CA1076255A - Lid interlock and turntable brake system - Google Patents
Lid interlock and turntable brake systemInfo
- Publication number
- CA1076255A CA1076255A CA237,828A CA237828A CA1076255A CA 1076255 A CA1076255 A CA 1076255A CA 237828 A CA237828 A CA 237828A CA 1076255 A CA1076255 A CA 1076255A
- Authority
- CA
- Canada
- Prior art keywords
- lid
- condition
- base
- housing
- cam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
- Feeding And Guiding Record Carriers (AREA)
- Rotational Drive Of Disk (AREA)
Abstract
RCA 68,900 LID INTERLOCK AND TURNTABLE
BREAK SYSTEM
Abstract of the Disclosure A lid is hinged to the base of a disc record player for movement between a closed position and an open position. A lid latch member is mounted in the base for securely holding the lid in the closed position, and releasing the lid in response to manipulation of a lid release lever. A cam is mounted in the base for movement between a first condition decoupling, and a second condition intercoupling, the release lever and the latch member. A linkage is provided between the cam and a signal pickup housing of the player for moving the cam into the first condition when the housing is in a playback mode whereat manipulation of the release lever is ineffective to release the lid, and into the second condition when the housing is in a standby mode whereat the latch member responsive to manipulation of the lever releases the lid, if the lid were closed. In accordance with a further feature of the invention, a turntable brake mechanism is provided for braking the turntable when the lid is opened while the turntable is rotating.
BREAK SYSTEM
Abstract of the Disclosure A lid is hinged to the base of a disc record player for movement between a closed position and an open position. A lid latch member is mounted in the base for securely holding the lid in the closed position, and releasing the lid in response to manipulation of a lid release lever. A cam is mounted in the base for movement between a first condition decoupling, and a second condition intercoupling, the release lever and the latch member. A linkage is provided between the cam and a signal pickup housing of the player for moving the cam into the first condition when the housing is in a playback mode whereat manipulation of the release lever is ineffective to release the lid, and into the second condition when the housing is in a standby mode whereat the latch member responsive to manipulation of the lever releases the lid, if the lid were closed. In accordance with a further feature of the invention, a turntable brake mechanism is provided for braking the turntable when the lid is opened while the turntable is rotating.
Description
RCA 68,900 ~07GZ55 The present invention relates to disc record player systems, and more particularly relates to a lid interlock apparatus for (l) preventing openlng of the player lid during playback, and ~2) braking the turntable when the lid is opened while the turntable,is rota~ing.
In certain video disc systems, video information -is recorded by means of geometric variations in the bottom of a smooth spiral groove on the surface of a disc record.
The disc record surface includes a coating of conductive material which is preferabIy covered with a thin deposit of dielectric material. A signal pickup, supported at one end of a pickup arm, engages the spiral groove and includes a conductive electrode which establishes a capacitance with ' ,' the conductive coating and the dielectric ~eposit of the ' disc record. When the disc record is rotated, the electrode- ' disc capacitance varies in response to the geometric variations in the bottom of the spiral groove passing beneath the signal pickup. The capacitance variations are converted to electrical signal variations by a suitable signal processing clrcuitry coupled to the pickup electrode.
The output signal of the signal processing circuitry may be coupled, to a conventional television receiver for , reproduction. The pickup arm is mounted within a si~nal pickup housing of the playback system. A system of the aforementioned type is described in detail in U.S. Patent No. 3,842,194, issued on October 15, 1974 to Jon K. Clemens.
Video disc systems of the aforementioned type
In certain video disc systems, video information -is recorded by means of geometric variations in the bottom of a smooth spiral groove on the surface of a disc record.
The disc record surface includes a coating of conductive material which is preferabIy covered with a thin deposit of dielectric material. A signal pickup, supported at one end of a pickup arm, engages the spiral groove and includes a conductive electrode which establishes a capacitance with ' ,' the conductive coating and the dielectric ~eposit of the ' disc record. When the disc record is rotated, the electrode- ' disc capacitance varies in response to the geometric variations in the bottom of the spiral groove passing beneath the signal pickup. The capacitance variations are converted to electrical signal variations by a suitable signal processing clrcuitry coupled to the pickup electrode.
The output signal of the signal processing circuitry may be coupled, to a conventional television receiver for , reproduction. The pickup arm is mounted within a si~nal pickup housing of the playback system. A system of the aforementioned type is described in detail in U.S. Patent No. 3,842,194, issued on October 15, 1974 to Jon K. Clemens.
Video disc systems of the aforementioned type
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;
RCA 68,900 ~76255 1 generally utilize disc records having groove denslties in the order of four to eight thousand groove convolutions per inch. A typical video disc record of this type may have a groov~ convolution spacing in the order of 3.5 microns.
