SU1218407A2 - Device for transforming coordinates of graphic image points - Google Patents

Abstract

The invention makes it possible to increase the accuracy of converting the coordinates of points of a graphic image by introducing focusing elements with a controlled focal distance, optically connected with the additionally introduced second directional source and connected to mobile photodetectors. The focusing elements are provided with spring-loaded ranging distance rings for adjusting the focal distance mechanically coupled with non-compressible filaments with corresponding movable photo receivers. The filaments move along special guiding elements. Opaque screens are also introduced into the device, which exclude optical communication between the scanning mirrors and the moving photodetectors by the beams from the first source of directional radiation. 1 z.p, f, 3 ill. W (L S to 00 4iik

Description

one

The invention relates to automation and computing, can be used for reading graphic information and is an improvement on the known device according to the main author. No. 10784A9.

The aim of the invention is to improve the accuracy of the device.

Figure 1 presents the block diagram of the device; Fig, 2 and 3 - the principle of operation of the device.

The device comprises a tablet, a readout unit 2, a photodetector 3, an optical element 4 (for example, a lens for installing the readout unit at a selected point in the drawing, a computing unit 5, the input of which is connected to the function 6 unit for specifying constants of the functional keyboard 7 and outputs of meters 8 and 9 time intervals , the first directional radiation source 10, located between scanning mirrors 11 and 12, having independent actuators 13 and 14, as well as fixed photodetectors 15 and 16, connected to the first inputs of two meters 8 and 9 time integers vomited.

The information reading unit 2 comprises a base with a pickup element 4, two mobile photodetectors 3 and 17 separated by an opaque screen 18, the outputs of which are connected to the second inputs of time interval meters and the inputs of period meters 19 and 20, the outputs of which are connected to the inputs of the computing unit 5. The base of the readout assembly is associated with the tablet by a mechanism of two-degree translational movement 21 and can freely move around the drawing attached to the tablet. In addition, the device also contains a second source 22 of directional radiation placed between the mirrors 11 and 12. Between this source and each of the mirrors are mounted focusing elements 23, 24, equipped with spring-loaded ranging distance rings for adjusting the focal distance, mechanically connected non-extensible threads 25 , 26 with a corresponding movable photodetector. The threads move along special guiding elements. Opaque screens 27 and 28 are inserted into the device, excluding optical

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What connection is there between mirrors 11, 12 and photoreceivers 3.17 from the rays from source 10.

As focusing elements, for example, photographic lenses with a variable focal length, on a spring-loaded rangefinder ring of which an unstretched thread is wound, can be used.

 The operation of the focusing elements is explained in FIG. The photographic lens 29 (Lig.2) is equipped with a distance measuring ring 30, on which an unstretched thread is wound, passing through

 5 the guide element 31, the ring 30 is spring-loaded either with a spiral torque spring, or a torque motor, or with a load 32 attached to the free end

20 threads 33. The purpose of the spring is to prevent the threads leading to the moving photodetectors from sagging. The device works as follows.

25 The light from the source 10 (FIG. 1) falls on the rotating mirrors 11 and 12, and, reflecting, forms two planes of the sweep. In one there is a photodetector 15 (a photodetector 3 is closed by a screen 27), in the other - 16

(Photodetector 17 is closed by screen 28. Light from the second source 22, falling on the same mirrors, forms two more sweep planes. They are sized

35 are above the first two planes and interact with the photodetectors 3 and 17.

The operator, moving the node 2 reading information, combines

40 element 4 of the optical pickup with the selected point of the drawing, dials in block 7 of the functional keyboard the necessary features and other service information, then pressing

45 of the Start button (conventionally not shown, allows measurement and the start of calculations. I

When the mirrors 11 and 12 are rotated, the light beams hit the photoreceivers and convert the angular distances between the photodetectors 15.3 and 16.17 into proportional time intervals. The results of the measured 55 time intervals and periods in the computing unit are used to calculate the coordinates of the encoded point of the drawing. In the calculations are used con

stantas entered from block 6 of assignment of constants.

When the node 2 moves, the light rays self-focus on the photodetectors 3 and 17 (Fig. 3), if, for example, the node 2 moves from the upper left corner of the tablet to the right lower thread 25, it will move away from the rangefinder ring of the focusing element 23, the focal distance The system will change in such a way that the focusing of the beam from the 22n source is disturbed on the surface of the photodetector 3.

For normal operation of the device, the thread 25 must pass through a guide element mounted along the axis of rotation of the mirror P (the second element is needed to lay the thread on the distance ring J.) Only in this case the lengthening (or shortening) of the thread when node 2 moves along the plate is exactly the required change in the focal distance of the focusing element 23 (only the left half of the device is conventionally shown in FIG. 3, the right works in the same way). If necessary, the thread 25 can be connected to the ranging ring via a reducer, eredatochnoe number is selected properly, namely, at any distance up to the photodetector 3, the beam must be focused precisely on its surface.

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The introduction of focusing systems with a controlled focal length allows for an increase in the accuracy of coordinate conversion for reducing the error caused by the finite dimensions of the cross section of the light rays.

Claims (2)

1. A device for converting the coordinates of points of a graphic image according to author. No. 1078449, characterized in that, in order to ensure accuracy, it contains focusing elements optically coupled to the corresponding scanning mirrors, optical The second source is directional, optically coupled to focusing elements, whose focal length adjustment drives are connected to corresponding movable photoreceivers, while the second and third opaque screens are installed between the scanning mirrors and the moving photoreceivers. 2. A device according to claim I, characterized in that the drive for adjusting the focal distance of the focusing elements is designed as a spring-loaded ranging ring with an unstretched thread wound on it and a guide element. Fig.Z Editor M. Bandura Compiled by T.Nichiporovich Tehred S. Migunova Corrector V.Sinidka Order 1133/57 Edition 673 Subscription VNIIPI State Committee (USSR) for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch PPP Patent, Uzhgorod, Proektna St., 4