JPH0586115B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a microphone device used to simultaneously record the perspective state of an image and sound in correspondence with each other.

BACKGROUND ART In recent years, with the spread of camera-integrated video, there have been many opportunities for video and sound to be recorded simultaneously. The output of the microphone used at this time is constant regardless of the distance of the image. The camera-integrated video microphone mentioned above will be explained below. Fifth
The figure shows the appearance of a conventional camera-integrated video, in which a microphone 30 is mounted on the top of the camera-integrated video body. At this time, the microphone output and the zoom lens are not linked, and as seen in the microphone output characteristic 31 shown by the broken line in Figure 6, the microphone output is The output is constant. Furthermore, the directivity is also constant.

Problems to be Solved by the Invention However, with the above configuration, sounds that are unrelated to the telephoto and wide-angle conditions of the video, that is, the perspective of the video, are recorded, so even sounds that are treated as noise unrelated to the video are recorded, and when played back, The problem was that it was difficult to hear and lacked a sense of realism, especially in wide-angle settings.

In view of the above-mentioned problems, the present invention provides a microphone device that is capable of zooming sound in conjunction with zooming of images and has excellent operability.

Means for Solving the Problems In order to solve the above-mentioned problems, the microphone device of the present invention includes a reflective/non-reflective material that is wound in at least one row on the outer circumference of a rotating lens barrel of a zoom lens, and a light-emitting surface. One or more pairs of light-emitting and light-receiving elements are arranged so that their light-receiving surfaces face each other, the light emitted from the light-emitting elements is irradiated onto the reflective and non-reflecting material, and a zoom lens rotation signal obtained by the light-receiving element is used to generate an image. It is equipped with a microphone output variable device that is linked to the sound.

Effects According to the present invention, by controlling the rotational information of the zoom lens, that is, the directivity and sound volume corresponding to the zoom magnification, it is possible to perform recording corresponding to the sense of perspective and spaciousness of the image.

Embodiment A microphone device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a method of obtaining zoom lens rotation information of a microphone device according to a first embodiment of the present invention. In FIG. 1, numeral 1 is a first light emitting element and numeral 2 is a first light receiving element, which constitute a pair, and are arranged opposite to a second reflective material 11. Similarly, the second light emitting element 3 and the second light receiving element 4 are arranged as a pair, facing the first reflective material 10. The first reflective material 10 and the second reflective material 11 are wound at desired rotation angle positions of the 12 zoom lenses. 5 is a printed circuit board with a first light emitting element 1;
The light receiving element 2, the second light emitting element 3, and the second light receiving element 4 are fixed and electrically connected. 6 is a connector used for transmitting and receiving signals and supplying power. 8 is a zoom motor, and a second gear 9 is integrated into the shaft thereof. A first gear 7 is integrated with the zoom lens 12, and rotation of the zoom motor is transmitted to the first gear 12 via a second gear 9.

