JP4652352B2 - Electronic devices and digital cameras - Google Patents

Description

  The present invention relates to an electronic device equipped with a microphone for recording ambient sounds, and a digital camera.

  An electronic device, such as a digital camera, has a built-in microphone for recording surrounding sounds when shooting a moving image. When shooting a moving image, the subject image captured by the imaging lens is photoelectrically converted by a solid-state imaging device such as a CCD, and at the same time, ambient sounds are recorded by a microphone. The obtained image data and audio data are associated with each other and recorded on a recording medium such as a memory card.

  By the way, in recent years, there has been an increasing demand for further downsizing of electronic devices, and efforts have been made to efficiently mount components in a limited space while minimizing dead space. For this reason, the distance between the components is inevitably shortened, and there is a possibility that components that can be noise sources are arranged at a short distance around the microphone.

Based on such a background, conventionally, a technique for removing noise input to a microphone has been proposed (see Patent Document 1). In the invention described in Patent Document 1, the periodic noise component generated from the mechanism mechanism as a noise source is extracted from the output voice signal of the microphone, and the noise is removed by subtracting the extracted noise component from the output voice signal. is doing.
Japanese Patent Laid-Open No. 11-205891

  However, in the invention described in Patent Document 1, since only a periodic noise component that can be analogized with a certain degree of probability is targeted, a noise component that cannot be analogized is not removed. . In addition, it is necessary to provide a noise detector, a subtractor, and the like, and to construct these control sequences, resulting in a problem of increased production costs.

  The present invention has been made in view of the above problems, and an object thereof is to provide an electronic device and a digital camera that can block noise to a microphone with a simple configuration.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a resin engagement device provided between a microphone, an electric circuit, and the microphone and the electric circuit, to which a metal engagement member is attached. An electronic device including a joint portion is characterized in that a grounded metal noise blocking member is disposed between the microphone and the engaging portion.

  The invention according to claim 2 is a resin tripod provided between a microphone, a power supply circuit for supplying power to the microphone, and the microphone and the power supply circuit, to which a metal tripod fixing screw is attached. A digital camera provided with a fixing screw hole is characterized in that a grounded metal noise blocking member is disposed between the microphone and the tripod fixing screw hole.

  The noise blocking member is preferably fastened and fixed to a substrate on which the power supply circuit is provided and a ground conductor.

  The noise blocking member is preferably bent so that a side end portion thereof does not come into contact with a wiring connecting the microphone and the power supply circuit.

  It is preferable to provide a contact preventing member that prevents a side end portion of the noise blocking member from coming into contact with a wiring connecting the microphone and the power supply circuit. In this case, it is preferable that the contact preventing member is a rib provided integrally with the member in which the tripod fixing screw hole is formed.

  The noise blocking member is preferably fastened and fixed to the member formed with the tripod fixing screw hole and the exterior case.

  According to the electronic device and the digital camera of the present invention, the noise to the microphone can be blocked with a simple configuration in which a noise blocking member is disposed between the microphone and a noise source disposed at a short distance around the microphone. can do.

  1 and 2, the digital camera 2 has a camera body 10 having a substantially rectangular shape. A lens barrel 12 that holds the imaging lens 11, a strobe light emission window 13, an auxiliary light emission window 14, and the like are provided on the front surface of the camera body 10. On the upper surface, a power button 15, a release button 16, and an annular zoom operation lever 17 surrounding the release button 16 are provided. Although not shown, a lid that can be opened and closed is provided on the bottom surface of the camera body 10. When the lid is opened, a memory card slot into which a memory card 96 (see FIG. 7) is detachably loaded and a battery slot into which a battery (not shown) is detachably loaded are exposed.

  A liquid crystal display (hereinafter abbreviated as LCD) 18 and an operation unit 19 are provided on the back of the camera body 10. The LCD 18 displays an image read from the memory card 96, a through image, and various setting screens. The operation unit 19 is a mode dial 20 for switching various modes, a menu button 21 that is operated when a setting screen is displayed on the LCD 18 and a selection content is determined, and a cursor for moving within the setting screen. It consists of a cross button 22 and the like.

