JP2551249Y2 - Pyroelectric device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a pyroelectric film, a first electrode provided on one surface of the pyroelectric film, and a first electrode provided on the other surface of the pyroelectric film. Two electrodes, wherein the first electrode comprises a plurality of electrodes, each of the plurality of first electrodes being provided with an electrode body for providing an effective light receiving electrode area, and another electric circuit. And a terminal portion integrally formed with the electrode body, and the second electrode faces the electrode body of the first electrode and has an effective light receiving electrode area. Having at least an electrode body for providing said first and second electrodes;
Regarding a pyroelectric device in which a plurality of unit pyroelectric elements are constituted by the pyroelectric film interposed between the first and second electrodes, and particularly to an electrode structure thereof, the pyroelectric device is This is suitable for use in a pyroelectric infrared sensor.

[0002]

2. Description of the Related Art A pyroelectric infrared sensor for detecting an intruder used in the fields of security and automatic doors is required to have high reliability. Various researches and developments have been made on sensors. For example, U.S. Pat. No. 3,839,640 discloses that a pair of unit pyroelectric elements are connected in series or in parallel so that their polarities are opposite to each other to form a pyroelectric element. There is disclosed a pyroelectric element device in which a defect that is erroneously detected due to a change in room temperature or the incidence of disturbance light is improved. Also, JP-A-61-1755
No. 83, Japanese Unexamined Utility Model Publication No. 58-32337 and European Patent Publication No. 131996, as shown in FIGS. 1 (A), 2 (A) and 3 (A) in the accompanying drawings of the present application, respectively. Discloses an electrode structure of a pyroelectric device comprising the above-described pyroelectric element.

Next, the electrode structure of the pyroelectric element device including the anti-pyroelectric element shown in FIGS. 1A, 2A and 3A will be described. In these drawings, parts corresponding to each other are denoted by the same reference numerals.

In these figures, reference numeral 1 denotes a pyroelectric film,
Reference numerals 2 and 3 are surface electrodes formed on the surface of the pyroelectric film 1. These electrodes 2 and 3 are provided with electrode main bodies 2a and 3a for providing an effective light receiving electrode area, lead portions 2b and 3b drawn out from these electrode main bodies 2a and 3a and extending, and these lead portions. 2b, 3b, and terminal portions 2c, 3c. Reference numerals 4 and 5 denote back electrodes formed on the back surface of the pyroelectric film 1. These electrodes 4 and 5 are provided with electrode main bodies 4a and 5a for providing an effective light receiving electrode area, lead portions 4b and 5b drawn out and extending from the electrode main bodies 4a and 5a, and these lead portions. 4b, 5b, and terminal portions 4c, 5c. The electrodes 2 and 3 are arranged point-symmetrically on the surface of the pyroelectric film 1, and the electrodes 4 and 5 are
Are arranged point-symmetrically on the back surface of the. And electrode 2
And 3 and the electrodes 4 and 5 are arranged so as to have the same shape on both sides of the pyroelectric film 1.

Therefore, the first unit pyroelectric element is constituted by the electrode 2, the electrode 4, and the portion of the pyroelectric film 1 interposed between the electrodes 2 and 4.
The electrode 3, the electrode 5, and the portion of the pyroelectric film 1 interposed between these electrodes 3 and 5 form the second
Are constituted. And these first
By connecting the second pyroelectric element and the second unit pyroelectric element in series or in parallel such that their polarities are opposite to each other, a pyroelectric element is configured. For example, these first
And the second unit pyroelectric element are connected in parallel such that their polarities are opposite to each other,
b, a terminal portion 2c composed of the tip of
The terminal portion 5c constituted by the tip portion of b is electrically connected to a common lead wire (not shown). Then, a terminal portion 3c constituted by a tip portion of the drawer portion 3b
And a terminal portion 4c constituted by a tip portion of the drawer portion 4b
Is electrically connected to another common lead wire (not shown) as in the case of the terminal portions 2c and 5c described above.

[0006]

[Problem to be solved by the invention] As described above,
Despite much research and development on a pyroelectric device comprising a pair of first and second unit pyroelectric elements, the pyroelectric element is composed of such a pyroelectric element. When a pyroelectric infrared sensor is actually manufactured using the pyroelectric device technology, a sensor having excellent electrical characteristics against disturbance light as expected is not necessarily obtained.
Further, there are variations in the electrical characteristics with respect to the disturbance light among the manufacturing lots.

