JPH0683392B2 - Imaging device - Google Patents

Description

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

2. Description of the Related Art In recent years, with the spread of video tape recorders (hereinafter referred to as VTRs), there are more opportunities to shoot with a video camera, and it is possible to perform stable camera work with little blur even without using a tripod. Video cameras are desired.

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 is disclosed in FIG. 6 as shown in Japanese Patent Laid-Open No. 53-64175.
The structure was as shown in Fig. 7. FIG. 6 is a front view of a conventional photographing apparatus, and FIG. 7 is a side view. Referring to FIGS. 6 and 7, there is a rotor case 1 having a rotor that rotates at a high speed as a directional gyro center, which is supported by a horizontal gimbal 3 on a horizontal axis 2 on the left and right, and the horizontal gimbal 3 is Gimbal axis 4 for vertical gimbal 5
Supported by. Similarly, in the vertical gyro, the central rotor case 6 is provided with the video camera 9 and the like on the rotor case 6 supported by the horizontal gimbal 7 and the vertical gimbal 8.

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, if you do hand-held shooting and you do not need to prevent image blur, you can stop the image blur prevention means such as a gyro. Since the horizontal gimbals 3 and 7 and the vertical gimbals 5 and 8 are no longer stable and the video camera becomes unstable, there is a problem that it is difficult to determine the desired shooting direction. Further, if the lens barrel or the video camera body is touched during image blur prevention, there is a problem that the effect of image blur prevention is reduced.

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, rotation supporting means for rotatably supporting the holding means in the tilting direction (or panning direction), a part of the holding means, and a locking portion A cover that has a cabinet and a locked portion that is locked by the locking portion of the cabinet, and that covers the portion of the holding means that is exposed from the cabinet, and detection that detects whether or not the cover is locked to the cabinet. And a locking means for locking the holding means when the cover is not locked to the cabinet by the detection signal of the detecting means.

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.
A dustproof effect can be obtained by attaching a cover to the cabinet so that the lens exposed from the cabinet covers the lens barrel. Also, in the image blur prevention state, since the lens barrel is facing the same direction even though the cabinet is shaking, it feels like the lens barrel is shaking, which is uncomfortable. By attaching it to the cabinet and covering the lens barrel, there is no discomfort. By attaching the cover, the hands and the like do not come into contact with the lens barrel, so that the image blur prevention effect is not hindered. Also, when removing the cover, the lens barrel is configured to be locked, so
When performing manual focusing or zooming, the operability is improved because the lens barrel is fixed. In addition, since it covers when you carry it, you can carry it with confidence.

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 partial cross-sectional view of the lens barrel of the image taking device, FIG. 2 is a block diagram of the entire image taking device, FIG. 3 is a cross-sectional view taken along the line XX of FIG. 2, and FIGS. , Second
It is an A section detailed sectional view in the drawing.

First, in FIG. 1, the focusing frame 11 includes focusing lenses 12, 13,
14 is inserted, and the surface distance between the focusing lenses 13 and 14 is regulated by the lens spacer 15. The focusing lenses 12, 13, 14 are fixed to the focusing frame 11 by a lens pressing ring 16. A focusing gear frame 18 having a focusing gear 17 is fixed to the focusing frame 11. The helicoid screw 19 provided on the focusing frame 11 is screwed to the helicoid screw 21 provided on the fixed barrel 20. By rotating the focusing frame 11 or the focusing gear frame 18 around the optical axis, these helicoid screws 19, 2
By 1, the focusing lenses 12, 13, 14 are extended in the optical axis direction. Further, by pressing a focus operation button (not shown), a focus motor (not shown) rotates, and a focus gear 17 and a focus gear frame 18 that engage with this focus motor (not shown) are By rotating around the optical axis, the focusing lenses 12, 13 and 14 are extended in the optical axis direction. And focusing lens 1
The focusing gear frame 18 for regulating the amount of extension of 2, 13, 14 in the optical axis direction has a notch portion for regulating the amount of extension.
22 and the fixed barrel 20 are provided with stoppers 23 that come into contact with the ends of the notches 22.

