JP3120156B2 - TV door phone cord - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television door phone slave unit mounted on a wall such as a gate or entrance of a house, and more particularly, to an improved mechanism for adjusting a tilt angle of a monitor camera.

[0002]

2. Description of the Related Art In general, many monitor cameras provided in this type of TV door phone handset have a fixed orientation.
Some models can be changed direction remotely from indoors,
For example, it is disclosed in JP-A-62-38683. In this angle adjustment mechanism of a monitor camera capable of changing the direction, an intermediate frame is supported on a fixed frame by a motor so as to be tiltable left and right, for example, and a movable frame on which the monitor camera is mounted is supported by a motor and tiltable vertically, for example. The monitor camera is corrected in a desired direction by arbitrarily operating the motor by a cross operation of a lever switch provided on the parent device side in the room.

[0003]

However, in the above-mentioned prior art, a motor for tilting the movable frame to which the monitor camera is attached is provided in the intermediate frame, so that the movable frame accompanying the tilting of the intermediate frame is provided. It is necessary to form a moving space for the driving motor, and if the tilt angle is increased, the moving space for these movable members becomes considerably large, which leads to an increase in the size of the whole child unit. In addition, as the position of the motor for driving the movable frame moves, the wiring to this also swings, and it is easy to cause accidents such as disconnection at the connection part and disconnection of wiring between members, and durability. There is still room for improvement in terms of

The present invention has been made in view of such a point, and the overall size of a TV door phone handset is increased by improving a mechanism for adjusting a tilt angle of a camera support on which a monitor camera is mounted. It is an object of the present invention to reduce the size and size of the drive motor without inviting it, and to improve the durability by using the drive motor without fear of causing wiring damage. It is another object of the present invention to reduce the size of the tilt angle adjustment mechanism of the monitor camera, reduce the load fluctuation, and increase the tilt angle of the monitor camera.

[0005]

As shown in FIG. 1, the television doorphone handset of the present invention has a ball seat 14 provided near the center of a camera support 8 on which a monitor camera 3 is mounted on the front surface. A tip end of a flexible push-pull rod 18 which is mounted on a drive case 11 disposed on the back of the drive case 11 via a ball fulcrum 13 so as to be tiltable up and down and left and right, and protrudes forward and backward from the drive case 11 forward and backward. The ball support 20 provided at a position off the ball support 14 of the camera support 8 is connected via a ball fulcrum 19 to the push-pull rod 1.
8 can be driven forward and backward by using a motor 23 and a screw feed means mounted on the drive case 11, and the camera support 8
Of the center O ₂ of the ball seat 20 of the ball seat 14
To the vertical plane of the center O ₁ of those set by polarized to the front. Two push-pull rods 18 are provided, and each push-pull rod 18 is configured to be independently movable forward and backward by a respective motor 23 and screw feed means. Let
The camera support 8 can be configured to be tilted left and right by the advance and retreat of the other push / pull rod 18.

[0006]

The push / pull rod 1 is operated by operating a switch or the like provided in the parent device in the room to appropriately operate the motor 23 in the forward and reverse directions.
8, the camera support 8 supported by the central ball fulcrum 13 tilts up and down or left and right,
The direction of the monitor camera 3 can be freely changed. At this time, the center ball fulcrum 13 and the push / pull rod 18 are attached to the camera support 8.
Of the camera support 8 in the movable space. Therefore, it is sufficient to secure a space for moving the camera support 8 and the monitor camera 3 attached to the camera support 8 and accessories in the slave unit. Since the position of the center O ₂ of the ball seat 20 of the camera support 8 is deviated forward with respect to the vertical plane of the center O ₁ of the center ball seat 14, the tip of the flexible push-pull rod 18 is moved forward. The inclination of the portion is substantially constant irrespective of the forward limit position and the retreat limit position of the push / pull rod 18, so that the load fluctuation at the time of tilt can be reduced.

[0007]

According to the present invention, the motor 23 is fixed, the camera support 8 is tilted up and down or left and right around the ball fulcrum 13, and the push / pull rod 18 is provided at the back of the camera support 8. Since the movable member only moves forward and backward linearly, the movable member is small and small, and the movable member can be compactly incorporated in a limited space. Therefore, the tilt angle of the monitor camera 3 can be increased while ensuring the miniaturization of the entire TV door phone slave unit, and the imaging range can be expanded. Since the motor 23 can be fixed to the drive case 11, there is no risk of disconnection or the like, and the durability can be improved.