The above points will be described in more detail.
In order to prevent erroneous detection of disturbance light from occurring in a pyroelectric element constituted by connecting the second unit pyroelectric elements in series or parallel so that their polarities are opposite to each other, , The first and second unit pyroelectric elements must have the same electrical characteristics with respect to disturbance light. More specifically, these first
When the second unit pyroelectric element and the second unit pyroelectric element are connected in anti-parallel, when the infrared light, which is disturbance light, is simultaneously incident on the two unit pyroelectric elements, the amounts of charges generated by these two unit pyroelectric elements are mutually different. When connected in anti-series, it is necessary that when infrared light is simultaneously incident on the two unit pyroelectric elements, the generated potentials of these two unit pyroelectric elements are equal to each other. is there.

However, the actually manufactured pyroelectric element is:
Even if the variations in the thickness, the dielectric constant and the pyroelectric coefficient of these two unit pyroelectric elements were reduced, the electrical characteristics against disturbance light alone were not improved.

As a result of intensive investigation and examination of the cause, the present inventor has found that the mechanical accuracy during normal manufacturing is different from the pattern of the front electrode and the pattern of the back electrode formed on both the front and back surfaces of the pyroelectric film. Are found to be different from each other, and as a result, the effective light receiving electrode area is different between the unit pyroelectric elements.

Next, this development will be further described with reference to FIGS. 1A to 3B for a pyroelectric device having a conventional electrode structure.

FIGS. 1A, 2A and 3A
In the pyroelectric element device shown in FIG. 1, the pattern of the front surface electrodes 2 and 3 of the pyroelectric film 1 and the pattern of the back electrodes 4 and 5 on the back side are slightly displaced from each other in the vertical and horizontal directions. (B), FIG. 2 (B) and FIG. 3 (B). 1 (B) and FIG.
In FIG. 3B and FIG. 3B, illustration of the pyroelectric film 1 is omitted. The hatched portions 7a and 7b are
The overlapping portions of the electrodes 2 and 4 and the overlapping portions of the electrodes 3 and 5 are shown. And the arrow
The lead portions 2b, 3b, 4b, and 5b are the respective electrode main bodies 2a,
3A, 3A, 4A, and 5A show directions in which each of them is drawn out and starts to extend.

In the case of FIG. 1B, a pair of hatched portions 7
The hatched portion 7a on the right side of a and 7b is larger than the left hatched portion 7b by the portions 8a and 8b indicated by double oblique lines at the upper and lower ends of the hatched portion 7a. FIG.
In the case of (B), the left-side hatched portion 7b is lower at the upper and lower ends of the right-side hatched portion 7b than the right-side hatched portion 7a.
Only the portions 8a and 8b indicated by heavy oblique lines are larger. In the case of FIG. 3 (B), the shaded portion 7b on the left is larger than the shaded portion 7a on the right by the portion 8 indicated by double oblique lines at the base end of the lead portion 3b of the electrode 3. . The double-hatched portions 8a, 8b, 8 are portions where any of the lead portions 2b to 5b overlaps with any of the electrodes 2 to 5 on the opposite side via the pyroelectric film 1. The double hatched portions 8a, 8b, 8 correspond to the first and second portions.
It can be seen that the effective light receiving electrode areas of the unit pyroelectric elements are different from each other.

As described above, the double hatched portions 8a, 8b,
The reason why 8 occurs is that FIGS. 1 (B), 2 (B) and 3
In (B), the lead portions 2b to 5b are connected to the electrode body 2a.
~ 5a, the direction in which it begins to extend (that is,
When the patterns of the electrodes 2 to 5 are displaced in the vertical and / or horizontal directions on the front and back surfaces of the pyroelectric film 1 because the drawing start directions are different from each other, the displacement between the electrodes 2 and 4 is This is because the state and the state of displacement between the electrode 3 and the electrode 5 are different from each other.

