JPS647453B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical relay that receives modulated light projected or infrared rays emitted from an object and detects passage of the object. More specifically, the present invention relates to an optical relay that also identifies the passing direction of an object.

Conventionally, optical relays such as those shown in FIGS. 1A to 1B are well known. That is, the optical relay A shown in FIG. FIG. 3 is a schematic diagram showing how the relay is used. Although this reflective optical relay is easy to install and adjust, it cannot detect the direction in which an object passes, and the amount of light received may change due to vibrations of the mounting surface E or objects in the detection range, even if no object passes, resulting in malfunction. There is also a risk of malfunction when insects fly into the detection range, resulting in a lack of reliability. Further, FIG. 2 is a schematic diagram showing a direction sensing type optical relay composed of two sets of opposite type optical relays. Two sets of optical relays, a receiver G ₁ for the emitter F ₁ and a receiver G ₂ for the emitter F ₂ , are installed in parallel, and the outputs of the receivers G ₁ and G ₂ are amplified, detected, change detection, level judgment, etc. A signal processing circuit consisting of
The signal is input via H ₁ and H ₂ to a moving direction detection circuit J consisting of a circuit that stores the input order of the light receiving elements and an AND circuit for both light receiving circuits, and the output of this moving direction detection circuit is used to control the alarm circuit and display. Although this is an optical relay that operates circuit K, it has the disadvantage that the light receiving ranges of two sets of optical relays installed in parallel must be carefully set, making installation settings difficult. That is, two floodlights F ₁ , as shown in Fig. 2 A to D,
The light emitting range of _F2 can be set, but the light receiving range of _G1 , _G2
Depending on the arrangement of the signal processing circuit and the configuration of the signal processing circuit, detection may not be possible in FIG. 2A or FIG. 2D.

This invention was made in view of the above-mentioned drawbacks, and aims to provide an optical relay that is easy to install and adjust and is highly reliable. In an optical relay that detects
The detection body includes a signal processing circuit including a moving direction discrimination circuit that discriminates the order in which light is received by the individual light receiving elements and outputs different signals depending on the moving direction of the object, and a display means driven by the output of this signal processing circuit. By fixing two light-receiving elements at a constant interval to a printed circuit board fixed in the case and cover of the detection main body, the mutual positional relationship of the two light-receiving elements and the optical system of the light-receiving elements is kept constant. The optical relay is characterized in that the joint protrudingly fixed to the detection body and the mounting base are connected by a universal joint, so that the light-receiving element and its optical system can be rotated independently of the mounting base. It is something. Examples will be described in detail below.

In the figure, 1 is a detection main body, 1 is a cylindrical case, and a female thread 1a is provided inside an opening 2 of the case 1. An opening 2 of this case 1 is covered with a front cover 3. Front cover 3
is made of transparent resin and is coupled to a surrounding frame 4 for coupling to the case 1. The peripheral frame 4 is provided with a male threaded portion 4a. Reference numeral 5 denotes a protrusion, which connects support frames 7, 7 that support printed boards 6, 6 with pin screws 8, 8. Reference numeral 9 denotes a light emitting element, which is soldered to a printed board, and modulated light emitted from the light emitting element 9 is projected to the outside as parallel light by a semi-parabolic reflecting mirror 10. 11 is a light receiving element;
2 is a hood. The light receiving element and the hood are the fifth
As shown in the figure, there are two of them, and as shown in FIG. 6, the front cover 3 has a cylindrical convex part 14 for locking the lenses 13, 13, a housing part 16 for the speaker 15 in the center, and a groove 17 for fitting the printed board. It is equipped with 1
8 is a wire mesh that covers the front surface of the speaker 15. 1
9 is a volume, 20 is a changeover switch, 21 is a transformer, and 22 is an electronic component. 11 is a joint, 23, 23 is an L-shaped part 24, 24 with a screw 2
5 and 25 are legs fixed to the case 1, and the distance l can be adjusted with a tightening screw 26. 27 is Natsuto 2
At 8, one end is connected to the lid 29 of the mounting base, and the other end is a fixed foot with a spherical part 30. Make it touch the spherical surface. The lid body 29 has an L
Letter-shaped hook blades 32, 32 are provided, and the hook blades 3
2, 32 and electric wires 33, 33 to connect to the printed board 6 inside the detection main body 1. Reference numeral 34 denotes a pedestal constituting a mounting base, on which terminal plates 36, 36 integrally provided with blade holder springs 35, 35, which are hooked and connected to the hooking plug blades 32, 32, are fixed, and the screws 3 to the construction material are fixed.
7 through holes 38 are provided.

FIG. 7 shows a block diagram. Numeral 39 is a light projection circuit for driving the light emitting element 9, and is composed of an oscillation circuit and a drive circuit. Note that the light emitting circuit is not necessarily necessary, and the light receiving elements 11, 1
It is unnecessary if 1' is used to detect infrared rays emitted from the human body, automobile, or the like.
40, 40 are circuits for processing the signals received by the light receiving elements 11, 11', which include a tuning amplification circuit synchronized with the period of light emitted from the light emitting element, a detection circuit, a low-pass filter, a low-pass amplifier, and a waveguide circuit. Consists of a shape shaping circuit. 41 is the light receiving element 11,
11' is a moving direction determining circuit for determining the order of light reception of the light receiving elements, and is composed of, for example, a differential phase detection circuit, an in-phase detection circuit, etc., and detects the order of light reception of the light receiving elements. 42 is a display means, and when moving from the X direction, a signal α is output from the moving direction determining circuit 41.
When moving from the Y direction, a β signal is output,
The signal is input to the synthesized speech generation circuit via the changeover switch 20, and is output from the speaker via the amplifier. For example, for movement from the X direction, ``Irresistible'', for movement from the Y direction,
Announce "Thank you." Also r
is the range of light projected from the light emitting element, and 8 and 8' are the light receiving ranges of the light receiving elements 11 and 11'. The arrangement of the light emitting element and the light receiving element is adjusted in advance so that the light receiving ranges of both the light receiving elements 11 and 11' do not overlap.

Therefore, as shown in FIG. 8, the pedestal 34 of the mounting base
Attach the inner side wall 4 of the inlet 43 using the mounting screws 37.
4 and connect the power wire to the terminal boards 36, 36. Next, the hook blade 3 of the lid 29 of the mounting base
2 and 32 are hooked and connected to the blade receiving springs 35 and 35 which are integrated with the terminal plates 36 and 36 of the pedestal 34, thereby electrically and mechanically connecting the detection main body 1 and the mounting base. Next, insert the front cover 3 of the detection main body 1 into the entrance 43.
Use the joint to move and adjust so that it faces the direction. The detection main body 1 includes a light emitting element 9, a light receiving element 11,
11' is installed in an adjusted manner, so it is only necessary to point it in the detection direction. That is, the modulated light (a in FIG. 9) projected from the light emitting element 9 is reflected by the human body moving in the Y direction, and the reflected light is received in the order of the light receiving element 11 and the light receiving element 11'. The signals are amplified in the order shown on the left in FIG. 9, and the waveform-shaped outputs are input to the differential phase detection circuit as shown in FIG. This differential phase detection circuit is constructed so as to generate a pulse at the rising edge of the light reception signal on the side that received the light later, as shown in FIGS. For movement in the Y direction, a signal β is output as shown in FIG. 9F. It is processed by the movement direction detection circuit 41 which determines the order of light reception, and an output β is outputted, and a sound saying "I'm irritated" is emitted from the speaker of the display means 42.
If the sound is in the opposite direction of the object's movement, use the changeover switch 20 to reverse the direction and change the mounting location to 4.
There is no need to change it to 4'. Also, a male threaded portion 4 provided on the peripheral frame 4 connected to the periphery of the front cover 3
The light emitting element 9, the light receiving element 11,
Correct display can also be obtained by rotating the mount 180 degrees while maintaining the relative position of 11'.

As described above, according to the present invention, in an optical relay that detects the passage of an object by detecting a change in the amount of light received when an object passes, two relays are arranged so that the light receiving ranges are separated and independent and do not overlap. A light receiving element,
A detection main body equipped with a signal processing circuit including a moving direction discrimination circuit that discriminates the order in which light is received by the two light receiving elements and outputs different signals depending on the moving direction of the object, and a display means driven by the output of this signal processing circuit. By fixing two light-receiving elements at a constant interval to a printed circuit board fixed in the case and cover of the detection main body, the mutual positional relationship of the two light-receiving elements and the optical system of the light-receiving elements can be determined. keep it constant,
The optical relay is characterized in that the joint protruding and fixed to the detection body and the mounting base are connected by a universal joint so that the light receiving element and its optical system can be rotated independently of the mounting base. It can be installed even if there are restrictions on the installation location, and furthermore,
Even if the detection direction of the human body or object and the display direction of the display means do not match after installation,
Since there is no need to reinstall, there is no need to consider the direction of movement during installation, and the installation is easy and can be done by even an amateur.

In the embodiments of the present application, a case is shown in which a light emitting element is built into the detector body, but the light emitting element is not necessary when a sensing element that detects infrared rays emitted from a human body is used as a light receiving element.

[Brief explanation of drawings]

1 and 2 are diagrams showing a conventional example of the present invention, in which FIG. Schematic diagram when detecting the moving direction of an object, 2nd
Figures A to D are schematic diagrams showing the light emitting ranges of the two sets of opposing optical relays shown in Figure 1B. 3 to 7 are drawings for explaining an embodiment of the invention of the present application, in which FIG. 3 is a perspective view, FIG. 4 is a sectional view, FIG. 5 is a partial perspective view, and FIG. 6 is a front cover 3. 7 is a block diagram, FIG. 8 is a schematic diagram showing the installation state, and FIG. 9 is a diagram showing signal waveforms at points P to U and αβ shown in FIG. 7. . ...detection body, ...fitting, ...mounting base,
1...Case, 3...Surface cover, 9...Light emitting element, 10...Semi-parabolic reflector, 11, 11'...
Light receiving element, 12...Hood, 15...Speaker, 20...Switch switch, 32...Hook blade,
35...blade receiver spring, δ, δ'...light receiving element, 11,
11' light receiving range.

Claims (1)

[Claims] 1. In an optical relay that detects the passage of an object by detecting changes in the amount of light received when the object passes, two light receiving elements are arranged so that the light receiving ranges are separated and independent and do not overlap, and these two A detection main body includes a signal processing circuit including a movement direction discrimination circuit that discriminates the order in which light is received by the light receiving element and outputs a different signal depending on the direction of movement of the object, and a display means driven by the output of the signal processing circuit, By fixing two light-receiving elements at regular intervals to a printed circuit board fixed in the case and cover of the detection main body,
The mutual positional relationship of the light receiving element and the optical system of the light receiving element is maintained constant, and the joint protruding and fixed to the detection body and the mounting base are connected by a universal joint, and the light receiving element is fixed regardless of the mounting angle. and an optical relay characterized in that its optical system is rotatable.