JPH06100506B2 - Infrared imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention has the same effect as equivalently increasing the number of pixels by displacing the observation field of view in an infrared imaging apparatus using a two-dimensional infrared detection element. In this way, a high resolution image is obtained.

[Industrial application field]

The present invention relates to an infrared imaging device, and more particularly to a high resolution image forming device.

The infrared imaging device detects infrared rays radiated corresponding to the temperature of the object and forms an image to measure the temperature of the object.

In particular, a device that can display the temperature distribution of an observed object on a two-dimensional TV is used for medical purposes such as diagnosis of blood circulation disorders, and recently for industrial purposes, internal defect inspection of composite materials, thermal design of buildings and devices, concrete wall It is applied to crack inspection and diagnosis.

In such applications, high temperature resolution, high resolution, and real-time display are required, and it is necessary to use a multi-element detector. A device using a linear detection element has been put to practical use as such a detector, but the performance is not sufficient, and a multi-element two-dimensional detection element (eg, IRCCD infrared charge coupled device) is put to practical use in the industrial field. Is desired.

[Conventional technology]

FIG. 5 shows a configuration diagram of a conventional infrared imaging device. In the figure, 1 is the observation field of view, 2 is 10 surfaces (1F, 2F, 3F ... 10 on each surface)
Polygon scanners having different tilt angles (denoted by the symbol F), 3 is a reflecting mirror, 4 is a condenser lens system, and 5 is a linear detection element consisting of 6 elements.

In the conventional infrared imaging device, the 6 linear detection elements 5
By rotating the polygon scanner in the direction of arrow R using
..1 / 1 of polygon scanner 2 as shown in 1-6
Horizontal scanning is performed once every 0 rotations (direction of arrow H) and vertical scanning (scanning in direction of arrow V corresponding to 1F surface, 2F surface, etc.) according to the tilt angle is performed in an interlaced manner, and horizontal resolution is 120 lines,
It consisted of a screen with 60 vertical resolutions. That is, one frame is formed by 10 fields.

[Problems to be solved by the invention]

In the conventional infrared imaging device, the linear detection element 5 is used, but since the number of elements is small (6 elements in this example), sufficient temperature resolution and resolution cannot be realized.

In order to solve this, it becomes necessary to use a two-dimensional infrared detector having many elements. If the number of elements is increased, the resolution will inevitably increase.

Such a two-dimensional infrared detecting element has a dead part 22 due to a structural problem as shown in FIG. 1, and it is necessary to supplement this dead part in order to improve the resolution.

[Means for solving problems]

In the infrared imaging device of the present invention, each light receiving portion 21 corresponding to a storage type infrared detecting element as shown in FIGS. 1 and 3 has vertical and horizontal dimensions of d × d, and a distance d from each adjacent light receiving portion. In the infrared imaging in which the two-dimensional infrared detection element 10 which is arranged in a matrix with the isolated portion being the light insensitive portion 22 receives the light transmitted through the condenser lens system 4 and photoelectrically converts it. A field-of-view switching means for displacing the field of view in the X and Y directions orthogonal to the optical axis 31 of the condenser lens system 4.
34 is provided, and the visual field switching means 34 is composed of piezoelectric elements 32 and 33 that expand and contract in the X direction and the Y direction, respectively, and the regions corresponding to the insensitive portions 22 in the observation visual field 30 are sequentially processed by the visual field switching means 34. Read by the light receiving unit 21,
The output at each switching position of the observation visual field 30 is displayed as an output of one pixel.

[Action]

In the principle diagram of FIG. 2, by switching the field of view, each light receiving portion (11 to 19) of the two-dimensional infrared detecting element 10 has the same effect as being sequentially moved to the insensitive portion around it. You can have it. Therefore, the 3 × 3 pixel infrared detecting element 10 is equivalent to the 6 × 6 pixel infrared detecting element, and an image of 4 times as many pixels (101 to 136) can be displayed. This view switching is performed by synchronizing the condenser lens system 4 shown in FIG.
With 3,34, high-speed minute displacements can be performed in the X direction and the Y direction, respectively, so that there is an effect that real-time imaging can be performed. In this case, the dimension d × d of the light receiving portion is 1
It is optically set so that it becomes a pixel.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. In addition, in order to make the description of the configuration and the operation easy to understand, the same reference numerals are given to the same portions throughout the drawings, and the duplicated description will be omitted.

