DE1218744B - Display device for the analog display of measured values digitally transmitted in a (mú½n) -digit binary code - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY Int. α .:

GOId

GERMAN

OUTL

PATENT OFFICE.

CHRIFT 1218 744 German class: 42 d-2/50

Number: 1218 744

File number: . St 20857IX b / 42 d

Filing date: July 11, 1963

Opening day: June 8, 1966

The invention relates to a display device for direct optical display in binary code digitally transmitted measured values, in particular for remote display of bearing values.

The remote transmission of measured values in analog representation is increasing Dimensions through digital transmission processes, as these alone provide the accuracy and Have operational reliability and susceptibility to failure. The measured values to be transmitted in each case are therefore initially binary coded and the individual codes transmitted simultaneously or one after the other, The accuracy of the transmission or display is practically only given by the gradation of the coding is. The incoming impulses may be regenerated and stored at the receiving location, so that all code elements are available for display at the same time.

The transmitted measured value can now be z. B. after a conversion back to the decimal system by means of ao Number tubes are displayed. In many cases, however, this representation is not satisfactory, but it is z. B. desired for the sake of clarity a display on a scale, so that the digital the displayed measured values must be converted into an analog display. This task occurs for example in the remote transmission of bearing angle values. To solve this problem are various proposals have already become known; One of the well-known methods is digital Measured values converted into an analog quantity and displayed in an analog display device, such as B. phase meter, Light coordinate indicator, cathode ray tube or the like. Displayed. The effort required here as well as the demands on the accuracy of the analog display are very great. With another known method, the digital values are converted into a graduated analogue displayed on a scale Value converted. In a display device developed and known for this purpose, the decoding takes place and the display of the digitally transmitted measured values simultaneously by the display device itself. However, the disadvantage of such arrangements is the relatively high mechanical complexity and the poor display with fluctuating display values as well as the difficulty with the optional addition smaller Angular values and finally the limited resolution due to the limited number of codes.

The present invention is based on the principles of the two methods listed Made use of; the general solution idea display device for analog display of

in an (m + n) -digit binary code digital

transmitted measured values

Applicant:

Standard Elektrik Lorenz Aktiengesellschaft,

Stuttgart-Zuffenhausen, Hellmuth-Hirth-Str. 42

Named as inventor:
Wolfgang Smitka, Pforzheim

thus represents a combination of a digital and an analog operating display part. Starting from an (m + n) -digit binary code, according to the invention 2 ^m are arranged along the scale extension and each assigned to one of the 2 ^m measured values and are connected to each other with light chambers of the same size, whose x-th chamber ^{is controlled by the 2 x} th (m ^ x ^ O) value and made to light up, a multiple diaphragm covering all light chambers and continuously movable in the direction of the scale with one contactor per light chamber, the width of which is significantly smaller than the chamber width , as well as means for converting the 2 "values into a control voltage, which is used to shift the multiple diaphragm by the distance z. (O ^ Lz ^ k) according to the ^{value 2 y} (0 <Ly <Lri) by means of a servomechanism it is specified that the m digits contain the code elements of higher significance, i.e. the * digits with the higher significance, in the code.

To display the transmitted measured values, each measured value is split into two numbers with the digits m and η in each case; the m-digit number is used to determine the light chamber, while the n-digit number, which contains the code elements with the lower digit values, is used to move the protective shield the result is a very precise representation of the transferred measured value on the scale. When transmitting and displaying angular values, the light chambers consist of sectors and the movement of the slit diaphragm represents a rotary movement.

609 578/233

The invention is explained in more detail below using an exemplary embodiment, with measured values Bearing angle values are available.

The figure contains a schematic representation of the receiving side. The transmitted measured values are stored in a known memory 1 and are available for parallel output. The outputs of the memory cells assigned to the m places of the measured values are connected to a known selection circuit 2, while the outputs of the memory cells assigned to the places are connected to a known digital-to-analog converter 3. The selection circuit 2 is an allocator which converts the m-digit number into an (/ n) code in a known manner, so that one of the outputs O ₁ ... A _{2m of} the selection circuit 2 is occupied for each of the 2 ^{m possible values} . Any arbitrary and suitable allocator can be used as the allocator, so that it is not necessary to show it in detail. In the digital-to-analog converter 3, the n-digit number of the 2 " possible numbers that are part of the measured value" is converted into an analog control voltage.

