JPH02247625A - Displacement detecting sensor for photographing device - Google Patents

Abstract

PURPOSE:To detect the displacement of a camera main body in a non-contact state by making the incident position of a detecting light in a light receiving means deviate in the case that the camera main body is rapidly moved by the blurring, etc., caused by a photographer and detecting the displacement of the camera main body based on the incident position. CONSTITUTION:A displacement detecting sensor 10 is supported by plural supporting members 56 in the camera main body 54 so as to be freely rotated, and in the only case that the abnormal displacement occurs in the camera main body, the slide occurs between a spherical main body part 42 and a supporting ball 56a. In a photographing action, an LED 44 positioned on the upper part of the main body part 42 is driven to emit light, which is guided to the object side by a half mirror 50a, and the reflected light is guided to a light receiving sensor 48 passing through a prism 50. Then, in the case that the camera main body 54 is rapidly moved because of the blurring, etc., caused by the photographer, the deviation occurs between the main body part 42 and the supporting member 56, and the detecting light reflected on the object is made incident on the position which is deviated from the central part of the light receiving sensor 48. Thus, the displacement of the camera main body 54 is detected based on the deviation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sensor for detecting abnormal displacement of a video camera or the like.

[Conventional technology]

Some imaging devices such as video cameras are equipped with an auto stabilizer that corrects the angle and position of the imaging optical system according to the displacement of the camera body in order to prevent image shake due to camera shake. There is.

Conventional auto stabilizers use encoders, potentiometers, and the like as means for detecting mechanical displacement of the camera as an electrical signal.

[Problem to be solved by the invention]

However, when conventional detection means are used, mechanical contact between the sensor and the camera body, which is the object to be detected, is essential, which poses a problem in that there are many design restrictions.

In addition, it is difficult to detect displacements of the camera body in multiple directions with good responsiveness, and if this is attempted, the configuration becomes very am and there is a problem in that the camera itself becomes large.

(Object of the Invention) The present invention has been made in view of the above points, and an object of the present invention is to provide a displacement detection sensor that can detect displacement of a camera body without contact.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a light projecting means for projecting detection light outside the camera body, a light receiving means for receiving the detection light reflected from the outside, and a detection light for the light receiving means. The light receiving means and the light guiding means are arranged so that the incident position of the detection light on the light receiving means is shifted when the camera body moves suddenly due to camera shake or the like by the photographer. At the same time, the displacement of the camera body is detected based on the incident position of the detection light on the light receiving means.

Further, a distance measuring light receiving means for receiving the detection light emitted from the light projecting means is supported integrally with the light projecting means.

[Effect]

Since the present invention is configured as described above, the light collecting means follows the movement of the camera during normal camera operation in accordance with the movement of the subject, and in the case of sudden movement due to camera shake etc. of the photographer. Only this will cause misalignment with the camera body. Then, this shift is captured as a change in the light receiving position of the detection light in the light receiving sensor, and the displacement of the camera body can be detected based on this light receiving position.

Therefore, the displacement of the camera body in multiple directions can be easily and accurately detected without using a configuration that involves mechanical contact as in the prior art.

Further, if the light from the light projecting means is also used for distance measurement, there is no need to provide a light projecting means for autofocus, and the overall configuration of the imaging apparatus is simplified.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows the configuration of a video camera using the displacement detection sensor 10 according to this embodiment.

First, the overall configuration of the video camera will be briefly explained based on FIG.

The imaging unit 12 provided on the front side of the camera is composed of lenses 14 and 15 constituting a photographic lens system, an aperture 16 that adjusts the exposure amount, an optical low-pass filter 20, and a damage CCD 22 that images the subject. There is.

The lens 14 is a focus lens, and the AF control section 24
Focusing is performed by moving back and forth forward and backward by a drive section 14a that is controlled by the driving section 14a.

The aperture diameter of the diaphragm 16 that adjusts the exposure amount is adjusted by a driving means 16a controlled by the AE control section 26.

Further, the damage CCD 22 is driven and controlled by a CCD drive unit 28, and is configured to send a captured subject image to the video signal processing unit 30 as an electric signal.

The video signal processing section 30 performs image processing on the signal from the damage CCD 22 and supplies the video signal to the AE calculation section 32 and the recording section 33 .

The AE calculation unit 32 detects subject brightness from the video signal input from the video signal processing unit 30. - side, recording section 33
The video signal processing section 30 records the video signal supplied from the video signal processing section 30 on a predetermined recording medium (eg, magnetic tape) as image information.

Reference numeral 34 denotes a distance measuring sensor, which is fixed to the bottom surface of the main body 42 of the displacement detection sensor 10 (described later), receives light emitted from an LED 44, and sends a signal corresponding to the light receiving position via an amplifier 36. The distance measurement calculation section 38 is supplied with the signal.

The distance measuring unit 38 calculates the object distance based on the signal from the distance measuring sensor 34, and sends the result to the CPU as a distance measuring signal.
40.

The CPU 40 performs overall control of the entire video camera, and performs AE control based on the photometry signal from the AE calculation section 32.
It controls the E*J control section 26 and also controls the AF control section 24 based on the distance measurement signal from the distance measurement calculation section 38.

Next, the configuration of the displacement detection sensor 10, which is a feature of the present invention, will be explained.

As shown in FIGS. 1 and 3, the displacement detection sensor 10 includes a spherical main body 42 and a light emitting diode (light emitting diode) that emits detection light from the top of the main body 42.
LED) 44 and an LED located on the front of the main body 42
A lens 46 that emits light 44 toward the subject and collects the light reflected by the subject, and a detection aperture 42 fixed to the camera body 54 and formed at the rear of the body 42.
A light receiving sensor 4 receives reflected light from the subject through a.
8 and a half mirror 50a in the center
44 toward the subject and a prism 50 that guides the reflected light from the subject to the sensor 48.

Note that the LED 44 is an LED controlled by the CPU 40.
The light emission is driven by the D driving section 52.

The displacement detection sensor 10 configured as described above is rotatably supported within the camera body 54 by a plurality of support members 56. To be more specific, only when the spherical main body 42 comes into contact with a ball 56a rotatably provided at the tip of the support member 56 and an abnormal displacement occurs in the camera body, the gap between the main body 42 and the ball 56a occurs. This causes slippage to occur.

That is, when the camera body 54 moves at a slow speed comparable to normal camera operation, the main body 42 is maintained in a fixed state by the support member 56, and the camera body 54 does not move suddenly due to camera shake or the like by the photographer. Displacement (slip) occurs between the ball 56a and the main body portion 42 only when the ball 56a and the main body portion 42 are in contact with each other. Note that such adjustment of the slip limit is performed by pressing the ball 56a against the main body portion 42.

On the other hand, the detection signal of the light receiving sensor 48 is amplified by the amplifier 58 and then supplied to the displacement calculation section 60.
Then, the displacement of the camera body 54 is calculated based on this detection signal.

For example, as shown in FIG. 4, the signal from the light receiving sensor 48 is divided into four directions and inputted, and as shown in FIG. Based on the signal values from YL and Y2,
Calculate the displacement in each of the X direction and Y direction.

The displacement signal output from the displacement calculation section 60 is supplied to the CPU 40, and the CPU 40 outputs a correction signal to the stabilizer control section 62 based on this displacement signal. The stabilizer control section 62 controls the drive device 64 based on this correction signal to correct the angle of the imaging section 12 with respect to the subject.

Next, the operation and effect of the embodiment configured as above will be explained.

When photographing, when the power is turned on and a recording button (not shown) is pressed, light transmitted through the lenses 14, 15 and the optical low-pass filter 20 enters the imaging CCD 22, and a subject image is taken.

The CCD 22 supplies an electric signal corresponding to the incident light to the video signal processing section 30, and after image processing is performed by the video signal processing section 30, the image signal is supplied to the recording section 33 and the AE calculation section 32.

Then, the AE calculation section 32 calculates the brightness of the subject from the input image signal and supplies the result to the CPU 35. While adjusting the aperture diameter of the diaphragm 16, the imaging CC is
Controls the drive (light reception) time of D22.

Also, when the record button is pressed, the LED 44 lights up,
Detection light is emitted toward the subject.

Then, when the detection light reflected by the object enters the distance measurement sensor 34, the sensor 34 outputs a detection signal based on the incident position of the detection light to the distance measurement calculation section 38. Next, the distance measurement calculation section 38 supplies a distance measurement signal based on the signal from the sensor 34 to the CPU 40 . With CPU40,
Based on this distance measurement signal, the drive section 14a is controlled via the AF control section 24, and the focus lens 14 is adjusted forward and backward to perform focusing.

In such a photographing operation, when the camera body 54 is fixed at a fixed position or is moved during normal photographing operations, the displacement detection sensor 100 is moved by the pressing force of the support member 56 as shown in FIG. The main body portion 42 is fixed to the support member 56 and its position relative to the camera body 54 does not change.
Therefore, the detection light reflected by the object enters the center of the light receiving sensor 48, and the displacement calculating section 60 calculates the displacement of the camera body 54 as O, and the square section 12 maintains the reference position.

On the other hand, when the camera body 54 suddenly moves (vibrates) due to camera shake or the like by the photographer, the displacement detection sensor 10 tries to maintain the position before the camera shake without following this movement.
A misalignment occurs between the main body portion 42 of the displacement detection sensor 10 and the support member 56. Therefore, as shown in FIG. 7, the detection light reflected by the subject is incident on a position shifted from the center of the light receiving sensor 48 by a distance corresponding to the displacement of the camera body 54.

Next, the output signal of the light receiving sensor 48 at this time is divided into four as shown in FIG.
Detect the amount of displacement (angle) of 4. And CPU40.
By the action of the stabilizer control unit 62 and the drive device 64, the imaging unit 1 is rotated by an angle corresponding to the amount of displacement of the camera body 54.
2 to the camera body 54 is corrected. for example,
When the camera body 54 swings downward, the imaging unit 12 is turned upward to capture an image of the subject from directly in front.

Through the above-described operations, images are taken while correcting the displacement of the camera body 54, and the information of the photographed image is stored in the recording section 33.
The data is recorded on a predetermined recording medium via the .

In the displacement detection sensor IO of the above embodiment, the light receiving sensor 48 is fixed to the camera body 54 and the main body part 42 is rotatably supported, but on the contrary, the light receiving sensor is supported so as to be movable, The LED and prism may be fixed to the camera body.

Further, the light for detecting camera shake is not limited to the case where the light is projected onto the subject, and is not particularly limited as long as it is used as a reference.

〔Effect of the invention〕

As explained above, in the present invention, when the camera body moves suddenly due to camera shake, etc. of the photographer, the incident position of the detection light on the light receiving means is shifted by 4 degrees, so that the detection light on the light receiving means is shifted by 4 degrees. Since the displacement of the camera body is detected based on the light incident position, it is possible to detect the displacement of the camera body without contact.

Additionally, this significantly reduces constraints on the design of the camera compared to conventional mechanical detection methods, and has the effect that displacements in multiple directions can be easily detected with a simple configuration.

Furthermore, if autofocus is performed using the light from the light projecting means, there is an advantage that the configuration of the imaging device can be simplified.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of the video camera according to the embodiment. FIG. 3 is an assembled perspective view showing the configuration of main parts of the displacement detection sensor according to the embodiment. FIG. 4 is an explanatory diagram for explaining the operation of the embodiment. FIG. 5 is a block diagram showing the control configuration of main parts of the embodiment. 6 and 7 are cross-sectional views for explaining the operation of the embodiment. Displacement detection sensor imaging unit Distance sensor distance measurement calculation unit PU Main body light emitting diode (LED) Lens light receiving sensor prism Camera body support member Displacement calculation unit Stabilizer control unit driving device. 10(t ate>'t> 34(rinse t and once a month:>"6 dogs"

Claims (2)

[Claims] (1) Includes a light projection means for projecting detection light outside the camera body, a light reception means for receiving the detection light reflected from the outside, and a light guide means for guiding the detection light to the light reception means. , supporting the light receiving means and the light guide means so that the incident position of the detection light on the light receiving means is shifted when the camera body moves suddenly due to camera shake or the like due to camera shake by the photographer; A displacement detection sensor for a photographing device, characterized in that the displacement of a camera body is detected based on the incident position of detection light. (2) A photographing device according to claim 1, characterized in that a distance-measuring light receiving means for receiving detection light emitted from the light projecting means is supported integrally with the light projecting means. displacement detection sensor.