JPH04319682A - Infrared optical apparatus - Google Patents

Abstract

PURPOSE:To simultaneously search a target over a wide visual field. CONSTITUTION:A plurality of object lenses 1a, 1b condensing infrared rays and fold-back mirrors 2a, 2b placed at the focal positions of the object lenses 1a, 1b are provided and the images of the object lenses 1a, 1b are again formed on the divided detection element groups on an infrared two-dimensional array detector 5 to be detected.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to an infrared optical device.
In particular, it relates to an infrared optical device that searches for targets over a wide field of view.

0002

[Prior Art] FIG. 5 shows a conventional target searching device (infrared optical device) disclosed in, for example, Japanese Patent Application Laid-Open No. 60-88373.
FIG. In the figure, 7 is a target detection device, and 8 is a pedestal.

Next, the operation will be explained. The target detection device 7 detects a target over a wide field of view by scanning the instantaneous field of view in the vertical direction using an internal scanning device, and searching the space by being moved horizontally by a pedestal 8.

0004

[Problems to be Solved by the Invention] Since the conventional target searching device is configured as described above, the pedestal must be mechanically driven to search for the target, and in order to search a wide field of view, the pedestal must be mechanically driven. The problem was that it took a long time to search for the target.

[0005] This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide an infrared optical device that can search for a target over a wide field of view without having to mechanically scan in the left and right directions using a pedestal. purpose.

[0006]

[Means for Solving the Problems] An infrared optical device according to the present invention has a plurality of objective lenses, and uses a folding mirror installed at the focal position of the objective lenses to transmit the image of each objective lens via a relay lens. The image is then re-imaged onto a two-dimensional infrared array detector.

[0007]

[Operation] This invention has a plurality of objective lenses, and a folding mirror installed at the focal position of the objective lenses allows
Since the images of each objective lens are re-imaged on the infrared two-dimensional array detector via the relay lens, it is possible to instantly search for a target over a wide field of view.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an infrared optical device according to an embodiment of the present invention. In FIG. 1, 1a and 1b are objective lenses that condense infrared rays, 2a and 2b are folding mirrors placed at the focal positions of the objective lenses 1a and 1b, and 3 is a re-forming image of the objective lenses 1a and 1b. Relay lens, 4
5 is an infrared optical system having the objective lenses 1a and 1b, folding mirrors 2a and 2b, and a relay lens 3, and 5 is an infrared two-dimensional array detector provided at the imaging position of the infrared optical system 4. FIG. 2 is an explanatory diagram showing the image plane of the infrared optical system 4, and in the figure, 6a and 6b are respective detection elements of the two-dimensional array detector 5.

Next, the operation will be explained. As shown in FIG. 1, the infrared light imaged by each objective lens 1a, 1b is guided to a relay lens 3 by folding mirrors 2a, 2b, and reimaged on an infrared two-dimensional array detector 5. As shown in FIG. 2, half of the detection element 6a group of the infrared two-dimensional array detector 5 detects the image formed by the objective lens 1a and the folding mirror 2a, and the remaining detection element 6b group similarly detects the image formed by the objective lens 1a and the folding mirror 2a.
, detects the image by the folding mirror 2b. Furthermore, objective lens 1
Since wide-angle (180°) lenses are used for a and 1b,
You can search all around.

As described above, this embodiment has a plurality of objective lenses 1a, 1b, and each objective lens 1a, 1b is Since the image is re-imaged and detected on the divided detection element group on the infrared two-dimensional array detector 5 via the relay lens 3, it is possible to instantly search for the target over a wide field of view.

In the above embodiment, the detection element group is divided into two to form detection element groups 6a and 6b, and objective lenses 1a and 1
b and folding mirrors 2a, 2b are shown as two sets, but as shown in FIG. The target search may be performed by re-imaging the object, dividing the detection element group into three, and thereby efficiently expanding the field of view.

Further, in the above embodiment, the objective lenses 1a and 1b are arranged so as to search the entire circumference, but the objective lenses 1a and 1b and the folding mirrors 2a and 2b may be arranged in accordance with the direction of the search object.

Furthermore, although two folding mirrors were used in the above embodiment, one folding mirror may be rotated at high speed by a rotating mechanism 9, or provided arbitrarily in the direction of the objective lenses 1a and 1b, as shown in FIG. Then, the image may be formed on a group of detection elements on the two-dimensional array detector 5.

[0014]

[Effects of the Invention] As described above, according to the infrared optical device according to the present invention, images formed by a plurality of objective lenses are formed on a two-dimensional infrared array detector via a folding mirror and a relay lens. This has the effect of instantly searching for a target over a wide field of view without having to mechanically scan the target detection device in the left and right directions.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an infrared optical device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an image plane of an infrared optical system according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing another embodiment of the present invention.

FIG. 4 is a configuration diagram showing still another embodiment of the present invention.

FIG. 5 is a diagram showing a conventional target search device.

[Explanation of symbols]

1 Objective lens 2 Reflection mirror 3 Relay lens 4 Infrared optical system 5 Infrared two-dimensional array detector 6a
, 6b detection element

Claims (1)

[Claims] 1. An infrared optical system comprising a plurality of objective lenses for condensing infrared rays, a folding mirror placed at the focal position of each objective lens, and a relay lens for re-forming the image of the objective lens. , and an infrared two-dimensional array detector for detecting images of each of the objective lenses.