DE1805097B2 - Arrangement for generating coordinate signals corresponding to the displacements of a freely movable stylus in a writing plane - Google Patents

Description

The invention relates to an arrangement for generating the dislocations of a freely movable Stylus in a writing plane corresponding coordinate signals, in which for each to be scanned Coordinate direction a light source is provided, which is a parallel to the writing plane, Narrowly limited light beam generated, which an at least virtual cyclical deflection movement in the

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coordinate direction to be scanned is granted, there are practically no restrictions with regard to

which furthermore each light source is a photoelectric one of the dimensions of the writing plane, and it is without

Scanner is assigned to which the light beam is also possible to cover the entire writing plane,

meets and that each time the light hits, because reflection is used, the photo-elec-

bunch on the stylus caused brightness- 5-tric scanner each on the same side of the

jump emits a signal, and at which, finally, writing level such as that generating the light bundle

to the outputs of the photoelectric scanners electrical and deflecting devices, so that the rest

tric circuits are connected, which the pages of the writing level are freely accessible.

Coordinate signals from the

jumps of the light bundle caused fluctuations io is that at the lower end of the pen a

reflecting the output signals of the photoelectric scanner-reflecting autocollimator device attached

conduct. is that each light beam is in the direction of incidence

An arrangement of this type is particularly suitable for throwing back.

In this embodiment, only the photo formations are needed enter the 15 electric scanner with the help of the stylus permanently in the axis of the light the writing plane. to be held in league to ensure

From US-PS 3,128,340 discloses an arrangement of he front of the reflected light beams hit the initially indicated type is known, which is used as a facsimile. This can be achieved in a simple way, schreiber serves. In this known arrangement, for example, in that it is connected to the deflection device for the light sources generating the light bundles in the direction for the light bundle, or deflection or deflection elements and the associated photoelectrical elements are driven together with the latter,
tric scanner on opposite sides An embodiment of the invention is a schematic writing plane, so that each scanner is shown in the drawing.
constantly receives the bundle of light, except when the drawing has a rectangular table for a brief moment in which it is broken up by the stylus with two coordinate axes X and Y. Of course. In one embodiment, any other, non-Cartesian coordinate can also be given to a narrowly delimited light beam a system of pivoting movement provided with more than two coordinates in an angular range.

the assigned photoelectric output must be. Each point P, whose coordinates are automatically assigned

button transmitted over the entire length of the corresponding side 30 of the calculating machine (not shown)

the writing plane extend; in the case of a different evacuation, this can be implemented by means of a stylus 2

form of management, in which a along one side of the will be an operator for this purpose

Writing plane wandering light point is generated, holds essentially vertically and on the table 1

Although the photoelectric scanner can be small, it aligns. At the one facing the table. End of this

but in this case a light source (in particular, stylus is a reflective optical autocollimator

cathode ray tube), which is attached over the device, for example an arrangement

entire length of the corresponding side of the writing of small balls or pearls on a support

plane extends. Both solutions are very complex; ger taped around that end. Each on one

Furthermore, since the extension of elongated foloelek- such device incident light beam is in

tric scanner or cathode ray tubes thrown back from tech- 40 the direction of incidence,

A coherent light-generating light source 3 is suitable for ecological reasons

These solutions are preferred, but not necessarily, only for writing levels of very

limited dimensions. This is always the case with a laser that emits a very fine and very little divergent

stroked scanning field emits only a fraction of the monochromatic light beam,

level. After all, it is often annoying when it is used

rend that on all four sides of the writing plane there is an optical path, one behind the other

optical or photoelectric parts are present. first, semi-reflective mirror 4 and a two-

The invention is based on the object of a totally reflecting mirror 5 containing. This with arrangement Mirrors of the type specified at the beginning are inclined, for example, by 45 ° and fen, the large dimensions 50 with a simple structure thus cause the formation of two secondary bundles Scanning field allows. yours of essentially the same light intensity,

According to the invention, this is achieved by impinging on two further mirrors 6 and 7,

that the stylus with reflective optical equip- These two mirrors that are flat and semi-transparent

lines, which can be any incident light, are at such an angle to the

reflect the bundle in the direction in which the horizontal line is inclined so that it hits it

This light bundle associated photoelectric down light bundles reflect continuously in a plane which

button lies. is parallel to the horizontal plane of the table 1.

