JP4029031B2 - Remote control camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a remote operation camera that is particularly suitable for a surveillance camera, in which the direction of the camera can be freely changed by a remote operation by rotating horizontally and vertically.
[0002]
[Prior art]
In general, as a turning device for turning a mounting base of a monitoring camera, a rotating shaft of a robot arm, etc., there is one as disclosed in Japanese Patent Laid-Open No. 10-90758, for example. This prior art exemplifies a state in which the swivel device is assembled to a monitoring camera. A support rod for hanging the monitoring camera is connected to a motor via a reduction gear, and the support rod is driven by the driving force of the motor. Is configured to rotate.
[0003]
By the way, at the time of sudden turning or sudden reversal, gear meshing surfaces interfere with each other due to gear backlash, processing error, and assembly error, and noise and vibration are generated. In particular, when a pulse motor is employed as the motor, rotation fluctuations occur every pulse, so that noise and vibration are further manifested.
[0004]
For this reason, Japanese Patent Application Laid-Open No. 2000-55142 discloses a swinging member connected to a turntable, a fixing ring disposed on the outer periphery of the turntable and having an inner gear, a motor fixed to the swinging member, An intermediate gear pivotally supported by the swing member, a drive gear that is pivotally attached to the motor and meshed with the intermediate gear, and the swing member is pressed toward the inner gear through the drive gear and the intermediate gear. There is disclosed a swivel device comprising a pressing member for biasing.
[0005]
According to this apparatus, when the motor fixed to the swing member connected to the turntable rotates, the intermediate gear that is pivotally supported by the swing member is connected to the drive gear that is pivotally attached to the motor. Thus, the inner gear provided on the inner periphery of the fixing ring tries to rotate, and the turntable rotates by the reaction force. At this time, since the pressing member urges the swinging member in the inner gear direction via the drive gear and the intermediate gear, gear backlash, machining error, and assembly error are absorbed, and noise and vibration are reduced. Can be achieved.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-90758 [Patent Document 2]
JP-A-2000-55142 [0007]
[Problems to be solved by the invention]
However, in the apparatus disclosed in Japanese Patent Laid-Open No. 12-55142, as shown in claim 2, a motor is mounted on the first lever, an intermediate gear is pivotally supported on the second lever, and the first lever is mounted. By pressing and urging the second lever direction with the pressing member, the intermediate gear is pressed and urged to the inner gear, so the number of parts increases, and it takes time and effort to assemble the device, making it difficult to make the device compact. There was a problem.
[0008]
Accordingly, an object of the present invention is to provide a camera for remote control which requires only a small number of parts of the apparatus, can be easily assembled, and is suitable for downsizing.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a remote control camera according to the present invention includes a base having an internal gear on the inner periphery, a rotary base rotatably mounted on the base, and a stand mounted on the rotary base. And a camera body rotatably attached to the support frame via a rotation axis substantially orthogonal to the rotation center of the turntable, and the turntable is pivotally supported at one place on the turntable. A support plate that is swingably supported and has a hole or slit formed in the center, a first motor fixed to one side of the hole or slit of the support plate, and the first motor. The drive gear that is rotated by the shaft, and is rotatably supported in the center of the other side of the hole or slit of the support plate, and is engaged with the drive gear by the elastic force of the hole or slit. The intermediate gear and the support plate rotate And resiliently urged to rotate in a predetermined direction, and having a resilient biasing means for meshing with said intermediate gear to the internal gear of the turntable relative.
[0010]
According to the above invention, the first motor and the intermediate gear are installed on the support plate with the punch hole or slit interposed therebetween, and the drive gear of the first motor and the intermediate gear are pressed against each other by the elastic force of the punch hole or slit. In this state, since the intermediate gear further meshes with the internal gear of the turntable, the rotation of the drive gear causes the intermediate gear to rotate along the internal gear while meshing with the internal gear, thereby rotating. The base rotates with the camera body. At this time, since each of the drive gear, the intermediate gear, and the internal gear is elastically pressed, backlash is unlikely to occur, and rattling noise is reduced. In addition, by installing the first motor and the intermediate gear in advance on the support plate and attaching the support plate to the turntable, the first motor, the drive gear, and the intermediate gear can be attached to the turntable. Assembling work becomes easy and the number of parts can be reduced.
