JP2007043510A - Portable sound recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound recorder which is capable of recording sounds with satisfactory frequency characteristics and has microphones of which the direction can be arbitrarily adjusted in accordance with a direction of a sound source. <P>SOLUTION: Left and right microphones 27 and 28 are disposed on a housing of the sound recorder in a shape of inverted V character in the so-called XY type, and a turning frame 26 having the left and right microphones 27 and 28 attached thereto can be inclined forward at 30° and backward at 45°, whereby a stereophonic effect is enhanced and directivities to an object of sound recording can be adjusted. Guards 31 and 32 which are formed like arches in order to protect the left and right microphones 27 and 28 are attached onto the turning frame 26 and can be used for protection with respect to strength and be used as support means when placing the sound recorder with the rear side down. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable audio recorder, and more particularly to a portable audio recorder having a pair of left and right microphones.

  Audio recorders are widely used as means for recording audio. The sound recorder converts sound collected by a microphone into an electric signal and records the sound signal on a recording medium. In particular, a recording medium using the magnetic tape, the optical disk, or the semiconductor memory is widely used as the recording medium for the audio signal.

  Especially in portable audio recorders, if a microphone is embedded and attached to a part of the outer casing, external sound can be collected and recorded directly by this microphone. No longer need it. However, an audio recorder in which a single omnidirectional microphone is attached to a part of the housing cannot always realize recording with a desired frequency characteristic, and therefore, only reproduced sound with poor realism is reproduced. There is a problem to become.

  In the utility model registration No. 2558273, two microphone support rods made of elastic wires supporting the microphone body at the front end portion and the microphone cord at the rear end portion and one of the screwing means are formed. The base member, the first and second mounting portions in which rod mounting grooves for mounting the microphone support rod are formed, and the base member and the first mounting portion in a state where the microphone support rod is mounted in the rod mounting groove. There is disclosed a microphone support having a support rod fixing portion provided with the other screwing means for screwing into the one screwing means for fixing the first and second mounting members to the base member.

  According to such a microphone support, although the sound of the left and right channels can be recorded by the pair of microphones, the pair of microphones are disposed toward the opposite sides, so that There is a drawback that a so-called hollow-out phenomenon occurs in which the sound of the part is lost. In addition, the microphone attached by such a microphone support has a drawback that it is not always necessary to use it in combination with an audio recorder, and the handling thereof is complicated.

  Japanese Utility Model Laid-Open No. 51-84427 discloses that a microphone element is mounted on gears of the same diameter that are screwed together, a pinion is engaged with one of the gears, and the pinion is rotated to open the microphone element. In a stereo microphone whose angle is adjusted, a stereo microphone provided with means for regulating the opening angle of the microphone element is disclosed.

This microphone is also provided with a pair of microphone elements such that the tip ends of the axis lines of the left and right microphone elements are directed laterally. Therefore, it is not possible to prevent the hollowing out phenomenon in which the sound at the left and right intermediate portions is lost. Also, when using such a microphone in combination with an audio recorder, it must be connected to the audio recorder jack by a connector cable or jack, and the microphone may not be stable depending on the shape of the audio recorder housing. There is.
Utility Model Registration No. 2558273 Japanese Utility Model Publication No. 51-84427

  An object of the present invention is to provide a portable audio recorder capable of recording a high quality sound quality.

  Another object of the present invention is to provide a portable audio recorder capable of realizing a desired frequency characteristic.

  Still another object of the present invention is to provide a portable audio recorder capable of high-quality stereo recording with a pair of left and right microphones.

  Still another object of the present invention is to provide a portable audio recorder that can arbitrarily adjust the direction and angle of a microphone in accordance with the position of a sound source.

  Still another object of the present invention is to provide an audio recorder capable of recording with high sound quality without using an external microphone.

  Still another object of the present invention is to provide a portable audio recorder capable of stereo recording that avoids a hollow-out phenomenon in which the sound of the middle part of the left and right is lost when recording with a pair of left and right microphones. is there.

  The above-described problems and other problems of the present invention will be made clear by the technical idea of the present invention described below and the embodiments thereof.

The main invention of the present application is a portable audio recorder,
The present invention relates to a portable audio recorder characterized in that a pair of left and right microphones are arranged at the upper part of a casing so that their axis lines intersect and are rotatably attached in the front-rear direction.

  Here, the extension part of the axis line of a pair of right and left microphones may be arranged to intersect at an angle of about 90 degrees. Further, the angle at which the extended portions of the axis lines of the pair of left and right microphones may be adjustable. A pair of left and right microphones may be mounted on a movable table, and the movable table may be movable on a rail. A rotating frame may be rotatably attached to the upper part of the housing, and the pair of left and right microphones may be attached on the rotating frame. Moreover, an arm may be continuously provided on both sides of the upper portion of the housing so as to protrude upward, and the rotating frame may be attached to the arm via a hinge. Moreover, the said rotation frame may be rotated largely behind rather than the front side. In addition, a guard may be attached to the rotating frame, and the guard may be positioned on the tip side of the pair of left and right microphones to protect the microphone. The guard may have an arch shape, and may be attached to the front and rear on the rotating frame, and the front and rear guards may be connected by a connecting member. Moreover, it is good also as a support means when the guard is put down on the back side and placed with the back side down.

  The main invention of the present application is a portable audio recorder, in which a pair of left and right microphones are arranged at the upper part of a housing so that their axes intersect and are attached to be rotatable in the front-rear direction.

  Therefore, according to such a portable sound recorder, it is possible to record sound by collecting sound with a pair of left and right microphones provided at the top of the housing. In addition, since the pair of left and right microphones are arranged so that their axis lines intersect each other, it is difficult for intermediate sounds to come out, thereby enabling high-quality recording. Further, since it is rotatable in the front-rear direction, the angle of the microphone can be arbitrarily adjusted according to the direction of the sound.

  The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 and FIG. 2 show the appearance of a portable audio recorder according to the present embodiment, and this portable audio recorder includes an outer casing 10 having a flat rectangular parallelepiped shape. A pair of left and right level meters 11 and 12 are arranged on the front side of the outer casing 10. These level meters 11 and 12 are meters for displaying the recording levels of the left and right sounds. Below the level meters 11 and 12, a display unit 13 comprising a liquid crystal display panel is provided, and necessary display such as mode display is performed by the display unit 13. A plurality of operation buttons 14 are arranged below the display unit 13, and these operation buttons 14 enable mode selection and various other input operations.

  An adjustment knob 17 is provided on the left side surface of the housing 10. This adjustment knob 17 is for adjusting the sound level of the headphones connected via the jack. On the other hand, a pair of left and right recording volume knobs 19 and 20 are coaxially arranged on the right side of the housing 10 so that the left and right recording levels can be independently adjusted by the volume adjustment knobs 19 and 20. . In particular, as shown in FIGS. 1B and 2B, a lid 21 is attached to the right side surface of the housing 10, and the inside of the lid 21 is a slot 22 so that a semiconductor memory can be mounted through the slot 22. It has become.

  A rotating frame 26 is attached to the upper portion of the outer casing 10, and left and right microphones 27 and 28 are attached in an inverted V shape by the rotating frame 26. That is, the microphones 27 and 28 have their axis ends intersecting each other at an angle of 90 degrees. The rotation frame 26 is rotatably attached by hinges attached to the pair of left and right arms 29 and 30 respectively. A pair of front and rear guards 31, 32 are mounted on the rotation frame 26, and these guards 31, 32 are connected to each other by a connecting member 33.

  A battery cover 36 is attached to the lower end of the housing 10 on the back side. The inside of the battery lid 36 is a battery housing portion as shown in FIG. 3, and a battery case 37 is inserted into the battery housing portion. The battery case 37 accommodates, for example, four dry batteries 38, and this sound recorder is driven by the output of these dry batteries 38.

  Next, the mounting structure of the pair of left and right microphones 27 and 28, which is a feature of this audio recorder, will be described with reference to FIGS. A portion on the left end side of the rotation frame 26 is rotatably supported by an L-shaped bracket 41 shown in FIG. An attachment plate 42 is further attached to the L-shaped bracket 41, and the attachment plate 42 is attached by connecting a holding plate 43 on the back side thereof via a cylindrical connecting portion 44. A plate spring 45 is interposed between the mounting plate 42 and the holding plate 43, and the plate spring 45 applies a frictional force to the rotation of the mounting plate 42, so that the rotation frame 26 is free to be unexpectedly moved. To prevent it from rotating.

  On the other hand, the right portion of the rotation frame 26 is rotatably supported by an L-shaped bracket 51 and a mounting plate 52 shown in FIG. The mounting plate 52 includes a holding plate 53, and the mounting plate 52 and the holding plate 53 are rotatably supported by the L-shaped bracket 51 via a cylindrical connecting portion 54. Therefore, the rotation frame 26 attached to the attachment plate 52 is rotatably supported.

  FIG. 6 shows the mounting structure of the L-shaped bracket 41 and the mounting plate 42 that rotatably support the left portion of the rotating frame 26. On the other hand, FIG. 7 shows a structure in which the rotation frame 26 is rotatably attached via the L-shaped bracket 51 and the attachment plate 52 at the right end of the housing 10.

  As shown in FIG. 8, the left mounting plate 41 has the rotating frame 26 attached thereto with screws 57. On the other hand, the right mounting plate 52 has the rotating frame 26 attached thereto by screws 58. A printed circuit board 60 is disposed on the rotation frame 26, and lead wires 61 and 62 drawn from the microphones 27 and 28 are connected to the printed circuit board 60. Further, left and right lead lines 63 and 64 are drawn from the printed circuit board 60. A cover 65 is attached on the rotating frame 26, and the printed circuit board 60 and the lead wires 61 to 64 are covered by the cover 65.

  Therefore, according to such an audio recorder, the rotating frame 26 to which the pair of left and right microphones 27 and 28 are attached is attached to the attachment plates 42 and 52 at both left and right ends, and the attachment plates 42 and 52 are provided to the left and right. The brackets 41 and 51 are rotatably supported. Therefore, from this, the rotation frame 26 to which the microphones 27 and 28 are attached rotates in the front-rear direction. Here, as shown in FIGS. 4 and 5, the left and right holding plates 43 and 53 are respectively formed with protrusions 46 and 55, and these protrusions 46 and 55 are notches 47 and 56 of the holding plates 43 and 53. The rotation range of these protrusions 46 and 55 is restricted by the notches 47 and 56. In particular, here, the rotation frame 26 can be rotated at an angle of 30 degrees toward the front side (see FIG. 1), whereas it can be rotated at an angle of 40 degrees on the back side. (See FIG. 2).

  In addition, the microphones 27 and 28 on the rotation frame 26 are arranged so that their axes intersect each other and the intersection angle has a value of about 90 degrees. According to such a so-called XY-type microphone, not only the sound from the left and right, but also the sound from the middle of the left and right can be reliably collected, thereby achieving an ideal frequency characteristic. .

  FIG. 10 shows frequency characteristics when recording is performed by the audio recorder according to the present embodiment. As is apparent from the frequency characteristics, characteristics having high responsiveness over a wide band are clearly shown. Indicated. FIG. 11 shows the directivity characteristic. As is clear from this characteristic, it is proved that the so-called hollowing out of the middle part is prevented.

  FIG. 12 shows the same frequency characteristic as FIG. 10, and this characteristic is data when the frequency characteristic is measured in a state where the front screen and the front grill are removed.

  In addition, such an audio recorder particularly has the right and left microphones 27 and 28 on the rotation frame 26 placed when the back frame is placed with the rotation frame 26 tilted to the back side as shown in FIG. The guard 32 to be protected serves as a stand, which makes it possible to hold the sound recorder in an inclined state.

  Next, another embodiment will be described with reference to FIGS. In this embodiment, the left and right microphones 27 and 28 are mounted on the movable bases 71 and 72, respectively, and the movable bases 71 and 72 are movably mounted on a rail 73 corresponding to a rotating frame. . Accordingly, by moving the movable bases 71 and 72 on the rail 73, the mounting positions of the left and right microphones 27 and 28 can be changed. For example, as shown in FIG. It is possible to arrange them to intersect at an angle of. Alternatively, as shown in FIG. 16, with the left and right microphones 27 and 28 juxtaposed side by side, they can be arranged so that their axes are parallel. Therefore, the directions of the left and right microphones 27 and 28 can be arbitrarily adjusted according to the conditions for use, thereby enabling recording with better characteristics.

  Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the technical idea of the invention included in the present application. For example, the above embodiment relates to an audio recorder that uses a recording medium of a semiconductor memory. However, the present invention can also be applied to an audio recorder that uses, for example, a tape cassette, an optical disc, or a magneto-optical disc. is there.

  The present invention can be widely used for portable audio recorders.

It is the perspective view and side view of the state which inclined the microphone ahead. It is the perspective view and side view of the state which inclined the microphone to the back side. It is a longitudinal cross-sectional view of the state which inclined the microphone toward the front. It is the perspective view and longitudinal cross-sectional view which show the structure of the left hinge bracket. It is the perspective view and longitudinal cross-sectional view which show the structure of a right hinge bracket. It is a perspective view which shows the attachment structure of the left hinge bracket. It is a perspective view which shows the attachment structure of a right hinge bracket. It is a disassembled perspective view of a rotation frame. It is a principal part perspective view of the state which attached the rotation frame. It is a graph which shows the level with respect to the frequency of this audio recorder, ie, a frequency characteristic. It is a graph which shows the characteristic of directivity. It is a graph which shows the frequency characteristic of the state which removed the front screen and the front grille. It is a principal part perspective view which shows the attachment structure of the microphone of a modification. It is a perspective view of the state seen from the reverse direction of the microphone. It is a top view of the state which has arrange | positioned the microphones on either side so that those axis lines may mutually cross. It is a top view of the state which has arrange | positioned the microphones on either side so that those axes may become mutually parallel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Housing | casing, 11 ... Level meter (left), 12 ... Level meter (right), 13 ... Display part, 14 ... Operation button, 17 ... Adjustment knob (for headphones), 19 ... Recording volume adjustment knob (left), 20 ... Recording volume adjustment knob (right), 21 ... Lid, 22 ... Slot, 26 ... Rotating frame, 27 ... Microphone (left), 28 ... Microphone (right), 29 ... Arm (left), 30 ... Arm (right) ), 31 ... Guard (front), 32 ... Guard (rear), 33 ... Connecting member, 36 ... Battery cover, 37 ... Battery case, 38 ... Dry battery, 41 ... L-shaped bracket (left), 42 ... Mounting plate, DESCRIPTION OF SYMBOLS 43 ... Holding plate, 44 ... Cylindrical connection part, 45 ... Leaf spring, 46 ... Projection, 47 ... Notch, 51 ... L-shaped bracket (right), 52 ... Mounting plate, 53 ... Holding plate, 54 ... Tube Connecting part, 55 ... projection, 56 ... notch, 57, 58 ... screw, 6 ... PCB, 61, 62 ... lead wire, 63, 64 ... lead wire, 65 ... cover, 71 ... moving base (left), 72 ... moving base (right), 73 ... rail

Claims (10)

In a portable audio recorder,
A portable audio recorder characterized in that a pair of left and right microphones are arranged on the upper part of a casing so that their axis lines intersect and are rotatably mounted in the front-rear direction.   2. The portable audio recorder according to claim 1, wherein the extension portions of the axis of the pair of right and left microphones are arranged so as to intersect at an angle of about 90 degrees.   2. The portable audio recorder according to claim 1, wherein an angle at which the extended portions of the axis lines of the pair of right and left microphones are adjustable.   4. A portable audio recorder according to claim 3, wherein a pair of left and right microphones are respectively mounted on a moving table, and the moving table is movable on a rail.   2. The portable audio recorder according to claim 1, wherein a rotating frame is rotatably attached to an upper portion of the casing, and the pair of left and right microphones are attached to the rotating frame.   2. The portable audio recorder according to claim 1, wherein an arm is connected to both sides of the upper part of the housing so as to protrude upward, and the rotating frame is attached by the arm via a hinge.   The portable sound recorder according to claim 6, wherein the rotation frame is largely rotated to the rear side rather than the front side.   6. The portable audio recorder according to claim 5, wherein a guard is attached to the rotating frame, and the guard is positioned on a front end side of the pair of left and right microphones to protect the microphone.   9. The portable audio recorder according to claim 8, wherein the guard has an arch shape, is attached to the front and rear on the rotating frame, and the front and rear guards are connected by a connecting member.   The portable sound recorder according to claim 9, wherein the portable sound recorder is used as a support means when the guard is tilted to the back side and placed with the back side down.

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