In particular, if the position of the center O ₂ of the ball seat 20 of the camera support 8 is deviated forward of the center O ₁ of the center ball seat 14, the position of the push / pull rod 18 moves forward. Regardless of the limit or the retreat limit, the load fluctuation can be kept small, so that a large tilt angle can be obtained. In other words, the push / pull rod 18 can be driven forward and backward with a low load without forcibly tilting, and the motor 23 can be reduced in output accordingly, and the size can be further reduced.

[0009]

1 to 8 show an embodiment of a television door phone handset according to the present invention, which is fitted and mounted in a hole formed in a wall of a gate post or an entrance. Wired to parent device. 2 and 3,
The main body case 1 of this child device is embedded in a wall surface, and a panel case 2 is screwed and connected to the front surface thereof. Body case 1
A monitor camera 3 composed of a solid-state image pickup device such as a CCD or a MOS type, a lens, and the like is provided on the upper part of the camera. A speaker 4 and a microphone 5 are accommodated in a lower portion of the main body case 1. A see-through window 6 facing the monitor camera 3 is attached to an upper portion of the panel case 2, and a push button 7 for calling a parent device is provided below the panel case 2. When the push button 7 is pressed, an image photographed by the monitor camera 3 is displayed on a monitor television provided in the master unit for a predetermined period of time, and when the handset of the master unit is picked up, a telephone call becomes possible.

The monitor camera 3 is mounted via a printed wiring board 9 on the front surface of a camera support 8 whose attitude can be changed, as will be described later. Is illuminated by infrared irradiation to take an image.

The orientation of the camera support 8 can be arbitrarily changed and adjusted by the following angle adjusting mechanism by remote control from the master unit. The detailed structure of the angle adjusting mechanism will be described below with reference to FIGS. 1 and 4, a drive case 11 is provided inside the main body case 1.
And a ball fulcrum 13 at the front end of a column 12 erected on the front surface of the drive case 11. On the other hand, near the center of the back surface of the camera support 8, a ball seat 14 is provided at the center on the optical axis of the monitor camera 3, and the ball seat 14 cannot be pulled out to the ball fulcrum 13. As shown in FIG. 5, the camera support 8 is
3 can be tilted up and down around a horizontal horizontal axis XX passing through the center, and can be tilted left and right around a vertical vertical axis YY. In order to prevent the camera support 8 from rotating around the camera optical axis, projections 15 projecting up, down, left, and right of the ball fulcrum 13
Is engaged in a notch 16 formed in the ball seat 14.

In FIG. 4, two through holes 17 are provided on the front surface of the drive case 11 directly below and to the left of the column 12.
And a flexible push-pull rod 18 is formed from each through hole 17.
Are projected forward and backward, respectively, and a ball fulcrum 19 provided at the tip of each push / pull rod 18 is fitted and connected to a ball seat 20 formed on the back surface of the camera support 8. The projection 21 provided on each ball fulcrum 19 engages with a notch 22 formed in each ball seat 20 to prevent the rotation of each push-pull rod 18 around the axis. In FIG. 5, the drive case 11
Inside, two DC motors 23 for independently driving each push / pull rod 18 forward and backward are installed in a horizontal direction, and the output of each motor 23 is a worm 24, a worm wheel 25,
The reduction gear is transmitted to the push-pull rod drive gear 28 via the gear 26 and the intermediate gear 27. By using a combination of these gear groups having a high reduction ratio, the torque is increased despite the use of a small motor 23.

In FIG. 6, a push-pull rod drive gear 2
Numeral 8 is made of plastic and has a support shaft 30 at the center of a cylindrical boss 29 integrally formed therewith.
At 0, the hollow shaft portion of each push / pull rod 18 is slidably inserted and supported in the front-rear direction. A screw portion 31 is formed on the outer periphery of each push / pull rod 18, and the cylindrical boss 29 is provided with three claws 32 engaging with the screw portion 31 so as to be cantilevered and elastically deformable. As the rod drive gear 28 rotates forward or backward and the pawl 32 rotates, the push-pull rod 18, whose rotation has been prevented, is relatively screwed forward and moves forward and backward.