The variable power lenses 24, 25, 26 are inserted into the first lens holding frame 27, and the screw portion 29 of the holding ring 28 of the variable power lens 24 is screwed with the screw portion 30 of the first lens holding frame 27. Variable magnification lens
24, 25 and 26 are fixed to the first lens holding frame 27. The correction lens 31 is inserted into the second lens holding frame 32 and
33 is fixed by urging the correction lens 31 against the second lens holding frame 32. Further, the first lens holding frame 27 and the second lens holding frame 32 are fixed by the fixed barrel 20 and the pole support plate 34 to move in the optical axis direction.
Holes 36 and 37 for fitting with are provided, and the guide pole 35 is used as a guide to move in the optical axis direction. The cam barrel 38 slides on the inner peripheral side of the fixed barrel 20 to move the first lens holding frame 27 and the second lens holding frame 32 in the optical axis direction, and the first cam groove 39 and the second cam groove 39. It has a cam groove 40 and its position is regulated by the pole support plate 34. The pole support plate 34 is a pole support plate holding screw.
41 is fixed by being screwed into the screw portion 42 of the fixed barrel 20.

The first cam groove 39 and the second cam groove 40 provided in the cam barrel 38 are provided with a first cam groove 39 and a second cam groove 40, respectively, in order to restrict the positions of the variable power lenses 24, 25, 26 and the correction lens 31 on the optical axis. Cam pins 43, 4 screwed to the lens holding frame 27 and the second lens holding frame 32
4 is engaged and a pin 45 is planted in the cam barrel 38.

A zoom gear 47 is rotatably fitted around the optical axis in the zoom ring 46, and a pin 45 is engaged with a long groove (not shown) formed on the inner peripheral side. That is, when the zoom ring 46 rotates, the pin 45 engaged with the long groove (not shown) in the optical axis direction is driven and the cam barrel 38 rotates, so that the first lens holding frame 27 and the second lens holding frame are held. The positions of the variable magnification lenses 24, 25, 26 and the correction lens 31 in the frame 32 are regulated by the first cam groove 39 and the first cam groove 40, and zooming is performed. To zoom, press the zoom operation button (not shown) to zoom motor (not shown).
Rotates, and the rotational force is transmitted to the zoom gear 47 that engages with this zoom motor (not shown) to perform zooming.

Next, the overall configuration of the image pickup apparatus will be described with reference to FIGS. 2, 3, 4, and 5.

2 and 3, photographing lenses for photographing an object [focusing lenses 12, 13, 14, variable-magnification lenses 24, 25, 26, correction lens 31, fixed lens (not shown), master lens ( (Not shown)] and the CC provided on the focal plane of the taking lens.
The image pickup device 62 such as D is held by the lens barrel 63.
Further, the electric signal converted from the optical image by the image pickup device 62 is converted into a predetermined video signal by the video circuit 64. Ball bearings 65 and 66 are press-fitted into the upper portion 63a and the lower portion 63b of the lens barrel 63, respectively, so that rotation shafts 68 and 69 can be freely rotated from the top and bottom of the first frame 67 to the ball bearings 65 and 66, respectively. The fitted lens barrel 63 is rotatable with respect to the first frame 67. A ring-shaped magnet 71, which is magnetized as required, is fixed to the lower portion 63b of the lens barrel 63 via a back plate 70 made of a magnetic material. A stator winding 73 adhered to a stator flat plate 72 made of a magnetic material is fixed to the first frame 67 so as to face the magnet 71.