In order to solve such a problem, the surface electrodes 2 and 3 of the pyroelectric film 1 are designed to be smaller than the back electrodes 4 and 5 so that the electrode patterns may be slightly shifted between the front and back sides. As shown in FIG. 3 (A), a method for performing this is already known. However, even in the case of such a design, as shown in FIG.
The effective light receiving electrode area differs between the first and second unit pyroelectric elements.

The present inventor has devised a pyroelectric element device (hereinafter referred to as a "reference device") described below separately from the present invention based on the above findings.

That is, this reference example device has a pyroelectric film, a plurality of electrodes of a first group provided on one surface of the pyroelectric film, and a pyroelectric film on the other surface of the pyroelectric film. A plurality of electrodes of a second group provided. Also,
In this reference example device, each electrode of the first and second groups is integrally formed from the electrode body for providing an effective light receiving electrode area and the electrode body for lead connection to another electric circuit. A plurality of electrodes of the first group, a plurality of electrodes of the second group, and a plurality of electrodes of each of the first and second groups. A plurality of unit pyroelectric elements are constituted by the pyroelectric film interposed between the electrodes.

Further, in the reference example device, the first electrode of the first group, the first electrode of the second group, and the pyroelectric film interposed between the two first electrodes may be provided. Constitutes a first unit pyroelectric element by
A second unit pyroelectric element is constituted by the second electrode of the first group, the second electrode of the second group, and the pyroelectric film interposed between the two second electrodes. I have. Further, in this reference example device, the first and second units are connected such that the first unit pyroelectric element is connected in parallel to the second unit pyroelectric element with their polarization directions reversed. In order to lead-connect each of the first and second electrodes of the pyroelectric element to the other electric circuit, the leading end of the lead portion of the first electrode of the first group is connected to the second group. The tip portion of the lead portion of the second electrode is substantially opposed to the pyroelectric film across the pyroelectric film, and the tip portion of the lead portion of the second electrode of the first group is the second electrode. The tip of the lead portion of the first electrode of the group is substantially opposed to the pyroelectric film. In this reference example device,
Even if the patterns of the plurality of electrodes of the first group are formed to be slightly displaced from the patterns of the plurality of electrodes of the second group, the first and second patterns of the first group are formed. So that the effective light receiving electrode area formed by the respective overlapping portions of the electrodes and the first and second electrodes of the second group does not substantially differ between the unit pyroelectric elements. The direction in which the lead portions of the plurality of electrodes are drawn out from the electrode body and start to extend is substantially the same as each other, and the widths of the portions to start extending are also substantially the same. Each of the lead portions of the plurality of electrodes of the second group has the same size, and the directions in which the lead portions are drawn out of the electrode body and start to extend are substantially the same as each other; Width of the portion begins Mashimashi this extension is also substantially the same size with each other.

Therefore, when a pyroelectric infrared sensor is manufactured in accordance with the conventional method using the reference device (that is, the pyroelectric device) configured as described above, the electrode pattern is formed on both sides of the pyroelectric film. Even if the surfaces are slightly displaced from each other, the effective light receiving electrode area of the plurality of unit pyroelectric elements constituting the pyroelectric element device becomes substantially the same between the unit pyroelectric elements, so that disturbance light A sensor having excellent electrical characteristics with respect to.

Next, a specific example of the reference device constructed as described above will be described with reference to FIGS. 4 (A) and 4 (B). In these figures, FIGS.
Parts common to those in FIG. 1B are denoted by the same reference numerals.

In FIG. 4A, reference numeral 1 denotes a pyroelectric film, on the surface of which the front electrodes 2 and 3 are formed, and on the back surface, the back electrodes 4 and 5 are formed.

The electrodes 2 to 5 have a substantially rectangular parallelepiped electrode body 2a to 5a for providing an effective light receiving electrode area, and these electrodes for lead connection with other electric circuits (not shown). Drawer portions 2b to 5b which are integrally pulled out from main bodies 2a to 5a and extend therefrom, and these drawer portions 2b to 5b
b of terminal portions 2c to 5c. The width of each of the lead portions 2b to 5b is smaller than the width of each of the electrode main bodies 2a to 5a. The electrode bodies 2a and 3a of the electrodes 2 and 3 have substantially the same shape, and the electrode bodies 4a and 5a of the electrodes 4 and 5 have the same shape.
Are almost identical. However, the electrode main bodies 4a, 5a do not have any positional deviation from the electrode main bodies 2a, 3a.
In the case shown in (A), the electrode body 2a, 3a is configured to have a protruding portion 11 over substantially the entire periphery thereof.

