JPH0628409B2 - Imaging device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing device. With the spread of video tape recorders (hereinafter referred to as VTRs) in recent years, there have been more and more opportunities to shoot with a video camera, and it is possible to perform stable camera work with less blur even without using a tripod. Is being requested.

2. Description of the Related Art Hereinafter, an example of the above-described conventional imaging device will be described with reference to the drawings. Conventionally, a photographing apparatus of this type has a structure as shown in FIGS. 5 and 6 as shown in, for example, JP-A-53-64175. FIG. 5 is a front view of a conventional photographing apparatus, and FIG. 6 is a side view. 5 and 6
In the figure, there is a rotor case 1 having a built-in rotor that rotates at a high speed as a directional gyro, which is supported by a horizontal gimbal 3 on left and right horizontal shafts 2, and the horizontal gimbal 3 is vertically supported by left and right gimbal shafts 4. It is supported by the gimbal 5.

Similarly, in the vertical gyro, the center rotor case 6 is supported by the horizontal gimbal 7 and the vertical gimbal 8, and the video camera 9 and the like are installed on the rotor case 6.

Problems to be Solved by the Invention However, in the above-described configuration, since the gyro that rotates at high speed is used, the device becomes large in size and the weight also increases. Therefore, normally, the entire device must be installed and used. In addition to the problem of lack of mobility, when handheld shooting is performed and it is not necessary to prevent image blur, it is sufficient to stop the image blur prevention means such as a gyro. There is a problem in that the horizontal gimbals 3 and 7 and the vertical gimbals 5 and 8 lose their stability, and the video camera becomes unstable, which makes it difficult to determine the desired shooting direction. In addition, recent video cameras have a problem that it is difficult to operate because there are many operation switches.

Means for Solving the Problems In order to solve the above problems, the present invention relates to a photographing lens for photographing a subject, a photoelectric conversion unit for converting an optical image from the photographing lens into an electric signal, a photographing lens and photoelectric conversion. Holding means for integrally holding the holding means so that their optical axes coincide with each other, rotation supporting means for rotatably supporting the holding means in the panning direction (or tilting direction), and the holding means for panning. Direction (or tilting direction), drive means, swing detection means for detecting swing of the holding means, angle detection means for detecting a rotation angle of the holding means with respect to the rotation support means, and swing detection Means for controlling the drive of the drive means by the outputs of the means and the angle detection means, the first operation position for switching to the recording mode or the non-recording mode, and the pan for switching to the recording mode. The operating unit is configured to have a second operating position for switching between one of a non-following mode and a mode for following a training or tilting operation, and a second operating position for switching the amount of electric power supplied to the driving unit.

Effect The present invention does not use a large and heavy gyro as in the related art due to the above-mentioned configuration, so that it is easy to make the device small and lightweight, and the photographer can use it by hand.
Also, a switch for switching the recording mode and the pause mode of the VTR (hereinafter referred to as a recording switch), and a switch for switching the amount of power supply to the actuator for preventing image blur (hereinafter referred to as an image blur prevention switch). It is possible to reduce the number of operation switches and improve operability by integrating them.

Embodiment Hereinafter, an image pickup apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a photographing device, and FIG.
1 is a sectional view taken along the line XX 'in FIG. 1, FIG. 3 is a perspective view of the entire image taking apparatus, and FIG. 4 is a view taken in the direction of arrow K in FIG.

First, the configuration of the entire image capturing apparatus will be described with reference to FIGS. 1, 2, and 3.

In FIGS. 1, 2, and 3, a photographing lens 21 for photographing a subject and a C provided on the focal plane of the photographing lens
The image pickup device 22 such as a CD is held by the lens barrel 23. Further, the electric signal converted from the optical image by the image pickup device 22 is converted into a predetermined video signal by the video circuit 24. A ball bearing 2 is provided on each of the upper portion 23a and the lower portion 23b of the lens barrel 23.
5, 26 are press-fitted, and the rotation shafts 28, 29 are rotatably fitted to the ball bearings 25, 26 from the upper and lower sides of the first frame 27, respectively. It is rotatable with respect to. A ring-shaped magnet 31 that is magnetized as desired is fixed to the lower portion 23b of the lens barrel 23 via a back plate 30 made of a magnetic material. A stator winding 33 adhered to a stator flat plate 32 made of a magnetic material is fixed to the first frame 27 so as to face the magnet 31.

