DE2214868C2 - Light drawing head with a movable slide - Google Patents

Description

th drive, the desired object in the subject can be found in the subclaims.

Imaging beam path brought. 50 men.

Such light signal heads operate with a simple The invention is described below with reference to a in

merically controlled drawing machine together, the drawing schematically illustrated execution

where a light-sensitive drawing carrier is explained in more detail. It shows

is turned. F i g. 1 part of a light drawing head that

The accuracy of the 55 slide with drive motor on the drawing carrier,

The drawing provided is a section of the slide with both the positioning Fig. 2

accuracy of the drawing machine, as well as that of a mark and a scanning device that clicks on the

Position accuracy of the drive motor and another motor on the drawing,

brought the photo of the traffic light device. F i g. 3 a formation of the scanned mark

give. 60 of the slide,

In the case of complex, geometric structures with un- F i g. 4 another training of this brand,

different line widths and different f i g. 5 the stock correction by controlling the

Symbols must be a plurality of on the object drawing machine.

objects located in the carrier of the light drawing head For the sake of clarity, the

can be used. The introduction of the objects 65 F i g. 1 of the light drawing head according to the invention

in the optical beam path of the light drawing scope only the disc-shaped slide 1 with some

fes is program-controlled. translucent objects 2 shown by

In order to be able to produce very precise drawings - a motor 3, which can be a stepper motor,

is driven. Be formed in the optical beam path 20 mig. The ^ J ^^ sSSeL Die (Fig. 2) is each one of the objects !. nung «J ^ Satttoik of the periphery (ge-This training is known. Brand 4« 'J ^ _t f _d "Pfaoto -detektoren-Anord-

If in the beam path 20 the centers of the dashed lines ^ p * ¹ ! "*: '"",,. _Only for a small other introduced object 2 do not coincide, then 5 and the ^L1 5 °" ^ ". _photo _Detectors.

are those on the light-sensitive drawing carrier TeU of the ^ ^üv £ ⁿ V ^ n ^ ^^ _{equal] icht} . projected light images shifted from one another through the ^üm £? t. c_ _in ! _Sentences are enough

(Center offset). Γ ^? / ^ Deviation of one in the radiation

According to the invention, each object 2 has a correction close to *? Jf8 ^ £ JJes ₂ ⁶ _therefore only assigned to two brands4 which are the most important of these. This assignment, located object2 J ^, ^

voltage obj2 and Marke4 is very accurate possible Ρ ^ ^θ6 _"3Ξ η 18 'signal voltages-iiCH ⁸ THe marks 4 are in the descriptions ^Giving up the" J f / ^^ dS a radial? Position error

Introduction to the exercise mentioned template in the production from, ^ * ° &? & £ * ₄ assigned and applied to the slide so that there is an eme £ todg »« * »™ £ ^ o _b f _ectes 2. The unchangeable assignment results. * 5 im ^St i ^ahIengW * r ^ iSn the differential amplification

As shown in FIG. 2, the mark 4 of the Jigpiatapaiimijffn JJ _nd the polarity of the object located in the beam path 2 a scanning ker9 an ^ ^{aer εη} ^ * 7 _{0 controls in such a way} that an arrangement is assigned that consists of a light source 5, f ^ f ^^ S ^ n or shortened, whereby a converging lens 6 and a position sensitive ^ ^{del 1S} ^ ^a ^ . Direction of arrow shunted Photo-detector arrangement? exists whose Si- «. the ^M i ^ 5 ° S ™ £ which are guided in the beam path signals to two amplifiers 8.9. ben w nd1 and_thus also ^ as ^ ^ _g .

As shown in FIG. 1 can be seen, the motor 3 is located on object 2 undirwM '* _g , _Nu "

attached to a pivot arm 11, which is rotatably mounted at point 12 in the signal voltage η of the photo-J * «gJe position error of the double arrow direction. The modern day DamU J ^ 5 ^ 5 * & (* -R «itor 3 has a projection 13 on which a wide a ₅ fixed motor 10, which is fixed in the beam path, engages. The ^^ / ^. F'f ^ ^ o.netectors 18 signal voltages projection 13 is over a spring 14 against giving the J ^^^ Jjüuissittaler position error

Motor 10 ^b pressed. The rotating part of the motor 10 is off, so the object 2 is designed as a spindle 15, the head 16 of which presses against the one of the differing projection 13 of the motor 3. If the motor 30 is present, the signal voltage _{circuit is present}

