CN86205716U

CN86205716U - Electric gramophone with emission-type linear tracing tone arm

Info

Publication number: CN86205716U
Application number: CN 86205716
Authority: CN
Inventors: 焦保民
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-08-07
Filing date: 1986-08-07
Publication date: 1987-06-24

Abstract

The utility model belongs to the field of electric gramophone apparatuses. The utility model is characterized in that a straight line tracking type tone arm is fixed on the upper part of a gramophone turntable. A magnetic floating sound producer is arranged in one end of the tone arm. The sound producer can smoothly make a radial linear motion for a disc in the tone arm. The tracking error of the tone arm is eliminated. The electric gramophone with emission type linear tracing tone arm has an obvious effect on prolonging the service life of discs and reproducing needles and improving the sound reproduction quality of the discs. An amplitude modulation radio frequency circuit of which the frequency is adjustable is arranged in the other end of the tone arm. The electrical signal of the sound producer not only can make a line output, but also can be directly emitted as an amplitude modulation high-frequency signal and then be received by surrounding radios.

Description

Electric gramophone with emission-type linear tracing tone arm

The utility model belongs to electricity and sings the equipment field.

The tone arm that popular electric phonograph uses is the long-armed shape sound arm of single fulcrum mostly, it is a circular arc that this sound arm makes the motion track of stylus, the radial alignment of machinery cutter head moves different during with gramophone recording, therefore, when disc reduction sound reproduction, just produced tracking error, increase the wearing and tearing of disc and stylus, increased harmonic distortion and noise.The synchronization-moving linear servo formula of a kind of fulcrum and stylus tone arm has appearred now, the same radial alignment at disc with the disc cutter head of this tone arm moves, eliminated tracking error, but because this sound arm has adopted straight-line motor and complicated servo circuit, price is increased, be not suitable for and popularize the type use.Popular electric phonograph generally all is a circuit output pickup signal, through electron tube or transistor and the playback of enlarger ability.The electric phonograph that carries playback has increased by a cover playback system, has strengthened cost of products.Popular wireless owning amount is very big in the rural area at present, much is not with the pickup socket, is not easy to the use that connects of electric phonograph.

Based on above-mentioned situation, the purpose of this utility model is made a kind of machine of popularizing that is suitable for and is used, and has the arm-type electric phonograph of linear tracing sound of amplitude modulated radio frequency signal.

The utility model is made up of the sound arm of frame on disc, pickup that the electromagnetic levitation type straight line moves and the amplitude modulation radio circuit in the sound arm.As accompanying drawing, a sound arm 4. in the ground straddle mounting of turntable upper fixed, in the sound arm end 4. an elongated slot is arranged, the bottom of elongated slot has the magnet of two block length bar shapeds 5. a plastics capsule to be housed 6. in the groove, box stretched up and down one install pickup 7. with balance bob fulcrum 8., 9. 5. 6. inner the and sound arm of capsule 4. elongated slot internal magnet be equipped with two blocks of short magnet accordingly, two pairs of magnet opposite sex are repelled each other up and down, make the plastics capsule 6., pickup 7., 8. balance bob suspend, by reduce capsule 6. with the surface of contact of sound brachium groove, reduce 6. moving resistance of capsule.By the adjustment hammer 8., the pin that disc applies about the 1-6 gram is pressed, make pickup, in sound brachium groove, move smoothly, reach the purpose of linear tracing 7. along with the screw thread of disc sound track.Regulate the levelness of sound brachium groove, make it oblique just outside disc, can make pickup produce outwards sliding power, reach dynamically balanced purpose.

In the sound arm other end 4., the amplitude modulation radio circuit is housed, the signal that 7. pickup is sent here amplifies to be modulated in the miniwatt medium-wave band high-frequency signal to be launched, make the signal that to receive electric phonograph apart from the MW receiver of about 3 meters of phonographs, have the circuit output socket of pickup signal in addition, external power supply plug is suitable for the receipts sound amplifier that phonograph input socket is arranged.

The utility model is eliminated tracking error owing to used the sound arm of electromagnetic levitation type linear tracing, to prolonging disc stylus serviceable life, improves playing quality, and reducing linear tracing formula sound arm cost has remarkable result.The signal of emission-type sends popular radio user to and has brought convenience.

Fig. 1 is a kind of employing the utility model electric phonograph outside drawing.

Fig. 2 is an electromagnetic levitation type pickup structural representation in the utility model.

1. transparent phonograph lid among the figure; 2. be turntable; 3. be the phonograph lower casing; 4. be linear tracing sound arm; 5. be rectangular magnet; 6. be the plastics capsule; 7. be pickup; 8. be balance bob; 9. be the short magnet that suspends; 10. be the transmission frequency adjusting knob; (11) be power switch; (12) be pickup signal output socket.(13) be external power supply socket.

Claims

1, a kind of electric phonograph with linear tracing formula sound arm is characterized in that an end of linear tracing formula sound arm is equipped with the electromagnetic levitation type pickup.

2, the electric phonograph of linear tracing formula sound arm according to claim 1, it is characterized in that the electromagnetic levitation type pickup be with one in adorn the fulcrum of stretching down in the plastics capsule of two blocks of short magnet and be connected.

3, the electric phonograph of linear tracing formula sound arm according to claim 2 is characterized in that the plastics capsule is contained in the elongated slot of linear tracing formula sound arm one end, and two blocks of strip magnet that repel each other with the interior short magnet opposite sex of plastics capsule are being adorned in the bottom of elongated slot.