JPH0644468A - Optical axis adjustment system for beam sensor - Google Patents

Abstract

PURPOSE:To adjust the optical axis of a beam sensor in a short time by one person. CONSTITUTION:A transmitter 5 and a display device 6 are arranged near a light receiver R and a light receiving level is supplied from the light receiver R. In such a manner, the transmitter 5 encodes the light receiving level by a prescrived method and transmits a light receiving level value by radio transmission using radio waves and the display device 6 displays the light receiving level. A reception device 1 is arranged near a light projector T and a receiver 2 receives the radio waves transmitted from the transmitter 5 to be demodulated and decoded and displays the light receiving level value at the display device 3. Thus, an operator can adjust the optical axis by adjusting the light projecting optical system of the light projector T so as to maximize the value of the light receiving level displayed at the display device 3 and adjusting a light receiving optical system so as to maximize the light receiving level while confirming the light receiving level displayed at the display device 6 similarly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam sensor system in an alarm system in which a light transmitter and a light receiver are arranged to face each other, and more particularly to an optical axis adjusting method thereof.

[0002]

2. Description of the Related Art Conventionally, an infrared projector (hereinafter simply referred to as a projector) and an infrared receiver (hereinafter simply referred to as a receiver)
An alarm system is known in which the and are opposed to each other,
In the alarm system, the presence or absence of an intruder can be detected by projecting infrared rays from the projector toward the light receiver and detecting the light reception level at the light receiver. Therefore, in the alarm system, the light projecting optical system of the projector and the light receiving optical system of the light receiver need to be correctly opposed to each other. Therefore, conventionally, the following work has been performed.

An operator is attached to each of the light-emitter side and the light-receiver side, and after performing a rough visual alignment, the light-projecting optical system of the light-emitter is projected by infrared rays from the light-emitter by a predetermined means such as a driver. It is moved in the left-right direction, and the infrared detection level in the light receiver at that time is measured by a worker on the light receiver side with a tester or the like, and the position at which the detection level is maximum is notified by a transceiver or the like. As a result, the operator on the projector side fixes the horizontal position of the projection optical system to a position where the detection level of the receiver is maximized, then moves the projection optical system at that position in the vertical direction, and similarly. The vertical position of the projection optical system is fixed at the position where the detection level of the photodetector becomes maximum. When the above work is completed, the operator on the light emitter side notifies the operator on the light receiver side to that effect. As a result, the operator on the light receiver side first moves the light receiving optical system in the left-right direction to determine the position where the detection level becomes maximum, and then determines the vertical position where the detection level becomes maximum at that position. The above work is usually performed twice or three times.

[0004]

As described above, at least two workers are required for the conventional optical axis adjustment, and in addition to being time consuming, a high degree of skill is required for the work. It was a thing. This is particularly remarkable as the distance between the light transmitter and the light receiver increases. Therefore, improvement of work efficiency has been strongly desired. The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical axis adjustment method for a beam sensor that enables one person to easily perform optical axis adjustment.

[0005]

In order to achieve the above object, the optical axis adjusting method of the beam sensor according to the present invention is such that the light receiving level can be transmitted by wireless communication on the light receiver side and the light receiving level on the light emitter side. It is characterized in that the information transmitted from the light receiver side can be received and the light reception level obtained by the reception can be displayed.

[0006]

FUNCTION AND EFFECT OF THE INVENTION The photodetector side can detect the light reception level and wirelessly transmit the value. On the other hand, the light emitter side can receive the information transmitted from the light receiver side and display the light reception level value. Therefore, the light reception level value in the light receiver is wirelessly transmitted, received by the light emitter side, and the light reception level is displayed on an appropriate display means, so that the operator on the light emitter side can know the light reception level in the light receiver, The optical axis of the projection optical system of the projector can be adjusted while checking the received light level value.

The optical axis adjustment of the light receiving optical system of the light receiver is
It can be performed while confirming the light receiving level as in the conventional case. Therefore, the optical axes of the light projector and the light receiver can be easily adjusted by one person, and the work efficiency when installing the beam sensor system can be greatly improved as compared with the prior art.

