KR830000431B1 - Track potential device for video disc player - Google Patents

Abstract

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Description

Track potential device for video disc player

1 is a representative block diagram of a video disc player equipped with a track skipper of the present invention.

FIG. 2 shows a pickup cartridge suitable for use with the video disc player of FIG.

3 is an enlarged view of a part of the pickup cartridge of FIG.

4 is a view of a carriage forming a compartment for accommodating the pick-up cartridge of FIGS. 2 and 3;

FIG. 5 is an enlarged view of part of the FIG. 4 carriage. FIG.

6 is a schematic diagram showing another embodiment of the track potential device of the present invention suitable for use with the video disc player of FIG.

7 and 8 show another embodiment of the track potential device of the present invention suitable for use with the video disc player of FIG.

9 illustrates another embodiment of the invention suitable for use with the video disc player of FIG.

The present invention relates to a device used for recording and reproducing a video disc record, and more particularly to a new device for selectively repositioning a player needle from one line to another line of a spiral track whose signal is encoded on the record surface.

John K. US Patent No. 3,842,194, issued October 15, 1974 to Clemens, describes a variable capacity video disc recording and reproducing apparatus. In this device, the information track is constructed by forming a geometric shape at the bottom of the disk spiral, and the surface is made of a conductive material coated with a thin film of insulating material. The change in capacitance appearing between the conductive material of the disk and the conductive electrode of the track needle is caused by the disk being rotated by the support turn table. This capacity change is detected to reproduce the recorded information.

For example, in the application of a Clemens type video disk device, it is desirable to quickly repeat (feed and reverse) the displayed image, i.e., repeatedly output the basic identical display image output signal on a television monitor connected to the application. Means to supply. Such image repetition allows the viewer to observe a particular image for a long time. The most preferable form for mounting a video disc player is to perform a quick repetition (feed and back) operation of the display image. The fast feeding operation is particularly useful for quickly scanning information recorded on a video disc. Backfeeding is particularly useful for learning aids, which are operated for data recovery to review continuously recorded learning images on disk.

Moreover, in recording and reproducing a disc record of this type, frequently a coupling on the disc groove causes the player needle to be displaced across the grooves rather than moving along the continuous line of the base groove which normally proceeds toward one end of the disc. For example, it is convenient (bent) as the needle repeatedly crosses one or more convolutions as it reaches the engagement. In some cases, the outer bias results in continuous impact with the defective portion of the needle. This state is referred to as a "closed groove" state in which an adverse effect on the image display (sound reproduction) is caused to reproduce the same record information repeatedly.

To provide these specific operating features (eg, stop, feed, rewind) and to provide an optional device for repositioning the pickup needle from one line of the record spiral track to another to correct closed groove conditions. It is desirable to.

H. June 15, 1976 yen. U.S. Patent No. 3963961 to Crox and U.S. Patent No. 3993863 to Mr. Lidham, et al. On November 23, 1976, describe a home skip device. For these two home skip devices, the selectively actuated piezoelectric bimorph elements cause lateral displacement of the needle supporting end of the needle arm.

A preferred device for selectively displacing the needle from one line to another will be described later.

According to the present invention, the apparatus of the present invention consists of a recording and playback needle fixed near the free end of the needle arm. The rubber dog coupler secures the other axis end of the needle arm in the carriage which translates in accordance with the movement of the needle toward the record center within the recording and reproduction money. Magnetic elements are arranged near the free end of the needle arm. Electromagnets are mounted in a carriage near the magnetic element. Operation of the electromagnet causes the radial position of the needle to change in the proper direction.

A preferred feature of the invention is that the actual force exerted by the needle arm is independent of the position of the needle. For example, in the case where a plurality of closed grooves are formed on the record, the needle arm is repeatedly advanced toward the record center by the dislocation device of the present invention. The movement of the needle arm toward the record center reduces the space between the magnet and the magnet with the needle arm mounted and creates a mechanical bias that pushes the needle arm away from the record center due to the rubber coupler behind it. This mechanical bias is automatically compensated for in the device of the present invention because the force of the needle arm is automatically increased due to the reduced space between the magnetic element and the electromagnet.

According to another embodiment, the electromagnet is optionally mounted on both sides of the magnetic element with the needle mounted to operate in the conveying direction as well as in the feeding direction of the needle (ie, toward the record center). Alternately, the combination of a permanent magnet equipped with a needle arm and a single electromagnet may be modified in the above arrangement to allow the needle feeding and backfeeding operation.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 shows a video disc recording and reproducing apparatus constituted by a circuit used to operate the track potential device of the present invention. The circuit shown in FIG. 1 is described in the patents of Kruqs 3963861 and Riddom et al. The video disc player 10 is composed of a turntable 12 for rotatably supporting a video disc 14 having a spiral information track formed on its surface. The carriage 216 having a compartment formed therein for removably receiving the pickup carriage 18 is translated in accordance with the operation of the recording and reproducing needle toward the record center during the recording and reproducing apparatus. Pallet actuators are described in US Pat. No. 3,870,835 (Steb).

The capacitance change signal between generating the record and the electrode coupled to the recording / playback needle is applied to the signal generating circuit 20 which decodes the information and generates the composite video signal. The signals generated by the signal generation circuit 20 are applied to the signal processing circuit 22 and synchronous stripping. The signal processing circuit 22 rearranges the luminance and chromatic components of the video signal into a format (such as NTSC) suitable for decoding by the television receiver 26. The synchronous signals supplied by the synchronous stripping circuit 24 are applied to the synchronous counting circuit 28, and the mover counting circuit 28 selects the head of the applied vertical synchronous signal in response to the signals from the control device 20. The output signal is repeatedly generated at the divided frequency. The drive pulse generation circuit 32 receives signals from the synchronous mounting 28 circuit and the control circuit 30 and supplies appropriate control pulses in response thereto. These control pulses are applied to the potential device, causing the recording and playback needles to be selectively shifted in the forwarding and reverse feeding depending on the manner in which they are applied.

The record reproducing needle is repeatedly repositioned by the track potential device in the adjacent outer line of the helical track on the record each time the record is rotated for repeat operation. The operation pulse generating circuit 32 responsive to the control circuit 30 and the synchronous mounting circuit 28 supplies an appropriate pulse at one rotational speed of the turntable so that the needle reverses every revolution.

The rapid feeding operation is performed by causing the pick-up needle to be shifted forward every 1/2 turn of the record. Likewise, the reverse feed operation is performed by causing the needle to be transferred every 1/2 line of the record.

For the purpose of removing the closed groove, a detection circuit of the type described in US Pat. No. 3,963,860 (Brus) can be used to detect the presence of a closed groove. The needle is moved in the feeding direction by the operation of the track potential device in accordance with the generation of the closing groove detection pulse. The track potential device according to the present invention will be described in detail with reference to FIGS. 2 to 5 as follows. 2 shows a pickup cartridge 18. This cartridge includes a needle arm 50 supported at the free end of the needle holder 52. The pickup needle 52 is fixed to the needle holder 52. Extensions 56 on needle holder 52 are arranged between a pair of non-magnetic plastic bumpers (not shown) mounted on carriage 16. The bumper acts to limit the needle 54 from escaping to both sides thereof.

The other end of the needle arm 50 is fixed to the connecting plate 62 through the coupler 64. The flexible diaphragm 66 allows the connector plate 62 to be secured to the cartridge body 68. U-shaped spring 70 supports the needle assembly within the operating range of cartridge 18 during recording and processing thereof. The conductive plate spring 72 is connected to an electrode coupled in a needle (not shown) with respect to a terminal (not shown) mounted on the cartridge 18.

The cartridge 18 is mounted detachably in the steering wheel 16 (FIG. 4). As already described, the carriage moves toward the record center in accordance with the radial action of the needle during recording and playback, as described in US Pat. No. 3,870,835 (Steb).

The carriage 16 is provided with a device for lifting and lowering the needle arm 82 and an arm extension device 84. The needle arm lifting and lowering device was released on October 11, 1977. Seed. US Patent No. 4,053,161 to Breejay et al. The elevating and lowering device lowers the pick-up needle 54 on the video disc during recording and reproduction. The device 82 acts to lift the needle out of the record so that the carriage does not move from the rest position outside the record to the operating position on the record or the player touches the bead around the record on the needle that is in the pause mode. do.

As shown in FIG. 4, the darkening apparatus 84 is comprised from the support body 86. As shown in FIG. When the cartridge 18 is driven in the compartment 80 and the cover 90 of the carriage 88 is closed, the device 86 moves in accordance with the lid extension of the support extension 62 and the cartridge as the cover moves. The connection between the connecting plate 62 is made. The device 92 operates to couple between the multi-terminal 92 and the cartridge terminal on the carriage 16 to electrically connect the needle electrode to the rest of the player circuit. The support 86 of the arm extension device 84 allows translational movement with respect to the needle arm such that there is no periodic deviation in the relative speeds of the needle and the record during recording and reproduction. These periodic deviations in the relative speeds of the needles and records can cause many bad things, such as eccentric distortions. U. S. Patent No. 3,983, 318 (Miller) describes a dark organ device.