[0011]
In the camera for remote control according to the present invention, the rotary table is provided with a second motor, and a drive shaft of the second motor is elastically movable at a predetermined distance in the axial direction while being engaged in the rotational direction. The camera body is connected to a worm gear through a coupling made of a material, and the camera body rotates integrally with the camera body, and a vertical rotation gear that meshes with the worm gear is mounted on the worm gear. It is preferable that the drive shaft is biased by an elastic means and is elastically pressed against the vertical rotation gear.
[0012]
According to the above aspect, since the drive shaft of the second motor and the worm gear are connected via the coupling made of an elastic material, the tolerance of assembly accuracy is increased and the generation of noise is reduced by vibration absorption. be able to. Further, since the worm gear is urged in the direction of the drive shaft by the elastic means, the meshing between the worm gear and the up-and-down rotation gear can be kept in close contact with each other, and the backlash and backlash sound can be reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a perspective view of a remote control camera according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the remote control camera, FIG. 3 is an exploded perspective view of a horizontal rotation mechanism of the remote control camera, and FIG. Is a plan sectional view of the horizontal rotation mechanism, FIG. 5 is a side view showing a vertical drive mechanism of the remote control camera, and FIG. 6 is a perspective view showing a connection structure between a drive shaft of a second motor and a worm gear in the vertical drive mechanism. FIG.
[0014]
As shown in FIG. 1, the remote control camera 10 is particularly suitable for a surveillance camera, and a base 11 fixed to an indoor ceiling or the like, and the base 11 can be horizontally rotated and moved up and down. And a cover 13 that covers the camera body 12. The cover 13 rotates horizontally together with the camera body 12, and a window 15 made of a transparent material is attached along the direction in which the lens 14 is directed as the camera body 12 moves up and down.
[0015]
Referring also to FIG. 2, the base 11 is composed of a large diameter cylindrical portion 11a and a small diameter cylindrical portion 11b. In the large-diameter cylindrical portion 11a, a plurality of wiring boards 21 on which electronic components constituting a control circuit are mounted are arranged vertically with a predetermined interval. The small diameter cylindrical portion 11 b is fixed to the large diameter cylindrical portion 11 a by a screw 22.
[0016]
As shown in FIG. 3, an internal gear 23 is fixed by a screw 24 on the inner periphery of the bottom of the small diameter cylindrical portion 11 b. Further, a rotating substrate 31 constituting a rotating table 30 described later is fixed to a rotating shaft 33 arranged in the small diameter cylindrical portion 11b through a screw 32. The rotary shaft 33 is rotatably supported through a bearing (not shown) at the center of the bottom of the small diameter cylindrical portion 11b. Therefore, the rotary substrate 31 can be horizontally rotated integrally with the rotary shaft 33.
[0017]
Three cylindrical columns 34 are fixed to the rotating substrate 31 via screws 35. In addition, an end portion of the resin support plate 40 is sandwiched between one of the columns 34a and the rotating substrate 31, and a screw 35 is inserted through a hole 41 formed in the end portion. Screwed. The support column 34a incorporates a rotating shaft held by a bearing (not shown), and the support plate 40 is fixed to the rotating shaft and supported so as to be swingable.
[0018]
Referring also to FIG. 4, the support plate 40 is formed with an elongated hole 42. An intermediate gear 43 is rotatably supported at the center of one side of the punched hole 42 via a support shaft (not shown). A first servo motor 44 is fixed to the other side of the hole 42 with a screw (not shown), and a drive shaft 45 projects through the hole 42 to the opposite side of the support plate (upward in FIG. 3). . A drive gear 46 is attached to the drive shaft 45. The drive gear 46 is engaged with the intermediate gear 43 in a state of being pressed by causing the punching hole 42 to be opened to some extent and applying the elastic force of the support plate 40.
[0019]
Further, the support plate 40 is supported so as to be able to swing as described above by the screw 35 screwed to the support post 34, but the other end portion is supported by a spring 47 interposed between the rotary substrate 31. It is urged outward. As a result, as shown in FIG. 4 in particular, the intermediate gear 43 is brought into pressure contact with the internal gear 23 by the urging force of the spring 47 and meshed therewith.
