JPH07175105A - Camera provided with muffler - Google Patents

Abstract

PURPOSE:To perform photographing without hesitation to a human to be photographed and people in the vicinity by eliminating the working noise of a camera. CONSTITUTION:A shutter driving circuit 3 is provided between a CPU 1 and a shutter 2. The inversion signal of the vibrating waveform of the working noise of the camera previously acquisitioned is stored in a storing circuit 4 connected to the CPU 1. A vibration driving element 6 is provided in the vicinity of the source of the working noise(shutter), and the inversion signal outputted from the CPU 1 can be outputted as vibration. When the working noise occurs by pressing the shutter, the CPU 1 reads the inversion signal from the storing circuit 4 and makes the vibration having a phase opposite to that of the vibrating waveform of the working noise occur from the vibration driving element 6. When the vibrating waveform of the working noise and the vibrating waveform having the opposite phase simultaneously occur, both waveforms are synthesized to eliminate the working noise. It can be applicable to the elimination of film winding and rewinding noise, etc., in addition to the shutter. As an other means, the vibration of the noise source is detected by the vibration detecting element, the inversion signal is made to occur, so that synthesis can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called muffler-equipped camera provided with a device for erasing camera operating noise such as shutter operating noise.

[0002]

2. Description of the Related Art In recent cameras, hoisting / rewinding and zoom adjustment are automated, and each of these operations is performed by a motor incorporated in the camera. The photographer can take a desired photograph simply by putting the subject in the viewfinder and pressing the shutter.

[0003]

When the photographer presses the shutter, operating sounds such as the operating sound of the shutter, the rotating sound of the hoisting / rewinding motor and the zoom motor, and the frictional sound due to the friction between the members are generated. The operation sound of the shutter, the filming sound of the film, and the like are sometimes necessary to indicate that the shutter is released, but are usually treated as noise.

[0004] For example, a news photo during a golf swing,
When shooting during a lecture or speech, the shutter sound may interfere with the player's or speaker's ability to concentrate.
It often causes annoyance to the audience and audience.
Especially, since the operation sound of film rewinding is relatively long, such an influence is great.

Of these operating sounds, the frictional noise between the members can be prevented to some extent by using a cushioning material or an air damper. However, at present, no measures are taken to prevent the operation noise of the motor and the resonance noise generated from the shutter blades during shutter operation. Therefore, an object of the present invention is to eliminate the operating noise of the camera,
An object of the present invention is to provide a camera with a sound deadening device that does not cause trouble to the person to be photographed and the surrounding people.

[0006]

In order to achieve the above object, a camera with a silencer according to the present invention includes a memory circuit in which an inverted signal obtained by inverting a vibration waveform of an operating sound generated from the camera is stored. A vibration driving element, which is provided in a part of the camera and to which an inverted signal of a memory circuit is applied when the camera is operated, is provided.

Further, a camera with a sound deadening device as another means is a vibration detection element for detecting an operation sound generated from the camera, and an inverted signal obtained by inverting the vibration waveform detected by the vibration detection element. A waveform control circuit for outputting and a vibration driving element provided in a part of the camera and to which an inverted signal from the waveform control circuit is applied when the camera is operated are provided.

[0008]

When the camera is operated, an inversion signal obtained by inverting the vibration waveform of the operation sound generated from the camera stored in the memory circuit is read to vibrate the vibration driving element. This vibration waveform is combined with the vibration deformation of the operating noise of the camera and cancels each other out, so that the operating noise does not occur.

In another means, an operation sound generated from a camera is detected by a vibration detecting element, the detected vibration waveform is inverted by a waveform control circuit, and the inverted signal is applied to the vibration driving element to vibrate it. . Since this vibration waveform and the vibration waveform of the operating sound of the camera are combined and cancel each other, no operating sound is generated.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a camera provided with a silencer for operating noise according to this embodiment has a control circuit (hereinafter, abbreviated as “CPU”) 1 for controlling photographing conditions of the camera and a shutter 2 for opening and closing the shutter 2. A shutter drive circuit 3, a storage circuit 4 for storing an inverted waveform of shutter sound, a vibration element drive circuit 5, and a vibration drive element 6 are provided. Other CPU
1, a shutter trigger switch 7a and a mode changeover switch 7b for changing over between a normal mode and a mute mode.
Is connected.

A ROM is used as the memory circuit 4, and an inversion signal obtained by inverting the vibration waveform of the shutter sound of the camera, which has been collected in advance, is stored in this ROM. CPU1
Shutter trigger switch 7a
When the switch is turned on, it is possible to read the inverted signal from the memory circuit 4 and output it to the vibration element drive circuit 5. The vibration element driving circuit 5 can convert the inverted signal input from the CPU 1 into a change in voltage as a vibration waveform and apply this voltage to the vibration driving element 6. The vibration driving element 6 is provided in the vicinity of the sound source of the operation sound of the shutter 2, and an electric signal is applied from the vibration element driving circuit 5 when the shutter is operated, and the vibration driving element 6 has a phase opposite to the vibration waveform of the operation sound of the shutter 2. It is possible to generate vibration with a vibration waveform.

Next, the operation of the silencer in this embodiment will be described. First, an inversion signal obtained by inverting the vibration waveform of the operation sound of the shutter 2 is stored in the storage circuit 4 in advance. First, the mode changeover switch 7b is used to change over from the normal mode to the mute mode. Next, the subject is placed in the viewfinder and the shutter trigger switch 7a is pressed to operate the shutter blades 2a of the shutter 2. Switch 7
When a is pressed, the CPU 1 reads the inversion signal of the vibration waveform stored in the storage circuit 4 and outputs it to the vibration element drive circuit 5. This signal is applied to the vibration driving element 6 by converting it into a voltage change by the vibration element driving circuit 5.
As a result, the vibration driving element 6 causes a vibration having a phase opposite to the vibration waveform of the operation sound of the shutter 2. Therefore, the shutter 2
The vibration waveform of the operation sound and the vibration waveform generated from the vibration drive element 6 are combined and cancel each other, and the operation sound of the shutter is erased.

