JPH0210971A - Microphone equipment - Google Patents

Abstract

PURPOSE:To control the directivity and sound volume in response to zoom magnification by using a zoom lens drive position signal obtained through a reflected light obtained from a triangle reflecting member so as to control a microphone output variable device. CONSTITUTION:The triangle reflecting member 5 wound on the outer circumference of a rotary barrel of a zoom lens 10, the 1st flat lens 3 for lighting having a distribution of refraction rate in the broadwise direction and the 2nd flat lens 4 for photodetection are arranged opposite to each other. The radiated light from the lens 3 is radiated to the reflecting member 5 to detect a reflected light obtained through the reflection in the reflection member 5 is detected by the lens 4 to obtain a zoom lens rotary position signal. The rotary position signal controls a microphone output variable device to make the video and sound interlock with each other. That is, the directivity and sound volume is controlled corresponding to the zoom magnification to attain the recording corresponding to the sense of distance or spread of the video image.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 OF THE INVENTION In recent years, with the spread of camera-integrated video, there are 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-body video microphone described above will be described below. FIG. 5 shows the appearance of a conventional camera-integrated video, in which a microphone 30 is mounted on the upper part of the camera-integrated video body. At this time, the microphone output and the zoom lens are not linked, and as can be seen in the microphone output characteristic 31 shown by the broken line in Figure 6, the microphone output is The output is constant. Directivity is also constant.

Problems that the invention aims to solve However, with the above configuration, the video is not telescopic.

In the wide state, sounds unrelated to the perspective of the image are recorded, so even sounds that are dismissed as noise unrelated to the image are recorded, making it difficult to hear during playback, and furthermore, there is a problem that the sense of presence is lacking in the wide state. was.

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 problems, the microphone device of the present invention includes a triangular reflective material wound around the outer circumference of a rotating lens barrel of a zoom lens, and a refractive index distribution in the thickness direction. 1st for light emitting
By arranging the flat lens and the second flat lens for light reception so as to face each other, and irradiating the reflective material with the light emitted from the first flat lens for light emission,
A microphone output variable device is provided in which video and sound are linked with a zoom lens rotation position signal obtained by detecting reflected light obtained by being reflected by the reflective material with the second flat lens for light reception. It is something.

Function: With the above-described configuration, the present invention enables recording that corresponds to the sense of perspective and spaciousness of an image by controlling the rotational information of the zoom lens, that is, the directivity and sound volume that correspond to the zoom magnification.

Embodiment Hereinafter, a microphone device according to an embodiment of the present invention will be described 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 an embodiment of the present invention. In FIG. 1, 1 is a light-emitting element, 2 is a light-receiving element, 3 is a first flat lens for light emission provided at the tip of the light-emitting element 1 (hereinafter simply referred to as "first flat lens"), and 4 is a light-emitting element. A second flat lens for light reception (hereinafter simply referred to as "second flat lens") provided at the tip of the light receiving element 2 is arranged so as to face the reflective material 5. 10 is a zoom lens, and a reflective material 5 is wound around the outer circumference of a rotating lens barrel. Reference numeral 6 is an optical fiber for transmitting light signals for emitting and receiving light.

8 is a zoom motor, and a second gear 9 is integrated into its shaft. A first gear 7 is integrated with the zoom lens 1o, and the rotation of the zoom motor 8 is transmitted to the first gear 7 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, 2, and 3. 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 10 to obtain rotation B. Due to this rotation, the reflective material 5 wound around the lens barrel of the zoom lens 10 rotates, so that the first flat lens 3 provided at the tip of the light emitting element l and the second flat lens provided at the tip of the light receiving element 2 rotate.
The relative position between the flat lens 4 and the reflective material 5 changes. Here, the reflective material 5 used is a diagonal aluminum foil. The first flat lens 3 and the second flat lens 4 are made of a triangular reflective material 5.
The width is the same as the base of . Therefore, the ratio of reflection and non-reflection changes as the zoom lens 10 rotates.
The amount of light received will change. This amount of received light is guided to the light receiving element 2 via the optical fiber 6, converted into an electrical signal, and subjected to signal processing. Next, the first flat lens 3 and the second flat lens 4 will be explained using FIG. 2. In FIG. 2, light from the light emitting element 1 indicated by a solid line is guided as a point light source to the end face of the first flat lens 3 via the optical fiber 6.
is converted into a linear light source with a width of . In other words, the flat lenses 3 and 4 have a distribution in which the refractive index gradually decreases in only one direction from the center toward the outer periphery. The linear light source width C is equal to the length of the base of the triangular reflective material 5. On the other hand, the light directed to the light receiving element 2 indicated by the broken line is converted from a linear light source to a point light source and guided to the optical fiber 6. From the above, the amount of light received changes depending on the relative position between the reflective material 5 and the first flat lens 3 and second flat lens 4. 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 10, a light emitting element 1, a light emitting element 2,
The reflective material 5 is the same as in FIG.

