JPH0628407B2 - Imaging device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to 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 less image blur even 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. 4 and 5, for example, as disclosed in Japanese Patent Laid-Open No. 53-64175. FIG. 4 is a front view of a conventional photographing device, and FIG. 5 is a side view. 4 and 5
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 a desired shooting direction because the effect is lost, the stability of the horizontal gimbals 3 and 7 and the vertical gimbals 5 and 8 is lost, and the video camera becomes unstable.

Means for Solving Problems The taking lens for taking an image of a subject, the photoelectric converting means for converting an optical image from the taking lens into an electric signal, and the taking lens and the photoelectric converting means are integrated so that their optical axes coincide with each other. Holding means for holding the holding means, and rotation supporting means for rotatably supporting the holding means in the pitching direction (or the yawing direction),
An exterior member that exposes at least a part of the holding means, a holding portion is provided in the holding means for hiding a gap between the holding means, and the rotation support means makes contact with the exterior even if the holding means is rotated. A surface of the shield portion facing the exterior and a surface of the exterior facing the shield so as not to contact each other are spherical, and the holding means and the rotation support means are covered with the exterior member. .

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.
Further, the inside of the camera body cannot be seen from the outside even when the lens barrel rotates inside the exterior, and there is a dustproof effect.

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, and FIG. 3 is a cross-sectional view taken along line XX of FIG.

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. Further, a focusing gear frame 18 having a focusing gear 17 is locked 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, these helicoid screws 19, 2
The focusing lens 12, 13, 14 is extended by 1 in the optical axis direction. Further, by pressing a focus operation button (not shown), a focus motor (not shown) rotates, and the focus gear 17 and the focus gear frame 18 that engage with the focus motor (not shown) are Focusing lens by rotating around the optical axis
12, 13, 14 are extended in the optical axis direction. And focusing lens 12, 1
In order to regulate the amount of extension of the optical axis direction of 3 and 14, the focusing gear frame 18 is in contact with the cutout portion 22 for regulating the extension amount and the end of the cutout portion 22 in the fixed barrel 20. A stopper 23 is provided.

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 moves with 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 second cam groove 39 and the second cam holding groove 32.
It has a cam groove 40 and its position is regulated by the pole support plate 34. The pole support plate 34 has a pole support plate holding screw 41
Are fixed by being screwed onto 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 first Cam pins 43 and 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)
Is driven and the cam barrel 38 is rotated, so that the variable magnification lenses 24, 2 in the first lens holding frame 27 and the second lens holding frame 32 are driven.
The positions of 5, 26 and the correction lens 31 are restricted by the first cam groove 39 and the first cam groove 40 to perform zooming. A zoom operation lever 48 is fixed to the zoom ring 46, and when zooming manually, the zoom operation is performed by rotating the zoom operation lever 48 around the optical axis.
In addition, when operating electrically, zoom operation button (not shown)
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.

Further, the zoom ring 46 has a spherical surface 51 facing the inner spherical surface 50 of the outer surface 49, having the same center as the center of the radius of curvature of the spherical surface 50, and having a radius of curvature smaller than that of the spherical surface 50.
There is a brim-shaped convex portion 52 having.

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

2 and 3, a photographing lens (focusing lens 12, 13, 14, variable-magnification lens 24, 25, 26, correction lens 31, fixed lens (not shown), master lens ( (Not shown)) and C provided on the focal plane of the taking lens.
The image pickup device 62 such as a CD 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. A ball bearing 6 is provided on each of the upper portion 63a and the lower portion 63b of the lens barrel 63.
5 and 66 are press-fitted, and rotation shafts 68 and 69 are rotatably fitted to the ball bearings 65 and 66 from above and below the first frame 67, respectively. It is rotatable with respect to. 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 to the left and right of the first frame 67, respectively, and rotary shafts 77 and 78 are rotatably fitted to the ball bearings 74 and 75 from the left and right 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 for rotating the lens barrel 63 in the panning direction, the lens barrel 63 and First frame
An actuator 87 including a magnet 80 and a stator winding 82 for rotating 67 in the tilting direction is drive-controlled.

In the zoom ring 46 of the lens barrel 63, even if the lens barrel 63 rotates about the rotation shafts 67, 69 and 77, 78, the lens barrel 63 does not come into contact with the inner spherical surface 50 of the front surface of the exterior 49 and a gap is formed. A brim-shaped convex portion 52 is provided so as to be constant. Further, the surface 51 of the flange-shaped convex portion 52 provided on the zoom ring 46 facing the inner spherical surface 50.
Is a spherical surface, and the center of its radius of curvature is the lens barrel
It is the center of rotation of 63. And the sphere inside the exterior 49
The radius of curvature of the spherical surface 51 of the flange-shaped convex portion 52 provided on the zoom ring 46 is smaller than the radius of curvature of 50.

Part of the focusing frame 11 and the focusing gear frame 18 of the lens barrel 63, and part of the zoom operation lever 48 and the zoom ring 46 are exposed from the exterior 49. This allows manual and electric focusing and zooming.

