JP2008289010A - Pan/tilt mechanism of view finder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pan/tilt mechanism of a view finder in which an adjustable range of an inclination angle of a display surface of a view finder is fixed irrespective of a tilt position of the view finder and whose operability is excellent. <P>SOLUTION: The pan/tilt mechanism 20 which adjusts a display position of the view finder 30 of a video camera has a pan rotation base 42 which rotates in the pan direction centering around a pan rotational axis 41 provided at a fixed base 40 attached at a rear part of an upper part of a camera main body 3, the pan rotation base 42 is provided with an arm member 50a for support in which a first tilt rotational axis 45a for rotating the view finder 30 in the vertical direction along a circular arc locus and a second tilt rotational axis 60a for adjusting the inclination angle of the display surface of the view finder 30 are provided, and a tilt rotation regulation mechanism 70 which makes a movable range of the tilt direction of the view finder 30 constant irrespective of the tilt position of the arm member 50a for support in adjustment of the inclination angle of the display surface of the view finder 30 by the second tilt rotational axis 60a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pan / tilt mechanism for a viewfinder equipped in a TV camera or a video camera. Specifically, the tilt angle of the viewfinder can be adjusted in two stages, and the tilt angle of the display surface of the viewfinder can be adjusted. More specifically, the present invention relates to a pan / tilt mechanism in which a movable range in a so-called tilt direction is made constant, and a relatively large viewfinder can be mounted and operability is good.

  A TV camera is provided with a viewfinder for visually recognizing a video to be shot, and in recent years, a viewfinder using a liquid crystal display monitor has been used. FIG. 9 is a perspective view of a conventional TV camera equipped with a viewfinder, in which a camera body 3 with a lens 2 is attached to the camera mount device 1, and a pan support 4 is provided at the upper rear of the camera body 3. A pan support 4 is provided with a tilt support 5, and a tilt rotation shaft 5 a of the tilt support 5 is provided with a liquid crystal display monitor 6 having a hood 7. This viewfinder is equipped with a small camera sensor 8 for recognizing the camera operator. The sensor 8 tracks and recognizes the camera operator's face, is rotated by a tilt motor, and is automatically adjusted to an optimal position by rotating the tilt rotation shaft 5a, and the viewfinder is visually recognized by the camera operator. The position is controlled so that it is easy to do (see, for example, Patent Document 1).

  Further, the viewfinder pan / tilt mechanism proposed by the present applicant in FIG. 10 is improved in viewfinder operability and visibility. In the pan / tilt mechanism 10, a rotary base 12 is provided on a rotary member 11 provided at the upper rear part of the camera body 3, and a pan substrate 13 provided on the rotary base 12 is rotatably supported by a tilt rotary shaft 16. A support arm portion 15 that is supported is provided, a tilt rotation shaft 17 is provided at the tip of the support arm portion 15, and the viewfinder 9 with the hood 7 mounted on the tilt rotation shaft 17 is pivotally supported. Is supported by the supporting arm portion 15. The viewfinder 9 has a tilt angle A in a range obtained by combining the elevation angle A1 above the horizontal plane including the axis of the tilt rotation axis 16 and the depression angle A2 below the horizontal plane, and the axis of the tilt rotation axis 17 at the center of the viewfinder 9. The tilt angle of the display surface can be adjusted within the range of the tilt angle based on the tilt angle B that can be adjusted. This pan / tilt mechanism has a high degree of freedom in rotation in the pan direction, and restricts the rotation of the viewfinder 9 in the pan direction (horizontal rotation) when the tilt rotation shaft 16 of the support arm 15 reaches a predetermined tilt angle. A stopper mechanism for preventing interference with surrounding members including the camera body 3 is provided (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2000-307903 (full specification, full drawing) Japanese Unexamined Patent Publication No. 2006-295589 (full specification, drawings)

  The conventional viewfinder of FIG. 9 has a single tilt rotation axis of the liquid crystal display monitor, and there is a limit to the tilt adjustment angle. When shooting with the camera head facing downward, the viewfinder is a camera. Although the camera operator was not able to see the viewfinder display screen, it was difficult to see the viewfinder display screen. However, in the latter conventional pan / tilt mechanism, the viewfinder display screen was tilted and the camera operator It has been improved to be able to move to the position.

  However, in the pan / tilt mechanism shown in FIG. 10, the range in which the tilt angle of the display surface of the viewfinder 9 can be adjusted is that the tilt position of the support arm portion 15 is the tilt position of the viewfinder 9 set by the support arm portion 15. There is a drawback in that the widest case is at the highest position and the narrowness is at the lowest position, so that the viewfinder 9 is in any tilt position of the tilt angle A of the support arm portion 15. The movable range B is desired to be constant, and there is room for improvement.