15 is a drive circuit that drives the light emitting element 1; 16 is a drive circuit that converts rotation information of the zoom lens 10 into an electrical signal;
This is a control circuit that controls the gains of the output variable device 18, the second output variable device 20, and the third output variable device 22. 23 is the R channel input signal terminal of the stereo microphone, and 17
24 is an L channel input signal terminal of the stereo microphone; 19 is a second amplifier that amplifies the left channel input signal of the stereo microphone; and 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 control circuit 16. FIG. 4 is a diagram showing the relationship between the zoom state of the zoom lens 10 and the output of the microphone. The vertical axis is the microphone output, and the horizontal axis is the zoom 4H of the zoom lens 10.
It represents Jt. As explained in FIG. 1, the rotation information of the zoom lens 10 is converted into an electrical signal by the control circuit 16. When the zoom lens 10 is in the telephoto state, that is, in the zoomed-up state, the superdirectional microphone input signal terminal 25
The superdirectional microphone signal input from 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 using the control circuit 16, which is rotation information of the zoom lens 10, to maximize the output, and to minimize the output of the super-directional microphone in the opposite wide-angle state. . This output characteristic is shown by a solid line 29 in FIG.

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 outputted via the first output variable device 18. At the same time, the stereo microphone upper channel signal input from the stereo microphone upper channel input signal terminal 24 is amplified by the amplifier 19 and then outputted via the second output variable device 20. The first output variable device 18 and the second output variable device 20 are controlled by the control circuit 16 which is rotation information of the zoom lens 10.
Control is performed so that the output signal of the stereo microphone R channel and the output signal of the stereo microphone upper channel are minimized in the tele state and maximized in the wide state.

This output characteristic is shown by the broken line 28 in FIG. Here, a difference is made between the superdirectional microphone output and the stereo microphone output. 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, the triangular reflective material is wound around the outer circumference of the rotating lens barrel of the zoom lens, the first flat lens for light emission having a refractive index distribution in the thickness direction, and arranged so as to face a second flat lens for receiving light,
By irradiating the light emitted from the first flat lens for light emission onto the reflective material, the reflected light obtained by being reflected by the reflective material is detected by the second flat lens for light reception. By controlling the microphone output variable device using the obtained zoom lens rotation position signal, video and sound can be linked.

In the examples, the reflective material was made of aluminum foil, but it may also be a film formed by vapor-depositing aluminum.

Further, although the shape of the reflective material 5 is a triangle, if the - side is made into a curve, the amount of received light does not change linearly, but can also be changed logarithmically. Various curves of changes in the amount of received light can be obtained depending on the shape of the reflective material 5.

Effects of the Invention A triangular reflective material wound around the outer circumference of a rotating lens barrel of a zoom lens, and a first light-emitting material with a refractive index distribution in the thickness direction.
By arranging the flat lens and the second flat lens for light reception so as to face each other, and irradiating the reflective material with the light emitted from the first flat lens for light emission,
The rotation angle of the zoom lens is controlled by controlling the microphone output variable device with the zoom lens rotation position signal obtained by detecting the reflected light obtained by being reflected by the reflection material with the second flat lens for light reception. In other words, the directivity and volume can be controlled in accordance with the zoom magnification, making it possible to record in accordance with the perspective and spaciousness of the image.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a method of obtaining zoom lens rotation information of a microphone device according to an embodiment of the present invention, and FIG. A perspective view showing ray tracing in the second flat lens, FIG. 3 is a block diagram of a microphone device according to an 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 conventional FIG. 6 is a diagram showing the relationship between the zoom state of a conventional zoom lens and the output of a microphone. 1... Light emitting element, 2... Light receiving element, 3
...First flat lens for light emission, 4...
Second flat lens for light reception, 5... Reflective material, 6.
...Optical fiber, 7...First gear, 8
...Zoom motor, 9...Second gear, 10...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... ...-linear light source width, D...
...Output difference between a stereo microphone and a super directional microphone. Name of agent Patent attorney Toshio Nakao Haka18 No. 1 Figure 1--One light emitting element 2--Light receiving element 3--1 flat lens 4--Z flat lens 5--Reflecting material 6- 7-1f) Gear 8--Zoom mode! 9--1 Second gear 10--Zoom lens A--Direction of rotation of the second gear B-11 Direction of rotation of the first gear P

Claims (1)

[Claims] A triangular reflective material wound around the outer circumference of a rotating lens barrel of a zoom lens, a first flat lens for emitting light and a second flat lens for light reception, each having a refractive index distribution in the thickness direction. are arranged so as to face each other, and by irradiating the reflective material with the light emitted from the first flat lens for issuing, the reflected light reflected by the reflective material is transferred to the second flat plate for receiving light. What is claimed is: 1. A microphone device comprising: a microphone output variable device that interlocks video and sound with a zoom lens rotation position signal obtained by detection with a shaped lens;