JP4085320B2 - Digital camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital camera, and more particularly to a digital camera provided with a speaker capable of outputting sound and the like.
[0002]
[Prior art]
In a camera-integrated video for recording moving images, the lens caps are configured in half, and a microphone element is provided for each cap element, and these cap elements are attached to the tip of the lens barrel by a ratchet structure support mechanism. A microphone structure that can be locked at an arbitrary opening / closing angle has been proposed (see Patent Document 1).
[0003]
In addition, in a conventional digital camera, for example, a digital camera capable of reproducing a moving image has a built-in speaker, and an image displayed on the liquid crystal monitor can be confirmed while listening to sound from the speaker.
[0004]
A digital camera having a music playback function for playing back an audio signal recorded on a recording medium in the camera body is also known.
[0005]
Here, the quality of the sound quality of a general speaker is approximately proportional to the diameter of the speaker and the depth of the casing in which the speaker is accommodated. If depth (gap) is provided at the back of the speaker, you can expect powerful sound quality with deep bass increased by the baffle effect.
[0006]
[Patent Document 1]
JP-A-6-233162
[0007]
[Problems to be solved by the invention]
However, since the size of a speaker built into a small digital camera is limited, a small one is generally used, and the sound quality of a speaker built into a digital camera is not good. There were drawbacks.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to provide a digital camera in which the diameter of a speaker of a digital camera can be increased and a baffle effect can be obtained and the sound quality is improved.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides:Provided with audio playback means for converting audio signals to audio and outputting themIn digital cameras,Provided in the camera bodyLens barrelofOn the lens cap that can be attached to the frontFirstWith speakersOn the other hand, a second speaker is built in the camera body, and the speaker for switching the audio output speaker so as to selectively use either the first speaker or the second speaker. Based on a detection signal from the attachment detection means, and an attachment detection means for detecting whether or not the lens cap provided with the first speaker is attached to the lens barrel. The switching of the speaker switching means is controlled so that the first speaker can be used when the lens cap is attached to the lens barrel, while the lens cap is not attached to the lens barrel. Control means for performing control to enable use of the second speaker.It is characterized by that.
[0010]
According to the present invention, by providing the speaker with the lens cap that is detachably attached to the front portion of the lens barrel and protects the lens, the speaker diameter can be increased, and the baffle effect using the lens barrel can be achieved. To improve sound quality.
[0015]
  In the present inventionSuch a digital camera has both a first speaker mounted on the lens cap and a second speaker built in the camera body as an audio output path. It can be used by switching manually or automatically. For example, a camera built-in speaker (second speaker) is usually used to output sound, and a lens cap speaker (first speaker) is used particularly in situations where acoustic effects are required.
[0016]
Thus, the configuration using the lens cap with the speaker enables high-quality audio output as needed, and is convenient for carrying around.
[0018]
  In addition, the present inventionAccording to the above, the attachment detection means detects the mounting state of the lens cap, and the control means automatically switches the output destination (speaker to be used) of the audio signal based on the detection signal. When the lens cap is attached to the lens barrel and the state of outputting sound using the lens cap speaker (first speaker) is ready, the output destination of the audio signal is automatically set to the first speaker. Such an automatic selection function simplifies the user's operation.
  Furthermore, the digital camera according to an aspect of the present invention is characterized in that the lens cap and the camera body are connected by an output wiring for audio output of the speaker. According to this aspect, the lens cap can be prevented from being lost, and the output wiring of the speaker can be easily configured.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a digital camera according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a digital camera 10 according to an embodiment of the present invention.
[0020]
In the figure, reference numeral 12 denotes a camera body, hereinafter, 14 is a lens barrel, 16 is a shutter button, 17 is a shooting mode / playback mode, a mode dial for selecting an audio playback mode, 18 is a pop-up strobe, 20 is a finder, and 22 is a built-in microphone. In addition to the above-described devices, the camera body 12 is provided with devices such as a strobe light control sensor and a self-timer lamp (not shown) as necessary.
[0021]
A lens barrel 14 formed in a substantially cylindrical shape is provided on the front surface of the camera body 12, and a lens 13 is disposed in the lens barrel 14 perpendicular to the main optical axis direction. The members 14a and 14b constituting the lens barrel 14 are engaged by linear motion means using a cylindrical cam, and are configured to be movable in the main optical axis direction by a rotation operation of a drive motor (not shown). In addition, a CCD (not shown) is disposed in the imaging position of the lens 13 inside the camera body 12, and a subject is imaged by this CCD. The lens barrel 14 is expanded and contracted to change the distance between the lenses in the barrel, thereby changing the focal length of the photographic optical system and changing the image magnification (zoom) of the subject imaged by the CCD. It is possible.
