JPH04237268A - Image pickup device - Google Patents

Abstract

PURPOSE:To attain effective image deflection correction suitable for a mount state even when an accessory such as a converter is mounted in an image pickup lens system. CONSTITUTION:This device is provided with an image pickup means converting an optical image formed on an image forming face with an image pickup optical system 2 into a picture electric signal, a deflection detection means 10 detecting the deflection of the device main body, and an optical axis means to deflect an optical axis for varying the image forming position of optical image on the image forming face. Moreover, the device is also provided with a drive means 11 to drive the optical axis deflection means based on an output of the deflection detection means 10, a characteristic detection means detecting the configuration and the characteristic of the image pickup optical system 2 and a control means 9 controlling the drive means 11 based on output information of the characteristic detection means to correct the optical axis deflection. The presence of a converter 8a and magnification information are detected by a mount (magnification) detector 8b and fed to a magnification correction circuit 8c.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging device such as a video camera.

0002

[Prior Art] In recent years, video cameras have become smaller and lighter.
With the increase in magnification and multi-functionality, its popularity has been remarkable.

[0003] In the above-mentioned video camera, most of the functions related to image capturing are automated, so that failures in image capturing due to the functions of the video camera itself are extremely rare.

By the way, it is no exaggeration to say that in the hand-held position that is most often used with a video camera, the screen is always blurry, and along with the degradation of image quality due to such screen blur,
Unpleasant situations such as video sickness have become a problem in recent years.

As a means for solving the above-mentioned image blur, there has conventionally been an image stabilizing device using a gyro mechanism.

[0006] In this device, a lens barrel system is moved by a gyro mechanism to obtain a stable image, and this device has the problem that the camera body becomes large and heavy.

Therefore, in recent years, optical axis decentering means such as a variable apex prism, which decenters the optical axis of the imaging optical system according to camera shake to position an optical image on a predetermined imaging plane of the imaging device, has been developed. An imaging device including an image blur correction means configured as described above has been developed.

The variable apex angle prism described above has a structure in which a liquid having a constant refractive index is sealed inside an accordion-shaped container having a bellows sandwiched between two transparent plates. Then, the photographing optical axis is decentered by controlling the tilting of the transparent plate on the subject side by a drive mechanism consisting of a magnetic circuit.

In this way, in the above-mentioned device, since the optical axis is decentered by the variable apex angle prism, there is no need to move the lens barrel system, and the increase in size and weight of the camera body can be minimized. This makes it possible to obtain good images that effectively prevent image blur.

0010

[Problem to be Solved by the Invention] However, in the above-mentioned cameras and video camera systems, when accessories such as wide converters and teleconverters are attached to the front of the photographic lens system, the above-mentioned problems occur. Control based on detecting the amount of shake of the camera body causes excess or deficiency in shake correction, making it impossible to perform accurate and stable shake correction.

The present invention has been made to solve the above-mentioned problems, and provides an imaging device that can effectively perform image blur correction adapted to the situation even when accessories such as a converter are attached to a photographic lens system. The purpose is to provide

0012

[Means for Solving the Problems] In order to solve the above-mentioned problems, according to the imaging device of the present invention, an imaging device converts an optical image formed on an imaging plane by an imaging optical system into an image electric signal. a shake detecting means for detecting the amount of shake of the apparatus main body; an optical axis decentering means for decentering the optical axis to vary the imaging position of the optical image on the image forming surface; A driving means for driving the optical axis decentering means based on the output; a characteristic detecting means for detecting the configuration and characteristics of the imaging optical system; and a characteristic detecting means for controlling the driving means based on the output information of the characteristic detecting means. and control means for correcting the amount of shaft eccentricity.

Further, according to the imaging apparatus of the present invention, in order to solve the above-mentioned problems, an imaging means for converting an optical image formed on an imaging plane by an imaging optical system into an image electric signal;
a shake detection means for detecting the amount of shake of the apparatus main body; an optical axis decentering means for decentering the optical axis to vary the imaging position of the optical image on the image forming surface; and an output of the shake detection means. a driving means for driving the optical axis decentering means based on the image pickup optical system; a detection means for detecting attachment of the converter to the imaging optical system and a magnification; and, when the attachment of the converter is confirmed by the detection means, magnification information of the converter; and a control means for controlling the eccentric drive amount of the drive means to be corrected based on the information from the converter information output means.

[0014]

[Operation] This allows information on accessories such as wide converters and teleconverters attached to the front of the imaging optical system,
In other words, it is possible to mechanically or electrically detect whether the converter has been installed or not, and the converter's magnification. Based on this information, a variable apex prism (VA) can be installed according to the converter's magnification.
P:Variable Angle Prism)
Corrects the deflection angle of the apex angle, enabling accurate image blur correction.

[0015]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

FIG. 1 is a block diagram for explaining an imaging apparatus according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a variable apex prism (VAP) which is an optical axis decentering means.
le Prism), whose structure is 2 as mentioned above.
A liquid is sealed between parallel transparent plates. 2
is an imaging optical system having an imaging lens 2a including a focusing lens and an aperture 2b. The imaging lens 2a is driven and controlled by a focus drive circuit 3, and the aperture 2b is driven by an iris drive circuit 4a and an iris control circuit 4b to control the amount of light incident on the imaging optical system.

