JPS6383683A - Optical device for flying object - Google Patents

Abstract

PURPOSE:To easily arrange a parts as a gyro, and to contrive the reduction of the weight of a device and a cost, by transmitting a first light, out of rays of light having different wavelengths with each other, and photoirradiating a second light on a filter which reflects the rays of light in a direction opposite to a transmitting direction. CONSTITUTION:The first and second rays of light having different wavelengths are reflected on a primary mirror 25, and are made incident on a secondary mirror 24'. The secondary mirror 24' is provided with a hollow part, and the first and second rays of light are reflected on the reflecting plane of an outer periphery. The filter 25 receives the first and second rays of light reflected on the secondary mirror 24', and reflects the rays of light on one side in an opposite direction on an optical axis, and transmits the rays of light on the other side. The rays of light reflected on the filter 25 are detected at a detector 26 after passing the hollow part of the secondary mirror 24', and the rays of light transmitting the filter 25 are detected at a detector 27. The detectors 26 and 27 are arranged on the same optical axis 31 as the primary and the secondary mirrors 24 and 24', and the filter 25. In such a manner, when the titled device is used as a seeker for an inductive flying object constituted with a reflection type optical system, it is possible to realize the seeker in which the parts is arranged easily on a gyrocompass, and with light weight, low cost, and superior optical performance.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention provides a flying object used as a seeker for a guided flying object that uses a single reflection type optical system and detects a target in two wavelength bands. The present invention relates to an optical system device for use.

(Prior Art) As is well known, an optical system device used as a seeker for guided flying objects detects a target in two wavelength bands, for example, the visible region and the infrared region. , flame, etc.). Generally, if this is to be achieved with a seeker using a reflective optical system, an optical system device of the optical type shown in FIG. 3 can be easily considered. Here, a COD is used as a detection element for both visible and infrared light.

In FIG. 3, the gyro section 1 is supported by two gimbals 2.3 so as to have two degrees of freedom, and is spatially stabilized by a free gyro method or a rate gyro method. A primary m4 and secondary mirror 4' of the optical system, a dichroic mirror 5, a visible light detection element 6, and an infrared light detection element 7 are attached to this. 8 is a signal that detects target position information from the outputs of the detection elements 6 and 7 and generates a steering control output for causing the flying object to track the target (homing) and a seeker drive output for causing the seeker to track the target. It is a processing circuit. 9 and 10 drive the gyro unit 1 by generating driving forces in directions perpendicular to each other in accordance with the seeker drive output so that the gyro axis 11 coincides with the optical axis of the optical system and points in the target direction. First and second torquers are coupled to the gyro section.

Such a seeker optical system has the following drawbacks.

(1) In order to facilitate the spatial stabilization of the gyro, the gyro section must be symmetrically aligned with the optical axis that coincides with the gyro axis.
Although it is desirable that the components constituting the gyro section be arranged, the visible light detection element 6 does not comply with this principle. In reality, it is necessary to place a dummy weight at the symmetrical position tA of the gyro axis in FIG.

(2) The function of the dichroic mirror 5 is to split the incident light into visible and infrared light, and is generally made of a flat plate. However, in the seeker as shown in FIG. 3, the flat mirror is placed obliquely in the converging light, which deteriorates the aberration of the optical system. In order to avoid this, the dichroic mirror 5 needs to be configured as a mirror block as shown in FIG.
Disadvantages include increased costs.

(Problems to be Solved by the Invention) In the conventional device, it is necessary to arrange dummy weights, and the dichroic mirror needs to be configured as a mirror, which increases weight and costs. It is an object of the present invention to provide an optical system device for a flying object that is suitable as a seeker for guided flying objects, which can be easily arranged as a gyro, is lightweight, and can be manufactured at low cost. purpose.

[Structure of the Invention] (Means for Solving the Problems) An optical system device for a flying object according to the present invention includes a reflecting mirror that reflects first and second lights of different wavelengths, and a reflecting mirror that is the same as the reflecting mirror. a filter disposed on the optical axis that receives the light reflected by the reflecting mirror, transmits the first light and reflects the second light in a direction opposite to the transmission direction; and a filter disposed on the optical axis. and a first detector that detects the light that has passed through the filter, and a second detector that detects the light that has been reflected by the filter.