[0022]
The microphone 22 is provided in front of the camera body 12, and outputs the collected sound signal to an A / D converter (not shown) built in the camera body 12, and is compressed / compressed as sound data (digital data). The data can be output to a smart medium (recording medium) (not shown) via a decompression circuit (not shown). Reference numeral 24 denotes a media slot cover (slot cover) for storing the smart media in the camera body 12.
[0023]
2, a finder as reference numeral 30, a power button as reference numeral 32, a cursor switch composed of cross buttons 35, 35... As a reference numeral 34, and a liquid crystal monitor as a reference numeral 36.
[0024]
The power button 32 is an operation unit for operating power on / off of the digital camera 10.
[0025]
The cross buttons 35, 35... In the cursor switch 34 are multi-function operation units capable of inputting instructions in four directions, left, right, up, and down. It functions as a button, a frame advance button, etc., and the up key and down key are used as zoom keys for magnification adjustment in the shooting mode. In the audio playback mode, the left key and the right key are used as a fast forward button / rewind stop button, and the up key and the down key are used as a playback button / stop button.
[0026]
The status display unit 40 is provided on the back surface of the camera body 12 and is disposed adjacent to the cursor switch 34. The status display unit 40 is for displaying information on the camera state, shooting mode, etc. (so-called shooting status). For example, the number of frames that can be shot (shootable time for moving images), recording image quality (quality) display, The number of pixels, built-in battery remaining amount check display, strobe flashing display, etc. are displayed.
[0027]
A liquid crystal monitor 36 is provided below the status display unit 40, and displays a photographed image / moving image immediately before photographing, or can be used as an electronic viewfinder for checking an angle of view at the time of photographing. The liquid crystal monitor 36 is attached to the camera body 12 via a monitor base 38. The monitor base 38 is attached to the camera body 12 via hinges 39, 39 provided on the side of the camera body 12, and the monitor base 38 can be opened and closed with respect to the camera body 12 using the hinges 39, 39 as fulcrums. It is said. Thereby, when the monitor base 38 is opened, the display surface of the liquid crystal monitor 36 can be positioned on the front side of the camera body 12 as shown in FIG. The angle of view can also be confirmed. The liquid crystal monitor 36 can also display a preview image of a captured image / moving image or an image / moving image read out from smart media. Further, the contents of various setting items in each menu can be displayed using the display screen of the liquid crystal monitor 36.
[0028]
With the digital camera 10 having such a configuration, an image is taken by a photographer pressing the shutter button 16. The optical image of the subject imaged by the CCD is converted into image data (may be digital data or moving image data) by an image processing board (not shown) built in the camera body 12, and the obtained image data is compressed / decompressed. It is compressed through a circuit and written and recorded on smart media in a media slot. Note that the sound collected by the microphone 22 by the pressing operation of the shutter button 16 is also recorded as audio data on the smart media for a predetermined time together with the image data.
[0029]
The digital camera 10 has an audio playback function for playing back music files such as MP3 format recorded on smart media. When the mode dial 17 is set to the audio playback mode and the playback button (up key consisting of the cross button 35) is pressed, the music file is read from the smart media via the compression / decompression circuit. Of course, it is assumed that music files are downloaded directly from a personal computer to smart media. Further, when the digital camera 10 is provided with a digital terminal, the music file may be downloaded via the digital terminal. The read music file is decompressed into audio data via a compression / decompression circuit, converted into an analog signal by a D / A converter (not shown), amplified by an amplifier (not shown), and then a binding string described later. 58 is output to the output wiring inside.
[0030]
In addition, a control board (not shown) that comprehensively controls the digital camera 10 and a charging battery (not shown) that supplies power to each device are provided inside the camera body 12. Further, the camera body 12 is provided with an audio / video output (A / V OUT) terminal, a digital (USB) terminal, and a power input terminal as devices (not shown), and communicates with external devices other than the digital camera 10. Alternatively, the charging battery can be charged by supplying power to the charging battery inside the digital camera 10, but detailed description thereof will be omitted.
[0031]
As shown in FIG. 1, the lens cap 50 mainly includes a cap 52 and a speaker unit 54.