  The release button 16 is a two-stage push switch. After the framing of the subject by the LCD 18, when the release button 16 is lightly pressed (half-pressed), various shooting preparation processes such as determination of exposure conditions (AE) and automatic focus adjustment (AF) are performed. In this state, when the release button 16 is pressed once more (fully pressed), one shooting is performed under the determined exposure condition.

  When the mode dial 20 is rotated, a still image shooting mode for shooting still images, a movie shooting mode for shooting movies, a playback mode for displaying captured images on the LCD 18, and a setting mode for performing various settings are selectively available. Can be switched to. In the moving image shooting mode, ambient sounds are recorded by the microphone 46 (see FIG. 3).

  In FIG. 3, the camera body 10 includes a resin front case 30 and a rear case 31, a resin main body base 32 built between the cases 30 and 31, an electric circuit board 33, and a metal ground. And a substrate 34.

  A sound transmission hole 35 for transmitting external sound to the microphone 46 is provided on the front surface of the front case 30. A first attachment tongue 38 having a first insertion hole 37 through which the first attachment screw 36 is inserted projects from the back surface of the front case 30 (see also FIG. 6).

  On the other hand, a jack hole 39 for exposing an external power input jack 55 (described later) is provided on the side surface of the rear case 31. On the rear surface of the rear case 31, a second attachment tongue piece 42 having a second insertion hole 41 through which the second attachment screw 40 is inserted projects (see also FIG. 6). In addition, the front case 30 and the rear case 31 have a plurality of openings and mounting holes for components such as the lens barrel 12.

  A cylindrical projection 45 having a tripod fixing screw hole 44 into which a metal tripod fixing screw 43 is screwed is provided on the bottom surface of the main body base 32. A microphone attachment portion 47 to which a microphone 46 is attached is provided on the front case 30 side of the protrusion 45.

  On the side of the protrusion 45 and the microphone attachment portion 47, a sheet metal attachment portion 49 to which a metal plate 48 as a noise blocking member is attached is provided. The sheet metal attachment portion 49 includes a fitting piece 50 into which the lower step portion 74 (see FIG. 4) of the fourth attachment tongue piece 71 of the sheet metal 48 is fitted, a third insertion hole 51 through which the first attachment screw 36 is inserted, And a fourth insertion hole 52 through which the two mounting screws 40 are inserted (see also FIGS. 5 and 6). In addition, the main body base 32 is provided with a plurality of attachment parts for components such as the release button 16.

  A fifth insertion hole 54 through which the third mounting screw 53 is inserted is formed in the lower portion of the electric circuit board 33 (see also FIG. 6). An external power input jack 55 is attached to the lower side of the electric circuit board 33. A power supply connector (not shown) from an external power supply (not shown) is connected to the external power input jack 55.

  The electric circuit board 33 is provided with a power circuit 56 for supplying power received via the external power input jack 55 to the microphone 46 and a contact 57 to which the power circuit 56 is connected. A harness 58 extending from the microphone 46 is connected to the contact 57 (see FIG. 5). The harness 58 is a collection of wiring for supplying power and wiring for extracting audio signals. Although not shown, the contact 57 is connected to the audio signal processing unit 100 (see FIG. 7) in addition to the power supply circuit 56.

  A third attachment tongue piece 60 having a sixth insertion hole 59 through which the third attachment screw 53 is inserted is provided on the lower side portion of the ground substrate 34. The third attachment tongue piece 60 is bent in a substantially L shape and protrudes from the front surface of the ground substrate 34 toward the front case 30.

  In FIG. 4, the sheet metal 48 includes a sheet metal main body 70 and fourth and fifth attachment tongue pieces 71 and 72 formed integrally with the sheet metal main body 70. The sheet metal main body 70 is bent in a semicircular arc shape so as to follow the shape of the protrusion 45, and the side end portion 73 is directed to the electric circuit board 33 side.

  The fourth attachment tongue piece 71 is bent in a substantially S shape, and has a lower step portion 74 fitted into the fitting piece 50 and an upper step portion 75 formed one step higher than the lower step portion 74. First and second screw holes 76 and 77 into which the first and second mounting screws 36 and 40 are screwed are formed in the lower and upper step portions 74 and 75, respectively.

