JP3373680B2 - How to set the optical axis of the infrared detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a plurality of light emitting portions.
And receive the infrared beam sent from the projector
Type with a plurality of light receiving parts
In the detector, the optical axis of each light emitting part and light receiving part
For setting the optical axis of an infrared detector
It is. [0002] 2. Description of the Related Art Conventionally, one infrared beam is opposed to an infrared beam.
With the intruder moving between the sender and receiver.
Output of the receiver when the infrared beam is blocked
The intruder is detected and an alarm is issued.
Detection that outputs a detection signal for
Vessel is used. However, when the above detector is installed outdoors,
Small birds, leaves, etc.
May block the infrared beam.
This often resulted in malfunctions. So, this
In order to avoid such a malfunction as shown in FIG.
A loose double beam infrared detector is provided.
You. This infrared detector is one that sends out an infrared beam.
A projector 1 'having a pair of projectors 2a and 2b,
Equipped with a pair of light receiving parts 11a and 11b for receiving a linear beam
Light receiving units 10 ′, and the light emitting units 2 a and 2
b and the light receiving sections 11a, 11b
The optical axes are substantially aligned so that light is emitted, and the
An optical device 10 'is arranged opposite to the optical device. In addition, two infrared
The distance between the beams is about 20 cm. This infrared inspection
The detector detects even if one infrared beam is interrupted.
Output signal, and the two receivers 10 '
The infrared beams received by the light units 11a and 11b are the same.
To output a detection signal for the first time when interrupted
I have. For this reason, small birds and leaves
If the infrared beam is blocked, a malfunction may occur.
To prevent kinking. FIG. 5 is a schematic circuit block diagram of the above-mentioned light receiver 10 '.
It is a lock figure. In this light receiver 10 ′, each light receiving unit 11
a, an output corresponding to the amount of light received by 11b
2₁, 12_TwoAfter each amplification by the amplified output
Is processed in the processing circuit unit 13. In the processing circuit unit 13
Is the preamplifier 12₁, 12_TwoWith the outputs of
C filter 14₁, 14_TwoDue to disturbances such as sunlight
Noise is removed and the bandpass amplifier 15₁, 15_TwoTo
Frequency corresponding to the infrared beam from the projector 1 '
And selectively amplifies only the signal of
To detect the output corresponding to the infrared beam and
Two infrared beams simultaneously when the wave output is less than the specified value
And outputs the detection signal
You. Note that the bandpass amplifier 15₁, 15_TwoAnd the input end of
An automatic gain control circuit (AGC) 17 is provided between the
There is. [0005] By the way, the double
In the beam type infrared detector, the projector 1 '
When installing the light receiver 10 ′, the respective optical axes almost coincide with each other.
I have to keep it. To do this, first,
For example, the light projecting unit 2a and the light receiving unit 11 in the upper part of FIG.
a is shielded from light using a light-shielding plate (not shown),
(Lower stage in FIG. 2) only the light projecting portion 2b and the light receiving portion 11b
A light beam is emitted and received, and a predetermined
Operate the projector 1 'and the receiver 10' so that an output can be obtained.
Thus, the optical axis is adjusted. Next, the opposite light emitting portion 2b and
The light receiving portion 11b is shielded from light by a light shielding plate, and the optical axis is adjusted in the same manner.
By doing so, each of the light projecting units 2a, 2b and the light receiving units 11a,
The optical axis was set so as to substantially coincide with the optical axis of 11b. However, in the above setting method, the optical axis
Adjustment of the light emitting units 2a and 2b and the light receiving units 11a and 11b
There is no problem if it is performed reliably in the combination of
However, due to the detection method, for example, one of the light projecting unit 2a and the light receiving unit 1
Even when only the optical axis of 1a substantially matches,
The detection signal is generated only by blocking the infrared beam
It is output, can you take advantage of the double beam method?
Therefore, the above malfunction cannot be prevented. example
In this case, the light axes of the light projecting portion 2b and the light receiving portion 11b substantially coincide with each other.
If the construction is completed without performing the
The optical device 10 'is brought into the detectable operating state as it is.