[0032]
The cap 52 is formed so as to cover the front surface of the lens barrel 14 when the lens barrel is contracted to the camera body 12 (broken line in FIG. 1). A bayonet mechanism (not shown) is provided inside the cap 52, and a lens mount portion 15 is formed on the front surface of the camera body 12 along the circumference of the lens barrel 14. When the bayonet mechanism and the lens mount portion 15 are engaged, the lens cap 50 is detachably attached to the camera body 12 (lens barrel 14). It should be noted that release buttons 56 and 56 for releasing the engagement of the bayonet mechanism are provided on the collar portion of the lens cap 50, and the lens cap 50 is removed from the camera body 12 by pressing these release buttons 56 and 56. Can be removed.
[0033]
As shown in FIG. 3, the speaker unit 54 is disposed at the center of the cap 52. The sound source portion of the speaker unit 54, that is, the diaphragm 55 has a circular cross section, and has a cone shape that spreads toward the front of the camera body 12. A magnet 60 is attached to the rear side (camera body 12 side) of the diaphragm 55, and a coil (not shown) is disposed around the magnet 60. The shape of the diaphragm 55 is not limited to the cone shape, and may be formed in a disc shape. Moreover, the code | symbol 57 shown in the figure is a protection net | network for protecting the diaphragm 55 from the outside.
[0034]
The lens cap 50 is connected to the camera body 12 by a tie cord 58. As shown in the figure, the tying string 58 is provided so as to protrude from the side surface of the lens cap 50 and is connected to the side surface of the camera body 12 to prevent the lens cap 50 from being lost. Here, the tying string 58 has an output wiring (not shown) for outputting the speaker inside, and one end of the output wiring is connected to the amplifier inside the camera body 12. The circuit is connected, and the other end is connected to a coil disposed around the magnet 60.
[0035]
When the lens barrel 14 is stored, the front position of the member 14b is stored in the inner direction of the camera body 12 with respect to the front position of the member 14a of the lens barrel 14, as shown in FIG. When a lens cap is attached to the lens barrel 14, a predetermined gap can be obtained behind the speaker unit 54 (that is, around the diaphragm 55).
[0036]
Next, the operation of the digital camera 10 configured as described above will be described.
[0037]
The power button 32 shown in FIG. 2 is pressed to turn on the power of the digital camera 10, and then the mode dial 17 is operated so that the exposure and focus are automatically controlled. One of the reproduction modes for reproducing the selected image / moving image by the liquid crystal monitor 36 is selected.
[0038]
When the photographing mode is selected by the mode dial 17, the subject is imaged by the CCD by pressing the shutter button 16 by the photographer. At this time, a through image is displayed on the liquid crystal monitor 36, and the photographer can take a picture while looking at the liquid crystal monitor 36. Along with shooting, focusing (focusing) and exposure control are performed by the control board, the optical image of the subject imaged by the CCD is converted into image data, and the obtained image data is written to the smart media in the media slot Is recorded. Further, if the up and down keys of the cross buttons 35, 35... On the cursor switch 34 are pressed, the lens barrel can be moved in the main optical axis direction, and zoom photography can be performed by changing the magnification. . The image data obtained at this time may be recorded in the memory of the control board. Further, when the shutter button 16 is pressed, the sound collected by the microphone 22 (see FIG. 1) is recorded as sound data together with the image data.
[0039]
When the playback mode is selected by the mode dial 17, image data is read from the smart media via the compression / decompression circuit, and the captured image / moving image is displayed on the liquid crystal monitor 36. At this time, if audio data is recorded along with the image / moving image, the audio data corresponding to the image / moving image is read from the smart media, decompressed via the compression / decompression circuit, and D / A After being converted into an audio signal by the converter and amplified by the amplifier, it is output to the coil through the output wiring of the tying string 58. When an audio signal flows through the coil, the magnet 60 vibrates, and accordingly the diaphragm 55 coupled to the magnet 60 vibrates. As a result, sound is output from the speaker unit 54.
[0040]
Therefore, the image displayed on the liquid crystal monitor 36 can be confirmed while listening to the sound output from the speaker unit 54. The monitor base 38 is provided so as to be opened and closed with respect to the camera body 12, so that if the display surface of the liquid crystal monitor 36 is positioned on the front side of the camera body 12 as shown in FIG. A person can confirm the display surface of the liquid crystal monitor 36 from the front of the camera body 12 and can reproduce a realistic image / moving image together with sound from the speaker unit 54.
