AU525918B2 - Track skipper for video disc player - Google Patents

Description

*1~ L4W, 17 02Oi L&"vent UAW,

Insert FULL name(s) of 3ipplicant(s)

()Insect FULL addressfes) of applicant(s)

Insert TTftE of invention

V-E961-SG8VatN1S une 1VNOIIVN i8VHI-.S31. NouiflOS3lJAdOOl3IlW

f, Oft"provisional"

0 1,

9I~~ B=Jjjjj gz. r iun an b asi plcto

I 00

"z 11O" meG a. a

o 5 saS a

a 544555 U

S

*545 S S 5*

Insert I;ATE of signing

Sisnaturc of applicant(s) (For body 'O;Prorte see edote)

Corporate seal It any S'ole: No legalization or other witness required

I

Ilog

(11 Ati-fl-s2 G93/719 -2

JN5l1ft5Glow" ~L. -01 1'N ALtH OF AL paT&MS 1999-69

wvIW'9 Patents Act DECLARAKT'ION IN SUPPC ION FOR A PAT in suptport of a Conven TRACK SKIM~ Insert FULL namre(s) of IZWe(b R.C.A. CORPORATION ppplicant(s) I, Edward

()Insert FULL 5269379, 1.I am authorized by RC United States of Amen addressfes) of Of 30 Rockefeller Plaza, New Yor applicant(s) New York 10020, United States 2. The basic application(s Great I

by RCA C01 (FullName(s) of Inue? hereby apply for the grant of a Patent for an invention entitled Insert TIThLE (d) of invention

TRACK SKIPPER FOR VIDEO DISC PLAYER

in.th nted St 6. 0 which is described in the accompanying (Na complete specification. by John Clif (Full Name(s) of Appli *0 (Note: Vie following paragtaph applies only to Convention applications) O tert nume

This applicaton is a Conventiode application based on the basic application(s) for a John C1 (Full Name and Address 00 patent o, Imilar protection identified by number, country. and filing date as follows: k, 0 (f) 12 Cranbrook R 00 0

0 App"Ln. 44739-78 Appin. 39,359 (2) 0 Gre~at Britain United States of America (Full Name and Address 16 Movember, 1978 15 May, 1979

'1 of 0

(gf) Insert nubEr APPLICAT'll ACCUETM

n AM AM4ENO*NTS M~

(4) (Full Name and Address

ii (h)iSignate ofo Full Name and Address (heor body Address for Service: PHILLIPS ORMONDE AND FITZPATRICK Patent and Trade Mark Attorneys I botsiNcleapliation 367 Collins Street (Full Name and Addross or thr ites Melbourne, Australia 3000 I reqire

Dated 1 Novcmber, 1979 is/s&W the actual invento make the application ar( named in Paragraph 3 o: (bi) R.C.A. CORPORATION By their Patent Attorneys, I. The basic Application(s, PHILLIPS OMONDE AND FITZPATRICK made in a Convention c4

4p4 Declared at Princeton, D~

Ifr day of___ (Date)

PHILLIPS ORN40NDE AND FITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street The Commissioner of P

9 1 Patents Act

S(Docket Number)

CDOM -ALTHQFAUSTRALIA Regulation 12(2) P'ATA AF 19S2 69

DECLARArION IN SUPPORT OF A CONVENTION APPLICATION FOR A PATENT

In sup rt of a Convention Application made for a Patent for invention entitled: 52 6 9 3 TRACK SKIPPER FOR VIDEO DISC PTAYRR (Title of Invention)

Edward J. Norton do solemnly and sincerely declare as follows:--

1. I am authorized by RCA CORPORATION of 30 Rockefeller Plaza, New York City, New York 10020, United States of America, the applicant for the patent, to make this declaration on its behalf.

