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JP2005124045

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005124045
PROBLEM TO BE SOLVED: To provide a recordable digital camera capable of collecting sound
efficiently by a simple mechanism. SOLUTION: A first microphone 10 is provided on an outer
peripheral surface 5c of a lens barrel 5. When the lens hood 9 for limiting the incidence of light
rays from outside the shooting angle of view is mounted on the shooting lens 6, the sound from
the subject side is reflected by the inner surface 9a of the lens hood 9 and received by the first
microphone 10. Let's do it. The voice of the subject can be efficiently acquired by the first
microphone 10. Furthermore, it is preferable to have a second microphone 19 for acquiring the
voice of the photographer. [Selected figure] Figure 1
デジタルカメラ
[0001]
The present invention relates to a recordable digital camera.
[0002]
Some digital cameras that capture a still image with a CCD image sensor or the like and store the
image data in a memory have a function of recording an appropriate message as audio data
before and after imaging.
Recently, digital cameras that can capture not only still images but also moving images have been
commercialized, and it is possible to record the sound from the subject side while capturing
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moving images.
[0003]
A microphone is built in the digital camera to obtain audio data. In order to record a
photographer's message, it is sufficient to incorporate a microphone in an appropriate part of the
camera body, but for example, to pick up sound from the subject side when shooting a moving
image, a microphone is provided on the front side of the camera body There is a need. In the
camera described in Patent Document 1, the camera body is pivotally attached to the front end of
the lens barrel so as not to be incorporated directly into the camera body so that driving noise of
the camera is not picked up as noise. The microphone is built in the lens cap.
[0004]
Japanese Patent Application Publication No. 09-009122
[0005]
Although the method described in Patent Document 1 has an advantage that vibration sound
from the camera body is not picked up as noise, a structure for pivotally attaching the lens cap to
the front end of the lens barrel and its use A mechanism for positioning the lens cap is required
so that the microphone is correctly directed to the subject side, which complicates the structure
and increases the cost.
In addition, by simply incorporating a microphone in the lens cap, a sufficient sound collection
effect can not be obtained, and the volume picked up by the microphone tends to be reduced as
the subject distance increases. Furthermore, since the lens cap remains open at the tip of the lens
barrel at the time of shooting, it is not very preferable in terms of design, and the lens cap is an
obstacle when operating the camera, etc. There is also a disadvantage in terms of operability.
[0006]
The present invention has been made in consideration of the above, and it is an object of the
present invention to provide a digital camera capable of efficiently picking up and recording
sound from the subject side, and also advantageous in terms of appearance design and
operability. Do.
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2
[0007]
In order to achieve the above object, in the digital camera according to the present invention, the
first microphone is provided on the outer peripheral surface of the lens barrel extended from the
camera body to limit the incidence of light rays from outside the photographing angle of view to
the photographing lens. When the lens hood is attached, the sound from the subject side is
reflected on the inner surface of the lens hood and received by the first microphone to enhance
the sound collection effect.
[0008]
It is also effective to provide a second microphone on the back of the camera body to receive the
voice emitted by the photographer so that the photographer's message can be recorded easily.
Furthermore, when the digital camera can be switched between the still image shooting mode
and the moving image shooting mode, it is effective to enable the first microphone in conjunction
with the switching to the moving image shooting mode.
[0009]
When the lens barrel is fixed to the camera body and is movably incorporated in the optical axis
direction inside a fixed barrel provided with the mounting portion for the lens hood, the lens
barrel is collapsed when the lens barrel is retracted into the fixed barrel. The first microphone is
stored in the storage position inside the fixed barrel, and furthermore, the first microphone is
made movable between the voice acquisition position where the first microphone protrudes from
the outer peripheral surface of the lens barrel and the storage position. It is preferable to move
the sound acquisition position to the storage position in synchronization with the retraction of
the tube into the fixed tube in order to protect the microphone and improve the appearance
design.
[0010]
According to the present invention, it is possible to provide a digital camera which is simple in
appearance and simple in appearance and capable of efficiently recording collected sound.
[0011]
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In FIG. 1 showing the appearance of the digital camera, a strobe light emission window 3 and a
fixed barrel 4 are provided on the front of the camera body 2.
A lens barrel 5 which can be moved back and forth in the optical axis direction is incorporated in
the fixed barrel 4 and, in use, is extended to a use position as illustrated.
When the power switch (not shown) is turned off, the front end surface 5a of the lens barrel 5 is
retracted to a position substantially coincident with the front end surface 4a of the fixed barrel 4
and is in a retracted state.