  In recent years, large viewfinders have been used, and with the conventional pan / tilt mechanism, the support arm that supports the viewfinder is enlarged and protrudes abnormally from the camera body. When the viewfinder is rotated or the viewfinder is inadvertently operated, the camera body and its peripheral devices may come into contact with the liquid crystal display monitor or the camera body and its peripheral devices. Furthermore, if the pan / tilt mechanism has a shape projecting rearward, the viewfinder attached to the pan / tilt mechanism is positioned so that the camera body and its display screen are separated from the camera operator, making it difficult to operate. There were drawbacks and there was room for improvement.

  The present invention has been made in view of the above problems, and the adjustable range of the tilt angle of the display surface of the viewfinder is constant regardless of the tilt position of the viewfinder, and the viewfinder having good operability is provided. An object is to provide a pan / tilt mechanism.

  The present invention achieves the above-mentioned object, and the invention according to claim 1 is a pan / tilt mechanism for adjusting a display position of a viewfinder of a video camera, wherein the pan / tilt mechanism is located at an upper rear side of the video camera. A pan turntable that rotates in a pan direction around a pan rotation axis provided on a fixed stand mounted on the pan, and the pan turntable for turning the viewfinder up and down along an arcuate trajectory. A support arm member provided with a first tilt rotation axis and a second tilt rotation axis for adjusting the tilt angle of the display surface of the viewfinder, and displaying the viewfinder by the second tilt rotation axis Tilt that keeps the movable range in the tilt direction of the viewfinder constant regardless of the tilt position of the support arm member when adjusting the tilt angle of the surface The rolling regulating mechanism is pan-tilt mechanism of the viewfinder, characterized in that it comprises in the pan-tilt mechanism.

According to a second aspect of the present invention, the tilt rotation restricting mechanism is pivotally supported by a tilt rotation shaft provided in the vicinity of the first tilt rotation shaft, and a protrusion is provided at a tip portion thereof. A tilt angle regulating arm member that follows the movement of
A regulating member fixed to a side wall portion of the viewfinder, provided with an arcuate guide groove that is supported by the support arm and is engaged with the tilt angle regulating arm member;
2. The viewfinder pan / tilt mechanism according to claim 1, wherein a movable range in a tilt direction of the viewfinder is set according to a length of the guide groove.

  According to a third aspect of the present invention, the fixed base is provided with a slide mechanism that slides the viewfinder in the front-rear direction with respect to the video camera, and rotation of the viewfinder in the pan direction and front-rear movement by the slide mechanism. When the slide in the direction, the viewfinder includes a stopper member for restricting the range of rotation in the pan direction and the slidable range in the front-rear direction to prevent interference with surrounding members including the video camera. The pan / tilt mechanism of the viewfinder according to claim 1 or 2.

  According to a fourth aspect of the present invention, the stopper member is sandwiched between the tilt angle regulating arm members provided on both side walls of the viewfinder, and the stopper member adjusts the viewfinder to a predetermined tilt angle. 4. The viewfinder pan / tilt mechanism according to claim 3, wherein the pan / tilt mechanism of the viewfinder according to claim 3, wherein the pan / tilt mechanism of the viewfinder is controlled by contacting the fixed base and rotating the pan rotary base and the slide mechanism.

  According to a fifth aspect of the present invention, the pair of first tilt rotation shafts are respectively provided in bearing portions provided on the pan rotation table, and the pair of first tilt rotation shafts are respectively accommodated. The torque generation mechanism is provided in the portion, and the torque pressure generated by the torque generation mechanism is varied in the tilt direction based on the rotation of the support arm member in the tilt direction. This is the pan / tilt mechanism of the viewfinder. For example, the torque pressure generated when lowering the viewfinder is increased, and the torque pressure generated when lifting the viewfinder is set small, so that the torque pressure generated on the first tilt rotation shafts in the tilt direction is made different. Can do. As an example of the torque generation mechanism, it is possible to vary the torque pressure depending on the tilt direction by providing a damper on one first tilt rotation shaft and providing a spring on the other first tilt rotation shaft. Of course, dampers having different torque pressures may be used for both first tilt rotation shafts supporting the viewfinder.

  In the first aspect of the present invention, in the pan / tilt mechanism for adjusting the display position of the viewfinder of the video camera, the pan / tilt mechanism has a pan rotation shaft provided on a fixed base mounted on the upper rear side of the video camera. A pan turntable that rotates in the pan direction as a center, a first tilt rotation shaft for turning the viewfinder up and down along an arcuate locus on the pan turntable, and a display surface of the viewfinder A support arm member provided with a second tilt rotation shaft for adjusting the tilt angle of the viewfinder, and the support arm member for adjusting the tilt angle of the display surface of the viewfinder by the second tilt rotation shaft. The pan / tilt mechanism has a tilt rotation restricting mechanism that makes the movable range in the tilt direction of the viewfinder constant regardless of the tilt position. After the viewfinder is set to an arbitrary tilt position by moving the supporting arm member up and down along an arcuate locus about the first tilt rotation axis. The tilt angle of the display surface of the viewfinder can be adjusted within a certain range with the second tilt rotation axis as the rotation axis, and the viewfinder display surface can be adjusted optimally without any discomfort at any tilt position. Can be adjusted to the position. Furthermore, since the viewfinder is disposed at a position close to the rear part of the video camera, there is an advantage that the operability when the camera operator operates the video camera is improved.