[0041]
When the mode dial 17 is set to the audio playback mode and the playback button (up key composed of the cross button 35) is pressed, the music file is read from the smart media through the compression / decompression circuit. The read music file is decompressed into audio data via a compression / decompression circuit, converted into an audio signal by a D / A converter, amplified by an amplifier, and then output via an output wiring inside the tying string 58. Output to the coil. When an audio signal flows through the coil, the magnet 60 vibrates, and accordingly the diaphragm 55 coupled to the magnet 60 vibrates. As a result, sound (music) is output from the speaker unit 54. Here, as compared with a speaker built in a conventional digital camera, the speaker portion 54 can be provided with a large diameter by providing the lens cap 50 with the speaker portion 54, thereby obtaining a sound quality with a wide sound range. Is possible. Further, as shown in FIG. 3, since the member 14b is stored in the inner direction of the camera body 12 with respect to the member 14a of the lens barrel 14, when the lens cap is attached to the lens barrel 14, A predetermined gap can be obtained behind the speaker unit 54, and a powerful sound quality in which a deep bass is increased by the baffle effect obtained thereby can be expected.
[0042]
As described above, according to the digital camera 10 according to the embodiment of the present invention, the speaker portion 54 is provided on the lens cap 50 that is detachably attached to the front portion of the lens barrel 14. A large diameter can be obtained, and a baffle effect can be obtained using the lens barrel 14 to improve sound quality.
[0043]
Also in a digital camera having a music playback function for playing back an audio signal recorded on a recording medium in the camera body 12, the lens cap 50 that protects the lens 13 is provided with a speaker, so that the speaker diameter can be increased. In addition, the baffle effect using the lens barrel 14 can be obtained and the sound quality can be improved.
[0044]
Further, the lens cap 50 and the camera body 12 are connected by a tying cord 58 for preventing the lens cap 50 from being lost, and the tying cord 58 is provided with output wiring for audio output of the speaker unit 54. Therefore, the lens cap 50 and the camera body 12 can be connected by the output wiring to prevent the lens cap 50 from being lost. Further, in addition to the tie cord 58, a separate new output wiring is not required, whereby the output wiring of the speaker unit 54 can be easily configured.
The configuration of the digital camera 10 shown in the above embodiment is not limited to the above embodiment.
[0045]
For example, as shown in FIG. 3, the male cap contacts 90, 90... Constituting the speaker output circuit are provided on the back surface of the lens cap 50, and the front side of the lens barrel 14 (member 14a) of the camera body 12 is provided. If the speaker female contacts 91, 91... Are provided at positions facing the speaker male contacts 90, 90..., The output wiring provided in the tie cord 58 can be omitted.
[0046]
In the present embodiment, the digital camera 10 that does not require lens replacement has been described as an example. The present invention can also be applied to.
[0047]
Next, another embodiment of the present invention will be described.
[0048]
FIG. 4 is a perspective view of a digital camera 10 according to another embodiment of the present invention. 4 that are common to the example shown in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.
[0049]
The digital camera 10 shown in FIG. 4 is provided with a speaker 96 in the camera body 12, and this built-in speaker (hereinafter referred to as an internal speaker) 96 and the speaker portion of the lens cap 50 (hereinafter referred to as an external speaker). ) 54 can be selectively used. FIG. 4 shows an example in which the internal speaker 96 is disposed on the front surface of the camera body 12, but the location of the internal speaker 96 is not limited to the example shown in FIG. There may be.
[0050]
FIG. 5 is a block diagram showing the internal configuration of the digital camera 10. In the figure, a central processing unit (CPU) 100 functions as a control unit that performs overall control of the camera system, and also functions as a calculation unit that performs various calculations such as an AE calculation and an AF calculation.
[0051]
A ROM 104 connected to the CPU 100 via the bus 102 stores programs executed by the CPU 100 and various data necessary for control. The memory (RAM) 106 is used as a program development area and a calculation work area for the CPU 100, and is also used as a temporary storage area for image data and audio data. Note that the ROM 104 which is a nonvolatile storage means may be non-rewritable or may be rewritable like an EEPROM.
[0052]
The operation unit 108 of the digital camera 10 is a block including input operation means such as the menu / OK button 109 and the cancel button 110 in addition to the shutter button 16, the mode dial 17, the power button 32, and the cross button 35 described above.
[0053]
The menu / OK button 109 has a function as a menu button for instructing to display an operation menu on the screen of the liquid crystal monitor 36 and a function as an OK button for instructing confirmation and execution of the selection contents. Operation key. The cross button 35 functions as a button (cursor moving operation means) for selecting an item from the menu screen or instructing selection of various setting items from each menu. The cancel button is used to delete a desired object such as a selection item, cancel an instruction content, or return to the previous operation state.
