DE1082749B - Pickup with a transducer and a needle carrier held at one end on the housing - Google Patents

Description

GERMAN

The invention relates to a pickup with a transducer and one with its one end on the housing mounted needle carrier, which rests on the end of an intermediate piece connected to the transducer.

In all known devices, the lever ratio of the scanning and transmission elements and thus the restoring force cannot be changed either. In many cases, however, there is a desire, be it for manufacturing inaccuracies to compensate, be it to the optimal scanning conditions for each of several scanning needles to create to correct the restoring force.

For example, pickups of the type mentioned above are known in which a rod-shaped needle carrier is supported rotatably about its longitudinal axis in the intermediate piece. This needle carrier points to his free end of two needles, which are brought into the working position by rotating the needle carrier by 180 ° can be.

Furthermore, pickups are known in which a leaf spring-shaped needle carrier has two bearing points is held on the pickup, with the housing-fixed bearing point between the styli and the rear bearing point acting on the converter is arranged. By suitable choice of dimensions of the needle carrier and its bearing points, the restoring force related to the scanning needle can indeed can be changed, but for a given needle carrier it is fixed and can no longer be changed.

Furthermore, mechanical sound boxes are known, the needle carrier about half the length by one horizontal axis are tiltable on the housing. The rear end of this needle carrier is about a Rod connected to the membrane of the sound box, while the front free end with a scanning and cutting pen is equipped. The housing-fixed bearing of the needle carrier can be adjusted so that either the cutting pen or the follower pen can be moved into the working position.

According to the invention this is made possible in that the needle carrier is displaceable in its longitudinal direction is arranged on the housing and on the intermediate piece of the pickup.

If you move the needle carrier in the specified direction, the lever ratio changes the scanning and transmission elements and thus also the restoring force.

As the restoring force can be regulated, the elasticity of the needle carrier in vertical direction changed, such that with a small restoring force the elasticity of the part of the Needle carrier from the stylus to the mentioned articulation point is relatively large. This size However, elasticity is particularly effective with small rear pickups with a transducer

and one with its one end

needle carrier held on the housing

Applicant:

ELECTROACUSTIC

Company with limited liability,

Kiel, Westring 425-429

Hans-Robert Kühn, Kiel-Gaarden,

and Rudolf Drews, Kiel,
have been named as inventors

Counteracting forces occurring jumping out of the needle carrier from the tone groove.

In addition to this advantage, there is also the fact that, by changing the restoring force, the voltage to be generated in the converter can be regulated, thereby advantageously reducing the volume of a Playback device can be readjusted. Often this also makes the arrangement of a superfluous additional amplifier part.

Furthermore, the adjustability of the restoring force provides the advantageous possibility for different types of and tone grooves to be played at different speeds are one and the same stylus to use. With a corresponding design of the scanning needle, it can be that of the respectively to be scanned Tone groove associated restoring force by moving the needle carrier relative to the intermediate piece can be set.

In an advantageous development of the invention, the needle carrier is arranged on a slide, which is held displaceably in the housing of the pickup in such a way that the distance between the stylus of the needle carrier can be changed from the end of the intermediate piece. Through the holder of the needle carrier in a slidably arranged slide, which is also arranged to be easily exchangeable, leaves the needle carrier can be easily adjusted by hand.

009 528/145

However, additional switching means can also be provided, for example with the multi-speed transmission of the disk player or the disk size sensing device so coupled are that the setting of the restoring force depends on the gear setting or the plate size he follows. It is also possible to adjust the needle carrier by adjusting the weight to make dependent.

The invention will now be explained in more detail below with reference to the drawing.

In Fig. 1, a pickup is shown in perspective, in which the needle carrier 1 compared to a Intermediate piece 2 is arranged displaceably. The needle carrier 1 is held in a slide 3. This The carriage has a dovetail-shaped slide shoe in a corresponding manner shaped rail 5 is guided. The rail 5 is incorporated into the housing 6 of the pickup and runs parallel to the longitudinal direction of the needle carrier 1. The intermediate piece 2 is arranged at the head end, which is connected to a not shown wanderer. The upper end 7. of the intermediate piece 2 is fork-shaped. The needle carrier lies in this fork. He is trained so that he with the inner fork flanks is frictionally in contact, so that any lateral deflection of the Head end of the needle carrier attached scanning needle 16 is transmitted via the fork to the transducer. The distance between the scanning needle 16 and the fork 7 determines the size of the restoring force. By moving of the carriage 3 and thus of the needle carrier within the fork 7, this distance can be varied, whereby the restoring force changes inversely proportional to this distance. Directly proportional however, the elasticity of the scanning element changes perpendicular to the plane of the turntable.

For the purpose of replacement, the carriage 3 can be pushed into the rail from the rear of the system whereby the needle carrier 1 with the fork 7 of the intermediate piece 2 engaged.

In FIG. 2, the guide rail 8 of the carriage 3 is arranged in a raised manner on the ceiling of the pickup 6. The needle carrier 1 is provided on both sides with beveled tabs 9, which over a right angle grip formed end 10 of the intermediate piece 2.

Fig. 3 shows a particularly favorable guidance of the carriage 3. It consists of two slide rods 11 which are fastened between two brackets 12 raised on the tonearm cover. This kind of Leadership is advantageous because it is used for the articulation of switching means, for example for simultaneous Switching with the multi-speed gearbox is suitable.

In Fig. 4 is on the pickup housing on a raised holding element 13 in the horizontal Direction a pipe 14 attached. The tubular end 15 of the needle carrier is in the tube plugged. It can be moved in relation to the pipe.

In FIG. 5, the guidance of the needle carrier 1 in the tube fixed to the housing according to FIG. 4 is shown enlarged. This tube fixed to the housing can preferably be slit in its longitudinal direction, so that the tubular end 15 of the needle carrier can be fixed by means of a clamping device.

The aforementioned slide, in which the needle carrier 1 is mounted, can also by means of an in the tonearm cover made slot or an elongated hole in the longitudinal direction of the pickup system be slidably guided.

Claims (15)

Patent claims: 1. Pickup with a transducer and one held at one end on the housing Needle carrier, which rests on the end of an intermediate piece connected to the transducer, thereby characterized in that the needle carrier (1) is displaceable in its longitudinal direction on the housing and on Intermediate piece (2) of the pickup is arranged. 2. Pickup according to claim 1, characterized in that the needle carrier (1) on one Slide (3) is arranged, which is held in such a displaceable manner in the housing of the pickup is that the distance between the scanning needle (16) of the needle carrier and the end of the intermediate piece (2) is changeable. 3. Pickup according to claim 2, characterized in that the rail for guiding the Slide is incorporated as a groove in the housing of the pickup. 4. Pickup according to claim 2, characterized in that the rail for guiding the Carriage is arranged raised on the housing of the pickup. 5. Pickup according to claim 2, characterized in that the carriage on which the Needle carrier is attached, is slidably arranged on two slide rods. 6. Pickup according to claim 1, characterized in that that the carriage or the needle carrier itself is held displaceably by hand. 7. Pickup according to claim 1, characterized in that the rear end of the needle carrier is tubular. 8. Pickup according to claim 7, characterized in that the tubular end (15) of the The needle carrier (1) can be displaced in a tube (14) attached to the housing (6) of the pickup is led. 9. Pickup according to claim 7, characterized in that the tubular end (15) of the Needle carrier slidably pushed onto a pin attached to the housing (6) of the pickup is. 10. Pickup according to claim 1, characterized in that the carriage by switching means is movable. 11. Pickup according to claim 10, characterized in that the switching means with the Switching device of the variable speed drive of the record player are coupled. 12. Pickup according to claim 10, characterized in that the switching means for displacement of the carriage are coupled to the device for filling the plate size. 13. Pickup according to claim 10, characterized in that the switching means for displacement of the carriage is coupled to the device for adjusting the tracking force of the tonearm are. 14. Pickup according to one or more of claims 1 to 13, characterized in that that the needle carrier (1), which is primarily designed as a leaf spring, is attached to a slide (3) is, on which a dovetail-shaped sliding shoe (4) is provided, which in one running in the longitudinal direction of the needle carrier fenden rail (5) is guided that the needle carrier in a fork-shaped end (7) with one the transducer connected intermediate piece (2) engages and that the distance between the stylus and the intermediate piece (2) can be changed by moving the carriage (3). 15. Pickup according to claim 14, characterized in that the needle carrier through Pulling out the slide (3) is replaceable. off the rails (5) Documents considered: German Patent No. 231978; German patent application E 5275 IX a / 42 g published on November 4, 1954);
U.S. Patent No. 2,742,530. 1 sheet of drawings ® 009 52 «/ 145 5.60