  On the other hand, the fifth attachment tongue piece 72 is bent at a right angle from the sheet metal body 70 so as to face the front surface of the electric circuit board 33. The fifth attachment tongue 72 has a third screw hole 78 into which the third attachment screw 53 is screwed.

  In FIG. 5 showing a state in which the microphone 46 and the sheet metal 48 are attached to the respective attachment portions 47 and 49, the sheet metal body 70 is disposed between the protrusion 45 and the microphone 46 so as to cover the surface of the protrusion 45 on the microphone 46 side. Placed in. The harness 58 is wound around the outside of the sheet metal main body 70 and connected to the contact 57. However, since the sheet metal main body 70 is bent and the side end portion 73 is directed to the electric circuit board 33 side, the harness 58 is provided. Does not come into contact with the side end portion 73.

  In FIG. 6 showing a state in which the front case 30, the rear case 31, the main body base 32, the electric circuit board 33, and the grounding board 34 are combined to form the camera body 10, the front case 30 and the main body base 32 are respectively The first attachment screw 36 is inserted into the one insertion hole 37 and the third insertion hole 51, and the first attachment screw 36 is screwed into the first screw hole 76, thereby being fastened to the sheet metal 48. Similarly, in the rear case 31 and the main body base 32, the second mounting screw 40 is inserted into the second insertion hole 41 and the fourth insertion hole 52, and the second mounting screw 40 is screwed into the second screw hole 77, respectively. By joining, it is fastened together with the sheet metal 48.

  Further, the electric circuit board 33 and the ground board 34 are respectively inserted with the third attachment screw 53 through the fifth insertion hole 54 and the sixth insertion hole 59 and screwed into the third screw hole 78. By joining, it is fastened together with the sheet metal 48. That is, the electric circuit board 33 and the sheet metal 48 are grounded to the reference potential point by the ground board 34. Since the third mounting tongue 60 protrudes from the front surface of the grounding substrate 34 to the front case 30 side, the electric circuit board 33 and the grounding board 34 are held in a state of being spaced apart from each other, not in surface contact. The Needless to say, the front case 30, the rear case 31, the main body base 32, the electric circuit board 33, and the grounding board 34 are fixed to each other at a plurality of places other than the above-described places.

  When assembling the camera body 10, first, the lower step portion 74 is fitted to the fitting piece 50, and the sheet metal 48 is temporarily fixed to the sheet metal attachment portion 49. Next, the third mounting screw 53 is inserted into the fifth insertion hole 54 and the sixth insertion hole 59, and the third mounting screw 53 is screwed into the third screw hole 78, so that the electric circuit board 33, the grounding board 34, And the sheet metal 48 are fastened together.

  Next, the microphone 46 is attached to the microphone attaching portion 47, and the harness 58 is connected to the contact 57 by hanging around the outside of the sheet metal body 70. Then, after covering the main body base 32, the electric circuit board 33, and the grounding board 34 with the front case 30 and the rear case 31, the first attachment screw 36 is inserted into the first insertion hole 37 and the third insertion hole 51. The first mounting screw 36 is screwed into the first screw hole 76, the second mounting screw 40 is inserted through the second insertion hole 41 and the fourth insertion hole 52, and the second mounting screw 40 is inserted into the second screw hole 76. The front case 30, the rear case 31, the main body base 32, and the sheet metal 48 are fastened together.

  In FIG. 7 showing the electrical configuration of the digital camera 2, a lens motor 80 is connected to the imaging lens 11. An iris motor 82 is connected to the diaphragm 81. These motors 80 and 82 are stepping motors, and their operations are controlled by drive pulses transmitted from motor drivers 84 and 85 connected to the CPU 83.

  The lens motor 80 moves the zoom lens of the imaging lens 11 stepwise to the wide side or the telephoto side in conjunction with the operation of the zoom operation lever 17. At each focal length, the focus lens is moved to stop at the in-focus position. The iris motor 82 operates the aperture 81 to adjust the aperture diameter.