Further, in order to detect the rotational position of the lens barrel 23, a hall element 32a is provided on the stator flat plate 32 so as to face the magnet 31. Ball bearings 34 and 35 are press-fitted into the left and right sides of the first frame 27, respectively, and rotary shafts 37 and 38 are rotatably fitted into the ball bearings 34 and 35 from the left and right sides of the second frame 36, respectively. The lens barrel 23 and the first frame 27 are rotatable with respect to the second frame 36. Also,
On the right side of the first frame 27, a ring-shaped magnet 40 magnetized as required is fixed via a back plate 39 made of a magnetic material. A stator winding 42 adhered to a stator flat plate 41 made of a magnetic material is fixed to the second frame 36 so as to face the magnet 40. Further, in order to detect the rotational positions of the first frame 27 and the lens barrel 23 in the tilting direction, the stator flat plate faces the magnet 40.
The hall element 41a is provided at 41. Lens barrel 23
Is fixed with an angular velocity sensor 43 for detecting the angular velocity in the panning direction. In the first frame 27, the angular velocity for detecting the angular velocities of the lens barrel 23 and the first frame 27 in the tilting direction is fixed. The sensor 44 is fixed. The control circuit 45 so that the output signals of the angular velocity sensors 43 and 44 become zero, the actuator 46 including the magnet 31 and the stator winding 33 for rotating the lens barrel 23 in the panning direction, the lens barrel 23 and First frame
An actuator 47 composed of a magnet 40 and a stator winding 42 for rotating the 27 in the tilting direction is drive-controlled.

Then, in order to switch the power supply amount to the actuators 46, 47, the grip portion 48a of the photographing device main body 48 has an operation position for switching the recording mode and the non-recording mode of the VTR and an actuator for preventing the image blur. A recording / image blur prevention switch 49 having an operation position for switching the amount of electric power supplied to the actuator is provided. In the recording mode and the image blur prevention mode, the actuator 46 is set so that the detection signals of the angular velocity sensors 43 and 44 become zero. , 47 are controlled so as not to follow even during panning or tilting. Further, in the recording mode and in the panning or tilting mode (indicates image blur prevention (low) in FIG. 4), the relative angle between the camera body and the lens barrel 23 (outputs of the Hall elements 32a and 41a) becomes zero. The actuators 46 and 47 are driven and controlled so that the followability is improved even in the panning or tilting mode.

When locking the lens barrel 23, by turning on the lock switch 50, electric power is supplied from the control circuit 45 to the motor 52 fixed to the lock base 51, and the motor 52 rotates. The rotational force of the motor 52 is transmitted to a lock gear 56 provided on a lock shaft 55 via a reduction mechanism including idler gears 53, 54 provided on the lock base 51. Lock shaft
55 is slidably engaged with the support member 57, and the cam groove 57a provided in the support member 57 is engaged with the cam pin 55a provided in the lock shaft 55 to guide the movement of the lock shaft 55. Further, the end shape of the lock shaft 55 is spherical, and the optical axis of the lens barrel 23 and the photographing axis of the camera body are brought into contact with the conical recess 58 provided at the rear portion of the lens barrel 23. Lock the lens barrel 23 to match. The conical recess 58 provided in the rear portion of the lens barrel 23 is sized so as to come into contact with the lock shaft 55 in the rotation range of the lens barrel 23.

Further, the control circuit 45 includes a power failure detection unit (not shown) that detects a power failure, and a capacitor (not shown) that stores electricity when power is supplied from a VTR or the like.
When there is a power failure, the power failure detection unit in the control circuit 45 detects the power failure and the electricity stored in the capacitor is used as a motor.
By supplying it to 52, the motor 52 is rotated, and its rotational force is transmitted to the lock shaft 55 to lock the lens barrel 23.

A zoom switch 61 for zooming is provided above the grip portion 48a of the photographing apparatus main body 48, and a recording / image blur prevention switch 49 is provided on the side opposite to the subject. In addition, there is an electronic viewfinder 62 for confirming the captured image on the upper part of the photographing device body 60, and on the rear part,
A connector 63 is provided for connecting to the lock switch 50, the VTR and the like.

Regarding the imaging device configured as described above, the first
The operation will be described with reference to FIG. 2, FIG. 3, FIG.