The bottom wall of the carriage is provided with an opening 94 so that the recording and playback needle protrudes through it during the recording and playback so that the needle and the record come into contact when the needle arm is lowered by its lifting and lowering device 82.

A lever (not shown) on the cover 88 allows the needle arm to be mounted on the arm 96 of the elevating and lowering device 82 when the cover is closed after installing the cartridge 18 in the carriage compartment. Fold the U-shaped needle arm support spring.

The magnetic element 100 (second and third degrees) is fixed adjacent to the free end of the needle arm 50. The electromagnet 102 is mounted in the carriage so that its polar surfaces 104 and 106 are arranged adjacent to the magnetic element on which the needle arm is mounted. The electromagnetic winding 108 (FIG. 5) is connected to the actuation pulse generating circuit 32 of FIG. The actuation of the electromagnetic causes the polarity to pull towards the magnetic element equipped with the needle arm which causes the needle to be displaced radially inward (ie forward motion). To allow the needle feeding and backfeeding operation, the electromagnetic can be installed on both sides of the magnetic element in the following described manner.

In the embodiment shown in FIG. 6, the needle arm 200 supporting the needle 202 at one end thereof is formed at the other end fixed to the pickup cartridge 04 by the rubber coupler 206. The pick-up cartridge is mounted in a haul bar 208 that is movably mounted. The magnetic element 210 is fixed to the needle arm 200 at regular intervals from the needle. The electromagnet 212 is fixed to a carriage near the magnetic element. The electromagnet 212 is composed of a horseshoe core 214 having magnetic pole surfaces 216 and 218 and a winding 220 wound around a central portion of the core. As an example, an operation signal indicating the reverse potential due to the closing groove is applied to the winding so that the needle moves in the feeding direction so as not to perform an undesirable repetitive operation. The number of circuits allowed to be displaced each time the electromagnet is pulsed is a function of the magnitude of the operating pulse and the distance between the magnetic element 210 and the electromagnet 212.

Another embodiment of the invention is shown in FIGS. 7 and 8. As shown here, the electromagnets 300 and 302 are mounted in the carriage 304 on both sides of the magnetic element 306 mounted on the needle arm 308. The feeding and backfeeding operation of the needle may be made by separately exciting the inner and outer electromagnets 300 and 302. Alternately, the coupling of the permanent magnet 400 and the single electromagnet 402 equipped with the needle arm may be configured in the arrangement shown in FIG. 9 to perform the feeding and backfeeding operation of the needle. The direction of operation of the needle is controlled by the direction of current flowing through the winding 404 around the electromagnetic core 406.

In a video disc apparatus using a grooved information track, application of a control signal to an electromagnet and a final magnetic force applied to a permanent magnet on the needle arm cause the needle to move in a predetermined radial direction. Therefore, it can be seen that when the needle arm moves radially, the needle tip moves above the groove wall in one line, below the groove wall of the adjacent line, or moves down the groove wall of several lines away from the initial line when a large signal is applied. The permanent magnet is located on the needle arm or in an adjacent position of the plane where it is arranged during recording and reproduction, so that a magnetic force is applied, thereby causing the needle tip to move laterally in the radial direction.

Claims (1)

When the relative speed of the needle and record is set, the previously recorded information is reproduced from the disc record having the spiral information track by the needle on the track, and the previously recorded information formed along a continuous line toward the needle tip. Wherein the needle arm is configured to support the needle moving the track at one end thereof in the longitudinal direction, and the device is configured to support the end of the needle arm away from one end and radially of the needle moving the track. A track potential device comprising a device for selectively rotating a needle arm around the longitudinal axis to displace in position, wherein the permanent magnetic element 306 is secured to the needle arm and smoked and excited on the needle arm relative to the record during playback. Electromagnets 300 and 302 to form a controllable magnetic field of a predetermined polarity when The carriage 304 is configured to secure the support to the support adjacent to the permanent magnetic element, and the radioactive position of the needle moving the track is biased in the radial direction according to the polarity of the controllable magnetic field 220, 404. A track potential device for a video disc player, comprising a device for selectively excitation.

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