The arrangement according to the invention results in the we- Since the incident light bundle essentially

The fact that each photoelectric scanner runs vertically on the train results in an inclination of about

arranged light bundles only in the short 60 45 ° for these mirrors 6 and 7.

The moment when it is deflected, the mirrors 6 and 7 are not shown by a

Movement hits the stylus and from this to the provided suitable device, for example, in a

Scanner is reflected. Both the rotating movement, which continues the light beam, is offset. It could be them

generating optical devices as well as a reciprocating oscillating movement

photoelectric scanners only need to be given the approval. In both cases, paint each one

Cross-section of the light bundle corresponding to the light bundles reflected by the mirrors 6 and 7

to have measurements. These parts can therefore mh del a plane that is parallel to the plane of the table and

be designed with little effort. On the other hand, lies at a small distance from this. This is the

Scanning the table surface by two crossed Y ₀ the ordinate of the origin, as in the drawing

Light bundle guaranteed. indicated, with Ct ₁ the angle at which the

Two receivers or scanners 14 and 15, seen at point P from the center of the mirror 7

for example photomultiplier cells, are fixed with the will and finally with a ₂ the angle at which

Mirror 6 or 7 connected and adjusted so that 5 brazen point P from the center of mirror 6

it is seen through these mirrors at any point in time, the coordinates are

receive the reflected light beams, as naten X and Y of the point P by the following

will be explained in more detail later. Given equations:

Furthermore, with each mirror 6 or 7, an angular

position encoder 8 or 9 connected in such a way that it starts with ίο χ _ tg a ₂ · D ₀ ^,

the mirror in question is adjusted. This Codie tga, + tga, ^0>

rer deliver continuously or at least almost continuously

Signals representing the values of the angle or the _ tg Ct ₁ - ^ a ₂ η —Y n \

Specify the tangent of the angle through the eye ^r ~~ _t , _t "' ^υ ο ^r o · \ ² )

Viewing position of the mirrors 6 and 7 with a reference »5 S 1 B 2

plane is formed, which, for example, simply the It can be seen that this calculation is direct

Can be plane through which the center points can be programmed for a calculating machine. this

The straight line connecting mirrors goes. would hold for all other equations as well, with

The outputs of the samplers 14 and 15 are the values X with the parameters corresponding to those from

Inputs of amplifiers 16 and 17 connected, 20 and Y calculated from angles or angle functions

and the outputs of these amplifiers can be matched with those stored in registers 10 and 11.

Control inputs of transfer control stages 12 and are drawn.

13, the signal inputs of which are connected to the outputs.

the encoder 8 or 9 are connected, while tion potentiometers are replaced, which analog

their outputs with the inputs of registers 10 25 emit voltages, which the angle or the Tan-

and 11 are connected, which represent, for example, the gens of the angles. In this case it will be

Input register of the arithmetic logic unit (not shown) - registers 10 and 11 replaced by analog memories,

machine or external memory of these arithmetic units whose content is processed by suitable analog arithmetic units

machine can be. A transmission control stage works before it is converted into analog-to-digital

is opened every time a scanner is re-assigned in a manner known per se in such a way that

is clearing. that the coded values of the coordinates X and Y

If those reflected by mirrors 6 and 7 can be entered into the calculating machine. Beams of light are not an obstacle during their scanning movement. When encountering the embodiment just described on the table, they have no effect on the game, of course, different technological scanners can exert. However, if the stylus is made on the 35 amendments. For example, a table is directed, the attached reflector throws as many light sources 3 provided evaluating optical autocollimator device which, like light bundles for scanning the table, are returned to the mirrors 6 and 7 and are to be used. The encoder or potential of this light passes through the mirror to the meter, code tracks can also only be on a part of scanners 14 and 15. This means that the transmissions 40 have their circulation, since the usable scanning is opened, and the registers 10 and only one proportionately small angle. 11 receive the code signals for the position of the mirrors 6 and 7 can be opaque and encoders at the relevant point in time, that is, they are arched, whereby they then have openings, values of the angles which the light bundles reflected by the mirrors 6 so that the photoelectri- and 7 incoming light bundles with which the (fixed 45 see scanner can be reached. Furthermore, the moving) center points of these mirrors connecting mirrors can be completely or partially replaced by prisms enclose a line or, more precisely, the values of the tan, etc.
gens this angle. It should be emphasized that the use of

