JP3497191B2 - Camera and camera magnification calculation method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a conversion lens.
A camera that can be equipped with a conversion lens
The present invention relates to a camera that can be attached to a camera, in which the directivity and volume of a built-in microphone for voice recording can be adjusted according to the shooting magnification.

[0002]

2. Description of the Related Art In recent years, with the widespread use of camera-integrated video cameras, their functions are also becoming multifunctional.
Among such multifunctional cameras, for example, JP-A-63-6
The video camera disclosed in Japanese Patent Publication No. 2500 switches ON / OFF of one of the two microphones by a position encoder output signal of a focus lens, and outputs a zoom position encoder output signal to directivity of the microphone. And the volume is adjusted. Further, the video device disclosed in Japanese Patent Laid-Open No. 64-60069 is configured such that the mixing ratio of the volume of the built-in microphone device is changed according to the zoomed state of the captured image.

[0003]

In a zoom camera, since it is necessary to increase the magnification beyond the range of the zoom device built in the camera, a conversion lens may be attached to the photographing lens to perform photographing. However, the above-mentioned JP-A-63
Even if the video camera disclosed in Japanese Laid-Open Patent Publication No. 62500 or the video device disclosed in Japanese Laid-Open Patent Publication No. 64-60069 is used, it is possible to cope with the widening of the image frame due to the mounting of the conversion lens and the shooting state such as telephoto. It was impossible to record the sound by using the conversion lens, and the enhancement of the realism by installing the conversion lens was insufficient. Also, the proper presence
To get the feeling, double the conversion lens attached.
It is necessary to adjust the microphone according to the rate.
In order to use the conversion lens attached to the camera
Had to recognize.

The present invention has been made to solve the above-mentioned problems, and a mounted conversion lens
It is possible to recognize the magnification of the camera with a simple configuration, and adjust the characteristics of the microphone based on the change in the shooting magnification due to the installation of a conversion lens.A camera capable of more realistic audio recording adapted to the shooting screen. To provide,
Magnification of the installed conversion lens is simple
Providing a computable camera and installing the attached camera
Double the camera that can be operated with a simple version lens
An object is to provide a rate calculation method .

[0005]

A first camera according to the present invention comprises a lens portion to which a conversion lens can be attached,
A zoom unit provided in the lens unit, a memory storing table data indicating focus position data of the lens unit with respect to each zoom position at a predetermined subject distance when the conversion lens is not mounted, It corresponds to the zoom position at the specified subject distance detected with the conversion lens attached.
And focus position data of the lens portion that, the detection time
Magnification operation in response to the's over beam positions for calculating a magnification of the conversion lens mounted on the basis of the relationship between the focus position data of the lens portion in the non-mounted state of the conversion lens obtained from the table data Means and a microphone characteristic adjusting means for adjusting the directivity and / or the volume of the microphone based on the magnification information of the attached conversion lens calculated by the magnification calculating means. . The second camera according to the present invention includes a lens unit to which a conversion lens can be attached, a zooming unit provided in the lens unit, and a predetermined subject distance when the conversion lens is not attached. A memory that stores table data that indicates focus position data of the lens unit with respect to a zoom position , and a predetermined value that is detected when the conversion lens is attached.
Focus of the focus position data of the lens portion with respect to the zoom position at the object distance, and corresponds to FIG chromatography zoom position at the time of the detection of said lens portion in the non-mounted state of the conversion lens obtained from the table data Magnification calculating means for calculating the magnification of the mounted conversion lens based on the relationship with the position data. In addition, the camera magnification calculation method according to the present invention includes a lens unit to which a conversion lens can be attached, and focus position data of the lens unit with respect to each zoom position at a predetermined subject distance when the conversion lens is not attached. in magnification calculation method of the conversion lens of a camera and a memory storing a table data indicating the conversion lens is detected in a state of being mounted, a predetermined object
And focus position data of the lens portion with respect to the zoom position at Utsushitai distance, the focus of the lens portion of the corresponding FIG chromatography zoom position at the time of the detection by the non-wearing state of the conversion lens obtained from the table data It is characterized in that the magnification of the attached conversion lens is calculated based on the relationship with the position data.