2. The basic application(s) as defined by section 141 of the Actaiax/were made in Great Britain on 16 November 1978 (Name of Priority Country) (Date Filed) by RCA CORPORATION (FullName(s) of Inventor(s), or RCA CORPORATION if First Filed in GreatBritain)

in the United States of Amerina on May 15, 1979 (Name of Second Priority Country) (Date Filed) by John Clifford Bleazey (Full Name(s) of Applicant(s) Inventor(s) or RCA CORPORATION)

3. John Clifford Bleazey (Full Name and Address of FirstInventor) 12 Cranbrook Road, Trenton, New Jersey, United States of America

(2) (Full Name and Address of Second Inventor)

(Full Name and Address of Third Inventor)

(4) ull Name and Address of Fourth Inventor)

(FullName and Addrtess of Fifth Inventor)

is/je the actual inventor6) of the invention and the facts upon which RCA CORPORATION is entitled to make the application are as follows: The said RCA CORPORATION is the assignee of the said inventor() named in Paragraph 3 of this declaration in respect of said invention.

4. The basic Application(s) referred to in Paragraph 2 of this declarationma/were the first application(s) made in a Convention country in respect of the invention the subject of the application.

Declared at Princeton, New Je seyJui.4tates of America, this

iL (Date) day of (Month) 19 19L,79 (Year)

Edward J. Norton, itor Patent Planning inlstration The Commissioner of Patents

(12) AUSTRALIAN PATENT ABRIDGMENT (19) AU (11) AU-B-52 693/79

(54) iRACK SKIPPER FOR VIDEO DISC PLAYER (71) RCA CORPORATION (21) 52 693/79 525 918 (22) 9.11.79 (24) 16.11.78 (31) 7844739 (32) 16.11.78 (33) GB 39359 15.5.79 US

(43) 22.5.80 (44) 9.12.82 2 G11B 3/36 G11B 25/04 (51) G11B 3/10 (72) JOHN CLIFFORD BLEAZEY (74) PO (56) 63 169/80 HI04N 5/83; G11B 3/38 52 694/79 G 11B 3/10; G11B 3/36; G11B 25/04 47 122/79 H 04N 5/76; G11B 21/10; G11B 3/06

(57) Claim 1. a system for recovering prerecorded Apparatus in information from a disc record having a spiral information track by a track-following stylus when stylus/record relative velocity is established; wherein normal opLration of said system involves sensing of said prerecorded information along successive convulutions of said spiral track in a regular progression toward one extremity; said apparatus comprising: a carriage subject to translatory motion in correlation with radial motion of said track-following stylus during playback; said carriage having an opening ii a bottom wall thereof; a stylus arm having a longitudinal axis, and carrying said track-following stylus at one end thereof; means for yieldably securing the end of said stylus arm remote from said one end to said carriage; said yieldable securing means permitting said track-following stylus to protrude through said opening when said stylus arm is lowered during playback;

/2

D1 46* 2

*1l6/b2/20

1 -11- RCA 69,112

(11) AU-B-52 69379 2

a prmanent magnetic element secured to said stylus arm and disposed substantially in the plane of said stylus arm which extends over said record during playback; a single electromagnet for providing a controllable magnetic field of a desired polarity when energized; means for mounting said electromagnet to said carriage such that it is disposed to one side of said stylus arm in the vicinity of said permanent magnetic element; and means for selectively energizing said electromagnet to cause a shift in the radial location of said track-following stylus in a substantially radial direction, said radial direction depending upon the polarity of said controllable magnetic field.

*116/62/21

PHILLIPS ORMONDE AND FITZPATRICK Patent and Trade Mark Attorneys 37Collins Street

ASTAUA525 18 Patents Act

COMPLET7rE SPECIFICATION (ORIGINAL)

Clans It. Class

Appla,,tion Number: 5,19a 63179 Lo~dged:

Complete Specification: Lodged: Accepted: Published:

Priority: u<

Related Art: I 'IIF1

APPLICANT'S REF.: DOCKET NO. 69112 Name(s) of Applicant(s): RCA CORPORATION

'Address(es) or Applicant(#) 30 Rockefeller Plaza, New York City, New York 10020, United States of America.