According to a second aspect of the present invention, the tilt rotation restricting mechanism is pivotally supported by a tilt rotation shaft provided in the vicinity of the first tilt rotation shaft, and a protrusion is provided at a tip portion thereof. A tilt angle regulating arm member that follows the movement of
A regulating member fixed to a side wall portion of the viewfinder, provided with an arcuate guide groove that is supported by the support arm and is engaged with the tilt angle regulating arm member;
2. The pan / tilt mechanism for a viewfinder according to claim 1, wherein the movable range in the tilt direction of the viewfinder is set according to the length of the guide groove. An angle restricting arm member is provided, and the tilt angle restricting arm member is engaged with an arcuate guide groove provided on the restricting member and is driven by the support arm member. There is an advantage that a certain range restricted by the guide groove can be moved and the tilt angle of the display surface of the viewfinder can be adjusted, and the operability of the video camera is improved.

  According to a third aspect of the present invention, the fixed base is provided with a slide mechanism that slides the viewfinder in the front-rear direction with respect to the video camera, and rotation of the viewfinder in the pan direction and front-rear movement by the slide mechanism. When the slide in the direction, the viewfinder includes a stopper member for restricting the range of rotation in the pan direction and the slidable range in the front-rear direction to prevent interference with surrounding members including the video camera. The pan / tilt mechanism of the viewfinder according to claim 1 or 2, wherein when the viewfinder is slid in the front-rear direction by the slide mechanism, the stopper member comes into contact with the rear part of the camera body or the fixed base, Advantages that the viewfinder can eliminate inadvertent contact with the camera body A. Furthermore, by providing the pan / tilt mechanism with a stopper member, there is an advantage that inadvertent interference can be prevented with the stopper member even when the model or structure of the video camera is different.

  According to a fourth aspect of the present invention, the stopper member is sandwiched between the tilt angle regulating arm members provided on both side walls of the viewfinder, and the stopper member adjusts the viewfinder to a predetermined tilt angle. 4. The pan / tilt mechanism for a viewfinder according to claim 3, wherein the pan / tilt mechanism of the viewfinder according to claim 3 restricts rotation of the pan turntable and the slide mechanism in contact with the fixed base. By providing it between the regulating arm members, the tilt angle regulating arm member is passive in rotation in the pan direction and in the tilt direction, and if the stopper member comes into contact with the camera body etc., the pan rotating table rotates and slides by the slide mechanism. It is possible to regulate the position and prevent the viewfinder from touching and damaging the camera body. There is an advantage that it is.

  According to a fifth aspect of the present invention, the pair of first tilt rotation shafts are respectively provided in bearing portions provided on the pan rotation table, and the pair of first tilt rotation shafts are housed respectively. The torque generation mechanism is provided in the portion, and the torque pressure generated by the torque generation mechanism is varied in the tilt direction based on the rotation of the support arm member in the tilt direction. The viewfinder pan / tilt mechanism allows the tilt angle to be set by generating an appropriate torque pressure using the torque generation mechanism when the viewfinder is moved downward. When moving it, it is possible to adjust it by slightly pushing up the viewfinder by attenuating the torque pressure by the torque generation mechanism. Rapid rise or fall of the viewfinder of the camera operator can be prevented, there is an advantage that operability is improved.

  Embodiments of a viewfinder pan / tilt mechanism according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention. The camera body is equipped with a viewfinder attached to the pan / tilt mechanism of this embodiment, and the viewfinder is parallel to the camera body and is at the highest position. It is a side view which shows the state set to (2). 2 is a rear perspective view of the present embodiment of FIG. 1, FIG. 3 is a rear perspective view showing only the pan / tilt mechanism, and A in the drawing is an exploded perspective view of the main part. FIG. 4 is a rear perspective view excluding the viewfinder in which the present embodiment is mounted on the camera body, and is a rear perspective view when the viewfinder is set to the lowest position. FIG. 5 is a top view in which the pan / tilt mechanism of the present embodiment is mounted on the camera body, and is a diagram showing a range in which the viewfinder can be panned by 90 ° right and left. 6A to 6D are side views showing the operation in the tilt direction of the present embodiment and the movable range. FIGS. 7A to 7C are side views showing the operation when the viewfinder in the present embodiment is set to the highest tilt position, and FIGS. 8A to 8C show the viewfinder at the lowest position. It is a side view which shows operation | movement at the time of setting to the tilt position.

