regions 101a and 101b extend toward the main wiring board 6 along the upper part on the back side of the lens barrel 3, and the microphone signal connector terminal portion 44 is arranged on the back side upper part of the main wiring board 6. The microphone signal connector 45 is connected.

  In the position detection signal pattern region 102, wiring patterns of the sensors 61 and 62 made of photo interrupters are wired. The position detection signal pattern area 102 is wired up to the lens barrel signal connector 46 and is wired adjacent to the microphone signal wiring pattern areas 101a and 101b. However, there is no problem because the signal does not generate noise.

  The strobe signal connector terminal portion 103 is wired with strobe power supply patterns 104a and 104b and strobe light emission control signal pattern areas 105a and 105b. An upper surface connector 64 is connected to the power supply patterns 104 a and 104 b for strobes, and the upper surface connector 64 is connected to the upper surface flexible wiring board 9.

  Since the power supply of the strobe is the same voltage as the battery, the upper surface flexible wiring board 9 can wire the power supply for the strobe directly from the power connector 10, and the power transmission loss can be reduced. During strobe light emission, there is no recording on the microphone 28, so there is no effect on the microphone signal.

  The shutter flexible wiring board 50 is inserted into the shutter connector 53. In the shutter pattern areas 106a and 106b, a power supply wiring pattern for a motor that drives a shutter, a power supply wiring pattern for a motor that drives an aperture, and the like are wired. A camera shake correction flexible wiring board 54 is inserted into the camera shake correction connector 57. In the camera shake correction signal pattern areas 107a and 107b, a power supply wiring pattern necessary for driving a motor of the camera shake correction unit, an output signal line of a hall element, and the like are wired.

  An ultrasonic motor flexible wiring board 58 is inserted into the ultrasonic motor connector 60. In the ultrasonic motor pattern area 108, a power supply wiring pattern for driving the ultrasonic motor 27 and a detection signal line of the sensor 63 are wired.

  The power supply wiring pattern of the ultrasonic motor 27 and the detection signal line of the sensor 63 are wired with a clearance in order to prevent noise from entering the detection signal of the sensor 63 from the power supply wiring pattern. So that they are not overlapped with each other. When the power supply wiring pattern of the ultrasonic motor 27 and the detection signal line of the sensor 63 overlap on the front and back of the substrate, crosstalk can be prevented by making the patterns orthogonal.

  As described above, in this embodiment, the microphone signal wiring pattern areas 101a and 101b and the power supply wiring patterns 106a, 106b, 107a, 107b, and 108 are separated from the central portion of the lens barrel flexible wiring board 42. It is extended and wired.

  The power supply wiring patterns 106 a, 106 b, 107 a, 107 b, 108 are wound around the lower side and the lower back side of the lens barrel 3 in the circumferential direction so that the lens barrel signal connector 46 is connected to the main wiring board 6. Is connected to a lens barrel signal connector 48 disposed at the lower part of the rear side of the lens. The microphone signal wiring pattern regions 101 a and 101 b extend to the main wiring board 6 side along the upper part on the back side of the lens barrel 3, and the microphone signal connector terminal portion 44 is arranged on the back side upper part of the main wiring board 6. The microphone signal connector 45 is connected. For this reason, the microphone signal wiring pattern areas 101a and 101b and the power supply wiring patterns 106a, 106b, 107a, 107b, and 108 are wired so as to be separated from each other by different wiring paths.

  As a result, even when the lens barrel 3 is operated by driving the motor during recording with the microphone 28, the electrical noise of the power supply wiring patterns 106a, 106b, 107a, 107b, 108 is superimposed on the signal of the microphone 28. Can be prevented.

  Further, in the present embodiment, since a differential circuit for canceling electrical noise of the power supply wiring patterns 106a, 106b, 107a, 107b, and 108 is not required as in the prior art, an additional differential circuit is added. The cost increase due to can be avoided.

  Furthermore, since the microphone 28 is mounted on the lens barrel flexible wiring board 42 and the microphone signal wiring pattern regions 101a and 101b are connected to the main wiring board 6, the wiring cost can be reduced compared to the case of connecting with a cable. Can do.

(Second Embodiment)
Next, a digital camera which is a second embodiment of the electronic apparatus of the present invention will be described with reference to FIGS. In addition, about the part which overlaps or corresponds to the said 1st Embodiment, the same code | symbol is attached | subjected to each figure and the description is abbreviate | omitted.

  FIG. 10 is an exploded perspective view of the lens barrel flexible wiring board 42, the shutter flexible wiring board 50, and the camera shake correcting flexible wiring board 54 as viewed from above.

