JPS61248681A - Vibrationproofing camera - Google Patents

Abstract

PURPOSE:To obtain a light and small vibrationproofing camera without deteriorating an original optical performance and with preventing a picture shaking of wide range by supporting freely and rotatably a photo-graphing lens device against a camera cabinet and correcting a shaking with driving the photographing lens device according to the output of a detecting means which detects the shaking of a lens device. CONSTITUTION:The output of a photoelectric transducer 2 is inputted to a picture shaking detection circuit 8b through a signal process circuit 8a. At this stage, by measuring a correlation between pictures which are shifted with each other for a regulated time, the size and the volume of the picture shaking are detected and a control signal is given to a driving control circuit 8c. The driving control circuit 8c drives, with receiving the signal, motors 5a and 5b in the direction to deny the picture shaking. Therefore, a correction is performed as stated above even when disturbance is put on an outer package member 6 and as a result, so that a lens system 1 and the photoelectric transducer 2 are maintained at a face to face position against an object, a stable picture without shaking is obtained.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a camera having an anti-shake function.

<Conventional technology> Shooting while walking or on a moving vehicle tends to cause the camera to shake, making it difficult to view the shooting screen.Furthermore, shooting in a place with a lot of vibration tends to cause blurring in the image, making it difficult to obtain useful images. I can't do it. Moreover, these problems become more pronounced as the focal length of the lens system becomes longer.

As a means to prevent such problems caused by image blur, it is possible to decenter a part of the lens system by detecting the tilt angle of the entire optical system, that is, the blur of the optical system, or to change the thickness of each lens as described in Japanese Patent Publication No. 59-26930. A method has been proposed in which two optical elements defined by a certain relational expression are provided in the optical path of a photographing lens and the optical elements are shifted to prevent image blur. However, in the former, the amount of light fluctuates due to eccentricity, and in the latter, at least one optical element is placed in front of a normal lens system, so the optical element must be larger than the diameter of the front lens. The drawback is that the entire system becomes heavy and large. In addition, a so-called Dynalens method has been proposed to correct image blur by controlling the apex angle of a liquid prism, but due to its structure, the angle of image blur that can be corrected is small, and it is Therefore, as the angle increases, chromatic aberration occurs.

In addition, as mentioned above, in contrast to the method of optically preventing image blurring, there is a method in which a gyro is used as a camera with an anti-shake device to ensure that the camera is always fixed in the direction of gravity, and a camera is attached. A method has been proposed in which the entire camera including the photographic lens is driven according to the acceleration and angular velocity of an electric pan head detected by an acceleration sensor. In this method, the above-mentioned optical blurring of the image is prevented (“Servo-type camera vibration isolation device” NHK Giken Monthly Report vol. 1.27. No. 11
Unlike the P23-2B (1984) method, this method does not cause variations in the amount of light, does not make the entire optical system heavy and large, and does not cause chromatic aberration. However, in the camera shown in such a proposal, not only the photographing lens but also the entire camera housing including the control device inside the camera is driven by a motor, so the entire camera including the anti-shake device becomes large, so it is not like an ENG camera. However, it had the disadvantage that it could not be used when shooting hand-held.

<Objective of the Invention> An object of the present invention is to provide a light and compact anti-shake camera that can prevent image blur over a wide range without deteriorating the original optical performance.

Based on this object, the present invention supports a photographic lens device having a photographic lens system and a light receiving means for receiving light incident through the photographic lens so as to be rotatable with respect to a camera housing, and prevents blurring of the lens device. The camera is characterized in that the camera is equipped with a control means for correcting blur by driving the photographic lens device according to the output of the detection means.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the present invention, and the second
The figure is a block diagram showing a general configuration. 1 is a lens system including a hood, and 2 is a photoelectric conversion element, which is a light receiving means for receiving light incident through the lens system l. A gimbal structure 3 is a means for supporting the lens system 1 and the photoelectric conversion element 2, and is composed of two axes 31a, 31b and 32a, 32b (not shown) and an annular member 33. Shaft 31a
, 31b are fixed to the annular member 33 at one end, and the other ends are the upper surface 6a and the lower surface 6 of the exterior member 6, respectively, which are camera casings.
It is rotatably attached to b. Moreover, the shaft 32a,
One end of the lens 32b is fixed to the lens barrel of the lens system l, and the other end is rotatably attached to the annular member 33. Therefore, the lens system l and the photoelectric conversion element 2 are
.