  With reference to FIGS. 1-4, one Embodiment of the pan / tilt mechanism 20 of this invention is described. The pan / tilt mechanism 20 of the present embodiment is a mechanism that allows the camera operator to adjust the display position of the viewfinder 30 of the video camera 3 or television camera mounted on the camera mount device 1 to an optimum position. The tilt mechanism 20 includes a pan mechanism unit 20a and a tilt mechanism unit 20b. In the present embodiment, a fixed base 40 mounted at the upper rear of the camera mount device 1 or the camera body 3 of the video camera is provided, and the viewfinder 30 is moved in the pan direction (horizontal) around the pan rotation axis 41 on the fixed base 40. A pan rotation table 42 for rotating the viewfinder 30 in a vertical direction along an arcuate locus, and a pan rotation table 42 for rotating the viewfinder 30 in the vertical direction. Supporting arm members 50a and 50b provided with second tilt rotation shafts 60a and 60b for adjusting the tilt angle of the display surface of the viewfinder 30 are provided, and the viewfinder by the second tilt rotation shafts 60a and 60b is provided. When the tilt angle of the display surface 30 is adjusted, the position of the viewfinder 30 is adjusted regardless of the tilt positions of the supporting arm members 50a and 50b. Tilt rotation restriction mechanism 70 to set the movable range of bets direction constant is provided. The tilt rotation restricting mechanism 70 has a function of preventing the viewfinder 30 from coming into contact with and damaging the camera body 3 and its peripheral devices when the viewfinder 30 is adjusted to the optimum tilt position.

  The pan / tilt mechanism 20 is equipped by fitting a fixed base 40 to a pan / tilt mechanism mounting tool (for example, a hot shoe) provided at the upper rear of the camera mount device 1 or the camera body 3. . Further, the viewfinder 30 is provided with a grip portion 31 provided in a bridge shape on both side wall portions of the viewfinder 30, and the viewfinder 30 is moved in the vertical direction (tilt direction) and pan direction by grasping the grip portion 31 with a hand. Can be rotated.

  The pan / tilt mechanism 20 is mounted on a pan / tilt mechanism mounting tool in which a fixed base 40 of the pan mechanism portion 20a is provided in the upper rear part of the camera body. The fixed base 40 has, for example, a long plate shape. Guide portions 40 a that allow the pan / tilt mechanism 20 to slide in the front-rear direction of the camera body 3 are provided on both side walls in the longitudinal direction of the fixed base 40, and the pan / tilt mechanism 20 is attached to the camera base 3. A slide base 43 that is slidable in the front-rear direction is fitted into the guide portion 40 a to constitute a slide mechanism of the pan / tilt mechanism 20. A pan rotating shaft 41 passes through the sliding base 43, and a pan rotating base 42 is provided so as to rotate in the pan direction around the pan rotating shaft 41, and pan rotation is performed so as to sandwich the sliding base 43. A table 42 and a fixed table 40 are provided. The pan rotation shaft 41 is provided with a lock lever (lock member) 44, and a lock mechanism for fixing the pan rotation table 42 to the fixed table 40 by the lock lever 44 is provided.

  In the tilt mechanism portion 20b, support arm portions 42a and 42b projecting left and right rearward (rear side of the camera body) are respectively provided on the pan turntable 42, and a first tilt rotation shaft 45a is provided at the tip of the support arm portion 42a. A bearing portion 42c is provided for pivotally storing the first tilt rotation shaft 45b, and a support arm member 50a is provided at the distal end of the support arm portion 42b. , 50b are pivotally supported by the first tilt rotation shafts 45a, 45b, project rearward from the camera body 3, etc., extend parallel to the side wall surface of the viewfinder 30, and support arm members 50a, 50b, Each other end of 50b is pivotally supported on the side wall portion of the viewfinder 30 by second tilt rotation shafts 60a and 60b. The tilt mechanism 20b has a function of moving the viewfinder 30 in the vertical direction (tilt direction) along an arcuate locus by the first tilt rotation shafts 45a and 45b. Further, the second tilt rotation shafts 60a and 60b at the other ends of the supporting arm members 50a and 50b support the viewfinder 30 so that the viewfinder 30 can rotate freely, and adjust the tilt angle of the display surface of the viewfinder 30. Have. The pan / tilt mechanism 20 is provided with a tilt rotation restricting mechanism 70 for making the tilt angle (tilt angle) of the display surface of the viewfinder 30 constant by following the supporting arm members 50a and 50b.