[0006]

[Function] Calculates the magnification of the installed conversion lens
Then , based on the photographing magnification changed by mounting the conversion lens, the microphone characteristic adjusting means adjusts the directivity and / or the volume of the microphone,
Outputs audio signals.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a camera-integrated type V showing a first embodiment of the present invention.
It is a block block diagram of TR. The VTR of the present embodiment includes a camera unit 20 that captures a subject image and converts it into an image pickup signal.
An audio input unit 21 for taking in an audio signal, a circuit system control unit 7 for controlling each circuit, a video signal processing circuit 8 for processing an image pickup signal from the camera unit 20, and an audio signal for the audio input unit. An audio signal processing circuit 14 for
A recording circuit 9 for converting the audio signal and the video signal into a recording signal that can be magnetically recorded, and a magnetic head for recording the superimposed signal of the audio signal and the video signal on a magnetic tape 11 as a recording medium. It is composed of 10 and.

The structure of the camera section 20 will be described in more detail. A lens section 2 on which a conversion lens 22 can be mounted, and a lens driving section 5 for driving the lens section 2.
An image pickup device 3 for converting a subject image taken in via the lens unit 2 into an electric signal, an image pickup signal processing circuit 4 for processing an image pickup signal of the image pickup device 3, and a high frequency signal included in the image pickup signal. A camera control unit 1 having a built-in AF (autofocus) control unit for setting a focus position of a master lens 2d (FIG. 2) and a zooming control unit for a designated zoom position, an instruction for zooming, or a circuit system. And an operation unit 6 for issuing operation instructions.

FIG. 2 is a diagram showing the structure of the camera section 20 in detail. The lens section 2 is a rear focus type lens having a four-group structure. The lens unit 2 includes a front lens 2a, a variator lens 2b for zooming, a compensator lens 2c, and a master lens 2d for focusing. Further, the lens drive unit 5 includes a zoom drive circuit 5a and a zoom motor 5b controlled by the camera control unit 1, and a focus drive circuit 5d and a focus motor 5e.
And an encoder 5c for detecting the zoom position of the variator lens 2b.

The focus motor 5e is composed of a stepping motor, and the position detecting portion of the master lens 2d is not particularly required. Further, the camera control unit 1 has a built-in magnification recognizing means for recognizing the magnification relating to the conversion lens.
As will be described later, the zoom position data, the table data stored in the memory, which indicates the focus position with respect to the zoom position (see FIG. 3), and the AF process when the conversion lens 22 is attached. The lens magnification information is calculated from the focus position data and the like obtained by. This magnification information is stored in the voice input unit 21.
Then, the directivity control unit 13h, which is a microphone characteristic adjusting unit, controls the directivity and the sound volume of the voice input unit 21 based on the magnification.

Now, a method of calculating the lens magnification information in the above-mentioned camera control section 1 will be described. In addition,
The lens magnification information indicates the photographing magnification of the conversion lens 22 attached to the lens unit 2.

FIG. 3 is a diagram showing changes in the focus position of the master lens 2d with respect to each zoom position without the conversion lens 22 being attached at each subject distance indicated by L. In the camera of this embodiment, it is assumed that the memory unit built in the camera control unit 1 stores, as table data, focus position data for each zoom position at a subject distance of 1 m, which is a predetermined distance. Therefore, when the zoom position information is fetched from the encoder 5c, the zoom position, for example, the focus position at a subject distance of 1 m, for example, the value Z1, is obtained, for example, the value K1.