Excite 10, so the spindle 15 either manufacturing ^"nv ^ ^ta is ^{r. ke} _n ^r _B ⁸ Ä ^ 3 harbors. Unscrewed the Wicklungsein- or and of the slide 1, the ^WXC "^ ₃ J ^ ^M ° 5dam rotates the shaft driving Engine3 in the Tangantialrichtung r loading current is f ^. ™ ^ _™ β ε ΐ 3β. Moved accordingly. The motor 3 for the slide 1 is driven by the motor * 3 for a weeping Be J ν _fa amplifier 8 and the motor 10 by the amplifier 9 is vertical

Fig.3 shows the mark 4 quadra- ^ SSSU ^^^^

si iiss ^^ ^ HH ^{beam path is} "

18 'are arranged. The signals of the two opposing 40 ^lic 5f. ⁿ 9 ^bje _r ^ _a fen Jnd taneential I position deviation

overlying photo detectors 18 are at the M- ^% ££? ££ & _the S-Detekto ^ 18, 18 '

reference amplifierS (Fig. 2) and the signals of the f ^ ¹ ^^^^^! »*, adttele Ana-

two opposite photo detectors 18 ^ "'. ^ m ^ Sl 52 also in digital posi-

are fed to the differential amplifier 9. The log DigittJ "" ™ ***! '1J _{will be} a numerical

The size of the difference is a measure of the positional deviation 45 ^ "^^^ f ^ SS ^ San. The digital

hen chung of itself befindh- just in the beam path 20 ': ^^ f ^ ^{3 1} umsttm be here with

four acSven areas of Pho.o-De.eku, ™ 18, 18 ' %? ££% £ & £ £ S i! ch.! possible = n

üe brand 4 too

1 sheet of drawings

Claims (4)

1 2 ... nen, a very high positional accuracy of the ob- Patent claims:. ^ To each other or to a common 1. Light drawing head with a movable traction point, otherwise when changing the object carrier, on which there is a multitude of light from objects eli center offset of the objects, permeable objects in the form of points 5 which is applied to the drawing and symbols by the light drawing head that affects the light image projected from a plane.
Light source is shone through and on a light- There are known microscope slides which are vaporized with a sensitive drawing carrier, in which the objects (2) a discriminator (4, 7) are assigned io. Positional errors of the objects can now occur in the case of a positional deviation of the object (2) located in the beam production of the specimen slide and its position (20) from its position. The objects are generated at the target position error signals (18, 18 '), the production of the object slide from an enlarged template to correct the deviation of the object (2) is projected onto the support and exposed. serve. 15 Position errors can already occur during the manufacture of the 2. Light drawing head according to claim 1, there template occur. Are template and slide characterized in that the discriminator is not very precisely aligned with one another, so result the objects (2) assigned markings (4) result in further positional errors. Also due to inaccuracy and one of these positionally sensitive scanning of the setting of the specimen slide in the case of the Aufbc arrangement (?) exists, errors can occur with the clearing in the ao. With disc-shaped Beam path (20) located object (2) correct object carriers that sit on a motor shaft, lates. occur if the disc is not precisely centered 3. Light drawing head according to claim 1 and 2, also positional errors. As mentioned above, result in characterized in that the error signals are further positional errors due to the positioning of the (18, 18 ') Actual value signals from two control loops as the slide. are, the actuators (8, 9) the slide So far, the procedure has been that the (1) According to the positional deviation of the measured in the error of the slide and converted into a Ts- Beam path located object (2) were entered in two belle. Each object has a \ x- move different directions (X, Y) . and Λ assigned to the y-error value, which the object call- 4. Light drawing head according to claim 1 and 2, 30 fen assigned in a computer memory Gegebui characterized in that the error signals are. If an object is called up, its (18, 18 ') is converted into digital position units by means of an analog-digital converter (51, error value with the assigned position setpoint · 52) Numerical control calculates program values. This method (P) of a drawing machine (54) controlling 35 requires considerable programming work, in which the numerical control (53) is supplied. especially when changing the slide. The invention has for its object to be a To create light drawing head with a slide, by the opposite known light signal 40 behead a higher positional accuracy of it The invention relates to a light sign- the image projected onto the plane of the drawing is reached,
head with a movable slide on which this object is achieved according to the invention by geeine a large number of translucent objects in that the objects are assigned a discriminator in the form of circular or angular points and which, if there is a positional deviation of the symbols such as numbers, letters and the like in the beam path. The object located on the object is wrong from its desired position, which is transilluminated by a light source and generates lersignaie which are used to correct the deviation and which are used on a light-sensitive drawing support of the object. can be mapped. By means of a program-controlled expedient further developments of the invention