FIG. 3 shows a block diagram of an embodiment of the present invention. In the figure, 30
Is an observation field of view, 31 is an optical axis connecting the center of the observation field of view 30 and the center of the condenser lens system 4, 32 is a piezoelectric element for displacing the condenser lens system 4 in the X direction orthogonal to the optical axis 31, and 33 is Its optical axis
A piezo-electric element for displacing the condenser lens system 4 in the Y direction orthogonal to 31 and having both piezo-electric elements as a visual field switching means.
Make up 34. Reference numeral 35 is a holder of the visual field switching means 34. Here, the amount of displacement in the X direction is ± X, the amount of displacement in the Y direction is ± Y, and the amount of optical axis displacement on the two-dimensional infrared detection element corresponding to each amount of displacement is optically set to be d. .

A broken line frame 36 indicates the visual field corresponding to one pixel, and when the visual field switching means 34 is displaced to -X + Y, the visual field 37 of the first field 37.
Allows the two-dimensional infrared detecting element to be seen through the condenser lens system 4.

Similarly, when the visual field switching means 34 is displaced to + X + Y, the visual field 38 of the second field and the visual field switching means 34 are moved to + X-Y.
Field of view 39 of the third field when displaced to the field of view 40, and field of view 40 of the fourth field when the field switching means 34 is displaced to -XY.
Respectively correspond to.

FIG. 4 is a time chart showing the operation of the present invention. In the figure, (c) the X-direction optical axis displacement is performed by the X-direction piezoelectric element 32 as described above, and the timing is (f) synchronized with the operation cycle indicating the operation state of the detection element, and during the accumulation operation. Keeps a constant displacement, and switches the field of view during the reading from the end of the storage operation to the start of the storage operation of the next field.

Since the value of d required for the displacement of the optical axis is several tens to several hundreds of μm, it can be easily achieved by driving the piezoelectric element with a very small value.

(G) The displayed image is the first to fourth images read by switching the field of view.
Make one frame image with the field image. According to this embodiment, the field of view is switched by only slightly vibrating the condenser lens system by the piezoelectric element, so that the apparatus can be made compact without causing image distortion.

〔The invention's effect〕

As described in detail above, according to the infrared image pickup device of the present invention, the same effect as that obtained by increasing the number of pixels of the two-dimensional infrared detection element by four times can be obtained, and the detection without substantially any insensitive portion can be performed. Since it is the same as when the image was picked up by the element, and it is possible to eliminate the detection error of a small object in the distance, it is possible to realize a high-resolution, high-resolution, small-sized, low-cost infrared imaging device, and further a field of view with a piezoelectric element. Due to the switching, there is an effect that real-time imaging becomes possible.

[Brief description of drawings]

FIG. 1 is a structural diagram of a two-dimensional infrared detecting element used in the present invention, FIG. 2 is a diagram for explaining the principle of the present invention, FIG. 3 is a configuration diagram of an embodiment of the present invention, and FIG. 5 is a time chart showing the operation of the present invention, and FIG. 5 is a block diagram of a conventional infrared imaging device. In the figure, 4 is a condenser lens system, 10 is a two-dimensional infrared detecting element, 21 is a light receiving part, 22 is a dead part, 30 is an observation field of view, and 34 is a field of view switching means.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukihiro Yoshida 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited (56) References JP-A-60-27278 (JP, A)

Claims (1)

[Claims] 1. A light receiving unit (2) of a storage type and adjacent pixels.
In an infrared imaging device, wherein 1) receives a light transmitted through a condenser lens system (4) and photoelectrically converts it into a two-dimensional infrared detection element (10) which is isolated by a light dead part (22). Field switching means (34) for displacing the field of view in the X and Y directions orthogonal to the optical axis (31) of the optical lens system (4).
The field-of-view switching means (34) is composed of piezoelectric elements (32, 33) that expand and contract in the X direction and the Y direction, respectively, and an area corresponding to the dead section (22) in the observation field (30) is An infrared imaging device characterized in that the visual field switching means (34) sequentially reads the light by the light receiving section (21), and the output at each switching position of the observation visual field (30) is displayed as an output of one pixel.