JP2009253676A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that noise, which is generated inside an imaging apparatus, may be recorded together during audio recording. <P>SOLUTION: In an imaging apparatus, a noise recording microphone 16 is placed in contact with a mirror box 2 that contacts a lens unit which is a noise source. Therefore, a noise component generated inside the imaging apparatus and collected by the noise recording microphone is subtracted from audio input through a sound collection opening provided on a camera exterior into an audio recording microphone 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an imaging apparatus, and more particularly to an imaging apparatus capable of recording audio.

  In recent electronic cameras, it is relatively easy to record and play back simple moving images as the price of semiconductor memory as a recording medium is reduced and the signal processing speed in the camera is increased. It has become to. In view of this, some electronic cameras that have become popular in recent years include not only a still image and moving image recording and playback function, but also an audio information recording and playback function. In an electronic camera having such a configuration, a still image, a moving image, and audio information are generally converted into electrical signals and then recorded on a predetermined recording medium as data in a predetermined form. It is. When using a microphone, which is an audio input means, in an electronic camera, for example, when performing simultaneous recording when recording a moving image, or as a memorandum regarding a still image during still image recording or within a predetermined time immediately after recording a still image. For example, a simple voice recording (so-called voice memo) is performed.

  By the way, in general electronic cameras, various operating sounds are generated when performing a photographing operation. When performing a shooting operation with a general electronic camera, zooming operation and driving control of a part of the shooting lens are performed by appropriately moving a part of the frame member that holds multiple shooting lenses in the direction of the optical axis. By doing so, a focusing operation or the like can be executed. When performing these photographing operations, when the driving sound generated from the driving motor itself or driving force transmitting means for transmitting the driving force of the driving motor, the moving frame member holding the photographing lens, or the like moves. This causes mechanical operating noise such as sliding noise.

  In addition, a general photographic lens that is detachably attached to a single-lens reflex electronic camera (hereinafter referred to as a digital single-lens reflex camera) has a plurality of apertures that continuously adjust the diameter of a light bundle incident on the photographic lens. A diaphragm mechanism composed of blades is incorporated. The aperture diameter of the aperture is changed by rotating an aperture ring provided in the lens barrel or controlling the aperture ring with an electronic dial of an electronic camera. When performing the diaphragm operation, the driving sound generated from the driving motor itself for driving the diaphragm blades, the driving force transmission means for transmitting the driving force of the driving motor, the friction sound generated by rubbing the diaphragm blades, etc. Will occur.

  Also, in general electronic cameras, operation members such as a release button for instructing start of shooting, a zoom button for instructing zooming operation of a lens, and an electronic dial for changing setting items are arranged on the exterior of the camera body. ing. When operating these operation members, the operation sound generated from the operation mechanism transmits the exterior of the camera body.

  Therefore, if the audio information is recorded at the same time when the photographing operation is executed, the above-described mechanical operation sound or the like may be input to the microphone. Such mechanical operating sound or the like is considered to be noise because it is a kind of audio information that the photographer does not want to record, and it is desired to reduce such noise when recording audio with an electronic camera.

  Therefore, when recording a moving image with an electronic camera having an audio recording function, the photographic lens is zoomed so that noises such as driving sounds, sliding sounds, and frictional sounds generated from the driving motor and driving force transmission means do not enter. The operation, the focusing operation and the diaphragm operation of the diaphragm mechanism are stopped or suppressed. Alternatively, they are operated by allowing noise to enter the voice.

  However, if the zooming operation or the focusing operation of the photographing lens is stopped or suppressed in order to avoid recording noise, there arises a problem that the photographing scene is limited. Further, when the zooming operation or focusing operation of the photographing lens is operated, the problem that noise is recorded cannot be solved.

Therefore, Patent Document 1 has first recording means for converting sound into an electric signal, and second recording means for converting noise generated from each driving device into an electric signal, and is obtained by the first recording means. There has been proposed an electronic camera that subtracts the noise component obtained by the second recording means from the received voice.
JP 2005-244613 A

  However, Patent Document 1 describes reduction of noise generated from zooming and zooming operation of the zoom lens and focusing operation of the photographing lens, but it is generated from an electronic camera such as an operating sound generated from the above-described operation mechanism. Other noise reduction is not considered.

