SU943827A1 - Indicator - Google Patents

Description

(54 / INDICATOR

The invention relates to a display technique and can be used in aviation, in signal panels, according to which the crew controls the operation modes of the onboard systems.

A known indicator with adjustable luminous flux, containing a light source, a diffusing light filter, a block for adjusting the spark flux, made in the form of two plates, covered with a floor with a x-film film 1.

The drawbacks of the device are the complexity and large size, limiting its use in aviation signaling.

The closest in technical essence to the proposed iy is an indicator comprising a housing in which a light source and a diffraction grating are installed, the central strokes of which are symmetrical with respect to the optical axis, and a light filter, a storage medium and a screen 2 are sequentially installed in the housing window.

Its disadvantage is the low resolution when changing ambient light, which makes it difficult to use it as an aircraft signal panel.

The purpose of the invention is to increase the resolution of the indicator in the conditions of changing external illumination.

The goal is achieved by the fact that an indicator comprising a housing within which a light source and a diffraction diffraction light are installed. a screen, and a light filter, an information carrier and a screen are installed in the housing window, reflectors installed on the side walls of the housing and a diaphragm made in the form of a movable shutter, with a diffraction grating and movable curtain mounted inside the housing between the light source and the light filter in one plane, with the possibility of overlapping half of the light flux and fixed on the side walls of the housing in the places where the reflectors are installed, and the mutually perpendicular strokes of the lattice have a pitch

b - b

25

cos -icL

center of the lattice where b is the first step from

ki stroke;

d is the angle of deflection of the light source beam from the center of the grating to the previous igggriha. Fig. 1 is a schematic diagram of the indicator; 2, a grid construction scheme. The device comprises a housing 1, a light source 2, a diffraction grating 3, a light filter 4, a screen 5, an information carrier b, a reflector 7 and a movable shutter 8. A light source 2 is mounted on the longitudinal axis Kojinyca 1. At some distance, depending From the design of the indicator, from the light source 2, a diffraction grating 3 is installed normally to the longitudinal axis of the housing 1, overlapping half of the illumination window from the longitudinal axis to the housing 1. At a distance depending on the period of the diffraction grating 3, a light filter 4 and screen 5, int kotormi information carrier placed on the cotton with worn thereon mnemoizobrazheni mi mi and inscriptions. Between the diffraction grating, the 3rd light filter 4 at the intersection of the diffraction grating 3 with the side of the housing 1 and at the intersection of the plane of the diffraction grating 3 with the opposite lateral side of the housing 1 are fixed reflectors 7 so that the reflected light from the reflector 7 closed from the source The nickname of light 2 of the diffraction grating 3 would come to the half of the light filter 4 uncovered from the light source, and the reflected light from another reflector uncovered by the diffraction grating 3 from the light source 2 would come to closed from the light source 3 that the diffraction grating filter half 4. On the opposite from the grating 3 side of the housing 1 through the slot introduced movable shutter 8, which may be set in any intermediate position from fully open to fully closed the illumination window. In the indicator, for equal transmittance of light on the entire surface of diffraction grating 3, the grid is made in the form of mutually perpendicular stripes of equal width, and to ensure uniform illumination of the surface of filter 4, the width in transparent gaps of the diffraction grating 3 is variable, and is chosen from the condition of transmission of equal flows - light through each transparent gap. These conditions are satisfied when the angular size of the transparent gaps of the grating 3 is equal. But from the source 2 the rays of light pass through the diffraction grating. 3 under different nodes / (FIG. 2), therefore, at constant angular dimensions of the transparent gaps of the diffraction grating 3, their linear dimensions change with a change in the angle of deviation from the normal to the plane of the diffraction grating 3. The distance from the point source of light is 2 o the diffraction grating 3 is equal to 6, the linear size of the transparent pro-stripe is equal to в, and its angular gap is equal to p, you can determine: b tg PI I where fi const, When the beam deviates from the normal to the grating plane by an angle of 4ABO, it is determined; Sozog From ABC it is determined: AF AB. tg (1;. tg /}, from LVSR: BC fJE2JL. -C cosot-sin (90-eL- | i- / sin (90-o (-fb) can be found: from the relation tof bD COSd-Sin (90 -ti- () t 6-ta (b COSoL-Sin t90-oL- (b) Considering that / fj is small, we can assume: 1 b cosd-sin (90-d) cosoL-cosoL 1, cosioL Accepted BD b, is: b Thus, the width of the transparent gaps of the diffraction grating 3 should vary from the central axis of the periphery to the b / so5 law. The device works as follows. Part of the luminous flux from source 2 enters the part 3 uncovered by the diffraction grating the light filter 4 and the reflector 7. Reflected from the unclosed reflector 7 light Oh, the stream enters the 3 part of the light filter closed by the diffraction grating 3. Simultaneously, another part of the light flux of the point source 2 enters the diffraction grating 3, where, breaking into elementary light fluxes, it enters the closed part of the filter 4 and the reflector 7. Reflected from the closed reflector 7 the light fluxes arrive at the uncovered by the diffraction grating 3 part of the light filter 4. The elementary light fluxes / coming from the diffraction grating 3, having sharply resolved maxima, provide contrast - illumination, and the light flux direct from the source 2 and reflected from the reflectors 7 ensure uniform illumination. The total luminous flux, having passed through the light filter 4, projects an image of mnemonic words or inscriptions printed by the information carrier.

Claims (2)

Claim 1. An indicator comprising a housing, inside which a light source and a diffraction grating are installed, and a filter, a storage medium and a screen are installed in series in the housing window, characterized in that, in order to increase the resolution of the indicator, reflectors mounted on the side walls are inserted into it housing, and a diaphragm made in the form of a movable curtain, moreover, the diffraction grating and the movable curtain are installed inside the housing between the light source and the filter in the same plane, with the possibility of overlapping Ia half of the luminous flux, and are fixed to the side walls of the housing in places reflectors. 2. The indicator according to claim. ^ Characterized in that the mutually perpendicular strokes of the lattice have a step and '- ^b cosset' where b is the mat of the first stroke from the center of the lattice; d. - the angle of deviation of the beam of the light source from the center of the grating to the previous stroke a ,. • Sources of information) ’taken into account in the examination 1. USSR copyright certificate No. 289254, cl. F 21 L 15/20, 1969. 2. Copyright certificate of the USSR ₂ - No. 398910, cl. G 02 B 27/38, 1971 (prototype).