US1780419A

US1780419A - Magnetic reproducer

Info

Publication number: US1780419A
Application number: US197537A
Authority: US
Inventors: Paul E Fischler
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-06-09
Filing date: 1927-06-09
Publication date: 1930-11-04
Anticipated expiration: 1947-11-04

Description

Nov. 4, 1930.

F. E. FISCHLER MAGNETI C REPRODUGER Filed June 9. 1927 4 IN VEN TOR.

A TTORNE Y.

Patented Nov. 4, 1930 PATENT OFFICE PAUL E. FISCHLER, F BAY CITY, MICHIGAN MAGNETIC REPRODUCER Application filed. June 9, 1927.

This invention relates to a magnetic sound reproducer, and it consists in the novel features hereinafter described and claimed.

An object of the invention is to provide a device of the character stated, adapted to be used in conjunctionwith phonographs or the like and which will transmit a more sensitive wave vibration than those heretofore used. WVhile the device may be used in conjunction with phonographs, it may also be used in conjunction with piano and organ music for broadcasting purposes.

A further object of the invention is to provide, in conjunction with a suitable vibrating member, means which may be used as a cone speaker for radio broadcast reproduction.

With these and other objects in view, the

structure of the instrument includes a plate 29 upon which a permanent magnet is mounted. The magnetic cores are carried at the poles of the magnet and an armature consisting of a steel reed is disposed between the cores and is held by a needle holder, which in turn is adjustably supported upon the said plate. A needle of usual pattern is carried by the needle holder.

In the accompanying drawing:

Figure 1 is a front elevation of the instru ment, showing one form of the arrangement of the parts thereof.

Figure 2 is a sectional view thereof, cut on the line 22 of Figure 1.

Figure 3 is a front elevation of a modified form of the instrument. v

Figure 4c is a sectional view thereof, cut on the line 4.4 of Figure 3.

As illustratedin the accompanying drawing, the magnetic sound reproducer consists of a base plate 1, upon which is mounted a permanent magnet 2. In the form of the arrangement as shown in Figures 1 and 2, core members 3 areadjustably connected with the poles of the magnet 2, the coils at are mounted upon the said cores. Adjusting screws 5 are supported upon the plate 1 and a needle holder 6 is carried between the inner ends of the said screws. ried by the needle holder 6 and the intermediate portion thereof is disposed between the A steel reed 7 is car- Serial No. 197,537.

cores 3. A needle 9 is carried by the needle holder 6 in the usual manner. The opposite end of the reed 7 is disposed between spaced contact plates 8 which are adj ustably mounted on the base 1 by means of the bolts 8, these bolts being anchored in the base and threaded to receive spaced nuts 8 between which the plates 8 are mounted. Rubber cushions 10-are interposed between the plates and the armature, and it will be obvious that the armature may be adjusted to center with relation to the magnet by means of the nuts 8", and to compensate for natural dissipation or deterioration of the energy in the magnet.

A vertical adjustment of the armature in relation to the cores is provided by said plates. The resilient rubber damping pads 10 are carried by the plates 8 and firmly clamp the end of the armature, limiting its movement I to a certain frequency range, thereby damping out resonance in the armature assembly and controlling the tone quality of reproduction.

In the form of the arrangement of the features of the instrument, as shown in Figures 3 and 4, the same consists in fixing the core members 3 to the poles of the magnet 2. The coils 4 are mounted upon the cores 3 in the same manner as shown in Figures 1 and 2. The needle holder 6 is supported bythe screws 5 mounted upon the plate 1 and it carries the needle 9 as hereinbefore described. The free end of the reed 7 is provided along its opposite edges with outstanding shoulders 7 which are disposed towards the coils 4 and which normally lie above the inner ends of the cores 3.

The device incorporates the novel features of construction, and the principles above mentioned, and further affords an efiicient means for transferring to a pulsating or fluctuating A. C. current, the vibrations from a phonograph record. The fluctuating A. C. current may be amplified to great volume by any one of the known eflicient means, resulting in re production of phonograph music in a great degree of faithfulness and freedom from mechanical noises. The device further affords an inexpensive means of securing the foregoing results with a freeness from delicate adjustment, and with very little possibility of becoming inoperative from mechanical faults.

From the foregoing description of the construction of my improved appparatus, it will be seen that I have provided a simple, inexpensive and eflicient means for carrying out the objects of my invention, and while I have particularly described the elements best adapted to perform the functions set forth, it is obvious that various changes in form, proportion and in the minor details of construction may be resorted to without depart ing from the spirit or sacrificing any of the principles of the invention.

Having described the invention, What is claimed is:

1. An electric pick-up device comprising a plate, a permanent magnet mounted thereon, cores mounted upon the poles of the magnet, coils mounted upon the cores, a reed armature disposed between the coils and transversely of the cores, means for fixedly supporting the reed, said means being adapted to hold a needle.

2. An electric pick-up device comprising a plate, a permanent magnet mounted thereon, cores adjustably connected with the poles of the magnet, coils mounted upon the cores, a needle holder mounted upon the plate, a reed armature fixedly carried by the needle holder, said reed being disposed between the coils and transversely of the cores, said needle holder adapted to support a needle.

3. An electric pickup device comprising a base, a permanent magnet mounted thereon, means carried by the base plate for adjustably supporting a needle holder, a needle holder carried by said means, a resilient armature the outer end of which is carried by the needle holder and disposed between the coils and transversely of the cores and means for adjusting the inner end of the armature.

4. An electric pick-up device comprising a plate, a magnet mounted thereon, coils carried at the poles of the magnet, a needle holder mounted upon the plate, a'resilient armature arranged in the magnetic field attached at its outer end to the needle holder, and means for adjustably confiningthe opposite end of the armature, the intermediate portion of the armature being disposed between the coils.

5. An electric pick-up device comprising a plate, a permanent magnet thereon, cores of magnetic material on the poles of the magnet and extending toward each other, coils on said cores, an armature arranged in the mag netic field and extending across the opposing ends of said cores and means for fixedly holding and also for adjusting the ends of the armature, the outer end thereof in the direc tion of the axes of said pole extension cores and the inner end thereof in a direction substantially at right angles to said axes.