JPS645358B2 - - Google Patents

Description

Detailed Description of the Invention This invention relates to the structure of an ultrasonic intrusion detector, a radio wave intrusion detector, a light beam intrusion detector, etc., and its purpose is to accommodate both a signal generation part and a reception part. It is an object of the present invention to provide a small and inexpensive detector in which a signal from a signal generating section is prevented from directly entering a receiving section within a housing.

There have been many detectors of this type in the past, but as shown in Figure 1, the signal generating part A and the receiving part B are covered separately with shield boxes C and D, and then fixed to the surface of the case E. As shown in Fig. 2, there are detectors that have an internal box body 4 that covers the signal generating section with the signal generating section A and the receiving section B separated by a partition wall F. Since it is covered twice with the shell H and the shield boxes C and D or the inner box G, the outer shell H is mainly used for design purposes only, resulting in material loss, which increases the price. In addition, as shown in Fig. 3, in the case of ultrasonic type, radio wave type, etc., the signal generation part A
If there is no partition wall between the signal generating section A and the receiving section B, if there is not enough space between them, the signal I will enter directly from the signal generating section A to the receiving section B, resulting in an extremely low sensitivity. There was a drawback that I couldn't do it.

This invention increases the functionality of the housing by providing a partition inside the housing that partitions the signal generator storage area, the reception unit storage area, and the operating body storage area, thereby providing a small, inexpensive, and highly sensitive detector. That's what you're trying to get.

Hereinafter, this inventive detector will be described in detail according to embodiments.

FIG. 4 is an exploded perspective view of the ultrasonic intrusion detector. FIG. 5 is a partial sectional view thereof. 1 is the base, 2 is the cover, and the base 1 and cover 2 form the housing 3.
form. Reference numerals 4 and 5 denote partition walls, which divide the internal space 6 of the casing 3 formed by the base 1 and the cover 2 into a housing section 8 for the signal generating section 7, a housing section 10 for the receiving section 9, a volume controller serving as a sensitivity adjustment means, and a power source. switch 1
2. It is partitioned into an operation body storage section 16 that stores terminals 13, 13 for connecting external lead wires, operation bodies 14, 15 for operating the directivity adjustment means, and the like. The signal generator 7 is a printed board 1 housed and fixed on the back side of the base.
an ultrasonic vibration element 18 made of barium titanate driven by an oscillation circuit formed on 7;
and a receptor 19 that receives the ultrasonic vibration element 18.
It consists of

Similarly, the receiving section 9 is composed of an ultrasonic transducer 20 made of barium titanate and a receiver 21 thereof.

The operation housing 16 includes a volume 11 which is a sensitivity adjustment means for adjusting the amplitude of the ultrasonic transducer 18 and the degree of amplification of the electrical output of the ultrasonic transducer 20, a signal generator 7, and a receiver 9. Operating bodies 14 and 15 are provided for operating means for changing direction and adjusting directivity.

The signal generating section 7 and the receiving section 9 are connected by a core rod 22, holding frames 23, 23', and holding frames 24, 24', and the receivers 19, 21 of the ultrasonic transducers 18, 20
are engaged with the holding frames 23, 23', 24, 24', respectively. The operating body 14 is an operating body that moves or rotates the core rod 22 in the X direction, and the operating body 15 moves or rotates the core rod 22 in the Y direction.One end 14a, 15a is an operating body that moves or rotates the core rod 22 in the Y direction. It is a protruding operation part, and 14b and 15b are engaging parts with the core rod 22. One holding frame 23, 23'
The shaft portions 27, 27' are engaged with the recesses 29, 29' of the bearing bodies 28, 28' protruding from the base 1, and held by the springs 30, 30'.

The cover 2 is made of metal, and has through holes 31 and 3 in the parts that cover the signal generator housing part 8 and the receiving part housing part 10.
1'... are provided, and porous materials 32, 32' such as urethane foam are attached to the outer surfaces.
This cover 2 does not need to be made of metal, and may be formed of a molded product. 33 is a screw for attaching the cover 2 to the base 1, and 34 is an internal threaded portion provided on the base 1.

The outside of the partition walls 4 and 5 is formed so as to be in contact with the inside of the cover 2, and the base 1 and the cover 2 are connected to each other.
It may be formed separately from the base 1 or the cover 2, or may be formed integrally with either the base 1 or the cover 2.

Further, the material of the partition walls 4 and 5 may be the insulating material that is the material of the base 1, or may be a conductive metal body in the case of a radio wave type intrusion detector.

The ultrasonic vibrator 18 driven by the oscillation circuit generates a compression wave in the air around it at the same frequency as the oscillation circuit, and the compression wave of the air, that is, the ultrasonic wave, penetrates the hole 31 of the cover 2. , 31 to go outside.

This sound wave fills the detection area, enters the receiving section 9 through the hole 31 of the cover 2, vibrates the ultrasonic transducer 20, and the vibration of the transducer 20 extracts an electrical signal. If there is no moving object within the detection area, the ultrasonic waves emitted from the signal generator 7 and the ultrasonic waves incident on the receiver 9 have the same frequency, but if a moving object enters the detection area,
When the object moves toward or away from the object, the ultrasonic wave is received by the receiver 9 with a frequency slightly higher or lower than the frequency of the ultrasonic wave emitted from the signal generator 7 due to the Doppler effect. By identifying this frequency shift, it is possible to detect whether an object has entered the detection area.

Sensitivity is determined by the ratio of the sound wave components that are not affected by the Doppler effect to the sound waves that are affected by the Doppler effect due to objects, so in the case of a conventional example shown in Fig. 3, which has no partition wall at all, The sound waves that directly enter the receiver 9 from the signal generator 7, that is, the sound wave components that are not affected by the Doppler effect, increase.
Detection sensitivity decreases. In order to improve this, conventional measures were taken to increase the distance between the signal generator and receiver, which resulted in larger dimensions.
In this invention, by providing a partition wall, the sound wave component that directly enters the receiving section from the signal generating section is eliminated, so high sensitivity can be achieved despite the small size. In addition, in the case where only the part of the cover that covers the operation body storage section 16 is detachable, the signal generation section storage section 8 and the reception section storage section 10 are independently partitioned by the partition walls 4 and 5. Therefore, even if the cover of the operation body storage section 16 is opened, there is no difference from normal use, so when setting up this detector, when adjusting the directivity and sensitivity, it is necessary to attach the cover every time as before. Adjustment can be made under exactly the same conditions as in use without the need for turning on and off.

In addition, by arranging the signal generating section housing section 8 and the receiving section housing section 10 at both ends of the detector, the structure can be formed symmetrically, and the directivity adjustment means that adjusts the signal generating section 7 and the receiving section 9 in conjunction with each other. structure becomes easier to obtain.

As described above, according to the present invention, the detector having both the signal generating section and the receiving section inside the housing constituted by the cover and the base is arranged in the signal generating section housing 8, by the partition walls 4 and 5. Since it is structured to be partitioned into a receiver storage section 10 and an operating body storage section 16, a highly sensitive, compact and inexpensive detector can be obtained.

In addition, by making only the part of the cover that covers the operating body storage part 16 removable, when setting the detector,
It is convenient because it can be adjusted under exactly the same conditions as normal use, and without having to attach or remove the cover.

Further, a signal generator storage section 8 and a reception section storage section 10
When arranged at both ends of the detector, the structure of the directivity adjustment means for adjusting the directivity by interlocking the signal generating section 7 and the receiving section 9 can be simplified, and this is practically effective.

[Brief explanation of drawings]

1 to 3 are sectional views showing different conventional examples. 4 and 5 show an embodiment of the present invention, FIG. 4 being a perspective view with the cover removed, and FIG. 5 being a partial sectional view. 1...base, 2...cover, 3...casing,
4, 5...Partition wall, 7...Signal generation section, 8...Signal generation section storage section, 9...Reception section, 10...Reception section storage section, 16...Operation body storage section.

Claims (1)

[Claims] 1. In the internal space of the casing constituted by the base and the cover, there is a signal generating section such as light, radio waves, ultrasonic waves, etc., and a signal emitted from the signal generating section, which is generated by an object. In a detector that houses both a receiving section that receives a reflected signal, at least one of the signal generating section and/or the receiving section is disposed between the signal generating section housing section and the receiving section housing section. 1. A detector characterized in that an operating body storage section for operating a sensitivity adjustment means or a directivity adjustment means is partitioned off by a partition wall. 2. The detector according to claim 1, wherein the partition wall is formed integrally with either the base or the cover. 3. The detector according to claim 1, characterized in that the signal generating section housing section and the receiving section housing section are provided at both ends of the casing. 4. The detector according to claim 1, wherein the cover is detachable only at a portion that covers the operating body storage portion. 5. Claim 1, characterized in that the cover is provided with a hole through which signals such as light, radio waves, ultrasonic waves, etc. can pass, at a location that covers the signal generating section and the receiving section.
or the detector according to item 4.