JP5934522B2 - Viewfinder pan / tilt mechanism - Google Patents

Description

  The present invention relates to a pan / tilt mechanism of a viewfinder provided in an imaging apparatus such as a television camera.

  A TV camera (imaging device) is provided with a viewfinder for a camera operator to visually recognize a video to be shot, and panning is performed so that the position of the viewfinder display surface can be easily adjusted according to the shooting direction. -A tilt mechanism is provided. As a conventional pan / tilt mechanism, for example, a pan / tilt mechanism described in Patent Document 1 is known. The pan / tilt mechanism described in Patent Document 1 is provided with a fixed base slidable in front of the camera at the upper rear side of the camera, and provided with a pan mechanism section including a pan rotating shaft and a pan rotating base on the fixed base. The pan mechanism of the pan mechanism is provided with a tilt mechanism having first and second tilt rotation shafts and arm members. In this pan / tilt mechanism, the tilt base is set after the fixed base is slid and fixed at an appropriate slide position according to the shooting direction of the camera, and the pan position (horizontal rotation position) is set by the pan mechanism. The display position of the viewfinder is adjusted to a position that is easy for the camera operator to visually recognize by setting the tilt position (vertical rotation position) of the viewfinder and the tilt angle of the display surface.

JP 2008-289010 A

  However, in the conventional pan / tilt mechanism described in Patent Document 1, for example, the viewfinder is set to a position slid to the front side of the camera as in horizontal angle (horizontal direction) shooting, which is a normal camera position. In this case, the distance between the viewfinder and the optical axis of the camera is increased by the amount of the slide mechanism. When a large box lens is connected to a handy camera using a system expander device and used as a studio camera, a pan / tilt mechanism is attached to the system expander device. In this case, the camera shape is slightly larger than that of the studio camera, and the distance between the camera operator and the rear end of the camera is closer than that of the studio camera. For this reason, if the viewfinder is positioned at the rear edge of the camera and tilted, the distance from the camera operator to the display surface position of the viewfinder becomes too close and the viewing angle becomes narrow, making it difficult to view the viewfinder display screen. Become. Furthermore, when the shooting direction of the camera is changed from, for example, a horizontal angle to an overhead angle (downward), two actions are required to tilt the viewfinder after sliding it from the camera front side to the camera rear end side. . Conversely, when the camera shooting direction is changed from the overhead angle to the horizontal angle, a tilt operation and a slide operation are required.

  For this reason, even when mounted on a system expander device, the viewfinder position can be as close as possible to the optical axis of the camera so that the line of sight matches the optical axis of the camera, and the viewing angle is not narrowed. There is a demand for a pan / tilt mechanism from the camera operator so that the distance to the viewfinder is not too short.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a viewfinder pan / tilt mechanism that can satisfy the demands of a camera operator even when the system expander is mounted. .

Therefore, the present invention provides a pan / tilt mechanism that adjusts the display surface position of the viewfinder of the imaging device, and a pan turntable that is disposed at the top of the imaging device and that can rotate in the pan direction around a pan rotation axis ; the proximal end pan Ru is rotatably supported on the rotary table, the view second tip tilt rotation shaft is provided for supporting the finder rotatably through a first tilt rotation shaft, And an arm member comprising an intermediate portion between the base end portion and the tip end portion , the arm member being rotated about the first tilt rotation axis, and the viewfinder being disposed behind the imaging device. When the second tilt rotation axis is positioned on the side, the second tilt rotation axis center is on the rear side of the image pickup apparatus with respect to the first tilt rotation axis center, and the second tilt rotation axis center is close to the image pickup apparatus on the front side of the image pickup apparatus . The tilt rotation axis center of In so that to positioned lower than the middle portion is the first tilt rotation center of the first tilt rotation center Do Ri and the arm member in an imaging apparatus front side of, shape of the arm member is substantially L It is formed in the shape .