  Further, when the pan / tilt mechanism 20 is slid by the slide mechanism to adjust the tilt angle by the support arm members 50a and 50b, the slide operation at the tilt position where the viewfinder 30 is lowered most is not in contact with the camera body 3 or the like. In order to prevent prepared interference, a stopper member 76 is provided between tilt angle regulating arm members 70a and 70b, which will be described later. When the pan / tilt mechanism 20 is slid and the camera body 3 comes close, the stopper member 76 is brought into contact with the fixed base 40 or the rear part of the camera body 3 to prevent the viewfinder 30 from being damaged. The slidable range in the front-rear direction is restricted at any pan position in the direction. Further, the stopper member 76 has a function of maintaining the mechanical strength of the pan / tilt mechanism 20.

  Further, the first tilt rotation shafts 45a and 45b are provided with a torque generating mechanism, which is set and operated so that a large torque pressure is generated when the viewfinder 30 is lowered and the torque pressure is decreased when the viewfinder 30 is lifted upward. Good quality. For example, a damper is provided on the first tilt rotation shaft 45a, and a spring is provided on the first tilt rotation shaft 45b. The damper provided on the first tilt rotation shaft 45a generates torque pressure when the viewfinder 30 is pushed downward so that the viewfinder 30 does not drop rapidly, and the viewfinder 30 is rotated upward. The torque generated by the damper is attenuated, and when the spring provided on the first tilt rotation shaft 45b rotates the viewfinder 30 upward, an appropriate torque pressure is generated, and the viewfinder 30 As a result, the tilt angle of the viewfinder 30 can be adjusted smoothly. Thus, the torque pressure generated in the first tilt rotation shafts 45a and 45b is made different depending on whether the viewfinder 30 is moved upward or downward. As an example of the torque generating mechanism, it has been shown that a damper is used for the first tilt rotation shaft 45a and a spring is used for the first tilt rotation shaft 45b. However, if the torque pressure can be made different depending on the vertical tilt direction. Any torque generating mechanism may be used. For example, dampers having different torque pressures may be used for the left and right first tilt rotation shafts 45a and 45b, or both may be springs.

  Further, the support arm members 50a and 50b have a U-shaped appearance on the side surface, and the first tilt rotation shaft 45a and the first tilt rotation shafts 45a and 50b are bent in the same bending direction from the bent U-shaped support arm members 50a and 50b. Protrusions 51a and 51b projecting outward from the respective shaft centers of 45b are provided. The leading ends of the protrusions 51a and 51b are firmly connected by the support shaft 52, and the pan / tilt mechanism 20 is distorted when the supporting arm members 50a and 50b rotate the viewfinder 30 in the pan direction and the tilt direction. It does not occur. In addition, a holder (not shown) for fixing the wiring cord of the viewfinder 30 is provided on either one of the supporting arm members 50a and 50b. The wiring cord is fixed to the holder and the viewfinder 30 is moved in the pan direction and the tilt direction. When rotated, the wiring cord prevents the camera body 3 and the pan / tilt mechanism 20 itself from being entangled.

  The tilt rotation restricting mechanism 70 has a function of restricting the range in which the viewfinder 30 can be rotated in order to make the tilt angle of the viewfinder 30 constant, and the tilt angle restricting arm members 70 a and 70 b and the viewfinder 30 One end of the tilt angle regulating arm member 70a is pivotally supported by the tilt rotation shaft 71a in the vicinity of the bearing portion 42c provided with the first tilt rotation shaft 45a. In addition, a protrusion 73a protruding in the direction of the side wall surface of the viewfinder 30 is provided on the inner surface side of the tip portion, and similarly, one end of the tilt angle regulating arm member 70b is provided with a first tilt rotation shaft 45b. Near the inside of the bearing portion 42d, it is pivotally supported by a tilt rotation shaft 71b. Projections 73b which are provided. The restricting members 72a and 72b are fixed to the both side walls of the viewfinder 30, and the second tilt rotation shafts 60a and 60b provided on the supporting arm members 50a and 50b are respectively provided with the bearing portions 75a and 75b of the restricting members 72a and 72b. The guide members 74a and 72b are respectively provided with arcuate guide grooves 74a and 74b that are respectively pivotally supported and engage with the projections 73a and 73b of the tilt angle regulating arm members 70a and 70b, respectively.

  The guide grooves 74a and 74b are arc-shaped grooves centered on the axis centers of the tilt rotation shafts 71a and 71b. Depending on the length of the guide grooves 74a and 74b, the tilt angle (tilt angle) of the display surface of the viewfinder 3 is determined. That is, the movable range in the tilt direction of the display surface of the viewfinder 3 can be set. For example, if the arcuate guide grooves 74a and 74b are set to 30 ° to 45 °, the viewfinder 30 is set to a horizontal position (the display surface of the viewfinder 30 is perpendicular to the incident optical axis of the camera), and the horizontal The tilt angle that defines the movable range in the vertical direction from the position, that is, the tilt angle of the display surface of the viewfinder 30 can be rotated in the range of 30 ° to 45 °. Moreover, it is possible to set a desired movable range (tilt angle) by arbitrarily setting the lengths of the arc-shaped guide grooves 74a and 74b. If the tilt angle that sets the movable range in the tilt direction exceeds 45 °, the viewfinder may interfere with the camera body depending on the camera model, etc., and the movable range can be set arbitrarily according to the camera model, etc. To do.