[0054]
A signal from the operation unit 108 is input to the CPU 100, and the CPU 100 controls each circuit of the digital camera 10 based on the input signal. For example, lens drive control, shooting operation control, image processing control, and image data recording / playback control are performed. The display control of the liquid crystal monitor 36 is performed.
[0055]
The digital camera 10 also has a remote control terminal 112 including an audio output terminal, and a remote control device with headphones (not shown) can be connected to the remote control terminal 112. The remote control device includes a switch unit such as an audio play / stop button, a forward / back button, a volume adjustment button, and an LCD panel. When the switch unit of the remote control device is operated, a command signal corresponding to the operation is sent to the CPU 100 of the digital camera 10, and processing corresponding to the instruction is performed. ,
As the power source of the digital camera 10, an external power source such as an AC power adapter connected to the battery 114 or a power input terminal (not shown) can be used. The power supplied from the battery 114 or the like is converted into a required voltage by a power supply circuit 115 including a DC / DC converter and supplied to each circuit block.
[0056]
The digital camera 10 is provided with an attachment detection sensor 117 that detects the attachment state of the lens cap 50 including the external speaker 54, and a detection signal of the attachment detection sensor 117 is sent to the CPU 100. The CPU 100 controls the switching circuit 118 in accordance with the detection signal received from the attachment detection sensor 117, and performs a process of automatically selecting the speaker used for audio output as either the external speaker 54 or the internal speaker 96.
[0057]
Next, the photographing function of the digital camera 10 will be described.
[0058]
When the shooting mode is selected by the mode dial 17, power is supplied to the imaging unit including the CCD 120, and the camera is ready for shooting. The lens 13 is electrically driven by a motor 123 via a motor driver 122 controlled by the CPU 100, and a zoom operation and a focus adjustment operation are performed.
[0059]
The light that has passed through the lens 13 is incident on the CCD 120 after the amount of light is adjusted by a diaphragm (not shown). A number of photodiodes (light receiving elements) are two-dimensionally arranged on the light receiving surface of the CCD 120, and red (R), green (G), and blue (B) primary color filters corresponding to the respective photodiodes. They are arranged in a predetermined arrangement structure (Bayer, G stripe, etc.).
[0060]
The CCD 120 has an electronic shutter function for controlling the charge accumulation time (shutter speed) of each photodiode. The CPU 100 controls the charge accumulation time in the CCD 120 via a timing generator (not shown). Instead of the CCD 120, an image sensor of another type such as a MOS type may be used.
[0061]
The subject image formed on the light receiving surface of the CCD 120 is converted into a signal charge of an amount corresponding to the amount of incident light by each photodiode. The signal charge accumulated in each photodiode is sequentially read out as a voltage signal (image signal) corresponding to the signal charge based on a drive pulse given from the timing generator in accordance with a command from the CPU 100.
[0062]
The image signal output from the CCD 120 is sent to the analog processing unit 124. The analog processing unit 124 includes a correlated double sampling (CDS) circuit and an amplifier. Here, the R, G, and B signals for each pixel are sampled and held in the image signal input to the analog processing unit 124, amplified, and sent to the A / D converter 125. The A / D converter 125 converts the R, G, and B signals sequentially added from the analog processing unit 124 into digital signals and outputs them to the image signal processing circuit 126.
[0063]
The image signal processing circuit 126 includes a synchronization circuit (a processing circuit that interpolates a spatial shift of the color signal associated with the color filter array of the single CCD and converts the color signal into a simultaneous expression), a luminance / color difference signal generation circuit, It functions as image processing means including a gamma correction circuit, contour correction circuit, white balance correction circuit, and the like, and performs predetermined signal processing using the memory 106 in accordance with commands from the CPU 100.
[0064]
The RGB image data input to the image signal processing circuit 126 is converted into a luminance signal (Y signal) and a color difference signal (Cr, Cb signal) by the image signal processing circuit 126, and predetermined processing such as gamma correction is performed. Applied. The image data processed by the image signal processing circuit 126 is stored in the memory 106.
[0065]
When the captured image is output to the monitor, the image data is read from the memory 106 and transferred to the image reproduction processing circuit 127 via the bus 102.