The fragile walls of relatively narrow grooves of the disc record cannot be dependably relied upon to pull the pickup arm assembly, around the pickup arm pivot support, across the entire recorded surface of the disc record. Also, in video disc systems utilizing the variable capacitor concept, 1~ it is desirable for accurate reproduction of the prerecorded -signals that the signal pickup electrode maintain a sub-stantially constant attitude in the spiral groove. There-fore, a radial feed drive mechanism is provided for traversing the signal pickup housing in proper time re].ation.
lS ship with ~the radial motion of the signal pickup t~p engaged in the spiral groove so as to continuously maintain the longitudinal axis of the pickup arm substantially tangential to the spiral groove at the point of engagement when the ;
player is i~ a playback mode. Reference may be made to U.S.
Patent No. 3,870,835 (Stave), issued 3-11-75,entitled "Stylus Control Apparatus For A Video Disa Record Player", for an illustration of a suitable radial feed drive mechanism for providiny the indicated radial mot1on.
Further, in the aforesaid video disc systems, .
adequate bandwidth for monochrome and color display is obtained by rotating the disc at a speed substantially :~ .
higher (e~.g.,~450 rpm) than the conventional audio playback speeds (e.g., 33 and one-third rpm).
Additionally, in the above-mentioned video disc
;
RCA 68,900 ~76255 1 generally utilize disc records having groove denslties in the order of four to eight thousand groove convolutions per inch. A typical video disc record of this type may have a groov~ convolution spacing in the order of 3.5 microns.
The fragile walls of relatively narrow grooves of the disc record cannot be dependably relied upon to pull the pickup arm assembly, around the pickup arm pivot support, across the entire recorded surface of the disc record. Also, in video disc systems utilizing the variable capacitor concept, 1~ it is desirable for accurate reproduction of the prerecorded -signals that the signal pickup electrode maintain a sub-stantially constant attitude in the spiral groove. There-fore, a radial feed drive mechanism is provided for traversing the signal pickup housing in proper time re].ation.
lS ship with ~the radial motion of the signal pickup t~p engaged in the spiral groove so as to continuously maintain the longitudinal axis of the pickup arm substantially tangential to the spiral groove at the point of engagement when the ;
player is i~ a playback mode. Reference may be made to U.S.
Patent No. 3,870,835 (Stave), issued 3-11-75,entitled "Stylus Control Apparatus For A Video Disa Record Player", for an illustration of a suitable radial feed drive mechanism for providiny the indicated radial mot1on.
Further, in the aforesaid video disc systems, .
adequate bandwidth for monochrome and color display is obtained by rotating the disc at a speed substantially :~ .
higher (e~.g.,~450 rpm) than the conventional audio playback speeds (e.g., 33 and one-third rpm).
Additionally, in the above-mentioned video disc
- 3 -i ~
'" ' RCA 68,900 ~q6~55 1 systems, groove engaging and low mass requirements of a signal pickup assembly result in a plckup arm unit which is extremely fragile (e.g., signal pickup width 2 microns, signal pickup depth 5 microns, signal pickup electrode width 2 microns, and signal pickup electrode depth 0.2 microns).
In the playback systems of the aforementioned type the following considerations may be encountered~ It is desirable to prevent opening of the lid when the signal pickup housing is in the playback mode in order to protect the fragile signal pickup assembly of the player.
It is also advantageous to brake the turntable when the lid i5 opened while the turntable is rotating at relatively high speed (e.g., 450 rpm) in order to reduce safety hazard to the player user.
It may be preferable to preclude opening of the lid until the signal pickup housing has cleared the disc record so that the record just played may be removed for changing side, or placing a new disc record on the turntable without hindrance.
Pursuant to an illustrative embodiment of the present invention, a lid is pivoted to the base of a disc record player for movement between a closed position and an open position. A lid latch member .is mounted Eor securely holding the li.d in the closed position, and releasing the lid in responsa to manipulation of a lid release lever. Means operative between a first condition decoupling, and a second condition intercoupl1ng, the release lever and the latch member is
'" ' RCA 68,900 ~q6~55 1 systems, groove engaging and low mass requirements of a signal pickup assembly result in a plckup arm unit which is extremely fragile (e.g., signal pickup width 2 microns, signal pickup depth 5 microns, signal pickup electrode width 2 microns, and signal pickup electrode depth 0.2 microns).
In the playback systems of the aforementioned type the following considerations may be encountered~ It is desirable to prevent opening of the lid when the signal pickup housing is in the playback mode in order to protect the fragile signal pickup assembly of the player.
It is also advantageous to brake the turntable when the lid i5 opened while the turntable is rotating at relatively high speed (e.g., 450 rpm) in order to reduce safety hazard to the player user.
It may be preferable to preclude opening of the lid until the signal pickup housing has cleared the disc record so that the record just played may be removed for changing side, or placing a new disc record on the turntable without hindrance.