On the other hand, when the conversion lens 22 having the magnification N is attached to the taking lens system, the focus position KN at the time of focusing is proportional to the square of the magnification N, and therefore the following equation is established. That is, K1 × N2 = KN ... (1), and the magnification N of the conversion lens 22 mounted is N.
Becomes N = (KN / K1) ^1/2 …………………… (2).

Therefore, with the conversion lens 22 attached, at the set zoom position Z1, an AF operation is performed on an object at a predetermined distance, for example, a distance of 1 m, and the focus position (focus position) KN is set. If it is detected, the magnification N of the conversion lens 22 is calculated from the focus position KN and the focus position K1 with respect to the zoom position Z1 from the memory storage data according to the equation (2).
Can be asked.

FIG. 4 is a diagram showing a flowchart of processing for calculating the magnification N of the conversion lens.
With the conversion lens 22 attached, first, in step S1, AF processing is performed on a subject at a predetermined distance, for example, a distance of 1 m, and the focus position KN is detected. In step S2, the zoom encoder 5c
Then, the zoom position Z1 is detected. In step S3, the focus position K1 with respect to the zoom position Z1 is read from the table data stored in the memory, and in step S4, the magnification N is calculated from the equation (2). On the other hand, the voice input unit 21 is
Comprising a zoom microphone, the microphone unit 12 and the directivity processing unit 13 that is a microphone characteristic adjusting unit.
It consists of and. As shown in FIG. 5, the microphone section 12 includes a bidirectional microphone (hereinafter referred to as a microphone) 12a and a unidirectional microphone 12b.
A super directional microphone 12c, amplifiers 12d, 12e, 12f corresponding to the respective microphones, and amplifiers 12d, 12e.
It is composed of an adder circuit 12g and a subtractor circuit 12h for performing addition or subtraction of the outputs of. The axis of the unidirectional microphone 12b is oriented along the lens optical axis, and the axis of the bidirectional microphone 12a is oriented 90 ° different from the lens optical axis. ing.

Further, the directivity processing section 13 has the outputs of the adder circuit 12g and the subtractor circuit 12h and the amplifier 12f.
Variable type variable amplifiers 13a, 13 for each output of
b, 13c and an adder circuit 1 for the output of the variable amplifier
3d and 13e, variable amplifiers 13f and 13g for adjusting the volume of the R (right) channel or the L (left) channel for taking in the outputs of the adder circuits 13d and 13e, and further from the encoder 5c. Zoom position information and the magnification information output from the camera control unit 1 are input, and based on the information, the gains of the variable amplifiers 13a, 13b, 13c and 13f, 13g are controlled to directivity and volume of the microphone. And a directivity control unit 13h for controlling the.

The gains of the variable amplifiers 13a and 13b are the same, and the gain of the variable amplifier 13 is inversely proportional to the gains of the variable amplifiers 13a and 13b. Also,
When the conversion lens 22 is not attached, the directionality of the microphone is controlled based on only the zoom position data with the magnification information having a value of 1.

FIGS. 6A to 6E are diagrams showing directivity patterns of signals at points A to E on the circuit of the voice input unit 21 of FIG. In this figure, z indicates the optical axis direction, and y indicates the horizontal direction orthogonal to the optical axis. Further, (F) and (G) of FIGS. 7 and 8 are the voice input unit 2 of FIG.
One variable amplifier 13a, 13b, 13c or 13f, 1
It is the figure which showed the directivity pattern of the signal of the points F and G on a circuit at the time of adjusting 3g. And, (F) and (G) of FIG. 7 are broadened directivity patterns when the above variable amplifiers are adjusted to the wide side, and (F) and (G) of FIG. This is a narrowed directional pattern when the amplifier is adjusted to the tele side. Also in this figure, z
Indicates the optical axis direction, and y indicates the horizontal direction orthogonal to the optical axis. At the same time as the control of the directivity, when the magnification is changed to the tele side where the magnification is large or the wide side where the magnification is small, the recording volume itself is also changed to be large or small.