Further, in order to detect the rotational position of the lens barrel 63, a hall element 72a is provided on the stator flat plate 72 so as to face the magnet 71. Ball bearings 74 and 75 are press-fitted into the left and right sides of the first frame 67, and rotary shafts 77 and 78 are rotatably fitted to the ball bearings 74 and 75 from the left and right sides of the second frame 76, respectively. The lens barrel 63 and the first frame 67 are the second
It is rotatable with respect to the frame 76. On the right side of the first frame 67, a back plate made of magnetic material.
Ring-shaped magnet that is magnetized as required via 79
80 is fixed. A stator winding 82 adhered to a stator flat plate 81 made of a magnetic material is fixed to the second frame 76 facing the magnet 80. Also the first frame
A Hall element 81a is provided on the stator flat plate 81 so as to face the magnet 80 in order to detect the rotational positions of the 67 and the lens barrel 63 in the tilting direction. The lens barrel 63 has
An angular velocity sensor 83 for detecting the angular velocity in the panning direction is fixed, and a lens barrel 63 and an angular velocity sensor 84 for detecting the angular velocity in the tilting direction of the first frame 67 are attached to the first frame 67. It is fixed. The control circuit 85 controls the actuator 86 including the magnet 71 and the stator winding 73 for rotating the lens barrel 63 in the panning direction so that the output signals of the angular velocity sensors 83, 84 become zero, and the lens barrel 63 and First frame 67
An actuator 87 including a magnet 80 and a stator winding 82 for rotating the rotor in the tilting direction is drive-controlled.

To lock the lens barrel 63, use the lock switch 100
By turning on, electric power is supplied from the control circuit 85 to the motor 102 fixed to the lock board 101, and the motor 102 rotates. The rotational force of the motor 102 is transmitted to the lock gear 106 provided on the lock shaft 105 via a reduction mechanism including idler gears 103 and 104 provided on the lock base 101. The lock shaft 105 is slidably engaged with the support member 107, and the cam groove 107a provided on the support member 107 is engaged with the cam pin 105a provided on the lock shaft 105 to prevent the movement of the lock shaft 105. I'm guiding.

The end shape of the lock shaft 105 is spherical, and the optical axis of the lens barrel 63 and the photographing axis of the camera body coincide with each other by contacting the conical recess 94 provided at the rear portion of the lens barrel 63. Lock the lens barrel 63 as follows. The conical recess 94 provided at the rear of the lens barrel 63 is sized to come into contact with the lock shaft 105 in the rotation range of the lens barrel 63.

The focusing frame 11 of the lens barrel 63 and a part of the zoom ring 46 are exposed from the cabinet 49, which allows manual and electric focusing.

A female screw 49a is provided on the front surface of the cabinet 49 so that the cover 50 can be attached and detached.
A male screw 50a that is screwed with the 9a is provided. The cover 50 is fixed to the cabinet 49 by the female screw 49a and the male screw 50a, and covers the portion of the lens barrel 63 exposed from the cabinet 49.
In addition, on the subject side of the cover 50, an acrylic transparent plate 50
b is provided.

Further, the cabinet 49 has a detection pin 51 at a position in contact with the cover 50, and the detection pin 51 is biased by a spring 52 toward the subject. A switch 53 is provided at a constant distance from the detection pin 51, and the switch 53 is fixed to the cabinet 49 by a switch fixing plate 54 and a screw 55.

When the cover 50 is screwed into the cabinet 49, the detection pin 51 presses the switch 53 to turn on the switch 53, thereby detecting that the cover 50 is locked in the cabinet 49.

When the cover 50 is removed from the cabinet 49, the detection pin 51 stops pressing the switch 53 and the switch 53
Is turned off, and it is detected that the cover 50 has been removed from the cabinet 49.
Power is supplied to the motor 102 from the motor 102, and the motor 102 rotates in the direction in which the lens barrel 63 is locked to lock the lens barrel 63.

Regarding the imaging device configured as described above, the first
The operation will be described with reference to FIG. 2, FIG. 3, FIG. 4, 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). Lens barrel associated with this video camera
Angular velocity sensor 83 (panning direction), 84 shaking
(Tilting direction), the control circuit 85 supplies electric power to the stator windings 73, 82 of the actuators 86, 87 to control the outputs from the angular velocity sensors 83, 84 to be zero, Lens barrel for absolute coordinates
63 shaking is eliminated and horizontal and vertical image blur can be reduced. For example, if the lens barrel 63 shakes in the tilting direction (the direction of arrow I in FIG. 3), an angular velocity sensor that detects the shake in the tilting direction.
The control circuit 85 supplies electric power to the stator winding 82 of the actuator 87 so that the output of 84 becomes zero to control the drive in the direction opposite to the arrow I direction, thereby preventing the image blur 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 83 (panning direction) and the angular velocity sensor 84 (tilting direction) detect the amount of shake (angular velocity) to detect the angular velocity sensor in both directions.
The control circuit 85 supplies electric power to the stator windings 73 and 82 of the actuators 86 and 87 so that the outputs from the circuits 83 and 84 become zero, and it is possible to prevent image blurring in an oblique direction.