  Behind the imaging lens 11 and the aperture 81, a CCD 86 for capturing a subject image is disposed. A CCD driver 87 controlled by the CPU 83 is connected to the CCD 86. The CCD driver 87 outputs a timing signal (clock pulse) for controlling the charge accumulation time and charge sweep timing of the CCD 86 to the CCD 86.

  The imaging signal output from the CCD 86 is input to the analog signal processing unit 88. The analog signal processing unit 88 performs correlated double sampling on the imaging signal, and outputs R, G, and B image signals that accurately correspond to the accumulated charge amount of each cell of the CCD 86. Then, the image signal is amplified at a predetermined amplification factor and output to an A / D converter (A / D) 89.

  The A / D 89 A / D converts the image signal and outputs digital image data. The image data output from the A / D 89 is input to the SDRAM 91 via the data bus 90 and temporarily stored in the SDRAM 91. The analog signal processing unit 88 and the A / D 89 are synchronously driven according to a timing signal input from a timing generator (not shown), and image data is output at a constant frame rate (for example, 30 frames / second). Output.

  The digital signal processing unit 92 reads image data from the SDRAM 91 and performs various image processing such as gradation conversion, white balance correction, and γ correction on the image data. The image data that has been subjected to image processing by the digital signal processing unit 92 is stored in the SDRAM 91 again.

  The YC conversion processing unit 93 reads the image data from the SDRAM 91 and performs YC conversion for converting the RGB signals into the luminance signal Y and the color difference signals Cr and Cb. The compression / decompression processing unit 94 performs image compression on the image data subjected to YC conversion by the YC conversion processing unit 93 in a predetermined compression format (for example, JPEG format). The image data compressed by the compression / decompression processing unit 94 is stored again in the SDRAM 91.

  The compressed image data is read from the SDRAM 91 to the memory control unit 95 and recorded on the memory card 96 under the control of the memory control unit 95. The image data recorded on the memory card 96 is temporarily stored in the SDRAM 91 via the memory control unit 95, read out to the compression / decompression processing unit 94, and decompressed to the image data before being compressed.

  Connected to the LCD driver 97 is a VRAM (not shown) in which image data for two frames subjected to simple YC conversion by the YC conversion processor 93 is stored. The VRAM performs writing and reading of image data in parallel. The LCD driver 97 converts the image data read from the VRAM into an analog composite signal and displays it as a through image on the LCD 18. The LCD driver 97 displays the image data expanded by the compression / expansion processing unit 94 on the LCD 18 as a reproduced image.

  The CPU 83 transmits a control signal to each unit via the control bus 98 and receives a response signal from each unit to control the operation of each unit in an integrated manner. In addition to the release button 16 and the operation unit 19, the CPU 83 is connected to an EEPROM 99 in which various control programs and setting information are recorded, an audio signal processing unit 100, and a photometry / ranging unit 101.

  In response to the operation input signal from the release button 16, the CPU 83 causes each unit to execute processing associated with half-pressing and full-pressing of the release button 16. Further, the CPU 83 operates each unit in accordance with an operation input signal input from the operation unit 19, reads various information from the EEPROM 99 to the built-in RAM, and executes processing.

  The audio signal processing unit 100 includes an amplifier (AMP), an A / D converter (A / D), a noise reducer, and the like. The audio signal processing unit 100 amplifies the audio input from the microphone 46 with AMP and converts it into digital audio data with A / D. Then, the noise is electrically removed by a noise reducer and output to the CPU 83. The CPU 83 outputs the audio data output from the audio signal processing unit 100 to the memory control unit 95, and the memory control unit 95 records the audio data in the memory card 96 in association with the image data.

  The photometry / ranging unit 101 detects the luminance of the subject and the distance to the subject, and determines the exposure amount, the white balance correction amount, and the focal length from the detection result. The photometry / ranging unit 101 operates in a predetermined cycle while displaying a through image. During the display of the through image, the iris motor 82 is operated by the motor driver 85 according to the exposure amount determined by the photometry / ranging unit 101, and the aperture diameter of the aperture 81 is controlled. When an appropriate exposure amount cannot be obtained only by the aperture diameter, the charge accumulation time of the CCD 86 is controlled by the CCD driver 87.