The operation of the method for obtaining zoom lens rotation information and the microphone apparatus configured as above will be described below with reference to FIGS. 1, 3, and 4. First, in FIG. 1, the rotational direction A of the second gear 9 integrated with the zoom motor 8 is transmitted to the first gear 7 integrated with the lens barrel of the zoom lens 12 to obtain rotation B. Due to this rotation, the first reflective material 10 and the second reflective material 11 wound around the lens barrel of the zoom lens 12 also rotate, so that the first light emitting element, the first light receiving element 2, and the second light emitting element are rotated. The relative position between the element 3 and the second light receiving element 4 changes. First reflective material 10, second reflective material 1
1, the reflective materials are arranged discontinuously due to the rotation of the zoom lens 12. Here, aluminum foil was used as the reflective material. The black lens barrel of the zoom lens 12 was used as the non-reflective part. Therefore, depending on the rotation of the zoom lens 12, there will be reflection and non-reflection. If this is detected as the first light emitting element 1 and the first light receiving element 2 and the second light emitting element 3 and the second light receiving element 4, rotation information of the zoom lens 12, that is, zoom magnification information of the zoom lens 12 is obtained. can get. This information is signal-processed via the connector 6. Next, signal processing will be explained using FIG. FIG. 3 is a block diagram of the microphone device of the present invention, which includes a zoom lens 12, a first light emitting element 1, a first light receiving element 2, a second light emitting element 3, a second light receiving element 4, a first
The reflective material 10 and the second reflective material 11 are the same as in FIG. 15 is a drive circuit that drives the first light emitting element 1 and the second light emitting element 3; 16 is a zoom lens 1;
2 into a digital signal, and a first output variable device 18 and a second output variable device 2.
0, the gain of the third output variable device 22 is controlled. 23 is the R channel input signal terminal of the stereo microphone, 17 is the first amplifier that amplifies the R channel input signal of the stereo microphone, 24 is the L channel input signal terminal of the stereo microphone, and 19 is the L channel input signal terminal of the stereo microphone.
A second amplifier amplifies the channel input signal, 25 is an input signal terminal of the super-directional microphone, and 21 is a third amplifier that amplifies the input signal of the super-directional microphone. 26 is a first output terminal, and 27 is a second output terminal, both of which output signals controlled by the digital control signal 16. FIG. 4 is a diagram showing the relationship between the zoom state of the zoom lens 12 and the output of the microphone. The vertical axis is the microphone output, and the horizontal axis is the zoom lens 1.
2 zoom state is shown. As explained with reference to FIG. 1, the rotation information of the zoom lens 12 is converted into a 2-bit signal by the digital control signal 16, and four stages of rotation information are obtained. Although 2 bits are used here, 3 bits may also be used, and in this case, eight levels of rotation information can be obtained. Furthermore, if the number of bits is increased, more stages of rotation information can be obtained. zoom lens 1
2 is in tele mode, that is, in a zoomed-up state, the super directional microphone signal input from the super directional microphone input signal terminal 25 is sent to the amplifier 2.
After being amplified by 1, it is outputted via the third output variable device 22. This third output variable device 22 controls the output of the super-directional microphone to be maximized using the digital control signal 16, which is rotation information of the zoom lens 12, and to minimize the output of the super-directional microphone in the opposite wide-angle state. do. This output characteristic is the fourth
This is indicated by a solid line 29 in the figure. On the other hand, the stereo microphone R channel signal input from the stereo microphone R channel input signal terminal 23 is amplified by the amplifier 17 and then sent to the first output variable device 18.
Output via . Similarly, the stereo microphone L channel signal input from the stereo microphone L channel input signal terminal 24 is amplified by the amplifier 19 and then outputted via the second output variable device 20. This first output variable device 18,
The second output variable device 20 uses a digital control signal 16, which is rotation information of the zoom lens 12, to minimize the output signal of the stereo microphone R channel and the stereo microphone L channel in the telephoto state, and minimize it in the wide state. Control to maximize. This output characteristic is expressed by the broken line 28 in Figure 4.
It was shown in Here, a difference C between the superdirectional microphone output and the stereo microphone output is provided. This is to obtain consistency in the relationship between the zoom magnification of the video and the sound.

As described above, according to this embodiment, at least one pair of light-emitting and light-receiving surfaces are arranged so that the light-emitting and light-receiving surfaces face each other on the reflective and non-reflective material that are wound in at least one row on the outer circumference of the rotating lens barrel of the zoom lens. By providing the element, images and sounds can be linked by a zoom lens rotation signal obtained by the light receiving element by irradiating the light emitted from the light emitting element onto the reflective/non-reflective material.

