JPH0251033A - Infrared detector - Google Patents

Abstract

PURPOSE:To realize correct measurement of temperature, etc. by providing an adjusting means in a driving circuit for adjusting a driving signal such that the amplitude of a vibrating body is restrained from changing in corresponding to the change of an environmental temperature. CONSTITUTION:A diode 50 and a transistor 52 constituting a stabilized power circuit 53 for a driving circuit 41 have a minus temperature between an emitter and a base thereof. Accordingly, an absolute value of an output voltage -Vc volt represents a negative temperature characteristic. In this case, the power circuit 53 together with an infrared detector 1 including vibrating bodies 24, 25 is present within the same casing 42. Therefore, the negative temperature characteristic of the absolute value of the output voltage -Vc volt in the power circuit 53 is substantially corresponding to the same environmental temperature as the vibrating bodies 24, 25. Accordingly, even when the environmental temperature changes and the absolute value of the output voltage -Vc volt changes, a temperature signal outputted from an output terminal 63 is constant. That is, although the amplitude of the vibrating bodies 24, 25 might vary, it is restricted before it happens. Therefore, the temperature measurement does not result in an incorrect value.

Description

DETAILED DESCRIPTION OF THE INVENTION A) Field of Industrial Application The present invention relates to a ninth infrared detection device that detects, for example, the temperature of a detected part based on infrared rays.

+7) Conventional technology 1!11 [N is an infrared detector of a conventional infrared detection device (
100). In such a detector (100), gold I
Il header (101) and infrared transmitting part (102)
The outer case (10
4) is provided with a focused ME type infrared detector (105) that generates a t charge by crystallizing the amount of change in the incident infrared rays, and a bulge mechanism that changes the infrared 411 incident on the detector. There are n. As shown in FIG. 12, the Jotsupa aS includes a pair of piezoelectric vibrators (106 (107)) and a pair of opposing bodies (108 (107) fixed to each end of the vibrator).
109). Such an opposing body (108), (
109) has a plurality of identical shapes each of which allows infrared rays to pass through,
Surin) (110λ(110)... of the same size is formed.

The vibrating bodies (106 and 107) move in mutually opposite directions (A or 8) based on a predetermined AC drive signal applied.
direction], thereby causing the opposing body (10
8) and (109), the relative positional relationship changes periodically,
The above pair (Surin of each of 108 people (109)) (
110), (110)... are overlapped and open, and the slit (110) of one opposing body (108) is
110) ... is the slit (
110) CIIQ)... The slits ( ] 10 bars 11 of each opposing body (108) (109) overlap with other parts
0)... is blocked repeatedly. Then, in the open rod, the infrared rays from the detected part are
104) infrared transmitting part (102) and both opposing bodies (10
8 people (109) Surin) (110)v (110)
... and enters the infrared detecting body (105), while in the upwardly obstructed state, the opposing body (108 people (109)
Only the infrared rays from the infrared rays enter the infrared detector (105), and the infrared rays from the infrared detector (105) enter the infrared rays! ! The amount changes periodically and generates a charge for measuring the temperature of the detected part, for example.

Now, in relation to the infrared detector (100), the vibrating body (106 (107)) is affected by the ambient temperature, and depending on the change in ambient temperature, the oscillating body (106) flexes in the direction A or B. , the amplitude value fluctuates during vibration.

Ilc! than the former! When this occurs, the relative positions of the opposing bodies (108) and (109) change from the desired state during non-vibration, and when vibration occurs,
Jio) (110)... cannot achieve the desired open/closed state. Also, when the amplitude value fluctuates like the latter,
Surin l” (110) (110
)... will not be able to achieve the desired open/closed state. When the desired open/closed state is no longer obtained, the amount of change in the infrared rays incident on the infrared detector (105) changes, and therefore, the amount of change in the infrared rays incident on the infrared detector (105) changes based on the change in ambient temperature. The amount of charge generated fluctuates, making accurate temperature measurements impossible.

The former deflection that occurs in response to changes in ambient temperature is caused by direct current flowing through both moving bodies (106) and (107) in response to changes in ambient temperature, as seen in Jikai@59.46826. By applying a bias signal, its occurrence is suppressed in advance, thus eliminating inaccuracies in temperature measurements due to such deflections.

However, a solution to the latter problem, in which the amplitude value fluctuates in response to changes in ambient temperature, resulting in inaccurate temperature measurement, has not yet been proposed.

c/) Problems to be Solved by the Invention The object of the present invention is to provide an infrared detection device that can completely prevent the amplitude value of a moving object from fluctuating due to changes in the surrounding area, and can perform accurate temperature measurement, etc. be.

2) Means for Solving the Problems The present invention provides an infrared detecting body that generates a charge depending on the amount of change in incident infrared light, and an infrared detecting body disposed in an infrared incident area to the detecting body.
A pair of opposing bodies having an infrared passing section and an infrared detecting section both M, and a characteristic that a=tV loss width value due to application of a drive signal varies according to changes in ambient temperature, In the infrared detection device, the infrared detection device includes a vibrating body that periodically changes the relative position gt relationship between In order to suppress fluctuations depending on
The present invention is characterized in that it has an adjusting means for adjusting the magnitude of the drive a'@.

(e) When the ambient temperature changes, the voltage applied to the vibrating body changes accordingly.
The driving flaw signal O size is adjusted, and the Inl of the ffl moving object is adjusted.
Fluctuations in lMfIL in response to changes in ambient temperature are suppressed.

(F) Embodiment FIGS. 1 and 2 show an infrared detector (1) t- in an infrared detecting device according to an embodiment of the present invention. In such a detector (1), a metal header (2J) and an infrared transmission filter (
Inside the outer case (6) consisting of a cap (5) having an fL-order infrared entrance port (4) closed at It is arranged.

In the infrared detection section (7), front and back electrodes (9)
A pyrotlE type infrared detector συ made of tantalum acid tcum (LIT Hatake 03) single crystal which has α, [) and generates a charge according to the amount of change in incident infrared rays is provided.The n15 detector is made of phosphor bronze etc. The infrared detector αV is fixed in contact with a metal backing stand α consisting of a conductive adhesive σJ.The infrared detector αV is shielded from external noise by a shield αS having an infrared incidence opening σ4I. Further, the front surface electrode (9) is connected to the header (2) via an insulating material and connected to the impedance conversion circuit (described later) through the nine signal terminal decoys. The electric power is electrically connected to the ground terminal αη via the contacting agent αJ1 and the header (2).

Next, in the chopper mechanism section (8), the infrared ray incident area of the detection object (ill-), that is, between the detection object σD and the opening (4), is arranged parallel to each other and n7 is a plane. A pair of eleventh second opposing bodies +11M9 are located in the shape of a shape.As shown in FIGS. The infrared ray passing portions (a) and c!!il as a plurality of extending slits are shaped like bottom holes, and the infrared ray non-passing portions 33 are located between each of the passing portions.

The above-mentioned passing part (2), C1l, and non-passing part (2) have the same dimensions and shape, and the widths wl and W2 are k 100 sin,
200 sWJteh;b.

The above-mentioned 11g1, second rotating bodies αδ and α9Vi are fixed to the right ends of the first and second vibrating bodies 14, respectively.

Part 1. Section 2 The configuration of the vibrator is shown in detail in Figure 4.

There is a central wL pole (to), @ made of phosphor bronze, etc., and on both sides of each of the central electrodes there is a single direction (arrow p) made of baricum titanate, zirconium-containing titanium reformed lead, etc. Polarized piezoelectric bodies (1), (4) are provided so that their polarization directions are the same, and on the outer surface of each piezoelectric body (2), a surface electrode (7) made of silver or the like, C. (I
) is sugitori.

The 1% second vibrating body-1 is a metal first vibrator fixed on the header (2) via an insulating layer. Second fixed base (
It is clamped and fixed at (g) and (b). In this case, the surface electrode C311 electrically contacts the M1, the second fixed stage, and the pulley. The center of the first protein C24+ is connected to the pole and the second fixing base (B) is connected to the header (2).
) through an insulating material, and is connected to the terminal (to) of the second transmission body through an insulating material;
The fixing base C33 is connected to a second loss terminal which is similarly implanted in the header (2) via an insulating material.

Therefore, a potential difference between +V volts (the voltage of the first vibrating terminal is higher than that of the second WR dynamic terminal) and - is applied as a drive signal between M1 and the second vibrating terminal (to). ■ A signal of volts (the voltage is higher at the second vibrating terminal than at the first loss terminal) is applied periodically (frequency 3 Hz) and to each other repeatedly. In the case of the latter potential difference, The above-mentioned culvert (
In 241, the lower piezoelectric body 124 contracts, and the upper piezoelectric body extends.
1 is deflected in the direction of arrow EiJ. In addition, in the second attacking body 4, the lower piezoelectric body expands and the upper piezoelectric weight contracts, so that the second S@ body bends in eight directions. On the other hand, in the case of the former difference of 1 place, the 1st, i2! jK21 bodies c! 41.1
251 is for my husband! Knee n reverse ica, flexing towards A.

From this AK, the 11th second vibrating body and the west vibrate periodically in opposite directions, and based on this impression, the relative position of the 11th second opposing body a8, α] is displaced. However, the infrared passing portions of the bireflective body ff811 (19 infrared passing portions ■, 211 are N and open, and the infrared passing portion of the first opposing body a8 overlaps with the infrared non-passing portion of the second opposing body (19) The state in which the infrared rays non-passing portion of the first opposing body 9 overlaps with the infrared ray passing portion (211) of the second opposing body 9 and is occluded is periodically repeated. Then, the infrared detector a1 passes through the filter (3) and enters the outer case (6).

The amount of incident infrared rays changes based on the infrared rays coming from the object to be detected and the infrared rays from the opposing object. The body C111 corresponds to the Oa degree difference with C9 and outputs a ratio signal.

The outer case (6) further has a built-in diode (18, temperature measuring diode C37) for detecting the temperature of C9. The 7 nodes of the diode are connected to the header (
2) Injected diode terminal (7) via insulating material
The n1 cand connected to n is grounded.

FIG. 5 shows the structure of an infrared detection device including the infrared detector (11), and the infrared detector il+ is fixed to the printed circuit board C' through its respective terminals.

The above-mentioned infrared detector (11) is mounted on such a printed circuit board (support).
A temperature circuit 14G that receives a temperature signal from the vibrating body c! A driving circuit I is provided which outputs color codes of periodic potentials ++■ volts and -■ volts as drive signals for the 4I timer. And the infrared detector il
A fixed-nth printed circuit board is placed inside a box (43).

The sixth factor shows the circuit of the infrared detection device including the above-mentioned infrared detector tilt. Between the surfaces of the infrared detector συ 41i1
t93 is placed in the shield body 15i together with the infrared detector συ and connected to the impedance f conversion circuit +43. The conversion circuit has an input resistance field of 1010-1011Ω, F'ETfθ, and an output resistance (48
The source of the FET 45 is connected to the west of the signal terminal n1, and the drain is connected to the current voltage application terminal a terminal t47).

Therefore, between the first and second vibration terminals Shikoku, there is a voltage of ±V volts from the drive circuit circle as a JEK frequency! ! !
A phase difference signal (Fig. C) is applied alternately.

That is, in the drive circuit (4I), a pulse P of frequency 3F (low level (-7 volts) at Z) is sent from the excavator 08.
is output (Figure 7b). On the other hand, Zener diode +
4! A stabilized power supply circuit @ consisting of J, diode ω, transistor 6υ63, etc. is connected to −V via switch 541Th.
By reducing the voltage of DD (approximately -40 volts), a voltage of -Vc volts is generated (Section 7 (2) a). At this time, when the pulse P is output, the transistor turns on, and the next transistor ω also turns on, which causes the chestnut
O volts are applied to the S terminal 4, and -Vc volts are applied to the second oscillating terminal. , in short, all, the second
A differential signal of +V volts is applied between the vibrating terminals. Also, while the pulse P is not output, the transistor 6
9 is turned off, and the transistor (56) is also turned off, so that -Vc volts and O volts are applied to the 11th and 2nd terminals (G), respectively.
Second vibration terminal field c! A stopping difference Ig of 1 volt is applied between a and n.

As a result, when a potential difference signal of ±V volts is alternately applied between the above-mentioned terminal and the second pulsating terminal ω, the 11th WJ2 moving body prisoner leaves work as described above, and thus When S is open, a ratio signal is output from the signal terminal αe to the outside of the detector 11 through the impedance conversion circuit 143 in accordance with the temperature difference between the object to be detected and the opposing body, αj. Such a signal actually forms an alternating current e as in the seventh case d, and its amplitude becomes t in accordance with the above-mentioned temperature difference. Thus derived n7?1. The signal then goes to the temperature circuit 3G and is input to the synchronous detector via the filter amplifier εη.

Such a detector (to) detects the AC signal e and the oscillator 38.
The sound is synchronized with the output of the object to be detected, and the temperature of the object is
If the temperature of the object to be detected is higher than the temperature of the object 9, a DC signal of specific pressure is detected and output according to the temperature difference, and the temperature of the object to be detected is
If the temperature is lower than the temperature, a negative [a signal is detected and output according to the temperature difference. That is, as for the above AC signal e, the temperature force 1 of the object to be detected 1 is greater than the temperature of the opposing body ab, σ, and the positive half tickle e+ coincides with the portion corresponding to the potential difference +V volts of the output of the excavator (481). If the temperature of the object to be detected is lower than the temperature of the opposing body (11), the negative half cycle - corresponds to the portion corresponding to the potential difference +V volts of the oscillator bright output.

Then, the t* wave generator 58 outputs a positive DC signal corresponding to the temperature difference between the object to be detected and the object ff&1α9 when the former matches, and when the latter matches. A negative DC signal corresponding to the degree difference is output.

The output from the detector (g) is input to the synthesis port via a DC amplifier. The synthesis circuit further includes the output from the temperature measuring diode c37), that is, the opposing body U1.
Depending on the temperature of α9, the ratio signal is DC amplifier 6υ? Through human power. And is the above synthesis circuit phrase these two inputs?
A ratio signal is output according to the actual temperature of the object to be detected.

The output is outputted from the output terminal through the DC amplifier ti3 to the outside of the box and inputted to the control circuit t641 including the microcomputer n1.

The control circuit performs each right y4 based on the input a degree q in this way. For example, in a microwave oven, the above temperature I! 1. Control the 77D heat based on the signal.

Further, when inputting this temperature signal, the control circuit causes the excavator (481) to start rooting in advance and turns on the switch (5411t).

Now, the above-mentioned 1% second possessed body LJ414 is made up of Oden body pilgrims, etc., and as shown in Section 8 (2), there is a special order in which the amplitude value of the above-mentioned periodic vibration changes according to changes in the ambient temperature. Specifically, there is a positive temperature characteristic in which the amplitude value increases as the ambient temperature rises. When the amplitude value fluctuates like this,
Until this 't', as shown in FIG.
．． The temperature signal outputted from the output terminal 1 corresponding to the difference signal ±V volts applied to the second vibrating terminal C is the temperature signal outputted from the output terminal 1, which corresponds to the difference signal ±V volts. U @ fluctuates according to changes in degrees. Specifically, the absolute value of the output voltage -Vc volts is VpC
-30 pol)), dL, IIS ambient temperature is 5℃
, 25℃, 60℃ (if C changes, m degree Δ is RT
s, RTzs, 11 (change 1 to T6o. Therefore, te, pN
The 11A degree changes, and the 11th and 2nd fiendish body CG (To)!
Fluctuations in the temperature range result in inaccurate temperature measurements.

Here, in the embodiment of the present invention, the drive circuit (41)
Stabilized power supply I! ! I connection 63 all 63 all configuration iodes 6α
And the emitter-base of the transistor 6z has a negative temperature characteristic (1), so that the absolute i of the output voltage -Vc volts becomes a negative temperature I! as shown in No. 10 (2). We have a custom order. In this case, the stabilizing power supply circuit 64 serves as the bottom of the upper drive vJ circuit Aυ. N1 Joki 1st, M2 vibrator 1 #f251 arranged at the end of the printed circuit board.
It is present in the same box together with the infrared detector (11) containing the
The negative temperature customization of the absolute value of Vc volts means that the first and second protein bodies correspond to the ambient temperature that is qualitatively the same as (c).
k, there.

Therefore, when the ambient temperature S changes to 5°C, 25°C, and 60°C, the absolute value of the output voltage -Vc volts becomes Vpl, V
p, Vp-. So, in comparison with FIG. 9, when the ambient temperature changes, the absolute one voltage of the output voltage -Vc volts is Vpl, Vp.

Even if Vpl fluctuates, the temperature signal output from the output terminal 6312) remains constant at RTzs, and
This indicates that fluctuations in the amplitude value of the immobile body @6 are suppressed in advance. Therefore, the temperature measurement will not be inaccurate.

Here, a diode ω and a transistor (52) in the stabilizing power supply circuit of the drive circuit f41) are used to suppress fluctuations in the amplitude value of the eleventh second vibrating body [241] according to changes in ambient temperature. It adjusts the drive signal from the drive circuit CD, and corresponds to the adjustment means of the present invention.

In addition, in the X real i column, the above 1. Second vibrating body c! 4I
11 If the fluctuation of the amplitude of ca with respect to the temperature is larger, for example, if the Zener die in the stabilized power supply four-way Q is
It is sufficient to specify a negative temperature characteristic for a. Conversely, if it is small, for example, the diode ω should not have a negative temperature characteristic, or the Zener diode 4 should have a positive temperature characteristic.
All you have to do is t-fF*.

(Effects of the Invention According to the present invention, the amplitude value of the vibrating body does not fluctuate even if the ambient temperature changes, so that accurate measurements can be carried out.

[Brief explanation of the drawing]

1 to 10 show an embodiment of the invention, FIG. 1 is a perspective view of an infrared detector, FIG. 2 is an Ifr side view of the infrared detector, and FIGS. A plan view of two pairs of bodies! 44 is a plan view of the main part of the infrared detector, Fig. 5 is a perspective view of the infrared detection device, Fig. 6 is the same circuit diagram, Fig. 7 is a signal waveform diagram, and Fig. 8 is the characteristic of amplitude value with respect to ambient temperature. 9 is a cross-sectional view of the infrared detector showing one pressure value L-Val, and FIG. 12 is a plan view of the main part thereof. (11)... Infrared detector, αa e a3... First and second antiisomer, ■, r211... Infrared passing section, r23... Infrared non-passing section, C4J, solid...・First
1 second vibrating body, (4υ... drive circuit.

Claims (1)

[Claims] (1) An infrared detecting body that generates a charge according to the amount of change in incident infrared rays, a pair of opposing bodies that are arranged in the infrared incident area to the detecting body and have both an infrared passing part and an infrared non-passing part, and a drive signal. a vibrating body that has a characteristic that the amplitude value of vibration caused by the application of oscillation changes in response to changes in ambient temperature, and periodically changes the relative positional relationship between the pair of opposing bodies; and a drive circuit that outputs the drive signal. In the infrared detection device, the drive circuit includes adjusting means for adjusting the magnitude of the drive signal so as to suppress the amplitude value of the vibrating body from changing in accordance with changes in the ambient temperature. An infrared detection device comprising: