JPH0453367A - Panning tilt mechanism for interphone having monitor tv receiver - Google Patents

Abstract

PURPOSE:To improve the operability in the case of panning and tilt operation by outputting a detection signal from a maximum movement detection means when a television camera section reaches a maximum moving range and stopping the movement of a television camera in response to the detection signal. CONSTITUTION:Microswitches 11-14 are used as a maximum movement detection means. When each of the microswitches 11-14 is in contact with a lens base 4, its contact is closed and the press contact of the lens base 4 with an interphone slave set main body 1, that is, the arrival of a television camera section 6 to a maximum movement range is outputted as its detection signal. Then a motor control circuit 19 stops the drive of a vertical drive motor 22 in response to the detection signal to prevent the lens base 4 from being in contact with the interphone slave set main body 1. Thus, the operability of a panning tilt switch is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an intercom with a monitor TV that allows visitors to be confirmed, and in particular, the present invention relates to an intercom with a monitor TV that allows visitors to be confirmed. This invention relates to a pan/tilt mechanism for an intercom with a monitor TV that can adjust its direction to the position of a visitor.

[Prior Art] With the recent miniaturization, lightness, and cost reduction of television cameras, various types of intercoms (hereinafter referred to as
(abbreviated as video door phone) has been developed.

A conventional video door intercom includes an intercom slave unit B shown in FIG. 3 and an intercom base unit A shown in FIG. 4. Referring to FIG. 3, the intercom handset B includes an intercom handset body 1, a television camera body 3, and a lens stand 4.
and a television camera part 6 including a camera lens 5, and four rods 2a attached to the top, bottom, left and right sides of the lens stand 4,
2b.

2c and 2d are expanded and contracted by a motor (not shown) to drive the television camera section 6 vertically and horizontally. A mechanism that combines a tilt mechanism that moves vertically and a pan mechanism that moves horizontally is generally referred to as a pan-tilt mechanism.

Referring to FIG. 4, the intercom base unit A includes an intercom base unit body 7, a handset 8 for communicating with a visitor by voice, a monitor screen 9 for displaying the visitor's image, and a television camera portion 6. The device includes a tilt switch 10 for outputting a signal for driving the intercom handset B up and down and left and right, and a signal line C for exchanging signals with the intercom handset B.

With the video door intercom described above, in response to a visitor's call, a person in the room operates the tilt switch 10 of the intercom base unit A to move the TV camera portion 6 of the intercom slave unit B to the visitor's position. You can move towards it. The image of the visitor captured by the television camera body 3 is sent to the intercom base unit A through the signal line C.

The visitor's appearance is displayed on the monitor screen of intercom base unit A.

This makes it extremely convenient because you can have a conversation while looking at the screen as well as using your voice.

[Problems to be Solved by the Invention] By the way, as a method for stopping the movement of the television camera portion 6,
As shown in FIG. 5, it is conceivable that the end of the lens stand 4 comes into contact with the handset main body 1 to lock the vertical and horizontal drive parts 2.

However, if the visitor is short and the television camera section 6 is moved downward as far as it will go, the lens stand 4
The bottom edge of the intercom handset unit 1 is the
It will hurt. Furthermore, when operating the pan/tilt switch 10 of the intercom base unit A, care must be taken to prevent the lens stand 4 from hitting the intercom slave unit body, which poses a problem in operability.

In addition, if the visitor's image is not displayed, there is a possibility that the motor will continue to press the pan/tilt switch in an attempt to turn the screen further downward.

This invention was made in view of the above problems, and provides a pan-tilt mechanism for an intercom with a monitor TV that prevents the lens stand from hitting the intercom handset body and improves the operability of the pan-tilt switch. The purpose is to provide.

[Means for Solving the Problems] To achieve the above object, the pan/tilt mechanism of the intercom with a monitor TV of the present invention includes an intercom slave unit having a TV camera that images a visitor, and an image sent from the TV camera. An intercom with a monitor television, which is equipped with an intercom main unit having a display means for displaying visitors on a screen based on a signal, comprising: an imaging direction moving means for moving the imaging direction of the television camera vertically and horizontally; and a television. maximum movement detection means for setting a maximum movement range of the camera and detecting that the movement of the television camera has reached the maximum movement range; and said imaging direction movement means in response to a detection signal from said maximum movement detection means. and stopping means for stopping the.

[Operations] According to the present invention having the above configuration, the maximum movement detecting means,
The maximum movement range of the television camera is set, for example, so that the camera stand does not hit the intercom handset, and when it is detected that the television camera reaches the maximum movement range, a detection signal is output to a stopping means. Then, the stopping means stops the imaging direction moving means in response to this detection signal. In this way, the movement of the television camera is stopped, so
The person operating the intercom base unit no longer needs to pay attention to the contact between the television camera and the intercom slave unit when performing pan/tilt operations.

[Embodiment] Fig. 1 shows an intercom handset B showing an embodiment of the present invention.
FIG. 2 shows the internal circuit of the intercom handset body 1 shown in FIG. 1 above. In addition, intercom base unit A
The configuration is the same as that shown in FIG. 4, and the explanation will be omitted.

Referring to FIG. 1, the difference between the intercom handset B of this embodiment and the intercom handset shown in FIG. 11 is arranged, a lower limit microswitch 12 is arranged at the position where the lower end of the lens stand 4 and the intercom handset main body 1 touch, and a left limit microswitch 13 is arranged at the position where the left end of the lens stand 4 and the intercom handset main body 1 touch. is arranged, and a right limit microswitch 14 is arranged at a position where the right end of the lens stand 4 and the intercom handset body 1 are in contact with each other. Each of the above microswitches is
When it comes into contact with the lens stand 4, the contact is closed and a signal is output that detects that the lens stand 4 has come into contact with the intercom handset body 1, that is, that the television camera portion 6 has reached its maximum movement range.