  The present invention has been made to solve such a problem, and it is an object of the present invention to provide an imaging apparatus capable of performing voice recording with reduced noise generated in the imaging apparatus.

  An imaging apparatus according to the present invention is an imaging apparatus capable of audio recording, and includes a lens unit, a casing that contacts the lens unit, an exterior member provided with a sound collection opening, and the sound collection A first microphone that converts sound input through the opening into an electrical signal; and a second microphone that is disposed in contact with the housing and converts sound generated by the imaging device into an electrical signal. Signal processing means for subtracting and outputting a sound component generated in the imaging device from the electrical signal obtained by the first microphone using the electrical signal obtained by the second microphone. The first microphone is arranged closer to the sound collection opening than the second microphone.

  According to the present invention, it is possible to perform voice recording with reduced noise generated in the imaging apparatus.

(First embodiment)
FIG. 1 is a schematic vertical sectional view for explaining the basic configuration of a digital single-lens reflex camera according to a first embodiment of the present invention.

  Reference numeral 1 denotes a camera exterior (exterior member), 2 a mirror box (housing), and the mirror box 2 is provided with a mount 2a as a lens mounting portion, and the lens unit 3 is directly mounted on the mount 2a. Can do. The mirror box 2 is directly attached with a shutter 5, an AF sensor 8, a main mirror 4 and the like which will be described later. The mount 2a has an interface unit for communicating various signals with the lens unit 3 and supplying driving power.

  Reference numeral 3 denotes a lens unit that can be attached to and detached from the camera body. The lens unit 3 includes a lens group 3a including a focus lens group and a zoom lens group, and an aperture device 3b including a plurality of aperture blades. In FIG. 1, the focus lens group and the zoom lens group are shown as a single lens for the sake of convenience, but in reality, a large number of lenses are combined in a complex manner. The lens group 3 a and the diaphragm device 3 b are driven by a drive motor (not shown) built in the lens unit 3. The drive motor is electronically controlled from the camera body via the interface portion of the mount 2a.

  During the photographing operation, the driving sound of the driving motor, the mechanism sound generated by the driving force transmission mechanism such as a gear for transmitting the driving force of the driving motor to the lens group 3a and the diaphragm device 3b, and the plurality of diaphragm blades of the diaphragm device 3b rub against each other. The lens unit 3 generates noise such as frictional noise. Noise generated from the lens unit 3 is transmitted to the mirror box 2 from the mount 2a in contact with the lens unit 3, and the transmitted noise is collected by the noise recording microphone 16 (second microphone) in contact with the mirror box 2. To do. By arranging the noise recording microphone 16 in contact with a member to which the lens unit 3 as a noise generation source is directly attached in this manner, noise from the lens unit 3 can be more effectively obtained than in the case where the noise recording microphone 16 is arranged in another part. Sound can be collected. In other words, the noise recording microphone 16 can be directly attached to the mirror box 2 to collect sound while being in contact with the mirror box 2.

  Reference numeral 4 denotes a main mirror composed of a half mirror, which is rotatably attached to the mirror box 2. The main mirror 4 can be rotated according to the operating state of the camera. When the photographer confirms the subject image with the finder, the main mirror 4 is obliquely provided in the photographing optical path and guides the light beam from the lens unit 3 to a finder optical system described later. On the other hand, when photographing, the main mirror 4 is retracted from the photographing optical path, so that the light flux from the lens unit 3 is guided to the image sensor 6 described later without being reflected by the main mirror 4.

  Reference numeral 5 denotes a shutter for controlling the light beam from the lens unit 3 to enter an image sensor 6 described later. During moving image shooting, the shutter 5 is opened, and the light flux is incident on the image sensor 6. When still image shooting is performed, the shutter 5 is driven by a drive motor (not shown), and noise such as drive sound and mechanism sound is generated from the drive motor and a driving force transmission mechanism such as a gear that transmits the driving force to the shutter 5. . Noise generated by driving the shutter 5 is also collected by the noise recording microphone 16 via the mirror box 2 to which the shutter 5 is directly attached. Thus, by arranging the noise recording microphone 16 in contact with the member to which the shutter 5 as a noise generation source is directly attached, the noise from the shutter 5 can be collected more effectively than in the case where the noise recording microphone 16 is arranged at another part. Can sound.