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

FIG. 2 is a perspective view showing a method of obtaining zoom lens rotation information of a microphone device according to a second embodiment of the present invention. In the same figure, 1 is the first
2 is a first light receiving element, 4 is a second light receiving element, 7 is a first gear, 8 is a zoom motor, 9
is the second gear, 10 is the first reflective material, and 11 is the second gear.
12 is a zoom lens, which has the same structure as that shown in FIG. 1. The difference from FIG. 1 is that the first light receiving element 2 and the second light receiving element 4 are arranged to sandwich the first light emitting element 1.

The operation of the method for obtaining zoom lens rotation information of the microphone device configured as described above will be described below. Light from the first light emitting element 1 is irradiated onto both the first reflective material 10 and the second reflective material 11. The irradiated light is transmitted to the first light receiver 2
is detected by the second light receiver 4. This becomes the rotation information of the zoom lens 12 as explained in FIG. This rotation information is guided to signal processing via the printed circuit board 14 and connector 13. The following signals are the same as the operation explained in FIG.

As described above, by arranging the light receiving elements of the first light receiving element 2 and the second light receiving element 4 in close proximity to the light emitting element 1, the four elements in the first embodiment are reduced to three elements, resulting in low current consumption. Space saving can be realized in this embodiment, and the same function as the first embodiment can be obtained.

In the first embodiment, aluminum foil was used as the reflective material, but it may also be a film deposited with aluminum.

Further, in the second embodiment, the light emitting element and the light receiving element are arranged on the same plane, but they may be arranged in a curved manner so as to be equidistant from the circumferential surface of the zoom lens.

Effects of the Invention A pair or more of light emitting and light receiving elements are arranged on a reflective and non-reflecting material wound in at least one row on the outer circumference of a rotating lens barrel of a zoom lens so that a light emitting surface and a light receiving surface face each other, By providing a microphone output variable device that synchronizes video and sound with the zoom lens rotation signal obtained by the light receiving element by irradiating the light emitted from the element onto the reflective/non-reflective material, it is possible to correspond to the zoom magnification. Directivity and volume can be controlled, allowing recording to match the perspective and spaciousness of the video.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a method of obtaining zoom lens rotation information of a microphone device according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing a method of obtaining zoom lens rotation information of a microphone device according to a second embodiment of the present invention. 3 is a block diagram of the microphone device of the first embodiment, FIG. 4 is a diagram showing the relationship between the zoom state of the zoom lens and the output of the microphone, and FIG. 5 is a diagram of the conventional camera unit. FIG. 6, an external view of the body video, is a diagram showing the relationship between the zoom state of a conventional zoom lens and the output of a microphone. DESCRIPTION OF SYMBOLS 1... First light emitting element, 2... First light receiving element, 3... Second light emitting element, 4... Second light receiving element, 5... Printed circuit board, 6... Connector, 7...
...First gear, 8...Zoom motor, 9...Second gear
gear, 10...first reflective material, 11...second reflective material, 12...zoom lens, 18...first output variable device, 20...second output variable device, 22...
...Third output variable device, A... Rotation direction of second gear 9, B... Rotation direction of first gear 7, C... Output difference between stereo microphone and super directional microphone.

Claims (1)

[Scope of Claims] 1. A pair or more of light-emitting and light-receiving elements are arranged on a reflective and non-reflective material wound and arranged in at least one row on the outer circumference of a rotating lens barrel of a zoom lens so that a light-emitting surface and a light-receiving surface face each other. and a microphone output variable device that synchronizes video and sound with a zoom lens rotation signal obtained by the light receiving element by irradiating the light emitted from the light emitting element onto the reflective and non-reflective material. microphone device. 2. A light emitting element is sandwiched between two light receiving elements so that the light emitting surface and the light receiving surface face the reflective/non-reflective material arranged in at least two or more rows on the outer circumference of the rotating lens barrel of the zoom lens. and a variable microphone output device in which video and sound are linked by a zoom lens rotation signal obtained by the two light receiving elements by irradiating the light emitted from the one light emitting element onto the reflective and non-reflective material. A microphone device comprising: