RU210728U1 - OPTICAL SYSTEM FOR INDICATOR ON THE WINDSHIELD - Google Patents

Abstract

The utility model relates to the projection technique for displaying information and can be used for on-board indicators on the windshield of a collimator type. The optical system for the indicator on the windshield contains an image source located in the focal plane of the concave mirror, and a selectively reflecting flat mirror installed with an inclination relative to the optical axis of the concave mirror, a combiner made in the form of a selectively reflecting flat mirror, which is installed with an inclination relative to the sighting axis the pupil of the observer's eye. The concave mirror is made in the form of an external reflection mirror. An image source, a concave mirror, a selectively reflective flat mirror, and a combiner are optically interconnected. The technical result consists in improving the quality of the image by increasing the brightness of the image of the outside space and reducing direct and combined glare and reflections that interfere with observation. 3 w.p. f-ly, 1 ill.

Description

The utility model relates to the technology of projection information display systems and can be used mainly for on-board indicators on the windshield of a collimator type.

On-board projection display devices are a system that provides simultaneous observation by the pilot of the real environment, objects in space and the image of the image source, visible through the optical system with a beam-splitting reflector, while the sighting axis of the observer and the optical axis of the image source projection system are combined.

To implement the considered indicator systems, different solutions are known based on one or more reflective/transmitting surfaces (RU 173768 U1, 09/11/2017; RU 2582210 C1, 04/20/2016; RU 2540135 C1, 01/09/2014; RU 2364902 C120.08.2009, RU 63559 U1, 2007; US 8089568 B1, January 3, 2012; US 7602552 B1, October 13, 2009; RU 2226292 C1, March 27, 2004; US 6567014 B1, May 20, 2003; US 5991087 A, 13.17 US.199 1997; US 4669810, 06/02/1987; US 4407564 A, 10/04/1983).

From the patent RU 2364902 C1, IPC G02B 27/18, G02B 27/01, publ. 08/20/2009, a collimator indicator system is known, which belongs to the type of off-axis display systems. The system contains an image source, a projection lens with decentered optical elements and a power combiner, which is a collimator of the image created by the projection lens.

The power combiner selectively reflects the radiation of the image source in a narrow wavelength range and transmits the transmitted light of the visible wavelength range of the environment into the pupillary observation zone. The lenses of the projection objective, which consists of three lens groups and an optical wedge, create an image pre-distortion equal in magnitude and opposite in sign to the distortion that the power combiner introduces into the image. The main disadvantage of the system, as well as other off-axis display systems, is the need to compensate for aberrations that occur during off-axis projection, which leads to a complication of the system, an increase in its dimensions and weight.

Closest to the present invention is a system for displaying on the windshield according to US patent 8089568 B1, IPC G02F 1/1335, publ. 01/03/2012, which refers to axial display systems. The device contains an image source located in the focal plane of a concave semi-transparent mirror - a collimator and an inclined flat semi-transparent mirror, from which the image is reflected onto the collimator. The image collimated by a concave mirror, passing through an inclined translucent mirror, enters the pupil of the observer's eye against the background of the outside environment.

The disadvantage of the device according to patent US 8089568 B1, 2012 is the low light transmission due to the observation of the outside environment through two translucent selective mirrors - concave and inclined flat, which are combiners. This is very critical when using the indicator in low ambient light conditions in the evening and at night. In addition, two combiners create a large number of direct and combined highlights and reflections that interfere with observation. A concave mirror is located on the observer's line of sight perpendicular to his gaze; as a result, the observer sees his own reflection, which interferes with observation.

The present invention is based on solving the problem of improving the quality of the observed image by increasing the brightness of the image of the outside space and reducing direct and combined glare and reflections that interfere with observation.

The problem is solved by the fact that in the optical system for the indicator on the windshield, containing an image source located in the focal plane of the concave mirror, and a selectively reflecting flat mirror mounted with an inclination relative to the optical axis of the concave mirror, according to the utility model, a combiner is introduced, made in in the form of a selectively reflecting flat mirror, which is installed with an inclination relative to the sighting axis of the pupil of the observer's eye, and the concave mirror is made in the form of an external reflection mirror.

The problem is also solved by:

the image source is made in the form of a self-luminous object;

the external reflection mirror is made with a spherical surface;

the external reflection mirror is made with an aspherical surface.

Increasing the brightness of the image of the outside space is ensured by its observation only through one entered combiner. One combiner creates significantly less direct and combined glare and reflections compared to an indicator with two combiners. The combiner is installed obliquely to the sighting axis of observation, which eliminates the reflection of the observer in the combiner.

The utility model is illustrated in the drawing, which shows a block diagram of the optical system for the indicator on the windshield.

The optical system for the indicator on the windshield contains an image source 1 located in the focal plane of the concave mirror 2, a selectively reflecting flat mirror 3 mounted with an inclination relative to the optical axis 4 of the concave mirror 2, a combiner 5 made in the form of a selectively reflecting flat mirror, which is installed with an inclination relative to the sighting axis 6 of the pupil of the eye 7 of the observer.

The image source 1 is a self-luminous object, such as an LCD matrix or a projection screen.

The concave mirror 2 is made in the form of an external (external) reflection mirror [Electronic resource]. URL: https://deafmo.ru/bk_netra/page.php?tutindex=46&index=26 (date of access: 08/01/2021), the inner surface of which is generally aspherical. In a particular case, the concave mirror 2 can be made with a spherical inner surface.

Selective reflection of the elements of the optical system is provided in monochromatic indicators by applying an interference reflective coating designed for a certain wavelength in the green part of the spectrum, usually 520-550 nm. In color indicators, the selective reflection of the elements of the optical system is provided by selective reflection in three regions of the spectrum.

The angles of inclination of the flat mirror 3 and combiner 5 are selected from the condition of their placement in the observer's cabin in the range from 40° to 50°.

The image from the image source 1, reflected from the flat mirror 3, falls on the concave mirror 2. Collimated, due to the location of the image source 1 in the focal plane of the concave mirror 2, the image through the translucent mirror 3 falls on the combiner 5 and, being reflected from it, is projected into pupil of eye 7 of the observer. In this case, the observer through the combiner 5 simultaneously sees the real outside environment. Observation of the real situation only through one combiner 5 provides an increase in the brightness of the image of the outside space. One combiner 5 creates significantly less direct and combined highlights and reflections compared to an indicator with two combiners. Due to the installation of the combiner 5 obliquely to the sighting axis 6 of observation, there is no reflection of the observer in the combiner.

The proposed system is axial, therefore, such types of image aberrations as image field curvature and trapezoidal distortion do not occur in it, which eliminates the need to use an aberration corrector.

Thus, the proposed indicator on the windshield provides, with good quality, simultaneous observation of the outside environment and an image superimposed on it with the necessary information.

Claims (4)

1. An optical system for an indicator on the windshield, containing an image source located in the focal plane of the concave mirror, and a selectively reflecting flat mirror mounted with an inclination relative to the optical axis of the concave mirror, characterized in that a combiner is introduced, made in the form of a selectively reflecting flat mirror , which is installed with an inclination relative to the sighting axis of the pupil of the observer's eye, and the concave mirror is made in the form of an external reflection mirror, while the image source, the concave mirror, the selectively reflecting flat mirror and the combiner are optically interconnected. 2. The optical system according to claim 1, characterized in that the image source is made in the form of a self-luminous object. 3. The optical system according to claim 1, characterized in that the external reflection mirror is made with a spherical surface. 4. The optical system according to claim 1, characterized in that the external reflection mirror is made with an aspherical surface.

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