It is rotatably supported in any direction of y or z. 4a
, 4b are worm gears with shafts 32a and 31, respectively.
The driving force of the motors 5a and 5b is transmitted through the worm wheels 34 and 35 fitted to the worm wheels 34 and 35, and the lens system 1 and the photoelectric conversion element 2 are rotated around the two axes of the gimbal 3.

The motor 5a is fixed to the annular member 33 of the gimbal, and the motor 5b is fixed to the bottom surface 6b of the camera exterior member 6. 7 is a signal transmission member that transmits the output of the photoelectric conversion element 2 to a circuit board 8 including a signal processing circuit 8a shown in FIG. 2, an image blur detection circuit 8b, and a drive control circuit 8C; This is a coaxial cable for transmitting data to the monitor 10 etc. shown in FIG. In FIG. 2, a photographic lens device having a photographic lens system 1 and a photoelectric conversion element 2 is shown as 30.

The operation of the anti-shake camera of this embodiment configured as above will be explained below.

In FIG. 2, the output of the photoelectric conversion element 2 passes through a signal processing circuit 8a and enters an image blur detection circuit 8b. Here, the magnitude and direction of image blur are detected by correlating images separated by a certain time, and a control signal is provided to the drive control circuit 8C. The drive control circuit 8C receives the control signal and drives the motor 5 (5a, 5b in FIG. 1) in a direction to cancel image blur. Therefore, even if a disturbance is applied to the exterior member 6 of the camera, the correction is performed as described above.
As a result, the lens system 1 and the photoelectric conversion element 2 are kept directly facing the subject, so that a stable image without blur can be obtained.

In addition, in the above embodiment, a method of taking a correlation using an image signal was mentioned as an image blur detection means, but the lens system l
An acceleration sensor may be attached to the lens barrel, and the control signal to the drive control circuit 8C may be changed according to its output. Further, the means for rotatably supporting the photographing lens device 30 consisting of the lens system 1 and the photoelectric conversion element 2 is not limited to the gimbal structure 3 as shown in FIG. It is not limited to combinations. For example, as a means for rotatably supporting the photographic lens device 30, a universal joint may be used to connect a shaft having one end fixed to the photographing lens device and a shaft having one end fixed to the camera housing; The driving means may be a driving means for driving a shaft having one end fixed to the photographing lens device.

<Effects of the Invention> As explained above, the present invention is achieved by a detection means that rotatably supports a photographic lens device having a lens system and a photoelectric conversion element with respect to a camera housing and detects a single image blur. Since the relative positions of the lens system and the photoelectric conversion element with respect to the camera housing are controlled according to the blur signal, the following effects can be obtained.

l) There is no need to decenter a part of the lens system or insert a prism, so there is no deterioration in optical performance due to changes in light amount or chromatic aberration. Furthermore, the correction range can be widened.

2) Since the objects of drive control are only the lens system and the photoelectric conversion element, the power of the drive system can be small, and as a result, the entire camera can be made smaller and lighter.

3) The entire camera has been made smaller, allowing hand-held shooting with a long focal length lens, allowing stable images without blur to be obtained when hand-held shooting while walking, and even when on a moving vehicle or in a place with a lot of vibration. You can obtain stable images without blur even when shooting. Additionally, even beginners who are not used to handheld photography can take images with almost no blur.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a schematic configuration of the embodiment of FIG.

Claims (1)

[Claims] A photographic lens device having a photographic lens system and a light receiving means for receiving a light flux incident through the photographic lens, a means for rotatably supporting the photographic lens device with respect to a camera housing, and a means for driving the photographic lens device. An anti-shake camera comprising a driving means, a detecting means for detecting shake of the photographing lens device, and a control means for operating the driving means in accordance with the output of the detecting means to correct the shake. .