When hand-held shooting is performed with a video camera, the video camera shakes due to camera shake or fatigue, which causes shaking of a shot image (so-called image blur). The vibration of the lens barrel 23 caused by this video camera is detected by the angular velocity sensor 43 (panning direction), 44
(Tilting direction), the control circuit 45 supplies electric power to the stator windings 33, 42 of the actuators 46, 47 so that the outputs from the angular velocity sensors 43, 44 become zero. Lens barrel 23 for coordinates
There is no shaking of the image and horizontal and vertical image blur can be reduced. For example, if the lens barrel 23 shakes in the tilting direction (the direction of arrow I in FIG. 1), the control circuit 45 causes the actuator 47 so that the output of the angular velocity sensor 44 that detects the shake in the tilting direction becomes zero.
By supplying electric power to the stator winding 42 to control the drive in the direction opposite to the arrow I direction, it is possible to prevent image blurring in the tilting direction. Similarly, in the panning direction, image blur can be prevented. When image blurring occurs in the diagonal direction, the angular velocity sensor 43 (panning direction) and the angular velocity sensor 44 (tilting direction) detect the amount of shake (angular velocity) and the angular velocity sensors 43, 44 in both directions are detected.
Since the control circuit 45 supplies electric power to the stator windings 33 and 32 of the actuators 46 and 47 so that the output from the actuator becomes zero, it is possible to prevent the image blur in the oblique direction.

If the amount of power supplied to the actuators 46 and 47 is increased to improve the image blur prevention effect, the lens barrel will not be used even if the photographer tries to perform panning or tilting.
Since the 23 does not follow the camera body and shoots in the same shooting direction, the photographer feels uncomfortable. In order to prevent this, a changeover switch for changing the power supply amount to the actuators 46, 47 is provided to reduce the power supply amount to the actuators 46, 47, and the relative angle between the camera body and the lens barrel 23 (Hall element 32a , 41a) to zero, the followability of the lens barrel 23 to the camera body during panning and tilting is improved.

When carrying around or turning off the image blur prevention effect,
When the lock switch 50 is turned on, the control circuit 45 supplies electric power to the motor 52 to rotate the motor 52. The rotational force of the motor 52 is transmitted to the lock gear 56 provided on the lock shaft 55 through the reduction mechanism including the idler gears 53 and 54, and the cam pin 55a provided on the lock shaft 55 is locked using the cam groove 57a of the support member 57 as a guide. The shaft 55 is moved in the optical axis direction (arrow H direction) and the lock shaft 55 is brought into contact with a conical recess 58 provided in the rear portion of the lens barrel 23, so that the optical axis of the lens barrel 23 and the subject of the camera body Lock to match the shooting axis. When the lock is completed, the control circuit 45 cuts off the power supply to the actuators 46, 47 and the motor 52.

When the image blur prevention effect is turned on, when the lock switch 50 is turned off, the control circuit 45 first supplies electric power to the motor 52 to rotate the motor 52. motor
The rotational force of 52 is transmitted to the lock gear 56 provided on the lock shaft 55 through the reduction mechanism including the idler gears 52, 54, and the cam pin 55a provided on the lock shaft 55 uses the cam groove 57a of the support member 57 as a guide. 55 is moved in the optical axis direction (the direction opposite to the arrow H) to separate the lock shaft 55 from the conical recess 58 provided in the rear portion of the lens barrel 23, and the lens barrel 23 is unlocked. After that, the control circuit 45 is an actuator
Power is supplied to 46 and 47 to prevent image blur.

Further, the control circuit 45 is configured with a power failure detection unit (not shown) that detects a power failure and a capacitor (not shown) that stores electricity when power is supplied from the VTR main body or the like. , The power failure detection unit in the control circuit 45 detects a power failure and supplies it to the electric motor 52 stored in the capacitor to rotate the motor 52, and the rotational force is transmitted to the lock shaft 55 to move the lens barrel 23. Lock it.