[0020]
As described above, according to the present invention, the drive gear 46 attached to the drive shaft of the first servo motor 44 and the intermediate gear 43 are attached to the support plate 40 in a state where both are pressed and engaged. It is possible to construct a horizontal rotation mechanism simply by attaching the support plate 40 to the rotary substrate 31 and engaging the intermediate gear 43 with the internal gear 23, thereby reducing the number of parts and assembling the apparatus. Workability is improved, and the meshing of the gears is ensured, resulting in fewer failures.
[0021]
The support plate 40 preferably has the above-described hole 42 but may have a slit cut from a part of the outer periphery. In addition, a resin-made one is preferable in order to elastically press the drive gear 46 and the intermediate gear 43, but a thin metal plate or the like can be used.
[0022]
Reference numeral 49 shown in FIG. 4 is a limit switch that regulates the horizontal rotation angle in order to prevent the wiring from being twisted, although details are omitted.
[0023]
The upper plate 50 is similarly fixed to the column 34 with screws, and the rotary substrate 31, the upper plate 50, and the column 34 that connects them constitute the turntable 30 of the present invention.
[0024]
One end of the upper plate 50 is bent in an L shape when viewed from the long side direction, and the bent portion is screwed to the upper plate 50 and is erected vertically and parallel to the upper plate 50. A pair of support frames 51, 51 are attached. The camera body 12 is supported by the support frames 51 and 51 through the support shafts 52a and 52b so as to be movable up and down (tilt).
[0025]
5 and 6 together, a worm wheel 53 is attached to one of the support shafts 52a. A second servo motor 54 is attached to the surface of the upper plate 50 on the rotating substrate 31 side. The drive shaft 55 of the second servo motor 54 protrudes from the surface on the opposite side of the rotating substrate 31.
[0026]
The drive shaft 55 is formed with a hole 55a, and a sleeve 56 is mounted on the outer periphery thereof. The connecting pin 57 is inserted through the hole 56 a of the sleeve 56 and the hole 55 a of the driving shaft 55, thereby connecting the driving shaft 55 and the sleeve 56. At the tip of the sleeve 56, a convex portion 56b protruding in a rib shape is formed.
[0027]
On the other hand, a worm shaft 59 having a worm 58 meshing with the worm hole 53 is disposed in a direction perpendicular to the support shaft 52 a of the camera body 12 via a bracket 60 erected from the upper plate 50. It is supported.
[0028]
A hole 59a is formed at the base end of the worm shaft 59, and a pin 62 is inserted into the hole 59a. The sleeve 56 and the worm shaft 59 are connected via a coupling 63 made of an elastic material such as synthetic rubber.
[0029]
The coupling 63 has grooves 63a and 63b formed in directions intersecting with each other at both ends of the cylindrical body as a whole, and the convex portion 56b of the sleeve 56 is inserted into one groove 63a, and the other The pin 52 inserted into the worm shaft 59 is inserted into the groove 63b.
[0030]
As a result, the sleeve 56 and the worm shaft 59 are coupled so as to rotate integrally with each other while allowing some movement in the axial direction within a range that does not protrude from the depth of the grooves 63a and 63b of the coupling 63. Has been.
[0031]
Further, by using such an elastic coupling 63, even if a slight positional deviation occurs between the drive shaft 55 and the worm shaft 59, the assembly error can be absorbed and the assembly accuracy can be absorbed. Tolerance can be increased.
[0032]
Next, the operation of the remote operation camera 10 will be described.
In the remote operation camera 10, when a drive signal is input to a control circuit mounted on the wiring board 21 via a LAN or the Internet, for example, by a personal computer or a mobile phone, the first servo motor 44 and the second servo motor 44 are connected. The servo motor 54 is rotated so that the camera body 12 can be directed in a desired free direction.
[0033]
That is, when the first servo motor 44 rotates, the intermediate gear 43 that meshes with the internal gear 23 fixed to the small diameter cylindrical portion 11b of the base 11 rotates via the drive gear 46, and the intermediate gear 43 It moves in the circumferential direction of the internal gear 23 by the number of gears proportional to the rotation angle. As a result, the rotary substrate 31 also rotates integrally through the support plate 40 with the intermediate gear 43 mounted thereon, and the upper plate 50 connected through the support column 34 also rotates together. As a result, the camera body 12 can be rotated in the horizontal direction.