At this time, since there is a slight deviation between the time when the operation sound of the shutter 2 is generated and the time when the drive vibration element 6 is vibrated, a slight phase difference is generated in the vibration waveform between them. If it is left as it is, it will be difficult to completely erase it by combining the vibration waveforms. Therefore, this shift can be almost eliminated by providing a tracking circuit (not shown) for phase matching or adopting an open control in which a trigger is applied at the start of sound generation for phase matching.

An EEPROM is used in place of the ROM used as the memory circuit in this embodiment, and the operation sound peculiar to each camera is sampled at the camera manufacturing stage, and the inverted waveform of the vibration waveform of this operation sound is obtained. If you make it remember
When the vibration waveforms are combined, it is possible to almost completely erase by combining, so that the silencing effect can be further enhanced.

In this embodiment, only the operation sound of the shutter is erased. However, the operation sound is erased by eliminating the operation sounds of the hoisting / rewinding motor and the zoom drive motor. Are also applicable at the same time. In this case, vibration driving elements may be provided in the vicinity of the hoisting / rewinding motor and the zoom motor, respectively, so that the inverted waveforms of the respective operation sounds can be output from the respective vibration driving elements.

Next, another embodiment will be described. As shown in FIG. 2, in the present embodiment, in addition to the vibration driving element 16, a vibration detecting element 18 for detecting a vibration serving as a sound source of the operating sound of the shutter is provided near the sound source of the operating sound of the shutter 12. There is. The vibration detecting element 18 employs a piezoelectric element that catches the vibration of the sound source of the shutter 12 and can detect this as a change in voltage. The vibration detection element 18 is connected to the CPU 11 via the waveform control circuit 19.

When the vibration waveform detected by the vibration detecting element 18 is input, the waveform control circuit 19 is configured by an element having a function of shaping and inverting the vibration waveform and then outputting it as an inverted signal to the CPU 11. Other CPU 11
The shutter drive circuit 13 is provided between the shutter 12 and the shutter 12, and the vibration drive element 16 is provided near the sound source of the operation sound of the shutter 12 via the vibration element drive circuit 15 in the above embodiment. It has the same configuration as. The shutter trigger switch 17 operates in the same manner as the shutter 12.
a and the mode changeover switch 17b for switching between the normal mode and the mute mode.

Next, the operation of this embodiment will be described. When the viewfinder of the camera is aligned with the subject and the shutter trigger switch 17a is pressed after the mode changeover switch 17b is set to the mute mode, the shutter 12 is operated via the shutter drive circuit 13.

The vibration waveform of the vibration that is the sound source of the shutter operation sound generated at this time is detected by the vibration detection element 18, and this detection signal is input to the waveform control circuit 19 where it is shaped / inverted and inverted to the CPU 11. It is output as a signal. This inversion signal is applied to the vibration driving element 16 via the vibration element driving circuit 15, and vibrates the vibration driving element 16 to generate a vibration having a phase opposite to the vibration waveform of the operation sound of the shutter 12. At this time, the vibration waveform of the operation sound of the shutter 12 and the inverted vibration waveform of the vibration driving element 16 are phase-matched by a tracking circuit (not shown). As a result, both vibration waveforms are combined and cancel each other, so that the operation sound of the shutter is erased.

In this embodiment, only the shutter operation sound is explained as the object of noise reduction. However, in this case, in addition to the shutter operation sound, at the same time, the zoom operation sound and the film winding / It can be applied to eliminate rewinding operation sound and other operation sounds.

In this embodiment, the operation sound is erased. However, if all the operation sounds are erased, the photographer may not be able to discriminate whether or not the photograph is taken. Therefore, instead of deleting the operation sound of the camera, add a waveform other than the inverted waveform that deletes the operation sound when the camera is operating, and convert it to an operation sound that does not disturb the ears, for example, the operation sound of a classical camera, the sound of the natural world. It is also possible to shoot without making people uncomfortable.

[0022]

As described above, according to the present invention, the vibration driving element is provided in the vicinity of the sound source of the operating sound such as the shutter so that the vibration waveform of the operating sound is inverted. It is possible to eliminate the operating noise when using the camera. For this reason, it is possible to take pictures at any time and place without worrying about the person to be photographed and the people around them.

If a vibration detecting element is provided in the vicinity of the sound source of the operating sound, the vibration of the operating sound is detected, the detected vibration waveform is inverted, and this is immediately generated in the vicinity of the sound source. Since the vibration waveform of the operating sound and the waveform of the reversal vibration generated by the vibration driving element can be exactly in the opposite phase, the elimination of the operating sound becomes more effective.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of another embodiment.

[Explanation of Codes] 2,12 Shutter 4 Storage Circuit 6,16 Vibration Driving Element 18 Vibration Detection Element 19 Waveform Control Circuit

Claims (2)

[Claims] 1. A storage circuit in which an inversion signal obtained by inverting a vibration waveform of an operating sound generated from a camera is stored, and a storage circuit provided in a part of the camera, to which the inversion signal of the storage circuit is applied when the camera is operated. A camera with a sound deadening device, comprising a vibration driving element. 2. A vibration detecting element for detecting an operation sound generated from a camera, a waveform control circuit for outputting the vibration waveform as an inverted signal based on the vibration waveform detected by the vibration detecting element. And a vibration driving element to which the inverted signal from the waveform control circuit is applied when the camera is operated.