  In this embodiment, stereo recording is enabled by mounting a microphone 29 made of a silicon microphone in addition to the microphone 28 on the lens barrel flexible wiring board 42. The microphone 29 is mounted on a portion 42c obtained by extending the lens barrel flexible wiring board 42, and the microphone 29 and the microphone 28 are arranged so as to be substantially symmetrical left and right with the lens barrel 3 as the center. By arranging the microphones 28 and 29 in this way, it is possible to reduce the difference in intensity between the left and right sounds with respect to the captured image.

  FIG. 11 is a component surface wiring development view of the lens barrel flexible wiring board 42, and FIG. 12 is a solder surface wiring development view (perspective view) of the lens barrel flexible wiring substrate 42.

  Similarly to the microphone 28, a microphone signal output pattern and a microphone ground pattern are wired in the component surface microphone signal wiring pattern area 109 a of the microphone 29, and a power supply pattern of the microphone 29 is wired. On the back surface of the microphone signal output pattern, a solder surface microphone signal wiring pattern region 109b is arranged. A microphone ground pattern is wired in the solder surface microphone signal wiring pattern region 109b, thereby guarding against the influence of electrical noise from the main wiring board 6 and the outside.

  The microphone signal wiring pattern regions 109 a and 109 b are connected to the microphone signal connector terminal portion 44, similarly to the microphone signal wiring pattern regions 101 a and 101 b, and the microphone signal connector terminal portion 44 is connected to the microphone of the main wiring board 6. It is connected to the signal connector 45.

  The wiring length from the microphone 28 to the microphone signal connector terminal portion 44 and the wiring length from the microphone 29 to the microphone signal connector terminal portion 44 are wired so as to be substantially the same. As a result, it is possible to prevent time lag from occurring in the left and right microphone signals that are reached during sampling in the audio circuit block 47.

  As described above, in the present embodiment, the microphone signal wiring pattern regions 101a, 101b, 109a, 109b and the power supply wiring patterns 106a, 106b, 107a, 107b, 108 of the lens barrel flexible wiring board 42 are separated from each other. Wired in the direction. Therefore, as in the first embodiment, the microphone signal wiring pattern areas 101a, 101b, 109a, 109b and the power supply wiring patterns 106a, 106b, 107a, 107b, 108 are different from each other in different wiring paths. Wired away.

  As a result, even if the lens barrel 3 is operated by driving the motor during recording by the microphones 28 and 29, the electric noise of the power supply wiring patterns 106a, 106b, 107a, 107b, 108 is not reduced. Can be prevented from being superimposed on the signal. Other configurations and operational effects are the same as those of the first embodiment.

  The configuration of the present invention is not limited to those exemplified in the above embodiments, and the material, shape, dimensions, form, number, arrangement location, and the like are appropriately changed without departing from the gist of the present invention. Is possible.

3 Lens barrel 6 Main wiring board 27 Ultrasonic motors 28 and 29 Microphone 42 Lens barrel flexible wiring board 47 Audio circuit block 49 Lens barrel drive circuit blocks 101a and 101b Microphone signal wiring pattern area 101c Microphone signal output patterns 101d and 101e Microphone Ground pattern 106a, 106b, 107a, 107b, 108 Power supply wiring pattern

Claims (5)

A lens barrel;
A motor for driving the lens barrel;
A microphone is mounted, a power supply wiring pattern for supplying power to the motor, and a lens barrel flexible wiring board on which a microphone signal wiring pattern of the microphone is wired,
An audio circuit block for processing a microphone signal, and a main wiring board on which a lens barrel driving circuit block for controlling driving of the lens barrel is mounted,
The microphone signal wiring pattern and the power supply wiring pattern are wired so as to extend away from the central portion of the lens barrel flexible wiring board and are connected to the main wiring board through different wiring paths. Electronic equipment characterized by The microphone signal wiring pattern is connected to the upper back side of the main wiring board,
The electronic apparatus according to claim 1, wherein the power supply wiring pattern is connected to a lower part on the back side of the main wiring board. The audio circuit block is disposed in the vicinity of the portion of the main wiring board to which the microphone signal wiring pattern is connected,
3. The electronic apparatus according to claim 1, wherein the lens barrel drive circuit block is disposed in the vicinity of a portion of the main wiring board to which the power supply wiring pattern is connected.   4. The electronic device according to claim 1, wherein a microphone signal output pattern and a microphone ground pattern are wired to the microphone signal wiring pattern. 5.   The electronic device according to any one of claims 1 to 4, wherein the microphone is a silicon microphone.