  Next, a method for adjusting the tilt position of the viewfinder according to the present embodiment will be described. In the present embodiment, as shown in FIG. 5, the pan turntable 42 can rotate 90 ° in the left-right horizontal direction from the front-rear direction center line C of the camera body 3 around the pan rotation shaft 41, and 90 in the left-right horizontal direction. Any pan position can be set within the range of °. First, the pan mechanism portion 20a is provided with a slide mechanism in which a slide base 43 is slidably provided on the fixed base 40, and the camera operator can use the pan / tilt mechanism 20 to which the viewfinder 30 is attached. Are set to a predetermined slide position and set to an arbitrary pan position, and then the lock lever 44 is tightened to fix the desired slide position and pan position. Next, after fixing the slide position and the pan position, the viewfinder 30 is set to a desired tilt angle (first tilt angle), the tilt angle (second tilt angle) of the display surface of the viewfinder 30 is adjusted, and the view The display surface of the finder 30 is set to the optimum tilt position. In the present embodiment, the pan turntable 40 may be fixed after the slide position is fixed.

In the present embodiment, after setting the first tilt angle, the tilt angle (second tilt angle) of the display screen of the viewfinder 30 is set, and the first tilt angle is shown in FIGS. (d), the can be set arbitrarily within a range of tilt angles (a first tilt angle) _{T 1} by tilt position Ta to Tb, and FIG. 7 (a) ~ (b) and FIG. 8 (a ) as shown in ~ (b), can be adjusted within a range the inclination angle of the display surface of the viewfinder 30 (second tilt angle) of the first tilt angle T _1. FIGS. 6A to 6D are views in which the viewfinder 30 and the camera body 3 are omitted, and FIG. 6A is the adjustment of the first tilt angle, and the viewfinder 30 is set to the highest position. The viewfinder 30 is gradually lowered in this order (b) to (d) in the same tilt position Ta, and (d) shows the figure set at the most lowered tilt position Tb. Yes. The camera operator, for example, grips and lowers or raises the grip 31 of the viewfinder 30 at the highest position (FIG. 6A), and tilts as shown in FIGS. 6A to 6D. angle can be set viewfinder 30 in any tilt position of the (first tilt angle) T _1.

When the camera operator grasps the grip portion 31 and operates to lower the viewfinder 30, the support arm member 50a (50b) at the tilt position in FIG. 6A is moved to the first tilt rotation shaft 45a (45b). ) About the axis, and the arm member 70a (70b) for tilt angle regulation moves following the supporting arm member 50a (50b). The tilt angle regulating arm member 70a (70b) rotates about the tilt rotation shaft 71a (71b) as an axis, and a protrusion 73a (73b) provided at the tip thereof is provided on the regulating member 70a (70b). The arm member 70a (70b) for tilt angle regulation is slidably engaged with the arcuate guide groove 74a (74b), and moves according to the arcuate guide groove 74a (74b). The guide groove 74a (74b) is an arc-shaped groove having the axis center of the second tilt rotation shaft 60a (60b). In FIG. 6A, the protrusion 73a (73b) is located in front of the guide groove 74a (74b). The tilt position at this time is Ta. 6B, the projection 73a (73b) slightly moves to the rear position, and in FIG. 6D, the tilt position when the projection 73a (73b) is at the rearmost position is Tb. It is. By protrusion 73a (73b) is restricted by the guide groove 74a (74b), that the tilt angle restriction-arm member 70a (70b) is to be regulated by the guide groove 74a (74b) is set to any tilt angle _{T 1} Can do. That is, the movable range by the first tilt angle is set by the guide groove 74a (74b). When an arbitrary tilt angle is set by the support arm member 50a (50b), the lock lever (lock member) 21 provided on the first tilt rotation shaft 45b is tightened and fixed. Thus, the first tilt angle can be set by the length of the arc of the guide groove 74a (74b) provided in the restricting member 70a (70b), and the view angle can be determined by the length of the guide groove 74a (74b). A range (first tilt angle) in which the finder 30 can be rotated in the tilt direction can be set. When the projection 73a (73b) is positioned at the center of the guide groove 74a (74b) at any tilt position of the first tilt angle, the display surface of the viewfinder 30 is relative to the optical axis incident on the video camera. The viewfinder 30 is set almost horizontally at this time.

After the tilt angle regulating arm member 70a (70b) is fixed by the lock lever 21 and set to an arbitrary first tilt angle, the tilt angle of the display surface of the viewfinder 30 (second tilt angle) is operated by operating the grip portion 31. Is adjusted to a desired tilt angle. Referring to FIGS. 7A to 7C and FIGS. 8A to 8C, FIG. 7A shows a state in which the first tilt angle is set to the highest position horizontally, and a protrusion. 73a (73b) is located at the center in the arc-shaped guide groove 74a (74b). FIG. 8A shows a state in which the viewfinder 30 is horizontally set at the lowest position, and is located at the center in the arc-shaped guide groove 74a (74b). Figure 7 (b) the display surface of the viewfinder 30 from the horizontal state, shows a state of being rotated in the tilt angle _{T 2} above, the protrusion 73a (73b) the rear (camera body side of the guide groove 74a (74b) ). Further, FIG. 7 (c) the display surface of the viewfinder 30 set horizontally, shows a state of being rotated in the tilt angle _{T 3} below, protrusions 73a (73b) is a guide groove 74a, the front of the 74b (display Located on the surface side). In FIG. 8 (a), projections 73a (73b) is located centrally within the circular arc shaped guide groove 74a (74b), FIG. 8 (b) a view finder 30, which is set horizontally to the tilt angle _{T 2} above The projection 73a (73b) is positioned rearward (camera body side) in the guide groove 74a (74b), and FIG. 8 (c) shows the viewfinder 30 set horizontally with a tilt angle T _3. The projection 73a (73b) is positioned in front of the guide grooves 74a and 74b (on the display surface side). As described above, the tilt angle (second tilt angle) of the display surface of the viewfinder 30 can be arbitrarily set within the range of the tilt angles T ₂ and T ₃ , and the lock is made after adjusting the arbitrary second tilt angle. The lever (lock member) 22 is tightened to fix the second tilt angle. Note that the tilt angles T ₂ and T ₃ are equal to any tilt angle of the first tilt angle T ₁ .

  As described above, the support arm member 50a (50b) is driven by the tilt angle regulating arm member 70a (70b) when the arbitrary first tilt angle is set, and is then set to the first tilt angle. Is fixed to restrict the rotation of the support arm member 50a (50b), and the tilt angle of the viewfinder 30 is adjusted to set the second tilt angle. At that time, the tilt angle regulating arm member 70a (70b) is driven in accordance with the variation of the tilt angle. Regardless of the tilt position of the first tilt angle, the support arm member 50a (50b) can make the second tilt angle constant by the length of the guide grooves 74a and 74b.

  As described above, in the present embodiment, in the pan / tilt mechanism for adjusting the display position of the viewfinder of the video camera or the TV camera, the pan / tilt mechanism is provided on the fixed base mounted on the upper rear side of the video camera. A pan turntable that rotates in the pan direction around the pan rotation axis, and a first tilt rotation axis and a viewfinder display for turning the viewfinder up and down along an arcuate path on the pan turntable A support arm member provided with a second tilt rotation axis for adjusting the tilt angle of the surface, and when the tilt angle of the display surface of the viewfinder is adjusted by the second tilt rotation shaft, Regardless of the tilt position, the pan / tilt mechanism has a tilt rotation restricting mechanism that makes the movable range in the tilt direction of the viewfinder constant. A preparative mechanism, greater freedom in the regulation of the display position of the viewfinder than those of the conventional example, can be constructed an easy-to-use camera system.

  In addition, it has a slide mechanism that can slide the viewfinder in the front-rear direction (front-rear direction along the incident optical axis direction of the video camera) with respect to the video camera, and the viewfinder can be moved to any desired tilt angle by the first and second tilt angles. Can be set to The viewfinder can be rotated in the pan direction at any tilt angle that is raised or lowered about the first tilt rotation axis. When setting the pan position and tilt angle, the viewfinder is A stopper member for preventing interference with other peripheral devices is provided, and safety is improved. Further, the tilt angle of the display surface of the viewfinder can be adjusted around the second tilt rotation axis. Since the range is constant, the degree of freedom in adjusting the display position of the viewfinder is increased compared to the conventional example, and an easy-to-use camera system can be constructed.

  In addition, support arm members that support the viewfinder are arranged on both side walls of the viewfinder and incorporated in a reverse shape, so that the viewfinder can be placed further downward and a large viewfinder is attached However, it does not protrude extremely outward from the video camera compared to the conventional case, and even if a large viewfinder is installed, it can be mounted compactly, and the rear part of the video camera is located near the viewfinder. Therefore, it is possible to construct a camera system that is easy to use and is easier to operate than the conventional example.