  Reference numeral 6 denotes an image sensor using a CMOS sensor, which converts and accumulates a light beam transmitted through the lens unit 3 into an image signal.

  Reference numeral 7 denotes a sub-mirror that rotates together with the main mirror 4. When the main mirror 4 is obliquely arranged in the photographing optical path, the light beam that has passed through the main mirror 4 is guided to an AF sensor 8 described later. On the other hand, when the main mirror 4 is retracted from the photographing optical path, the sub mirror 7 is also retracted integrally with the main mirror 4 and guides the light flux to the image sensor 6 described later.

  Reference numeral 8 denotes an AF sensor, which includes a secondary imaging lens, an area sensor including a plurality of CCDs, and the like, and can detect a focus by a known phase difference method.

  Reference numeral 9 denotes a focusing plate disposed on the primary image forming surface of the lens unit 3. A Fresnel lens (condenser lens) is provided on the incident surface, and a subject image (finder image) is formed on the exit surface. .

  Reference numeral 10 denotes a finder optical path changing pentaprism that corrects a subject image formed on the exit surface of the focusing plate 9 into an erect image.

  Reference numerals 11 and 12 are eyepiece lenses. Here, an optical system including the focus plate 9, the pentaprism 10, and the eyepieces 11 and 12 is referred to as a finder optical system.

  Reference numeral 13 denotes an AE sensor, which is composed of photodiodes corresponding to the respective areas in the multi-divided shooting screen, and measures the luminance of the subject image formed on the exit surface of the focusing screen 9.

  A liquid crystal monitor 14 displays captured images and various types of shooting information.

  Reference numeral 15 denotes an audio recording microphone (first microphone) that collects audio around the camera and converts it into an audio signal during audio recording of the camera.

  The voice recording microphone 15 is fixed to a microphone housing portion provided in the camera exterior 1. A sound collection opening is provided on the outer surface of the microphone housing so that sound around the camera can be collected effectively. Note that by providing the sound collection opening at a position away from the noise recording microphone 16, it is possible to reduce the sound around the camera that is collected by the noise recording microphone 16. By reducing the sound around the camera included in the sound collected by the noise recording microphone 16, it is possible to effectively remove or reduce noise from the sound around the camera by the processing of the computing unit 23 described later.

  Further, since the wall of the microphone housing portion is provided as a sound insulating member between the sound collection opening provided in the camera exterior 1 and the noise recording microphone 16, the camera that collects sound in the noise recording microphone 16. Ambient voice can be further reduced. At this time, since the sound recording microphone 15 is arranged near the sound collection opening from the wall provided between the sound collection opening and the noise recording microphone 16, the sound around the camera is effectively used. Can be collected.

  Next, a specific configuration and operation for reducing noise generated during moving image shooting in the digital single-lens reflex camera according to the first embodiment of the present invention will be described with reference to FIG.

  FIG. 2 is a block diagram showing a part of the system configuration of the digital single-lens reflex camera in the first embodiment of the present invention.

  Audio signals obtained from the audio recording microphone 15 and the noise recording microphone 16 are digitally converted by an A / D converter (not shown) and input to the amplifiers 22 and 29 through the audio filters 21 and 28, respectively. Here, the sound filter 21 of the sound recording microphone 15 is set to a frequency characteristic suitable for sound, while the sound filter 28 of the noise recording microphone 16 is set to a frequency characteristic suitable for noise generated from a noise generation source. The gains of the amplifiers 22 and 29 are controlled to an appropriate level by the gain control circuit 27 and calculated by the calculator 23. The computing unit 23 is configured to subtract the input signal on the noise recording microphone 16 side from the input signal on the sound recording microphone 15 side. The signal processing circuit 24 converts the audio signal calculated by the calculator 23 into an audio file format and outputs it. The moving image signal acquired by the image sensor 6 is digitally converted by the A / D converter 30 and is associated with the sound signal in the memory controller 25 to become a moving image signal with sound. The moving image signal with sound is transmitted to a recording device 26 for writing on a recording medium such as a media card.

  As described above, the noise recording microphone 16 is placed in contact with the mirror box 2 to which the lens unit 3 and the shutter 5 as noise sources are directly attached. Therefore, the noise generated from the lens unit 3 and the shutter 5 can be collected more effectively than the case where it is arranged at another position, and the sound recording microphone is utilized using the noise collected by the noise recording microphone 16. The noise can be removed or reduced from the voice collected at 15.