The lead portions 2b to 5b are connected to the electrode main bodies 2a to 2b.
The directions in which the base portions 9 are drawn out from 5a and start to extend are almost the same as each other, and the widths of the proximal end portions 9 which start to extend are almost the same as each other. In the text, the “same direction” means a parallel direction or a completely same direction and the same direction.

The draw-out portions 2b to 5b have a base portion 9 extending in the same direction by a short length and a portion 10 which is pulled out from the base portion 9 in a direction substantially perpendicular to and extends substantially in an L-shape. And consists of The terminal portions 2c to 5c are formed by the tip portions of these portions 10. Also,
The drawers 2b to 5b are formed such that their base end portions 9 do not overlap each other. And electrode 2
The terminal portions 2c and 5c are opposed to each other on both sides of the pyroelectric film 1 at the edge of the pyroelectric film 1.
Similarly, the terminals 3c and 4c of the electrodes 3 and 4 are opposed to each other on the front and back sides of the pyroelectric film 1 at the edge of the pyroelectric film 1. The patterns of the front electrodes 2 and 3 and the patterns of the back electrodes 4 and 5 are almost symmetrical on the front and back of the pyroelectric film 1 except for the protruding portion 11.

Therefore, the first unit pyroelectric element is constituted by the electrode 2, the electrode 4, and the portion of the pyroelectric film 1 interposed between the electrodes 2 and 4.
The electrode 3, the electrode 5, and the portion of the pyroelectric film 1 interposed between these electrodes 3 and 5 form the second
Are constituted. And these first
By connecting the second unit pyroelectric element and the second unit pyroelectric element in parallel so that their polarities are opposite to each other, a pyroelectric element device composed of an anti-pyroelectric element is configured. In order to connect in parallel such that the polarities are opposite to each other, the terminal 2c of the front surface electrode 2 and the terminal 5c of the back surface electrode 5 must be connected to each other as disclosed in Japanese Patent Application Laid-Open No. As disclosed in Japanese Patent Publication No. 131,996, they are electrically connected to common lead wires (not shown). The terminal 3c of the front electrode 3 and the terminal 4c of the back electrode 4 are connected to the terminal 2 of the electrodes 2 and 5.
As in the case of c and 5c, each is electrically connected to another common lead wire (not shown).

FIG. 4B shows that the pattern of the front electrodes 2 and 3 and the pattern of the back electrodes 4 and 5 in the pyroelectric device shown in FIG. 2 shows a state where the positions are shifted from each other. Such misalignment often occurs due to a manufacturing error in forming the electrodes 2 to 5 on the pyroelectric film 1.

In FIG. 4B, since the base portions 9 of the lead portions 2b to 5b of the electrodes 2 to 5 are drawn in the same direction, the state of displacement between the electrodes 2 and 4 and the position of the electrodes 3
The state of misalignment between 5 and 5 is point-symmetrically similar to each other, including the lead portions 2b to 5b. For this reason, the effective light receiving electrode area of the first unit pyroelectric element and the second unit pyroelectric element does not substantially differ from each other as shown by hatched portions 7a and 7b in FIG. 4B. .

However, in the device of the reference example whose specific example is shown in FIGS. 4A and 4B, two unit pyroelectric elements are connected in parallel so that their polarization directions are opposite to each other. However, depending on the application of the pyroelectric infrared sensor, two unit pyroelectric elements are connected in series or a connection similar to this series connection such that their polarization directions are opposite to each other (see FIG. 5 described later). The connection as shown below,
In some cases, a pyroelectric element device in a “pseudo-series connection” is required, and in such a case, the above-described reference example device cannot be used. Further, in the case of the above-mentioned reference example device, a pair of terminal portions of a pair of electrodes respectively arranged on both sides of the pyroelectric film so as to face each other with the pyroelectric film interposed therebetween are connected to a common lead. Since the wires need to be connected, the work of connecting the electrodes to the lead wires is troublesome.