As described above, according to the present embodiment, the photographing lens for photographing the subject, the photoelectric conversion unit for converting an optical image from the photographing lens into an electric signal, and the photographing lens and the photoelectric conversion unit have the same optical axis. Holding means for integrally holding the holding means, a rotation supporting means for rotatably supporting the holding means in a panning direction (or a tilting direction), and a holding means driven in the panning direction (or a tilting direction). Driving means, swinging detection means for detecting swinging of the holding means, angle detection means for detecting a rotation angle of the holding means with respect to the rotation support means, and driving by the outputs of the swinging detection means and the angle detection means. Control means for controlling the drive of the means, a first operation position for switching to a recording mode or a non-recording mode,
And a second operation position for switching to one of a non-following mode and a mode for following the panning or tilting operation by switching to the recording mode, and a second operating position for switching the power supply amount to the driving means. As a result, the entire imaging device becomes smaller and lighter, and handheld shooting can be performed easily. By integrating the recording switch and the image blur prevention switch, the number of parts was reduced and the operability was improved.

Further, by providing a recording / image blur prevention switch having an operation position for changing the power supply amount to the actuator, the power supply to the actuator can be changed at the time of panning or tilting, so that the sense of discomfort of the photographer can be eliminated.

In addition, since the shooting axis of the camera body and the optical axis of the shooting lens coincide with each other when locked, it is possible to shoot without a sense of discomfort after locking. Furthermore, when the camera body loses power, for example, when the connector of the cable that supplies power from the VTR to the camera body is disconnected, the lens barrel becomes unstable inside the camera body. As a result, power can be supplied to the motor that drives the locking means by locking electricity in the control circuit with a capacitor, etc., so that the lens barrel is fixed to the camera body even when there is a power outage, and the lens barrel does not contact the exterior. You can carry it with confidence without contact.

In this embodiment, the slide switch is used as the recording / blurring prevention switch, but it is not limited to the slide switch and any switch having N (N ≧ 2) operation positions may be used. Further, although the recording switch and the image blur prevention switch are integrated, they may be integrated with a zoom switch or the like.

EFFECTS OF THE INVENTION As described above, the photographing lens for photographing a subject, the photoelectric conversion unit for converting an optical image from the photographing lens into an electric signal, and the photographing lens and the photoelectric conversion unit are integrated so that their optical axes coincide with each other. Holding means for holding the holding means, a rotation supporting means for rotatably supporting the holding means in the panning direction (or the tilting direction), and a driving means for driving the holding means in the panning direction (or the tilting direction) When,
Swing detection means for detecting swinging of the holding means, angle detection means for detecting a rotation angle of the holding means with respect to the rotation support means, swing detection means, and drive control of the drive means by outputs of the angle detection means. The control means, the first operation position for switching to the recording mode or the non-recording mode, the mode for following the panning or tilting operation by switching to the recording mode, and the non-following mode, and to the driving means. Second to switch the power supply
And the operation means having the operation position, the overall size and weight of the image capturing apparatus can be reduced, and handheld image capturing can be easily performed. Then, by providing a recording / image blur prevention switch having an operation position for changing the amount of power supplied to the actuator, the power of the actuator is changed during panning or tilting to change the power supply to the camera of the lens barrel during panning or tilting. The responsiveness to the main unit can be improved, and it is possible to shoot without any discomfort. Furthermore, by integrating the recording switch and the image blur prevention switch, it is possible to reduce the number of parts and improve operability.

[Brief description of drawings]

FIG. 1 is a block diagram of an image pickup apparatus in an embodiment of the present invention,
2 is a cross-sectional view taken along the line XX of FIG. 1, FIG. 3 is a perspective view of a conventional photographing device, FIG. 4 is a side view of the conventional photographing device, and FIG. 5 is a conventional photographing device. The front view and FIG. 6 are the same side views. 21 …… Shooting lens, 22 …… CCD, 23 …… Lens barrel,
45 …… Control circuit, 49 …… Recording / blurring prevention switch.

Claims (1)

[Claims] 1. A photographing lens for photographing an object, a photoelectric conversion means for converting an optical image from the photographing lens into an electric signal, and the photographing lens and the photoelectric conversion means are integrated so that their optical axes coincide with each other. Holding means for mechanically holding it, a rotation supporting means for rotatably supporting the holding means in the panning direction (or the tilting direction), and driving the holding means in the panning direction (or the tilting direction). Drive means, swing detection means for detecting swing of the holding means, angle detection means for detecting a rotation angle of the holding means with respect to the rotation support means, and the swing detection means and the angle detection means. Control means for controlling the drive of the drive means by output, a first operation position for switching to a recording mode or a non-recording mode, and a pannier for switching to the recording mode. A mode to follow the grayed or the tilting operation, the switch to one of the non-following mode, the photographing device and an operating means and a second operating position for switching the electric power supplied to the drive means.