'Actual Inventor(s): John Clifford IBleazey

4 4 044

Address for Service Is. PHIILLIPS, ORMONDE FITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street Melbourne, Australia, 3000 Complete Specification for the invention entitled:

TRACK SKIPPER FOR VIDEO DISC PLAYER

The following statemdnt Is a full description of this invention, including the best method of performing it known to

-1 a- RCA 69,112 TRACK SKIPPER FOR VIDEO DISC PLAYER

This invention pertains to an apparatus utilized in the playback of a video disc record, and more particularly, to an apparatus for selectively repositioning a player stylus from one convolution to another of a signal-encoded spiral track disposed on the record surface. U. Patent No. 3,842,194, issued on October 1974 to Jon K. Clemens, is illustrative of a video disc Splayback system of the variable capacitance form. In an arrangement therein disclosed, an information track incorp- orates geometric variations in the bottom of a spiral groove in a disc, the surface of which comprises conductive material covered with a thin coating of dielectric material. Vari- ations in the capacitance presented between a conductive electrode on a tracking stylus and the conductive material of the disc occur as the disc is rotated by a supporting turntable. The capacitance variations are sensed to recover the recorded information. In certain applications of video disc systems such as, for example, the Clemens type, it may be desirable to provide repeat plays of the displayed image. That is, to-repetitively provide output signals of basically the same displayed image on an associated television monitor. SSuch image repeat play may be desirable for allowing a viewer to observe a particular image for relatively long lengths of time. A further desirable feature for incorporation S with a video disc player is the ability to provide rapid S: forward motion or reverse motion of the displayed inrage. A rapid forward fuction is particularly useful for quickly scanning information recorded on the video disc. A reverse motion function may also be utilized for aiding in data retrieval, and is particularly useful as a teaching aid for reviewing an instructional picture sequence recorded on the disc. Moreover, in the playback of video disc records conditions are occasionally encountered when the presence of some form of defect, for example a defect in the disc

1-2- RCA 69,112 groove, causes the player stylus to skip across convolutions of the information track rather than follow the successive convolutions of the spiral track in a regular progression toward one extremity thereof. For example, as the defect is encountered, the stylus may be deflected into repeat traversal -of one or more previously traversed convolutions. In some instances, the outward deflection of the stylus is repeated for a substantial number of successive encounters with the defect. This condition is herein referred to as a "locked groove" condition, producing repetitive replay of the same recorded information, with annoying effects on picture display and accompanying sound reproduction. 44 44 *4 4 To provide special effect features repeat '4 '4 '4 15 play, fast forward, reverse, trick plays, etc.) and to Qtc. '4 4 4 4. 944 4 advance the stylus out of a locked groove, it is desirable 44. 04 4 to provide a selectively actuated apparatus for reposi- '4 tioning the pickup stylus from one convolution to an~other *4 4

44 of the record spiral track. 4. 4.

4. 4.4 00 '4 20 U.S. Patent No. 3,963,461, issued on June 15, 1976 '4 '4 4 0 to H.N. Crooks, and U.S. Patent No. 3,993,863, issued on November 23, 1976 to Leedom, et al., describe illustrative groove skipping systems. In these systems, selectively '4 *0 4.4 4 actuated piezoelectric Limorph elements cause lateral shift- '4, 44. 25 ing of the stylus-carrying end of the stylus arm,, 4 tO4

4 An advantageous arrangement for selecotively 4

4. 4. 44' 4 indexing the stylus from one convolution to another is 444.444 4 herein described. Pursuant to this invention, the apparatus includes a playback stylus attached to the stylus arm near '4*44 4. '4 '4 30 its free end. A rubber coupler secures the other end of the stylus arm to a carriage, which is subject to trans- lation in correlation with the motion of the stylus toward the record center during playback. Disposed near the free end of the stylus arm is a magnetic element. An elect 7o- magnet is fixedly mounted in the carri age in the vicinity of the magnetic element. Actuation of the electromagnet results in a change in the radial location of the stylus in the appropriate direction. 7' 44 4J 4 1 4 A desirable feature of this invention is that

k7.