Accordingly, an object of the present invention is to provide a pyroelectric element device in which a plurality of unit pyroelectric elements are connected in series or pseudo-series, which have excellent electrical characteristics with respect to disturbance light, It is an object of the present invention to provide a simple connection work to a lead wire.

[0029]

According to the present invention, there is provided a pyroelectric element device as set forth above, wherein the terminal portion comprises a first electrode of the plurality of unit pyroelectric elements. The first plurality of first pyroelectric films are arranged at the edge of the one surface of the pyroelectric film for lead connection with the other electric circuit at the edge of the one surface of the pyroelectric film. Each of the electrodes further has a lead-out portion that is integrally pulled out from the electrode body and extends to the terminal portion and is formed integrally with the terminal portion, and each of the plurality of first electrodes has a lead-out portion. The lead portion is constituted by an overlapping portion of the first electrode and the second electrode, even if the pattern of the first electrode is formed to be slightly displaced from the pattern of the second electrode. The effective light-receiving electrode area is The directions in which the electrodes are drawn out of the electrode body and start to extend are substantially the same as each other, and the widths of the portions to start extending are also substantially the same in size. And the second
The electrode body of the electrode is an electrode body of the plurality of first electrodes.
And a protruding portion around the overlapped portion.

[0030]

FIG. 5A and FIG. 5B show a pyroelectric device according to an embodiment of the present invention. Note that, in FIGS. 5A and 5B, the same reference numerals are given to portions common to FIGS. 4A and 4B.

In FIG. 5A, on the back surface of the pyroelectric film 1, back electrodes 4 and 5 are formed. These back electrodes 4, 5 extend in parallel with each other and provide an effective light receiving electrode area, and an electrode main body 4a, 5a extends from the electrode main body 4a, 5a in a direction in which the electrode main bodies 4a, 5a extend. Narrow width lead portions 4b, 5b which are integrally pulled out and extend to the vicinity of the edge of pyroelectric film 1, and terminal portions 4c, 5 which are constituted by the tip portions of these lead portions 4b, 5b.
c. Therefore, the drawers 4b, 5
b are drawn out and extended to the same side substantially along the direction in which the electrode main bodies 4a, 5a extend.

The terminal portions 4c and 5c are used to lead-connect the back electrodes 4 and 5 to another electric circuit (not shown) at the edge of the back surface of the pyroelectric film 1 so that the back electrodes 4 and 5 can be connected to other electric circuits (not shown). Are juxtaposed to each other at the edge of the. Then, the electrode main bodies 4a, 5a
The lead portions 4b, 5b integrally pulled out from the terminals extend to the terminal portions 4c, 5c, and extend to these terminal portions 4c, 5c.
And are formed integrally. Also, the drawers 4b, 5b
Is smaller than the width of any of the electrode bodies 4a, 5a and the terminal portions 4c, 5c, and the width of the terminal portions 4c, 5c is smaller than the width of the electrode bodies 4a, 5a.

On the surface of the pyroelectric film 1, surface electrodes 2, 3
Are formed. The front electrode 2 overlaps with one half of the back electrodes 4, 5 in the first direction on which the electrode bodies 4a, 5a extend, and the electrode bodies 2a ₁ , 2a ₂ for providing an effective light receiving electrode area. And a narrow connecting portion 1 connecting these electrode bodies 2a ₁ and 2a ₂ to each other.
It consists of two. Further, the surface electrode 3, the electrode body 4a of the back electrode 4, 5, 5a of the first electrode body 3a ₁ for providing respective overlap and the effective light-receiving electrode area to another half of the side opposite to the direction, 3a ₂ and a narrow connecting portion 12 connecting these electrode bodies 3a ₁ and 3a ₂ to each other. Further, a narrow gap 13 is provided between the surface electrodes 2 and 3. Therefore,
The front electrodes 2 and 3 do not have a lead portion or a terminal portion unlike the back electrodes 4 and 5.

The electrode bodies 2a ₁ , 2a ₂ , 3a ₁ , 3a ₂
In the case shown in FIG. 5 (A) in which there is no displacement between the electrode main bodies 4a and 5a, the portion 11 protruding from the electrode main bodies 4a and 5a is substantially removed except for the part facing the gap 13. It is provided all around. The directions of the lead portions 4b and 5b which are pulled out from the electrode main bodies 4a and 5a and start to extend are substantially the same as each other, and the width of the base end portion 9 which starts to extend is also substantially the same.