Reference numeral 5 denotes a CCD that photoelectrically converts the subject image formed on the imaging plane by the imaging optical system 2 into an imaging signal.
6 performs gamma correction on the video signal amplified by a preamplifier (not shown) and outputted from the CCD 5.
This is a camera processing circuit that performs predetermined processing such as blanking processing and addition of synchronization signals, converts it into a standardized standard television signal, and outputs it from a video output terminal. The television signal output from the camera process circuit 6 is output to a video recorder section (not shown) and is also supplied to a monitor 7 such as an electronic viewfinder.

Reference numeral 8a is a converter attached to the front part of the imaging optical system 2 to change the focal length thereof, and the presence or absence of the converter 8a and magnification information are detected by an attached (magnification) detector 8b. It is sent to the magnification correction circuit 8c.

The magnification correction circuit 8c performs a signal calculation to make the deflection angle of the VAP apex angle approximately K times the magnification K of the attached converter, and transmits the calculation to the control circuit 9. This correction calculation is due to the fact that when the angle of view increases by K times, even if the amount of movement of the subject image is the same, the amount of movement on the imaging plane becomes K times that of normal shooting.

Reference numeral 9 denotes a control circuit composed of, for example, a microcomputer, which controls the entire system, and includes an I/O port, an A/D converter, and an R
Consists of OM and RAM. This control circuit 9 receives a detection signal from a shake detection sensor 10 that detects the amount of shake of a camera body, which is an imaging device, and also receives a signal MODE indicating an operation mode from a video recorder section (not shown).
is input, a signal for correcting the optical axis is calculated according to the amount of shake detected by the shake detection signal from the shake detection sensor 10 and the operating mode of the video camera body, and a drive control signal is output to the VAP drive circuit 11. At this time, since the deflection angle of the VAP apex angle is corrected to about K times the converter magnification K in accordance with the signal from the magnification correction circuit 8c, accurate deflection correction is possible. The control circuit 9 also outputs a control signal CONTROL to a video recorder section (not shown) to control it.

FIG. 2 is a flowchart showing the control operation of the control circuit 9, in which the VA is adjusted based on information from the mounting (magnification) detector 8b, the magnification correction circuit 8c, and the shake detection sensor.
It controls the P drive circuit 11 and optimizes the VAP shake correction when the converter is installed.

In the figure, first, when the power of the video camera body, which is an imaging device, is turned on (step 1),
), the status of the REC pause is confirmed (step 2).
), if it is the REC pause, it is checked whether the image stabilization mode is set (step 3). That is, the shake correction operation is not set in any mode other than the REC mode including the REC pause state. If it is in anti-shake mode, it is checked whether a converter is attached to the photographic optical system (step 4), and
If it is installed, its magnification information is read (step 5), and if it is not installed, the magnification is set to 1 (step 6) and the vibration isolator is driven (step 7). Next, it is confirmed whether or not a recording operation is being performed (step 8), and if a recording operation is being performed, a control signal CONTROL is output to a video recorder (not shown) to enter a recording state (step 9). ). When it is determined by the MODE signal that a REC pause operation has been performed based on the recording state (step 10), it is confirmed whether a power OFF operation has been performed (step 11), and whether or not a power OFF operation has been performed is confirmed. For example, the series of control operations is completed (step 12).
), if the power is not turned off, it is confirmed whether the converter has been replaced (step 13). If it has been replaced, return to confirming that the converter is installed (step 4).
If it has not been replaced, the process returns to driving the vibration isolator (step 7) and continues the control operation.

As described above, according to the imaging device of the present invention,
Even when the converter is attached, image blur correction for the subject to be imaged can be effectively performed.

[0025]

As explained above, the imaging device of the present invention solves the problem that when a converter is attached, the control that detects and outputs the amount of shake of the camera body may result in excess or deficiency in shake correction. By detecting , and the magnification and correcting the deflection angle of the variable apex prism, it is possible to appropriately and accurately correct the deflection during photographing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an imaging device according to an embodiment of the present invention.

FIG. 2 is a flowchart of a series of processing related to photographing when the converter is attached.

Claims (3)

[Claims] Claims: 1. An imaging means for converting an optical image formed on an imaging surface by an imaging optical system into an image electrical signal; a shake detection means for detecting an amount of shake of an apparatus main body; Optical axis decentering means for decentering the optical axis to vary the imaging position of the optical image; driving means for driving the optical axis decentering means based on the output of the shake detection means; and a configuration of the imaging optical system. and a characteristic detecting means for detecting a characteristic, and a control means for controlling the driving means based on output information of the characteristic detecting means and correcting an amount of optical axis eccentricity. [Claim 2] In claim (1),
An imaging apparatus according to claim 1, wherein the detection means is configured to detect attachment and magnification of a converter to the imaging optical system. 3. Imaging means for converting the optical image formed on the imaging surface by the imaging optical system into an image electric signal, shake detection means for detecting the amount of shake of the apparatus main body, and an optical axis decentering means for decentering the optical axis to vary the imaging position of the optical image; a driving means for driving the optical axis decentering means based on the output of the shake detecting means; a detection means for detecting attachment of the converter and a magnification; a converter information output means for outputting magnification information of the converter when the detection means confirms attachment of the converter; and a converter information output means for outputting magnification information of the converter based on information from the converter information output means. An imaging device comprising: a control means for controlling the eccentric drive amount of the drive means to be corrected by the control means.