1 RCA 69,112 the net force experienced by the stylus arm is relatively independent of the position of the stylus. For example, in the event of a number of locked grooves occurring on a record, the stylus arm is repeatedly advanced toward the record center by the indexing apparatus of this invention. The movement of the stylus arm toward the record center reduces the spacing between the stylus arm-mounted, magnetic element and the electromagnet, and also develops a mechanical bias urging the stylus arm away from the record center because of the rear rubber coupler. This mechanical bias is automatically compensated for in the instant apparatus since the force on the stylus arm is increased automatically because of the reduction in the spacing between the magnetic element and the electromagnet. In accordance with a further embodiment, an electromagnet is placed on each side of the stylus arm- mounted, magnetic element to selectively effect forward 2(i.e. toward the record center) as well as reverse motion 20 of the stylus. Alternately, the combination of a stylus arm-mounted, permanent magnet and a single electromagnet can be substituted for the foregoing arrangement to ef ect forward and reverse motion of the stylus. BIn the drawings: FIGURE 1 is a block diagram representation of a video disc player incorporating the track skipper apparatus of this invention; FIGURE 2 illustrates a pickup cartridge suitable for use in the video disc player of FIGURE 1; FIGURE 3 shows an enlarged view of a portion of the pickup cartridge of FIGURE 2; FIGURE 4 depicts a carriage having a compartment for receiving the pickup cartridge of FIGURES 2 and 3; FIGURE 5 is an enlarged view of a portion of 3 the carriage of FIGURE 4; FIGURE 6 diagrammatically illustrates another embodiment of the track skipper apparatus of this invention suitable for use with the video disc player of FIGURE 1; FIGURES 7 and 8 show a still further embodiment

-~~lllllli11~3~ -4 fl, rr'WY1ZQIIII tfl #rnr~rrrrnwf -s a

1 RCA 69,112

of the track skipper'apparatus of this invention also suit- able for use with the video disc player of FIGURE 1; and FIGURE 9 illustrates another embodiment of the invention suitable for use with the video disc player of FIGURE i. FIGURE 1 represents a video disc playback system incorporating circuitry utilized for operating the track skipper apparatus of this invention. The circuitry :nown in i0 1 FIGURE 1 is of the type described in the Crooks (3,963,861) and Leedom et al. (3,993,863) patents. A video disc player has a turntable 12 for rotatably supporting a video disc 14 having a spiral information track disposed thereon. A carriage 16, having a compartment for removably receiving

ra pickup cartridge 18, is subject to translation in synch- ronism with the motion of the playback stylus towward the record center during playback. The carriage drive mechanism illustratively may be of the type described in U.S. patent SNo. 3,870,835 (Stave). Capacitance variations between the record and an electrode incorporated in the playback stylus are coupled to a signal developing circuit 20 wherein decoding occurs and a composite video signal developed. The signals developed by the signal developing circuit 20 are coupled S to a signal processing circuit 22 and a sync stripping circuit 24. The signal processing circuit 22 rearranges the luminance and chrominance constituents of the video signal into a format (such as NTSC) suitable for decoding by a television receiver 26. Sync signals provided by the sync stripping circuit 24 are coupled to a sync counting circuit 28, which in response to signals from a control unit 30 provides an output signal which repetitiously occurs at a predetermined whole number division of the frequency of the applied vertical sync signals. A drive pulse gener- ating circuit 32 receives signals from both the sync counting circuit 28 and the control circuit 30, and responsively provides appropriate control pulses. These control pulses are applied to the track skipper apparatus for selectively causing the playback stylus to skip in the forward and the