In the image blur prevention state, the lens barrel 63 faces the same direction even though the cabinet 49 is shaking,
It feels like the lens barrel 63 is swaying and feels uncomfortable. However, by attaching the cover 50 to the cabinet 49 and covering the lens barrel 63, the feeling of discomfort disappears. By attaching the cover 50, the lens barrel 63 is not touched by a hand or the like, so that the image blur preventing effect is not hindered. Further, by attaching the cover 50 to the cabinet 49 so as to cover the lens barrel 63 exposed from the cabinet 49, a dustproof effect can be obtained.

When the cover 50 is removed from the cabinet 49, the detection pin 51 stops pressing the switch 53 and the switch 53 is turned off.
The detection signal is transmitted to the control circuit 85, and the control circuit 85 causes the lock motor 102 to move to the lens barrel 63.
The lens barrel 63 is locked by supplying electric power in a direction to lock the lens barrel 63. As a result, even when the cover 50 is removed and manual focusing or zooming is performed, the lens barrel 63 is fixed and operability can be improved.

When carrying or when turning off the image blur prevention effect, when the lock switch 100 is turned on, the control circuit 85 supplies electric power to the motor 102 to rotate the motor 102. The rotational force of the motor 102 is transmitted to a lock gear 106 provided on a lock shaft 105 via a reduction mechanism including idler gears 103 and 104, and a cam pin 105a provided on the lock shaft 105 is supported by a support member 107.
The cam shaft 107a is used as a guide to move the lock shaft 105 in the optical axis direction (the direction of arrow H), and the lock shaft 105 is brought into contact with a conical recess 94 provided in the rear portion of the lens barrel 63 so as to contact the lens barrel 63.
Lock so that the optical axis of and the shooting axis of the camera body for the subject match. When the lock is completed, the control circuit 85 shuts off the power supply to the actuators 86, 87 and the motor 102.

Also, when turning on the image blur prevention effect, turn off the lock switch 100, and the control circuit 85 first turns on the motor 10
Power is supplied to 2 to rotate the motor 102. motor
The rotational force of 102 is transmitted to the lock gear 106 provided on the lock shaft 105 via the reduction mechanism including the idler gears 103 and 104, and the cam pin 105a provided on the lock shaft 105 guides the cam groove 107a of the support member 107 to lock the lock shaft 105. Is moved in the optical axis direction (the direction opposite to the arrow H) to separate the lock shaft 105 from the conical recess 94 provided in the rear portion of the lens barrel 63, and the lens barrel 63 is separated.
To unlock. After that, the control circuit 85 supplies electric power to the actuators 86 and 87 to enter the image blur prevention state.

When performing zooming, press the zoom operation button (not shown) to zoom motor (not shown)
Rotates to drive the zoom gear 47 of the lens barrel 63 to drive the first lens holding frame via the zoom ring 46 and the cam barrel 38.
27 and the second lens holding frame 32 are moved in the optical axis direction for zooming.

In the case of focusing, when the image blur prevention function is ON, the focus motor (not shown) is rotated by pressing the focus operation button (not shown) and is provided on the focusing frame 11 of the lens barrel 63. By driving the focusing gear 17 thus obtained, the focusing frame 11 is rotated and the focusing lens is moved in the optical axis direction for focusing. When the image blur prevention function is OFF, or when the cover is removed and the camera is in the locked state, the focusing frame 11 is manually rotated to focus. Alternatively, a focus operation button (not shown) is pressed to electrically focus.