  In the present embodiment, the noise recording microphone 16 is disposed in contact with the mirror box 2, but in a compact camera in which the diaphragm shutter is held in the lens barrel, the noise recording microphone 16 is attached to the lens barrel. A similar effect can be achieved by placing them in contact with each other.

  In addition, as long as a member that directly attaches a noise generation member, the same effect can be obtained even if the noise recording microphone 16 is placed in contact with a member other than the mirror box 2.

(Second embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the noise recording microphone is arranged at a position where not only the noise considered in the first embodiment but also the noise generated from the operation member used for the operation during voice recording can be collected effectively.

  First, the configuration of a digital single-lens reflex camera according to the second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a schematic longitudinal sectional view of a digital single lens reflex camera according to the second embodiment of the present invention. In FIG. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted, and only the parts having differences are described.

  The mirror box 32 of FIG. 3 has a front (subject side) portion extending upward as compared to the mirror box 2 of FIG. The noise recording microphone 46 is arranged in contact with the extended portion. The noise recording microphone 46 attached to the mirror box 32 is also arranged in contact with the camera exterior 31. Therefore, the noise recording microphone 46 is disposed so as to be sandwiched between the mirror box 32 and the camera exterior 31.

  The reason for this configuration is that the noise recording microphone 46 is disposed in a region where it can be in contact with the mirror box 32 and the camera exterior 31 and in the vicinity of an operation member used for an operation during moving image shooting. The operation members used for operations during moving image shooting include an electronic dial 47 for changing each setting item of the camera and a release button 48 for instructing start / stop of moving image shooting. Operation members such as the electronic dial 47 and the release button 48 are fixed to the camera exterior 31.

  Similar to the first embodiment, the noise recording microphone 46 is placed in contact with a member to which the lens unit 3 that is a noise generation source is directly attached, so that the lens unit 3 can be more effectively than in the case where it is arranged in another part. The noise generated from can be collected. Further, by placing the noise recording microphone 46 in contact with the camera exterior 31 to which the operation members such as the electronic dial 47 and the release button 48 are attached, the noise generated by the operation members is more effective than the case where the operation is performed in other parts. Can be collected.

Although the shape of the mirror box 32 is different from that of the mirror box 2, the mount 32a is arranged at the same position as the mount 2a of FIG.
Since there is a mirror box 32 at the position where the voice recording microphone 15 of FIG. 1 is disposed, the microphone storage section for storing the voice recording microphone 45 is provided at a position above the microphone storage section of FIG. Accordingly, the sound collection opening of the camera exterior 31 is also provided at a position above the sound collection opening of the camera exterior 1 of FIG. Since the wall of the microphone housing portion is provided between the sound collection opening provided in the camera exterior 31 and the noise recording microphone 46, the noise recording microphone 46 is disposed near the sound collection opening. Even in this case, the sound around the camera collected by the noise recording microphone 46 can be reduced.

  FIG. 4 is a front view of the digital single-lens reflex camera according to the second embodiment of the present invention with the photographing lens removed.

  As shown in FIG. 4, the noise recording microphone 46 is in direct contact with both the mirror box 32 and the camera exterior 31 and is close to the operation members used for operations during moving image shooting, such as the electronic dial 47 and the release button 48. Is arranged.

  Operation members such as the electronic dial 47 and the release button 48 are attached to the camera exterior 31, and the operation sound is transmitted to the camera exterior 31 when the operation member is operated during moving image shooting. The operation sound of the operation member transmitted through the camera exterior 31 is collected by the noise recording microphone 46 and converted into an audio signal. By placing the noise recording microphone 46 in contact with the camera exterior 31 where the operation member, which is a noise generation source, is arranged in this manner and arranging it near the operation member, it is more effective than the case where the operation member is arranged. Noise generated by the operation member can be collected.

  Reference numeral 49 denotes a lens release button that is operated when the lens unit 3 attached to the camera body is removed. Reference numeral 50 denotes an aperture button for performing aperture driving of the aperture mechanism 3b of the lens unit 3 when the photographer is observing a subject using the finder optical system when not photographing.

  The lens release button 49 and the aperture button 50 also generate noise during operation. However, the lens release button 49 and the aperture button 50 are operated during non-shooting and do not need to be used during moving image shooting. Therefore, the noise recording microphone 46 is placed at a position where noise generated from the electronic dial 47 and the release button 48 that are used more frequently during moving image shooting than the lens release button 49 and the narrowing button 50 can be effectively collected. It is arranged.

  Since the specific configuration and operation of noise reduction in the second embodiment of the present invention are the same as those in the first embodiment, description thereof will be omitted.

  As described above, the noise recording microphone 46 is arranged in contact with the mirror box 32 to which the lens unit 3 as a noise generation source is directly attached. Further, a noise recording microphone 46 is disposed in contact with the camera exterior 31 to which an operation member as a noise generation source is attached and in the vicinity of the operation member. Therefore, the noise generated by the lens unit 3 and the operation member can be collected more effectively than the case where it is arranged at another position, and the sound recording microphone is utilized by using the noise collected by the noise recording microphone 46. Noise can be removed or reduced from the voice collected at 45.

  Furthermore, only one noise recording microphone 46 is arranged to collect noise generated from the lens unit 3 and the operation member. Therefore, the number of components can be reduced and the mounting space can be reduced as compared with the case where one noise recording microphone 46 is arranged in each of the mirror box 32 to which the lens unit 3 is directly attached and the camera exterior 31 to which the operation member is attached. .

  In this embodiment, the electronic dial and the release button are used as operation members that are operated during moving image shooting. However, even if there are other operation members that are operated during moving image shooting, a noise recording microphone is provided in the vicinity thereof. By arranging 46, the same effect can be obtained.

  In the above-described two embodiments, a digital single-lens reflex camera having a replaceable lens unit has been described, but a lens-integrated digital single-lens reflex camera may be used.

  In addition, even if it is an operation other than movie shooting, if audio recording is possible and noise occurs from the imaging device due to the same factors as in movie shooting due to operations during voice recording, the noise generated by the imaging device will be reduced. Reduced voice recording can be performed.

It is the longitudinal cross-sectional schematic of the digital single-lens reflex camera in 1st embodiment of this invention. It is a block diagram which shows a part of system configuration | structure of the digital single-lens reflex camera in 1st embodiment of this invention. It is the longitudinal cross-sectional schematic of the digital single-lens reflex camera in 2nd embodiment of this invention. It is a front view of the state which removed the lens unit of the digital single-lens reflex camera in 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,31 Camera exterior 2,32 Mirror box 3 Lens unit 4 Main mirror 5 Shutter 6 Image sensor 7 Submirror 8 AF sensor 9 Focus plate 10 Pentaprism 11, 12 Eyepiece 13 AE sensor 14 Liquid crystal monitor 15, 45 Audio recording microphone 16, 46 Noise recording microphone 47 Electronic dial 48 Release button 49 Lens release button 50 Focusing button

Claims (7)

An imaging device capable of audio recording,
A lens unit;
A housing portion in contact with the lens unit;
An exterior member provided with an opening for sound collection;
A first microphone that converts sound input through the sound collection opening into an electrical signal;
A second microphone that is disposed in contact with the housing and converts sound generated by the imaging device into an electrical signal;
Signal processing means for subtracting and outputting a sound component generated by the imaging device from the electrical signal obtained by the first microphone, using the electrical signal obtained by the second microphone;
The first microphone is disposed closer to the sound collection opening than the second microphone. A sound insulation member between the sound collection opening and the second microphone;
The imaging apparatus according to claim 1, wherein the first microphone is disposed in the vicinity of the sound collection opening from the sound insulation member. The exterior member has a storage portion for storing the first microphone,
The imaging apparatus according to claim 2, wherein the storage section includes the sound collection opening on an outer surface. It has an operating member used for operations during audio recording,
The imaging apparatus according to claim 1, wherein the second microphone is disposed in the vicinity of the operation member. It has an operating member used for operations during audio recording,
The operation member is disposed on the exterior member,
The imaging apparatus according to claim 1, wherein the second microphone is disposed in contact with the exterior member.   The imaging apparatus according to claim 4, wherein the second microphone is disposed closer to the operation member than the first microphone. The lens unit is detachable from the casing.
The imaging apparatus according to claim 1, wherein the housing unit includes a lens mounting unit that directly mounts the lens unit.

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