According to the pan / tilt mechanism of the viewfinder of the present invention, when the shooting direction is changed, the viewfinder position can be moved in the front-rear direction of the camera simply by tilting about the first tilt rotation axis, so a slide mechanism is unnecessary. Thus, the viewfinder can be brought close to the optical axis by being brought close to the imaging device on the front side of the imaging device, the distance from the camera operator is not too close, and the display surface of the viewfinder can be easily seen. In addition, when the shooting direction is changed, the viewfinder can be set to a desired position with only one tilt operation around the first tilt rotation axis, so that the slide operation and tilt operation can be performed as in the conventional pan / tilt mechanism. The operability is better than that which requires two actions.

It is a side view which shows the state which mounted one Embodiment of the pan / tilt mechanism of this invention to the television camera. FIG. 2 is a top view of the pan / tilt mechanism of FIG. 1. It is the front view which looked at the pan / tilt mechanism of the same embodiment from the camera operator side. It is a side view which shows the state which removed the pan / tilt mechanism of embodiment same as the above from the television camera. FIG. 5 is a left side view of FIG. 4. It is a figure which shows the state which pan-operated the pan-tilt mechanism of embodiment same as the left horizontal direction from the state of FIG. FIG. 7 is a right side view of FIG. 6. It is explanatory drawing of the example of tilt operation at the time of the angle (upward direction) imaging | photography of the pan / tilt mechanism of embodiment same as the above. It is explanatory drawing of the example of tilt operation at the time of the angle | corner imaging | photography of the pan / tilt mechanism of embodiment same as the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 to 3 show an embodiment of the pan / tilt mechanism of the present invention, and show a state in which an imaging apparatus using a system expander device instead of a handy camera as a studio camera is mounted. 1 is a side view, FIG. 2 is a top view, and FIG. 3 is a front view seen from the camera operator side. 4 is a side view of the pan / tilt mechanism removed from the television camera, and FIG. 5 is a left side view of FIG.

  In the figure, the pan / tilt mechanism 1 of the present embodiment is attached to the rear part of a television camera 2 (imaging device). The television camera 2 is configured by assembling a camera body 4 of a handy camera and a large box lens 5 to a system expander device 3. The system expander device 3 is a device for substituting a handy camera as a studio camera for use in a broadcasting station or the like. The camera main body 4 and the box lens 5 of the handy camera are replaced with a camera mount plate 3A and a lens mounting portion. When attached to the 3B in a predetermined order, the bayonet mount provided on the optical mount on the box-shaped lens 5 side and the optical mount on the camera body 4 side can be connected through the opening provided in the lens mounting portion 3B. By operating the camera operation panels 3 </ b> C that are set in a proper state and arranged on both sides of the rear part of the system expander device 3, the handy camera can be used as a studio camera.

  The pan / tilt mechanism 1 is mounted on the upper surface of the system expander device 3 at the rear of the TV camera 2 so that the camera operator can adjust the position of the display surface 6A of the viewfinder 6 mounted on the TV camera 2 to an optimum position. Mechanism. The pan / tilt mechanism 1 includes a pan mechanism portion and a tilt mechanism portion.

  In the pan mechanism section, a pan rotation shaft 11 is mounted on the upper surface of the system expander device 3, and a pan turntable 12 for rotating the viewfinder 6 in the pan direction (horizontal direction) around the pan rotation shaft 11 rotates. It is provided to be movable. Although not shown, the pan mechanism 1A is provided with a lock mechanism for locking the rotation operation of the pan turntable 12.

  The tilt mechanism portion has a base end portion in the tilt direction (vertical direction) with respect to the pan turntable 12 via the first tilt rotation shafts 13a and 13b on the standing pieces 12a and 12b at both ends of the pan turntable 12, respectively. A pair of arm members 14a and 14b pivotally supported is provided, and second tilt rotation shafts 15a and 15b are provided at the distal ends of the arm members 14a and 14b, respectively, and a second tilt rotation shaft 15a is provided. , 15b, the viewfinder 6 is pivotally supported in a tilt direction (vertical direction) with respect to the pair of arm members 14a, 14b. Note that the first tilt rotation shafts 13a and 13b are configured such that, for example, thrust pressure is applied, and the arm members 14a and 14b can be fixed at a predetermined rotational position by inserting and removing the plunger.

