JPS61255155A - Optical video sensor - Google Patents

Abstract

PURPOSE:To obtain a wide visual sight with the use of an optical system of a narrow angle by arranging a plane mirror and a linearly arranged photoelectric conversion detector one by one by one correspondence and combining each plane mirror with linearly arranged photoelectric conversion detector so as to provide a different visual field from each other. CONSTITUTION:The plane reflecting mirrors 6-8 are coupled with the linearly arranged photoelectric conversion detectors C1-C3 one by one, its normal spectrum is directed in different direction with each other t constituted respectively visual fields V1-V3 thereby obtaining a wide visual field expressed as S1+S2+S3. In this case, since the arranging direction of the linearly arranged photoelectric conversion detectors C1-C3 is made orthogonal in the element arranging direction in the inside of each converter, for example, the wide angle of visual field is compressed within a narrow visual field. Since no mechanical moving part is needed, a video sensor with high reliability is realized. Since no optical system having a wide angle characteristic is required, the constitution of the optical system is simple and the weight is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an optical image sensor that is mounted on a flying object and takes images of the earth.

[Conventional technology]

Figure 2 shows a conventional optical image sensor that belongs to the mechanical scanning system.
is a plane scanning mirror, and (3) is a photoelectric conversion detector.

(4) is a plane scanning mirror drive mechanism, (5) is a housing, and α is the earth.

Figure 3 is a diagram showing another conventional optical image sensor II).
C is a linear array photoelectric conversion detector. Also, Fig. 4 is a configuration diagram showing a linear array photoelectric conversion detector.

b is a transfer gate-Fv c1ec2...cn is a charge coupled device (charge, couple de
vice ), (l is a preamplifier. In this configuration, the electric charge generated on the photodetector according to the brightness of the image of the ground surface formed on the photodetectors a1 to &n is generated at regular intervals. The charge is then transferred to the charge-coupled devices c1 to QB under the control of the transfer gate b, and this charge is sequentially transferred to the matching charge-coupled devices and read out to the outside as a temporally serial signal via the preamplifier d. It acts so that it is done.

[Problem that the invention seeks to solve]

In the conventional mechanical scanning image sensor shown in Figure 2, the instantaneous field of view is directed to a single point on the ground surface, and the plane scanning mirror (2)
The reciprocating rotational movement of the satellite scans the ground surface in the mouth direction, and at the same time, the field of view of the entire image sensor moves in the convex direction due to the movement of the satellite, making it possible to obtain a two-dimensional image as a whole. However, this configuration requires a mechanical scanning mechanism, and because it uses point-shaped photodetectors, there are problems in that the time required to detect an image of a single point on the ground surface is short and the sensitivity is low. .

In addition, in the image sensor using the linear array photoelectric conversion detector shown in Fig. 3, an image of the entire field of view can be obtained on the linear array detector at the same time, so the time required to detect the image can be lengthened, and the sensitivity is increased. However, in order to observe a wide area, it is necessary to use an optical system with excellent wide-angle characteristics, making it difficult to design.

The present invention was made to solve these problems, and an object of the present invention is to obtain an optical image sensor using an optical system that does not require a mechanical scanning mechanism and does not require wide-angle characteristics.

[Means for solving problems]

The optical image sensor of the present invention has a plane mirror and a linear array photoelectric conversion detector arranged in a one-to-one correspondence, and each pair of plane mirror and linear array photoelectric conversion detector is combined so as to have different fields of view, It uses a narrow-angle optical system to obtain a wide field of view.

[Effect]

In this invention, a plane mirror is used to guide an observation object in a wide-angle field of view into a narrow-angle field of view, so a wide-angle field of view is obtained using an optical system with a narrow-angle characteristic that is easy to design.

〔Example〕

Fig. 1 is a block diagram of an optical image sensor showing an embodiment of the present invention. In Fig. 1, (6) to (8) are plane reflecting mirrors e. This is the same linear array photoelectric conversion detector.

9. The plane reflecting mirrors (6) to (8) are coupled one-to-one with each of the linear array photoelectric conversion detectors 01 to C3, and their normal vectors are oriented in different directions. The visual field v1 to the visual field v3 are respectively configured.

As a whole, a wide field of view represented by s1+s2+s5 is obtained. In this way, an image sensor with a wide field of view can scan the ground surface in the direction of C as the flying object moves and obtain a two-dimensional image. □In this example,
Since the arrangement direction of the linear array photoelectric conversion detectors 01 to C3 and the arrangement direction of elements inside each converter are perpendicular to each other, a wide-angle field of view can be compressed into a narrow viewing angle. Furthermore, since it does not have any mechanical moving parts, a highly reliable image sensor can be realized. Further, since an optical system having wide-angle characteristics is not required, the structure of the optical system is simple and the weight can be reduced.

In the above embodiment, the optical lens (1) is used, but it is clear that the same operation can be performed even if a reflective optical system is used.

Furthermore, not only a linear array but also a dihedral array detector may be used as the photoelectric conversion detector to operate in the same manner.

〔Effect of the invention〕

As described above, this invention uses an optical system with only a narrow-angle field of view, a plane mirror, and a linear or planar array photoelectric conversion detector to obtain an optical image sensor without mechanically moving parts. This has the effect of making it possible to realize highly reliable optical image sensors that can be installed in buildings, etc.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an optical image sensor showing an embodiment of the present invention, FIGS. 2 and 3 are diagrams showing a conventional optical image sensor, and FIG. 4 is a configuration diagram showing a linear array photoelectric conversion detector. It is a diagram. In the figure, (1) is an optical lens, (6) to (8) are plane reflecting mirrors y, and C1=C5 is a linear array photoelectric conversion detector. It should be noted that the same or corresponding parts in FIG. 1 are denoted by the same reference numerals.

Claims (1)

[Claims] In an image sensor comprising an optical system that forms a real image, a plurality of linear or planar array photoelectric conversion detectors arranged on the focal plane of the optical system, and a plurality of plane mirrors used in combination with the optical system, the plane mirror and The linear or planar array photoelectric conversion detectors are arranged in one-to-one correspondence, and each plane mirror and the linear or planar array photoelectric conversion detector pair have different fields of view. Optical image sensor.