A lens group 6 constituting a zoom lens is incorporated in the lens barrel 5. When a zooming
operation is performed, the variable power lens moves inside the lens barrel 5 to perform
zooming and the lens barrel itself does not move. Further, even when focusing is performed, the
focusing lens moves inside the lens barrel, and the lens barrel itself does not move.
[0012]
A screw thread is formed on the tip inner circumference 4b (see FIG. 2) of the fixed barrel and
the lens hood end outer periphery 9b, and the lens hood 9 can be mounted by screwing. The lens
hood 9 restricts unnecessary light rays from outside the photographing angle of view from
entering the lens group 6, and prevents the occurrence of ghosts and flares. Since the lens hood
9 is mounted on the fixed barrel 4, the lens barrel 5 is in a state where the outer periphery 5 c is
encased by the lens hood 9 even at the projecting position thereof. Further, the lens barrel can be
retracted to the retracted position even with the lens hood 9 attached to the fixed barrel.
[0013]
The first microphone 10 is provided in the lens barrel 5 so as to protrude from the outer
peripheral surface 5 c. As shown in FIG. 2, the first microphone 10 is rotatably incorporated in
the lens barrel 5 by pivotally attaching the microphone protection cover 11 with the shaft 12,
and is biased toward the illustrated voice acquisition position by the spring 13. It is done. When
the lens barrel 5 moves to the retracted position, the microphone protection cover 11 abuts
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4
against the inner wall 4c of the fixed barrel, and is pushed into the storage position against the
bias of the spring 13. A signal line 14 from the first microphone 10 is drawn along the lens
barrel 5 to the camera body side, and an A / D conversion circuit 43 (see FIG. 4) connected to an
audio data processing circuit 44 (see FIG. 4). 4) connected.
[0014]
The lens hood 9 is supplied as a dedicated accessory of this digital camera, and has a parabolic
shape as a whole. Then, when used, as shown by a broken line in FIG. 2, the sound from the
subject side is reflected by the parabolic hood inner surface 9 a and efficiently directed to the
first microphone 10. In the illustrated example, one first microphone 10 is provided above the
outer peripheral surface 5c of the lens barrel, but may be provided on the left and right or below
the outer peripheral surface 5c as long as they have substantially the same circumference. You
may provide.
[0015]
Further, as shown in FIG. 3, on the upper surface 2d of the camera body, there is a release button
17 which is pressed during shooting, and an operation unit 18 which is operated by a
photographer when switching shooting modes and performing various setting operations. A
second microphone 19 is provided from the top surface 2d to the back surface (not shown). The
second microphone 19 is used when the photographer records a message or the like. The signal
line 20 (see FIG. 4) connected to the second microphone is, like the first microphone, connected
to the A / D conversion circuit 43 (see FIG. 4) connected to the audio data processing circuit 44
(see FIG. 4).
[0016]
A liquid crystal panel 21 on which a photographed image is displayed, a recording button 22
used when acquiring a sound, and a power switch 23 are provided on the back of the camera
body (not shown).
[0017]
FIG. 4 schematically shows the electrical configuration of this digital camera.
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Behind the photographing lens 6, a CCD image sensor 30 is disposed. The CCD image sensor 30
converts an optical subject image into an electrical imaging signal by driving of the CCD driver
31 and outputs it. The image pickup signal is amplified to an appropriate level by the amplifier
32 and then converted into digital data by the A / D conversion circuit 33 to generate image
data, which is input to the image data processing circuit 34. The image data processing circuit 34
generates a video signal based on the input image data, and outputs the video signal to the liquid
crystal control circuit 35. The liquid crystal control circuit 35 drives the liquid crystal panel 21 to
display an image based on the image data on the liquid crystal panel 21.
[0018]
The system control unit 36 is constituted by a microcomputer including a CPU, and controls the
photographing processing and the image display processing described above. When the release
button 17 is pressed, a command is sent to the memory control unit 40 to record image data on
the memory medium 41. The system control unit 36 also controls the operation of the first
microphone 10 and the second microphone 19 via the microphone drive circuit 42. The audio
information obtained from each microphone is digitized by the A / D conversion circuit 43, and is
recorded on the memory medium 41 through the audio data processing circuit 44, the system
control unit 36, and the memory control unit 40.
