JPH0683385B2 - 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 stable camera work can be performed without blurring the image without using a tripod. Video camera is required.

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 it is difficult to set the desired shooting direction because the effect is lost, the stability of the horizontal gimbals 3, 7 and the vertical gimbals 5, 8 is lost, and the video camera becomes unstable. Furthermore, 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 deteriorates.

Means for Solving the Problems In order to solve the above problems, the present invention converts a lens barrel including a photographing lens for photographing an object and a focusing operation unit, and an optical image from the photographing lens into an electric signal. The photoelectric conversion means, the holding means integrally holding the taking lens and the photoelectric conversion means so that their optical axes coincide with each other, and the lens barrel and the photoelectric conversion means in the tilting direction (or panning direction).
And a cabinet that covers the focusing operation section of the lens barrel so as to be exposed and has a first engaging section, and a first engaging section of the cabinet. And a cover for covering the lens barrel exposed from the cabinet.

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 as to cover the lens barrel exposed from the cabinet. Also, in the image blur prevention state, since the lens barrel is facing the same direction even if the cabinet is shaking, it feels as if the lens barrel is shaking, but it is uncomfortable, but the cover is on the cabinet. The discomfort can be eliminated by mounting the lens barrel to cover the lens barrel. 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. In addition, you can carry it around 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 configuration diagram of the entire image taking device, FIG. 3 is a cross-sectional view taken along the line XX of FIG. 2, and FIG. It is sectional drawing of an example. First, in FIG. 1, focusing lenses 12, 13 and 14 are inserted in a focusing frame 11,
The surface spacing between 13 and 14 is regulated by a 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 with 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, the focusing lenses 12, 13 and 14 are extended in the optical axis direction by these helicoid screws 19 and 21. Also, a focus operation button (not shown)
Focus motor (not shown) by pressing
Rotates, and the focusing gear 17 and the focusing gear frame 18 engaging with this focus motor (not shown) rotate around the optical axis to extend the focusing lenses 12, 13 and 14 in the optical axis direction. .
Then, in order to regulate the amount of extension of the focusing lenses 12, 13, 14 in the optical axis direction, the focusing gear frame 18 has a notch 22 for regulating the amount of extension and the fixed barrel 20 has a notch 22. There is provided a stopper 23 that comes into contact with the end of the.

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. Also, the first lens holding frame 27 and the second lens holding frame 32 are fixed barrels because they move in the optical axis direction.
Holes 36 and 37 that fit into a guide pole 35 fixed by 20 and a pole support plate 34 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, and the first lens holding frame 27 and the second lens holding frame 27.
It has a first cam groove 39 and a second cam groove 40 for moving 32 in the optical axis direction, and its position is regulated by the pole support plate 34. The pole support plate 34 is fixed by screwing the pole support pressing screw 41 with the screw portion 42 of the fixed barrel 20.

In the first cam groove 39 and the second cam groove 40 provided in the cam barrel 38, the first cam groove 39 and the second cam groove 40 are provided with the first cam groove 39 for restricting the positions of the variable power lenses 24, 25, 26 and the correction lens 31 on the optical axis. Cam pins 43, 44 screwed to the lens holding frame 27 and the second lens holding frame 32 are engaged with each other, 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 to rotate the cam barrel 38, 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 the first cam grooves 39
And the first cam groove 40 regulates the zooming. Zoom operation button (not shown) for zooming
Pressing causes a zoom motor (not shown) to rotate, and the rotational force is transmitted to the zoom gear 47 engaged with the zoom motor (not shown) to perform zooming.

Next, the overall configuration of the photographing apparatus will be described with reference to FIGS. 2 and 3.

2 and 3, photographing lenses (focusing lenses 12, 13, 14, focusing lenses 12, 25, 26, correcting lenses 31, fixed lenses (not shown), master lenses ( (Not shown)) and CC on the focal plane of the taking lens
The imaging element 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 provided on the upper portion 63a and the lower portion 63b of the lens barrel 63, respectively.
And the rotation shafts 68 and 69 are rotatably fitted to the ball bearings 65 and 66 from above and below the first frame 67. The lens barrel 63 is attached to the first frame 67 with respect to the first frame 67. It is rotatable. 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. The second facing the magnet 80
A stator winding 82 adhered to a stator flat plate 81 made of a magnetic material is fixed to the frame 76. Further, in order to detect the rotational positions of the first frame 67 and the lens barrel 63 in the tilting direction, the stator flat plate 81 faces the magnet 80.
A hall element 81a is provided in the. An angular velocity sensor 83 for detecting the angular velocity in the panning direction is fixed to the lens barrel 63, and the angular velocity in the tilting direction of the lens barrel 63 and the first frame 67 is detected in the first frame 67. An angular velocity sensor 84 for fixing is fixed. The control circuit 85 so that the output signals of the angular velocity sensors 83 and 84 become zero, the actuator 86 including the magnet 71 and the stator winding 73 that rotate the lens barrel 63 in the panning direction, the lens barrel 63, and the like. First frame
An actuator 87 including a magnet 80 and a stator winding 82 for rotating 67 in the tilting direction is drive-controlled.