In FIG. 2, the intercom handset body 1 includes terminals 23 and 24 to which a power supply voltage is applied, and current limiting resistors Ra and Rb connected to the terminal 23.

microswitches 11 1 connected between R, c, and Rd, and the respective resistors Ra, Rb, Rc, and Rd, and the terminal 24;
2, 13, 14, an AND gate 15 which manually inputs the pan/tilt operation signal "Right" from the intercom base unit A and the signal from the micro switch 14, and the pan/tilt operation signal "Right" from the intercom base unit A.
An AND gate 16 which receives the signals from "Left" and the microswitch 13 as inputs, and an AND gate which receives the signals from the pan/tilt operation signal "Down J" and the microswitch 12 as inputs.
A gate 17, an AND gate 18 which inputs the pan/tilt operation signal "up" and a signal from the microswitch 11, and a motor that drives the left/right motor 21 or the up/down motor 22 through the connector 20 in response to the output of each of the AND gates. It has a control circuit 19.

The motor control circuit 19 rotates the left and right motors 21 in the normal direction when the AND gate 15 becomes high level, and rotates the left and right motors 21 in the reverse direction when the AND gate 16 becomes high level. Further, when the output of the AND gate 17 becomes high level, the vertical motor 22 is rotated in the normal direction, and when the output of the AND gate 18 becomes high level, the vertical motor 22 is rotated in the reverse direction.

The operation of the video intercom shown in FIGS. 1 and 2 will be explained. Now, there is a visitor, and a ring tone is emitted from the intercom A in the room, and the person in the room picks up the handset 8 and confirms the visitor's face or figure while looking at the monitor screen, as shown in Figure 4. Operate the pan/tilt switch 10 in either the left, right, up, or down direction. For example, when the television camera portion 6 is directed downward, the pan/tilt switch 10 is operated to set "down" to a high level, and the AN
The D gate 17 gives a high level signal to the motor control circuit 19 until the microswitch 12 outputs a low level signal. The motor control circuit 19 controls the vertical motor 2 in response to the high level signal from the AND gate 17.
Drive 2. This causes the television camera portion 6 to face downward.

Then, when the television camera section 6 moves and the microswitch 12 is turned on, a low level signal is output from the microswitch 12, and the output of the AND gate 17 becomes low level. In response to this low level signal, the motor control circuit stops driving the vertical motor 22. This can prevent the lens stand 4 from hitting the intercom handset body 1. Hereinafter, even if the TV camera portion 6 is moved upward, to the left side, or to the right side, the micro switch 11 attached to the intercom handset body 1,
Since the contacts 13 and 14 are closed, the operations of the vertical motor 22 and the left and right motors 21 are stopped, and the lens stand 4 is no longer tilted. That is, the operation of the vertical, horizontal, and horizontal drive portions 2 is completely stopped.

According to the above embodiment, the intercom handset main body 1 does not come into contact with the lens stand 4 and damage the appearance of the intercom handset main body 1. In addition, it is possible to prevent vibrations and abnormal noises of the motor when the motor of the vertical and horizontal drive portions 2 attempts to further move the lens stand while it is in contact with the lens stand 4 and the intercom handset body 1. Furthermore, every time you pan and tilt the intercom base unit A indoors, you can use the intercom base unit without having to worry about whether the lens base 4 hits the intercom base unit body 1 (if it does, you must immediately release the pan/tilt switch). The user can safely operate the television camera section 6 of the intercom handset B in the desired direction while looking at the monitor screen of A.

In the above embodiment, a microswitch was used as the maximum movement detection means, but it is possible to use a proximity switch or a photo sensor instead of the microswitch, as long as the gist of the invention is not changed. Various design changes are possible.

[Effects of the Invention] According to the present invention described above, when the television camera section reaches the maximum movement range, the maximum movement detection means outputs a detection signal, and in response to this detection signal, the stopping means stops the movement of the television camera. Since the TV camera can be stopped, the appearance of the intercom handset will not be damaged due to excessive movement of the television camera, and operability in pan-tilt operations can be improved.

[Brief explanation of the drawing]

Fig. 1 is an external side view of an intercom handset B showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the intercom handset shown in Fig. 1, and Fig. 3 is an external side view of a conventional intercom handset. , FIG. 4 is an external front view of the intercom base unit A, and FIG. 5 is a diagram illustrating the case where the lens stand 4 corresponds to the intercom slave unit body 1. In the figure, A is the intercom main unit, B is the intercom handset, 1 is the intercom handset main unit, 2 is the vertical and horizontal drive parts, 3 is the TV camera main body, 4 is the lens stand, 5 is the camera lens, and 6 is the TV camera part. , 8 is the handset, 9
is the monitor screen, 10 is the pan/tilt switch, 11 to 14
is a micro switch, 15 to 18 are AND gates, 19
21 is a motor control circuit, 21 is a left and right motor, and 22 is a vertical motor.

Claims (1)

[Scope of Claims] An intercom with a monitor TV that includes an intercom slave unit that has a TV camera that images a visitor, and an intercom base unit that has a monitor TV that displays a screen based on the video signal sent from the TV camera. , an imaging direction moving means for moving the imaging direction of the television camera of the intercom handset vertically and horizontally; and a means for setting the maximum movement range of the television camera and detecting when the movement of the television camera has reached the maximum movement range. and a stopping means for stopping the imaging direction moving means in response to a detection signal from the maximum movement detecting means.
Pan/tilt mechanism for intercom with monitor TV.