1 RCA 69,112

reverse direction depending upon the manner in which the control pulses are applied. To provide the repeat play function, the playback stylus is repeatedly repositioned to an adjac nt :ter convolution of the spiral track disposed on o:ord once each revolution of the record by means of tiae instant track skipper apparatus. The drive pulse generating the circuit 32 responsive to the control circuit 30 and sync counting circuit 28, provides appropriate pulses at the once-around rate of the turntable to cause the stylus to skip backward once each revolution. The fast forward function may be implemented by

causing the pickup stylus to skip for;ard, for example, once every one-half revolution of the record. Similarly reverse motion may be effected by causing the stylus to skip backward once every one-half convolution of the record. For locked groove clearance purposes, detection circuitry 34 of the type delineated in U.S. patent No. 3,963,860 (Burrus) may be utilized to detect the occurrence of a locked groove condition. The stylus is advanced in the forward direction by actuation of the subject track skipper apparatus upon generation of a

locked groove recognition pdise. A track skipper apparatus in accordance with the instant invention will now be described in detail with reference to FIGURES 2 5. Shown in FIGURE 2 is the pickup cartridge 18. The cartridge comprises a stylus arm 50 which carries at the free end

thereof a stylus holder 52. A pickup stylus 54 is secured to the stylus holder 52. An extension 56, disposed on the stylus holder 52, is interposed between a-pair of non- magnetic, plastic bumpers (not shown) mounted on the carriage 16. The bumpers serve to limit side-to-side excursion of the stylus 54. The other end of the stylus arm 50 is secured to a connector plate 62 via a compliant coupler 64. A flexible diaphragm 66 secures the connector plate 62 to the cartridge body 68. A U-shaped spring 70 serves to retain the stylus

1 RCA 69,112

assembly within the confines of the cartridge 18 during storage and handling. A conductive leaf spring 72 connects an electrode incorporated in the stylus (not shown) to a terminal (not shown) disposed on the cartridge 18. Cartridge 18 is removably received in the carriage 16 (FIGURE As previously indicated, the carriage is subject to translation toward the record center in cor- y relation with the radial motion of thdL sy!.w daring play- back, for example, in the manner desorioRn in U.S. patent No. 3,870,835 (Stave). Mounted in the carriage 16 are a stylus arm lifting/lowering mechanism 82 and an arm stretcher apparatus 84. The stylus arm lifting/lowering mechanism is of the type described in U.S. patent No. 4,053,161 issued to J. C. Bleazey, et al. on October 11, 1977. The lifting/ lowering mechanism serves to gently lower the pickup stylus 54 on the video disc for playback. The mechanism 82 also serves to lift the stylus away from the record, for example, for allowing the stylus to clear the peripheral bead of the record as the carriage is translated from the off- record, rest position to the on-record, play position, o•or for example, when the player is in the pause mode. shown in FIGURE 4, the arm stretcher apparatus 84 is provided with a support 86. When the cartridge 18 is installed in the compartment 80 and the lid 88 of the carriage 16 is closed, a mechanism 90, responsive to the lid movement, effects engagement between the connector plate 62 of the cartridge and the support 86 of the arm stretcher. The mechanism 90 also serves to effect engage- ment between the cartridge terminal and another terminal 92 disposed on the carriage 16 for electrically connecting the stylus electrode to the rest of the player circuitry. The support 86 of the arm stretcher apparatus 84 imparts translatory motion to the stylus arm in a manner that opposes cyclical deviations in the stylus/record relative velocity during playback. The cyclical deviations in the stylus/record relative velocity result from a number of sources, tor example, eccentricity, warp, etc. U.S. patent

RCA 69,112

No. 3,983,318 (Miller\ describes an illustrative arm the st: stretcher apparatus. undesi. The bottom wall of the carriage has an opening that a3 94 for permitting the playback stylus to protrude there- a funci through during playback to effect stylus/record engagement distan< when the stylus arm is lowered by the stylus arm lifting/ magnet lowering mechanism 82. A lever (not shown) disposed on the lid 88 shown 10 300 an( serves to defeat the U-shaped, stylus arm retaining spring allowing the stylus arm to rest on an arm 96 of the sides lifting/lowering mechanism 82, when the lid is closed after 308. installing the cartridge 18 in the carriage compartment. obtain( s.t 40 ft t ft