[0066]
The data sent to the image reproduction processing circuit 127 is converted into a predetermined format signal for display (for example, an NTSC color composite video signal) via the image reproduction processing circuit 127 and the video encoding circuit 128, and thereafter. The data is output to the liquid crystal monitor 36 and the audio / video output terminal 130. The image data in the memory 106 is periodically rewritten by the image signal output from the CCD 120, and a video signal generated from the image data is supplied to the liquid crystal monitor 36. 36. The photographer can check the shooting angle of view from the video (through movie image) displayed on the liquid crystal monitor 36.
[0067]
The shutter button 16 is composed of a two-stroke switch having an S1 switch that is turned on when half-pressed and an S2 switch that is turned on when fully pressed.
[0068]
The CPU 100 performs automatic focus adjustment (AF) control and automatic exposure (AE) control in response to half-pressing of the shutter button 16 (S1 = ON), and upon detecting full-pressing of the shutter button 16 (S2 = ON), Start capturing image data for recording (main shooting).
[0069]
That is, the CPU 100 performs various calculations such as a focus evaluation calculation and an AE calculation based on the image data obtained from the CCD 120 in response to S1 = ON, controls the motor driver 122 based on the calculation result, and controls the motor 123. The lens 13 is driven to move to the in-focus position, while an iris driving unit (not shown) is controlled to set the aperture to an appropriate aperture value and to control the charge accumulation time of the CCD 120.
[0070]
The image data captured in response to the full press of the shutter button 16 is converted into a luminance / color difference signal (Y / C signal) by the image signal processing circuit 126 and subjected to predetermined processing such as gamma correction. Stored in the memory 106.
[0071]
The Y / C signal stored in the memory 106 is compressed according to a predetermined format by the compression / decompression processing circuit 132 and then recorded on the memory card 134 via the media control circuit 133. For example, a still image is recorded in JPEG (Joint Photographic Experts Group) format, and a moving image is recorded in motion JPEG format. The compression format is not limited to this example, and other formats such as MPEG may be used.
[0072]
In the digital camera 10 of this example, a memory card called smart media (trademark) is used as means for storing image data. However, the form of the recording medium is not limited to this, and a PC card, a compact flash, a magnetic disk, An optical disk, a magneto-optical disk, a memory stick, a magnetic tape, or the like may be used, and various media that can be read and written according to a system based on electronic, magnetic, optical, or a combination thereof can be used. A signal processing means and an interface corresponding to the recording medium to be used are applied. A configuration in which a plurality of media can be mounted regardless of different types or the same type of recording media may be adopted. The recording medium (internal memory) built in the digital camera 10 is not limited to the removable medium.
[0073]
The shutter button 16 is a means for giving an instruction to start recording a still image, and is also used as a video recording button (recording start / stop button) and a recording button (recording start / stop button) under the voice recorder mode. .
[0074]
When the digital camera 10 is set to the moving image mode, moving image recording with sound becomes possible. The recording operation starts when the shutter button 16 is pressed (S2 = ON), and when the shutter button 16 is pressed again (S1 = ON), the recording operation stops. The recording operation may be performed while the shutter button 16 is continuously pressed, and the recording may be stopped by releasing the pressing.
[0075]
The sound at the time of moving image shooting is detected by the microphone 22, and the detection signal (sound signal) is amplified by the amplifier 136 and then sent to the sound processing circuit 138. The audio processing circuit 138 is connected to the bus 102 and converts audio data into a predetermined signal format using the memory 106 in accordance with an instruction from the CPU 100. The sound data generated in this way is stored in the memory 106, compressed by the compression / decompression processing circuit 132 together with the image data, and then recorded on the memory card 134.
[0076]
When the digital camera 10 is set to the voice recorder mode, voice recording is possible. Recording is started when the shutter button 16 is fully pressed (S2 = ON), and then recording is stopped when the shutter button 16 is pressed halfway (S1 = ON). Thereby, the operation sound of the shutter button 16 is not recorded.
[0077]
The audio information input via the microphone 22 is input to the audio processing circuit 138 via the amplifier 136. The audio processing circuit 90 converts the input audio signal into a digital signal and converts it into a predetermined file format (for example, WAVE format). The audio data thus obtained is recorded on the memory card 134 via the media control circuit 133.
[0078]
When the playback mode is selected by the mode dial 17, the last frame file recorded on the memory card 134 is read via the media control circuit 133. When the file of the last frame is a still image file, the compressed data of the read image file is expanded into an uncompressed YC signal via the compression / decompression processing circuit 132.