[0034]
When the second servo motor 54 is rotated, the worm 58 is rotated through the sleeve 56, the coupling 63 and the worm shaft 59, and the worm wheel 53 and the support shaft 52a meshing with the worm 58 are rotated. 12 can be rotated in the vertical direction to perform a tilting operation. Thus, by combining the horizontal rotation and the vertical rotation, the lens 14 of the camera body 12 can be directed in any arbitrary direction.
[0035]
In the present invention, as described above, the drive gear 46 attached to the drive shaft of the first servomotor 44 and the intermediate gear 43 are attached to the support plate 40, and the hole 42 of the support plate 40 is widened. The two elastic members are brought into pressure contact with each other, and in this state, the support plate 40 is urged by the spring 47 to press the intermediate gear 43 against the internal gear 23. Therefore, backlash between these gears is caused. Can be reduced, and vibration and noise caused by rotation can be reduced.
[0036]
Similarly, since the worm 58 rotated by the second servomotor 54 is pressed against the worm wheel 53 by the spring 61, the backlash between the two gears is reduced, and the coupling 63 made of an elastic material vibrates. Since it absorbs, vibration and noise due to rotation can be reduced.
[0037]
【The invention's effect】
As described above, according to the present invention, the first motor and the intermediate gear are installed on the support plate with the punched hole or slit interposed therebetween, and the driving gear of the first motor is Since the intermediate gear is in pressure contact with the intermediate gear, and the intermediate gear further meshes with the internal gear of the turntable, the intermediate gear meshes with the internal gear by rotation of the drive gear, and along the internal gear. Rotate, thereby rotating the turntable with the camera body. At this time, since each of the drive gear, the intermediate gear, and the internal gear is elastically pressed, backlash is unlikely to occur, and rattling noise is reduced. In addition, by installing the first motor and the intermediate gear in advance on the support plate and attaching the support plate to the turntable, the first motor, the drive gear, and the intermediate gear can be attached to the turntable. Assembling work becomes easy and the number of parts can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a remote control camera according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the remote control camera.
FIG. 3 is an exploded perspective view of a horizontal rotation mechanism of the remote operation camera.
FIG. 4 is a plan sectional view of the horizontal rotation mechanism.
FIG. 5 is a side view showing a vertical drive mechanism of the remote operation camera.
FIG. 6 is a perspective view showing a connection structure between a drive shaft of a second motor and a worm gear in the vertical drive mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Remote operation camera 11 Base 11a Large diameter cylindrical part 11b Small diameter cylindrical part 12 Camera main body 13 Cover 15 Window 21 Wiring board 23 Internal gear 30 Rotating base 31 Rotating base 33 Rotating shaft 34 Strut 40 Support plate 42 Punch hole 43 Middle Gear 44 First servo motor 45 Drive shaft 46 Drive gear 47 Spring 50 Support frame 53 Worm wheel 54 Second servo motor 55 Drive shaft 56 Sleeve 58 Worm 59 Warm shaft 60 Bracket 63 Coupling

Claims (2)

A base having an internal gear on the inner periphery, a turntable rotatably mounted on the base, and a support frame erected on the turntable are substantially orthogonal to the rotation center of the turntable. And a camera body rotatably mounted via a rotating shaft. The rotating table is pivotally supported at one position by the rotating table and has a hole or slit in the center. The formed support plate, a first motor fixed to one side of the hole or slit of the support plate, a driving gear rotated by the first motor, and the hole or slit of the support plate An intermediate gear that is rotatably supported at the center of the other side and meshes in a state of being pressed against the drive gear by the elastic force of the punch hole or slit, and the support plate with respect to the turntable. Elastically biased to rotate in the direction, Remote control camera; and a resilient biasing means for meshing between gears in said gear of said turntable.   A second motor is installed on the turntable, and a drive shaft of the second motor is connected to the worm gear via a coupling made of an elastic material that is movable in the axial direction by a predetermined distance while being engaged in the rotational direction. The camera body is mounted with a vertical rotation gear that rotates integrally with the camera body and meshes with the worm gear. The worm gear is attached to the drive shaft by elastic means. The remote control camera according to claim 1, wherein the remote operation camera is elastically pressed against the vertical rotation gear.

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