  The photometry / ranging unit 101 starts detection of luminance and distance when the release button 16 is half-pressed, and sequentially transmits the detection result to the CPU 83. The CPU 83 controls the operations of the imaging lens 11, the diaphragm 81, and the CCD 86 based on the detection result from the photometry / ranging unit 101.

  Next, the operation of the digital camera 2 having the above configuration will be described. When taking a still image with the digital camera 2, the power button 15 is operated to turn on the digital camera 2. Then, the still picture shooting mode is selected by operating the mode dial 20.

  In the still image shooting mode, a subject image that has entered through the imaging lens 11 and the aperture 81 is formed on the imaging surface of the CCD 86, whereby an imaging signal is output from the CCD 86. The imaging signal output from the CCD 86 is correlated double-sampled and amplified by the analog signal processing unit 88, and converted into digital image data by the A / D 89.

  The image data output from the A / D 89 is input to the SDRAM 91 via the data bus 90 and temporarily stored in the SDRAM 91. The image data stored in the SDRAM 91 is subjected to simple YC conversion by the YC conversion processing unit 93 and then stored in the VRAM. The image data stored in the VRAM is sequentially read out by the LCD driver 97, converted into a composite signal by the LCD driver 97, and displayed on the LCD 18 as a through image.

  When the release button 16 is pressed halfway during the through image display, the photometry / ranging unit 101 detects the brightness of the subject and the distance to the subject, and determines the exposure amount, white balance correction amount, and focal length. . Based on this result, the CPU 83 controls the operations of the imaging lens 11, the diaphragm 81, and the CCD 86, and performs a shooting preparation process.

  When shooting is performed by fully pressing the release button 16, still image shooting is performed based on the determined exposure amount, and image data obtained thereby is stored in the SDRAM 91. The image data stored in the SDRAM 91 is read out by the digital signal processing unit 92 and subjected to various image processing, and then stored in the SDRAM 91 again. Then, after being read by the YC conversion processing unit 93 and subjected to full-scale YC conversion, the compression processing is performed by the compression / decompression processing unit 94 and stored again in the SDRAM 91. The compressed image data stored in the SDRAM 91 is read by the memory control unit 95 and recorded on the memory card 96 under the control of the memory control unit 95.

  When the mode dial 20 is operated to select a moving image shooting mode, and the release button 16 is fully pressed to start shooting a moving image, an image pickup signal is output from the CCD 86 at a constant frame rate. Then, the analog signal processing unit 88, the digital signal processing unit 92, the YC conversion processing unit 93, and the compression / decompression processing unit 94 perform the same processing as in the still image shooting mode, and the image data generated thereby is sequentially stored in the memory card. 96. At the same time, ambient sound is recorded by the microphone 46. The sound input to the microphone 46 is converted into digital sound data by the sound signal processing unit 100 and output to the CPU 83. The audio data output to the CPU 83 is recorded on the memory card 96 in association with the image data by the memory control unit 95.

  Here, in order to use a tripod, a tripod fixing screw 43 is screwed into the screw hole 44 for fixing the tripod, and an external power source is connected to the external power input jack 55 to input an external power source to the microphone 46. When a moving image is taken with the camera connected, the tripod fixing screw 43, the microphone 46, and the power supply circuit 56 are arranged close to each other, and noise is added to the sound recorded by the microphone 46 due to their interaction. Although there is a possibility, since the sheet metal 48 is disposed between the tripod fixing screw hole 44 and the microphone 46 and the sheet metal 48 is connected to the ground substrate 34 via the third mounting screw 53, the tripod fixing screw 43. Noise generated by the interaction between the microphone 46 and the power supply circuit 56 is completely blocked by the sheet metal 48.

  On the other hand, when the mode dial 20 is operated to select a playback mode and an image playback instruction is issued, the image data recorded on the memory card 96 is stored in the SDRAM 91. Then, the image data is read from the SDRAM 91 to the compression / decompression processing unit 94, decompressed by the compression / decompression processing unit 94, becomes the original image data, and is stored in the SDRAM 91 again. The decompressed image data stored in the SDRAM 91 is read by the LCD driver 97 and reproduced and displayed on the LCD 18.

