JPH0235736Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that uses energy waves to detect passengers, luggage, etc. near the entrance/exit of an elevator hall, and controls the opening/closing operation of the doors.

Generally, methods that use radio waves or ultrasonic waves are well known as methods for detecting moving objects such as passengers using energy waves. That is, although a detailed explanation will be omitted, as shown in FIG. Reflected waves 6 from passengers 5 and the like are input to a receiving section 7. Reference numeral 8 is an amplifier for adjusting detection sensitivity, and reference numeral 9 is a detection circuit, which detects the presence or absence of an object such as a passenger based on the difference frequency between the radiated wave 4 and the reflected wave 6, or the level of the reflected wave 6. Emits an output signal if present. Reference numeral 10 denotes a door control circuit which opens the door in reverse according to its output signal.

By the way, the reflection status of radio waves and ultrasonic waves changes depending on the environment of the landing (floor condition, size, presence of objects, etc.). In such cases, it is less likely to reflect radio waves than the floor such as tiles on a regular floor, and this is equivalent to lowering the detection sensitivity.

However, in the past, detection sensitivity adjustment was set to a constant value regardless of the condition of each landing.
This system had disadvantages such as being prone to malfunctions on certain floors.

This invention was developed to solve the above-mentioned problems, and even if the environment of the landing on a specific floor is different from that of a general floor, the detection sensitivity is automatically switched so that the elevator stops. To provide an elevator door control device that does not cause malfunction regardless of the floor.

The present invention will be explained below based on the drawings.

FIG. 2 is a circuit diagram showing an embodiment of an amplifier for adjusting detection sensitivity according to the present invention. In the diagram, R ₁ is a variable resistor, R ₂ to _{R 4} are resistors, OA is an operational amplifier, and Xa
is a contact that closes when the elevator is stopped at the X floor, and Ya is a contact that closes when the elevator is stopped at the Y floor.

With the above configuration, for example, when the elevator is stopped on a general floor, contacts Xa and
Since Ya are both open circuits, the detection sensitivity is determined by the variable resistor _R1 and the resistors _R2 to _R4 . Additionally, when the elevator stops on the X floor, which has a different hall environment than the general floor, the contact Xa is closed, that is, the resistor R ₂ is short-circuited, so the detection sensitivity is determined by the variable resistor R ₁ and the resistors R ₃ and R ₄ . be done. Similarly, the detection sensitivity at the Y floor is determined by variable resistor R ₁ and resistors R ₂ and R ₄ .
Therefore, when adjusting the detection sensitivity, once you set the resistors R ₁ to _{R 4} so that the detection sensitivity for each floor is optimal, the detection sensitivity will automatically switch depending on the elevator stop position. Even if there are floors with different landing environments in one building, malfunctions can be prevented, and stable and highly accurate passenger detection, as well as door control, can be performed at all times.

Note that in the above embodiment, only the resistor _R1 is variable, but the present invention is not limited to this, and various other modifications can be made without changing the gist of the present invention.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the structure of an elevator door control device according to the present invention, and FIG. 2 is a circuit diagram showing an embodiment of an amplifier according to the present invention. 2... Oscillator, 3... Transmitter, 4... Radiation wave,
6...Reflected wave, 7...Receiving section, 8...Amplifier, 9
...Detection circuit, 10...Door control circuit, Xa, Ya
... Relay contact, R ₁ ... Variable resistance, R ₂ ~ _{R 4} ...
...Resistor, OA...Operation amplifier.

Claims (1)

[Scope of utility model registration request] A detector installed in the elevator car radiates energy waves near the entrance/exit of the elevator hall, and detects moving objects near the entrance/exit of the hall by receiving reflected waves from the floor, objects, etc., and uses this detection output. An elevator door control device that controls an elevator door, comprising means for detecting a floor at which the elevator stops, and means for automatically switching the detection sensitivity of the moving object to a preset sensitivity according to the floor at which the elevator stops. An elevator door control device comprising: