DE564601C - Scale arrangement for radio receiver - Google Patents

Description

Scale arrangement for radio receivers The usual mounts up to now the voting dials of radio receivers were such that the dial directly through one Cutout in the front panel of the receiver housing could be read. Such arrangements require constructive difficulties due to the fact that they are proportionate small angular rotations of the tuning capacitors on an enlarged scale on the Are to be displayed on the scale.

According to the invention, the scale can be of any size Axis of the tuning capacitors are mounted, and the visualization takes place by optical projection onto a screen using magnifying optical Systems.

The use of means for the optical projection of a scale onto a reading screen is already known in radio receivers, but the previous arrangements provided a transparent scale drum directly in front of a reading window, from which a shadow image was thrown onto the observation window. Such an arrangement does not allow independent construction of the scale with respect to the housing sand, rather the scale drum must move immediately in front of the reading screen. In contrast, in arrangements according to the invention, the scale arranged anywhere in the receiver housing be. Several embodiments of the invention are shown on the drawing in i6 applications shown. Fig. I shows a device in front view, Fig. A in plan view with removed Lid, Fig. 3 in cross section: Figs. 4 and 3 show a second embodiment Approximation form of the invention in plan view and Cross-section: Fig. 6 shows a projection screen; Figs. 7, 8 and 9 show a further configuration implementation of the invention in three project options Fig.io and ii show a further ex implementation of the invention in two project options: Figs. 12 and 13 show a further configuration implementation of the invention in two project options: Fig. I-. and 15 show a further implementation of the invention in two projects --- ions; Fig. 16 shows another embodiment form of the invention with several drum to melt. The switchboard i carries a plate 2, the is provided with an opening 3 in which a translucent screen .I is conveniently made of flexible material such as celluloid.

Inside the housing is the well-known apparatus from For the sake of simplicity, only the two capacitors coupled together 6,; are shown, the stators of which are attached to a common housing 9 and their rotors sit on a common shaft 8. This wave is (Fig. 3 j coupled to your rotary knob 12 by a worm gear io, which is on the shaft i i sitting. To display the position of the rotors sits on the shaft 8 between the two capacitors 6 and 7 a display drum 13, which has slots on its circumference i4. that should represent the tick marks on the scale. Inside the drum there is a small incandescent lamp 15, the rays 16 of which pass through the slots.

"Between the drum and your screen .I there is a lens 17, through which an enlarged image of part of the drum i8 is projected onto the screen will. On the screen .I there is an index line 5, which allows the setting of the Rotor shaft 8 relieved to a certain station.

With the construction just described you are able to use the Drum and capacitors in a suitable place as far away as you want from the screen 4. to be arranged. in particular one can see the Troininel considerably below the opening 3 arrange. This gives you freedom in terms of construction, which is fully essential for the commercial production of the receiver.

In the embodiment according to Fig..I, instead of the lens 17, a Concave mirror 17 'used. The lamp 15 within the drum must naturally accordingly be arranged somewhat differently so that its rays pass through the slots go through. The rest can be seen immediately from the representation.

With the arrangement according to fig. 7, 8, 9 - the image of the scale is shown on the screen .1. projected through a lens 17 and plane mirrors 21, 22, 23. The drum 13 is here all attached to one end of the shaft 8, which protrudes over one end of the actual capacitor housing. The arrangement of the lamp 15 and the beam path can be seen from the drawings.

The advantage of this construction, namely that of lenses and mirrors existing optical system, allows the drum to be all your one end of the rotor shaft to arrange.

In the exemplary embodiments described so far, the rotor shaft 8 was arranged parallel to the switchboard i. In the execution fora according to Fig. IO and II, however, the drum shaft 8 is arranged perpendicular to the switchboard. In this case, the two shafts 8 and ii are coupled to one another by a belt drive 30, 31 and 322. Here, the drum 13 is located outside the capacitor housing at one end of the shaft 8, parallel to the switchboard i, while the scale cable braid 14 is arranged at an angle to the axis of rotation of the drum. The rays from the lamp 15 pass through the slits above the lamp and fall on a concave mirror 33. - whereby an enlarged image of the scale division is projected onto the screen. The reflector 33 is dimensioned and so arranged in relation to the inclined scale slots that a normal image 18 is generated on your reflector 33. This arrangement gives even greater freedom in terms of the structural design.

In some cases it may be useful to use the compact arrangement to maintain the capacitors according to Fig. io and on the other hand to the arrangement to dispense with the drum close to the switchboard. Sees such a case the execution forums according to Fig. 12 and 13. Here the belt drive is according to Fig. I i retained, but the drum 13 is arranged on the rear of the housing. In addition to the lens 17, a self-supporting mirror 35 is also arranged on the rear wall 36.

In the exemplary embodiment described above, that was on the screen d. projected image arranged so that the scale tick marks were parallel to the base plate of the housing, d. H. that when turning the head the Scale lines move from top to bottom or vice versa on the screen 4.

Now you can also arrange the optical Svstein so that the scale lines when turning the button move from right to left or vice versa. This is achieved in the design according to Fig.1.I by means of an inverting prism 36, which is arranged between the lens 17 and the screen and its reflective Surface forms an angle of d.5 ° to the horizontal. Fig. 15 shows the pictures 1.L ', as they appear on the screen .I with this arrangement.

Fig. 16 shows a receiver with two switch knobs, for example a §uperhet. Here 8 and 8 'are the two capacitor axes with the scale drums 13 and 13 ', the scale slots 14 and 14' and the lamps 15 and 15 '. "Between the two drums and your screen are the two lenses 4o and d i, in such a way that the two i scales either side by side or on top of each other appear. In addition, the two light bulbs can emit light of different colors. for example 15 red and 15 'blue or green light.

You can use as many scale routines as you want. and the Separate images on your screen 4 with @iaphragines. the next to the Scales lie so that the different scales are parallel, or __muuL can Lay the images on top of one another and differentiate them by means of different colored lighting. For example, one scale can be red, the second blue or yellow, and the third green _Uleuchten. In the latter case, the buttons are expediently finitely corresponding Colors.

Claims (1)

YATETXTANSPRt; CHr: i. Scale arrangement for radio receiver, thereby characterized in that the arranged inside the housing in any size and position, Finite scale coupled to the spacer lines through an optical system in an enlarged scale Scale is projected onto a screen facing your viewer. Radio receiver according to claim i, characterized in that incandescent lamps are inside the scale barrels are arranged which shine through slits serving as graduation lines. device according to claim i and a with several scale rotins, characterized in that the light bulbs belonging to the individual drums have a different color send out.