[0008]

Embodiments will be described below with reference to the drawings.
FIG. 1 is a diagram showing a configuration of an embodiment of an optical axis adjusting system of a beam sensor according to the present invention, in which T is a projector, R is a projector, 1 is a receiving device, 2 is a receiver, and 3 is a display. , 4 is an antenna, 5 is a transmitter, 6 is an indicator, and 7 is an antenna.

The projector T projects an infrared beam, and includes an infrared light emitting element such as a light emitting diode (LED),
It is configured by a light projecting optical system including the drive circuit and a reflecting mirror. The infrared beam projected from the light projector T is received by the light receiver R. The light receiver R is composed of an infrared light receiving element such as a photodiode, a light receiving level detection circuit, and a light receiving optical system including a reflecting mirror and the like.

In the vicinity of the light receiver R, the transmitter 5,
A display 6 is arranged. A light receiving level is given to the transmitter 5 and the display 6 from the light receiver R. Specifically, for example, the light receiver R may be provided with an output terminal for the voltage obtained by receiving the light, and this voltage may be supplied to the transmitter 5 and the display 6 by an electric wire or the like.

As a result, the transmitter 5 encodes the light receiving level given from the light receiver R by a predetermined method and transmits the light receiving level value by radio transmission using radio waves. The display 6 similarly displays the light reception level given from the light receiver R. The display 6 may be of any type as long as it functions as a level meter.

In the vicinity of the projector T, a receiver 1 including a receiver 2, a display 3 and an antenna 4 is arranged.
The receiver 2 receives the radio wave transmitted from the transmitter 5, demodulates and decodes the received information to obtain a light reception level. This received light level value is transferred to the display unit 3 and displayed on the display unit 3. Here, the display 3 may be any display as long as it functions as a level meter like the display 6.

In the above structure, the optical axis adjustment of the projection optical system of the projector T is performed as follows. First, an operator attaches to the projector T side, for example, and activates the projector T and the receiver 1. At this time, it is natural that the transmitter 5 is adapted to be able to receive the light reception level value from the light receiver R, and that the light receiver R and the transmitter 5 need to be in the operating state. As a result, the light reception level value is transmitted from the transmitter 5. Then, the information transmitted from the transmitter 5 is received by the receiver 2, demodulated and decoded, and the received light level wirelessly transmitted is displayed on the display 3.
Therefore, the operator can perform the optical axis adjustment by adjusting the light projecting optical system of the light projector T so that the value of the light receiving level displayed on the display device 3 is maximized.

The above is the optical axis adjustment of the projection optical system of the projector T, but the optical axis adjustment of the light receiving optical system of the light receiver R is performed by the light receiver R.
Connect so that the received light level at can be displayed on the display unit 6,
The light receiving optical system may be adjusted so as to maximize the light receiving level while checking the light receiving level displayed on the display 6.

With the above, one cycle of the optical axis adjustment is completed, and thus the light projecting optical system and the light receiving optical system face each other almost correctly, but by performing the above optical axis adjustment once or twice, The adjustment accuracy of the optical axis adjustment can be further improved.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the receiving device 1 is provided separately from the projector T and is arranged near the projector T when adjusting the optical axis. However, the projector T may be provided with a receiver and a display. . Similarly, the light receiver R may include a transmitter and an indicator.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of an optical axis adjusting system of a beam sensor according to the present invention.

[Explanation of symbols]

T ... Projector, R ... Projector, 1 ... Receiver, 2 ... Receiver,
3 ... Indicator, 4 ... Antenna, 5 ... Transmitter, 6 ... Indicator,
7 ... antenna.

Claims (1)

[Claims] 1. The light receiving side can transmit the light receiving level by wireless communication, and the light emitting side can receive the information transmitted from the light receiving side and display the light receiving level obtained by the reception. A method for adjusting the optical axis of a beam sensor characterized by being performed.