JPS6016159Y2 - sound collection device - Google Patents

Description

[Detailed description of the invention] This invention relates to a sound collection device built into a stereo recording device, etc., and is capable of stereo sound collection and pinaural sound collection using a pair of left and right microphones built into the device housing. .

Conventionally, there are two types of recording methods using built-in microphones in tape recorders and the like: monaural recording using one microphone and stereo recording using a pair of left and right microphones.

However, in recent years, stereo recording using a dummy head, so-called pinaural recording, has attracted attention because of its realistic feel, but in order to perform binaural recording, the dummy head sound pickup device must be connected to the stereo recording device. Since the recording operation is time-consuming and requires two types of devices, the device itself is large and complicated, making it inconvenient to handle.

Therefore, the present invention has developed a sound pickup device that can perform normal stereo sound collection using a pair of left and right microphones built into the stereo recording device, and can also perform binaural sound collection, which exceeds normal stereo sound collection, with simple operation. This is a proposal.

In other words, the sound pickup device according to the present invention can collect sound without changing the direction of the recording device even when the sound source is on the side of the recording device or when the sound is coming from behind, and the sound source on the side of the recording device is This allows sound to be collected without causing any deterioration of the sound source, and also gives a sense of stability and spaciousness to sound sources moving to the sides and rear.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 indicates a cubic case of a stereo recording device, and microphone grills 2 and 3 are provided on the left and right sides of the front portion 2a, corresponding to the built-in portion of the microphone unit.
It is provided from 3a to side parts 2b, 3b.

A pseudo auricle piece 45 is attached to the rear edge of the side surfaces 2b and 3b of the microphone grills 2 and 3 so as to be movable up and down with respect to the side surface of the case 1, and is interlocked with the microphone unit via an interlocking mechanism to be described later. There is.

3 and 4 show the microphone unit and the interlocking mechanism, but since these are arranged symmetrically with respect to the housing 1 and have the same configuration, only one, that is, the one arranged on the left side, will be explained. .

In the figure, 6 indicates a microphone unit, and a shielding piece 7 made of a plastic material such as flexible rubber is provided at the rear opening 6a.
is crimped and closed.

Reference numeral 8 indicates an interlocking mechanism, which is separated from a support lever 9 that supports the microphone unit 6, an interlocking lever 10 and a toggle spring 11 that are integrally provided on the pseudo auricle piece 4, and the center portion of the support lever 9 is connected to a fixed shaft 12. The lever 10 is supported pivotably, and a long hole 13 is provided in the rear end in the longitudinal direction, and is engaged with a pin 14 bored in the inner end of the interlocking lever 10 .

On the other hand, the intermediate part of the interlocking lever 10 is pivotally supported by a fixed shaft 15 so as to be orthogonal to the support lever 9, and the outer end part is a pseudo auricle piece 4 which is bent and protruded from a window hole 16 formed in the case 1. is integrally connected to.

A toggle spring 11 is elastically stretched between the pin 14 and the fixing pin 17, and when the pseudo auricle piece 4 is in the collapsed state (the state shown by the solid line in FIG. 3), the direction axis of the microphone unit 6 is aligned with the case. Front direction of the body 1, that is, the front part 2 of the microphone grill 2
When the pseudo auricle piece 4 is in the upright state (as shown by the imaginary line in FIG. 3), it is held so that it faces toward the side surface of the casing 1, that is, toward the side surface 2b of the microphone grill 2. be.

Further, a directivity switching mechanism 18 is disposed behind the position where the microphone unit 6 faces the front surface 2a of the microphone grill 2, and this switching mechanism 18 is connected to the shielding piece 7 of the rear opening 6a of the microphone unit 6. When the shielding piece 7 comes into contact with
is configured to be in a through-hole state.

That is, the directivity switching mechanism 18 has a plurality of sharp thin tubes 20 implanted through the substrate 19 as shown in FIG. 4, for example.
When the shielding piece 7 on the rear surface of the microphone unit 6 comes into contact, the thin tube 20 passes through the shielding piece 7 and an acoustic passage is created on the rear surface of the microphone unit 6.

In this way, the microphone unit 6 connects to the microphone grill 2.
When facing the front surface 2a of the microphone unit 6, the shielding piece 7 becomes a through-hole state due to the directivity switching mechanism 18 located at the rear of that position, and an acoustic path is formed in the rear opening 6a of the microphone unit 6. Microphone unit 6
has directivity, and when the microphone unit 6 is opposed to the side surface 2b of the microphone grille 2, the shielding piece 7 of the rear opening 6a is separated from the directivity switching mechanism 18 and is therefore closed. The microphone unit 6 is non-directional, and in this state, the pseudo auricle piece 4 is erected, so that sound is collected as binaural sound.

In FIG. 3, reference numerals 21 and 22 are fixed pins with which the interlocking lever 10 is abutted and locked when the pseudo auricle piece 4 is in the down and upright states, respectively.

The microphone unit 6 interlocking mechanism 8 and directivity switching mechanism 18 configured as described above are arranged on the left side inside the right microphone grille 3 of the housing 1 in relation to the right pseudo auricular piece 5 as described above. Since they are arranged symmetrically with each other, when both pseudo auricle pieces 4 and 5 are laid down, both microphone units 6 are positioned facing the front parts 2a and 3a of the microphone grill 2.3, and the directivity switching mechanism 18 imparts directivity and creates a stereo sound collection state, allowing stereo recording. In addition, when both pseudo auricular pieces 4 and 5 are erected, both microphone units 6 are connected to side parts 2b and 3b of microphone grills 2 and 3. They are positioned opposite to each other and are separated from the directivity switching mechanism 18 to become non-directional, and both the pseudo pinna pieces 4 and 5 produce a pinaural sound effect and are in a binaural sound collection state, allowing binaural recording.

Note that the interlocking mechanism 8 and the directivity switching mechanism 18 are not limited to those shown in this embodiment. For example, as the directivity switching mechanism 18, the microphone unit 6 is connected to the pseudo auricle piece 4,
5 and side parts 2b and 3b of the microphone grills 2 and 3.
The microphone unit 6 may be configured to abut against the rear surface of the microphone unit 6 in a state where the microphone unit 6 is opposed to the microphone unit 6, thereby closing the mouth and making the microphone unit 6 non-directional.

As described above, according to the present invention, a single one-box stereo recording device can perform two operations: general stereo recording and binaural recording, and by switching between them, it is possible to perform two operations: when the sound source is on the side of the recording device, or when the sound is coming from behind. It is possible to collect sound without changing the orientation of the recording device even when the recording device is moving, and it is also possible to collect sound from sound sources on the side of the recording device without causing high-frequency deterioration. This has the effect of making it possible to perform optimal recording depending on the recording source.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a stereo recording device using a sound pickup device according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a plan view of an embodiment of the sound pickup device according to the present invention, and FIG. It is an enlarged sectional view of the same part. In the figure, 1 is the recording device case, 2 and 3 are the microphone grills, and 4 and 5
6 is a pseudo auricle, 6 is a microphone unit, 8 is an interlocking mechanism, and 18 is a directivity switching mechanism.

Claims (1)

[Scope of utility model registration request] Apertures are provided in the vicinity of the respective boundaries between the left and right panel surfaces constituting the air-permeable closed casing and a panel surface that is continuous with both panel surfaces, and is rotatably provided facing the apertures. A first state in which the pair of microphones and the direction axes perpendicular to the respective sound collection surfaces of the pair of microphones are substantially perpendicular to the - panel surface; A sound collection device comprising: an operation section for selectively switching the orientation of the pair of microphones to a second state.