A part of the focusing frame 11 and the focusing gear frame 18 of the lens barrel 63 is 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 lens barrel 63. An acrylic transparent plate 51 is provided on the subject side of the cover 50.

Further, when locking the lens barrel 63, a support member 91 having a female screw 90 is provided on the exterior 49, has a male screw 92 that is screwed into the female screw 90, and faces the lens barrel 63. By rotating the lock shaft 93, which has a spherical end shape in the direction of rotation, in the right-hand screw direction, the lock shaft 93 moves in the optical axis direction (direction of arrow H) using the female screw 90 and the male screw 92 as guides. The conical recess 94 provided at the rear of the lens barrel 63.
And the lens barrel 63 is locked. Also, the lock shaft
By rotating 93 in the left-hand screw direction, the lock shaft 93 moves in the optical axis direction (the direction opposite to the arrow H) using the female screw 90 and the male screw 92 as guides, and the cone provided in the rear part of the lens barrel 63. The lens barrel 63 is unlocked and separated from the concave portion 94 in the image blur prevention state.

Further, the lock shaft 93 is provided with a switch pressing portion 95, and the switch pressing portion 95 automatically turns on and off the switch 96 fixed to the support member 91 as the lock shaft 93 moves. It automatically controls the power supply to the actuators 86 and 87.

Regarding the imaging device configured as described above, the first
The operation will be described with reference to FIGS. 2, 3 and 4.

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 shaking of the lens barrel 63 caused by this video camera is detected by the angular velocity sensor 83 (panning direction), 84
(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 (direction of arrow I in FIG. 3),
The control circuit 85 drives the actuator so that the output of the angular velocity sensor 84, which detects shaking in the tilting direction, becomes zero.
By supplying electric power to the stator winding 82 of 87 to control the drive in the direction opposite to the arrow I direction, image blurring in the tilting direction can be prevented. Similarly, in the panning direction, image blur can be prevented. If image blurring occurs in the diagonal direction, the angular velocity sensor 83 (panning direction),
The angular velocity sensor 84 (tilting direction) detects the amount of shaking (angular velocity), and the angular velocity sensors 83, 8 in both directions are detected.
Since the control circuit 85 supplies electric power to the stator windings 73 and 72 of the actuators 86 and 87 so that the output from 4 becomes zero, 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 as if the lens barrel 63 is swaying and feels strange, but by attaching the cover 50 to the cabinet 49 and covering the lens barrel 63, the feeling of strangeness 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, cover the cabinet 49 so as to cover the lens barrel 63 exposed from the cabinet 49.
A dustproof effect can be obtained by attaching.

When carrying around or turning off the image blur prevention function, rotate the lock shaft 93 in the right-hand screw direction to
0, with the male screw 92 as a guide, the lock shaft 93 moves in the optical axis direction (direction of arrow H) and contacts the conical recess 94 provided at the rear portion of the lens barrel 63 to lock the lens barrel 63. .
At this time, the switch pressing portion 95 provided on the lock shaft 93 is a switch.
By turning ON 96, the power supply to the actuators 86 and 87 is cut off to reduce power consumption.

In addition, by rotating the lock shaft 93 in the left-hand screw direction, the lock shaft 93 moves in the optical axis direction (the direction opposite to the arrow H) using the female screw 90 and the male screw 92 as guides, and is moved to the rear part of the lens barrel 63. The lens barrel 63 is separated from the conical recess 94 provided.
Is in the unlocked state and is in the image blur prevention state. At this time, the switch pressing portion 95 provided on the lock shaft 93 causes the switch 96 to
When set to F, electric power is supplied to the actuators 86 and 87, and the image blur prevention state is set.

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 27 via the zoom ring 46 and the cam barrel 38.
Also, the second lens holding frame 32 is moved in the optical axis direction for zooming.

When focusing, when the image blur prevention function is ON, a focus motor (not shown) is rotated by pressing a focus operation button (not shown), and the focus frame 11 of the lens barrel 63 is provided. 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 cover 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 lens barrel including the taking lens and the focusing operation unit for taking an image of a subject, the photoelectric conversion unit for converting an optical image from the taking lens into an electric signal, the taking lens and the photoelectric lens. Holding means integrally holding the conversion means so that their optical axes coincide with each other, and rotation support means for rotatably supporting the lens barrel and the photoelectric conversion means in the tilting direction (or panning direction), A cabinet that covers the focusing operation portion of the lens barrel so as to be exposed and that has a first engaging portion; and a first engaged portion that engages with the first engaging portion of the cabinet, In addition, since the structure is provided with the cover that covers the lens barrel exposed from the cabinet, the entire photographing apparatus becomes small and lightweight, and handheld photographing 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, since the lens barrel is facing the same direction even if the cabinet is shaking, it feels as if the lens barrel is shaking, but it is uncomfortable, but the cover is on the cabinet. The discomfort can be eliminated by mounting the lens barrel to cover the lens barrel. 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. In addition, you can carry it around with confidence.

