SU640337A1 - Device for visual displaying of information - Google Patents

Description

one

The invention relates to the field of automation and computer technology and is intended for use in information output systems.

The known device for visual display of information does not allow for the correction on the screen of the positions of all points of the projected slide, which reduces the accuracy and reliability of the device 1.

The closest technical solution to the invention is a device for visualizing information, containing a projector with a slide installed in it, on the edges of which reference and control markers are applied, and error photosensors mounted on the screen in the projection zones of control markers, in which there is no possibility of elimination errors in the application of graphic information to the carrier and errors due to the deformation of the latter, and it has a low sensitivity, which also reduces the accuracy l work and the power of the device 2.

The difference with the described device is that it contains a mirror mounted on an elastic base and optically connected to the projector and screen, an additional photo sensor mounted on

the comparators, the first inputs of which are connected to the output of the additional photosensor, and the second to the outputs of the corresponding error photosensors, and the actuators connected kinematically to the elastic base of the mirror at the reflection points of the corresponding control markers, and the input of each actuator connected with the output of the corresponding room.

This improves the accuracy and reliability of the device.

The drawing shows a block diagram of the proposed raeiMoro device.

The OIO contains an optical projector 1 that includes an illuminator, a projection lens and a personnel window with a slide having control markers, a mirror 2 on an elastically deformable base, a screen 3, photosensors 4 errors, an additional photosensor 5 (luminous flux), source 6 of the base signal, comparators 7, amplifiers 8, used mechanisms

9 base deformation with a mirror.

The projector 1 through the mirror 2 is optically coupled to the nano-mirror 3. The photosensors 4 are installed on the screen, the inputs of which are connected through

a mirror 2 with the projector 1, as well as a photo sensor for the luminous flux 5, which is likewise associated with the projector. The electrical output of the photocell stream 5 is connected to the input of the source 6 of the base signal, and the output of the latter is connected to the second inputs of all comparators 7, the first inputs of which are connected to the outputs of the corresponding photosensors 4 errors, and their outputs are connected to the inputs of amplifiers 8. The outputs of the amplifiers are connected to the inputs of the corresponding actuators 9. The outputs of the mechanisms are connected to points of the mirror in the areas reflecting the images of control points (markers) of the transparency.

The mirror has a base, made in the form of an elastically deformable plate of variable thickness, ensuring the constancy of the radius of curvature of the plate in the plane of application on its boundary of the transverse force.

The center of an elastically deformable plate (base) with a mirror 2 is hinged on the fixed base of the device body.

The device works as follows.

In the ideal case, when the errors of the transparency and optics are absent, the images of special marker shapes, located in predetermined places on the transparency, are projected using the projector 1 and the flat mirror 2 on certain places of the screen 3. In these places are placed the photosensors 4 errors, which fall in this case, the light fluxes passing through the central parts of the corresponding marker images. The output signals of the photosensors 4 errors are proportional to the magnitudes of the light flux incident on them.

To isolate the mismatch signals from sensors 4 and eliminate the dependence of the operation of the circuit on the magnitude of the luminous flux, an additional photo sensor 5 (luminous flux) is placed on screen 3, onto which the image of a special marker of the diaospositive controlling its illumination is projected. The output voltage from the photocell of the luminous flux 5 is fed to the input of the source of the base signal 6. Comparators 7 receive signals from the photosensors 4 errors and from the output of the source of the base signal 6. These values are stopped so that in the ideal case under consideration they are equal to each other, as a result at the outputs of the comparators 7, and therefore, the pa outputs of the amplifiers 8 connected in series with them, the voltages are equal to zero. Znp zero signal at the input of the mechanism 9 connected to the output of the amplifier 8, the mechanical force and its output is also equal to the force.

The shape of the marker shapes projected on the photosensors 4 errors, and the shape of the inlet of the photosensor 4 are such that shifting the image of the marker relative to the photosensor leads to a change in its output signal. For example, with a triangular shape of a marker and a slit shape of a photosensor 4, the image is shifted to one side along a single bisector

marker angle leads to an increase as well. in the opposite direction - to reduce the output signal of the photosensor 4 errors.

On the contrary, the marker of the light flux and the inlet of the photosensor of the light

the flux 5 is chosen so that over a wide range of marker deviations, the luminous flux falling on the sensor 5 remains constant (eg, if the mark) and the aperture are round or square,

The diameter of a round marker or the side of its square is much larger than the corresponding parameters of the photosensor inlet 5).

The orientation of the markers on the slide and

the phasing of sensors 4, comparators 7, amplifiers 8 and actuators 9 are such that they form a negative feedback circuit, i.e. the deviation of the marker image on screen 3 causes

ultimately, the signal at the output of mechanism 9 (displacement or force, depending on its type), which tends by turning the mirror 2 to return the image of the marker to an equilibrium state.

From the analysis of possible sources of errors of the slide and the projection, it is possible to establish trn of the main group of deviations of the image of markers relative to the photosensors of errors:

a) all images are shifted relative to the photosensors to the side by the same magnitude;

b) marker images are shifted symmetrically relative to the center of the screen;

c) marker images are shifted relative to the sensors in different directions and at different distances.

It is easy to see that the first case is a consequence of simply shifting the slide or screen 2 from the optical axis of the projection. Correction of this error is achieved by rotating the plane of the mirror 2 by any of the known methods or with the help of actuating mechanisms 9.

The second case is a result of large scale distortions (the error in the magnification ratio of the projector) and can be eliminated by known methods, for example, changing the distance from projector 1 to screen 3, followed by adjusting the focus, or using a variable focal length lens. This kind of distortion is more convenient to remove with the help of this device, so

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