In the camera of the present embodiment constructed as described above, when the video information and the audio information are simultaneously recorded, the zoom position information from the encoder 5c alone is used when the conversion lens 22 is not attached. Then, the directivity control unit 13h of the voice input unit 21 controls the directivity of the microphone. Further, the conversion lens 22 is attached, and the lens magnification information (value N)
When a value other than 1 is detected by the camera control unit 1, the directivity control unit 13h based on the lens magnification information.
This controls the directivity of the microphone. Then, a sound with a realistic sensation that matches the shooting angle of view with the conversion lens 22 attached is recorded.

FIG. 9 is a diagram showing the directional angles of the microphones when the conversion lens 22 is not attached and when it is attached, and shows the directivity from the tele state to the wide state when the conversion lens 22 is not attached. The range is indicated by ± P1 to ± P2. When the conversion lens 22 is mounted, the directivity is controlled according to the value of the lens magnification of the conversion lens 22, and in FIG. 9, the directivity range is shown by ± P3 to ± P4 from the tele state to the wide state. Be done.

In the camera of this embodiment, two pieces of information, zoom information and magnification information, are input to the directivity control section 13h incorporated in the voice input section 21 shown in FIG. It is also possible to propose a modification in which one piece of information is indicated by one piece of directivity information and the directivity controller 13h is controlled by the one piece of information.

Next, a camera-integrated VTR according to the second embodiment of the present invention will be described. The camera of this embodiment is different from the camera of the first embodiment in the camera control unit.
The magnification recognition means for recognizing the lens magnification information when the conversion lens 22 is attached is different. That is, in the camera of this embodiment, the magnification recognition means detects the magnification by the conversion lens 22 at a predetermined zoom position, for example, at the zoom position Z1 at the telephoto end, the wide-angle end, or the like. After that, AF processing is performed at the zoom position to obtain the focus position KN, and the lens magnification N is obtained from the equation (2). The other configurations are the same as those of the camera of the first embodiment.

FIG. 10 is a flowchart of the processing for recognizing the lens magnification. After the conversion lens 22 is mounted, in step S21, the variator lens 2b and the compensator lens 2c are moved to a predetermined zoom position Z1. In step S22, AF processing is performed to detect the focus position KN. Step S2
3, the conversion lens 2 according to equation (2)
A multiplication factor N of 2 is calculated.

According to the camera of this embodiment, the same effect as the camera of the first embodiment can be obtained, and at the same time, only the focus position data for the predetermined zoom position Z1 needs to be held in the memory, so that the memory capacity becomes small. Also, it is advantageous in terms of cost.

Next, a camera-integrated VTR according to the third embodiment of the present invention will be described. The camera according to the present embodiment is different from the camera according to the first embodiment in that a mounting detection switch 23 for the conversion lens 22 is arranged in the lens unit 2 as shown in the block diagram of the camera unit in FIG. Are different. Then, only when the mounting of the conversion lens 22 is detected by the detection switch 23,
The calculation of the lens magnification N shown in FIG. 4 is executed. The other structure of the camera of this embodiment is the same as that of the camera of the first embodiment.

FIG. 12 is a longitudinal sectional view showing the mounting state of the mounting detection switch. The switch 23 is an actuator arranged at the rear of the conversion lens mounting screw portion 2e of the lens portion 2. 23c and contact points 23a, 23
and b. Then, when the conversion lens 22 is mounted and the actuator 23c is pressed, the contacts 23a and 23b are turned on. The ON signal is input to the camera control unit 1 as shown in FIG.
Then, the calculation of the magnification N by the conversion lens 22 is executed.

In the cameras of the above-described first to third embodiments, the conversion lens 22 is used as the lens magnification.
However, the present invention is not limited to this, and the magnification of all photographing optical systems including the conversion lens may be calculated, and the microphone directivity may be controlled based on the calculated value.