Next, a second embodiment of the cover portion will be described with reference to FIG.

In FIG. 4, a female screw 49 is attached to the object side of the cabinet 49.
a is provided, and a male screw 50a that is screwed with the female screw 49a is provided on the cover 50. By screwing the female screw 49a and the male screw 50a, the cover 50 is fixed to the cabinet 49.

A filter (not shown) is provided on the subject side of the cover 50.
Female screws 49b are provided for attaching accessories such as.

Generally, accessories such as filters are often attached to the lens barrel, but in the image pickup apparatus of this embodiment, when accessories such as filters are directly attached to the lens barrel in the image blur prevention state, the center of gravity of the lens barrel is reduced. Since the position moves, the image blur prevention effect decreases. However, even if the center of gravity is corrected electrically, the power consumption increases, which affects the shooting time.

Therefore, as in the second embodiment of the present invention, by attaching a cover to the cabinet and providing a screw portion to which accessories such as a filter can be attached to the cover, the effect of preventing image blur is not reduced, and the power consumption is also increased. Instead, accessories such as filters can be attached.

In the present embodiment, the cabinet and the cover are attached with screws, but the present invention is not limited to the screws, and any type can be used as long as the cover can be fixed to the cabinet.
For example, there is a fixing method using a spring or the like.

EFFECTS OF THE INVENTION As described above, the lens barrel including the taking lens for taking an image of a subject and the focusing operation unit, the photoelectric conversion unit for converting an optical image from the taking lens into an electric signal, and the taking lens and the photoelectric conversion unit are provided. A holding means integrally held so that the optical axes coincide with each other, a rotation support means for rotatably supporting the lens barrel and the photoelectric conversion means in the tilting direction (or panning direction), and the lens barrel. A cabinet that covers the focusing operation portion so as to be exposed and that has a first engaging portion, and a first engaged portion that engages with the first engaging portion of the cabinet, and that is exposed from the cabinet. With the configuration including the cover for covering the lens barrel described above, the overall size of the photographing apparatus becomes small and lightweight, and handheld photographing 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, since the lens barrel is facing the same direction even if the cabinet is shaking, it feels as if the lens barrel is shaking, but it is uncomfortable, but the cover is on the cabinet. The discomfort can be eliminated by mounting the lens barrel to cover the lens barrel. 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. In addition, you can carry it around with confidence.

By providing an engaging portion for attaching accessories such as filters on the subject side of the cover, accessories such as filters can be attached without reducing the effect of preventing image blur and increasing power consumption.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a lens barrel of an image taking apparatus according to an embodiment of the present invention, FIG. 2 is a configuration diagram of the image taking apparatus, and FIG.
FIG. 4 is a sectional view taken along line XX of FIG. 2, FIG. 4 is a sectional view of a cover portion according to a second embodiment, and FIG.
FIG. 6 is a side view of a conventional photographing device. 11 …… Focusing frame, 49 …… Cabinet, 49a …… Female screw, 5
0 …… Cover, 50a …… Male screw, 50b …… Female screw, 51 ……
Transparent plate, 63 …… Lens barrel, 71, 80 …… Magnet, 73,
82 …… Stator winding, 83,84 …… Angular velocity sensor, 85 ……
Control circuit, 86, 87 ... Actuator.

Claims (3)

[Claims] 1. A lens barrel including a photographing lens for photographing an object and a focusing operation section, a photoelectric conversion unit for converting an optical image from the photographing lens into an electric signal, the photographing lens and the photoelectric conversion unit. Holding means integrally holding the lens barrel so that their optical axes coincide with each other, rotation supporting means for rotatably supporting the lens barrel and the photoelectric conversion means in the tilting direction or the panning direction, and the lens mirror. A cabinet that covers the focusing operation section of the barrel so as to expose it and that has a first engaging section; and a first engaged section that engages with the first engaging section of the cabinet, and An imaging device comprising a cover that covers the lens barrel exposed from the cabinet. 2. The photographing apparatus according to claim 1, wherein the cover has a transparent member on a surface of the lens barrel facing the focusing lens. 3. The photographing apparatus according to claim 1, wherein the cover has a second engaging portion for engaging the accessory on the subject side.