[0079]
The expanded YC signal is converted into a display signal via the image reproduction processing circuit 127 and the video encoding circuit 128, and is output to the liquid crystal monitor 36 and also to the audio / video output terminal 130. Thus, the last frame image stored in the memory card 134 is displayed on the liquid crystal monitor 36, and a display device such as a television receiver (not shown) is connected to the audio / video output terminal 130. In this case, the last frame image is displayed on the display device.
[0080]
Thereafter, when the right key of the cross button 35 is pressed, the frame is advanced in the forward direction, and when the left key is pressed, the frame is advanced in the reverse direction. Then, the frame-positioned image file at the frame position is read from the memory card 134, and the image is reproduced and displayed on the liquid crystal monitor 36 in the same manner as described above.
[0081]
When the reproduction target file is a moving image file, the first frame of the moving image is displayed as a representative image, and a screen for accepting an instruction to start moving image reproduction is displayed. If the file to be played is an audio file (an audio file recorded in the voice recorder mode), a predetermined image (for example, a bitmap in which a design of a microphone is designed) indicating that the file is an audio file on the liquid crystal monitor 36. Background picture) is displayed, and a screen for accepting an instruction to start audio reproduction is displayed. When an instruction to start audio reproduction is input, an audio file is read from the memory card 134 and converted into an audio signal by the audio processing circuit 138. The audio signal generated by the audio processing circuit 138 is amplified via the amplifier 140 and sent to the external speaker 54 or the internal speaker 96 via the switching circuit 118. Thus, the sound is output from the external speaker 54 or the internal speaker 96 selected by the switching circuit 118.
[0082]
When a remote control device with headphones (not shown) is connected to the remote control terminal 112, the audio signal generated by the audio processing circuit 138 is sent to the remote control device with headphones via the remote control terminal 112, and the audio is output from the headphones. Is output as
[0083]
The audio playback function of the digital camera 10 is a function for playing back music files such as MP3 (MPEG-1 Audio Layer-III) format recorded on the memory card 134. It is assumed that the music file is downloaded into the memory card 134 directly from a personal computer, a music distribution terminal, or the like or via the USB connector 137.
[0084]
When the audio mode is selected by the mode dial 17, audio playback is possible. When a playback instruction is input from the remote control device or the like while the digital camera 10 is set to the audio mode, a music file is read from the memory card 134 via the media control circuit 133.
[0085]
The compressed data of the music file read from the memory card 134 is expanded into uncompressed music data via the compression / decompression processing circuit 132. The expanded music data is converted into an audio signal by the audio processing circuit 138. The audio signal generated by the audio processing circuit 138 is amplified by the amplifier 140 and then sent to the internal speaker 96 or the external speaker 54 via the switching circuit 118. In this way, the music file is reproduced and output as sound.
[0086]
When a remote control device with headphones (not shown) is connected to the remote control terminal 112, the audio signal generated by the audio processing circuit 138 is sent to the headphones via the remote control terminal 112, and the audio is output from the headphones. Is done.
[0087]
Note that the processing contents in the voice processing circuit 138 (voice recorder mode recording / playback processing, music file playback processing, etc.) are switched in accordance with a switching signal from the CPU 100.
[0088]
Next, the communication interface of the digital camera 10 will be described. The digital camera 10 includes a USB controller 139 and a USB connector 137 as means for transmitting and receiving data to and from a personal computer (PC) and other external devices. By connecting the digital camera 10 to a personal computer or the like using a USB cable (not shown), data can be exchanged between the two. The communication means is not limited to the USB system, and various communication interfaces such as IEEE1394 and Bluetooth can be applied regardless of wired or wireless.
[0089]
FIG. 6 is a block diagram showing a main configuration of the digital camera 10 described in FIG. As shown in FIG. 6, the external speaker 54 and the internal speaker 96 are connected to output terminals 118A and 118B of the switching circuit 118, respectively. An output line of an amplifier that amplifies the audio signal generated by the audio processing circuit is connected to the input terminal 118C of the switching circuit 118, and the connection destination of the movable contact piece 118D of the switching circuit 118 is switched according to a control signal from the CPU 100. It is done.
[0090]
A detection signal of the attachment detection sensor 117 that detects the attachment state of the external speaker 54 is input to the CPU 100, and the CPU 100 controls the switching circuit 118 in accordance with this detection signal.