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. Automatically controls the power supply to 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 power to the stator windings 73, 82 of the actuators 86, 87 so that the outputs from the angular velocity sensors 83, 84 become 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 power to the stator winding 82 of 87 to control the drive in the direction opposite to the arrow I direction, image blur 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.
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, so that image blurring in an oblique direction can be prevented. When the lens barrel 63 rotates about the rotation shafts 71 and 72, the spherical surface 51 of the flange-shaped convex portion 52 provided on the zoom ring 46 of the lens barrel 63 and the spherical surface 50 on the inner side of the front surface of the exterior 49 are moved. The centers of curvature are the same, and the spherical surface 51 of the brim-shaped convex portion 52 is
Has a radius of curvature smaller than the radius of curvature of the spherical surface 50 of the exterior 49, and therefore always rotates with a uniform gap. As a result, the inside of the photographing device is not visible due to the rotation of the lens barrel 63, and a dustproof effect is produced. When carrying or turning off the image blur prevention effect, rotate the lock shaft 93 in the right-hand screw direction to turn the female screw 90 and the male screw 92.
Using as a guide, the lock shaft 93 moves in the optical axis direction (direction of the arrow H) and contacts the conical recess 94 provided in 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 turns on the switch 96 to cut off the power supply to the actuators 86 and 87 to reduce the 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 33 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, power is supplied to the actuators 86 and 87 and the image blur prevention state is set.

When zooming is performed when the image blur prevention effect is ON, pressing the zoom operation button (not shown) causes the zoom motor (not shown) to rotate and the lens barrel 63
Driving the zoom gear 47 of the zoom ring 46 and the cam barrel 38
Through the first lens holding frame 27 and the second lens holding frame
Move 32 in the direction of the optical axis for zooming. When the image blur prevention effect is OFF, the zoom operation lever 48 provided on the zoom ring 46 is manually rotated to perform zooming. Alternatively, zooming is performed electrically by pressing a zoom operation button (not shown).

In the case of focusing, when the image blur prevention effect is ON, a focus operation button (not shown) is pressed to rotate a focus motor (not shown), which 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 effect is OFF, 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 taking lens for taking an image of a subject, the photoelectric conversion means for converting an optical image from the taking lens into an electric signal, and the taking lens and the photoelectric conversion means have the same optical axis. And holding means for integrally holding the holding means, rotation supporting means for rotatably supporting the holding means in the pitching direction (or yawing direction), and an exterior member exposing at least a part of the holding means. The means is provided with a shield for hiding a gap from the exterior, and a surface of the shield facing the exterior so as not to come into contact with the exterior even when the holding means is rotated by the rotation support means, and the exterior. By making both the surface facing the shield part spherical and the holding means and the rotation support means covered by an exterior member, the overall size of the photographing apparatus becomes small and lightweight, and handheld photography is easy. Can be done. In addition, the spherical surface of the convex convex portion provided on the zoom ring of the lens barrel and the spherical surface inside the front surface of the exterior have the same center of curvature, and the radius of curvature of the spherical surface of the convex convex portion is However, since it is smaller than the radius of curvature of the spherical surface inside the exterior, it always rotates with a uniform gap. As a result, the inside of the photographing device is not visible due to the rotation of the lens barrel, and a dustproof effect is produced.
In this embodiment, the zoom ring and the brim-shaped convex portion are integrally formed, but the brim-shaped convex portion may be fixed to the zoom ring as a separate member. Further, although the brim-shaped convex portion is configured as the zoom ring, it may be provided at any distance as long as it has a constant distance from the exterior during zooming or focusing, and may be provided on, for example, a fixed barrel.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, 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 a photoelectric conversion unit. Holding unit that integrally holds the holding unit so that the optical axes thereof coincide with each other, a rotation supporting unit that rotatably supports the holding unit in the pitching direction (or the yawing direction), and an exterior that exposes at least a part of the holding unit. And a member,
The holding means is provided with a shielding portion for hiding a gap from the exterior, and a surface of the shielding portion facing the exterior so as not to come into contact with the exterior when the holding means is rotated by the rotation support means, and the exterior. By making both the surface facing the shield part spherical and the holding means and the rotation support means covered by the exterior member, the overall size of the photographing apparatus becomes small and lightweight, and handheld photographing can be carried out easily. You can Further, the spherical surface inside the front surface of the exterior and the spherical surface of the flange-shaped convex portion provided on the zoom ring of the lens barrel facing each other have the same center of curvature, and Since the radius of curvature is smaller than the radius of curvature of the spherical surface inside the front surface of the exterior, the exterior always rotates with a uniform gap. As a result, the inside of the photographing device is not visible due to the rotation of the lens barrel, and a dustproof effect is produced.

[Brief description of drawings]

FIG. 1 is a partial 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. 3 is a sectional view taken along line XX in FIG. FIG. 4 is a front view of a conventional photographing device, and FIG. 5 is a side view of the conventional photographing device. 11 …… Focusing frame, 46 …… Zoom ring, 49 …… Exterior, 50.5
1 ... spherical surface, 52 ... brim-shaped convex portion, 62 ... CCD, 63 ...
… Lens barrel, 71 ・ 80 …… Magnet, 73 ・ 82 …… Stator winding, 83 ・ 84 …… Angular velocity sensor, 85 …… Control circuit, 86 ・
87 …… Actuator.

Claims (2)

[Claims] 1. A photographic lens for photographing a subject, a photoelectric conversion means for converting an optical image from the photographic lens into an electric signal, and the photographic lens and the photoelectric conversion means are integrated so that their optical axes coincide with each other. Holding means for holding the holding means, rotation supporting means for rotatably supporting the holding means in the pitching direction (or yawing direction), and an exterior member exposing at least a part of the holding means. The means is provided with a shield for hiding a gap from the exterior, and faces the exterior of the shield so as not to come into contact with the exterior even when the holding means is rotated by the rotation support means. And a surface of the exterior facing the shield portion, both of which are spherical, and the exterior member covers the holding means and the rotation support means. 2. The photographing apparatus according to claim 1, wherein the holding means is provided with a focusing operation member or a magnification changing operation member in a portion exposed from the exterior member.