Therefore, the electrode body 2 of the surface electrodes 2 and 3
a ₁ , 3a ₁ , the back electrode 4, and a portion of the pyroelectric film 1 interposed between the electrode main bodies 2 a ₁ , 3 a ₁ and the electrode 4 form a first unit pyroelectric element. It is configured. Further, the electrode bodies 2a ₂ , 3a of the surface electrodes ₂ , 3
₂ , a back electrode 5, and a portion of the pyroelectric film 1 interposed between the electrode main bodies 2a ₂ and 3a ₂ and the back electrode 5 to form a second unit pyroelectric element. I have. The terminal portion 4c of the back electrode 4 is electrically connected to another electric circuit by a lead wire (not shown), and the terminal portion 5c of the back electrode 5 is connected to another electric circuit and another lead wire. (Not shown).

When the surface electrodes 2 and 3 are formed integrally with each other and are electrically connected to each other, the first and second unit pyroelectric elements are conventionally known. These polarities are connected in series so that the polarities thereof are opposite to each other, thereby forming a pyroelectric element. However, in this embodiment, the gap between the surface electrodes 2 and 3 is 1
Since they are separated from each other via the reference numeral 3, they are connected in a quasi-series manner so that the polarities are opposite to each other, thereby forming a pyroelectric element.

FIG. 5B shows that the front electrodes 2 and 3 and the back electrodes 4 and 5 are displaced from each other in the vertical and horizontal directions by the width of the protruding portion 11 in the pyroelectric device shown in FIG. It shows the state that it is doing.

In FIG. 5B, since the base portions 9 of the lead portions 4b and 5b of the back electrodes 4 and 5 are drawn in the same direction, the electrode bodies 2a ₁ and 3a of the front electrodes 2 and 3 are drawn.
₁ and the state of the displacement between the electrode 4 and the surface electrodes 2 and 3
Of the electrode main bodies 2a ₂ , 3a ₂ and the back electrode 5 are similar to each other, including the lead portions 4b, 5b. To this end, the first unit pyroelectric element and the second unit
The total sum of the effective light receiving electrode areas of the unit pyroelectric elements of FIG. 5 is shown as hatched portions 7a ₁ and 7a ₂ and hatched portions 7b ₁ and 7b ₂ in FIG. There is no significant difference. In other words, the effective light-receiving electrode area of the first unit pyroelectric element which is the sum of the hatched portion 7a ₁ and 7a _2, even if the electrode patterns on the front and back sides of the pyroelectric film 1 is slightly shifted, the hatched portion effective light-receiving electrode area of the second unit which is the sum of the 7b ₁ and 7b ₂ pyroelectric element to be always substantially the same.

The present invention is not limited to the electrode pattern shown in FIG. 5, but includes two lead portions 4b, 5b.
Other electrode patterns may be used as long as the directions in which they are drawn out and start to extend are substantially the same and their widths are also substantially the same size. Also, the pyroelectric device according to the present invention does not necessarily need to be composed of only a pair of unit pyroelectric devices, and the pyroelectric device composed of more than a pair of unit pyroelectric devices is sealed in a common package. The present invention can be applied to the pyroelectric infrared sensor described above.

[0040]

According to the present invention, even if the electrode patterns are slightly displaced from each other on both sides of the pyroelectric film, a plurality of unit pyroelectric elements are connected in series or pseudo series connection. Since the effective light receiving electrode area of the plurality of unit pyroelectric elements constituting the photoelectric element device is substantially the same between each unit pyroelectric element, a pyroelectric infrared sensor is manufactured using the pyroelectric element device. In this case, a sensor having excellent electric characteristics with respect to disturbance light can be obtained.

Further, the electrode which needs to be lead-connected to another electric circuit is the first electrode provided on one surface of the pyroelectric film.
And the lead connection can be performed using the terminal portion arranged at the edge of the pyroelectric film, so that the operation for connecting the electrode lead is extremely simple. Further
In addition, the electrode body of the second electrode is connected to a plurality of electrodes of the first electrode.
It has a protruding part around the overlapping part with the pole body.
Electrode pattern on both sides of the pyroelectric film
The positions are slightly shifted from each other within the protruding part.
Also, multiple unit pyroelectric elements are connected in series or pseudo series.
The plurality of unit focuses constituting the connected pyroelectric element device
Since the effective light receiving electrode area of the
A pyroelectric infrared sensor was manufactured using this pyroelectric device.
Has better electrical characteristics against disturbance light.
A sensor can be obtained.