And there is a risk of malfunction. Ma
In addition, a light shielding plate must be used to adjust the optical axis.
There is also a problem that it takes time. [0007] The present invention has been made in view of the above problems.
Easy to adjust the optical axis and prevent malfunction due to construction mistakes
To provide a method for setting the optical axis of infrared detectors that can be stopped
Is what you do. [0008] The present invention achieves the above object.
In order to achieve this, multiple
The optical axis of each of the built-in light emitters and multiple light-emitting parts is approximately the same.
Multiple infrared receivers to receive each infrared beam
Equipped with a receiver, and multiple infrared beams
Infrared detector that outputs a detection signal when it is shut off
The optical axis setting method according to claim 1, wherein the plurality of
The infrared beam is sent from the
The light emitting part that sends out the beam should be approximately aligned with the optical axis
Operate only the light-receiving part, and if the output of the light-receiving part is
Adjust the optical axis of the light emitting part and light receiving part so that all light
Emitter only when the optical axis adjustment is completed between the
And put the receiver in an operating state that can be detected.
You. [0009] According to the above arrangement, a plurality of projectors provided in the projector are provided.
An infrared beam is sent out from the optical
The optical axis should be approximately aligned with the light projecting part that is sending out the linear beam.
Only the light receiving part is activated, and the output of the light receiving part is
Adjust the optical axes of the light-emitting unit and light-receiving unit so that
Emits light only when the optical axis has been adjusted between the light unit and light receiving unit
The receiver and receiver to be in an operating state that can be detected?
However, even if there is at least one light emitting unit and light
Is in an operating state that the infrared detector can detect.
Not be able to prevent malfunctions caused by construction errors.
In addition, there is no need to use a light shield plate as in the past, so the optical axis can be adjusted
Can be easily performed. [0010] 【Example】 (Embodiment 1) FIG. 1 is a photodetector of an infrared detector according to this embodiment.
FIG. In this embodiment, each receiving
Preamplifier 1 for amplifying the received light output of optical units 11a and 11b
2₁, 12_TwoBetween the switch and the processing circuit unit 13
W₁, SW_TwoAre provided, and the projector 1 and the processing circuit unit 1 are provided.
For other configurations including 3
The description is omitted because it is common with the infrared type infrared detector. Generally, the setting of the optical axis is performed by the projector 1 and the receiver.
At the time of construction to install 10, perform as initial adjustment
Things. Therefore, in this embodiment, the optical axis setting is
It is performed automatically when the power of the detector 1 and the receiver 10 is turned on.
I'm trying. This includes, for example, the projector 1 and the receiver 10
Microcomputer for control (not shown)
And perform it as an initialization operation when the power is turned on.
I just need to make it. In addition, besides this, setting the optical axis
A dedicated set switch (not shown) is provided for
The optical axis setting is performed when the switch is operated.
You may do it. Next, based on the flowchart shown in FIG.
The setting method of the optical axis in the infrared detector having the above configuration
Will be described. Power on the projector 1 and the receiver 10
When it enters (step 1), an infrared beam is emitted from the projector 1.
Send, switch SW of light receiver 10₁On, switch
SW_TwoIs turned off (step 2). As a result,
Only the light receiving output of the light receiving section 11a is₁Through
And input to the processing circuit unit 13. That is,
The light receiving part 11b at the lower stage of the optical device 10 was shielded by the light shielding plate.
Will be the same as In this state, the upper light emitting section 2a and the receiving
The optical axis of the optical unit 11a is adjusted (step 3),
So that the signal level in the road section 13 becomes a predetermined value or more.
(Step 4). Thereby, the upper light emitting portion 2a
The optical axis of the light receiving section 11a can be substantially coincident with the optical axis of the light receiving section 11a.
When the optical axis adjustment is completed, the upper light-emitting unit 2a of the light projector 1 is
The light emitting state is set (step 5). Then, the switch SW of the light receiver 10₁To
OFF, switch SW_TwoIs turned on (step 6), and the lower row
Only the light receiving output of the light receiving section 11b is_TwoThrough
This state is input to the processing circuit unit 13,
Similarly, the optical axes of the lower projecting portion 2b and the light receiving portion 11b
Is adjusted (step 7), and the processing circuit unit 13
Make the signal level equal to or higher than the predetermined value (step
8). As a result, the lower light emitting unit 2b and the light receiving unit 11b
Optical axes can be made to substantially coincide, and the lower optical axis adjustment is completed.
When the setting is completed, the light emitting part 2b at the lower stage of the light emitter 1 is set to the light emitting state.
(Step 9). As described above, the upper and lower light
Adjustment of the optical axis between the parts 2a and 2b and the light receiving parts 11a and 11b
When completed, two switches SW₁, SW_TwoTogether
And set the infrared detector to an operating state that allows detection.
(Step 10), set to the alert state to detect an intruder
(Step 11). According to the above method, the light receiving section of the light receiver 10
The optical axis adjustment is performed by shielding the circuits 11a and 11b from light in a circuit.
Therefore, the optical axis can be adjusted without using a light shielding plate.
Also, two sets of light emitting units 2a and 2b and light receiving units 11a and 11b
Only after adjusting the optical axis of the
Because it is in the working state, either one at the time of construction
However, the light emitting units 2a and 2b and the light receiving unit 11 whose optical axes do not substantially coincide with each other
a and 11b are detected by the infrared detector.
Operational state is not noticeable and malfunction due to construction error
You can prevent life. (Embodiment 2) FIG. 3 shows an infrared detector of this embodiment.
FIG. 2 is a diagram showing a schematic configuration of an alarm, and in a basic configuration thereof;
Is the conventional and double beam type infrared detection of the first embodiment
And the common parts are denoted by the same reference numerals.
Description is omitted. As shown in FIG. 3, the projector 1 has a pair of
Light emitting diode LED₁, LED_TwoIs the light emission drive circuit
3 in series, and furthermore, each light emitting diode LE
D₁, LED _TwoSwitch SW in parallel with₁’, SW_Two'When
Resistance R₁, R_TwoConnected in series.
You. In addition, light emitting diode LED₁, LED_TwoIs the light emitting part
2a and 2b. And a light emitting diode LED₁,
LED_TwoThe infrared beam emitted from the
The light is then transmitted to the light receiver 10. On the other hand, the infrared receiver 10 receives each infrared beam.
A lens 18 for condensing light on the light units 11a and 11b is provided.
ing. The light receiving outputs of the light receiving units 11a and 11b are
Re-amp 12₁, 12_TwoAfter each amplification at
The two infrared beams are sent to the
Output a detection signal only when
It has become. In this embodiment, the pre-a
Pump 12₁, 12_TwoBetween the circuit and the processing circuit unit 13
SW₁, SW_TwoAre provided respectively. Next, in the infrared detector having the above configuration,
A method for setting the optical axis will be described. First, the same as in the first embodiment
When the power of the light emitter 1 and the light receiver 10 is turned on, the light
Switch SW of vessel 1₁’Is on, switch SW_Two’Is oh
And the switch SW of the light receiver 10₁Is on, switch
SW_TwoIs turned off. Here, the power supply of the projector 1 is
Closing and switch SW₁’, SW_Two’On / off operation
Is connected to the light receiver 1 by a wired or wireless remote control signal.
0 switch SW₁, SW_TwoIn sync with turning on / off
Remote control, which is well known in the art.
Can be realized. Switch SW of projector 1₁’On, sui
Switch_Two′ Is turned off, the two light emitting diodes L
ED₁, LED_TwoOf the upper light emitting diode LED₁
Only emits light. Also, the switch SW of the light receiver 10₁To
ON, switch SW_TwoIs turned off, the upper light receiving section 1
Only the light receiving output of 1a is the preamplifier 12₁Processed through times
This will be input to the road section 13. That is, the floodlight 1
Only one infrared beam is transmitted from the
In addition, in the light receiving portion 11b at the lower stage of the light receiver 10,
The disturbance noise is not input to the processing circuit unit 13. Yo
In this state, the light of the upper projecting portion 2a and the light receiving portion 11a is
The axis is adjusted, and the signal level in the processing circuit unit 13 is adjusted.
It should be more than a predetermined value. This allows the upper stage
It is possible to make the optical axes of the portion 2a and the light receiving portion 11a substantially coincide with each other.
Wear. Similarly, the switch SW of the projector 1₁’
F, switch SW_Two’On, two light emitting dies
Aether LED₁, LED_TwoOf the lower light emitting diodes
LED_TwoOnly emits light. Also, the switch of the light receiver 10
SW₁Off, switch SW_TwoIf you turn on, the lower row
Only the light receiving output of the light receiving section 11b is₁Through
And input to the processing circuit unit 13. Therefore,
In the state described above, the adjustment of the optical axis of the lower projecting portion 2b and the light receiving portion 11b is performed.
And the signal level in the processing circuit unit 13 becomes a predetermined value.
So that As a result, the lower light emitting section 2b
And the optical axis of the light receiving portion 11b can be also substantially matched. In this manner, the optical axes of the upper and lower stages are adjusted.
Is completed, and when they substantially coincide with each other, the switch S
W₁’, SW_Two’Is turned off.
Switch SW of vessel 10₁, SW_TwoTurn on each
As a result, two infrared rays are transmitted from the projector 1 to the receiver 10.
Is sent and the infrared detector can be detected.
Is set to According to the above-mentioned method, the ratio is different from that of the first embodiment.
In comparison, the light emitting units 2a and 2b of the light projector 1
Since the infrared beam was radiated by itself, the photodetector 1
Light emission of the non-paired light receiving units 11a and 11b
Completely affected by the infrared beams from the sections 2a and 2b.
Therefore, the optical axes can be approximately matched more accurately. What
In the first and second embodiments, the infrared rays
Explanation of the double beam system that sends out two beams
However, an infrared detector using three or more infrared beams
The technical idea of the present invention can be applied to the optical axis setting of
Needless to say, this is possible. [0021] According to the present invention, there is provided a floodlight for transmitting an infrared beam.
A plurality of projectors, and a plurality of
Multiple to align each axis to receive each infrared beam
And a plurality of infrared receivers.
Infrared that outputs a detection signal when the camera is shut off at the same time
An optical axis setting method for a linear detector, provided in a projector.
In addition to transmitting infrared beams sequentially from multiple light emitting units,
And the optical axis is almost the same as the light emitting part that sends out the infrared beam
Operate only the light receiving section to be operated, and
Adjust the optical axis of the light emitting part and light receiving part so that
When the adjustment of the optical axis has been completed for all the emitters and receivers
Only the sender and receiver can be detected.
And the light-emitting part and the light
When an infrared detector is
Prevents malfunction due to construction mistakes
And it is not necessary to use a light shielding plate as in the past.
There is an effect that the optical axis can be easily adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram illustrating a light receiver according to a first embodiment. FIG. 2 is a flowchart for explaining an optical axis setting method according to the first embodiment. FIG. 3 is a schematic block diagram showing a second embodiment. FIG. 4 is a schematic configuration diagram showing a conventional example. FIG. 5 is a circuit block diagram of the light receiver in the above. [EXPLANATION OF SYMBOLS] 1 projector 2a, 2b projecting portion 10 light receiver 11a, 11b light receiving portion SW _1, SW ₂ switch SW ₁ ', SW _2' switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G08B 13/183 H03K 17/78

Claims (1)

(57) [Claim 1] A light projector having a plurality of light projecting units for transmitting an infrared beam, and a light projecting unit for receiving each of the infrared beams by making the optical axes of the light projecting units substantially coincide with each other. An optical axis setting method for an infrared detector that outputs a detection signal when a plurality of infrared beams are simultaneously cut off, comprising a plurality of light receivers. An infrared beam is sequentially transmitted from the light emitting section, and only the light receiving section whose optical axis is to be substantially coincident with the light emitting section which is sending the infrared beam is operated, so that the output of the light receiving section becomes a predetermined value or more. The optical axes of the light unit and the light receiving unit are adjusted, and the operation state is such that the light emitting unit and the light receiving unit can be detected only when the adjustment of the optical axis is completed in all the light emitting units and the light receiving units. How to set the optical axis of the infrared detector.