[0091]
FIG. 7 shows a flowchart of automatic speaker selection processing. As shown in the figure, the CPU 100 first performs mode determination and determines whether or not the digital camera 10 is set to the reproduction mode (step S210). If the playback mode is set in step S210, the process proceeds to step S212, and the external speaker 54 is detected. The CPU 100 determines whether or not the external speaker 54 is attached based on the detection signal from the attachment detection sensor 117.
[0092]
In step S212, when it is determined that the external speaker 54 is attached to the camera body 12, the movable contact piece 118D of the switching circuit 118 is moved to the external speaker 54 side so that the external speaker 54 is used as an audio output destination ( A control signal for switching to the output terminal 118A) in FIG. 6 is output (step S214 in FIG. 7). As a result, the sound is output from the external speaker 54.
[0093]
On the other hand, when a mode other than the playback mode is set in step S210, the movable contact piece 118D of the switching circuit 118 is placed on the internal speaker 96 side (the output of FIG. 6) so that the internal speaker 96 is used as the audio output destination. A control signal for switching to the terminal 118B) is output (step S216 in FIG. 7). As a result, the sound is output from the internal speaker 96.
[0094]
In addition, when the attachment of the external speaker 54 is not detected in step S212, the process proceeds to step S216, and the internal speaker 96 is used.
[0095]
As described above, the external speaker 54 having an acoustic effect is not necessary when the normal camera is used, and is usually configured to reproduce sound using the internal speaker. In particular, when the user is ready to listen to the sound using the external speaker 54, the speaker to be used is automatically switched so that the sound is output from the external speaker 54.
[0096]
Therefore, by using the lens cap with the speaker, the user can obtain an acoustic effect and at the same time carry convenience.
[0097]
In FIG. 7, an example of automatically switching speakers used for audio output has been described. However, the user can provide operation means such as an operation switch for switching speakers or a user interface for selecting a speaker to be used on a menu screen. A configuration in which a speaker can be manually selected is also possible.
[0098]
【The invention's effect】
As described above, according to the digital camera of the present invention, the speaker cap is provided on the lens cap that is detachably attached to the front portion of the lens barrel and protects the lens, whereby the speaker diameter can be increased. The baffle effect can be obtained using a lens barrel, and the sound quality can be improved.
[0099]
In addition, in a digital camera having a music playback function for playing back an audio signal recorded on a recording medium in the camera body, since the lens cap for protecting the lens is provided with a speaker, the speaker diameter can be increased, Sound quality can be improved by obtaining a baffle effect using a lens barrel.
[0100]
Furthermore, since the lens cap and the camera body are connected by an output wiring for audio output of the speaker, loss of the lens cap can be prevented and the output wiring of the speaker can be easily configured.
[0101]
Further, according to the present invention, since the first speaker mounted on the lens cap and the second speaker built in the camera body can be selectively switched and used, high-quality sound can be used according to the application. At the same time it can be played, it is convenient to carry.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overview of a digital camera according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the back of an overview of the digital camera according to the embodiment of the present invention.
FIG. 3 is a perspective view showing details of a lens cap of the digital camera according to the embodiment of the present invention.
FIG. 4 is a perspective view of a digital camera according to another embodiment of the present invention.
5 is a block diagram showing the internal configuration of the digital camera shown in FIG.
FIG. 6 is a block diagram showing the main configuration of the digital camera described in FIG.
FIG. 7 is a flowchart showing a procedure for automatic speaker selection processing;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Digital camera, 12 ... Camera body, 14 ... Lens barrel, 22 ... Microphone, 50 ... Lens cap, 54 ... Speaker part (external speaker), 58 ... Tie (output wiring), 96 ... Speaker (internal speaker) , 100 ... CPU, 117 ... attachment detection sensor, 118 ... switching circuit

Claims (2)

In a digital camera equipped with an audio playback means for converting an audio signal into audio and outputting it,
A lens cap that is detachably attached to a front portion of a lens barrel provided in the camera body is provided with a first speaker, while a second speaker is built in the camera body, and the first speaker or the Speaker switching means for switching a speaker for audio output so as to selectively use one of the second speakers ;
An attachment detection means for detecting whether or not the lens cap provided with the first speaker is attached to the lens barrel;
The switching of the speaker switching means is controlled based on a detection signal from the attachment detection means, and the first speaker can be used when the lens cap is attached to the lens barrel. Control means for performing control to enable use of the second speaker when the lens cap is not attached to the lens barrel;
Digital camera comprising the. The digital camera according to claim 1, wherein the lens cap and the camera body are connected by an output wiring for audio output of the speaker.

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