[0019]
The system control unit 36 sends a command according to the setting state by the operation unit
18 to the microphone drive circuit 42, thereby selectively activating the first microphone 10 and
the second microphone 19. In the normal still image shooting mode, only the second microphone
19 is activated, and within a predetermined time after recording the image data of the still image,
the message the photographer spoke while pressing the record button 22 is the still image It is
recorded on the memory medium 41 in association with the image data. In the moving image
shooting mode, only the first microphone 10 is validated during the moving image shooting
period, and the sound from the subject side can be recorded in the memory medium 41 in
association with the image data of the moving image. Note that the second microphone 19 may
also be enabled under the moving image shooting mode.
[0020]
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Hereinafter, the operation of the above configuration will be described. First, when the power
switch 23 is turned on in the still image shooting mode and the moving image shooting mode,
the lens barrel 5 is extended from the retracted position to the use position. At that time, the first
microphone 10 is moved from the storage position to the voice acquisition position by the
biasing of the spring 13.
[0021]
When the lens barrel 5 is extended to the use position, the autofocus device operates, and the
focus lens is moved and adjusted in the lens barrel while evaluating the contrast of the image
based on the image pickup signal from the CCD image sensor 30 for focusing. Is done. The
photographed image is displayed on the liquid crystal panel 21 as a through image. When the
power switch 23 is turned on in the reproduction mode, the lens barrel 5 remains in the
retracted position, and the liquid crystal panel 23 displays a menu for reproduction.
[0022]
When the still image shooting mode is set, when the release button 17 is pressed, the image data
obtained at that time is written to the memory medium 41. After recording, when the record
button 22 is pressed, the second microphone 19 can be used to record a message. The audio data
is recorded on the memory medium 41 in association with the image data.
[0023]
On the other hand, when the moving image shooting mode is set, shooting / recording is started
by pressing the release button 17 and continues until the moving image shooting stop button
provided on the operation unit 18 is operated. If the release button 17 is pressed during moving
image shooting, image data of a still image at that time can also be stored in the memory medium
41.
[0024]
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At the time of moving image shooting, the first microphone 10 is activated to collect sound from
the subject side. Since the sound from the subject side is directed to the first microphone 10 by
the inner surface 9a of the lens hood in parabolic shape, it is efficiently collected and recorded.
The recorded voice is recorded on the memory medium 41 in association with the image data.
[0025]
After the moving image shooting, the second microphone 19 can be used to record the
photographer's message as necessary. Since the audio data is recorded in the memory medium
41 in association with the image data of the recorded moving image, the sound as well as the
moving image can be reproduced at the time of reproduction.
[0026]
When the power switch 23 is turned off, the operation of the CCD image sensor 30 and the liquid
crystal panel 21 is stopped, and the lens barrel 5 is retracted from the use position to the
retracted position. During the movement of the lens barrel 5 to the retracted position, the fixed
barrel 4 pushes the first microphone 10 against the bias of the spring 13, so that the lens barrel
5 is reliably retracted to the retracted position.
[0027]
In the present embodiment, the example in which the lens barrel 5 is stopped only at the two
positions of the retracted position and the use position has been described, but may be stopped
at a plurality of positions according to the zooming operation. In this case, if the first microphone
10 approaches the focus of the parabolic shape of the inner surface 9a of the lens hood as the
lens barrel 5 is moved to the tele-side position, voice can be efficiently acquired.
[0028]
In the present embodiment, the fixed barrel 4 is provided to protrude on the front surface of the
camera body 2, but the fixed barrel 4 is not necessarily required. When the fixed barrel 4 is not
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used, only the opening may be provided in the camera body 2, the lens barrel 5 may be advanced
and retracted through the opening, and the lens hood 9 may be attached to the edge of the
opening.
[0029]
In the present embodiment, although the first muscle 10 moves the voice acquisition position
and the storage position by the spring 13, the first microphone 10 may be moved by an electric
drive source such as a motor.
[0030]
FIG. 3 is an external perspective view of the digital camera embodying the present invention in a
state in which the lens barrel has been extended to the use position.
FIG. 1 is a cross-sectional view of the main part of a digital camera embodying the present
invention. FIG. 2 is an external perspective view of the digital camera according to the present
invention, in which the lens barrel is in a retracted state. It is a block diagram which shows the
electric constitution of a digital camera.
Explanation of sign
[0031]
Reference Signs List 2 camera body 4 fixed barrel 5 lens barrel 5c outer peripheral surface 6
shooting lens 8 lens barrel 9 lens hood 9a lens hood inner surface 10 first microphone 19
second microphone
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