Secured to the stylus arm 50, near its free end, a ft 4 magnet 15 is a magnetic element 100 (FIGURES 2 and An electro- binati magnet 102 is fixedly mounted in the carriage such that and a the pole faces 104 and 106 thereof are disposed adjacent shown ft a f

to the stylus arm-mounted magnetic element. A winding 108 forwar 00 00

(FIGURE 5) of the electromagnet is coupled to the drive ft ft 0 af of mot ft) 0

pulse generating circuit 32 of FIGURE 1. Actuation of the of the electromagnet causes the poles to exert a pull on the stylus ft 40 the co of

arm-mounted magnetic element, which results in a radially af *0 f f

inward displacement forward motion) of the stylus. inform If both forward and backward motion of the stylus is de- the el sired, an electromagnet may be provided on each side of are ap the magnetic element in the manner described subsequently. arm ca In the embodiment shown in FIGURE 6, a stylus moveme arm 200 carrying a stylus 202 at one end thereof, has the moved other end secured to a pickup cartridge 204 by a compliant 3 groove 30 rubber coupler 206. The pickup cartridge is received in of the a translatably-mounted carriage 208. A magnetic element applie 210 is secured to the stylv.s arm 200 at a distance from from t the stylus 202. An electromagnet 212 is fixedly mounted ing of in the carriage in the vicinity of the magnetic element. 3 least The electromagnet 212 comprises a horseshoe-shaped core arm li 214 having pole faces 216 and 218, and a winding 220 forces disposed about the central portion of the core. An actuating -irect signal, for example, indicative of a backward groove skip applied to the winding to advance will 1 due to a locked groove, is

1 RCA 69,112

the stylus in the forward direction in order to avoid undesirable repeat play. The number of convolutions that are skipped every time the electromagnet is pulsed is a function of the magnitude of the actuation pulse and the distance between the magnetic element 210 and the electro- magnet 212. A still further embodiment of this invention is in FIGURES 7 and 8. As shown therein, electromagnets B0 shown 300 and 302 are disposed in the carriage 304 on opposite sides of a magnetic element 306 mounted on the stylus arm 308. Forward and backward motion of the:stylus can be *0 ttS obtained by energizing the inner and the outer electro- m4gnets 300 and 302 respectively. Alternately, the com- M B bination of a stylus arm-mounted, permanent magnet 400 and a single electromagnet 402 can be substituted, as *e shown in FIGURE 9, for the foregoing arrangement to effect forward and reverse motion of the stylus. The direction of motion of the stylus is controlled by the direction E. 20of the current flow through the winding 404 disposed about the core 406 of the electromagnet. In a video disc system which utilizes a grooved Ct° information track, the application of control signals to

25Sthe electromagnet and the resulting magnetic forces which are applied to the permanent magnet positioned on the stylas arm cause the stylus arm to experience the desired radial movement. When the stylus arm is thus being radially moved it is believed that the stylus tip rides up the 30groove wall in one convolution and down the groove wall of the adjacent convolution, or, if a large signal is applied, down the groove wall several convolutions away from the starting convolution. As a result of the position- ing of the permanent magnet on the stylus arm, or, at least in the near viciflity of the plane in which the stylus arm lies during playback, the application of the magnetic forces causes thd generally lateral movement in the radial Lirection of the stylus tip in the manner described. The track skipper arrangement described herein

will be useful in many video disc systems over and above

_-r in-- wf~~

RCA 6 9, 112

the general system environment described herein for illus- trative purposes. Without limitation, the present track skipper may be utilized in systems with grooved as well as Sgrooveless discs.