  The pair of arm members 14 a and 14 b are formed in a bent shape that is convex toward the front side of the television camera 2. Specifically, as shown in FIG. 1, the arm members 14 a and 14 b are arranged in front of the camera from the base end side to the intermediate portion so as to avoid the viewfinder operation unit 6 </ b> B disposed on the side of the viewfinder 6. A substantially square shape that curves obliquely downward from the axis center of the first tilt rotation shafts 13a and 13b and slightly curves toward the rear side of the camera from above the intermediate portion to the tip portion. Is formed into a bent shape. By forming the arm members 14a and 14b in such a shape, when the viewfinder 6 is positioned on the front side of the camera, the axis centers of the second tilt rotation shafts 15a and 15b are the first tilt rotation shafts 13a. , 13b is positioned on the front side of the camera relative to the axis center of the second tilt rotation shafts 15a, 15b when the viewfinder 6 is positioned on the rear side of the camera, and the first tilt rotation shafts 13a, 13b. It comes to be located on the camera rear side with respect to the axis center.

  As the viewfinder 6, for example, a liquid crystal display monitor having a viewfinder operation section 6B, an operation handle 6C, etc. on the side surface and provided with hoods 6D on both sides of the display surface 6A and the upper peripheral edge is used. To do.

Next, a method for adjusting the position of the viewfinder 6 using the pan / tilt mechanism 1 of the present embodiment will be described.
As shown in FIG. 2, the pan / tilt mechanism 1 of the present embodiment has a pan rotating table 12 that can rotate 90 ° in the horizontal direction from the front-rear center line C of the TV camera 2 around the pan rotation shaft 11. Yes, it can be set to an arbitrary pan position within a range of 90 ° in the horizontal direction. FIG. 6 shows a state rotated 90 ° in the left horizontal direction in FIG. 7 is a right side view of FIG. After the camera operator sets an arbitrary pan position, the pan turntable 12 is fixed by a lock mechanism (not shown), and then the plunger is pulled out and the arm members 14a and 14b around the first tilt rotation shafts 13a and 13b. Is held in a rotatable state, the handle 6C, 6C is held, the viewfinder 6 is set to a desired height position, a plunger is inserted, and the arm members 14a, 14b are moved to the first tilt rotation shafts 13a, 13b. The viewfinder 6 is fixed at a predetermined tilt position. Thereafter, the viewfinder 6 is rotated in the direction of arrow A or B in FIG. 1 (upward or downward in the drawing) around the second tilt rotation shafts 15a and 15b, so that the tilt angle of the display surface 6A of the viewfinder 6 is increased. Adjust to the optimal position for the camera operator.

  For example, during horizontal angle shooting, the viewfinder 6 is set close to the camera body 4 on the front side of the television camera 2 as shown in FIG. When the television camera 2 is directed to the tilt angle (upward direction) shown in FIG. 8, for example, at 45 ° from the horizontal angle shooting state, the positions of the arm members 14a and 14b remain as shown in FIG. The viewfinder 6 is rotated in the direction of arrow A in FIG. 1 (upward in the drawing) around the second tilt rotation shafts 15a and 15b, and the display surface 6A of the viewfinder 6 is The position of the display surface 6A of the viewfinder 6 is adjusted so as to face the camera operator. Further, when the TV camera 2 is directed to the angle of the overhead view shown in FIG. 9, for example, 45 ° from the horizontal angle shooting state shown in FIG. 1, as shown in FIG. 1, the second tilt rotation shafts 15a and 15b The arm members 14a and 14b are arranged on the rear side of the TV camera 2 around the first tilt rotation shafts 13a and 13b so that the axis center is located on the rear side of the TV camera from the axis center of the first tilt rotation shafts 13a and 13b. Then, the viewfinder 6 is rotated about the second tilt rotation axes 15a and 15b in the direction of arrow A in FIG. 1, and the display surface 6A of the viewfinder 6 is moved to the camera operator. The position of the display surface 6A of the viewfinder 6 is adjusted so as to face each other.