These data are fed into the calculating machine and laser light sources are particularly advantageous for the results and, if necessary, processed there in order to find them, because the radiant energy of the light source in the Cartesian coordinates X and Y of the point must be sufficiently large so that the tes P with respect to the origin of the table to deform passage through the mirrors and / or prisms. If with D ₀ the distance between the mitigated attenuation of the light does not affect the effective points of the mirror, with X ₀ the abscissa and with wise the device

1 sheet of drawings

Claims (16)

Patent claims: 1. Arrangement for generating the dislocations of a freely movable stylus in an S. Coordinate signals corresponding to the writing plane, in which for each coordinate direction to be scanned a light source is provided, which is a parallel to the writing plane, narrow Limited light beam generated, which an at least virtual cyclical deflection movement in the to be scanned coordinate direction is given, in which each light source is also a photoelectric Is assigned to the scanner on which the light beam strikes and that of each of the strikes the light beam on the stylus caused a jump in brightness emits a signal, and in which, finally, electrical circuits are connected to the outputs of the photoelectric scanner are which the coordinate signals ao from the through the brightness jumps of the light bundle derive caused fluctuations in the output signals of the photoelectric scanner, characterized in that the stylus (2) with reflective optical Einrich- as lines is provided, which reflect each incident light beam in the direction in which the photoelectric scanner (14, 15) assigned to this light beam is located. 2. Arrangement according to claim 1, characterized in that at the lower end of the stylus (2) a reflective autocollimator device is attached which captures each light beam in the Throws back the direction of incidence. 3. Arrangement according to claim 2, characterized in that for generating the deflecting movement adjustable reflective optical deflection elements (6, 7) are provided for the light bundle which are controlled in common for the deflection, and that the photoelectric scanners (14, 15) are driven together with the optical deflection elements (6, 7) in such a way that that they always lie in the axis of the light beam in question. 4. Arrangement according to claim 3, characterized in that the optical deflection elements (6, 7) are semi-transparent and that the photoelectric scanners (14, 15) that of the autocollimator device reflected light through the semi-transparent deflectors (6,7) receive. 5. Arrangement according to claim 3, characterized in that the optical deflection elements (6, 7) have an opening and that the photoelectric Scanner (14, 15) the reflected from the autocollimator light through the receiving opening through. 6. Arrangement according to one of claims 3 to 5, characterized in that the each The light beam gave a cyclical deflection movement in the direction of a pivoting movement Coordinate axis of the writing plane (1) is. 7. Arrangement according to one of claims 3 to 6, characterized in that with each optical deflection element (6,7) a position transmitter (8, 9) is connected, which at least temporarily Generates signals that are characteristic of the angular position of the relevant deflection element (6, 7) are, and that at the outputs of each position transmitter (8, 9) a transmission control stage (12, 13) is connected, which by an exposure of the associated fotoelektriscnen scanner (14, 15) by the light reflected from the pen (2) control signal for the Transmission of the current output signal of the corresponding position transmitter (8, 9) open will. 8. Arrangement according to claim 7, characterized in that the position transmitter (8, 9) numerical Coders are. 9. Arrangement according to claim 8, characterized in that daS at the outputs of each transmission control stage (12, 13) a digital register (10, 11) is connected as a buffer. 10. Arrangement according to claim 7, characterized in that that the position transmitter (8,9) are analog function potentiometers. 11. Arrangement according to claim 10, characterized in that that an analog memory (10, 11) is connected to the outputs of each transmission control stage (12, 13). 12. Arrangement according to one of claims 3 up to 11, characterized in that the light bundles are incident on the optical deflection elements (6, 7) impinge in a direction which is substantially perpendicular to the writing plane (1), and that the optical deflection elements (6, 7) are designed so that they the light beam in a substantially reflect the plane lying parallel to the writing plane (1) in every angular position, which the optical deflection elements (6, 7) is given by their drive. 13. Arrangement according to claim 12, characterized in that the optical deflection elements (6, 7) set in a rotary movement about an axis perpendicular to the writing plane will. 14. Arrangement according to claim 12, characterized in that the optical deflection elements (6, 7) issued an oscillating movement about an axis perpendicular to the writing plane will. 15. Anc 'arrangement according to one of the preceding Ansbach ücr.e, characterized in that the LICHTBUER: "i.' -One a single light source (3) come uuj by optical means (4,5) generates w - ^ n. , which distribute the light energy of the light source essentially evenly to the light bundles. 16. Arrangement according to one of the preceding claims, characterized in that the Light bundles are generated by a coherent light source (3) of the laser type.