-f

~~Ptt

I. ~tt.

The cla

informa track b re lat iv of said along s re--g Ular- compris

c,,)rre la div.-Ing

carryir

arm in

to cau f ollow radial, contrc'

4 SD

Claims (3)

1. The claims defining the invention are as follows. 1. Apparatus in a system for recovering prerecorded information from a disc record having a spiral information track by a track-following stylus when stylus/record relative velocity is established; wherein normal operati.on of said system involves sensing of said prerecorded information along successive convulutions of said spiral track in a regular progression toward one extremity; said apparat;' comprising: a carriage subject to translatory motion in correlation with radial iotion of said track-following stylus dui.ing playback; said carriage having an opening in a bottom wall thereof; a stylus arn having a longitudinal axis, and carrying said track-following stylus at one end thereof; means for yieldably securing the end of said stylus arm remote from said one end to said carriage; said yieldable securing means per' itting said track-following stylus to protrude through said opening when said stylus arm is lowered during playback; a permanent magnetic el.ement secured to said stylus arm and disposed substantially in the plane of said stylus arm which extends over said record during playback; a single electromagnet fox providing a controllable magnetic field of a desired polarity when energized; means for mounting said electromagnet to said carriage such that it is disposed to one side of said stylus arm in the vicinity of said permanent magnetic element; and means for selectively energizing said electromagnet to cause a shift in the radial location of said track- following stylus in a substantially radial direction, said radial di,rection depending upon the polarity of said contrc'llable magnetic field.

   S SD 10

   *116/b2/20

   4

   -11- RCA 69,112
2. 2. The appa tus as defined in Claim 1 wherein said magnetic element is permanently magnetized in a given direction; said electromagnet comprising a core and a Vinding disposed about said core; said aj..r:atus further including means for passing current through said winding; the direction of motion of said stylus being determined by the direction of the current passing through said winding.
3. 3. A track skipper apparatus substantially as herein described with reference to figures 1 to 5, 6, 7 and 8, or 9 of the accompanying drawings.

   s e

   DATED: 1 November, 1979 0 PHILLIPS ORMONDE AND FITZPATRICK SAttorneys fort .O RCA CORPORATION I A

   S

   ~II II iI I I Lm condit The following statement isa full description of this invention, including the best method of performing it known to of som applicant(s):

   52, 693/79

   RECEIVER

   Bt) 00

   a a

   0 0 0 *8 00 it a it Ca a it it it *0 000* sit I it it o a a a it a it a 'it. 80 I, a a a a a 4- i, a a a- it,., a

   00 B it so, o cit a a #0 o Ba 0 COO it a itsOit

   it a a 411,0 0

   411D

   *soi G 01,041 'a a it, a

   a, V it it asa *,aaa a a a a 04,

   a

   Fig. 2. a 8*8*

   s-s a aa

   Fig.3J.

   0tr A/z/

   .oto *0 S S

   o 0 0 0 9 00r S0 40 QQO* t

   CC C CCC CCC CC e.g. Ce C C C C C 0 C C. C a C C CC C C C C C C CCC CCC CC. CC CC C C CCC C C C C. *CC~

   FIGURES 7 and 8 show a still further embodiment causi

   09 so** 00 S.

   3* 33 3 3 9 S 3

   33 3@ 3.

   Fig. 4. 3. 3 3 3 3 .3.3

   3* 9 33

   9 3

   03 3 3 3 3 333 3

   .3.3 33 33 3

   .3 3 3*3

   3

   S

   3

   .3.333 3

   33.. 33 @3

   Fig.

   iJ~..JLL.X U

   causing the playback stylus to skip in the forward and the

   Fig. 6. 66 *6 6 6 E. 6 6 *666 6W 6* 66 66 6 6 0 6 *0*6

   @6 66 6 Fig. 7, 6t~ 6 66 6 6 6 6 660 9

   *666 06 66 6

   66 666 Fig. 8. 6

   606@'s 6 6 6 660666 6

   CARTRIDGE 6660 *6 66 6

   406 S NCSrARIAGE

   400 Fig. 9. 404 STYLUS ARM

   Ii1