SU815746A1 - Sound pick-up - Google Patents

Description

one

The invention relates to instrumentation, namely to the technique of playing mechanical sound recordings, and can be applied in modern electric-playing devices.

A phono cartridge is known, containing a head with a needle, as well as a tonearm mounted on the conical top of the support and a counterweight with the possibility of horizontal movement of the cargo along the LI tonearm.

A disadvantage of the known device is that with minimal friction in the support, a stable balance of the tonearm is provided only if / if the point relative to which the BATTLE and horizontal movements are located is located on the line of intersection of the center of the pickup. In addition, the specified sound pickup can work only with a certain type of head, and the height of the suspension of the arm, equal to 15 mm, is the cause of additional nonlinear distortions during sound reproduction.

The closest to that proposed by the technical essence is a phono cartridge, containing a needle-head, tonearm, hinged

2

on the support, a device for balancing the tonearm, which includes a counterweight and a photoelectric sensor for the angle of rotation of the tonearm with the photo cells 12.

The disadvantage of this device is the relatively high complexity of manufacturing and commissioning.

The purpose of the invention is to reduce the labor capacity of the device and to attack the device with high quality of reproduction, as well as to simplify the balancing and ensure the versatility of the arm for various

5 types of heads.

This goal is achieved by the fact that in a known sound pickup comprising a head with a needle, a ton arm hinged on a support,

Claims (2)

0 a toning device balancing device, including a counterweight, and a photoelectric sensor of the rotation of the tonearm with photocells; , and the support - with holes, in which photovoltaic cells are installed, and with a groove. The pickup is also equipped with a half-ring, placed in the support groove, and an earring with a divided ring resting at one point on the edge of the half-ring, on .a shackle rigidly zykrepleny optical shutter and the arm having an inflection in ver. In this case, the suspension point of the tonearm and the optical flaps are located at the level of the needle tips, and the center of the body of the tonearm is below the suspension point. FIG. 1 shows the proposed pickup, general view; in FIG. 2. The installation of the photo cells and the optical flaps of the coil rotation sensor of the tonearm and balancing device in FIG. 3 shows the position of the optical shutters relative to the photocells and the vertical axis of rotation of the tonearm. earring 3 rigidly fixed tonearm 7 and two optical flaps 8 of the photoelectric sensor of the angle of rotation of the tonearm. The lever 7 has a bend 9 in the vertical plane, and the suspension point of the tonearm and the flap 8 are located not at the level of the tip of the needle 2, the photo cells of the sensor 10 and 11 are located in the holes 12 of the support b. The pickup also contains a tonearm balancing device, which consists of a counterweight 13 with two weights 14 and two V-shaped. the pins 15 screwed in counterweight with the possibility of separate movement of each of the loads 14 along the pins 15, the counterweight 13 has the ability to move along the lever 7. The counterweight 13 with the body 14, as well as the rocker of the flaps 8 are fixed with screws 16, The device works as follows .. Needle 2 heads 1 pickup; slides along the groove of the rotating plate and turns tones 7 with earring 3 at some angle relative to the point of suspension of the ring 4 n to the edge of the half ring 5, with one optical shutter 8 opening and the second diametrically closing the photocells 10 and 11, causing the angle of rotation of the toner sensor . The coarse adjustment of the clamping force of the head 1 is carried out by moving the counterweight 13 along the ton-arm 7, for which purpose the screw 16 is pre-loosened. The stability of the tonearm is provided by shifting the center of gravity below the suspension point, for which the screws 16 are loosened, and the weights are shifted down along pins 15. Horizontal balancing of the tonearm is carried out by separate movement of the weights 14 along the pins 15. To remove the tonear, it is enough to remove the half ring 5 from the groove of the support 6. The introduction of new structural elements and their interconnection t at the lowest cost to get high quality pickup. Claims of the invention: Pickup device comprising a head with a needle, a ton arm, hinged on a support, a tonar balancing device including a counterweight, and a photoelectric sensor of the angle of rotation of the ton arm with photo cells, in order to reduce the labor intensity of manufacturing and commissioning at high quality sound reproduction; two V-shaped pins attached to the counterweight with loads that can be moved separately along the pins are inserted into the toner balancer; The photoelectric sensor is made with optical shutters, and the support has holes in which photocells are installed, and with a groove, the pickup is also equipped with a half ring placed in the support groove and an earring with a split ring resting at one point on the edge of the half-ring, and rigidly optical flaps and a tonearm are bent, having a kink in the vertical PLANE, with the suspension point of the tonearm and optical flaps located at the point of the needle, and the center of the body of the tonearm is below the suspension point. Sources of information taken into account in the examination 1. Haase G.I. Modern electric players. Issue 81.M., Energie, 1975, p. 81-82. 2. US patent 4073565, cl. 274-23A, 04/11/78 (prototype).