  As described above, since the noise is cut off by the sheet metal 48, clear sound can be always recorded. Further, the front case 30 and the main body base 32, the rear case 31 and the main body base 32, and the electric circuit board 33 and the grounding board 34 are fastened to the sheet metal 48 with first to third mounting screws 36, 40, and 53, respectively. Therefore, the assembly strength between these components and the mechanical strength of each component itself can be increased, and the number of assembly components can be reduced and the assembly process can be simplified. In addition, the aspect which does not set it as the structure which fastens these components together is also contained in this invention.

  In the above embodiment, the sheet metal body 70 is bent in a semicircular arc shape so as to follow the shape of the protrusion 45 so that the side end portion 73 of the sheet metal 48 does not contact the harness 58, but as shown in FIG. The main body 70 may not be processed, and the contact prevention rib 110 may be provided between the position where the harness 58 of the main body base 32 is suspended and the side end portion 73. However, since it is necessary to secure a space for installing the contact prevention rib 110, it is more preferable to bend the sheet metal body 70 as in the above embodiment.

  In the above embodiment, the digital camera 2 has been described as an example of the electronic device. However, the present invention is not limited to this, and the present invention can be applied to any electronic device that records sound using a microphone. Similarly, the tripod fixing screw hole 44 and the power supply circuit 56 of the above-described embodiment are examples of the engaging portion and the electric circuit according to the first aspect, and the present invention is not particularly limited thereto.

It is a perspective view which shows the front view of a digital camera. It is a top view which shows the back surface outline of a digital camera. It is a disassembled perspective view which shows the structure of a camera main body. It is a perspective view which shows the structure of a sheet metal. It is an expansion perspective view which shows the structure of the periphery of a microphone. It is an expanded sectional view which shows the periphery structure of a microphone. It is a block diagram which shows the electric constitution of a digital camera. It is an expansion perspective view which shows the structure of the periphery of the microphone in another embodiment.

Explanation of symbols

2 Digital Camera 10 Camera Body 11 Imaging Lens 16 Release Button 18 Liquid Crystal Display (LCD)
19 Operation section 30 Front case 31 Rear case 32 Main body base 33 Electric circuit board 34 Grounding board 36, 40, 53 First to third mounting screws 37, 41, 51, 52, 54, 59 First to sixth insertion holes 43 Screw for fixing tripod 44 Screw hole for fixing tripod 46 Microphone 48 Sheet metal 55 External power input jack 56 Power supply circuit 58 Harness 73 Side end 76 to 78 First to third screw hole 83 CPU
86 CCD
96 Memory card 100 Audio signal processor 110 Contact prevention rib

Claims (7)

In an electronic device including a microphone, an electric circuit, and a resin engaging portion provided between the microphone and the electric circuit, to which a metal engaging member is attached,
An electronic apparatus, wherein a grounded metal noise blocking member is disposed between the microphone and the engaging portion. Digital provided with a microphone, a power supply circuit for supplying power to the microphone, and a resin tripod fixing screw hole provided between the microphone and the power supply circuit, to which a metal tripod fixing screw is attached In the camera
A digital camera, wherein a grounded metal noise blocking member is disposed between the microphone and the tripod fixing screw hole.   The digital camera according to claim 2, wherein the noise blocking member is fastened and fixed to a substrate on which the power supply circuit is provided and a ground conductor.   4. The digital camera according to claim 2, wherein the noise blocking member is bent so that a side end portion thereof does not come into contact with a wiring connecting the microphone and the power supply circuit. 5.   5. The digital camera according to claim 2, further comprising a contact prevention member that prevents a side end portion of the noise blocking member from contacting a wiring that connects the microphone and the power supply circuit.   6. The digital camera according to claim 5, wherein the contact preventing member is a rib provided integrally with the member in which the tripod fixing screw hole is formed.   7. The digital camera according to claim 2, wherein the noise blocking member is fastened and fixed to a member formed with the tripod fixing screw hole and an outer case.

Images