  According to the pan / tilt mechanism 1 of the present embodiment, when the viewfinder 6 is positioned on the front side of the television camera 2 as in horizontal angle shooting, the axes of the second tilt rotation shafts 15a and 15b. Since the center is located on the front side of the TV camera from the axis center of the first tilt rotation shafts 13a and 13b, the position of the viewfinder 6 is far from the camera operator, and the viewing angle of the camera operator is widened. It becomes easy to visually recognize the display surface 6A. Further, since there is no slide mechanism, the position of the viewfinder 6 can be brought closer to the camera body 4 correspondingly, and the position of the viewfinder 6 is made closer to the optical axis of the TV camera 2 than the conventional pan / tilt mechanism. be able to.

  Even when tilting the angle, the center of the second tilt rotation shafts 15a and 15b is positioned on the front side of the TV camera from the center of the first tilt rotation shafts 13a and 13b. Even in the television camera 2 using the large system expander device 3, the position of the viewfinder 6 is too close to the camera operator as compared with the case where the arm member like the conventional pan / tilt mechanism is L-shaped. Since the viewing angle of the camera operator is not narrowed, the display surface 6A of the viewfinder 6 is easy to visually recognize.

  When the setting position of the viewfinder 6 is moved from the front side (rear side) to the rear side (front side) of the camera, the arm members 14a and 14b are rotated around the first tilt rotation shafts 13a and 13b. One action is sufficient, and the operability is better than in the case where two actions of slide operation and tilt operation as in the conventional pan / tilt mechanism are required.

  Then, according to the pan / tilt mechanism of this embodiment, the viewfinder position should be as close as possible to the optical axis of the camera so that the optical axis of the camera is aligned with the line of sight. Therefore, it is possible to satisfy the camera operator's request that the distance of the camera is not too close with a simple configuration without a slide mechanism or the like.

  In this embodiment, the shape of the arm member is a shape that is bent into a generally U-shape convex to the front side of the TV camera in order to avoid the viewfinder operation portion on the side of the viewfinder. The present invention is not limited to this. When the viewfinder is positioned on the rear side of the TV camera, the axis center of the second tilt rotation axis is positioned on the rear side of the TV camera with respect to the axis center of the first tilt rotation axis. Any shape can be used as long as the axis center of the second tilt rotation axis is located on the front side of the TV camera with respect to the axis center of the first tilt rotation axis when positioned on the side.

  Needless to say, the pan / tilt mechanism of the present invention can be applied not only to a television camera to which the system expander apparatus described in the present embodiment is applied, but also to a studio camera that does not use the system expander apparatus.

DESCRIPTION OF SYMBOLS 1 Pan / tilt mechanism 2 Television camera 3 System expander apparatus 4 Camera main body 5 Box-shaped lens 6 Viewfinder 6A Display surface 6B Viewfinder operation part 11 Pan rotating shaft 12 Pan rotating bases 13 and 13b First tilt rotating shafts 14a and 14b Arm members 15a and 15b Second tilt rotation axis

Claims (3)

In the pan / tilt mechanism that adjusts the display surface position of the viewfinder of the imaging device,
A pan turntable that is arranged at the top of the imaging device and is rotatable in the pan direction around a pan rotation axis ;
The proximal end pan Ru is rotatably supported on the rotary table, the view second tip tilt rotation shaft is provided for supporting the finder rotatably through a first tilt rotation shaft, And an arm member comprising an intermediate portion between the base end portion and the tip end portion ,
With
When the arm member is rotated about the first tilt rotation axis and the viewfinder is positioned on the rear side of the imaging device, the second tilt rotation axis center is more than the first tilt rotation axis center. becomes the imaging apparatus rear side, the second tilt rotation center is the Do Ri and the imaging apparatus front side of the first tilt rotation center when brought into close proximity to the imaging device by the imaging device front side in so that to position than the lower the intermediate portion of the first tilt rotation center of the arm member, the arm member is formed in a shape of substantially L, the viewfinder of the pan-tilt mechanism.   2. The viewfinder pan / rotation device according to claim 1, wherein the pan turntable is attached to the system expander device of the imaging device in which a box-shaped lens is assembled to a camera body of a handheld camera using a system expander device. 3. Tilt mechanism.   The pan / tilt mechanism of the viewfinder according to claim 1 or 2, wherein the arm member is bent so as to avoid a viewfinder operation unit arranged on a side of the viewfinder.