The display device consists of a flat drum ^ which is divided by opaque radial partitions 5 into 2 ^m equally sized sectors, namely light chambers 6. Each chamber can be illuminated by its own light source 7. A multiple diaphragm 8 with 2 ^m radial slots 9 is arranged in front of the drum 4. The slit diaphragm can be adjusted by an electromechanical drive

0 < z <

360 °
2 m

can be rotated steplessly. Finally, in front of the multiple diaphragm, there is a circular transparent scale (not shown) arranged.

To display the transmitted measured value, controlled by the m codes, a selection is made from the 2 ^m sectors and the associated light source is switched on via the relevant output of the selection circuit 2. The control voltage resulting from the digital-analog conversion of the "-digit number is fed a servomechanism which moves or rotates the slit diaphragm 8 against the restoring force 12 at the point of application 13.

The servomechanism shown schematically works in such a way that a position encoder 14 (e.g. potentiometer) a voltage proportional to the angle of rotation of the slit diaphragm 8 and the control voltage is counteracted. The differential voltage acts on a control amplifier 10 Pull magnet 11, which moves the position encoder and slit diaphragm at the same time until equilibrium prevails (Zero adjustment; position encoder - output voltage = control voltage). The linearity of the rotary motion is guaranteed by the position encoder.

Since the chamber partitions cannot be made infinitely small, the lighting occurs of the individual sectors in dark areas. To now have an illumination over the entire To get the diaphragm rotation range, it is advisable to place the chamber drum at the ends of the rotation range by the slit diaphragm synchronously with a small amount. This can be done by simple Means to be solved, e.g. B. by a driver that is attached to a corresponding stop of the Chamber drum strikes.

In the case of bearing value transmission, the representation of an additional variable is differently represented by a Change in length of the used for angle display

ίο Line-shaped radial luminous mark desired. To the The sectors of the chamber drum used for the rough display can still solve this problem be divided radially, as indicated by dash-dotted circles 15, so that concentric circular ring-shaped Chambers are created, each with its own light source. To represent a radial Luminescent lights of variable length are optionally one or more of the one angular range assigned light sources switched on. A light mark length change in four to eight steps is this is usually sufficient and requires two or three additional code elements for transmission serve to control the relevant light chamber. The selection circuit 2 then contains accordingly more output lines, one of which is again operatively connected to a light source is.

Claims (3)

Patent claims: 1. Display device for the analog display of measured values digitally transmitted in an (m + n) -digit binary code, in particular angle values (m = 1, 2, 3 ...; n-1, 2, 3 ..., each starting with the lowest value point), marked 'is characterized by light chambers (6) of the same size and adjoining each other, which are arranged 2 ^m along the extension of the scale and assigned to one of the 2 ^m measured values, and whose x-th chamber is controlled by the 2 ^ th (rri ^ x ^ jS) value and is made to light up, a multiple diaphragm (8) that covers all light chambers and is continuously movable in the direction of the scale, each with a slot (9) per light chamber, the width of which is significantly smaller than the chamber width Qc) , as well as means for converting the 2 "values into a control voltage which is used to shift the multiple diaphragm by the distance ζ (O ^ Lz ^ Lk) corresponding to the value 2 ^y (0 <^ y ^ ri) by means of a servo mechanism. 2. Display device according to claim 1 with a light chamber drum, characterized by Means for moving the chamber drum (4) at the end of the rotary range of the multiple diaphragm (8) by a small amount in synchronism with the movement of the multiple diaphragm. 3. Display device according to claim 1, characterized in that the angle display devices Light chambers, (6) can also be divided into concentric chambers, which correspond to the angular range assigned light sources for changing the length of the light marks can be controlled independently are. 1 sheet of drawings 609 578/233 5.66 © Bundesdruckerei Berlin