(Function) The optical system device for a flying object having the above configuration irradiates the filter with the first and second lights reflected by the reflecting mirror, and allows the first light to pass through the filter and the second light to pass through the filter. The particles are reflected in the opposite direction and detected by first and second detectors on the optical axis.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. However, in FIG. 1, the same parts as in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted.

Figure 1 shows the configuration when the optical system device according to the present invention is applied to a seeker for guided flying objects, and the vicinity of the center of the secondary mirror 4' in Figure 3 is a part that is not originally used as a reflecting mirror. , one of the photodetecting elements can be placed in this part. This is done in the seeker shown in FIG. 1, and in the dichroic mirror 5 shown in FIG.

That is, in FIG. 2, first and second lights having different wavelengths are reflected by the primary mirror 24 and are incident on the secondary mirror 24'.

The secondary mirror 24' has a hollow portion, and reflects the first and second light beams at its outer peripheral reflective surface. The filter 25 receives the first and second lights reflected by the secondary mirror 24', and one light is reflected and the other light is transmitted in opposite directions on the optical axis. filter 2
The light reflected by the secondary mirror 24' passes through the hollow part of the secondary mirror 24' and is detected by the detector 26, and the light transmitted through the filter 25 is detected by the detector 27. The detector 26.27 is the primary mirror 24.2
The secondary mirror 24' is arranged on the same optical axis 31 as the filter 25.

In addition, in FIG. 1, 25 is shown as a flat plate filter, but
It is also possible to use a filter with a lens effect.

The photodetecting element 26 is placed behind the secondary mirror 24', but if it is small, it may be on the same plane as the secondary mirror 24/ or
It is also possible to arrange it in front of 4'.

Furthermore, as shown in FIG. 2, it is also possible to use a filter 35 that has both the functions of a secondary mirror and a reflection filter.

In FIG. 2, first and second lights having different wavelengths are reflected by the primary chain 34. The filter 35 receives the first and second lights reflected by the primary mirror 34, with one light being reflected at the front surface and the other light being transmitted. These lights are detected by detectors 36 and 37 on the same optical axis 41, respectively. The filter 35 has a lens function and increases the focal length of the transmitted light.

When one of the lights is visible light and the other light is infrared light, the filter 25.35 is coated with a film that transmits infrared light and reflects visible light.

Therefore, when using the optical system device for a flying object with the above configuration, each detector can be placed on the same optical axis and on both sides of the filter, so the seeker section of the guided flying object can be made lighter and smaller, and the balance can be improved. good.

[Effects of the Invention] As described above, according to the present invention, when used in a seeker for guided flying objects that uses two wavelength bands and two light detection elements and is configured with a reflective optical system, it is possible to achieve gyrobalance. It is possible to provide an optical system device for a flying object that allows easy arrangement of upper parts, is low in quantity, and is low in price, and can realize a seeker with excellent optical performance.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of an optical system device for a flying object according to the present invention, Fig. 2 is a block diagram showing another embodiment according to the present invention, and Fig. 3 is a block diagram showing a conventional optical system device. It is a block diagram showing the structure of the seeker for guided flying objects used. 1.21... Gyro part, 2, 3, 22, 23... Sombard, 4, 24. 34... Primary mirror, 4', 24'...
Secondary mirror, 5... Guicroic mirror, 6, 7, 2
6.27°36.37... Visible light detection element, 8...
Signal processing circuit, 9.10... Toruca, 11, 31, 4
1...Gyro axis, 25.35...Filter.

Claims (1)

[Claims] a reflecting mirror that reflects first and second lights of different wavelengths; A filter that reflects the second light in a direction opposite to the transmission direction, a first detector that is arranged on the optical axis and detects the light that has passed through the filter, and a first detector that detects the light that is reflected by the filter. A flying object optical system device comprising a second detector.