As described above, according to the present embodiment, the photographing lens for photographing the subject, the photoelectric conversion unit for converting the optical image from the photographing lens into an electric signal, and the holding unit for integrally holding the photographing lens and the photoelectric conversion unit. Means, rotation supporting means for rotatably supporting the holding means in the tilting direction (or panning direction), a cabinet that covers a part of the holding means and has a locking portion, and a locking portion of the cabinet. A cover having a locked portion to be locked and covering a part of the holding means exposed from the cabinet, a detecting means for detecting whether the cover is locked in the cabinet, and a detecting means for detecting the detecting means. According to the signal, since the cover is configured with the locking means that locks the holding means when the cover is not locked to the cabinet, the overall size and weight of the image capturing apparatus can be reduced, and handheld image capture can be performed easily. Door can be. Then, a dustproof effect can be obtained by attaching a cover to the cabinet so as to cover the lens barrel exposed from the cabinet. Also, in the image blur prevention state, the lens barrel faces the same direction even though the cabinet is shaking,
It feels as if the lens barrel is swaying, but it feels strange, but by attaching the cover to the cabinet to cover the lens barrel, the feeling of strangeness disappears. By attaching the cover, the hands and the like do not come into contact with the lens barrel, so that the image blur prevention effect is not hindered. Further, even when the cover is removed for manual focusing or zooming, the lens barrel is locked by removing the cover, which improves the operability. You can also carry it with confidence.

EFFECTS OF THE INVENTION A photographing lens for photographing an object as described above, a photoelectric conversion unit for converting an optical image from the photographing lens into an electric signal,
Holding means for integrally holding the taking lens and the photoelectric conversion means, rotation supporting means for rotatably supporting the holding means in the tilting direction (or panning direction), and a part of the holding means, and A cabinet having a locking portion,
A cover that has a locked portion that is locked by the locking portion of the cabinet and that covers the holding means, a detection means that detects whether the cover is locked in the cabinet, and a detection signal of the detection means. Since the cover is provided with the lock means that locks the holding means when the cover is not locked to the cabinet, the entire imaging apparatus becomes small and lightweight, and handheld imaging can be performed easily. Then, a dustproof effect can be obtained by attaching a cover to the cabinet so as to cover the lens barrel exposed from the cabinet. Also, in the image blur prevention state, the lens barrel is facing the same direction even if the cabinet is shaking, so it feels as if the lens barrel is fluttering, but there is a feeling of discomfort, but with the cover attached to the cabinet By covering the lens barrel, the feeling of discomfort disappears. By attaching the cover, the hands and the like do not come into contact with the lens barrel, so that the image blur prevention effect is not hindered. Further, even when the cover is removed for manual focusing or zooming, the lens barrel is locked by removing the cover, which improves the operability. You can also carry it with confidence.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a lens barrel portion of a photographing device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of the photographing device, FIG. 3 is a sectional view taken along line XX of FIG. 2, FIG. Figure 5 shows Figure 1 to Figure 2
FIG. 6 is a detailed sectional view of a portion A in the figure, FIG. 6 is a front view of a conventional photographing apparatus, and FIG. 7 is a side view of the conventional photographing apparatus. 11 …… Focusing frame, 49 …… Cabinet, 49a …… Female screw, 5
0 …… Cover, 50a …… Male screw, 50b …… Transparent plate, 51 ……
Detection pin, 53 …… switch, 63 …… lens barrel, 71, 80
...... Magnet, 73, 82 ...... Stator winding, 83, 84 …… Angular velocity sensor, 85 …… Control circuit, 86, 87 …… Actuator.

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 a holding means for integrally holding the photographing lens and the photoelectric conversion means. By the rotation support means for rotatably supporting the holding means in the tilting direction (or the panning direction), the cabinet that covers a part of the holding means and has the locking portion, and the locking portion of the cabinet. A cover having a locked portion to be locked and covering a portion of the holding means exposed from the cabinet; a detection means for detecting whether the cover is locked in the cabinet; An image pickup apparatus comprising: lock means for locking the holding means when the cover is not locked to the cabinet according to a detection signal of the means.