In the figure, the drive structure of the push-pull rod 18 for tilting vertically downward is shown, but the drive structure of the push-pull rod 18 for tilting upper left and right is the same structure.

[0015] For example, as shown in the comparative example in FIG. 9, when positioning the center O ₂ of the center O ₁ and the ball seat 20 of the central sphere seat 14 of the camera support base 8 on the same vertical plane ,
When the push / pull rod 18 reaches the forward limit position and the retreat limit position, respectively, the distance h between the center O ₂ of the ball fulcrum 19 at the tip and the axis S of the support shaft 30 is the same, and therefore, it is flexible. The maximum inclination of the tip of the push-pull rod 18 is h /
In L, when the push / pull rod 18 is at the retreat limit position, the load becomes the maximum, so that the inclination angle of the camera support 8 cannot be made large. Here, the distance B from the center O ₁ of the central ball seat 14 to the axis S of the support shaft 30 depends on whether the push-pull rod 18 swings when the camera support 8 is tilted up and down or left and right. Set to the minimum value.

Therefore, in the present embodiment, as shown in FIG. 8, the center O ₂ of the ball seat 20 of the camera support base 8 is
The position is set to the front side by A with respect to the vertical plane of the center O ₁ of _No. 4. The dimension A and the dimension B are set to the minimum values at which the push / pull rod 18 can swing when the camera support 8 is tilted up and down or left and right. By setting the position of the center O ₂ of the ball seat 20 in front of the center O ₁ of the ball seat 14 in this manner, when the camera support 8 is tilted, the support shaft 3
0 is smaller on the rear side (retreat side) than the vertical plane of the center O ₁ of the ball seat 14 and the center O of the ball seat 14 is small.
_It becomes larger on the front side (forward side) than the vertical plane of ₁ . Therefore, the inclination (h) of the tip of the flexible push-pull rod 18
/ L), the position of the push-pull rod 18 is substantially constant regardless of the forward limit and the backward limit, and the load fluctuation at the time of tilting of the camera support 8 can be suppressed small, and the tilt angle of the camera support 8 can be reduced. Can be large.

Although not shown, a screw portion is provided on the side of the cylindrical boss 29 of the push / pull rod driving gear 28 as a screw feed means of the push / pull rod 18, and the push / pull rod 18 is provided with a claw engaging with the screw portion. It can also be provided.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a drive unit of a camera support.

FIG. 2 is a perspective view of a drive unit of the camera support base.

FIG. 3 is an overall vertical side view.

FIG. 4 is an overall perspective view of a TV door phone handset.

FIG. 5 is a front view of a driving unit of the camera support base.

FIG. 6 is an exploded perspective view showing a push-pull rod and its driving gear.

FIG. 7 is a rear view of the camera support base.

FIG. 8 is a vertical sectional side view of a main part showing a tilting movement of the camera support base.

FIG. 9 is a vertical sectional side view of a main part showing a tilting movement of a camera support base showing a comparative example.

[Explanation of symbols]

 Reference Signs List 3 monitor camera 8 camera support stand 11 drive case 13.19 ball fulcrum 14.20 ball seat 18 push-pull rod 23 motor

Claims (2)

(57) [Claims] 1. A ball seat 14 provided near the center of a camera support 8 on which a monitor camera 3 is mounted on the front face is tilted up and down and left and right via a ball fulcrum 13 to a drive case 11 disposed on the back of the ball support. The ball receiving seat 14 of the camera support 8 is attached to the tip of a flexible push / pull rod 18 which is freely attached and protrudes forward and backward from the drive case 11 so as to be able to move forward and backward.
The ball receiving seat 20 provided at a position deviated from the ball is connected via a ball fulcrum 19, and the drive case 11 is equipped with a motor 23 for driving the push-pull rod 18 forward and backward and screw feed means. When the support base 8 is in the vertical position, the position of the center O ₂ of the ball seat 20 is set to be shifted forward with respect to the vertical plane of the center O ₁ of the ball seat 14. TV doorphone child device. 2. A push / pull rod 18 is provided in two positions, and each push / pull rod 18 can be independently driven to advance and retreat by a motor 23 and a screw feed means. 2. The television doorphone slave unit according to claim 1, wherein the support base 8 is tilted up and down, and the camera support base 8 is tilted left and right by moving the other push / pull rod 18 forward and backward.