[0028]

As described above, the camera of the present invention is a converter.
Installed when shooting with a lens
Recognize the magnification of conversion lenses with a simple configuration
can do. Further, based on the calculated magnification of the conversion lens, the directivity and volume of the microphone that captures the audio signal recorded together with the video signal are controlled. It is possible to easily record the audio signal as the one in which the realistic sensation is emphasized.

[Brief description of drawings]

FIG. 1 is a camera-integrated VTR showing a first embodiment of the present invention.
FIG.

FIG. 2 is a block configuration diagram of a camera unit of the camera shown in FIG.

FIG. 3 is a diagram showing a change in focus position with respect to each zoom position of the camera shown in FIG.

4 is a flowchart of magnification calculation processing of the conversion lens of the camera of FIG.

5 is a block diagram of a voice input unit of the camera shown in FIG.

6 is a directivity pattern on each signal line of the audio input unit of the camera shown in FIG.

7 is a directivity pattern on an output line when the audio input unit of the camera of FIG. 1 is controlled to the wide side.

8 is a directivity pattern on an output line when controlled to the tele side in the audio input unit of the camera shown in FIG.

FIG. 9 is a diagram showing the directivity of a microphone when the conversion lens is not attached or when the camera is attached to the camera of FIG. 1;

FIG. 10 is a camera-integrated VT showing a second embodiment of the present invention.
The flowchart of the magnification calculation process of the R conversion lens.

FIG. 11 is a camera-integrated VT showing a third embodiment of the present invention.
FIG. 3 is a block configuration diagram of an R camera unit.

FIG. 12 is a cross-sectional view around a conversion lens mounting detection switch unit arranged in the lens unit of the camera of FIG.

[Explanation of symbols]

1 ............... Camera controller (magnification recognition means) 12a .................... Bidirectional microphone (microphone) 12b .... …………… Super-directional microphone (microphone) 13h …………………… Directivity control unit (microphone characteristic adjustment means) 22 ………………… Conversion lens

Continuation of front page (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/222-5/257

Claims (3)

(57) [Claims] 1. A lens unit to which a conversion lens can be attached, a zoom unit provided to the lens unit, and the lens unit for each zoom position at a predetermined object distance when the conversion lens is not attached. Memory storing table data indicating focus position data of the lens, focus position data of the lens unit with respect to a zoom position at a predetermined subject distance detected with the conversion lens attached , in response to's over <br/> zoom position calculating the magnification of the lens unit loaded conversion lens on the basis of the relationship between the focus position data in the non-mounted state of the conversion lens obtained from the table data A multiplying factor calculating means, and the mounted one calculated by the multiplying factor calculating means. Microphone directivity based on the magnification information of the down versions lenses, and / or a camera and a microphone characteristic adjustment means for adjusting the sound volume, comprising the. 2. A lens unit to which a conversion lens can be attached, zoom means provided to the lens unit, and the lens unit for each zoom position at a predetermined object distance when the conversion lens is not attached. Memory storing table data indicating focus position data of the lens, focus position data of the lens unit with respect to a zoom position at a predetermined subject distance detected with the conversion lens attached , in response to's over <br/> zoom position calculating the magnification of the lens unit loaded conversion lens on the basis of the relationship between the focus position data in the non-mounted state of the conversion lens obtained from the table data A camera characterized by comprising a magnification calculation means for performing. 3. A lens unit to which a conversion lens can be attached, and table data indicating focus position data of the lens unit with respect to each zoom position at a predetermined subject distance when the conversion lens is not attached are stored. In a method of calculating a magnification of the conversion lens of a camera including a memory, focus position data of the lens unit with respect to a zoom position at a predetermined subject distance detected with the conversion lens attached, and the detection magnification's over <br/> the lens unit loaded conversion lens on the basis of the relationship between the focus position data of the corresponding to the zoom position in a non-mounted state of the conversion lens obtained from the table data of time A method for calculating the magnification of a camera, characterized by calculating.