[Brief description of the drawings]

FIG. 1A is a perspective view of a conventional pyroelectric device, and FIG. 1B is a state in which a front electrode and a back electrode of the pyroelectric device shown in FIG. FIG.

FIG. 2A is a plan view of another conventional pyroelectric device, and FIG. 2B is a plan view of the pyroelectric device shown in FIG. FIG.

FIG. 3A is a plan view of still another conventional pyroelectric device, and FIG. 3B is a diagram illustrating the pyroelectric device shown in FIG. FIG.

FIG. 4A is a plan view of a pyroelectric device according to a reference example of the present invention, and FIG. 4B is a plan view of the pyroelectric device shown in FIG. It is a top view showing the state where it is doing.

FIG. 5A is a plan view of a pyroelectric device according to an embodiment of the present invention, and FIG. 5B is a plan view of the pyroelectric device shown in FIG. It is a top view showing the state where it shifted.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pyroelectric film 2 Surface electrode 2a ₁ Electrode main body 2a ₂ Electrode main body 3 Surface electrode 3a ₁ Electrode main body 3a ₂ Electrode main body 4 Back surface electrode 4a Electrode main body 4b Leader 4c Terminal 5 Back electrode 5a Electrode main 5b Leader 5c Terminal Part 9 Base end part 12 Connection part

Claims (4)

(57) [Scope of request for utility model registration] A pyroelectric film, a first electrode provided on one surface of the pyroelectric film, and a second electrode provided on the other surface of the pyroelectric film. The first electrode is composed of a plurality of electrodes, and each of the plurality of first electrodes is used for lead connection between an electrode body for providing an effective light receiving electrode area and another electric circuit. An electrode body for providing an effective light-receiving electrode area in opposition to the electrode body of the first electrode, the electrode body having a terminal portion integrally formed with the electrode body. Wherein a plurality of unit pyroelectric elements are constituted by the first and second electrodes and the pyroelectric film interposed between the first and second electrodes. In the electronic device, the terminal unit may be configured to connect the first electrodes of the plurality of unit pyroelectric elements to the focus. The lead electrode is disposed at the edge of the one surface of the pyroelectric film for lead connection with the other electric circuit at the edge of the one surface of the body film; Each of the plurality of first electrodes further includes a lead portion that is integrally pulled out from the electrode main body, extends to the terminal portion, and is formed integrally with the terminal portion. Means that the pattern of the first electrode is slightly shifted from the pattern of the second electrode.
The direction in which the effective light-receiving electrode area formed by the overlapped portion of the second electrode and the second electrode does not substantially differ between the unit pyroelectric elements and is drawn out from the electrode body and starts to extend substantially. to the same direction to each other and, together with the width of the portion begins Mashimashi this extension is also substantially the same size with each other, the electrode body of the second electrode, the first electrode of the plurality
Has a protruding part around the overlapping part with the electrode body
Pyroelectric element and wherein the that. 2. The method according to claim 1, wherein each of said first and second electrodes is
One of the second electrodes is composed of the two first electrodes.
First and second electrode bodies respectively opposed to one half of the electrode body of the first electrode, and a narrow first connection portion for electrically connecting the first and second electrode bodies to each other. The other of the second electrodes is connected to the two first electrodes.
A first and a second electrode body respectively facing the other half of the electrode body of the first electrode and a narrow second connecting portion for electrically connecting the first and the second electrode body to each other. The pyroelectric device according to claim 1, further comprising: 3. The width of each lead portion of the first electrode is smaller than the width of each electrode body of each of the first electrodes, and is smaller than the width of each terminal portion of each of the first electrodes. The pyroelectric element device according to claim 1, wherein: 4. The respective lead-out portions of the plurality of first electrodes are pulled out to the same side substantially along the direction in which the electrode bodies of the first electrodes extend, and extend. The pyroelectric device according to any one of claims 1 to 3 , wherein