  As an application example of the present invention, a pan / tilt mechanism equipped with a viewfinder is mounted on a video camera or a camera mount device, etc., and the degree of freedom in setting the rotation and tilt angle in the pan direction is high, When setting the tilt angle, it can be used as a pan / tilt mechanism that is easy to use and highly safe so that the viewfinder does not interfere with the camera body or peripheral devices.

1 is a side view showing an embodiment of the present invention, in which a viewfinder is mounted on a camera body and set at the highest position in parallel with the camera body. It is a back perspective view of this embodiment. 1 is a rear perspective view showing a pan / tilt mechanism of the present embodiment, in which A is an exploded perspective view of a main part. It is the back perspective view which set the viewfinder in this embodiment to the lowest position. FIG. 5 is a top view showing that the camera body is equipped with the pan / tilt mechanism of the present embodiment and the viewfinder can be rotated 90 ° in the left-right pan direction. (A)-(d) is a side view which shows the operation | movement of the tilt direction of this embodiment. (A)-(c) is a side view which shows the tilt operation | movement at the time of setting the tilt position of the viewfinder with which this embodiment was mounted | worn to the highest position. (A)-(c) is a side view which shows the tilt operation | movement at the time of setting the tilt position of the viewfinder with which this embodiment was mounted | worn to the lowest position. It is a perspective view of the television camera carrying the conventional viewfinder. It is a perspective view which shows the example which mounted the pan / tilt mechanism equipped with the conventional viewfinder in the camera mount apparatus.

Explanation of symbols

20 Pan / tilt mechanism 20a Pan mechanism unit 20b Tilt mechanism unit 21, 22 Lock lever (lock member)
DESCRIPTION OF SYMBOLS 30 Viewfinder 31 Grasping part 40 Fixing base 40a Guide part 41 Pan rotating shaft 42 Pan rotating base 42a, 42b Support arm part 42c, 42d Bearing part 43 Sliding base 44 Lock lever (lock member)
45a, 45b First tilt rotation shafts 50a, 50b Support arm members 51a, 51b Protruding portions 52 Support shafts 60a, 60b Second tilt rotation shafts 70 Tilt rotation restriction mechanisms 70a, 70b Tilt angle restriction arm members 71a, 71b Tilt rotation shaft 72a, 72b Restriction member 73a, 73b Protrusion 74a, 74b Guide groove 75a, 75b Bearing portion 76 Stopper member

Claims (5)

  In the pan / tilt mechanism for adjusting the display position of the viewfinder of the video camera, the pan / tilt mechanism rotates in the pan direction around a pan rotation axis provided on a fixed base mounted on the upper rear side of the video camera. A pan rotation table, a first rotation axis for rotating the viewfinder vertically along an arcuate locus on the pan rotation table, and a tilt angle of the display surface of the viewfinder are adjusted. And a support arm member provided with two tilt rotation axes, and when adjusting the tilt angle of the display surface of the viewfinder by the second tilt rotation axis, regardless of the tilt position of the support arm member, The pan / tilt mechanism includes a tilt rotation restricting mechanism that makes a movable range in the tilt direction of the viewfinder constant. Pan-tilt mechanism of the view finder. The tilt rotation restriction mechanism is supported by a tilt rotation shaft provided in the vicinity of the first tilt rotation shaft, and a protrusion is provided at a tip portion thereof, for tilt angle restriction driven by the movement of the support arm member. An arm member;
A regulating member fixed to a side wall of the viewfinder, and provided with an arcuate guide groove that is engaged with the tilt angle regulating arm member while the supporting arm is pivotally supported;
2. The viewfinder pan / tilt mechanism according to claim 1, wherein a movable range in a tilt direction of the viewfinder is set according to a length of the guide groove.   The fixed base is provided with a slide mechanism that slides the viewfinder in the front-rear direction with respect to the video camera. When the viewfinder rotates in the pan direction and slides in the front-rear direction by the slide mechanism, the viewfinder is provided. 3. A stopper member for restricting rotation in the pan direction and a slidable range in the front-rear direction for preventing interference with surrounding members including the video camera. 4. Pan / tilt mechanism of the viewfinder.   The stopper member is sandwiched between the tilt angle regulating arm members provided on both side walls of the viewfinder, and the stopper member abuts on the fixed base when the viewfinder is adjusted to a predetermined tilt angle. 4. The viewfinder pan / tilt mechanism according to claim 3, wherein the pan rotation table and the slide mechanism are regulated. A pair of the first tilt rotation shafts are respectively provided in bearing portions provided on the pan rotation table, and a torque generation mechanism is provided in the bearing portions in which the pair of first tilt rotation shafts are respectively stored. 2. The pan / tilt mechanism for a viewfinder according to claim 1, wherein the torque pressure generated by the torque generation mechanism is varied in the tilt direction based on rotation of the support arm member in the tilt direction.
Inder pan / tilt mechanism.

Images