Pursuant to an illustrative embodiment of the present invention, a lid is pivoted to the base of a disc record player for movement between a closed position and an open position. A lid latch member .is mounted Eor securely holding the li.d in the closed position, and releasing the lid in responsa to manipulation of a lid release lever. Means operative between a first condition decoupling, and a second condition intercoupl1ng, the release lever and the latch member is
- 4 - ~
~, ~
1076255 RCA 68,900 1 provided. Means interconnecting the operative means and a signal pickup housing of the player is effective for aisposing the operative means into the first condition when the housing is in a playback mode whereat manipulation of the release lever is ineffective to release the lid, and into the second condition when the housing is in a standby mode whereat the latch member responsive to manipulation of the lever releases the lid, if the lid were closed.
Pursuant to a further feature of the invention, a turntable brake mechanism is provided for braking the turntable when the lid is opened while the turntable is rotating.
.' :
Objects, features, and advantages of the present invention will be more fully understood from the following detailed description of the preferred embod~ment, t~e appended c1a1ms, and the accompanying drawings in whic~:
FIGURE l is a plan view of a video disc player incorporating an illustrati.ve embodiment of a lid interlock apparatus according to the present invention, the lid of the player is shown in an open position for clarity;
FIGURE 2 is a side view of the video disc player o~ FIGURE l FIGURE 3 is a partially cut-away, perspective : :.
view of the~lid interlock apparatus suitable for use with the player of FIGURES l and 2; ~ ;;
FIGURE 4 is a front view of a portion of the lid interlock apparatus of FIGURE 3;
FIGURE 5 is a partially cut-away, sectioned side : . ~.. ,.. :, ' RCA 68, 900 :~76~S5 1 view of the lid interlock apparatus along the line X-X in FIGURE 4i FI~URE 6 diagrammatically'illustrates a turntable brake mechanism suitable for use with the lid interlock apparatus of FIGURES 3, 4, and 5; and FIGURE 7 iS a partially cut-away, perspective view of a modified lid interlock apparatus according to another embodiment of the present invention.
.,~
~Referring to the drawings, wherein like reference ,~' numerals designate similar elements in the various views, in FIGURES l and 2 a video disc player is~shown having a base lO. A lid ll is pivoted to the base lO for movement between a closed position and an open position. The player is suitable for use in a video disc system such as disclosed in the aforementioned Clemens patent. A turntable 12 is rotatably mounted on the base lO. The upper surface of the turntable 12 is adapted to support a video disc record 13.
Video informat1on is recorded by means of geometrical variations 1n;the bottom of a smooth spiral groove 14 on the substrate Oe the disc record 13. The disc record 13 sur~ace includes a conductive coatiny which is preferably covered ', with a thin deposit of dielectric material. A signal pickup .. , ~ .
15, supported at one end of a conductive pickup arm 16, engages the spiral groove 14 and includes a conductive electrode (not shownj which, ~,ogèther with the conductive coating and the dieleatr1c deposit, form a capacitor. When relative motion is established between the signal pickup 15 ~ , .
and the disc record 13j an edge of the electrode included , in the signal pickupj~ while riding in the~spiral groove 14, ., :
RCA 68 ,900 ~76~55 1 serves as an electrode of a capacitor varying due to the geometric variations in the bottom of a smooth spiral groove passing beneath. The other end oE the plckup ~rm 16 is flexibly supported by a pickup arm support carried by a signal pickup housing 17.
As indicated before, a radial feed drive mechanism 18 traverses the pickup arm support mounted in signal pickup housing 17~in proper time relationship with the radial motion of the slgnal pickup 15 tip engaged in the spiral groove 14 so as to continuously maintain the longitudinal axis of the pickup arm substantially tangential to the spiral groove at th~ point of engagement. A slot 28 is provided in the base 10 for accommodating the radial motion of the housing 17. Reference may be made to the afore-menti.oned Stave patent (U.S. Patent No. 3,870,835) for an illustration of a suitable feed drive mechanism for providing the indicated radial motion.
During playback, the pickup arm 16 passes through an opening 19 in the bottom wall of the housing to allow the signal pickup L5 to ride in the spiral groove 14. A ;
pivotally mounted bracket 20 lifts the free end of the pickup arm 16 to disengage the siynal pickup 15 from the spiral groove 14 when the player is inoperativeO
A plurality of push buttons 21, 22, 23, 24, 2S 25, and 26 are provided along the front panel 27 for, respectively, effecting the following functions: start, . . . .
pause, rejèct, fast forward, reverse, and lid release. ;~
A lip 29 lS fastened to the lid 11 for entry into an opening 30 provided in the base 10 in order to engage a ~
30~ latch member of a lid interlock apparatus 31 to be described ;
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RCA 68,900 1 subsequently. A plunger/of a turntable brake mechanism 32 is reciprocably mounted in the base lO for cooperation with the lid ll in the manner also to be described subsequently.
Reference will now be made to FIGURES 3, 4, and 5.
FIGURE 3 is a partially cut-away, perspective view of the lid interlock apparatus 31. FIGURES 4 and 5 are, respec-tively, th front view and a partially sectioned side view of a portion of the lid interlock apparatus of FIGURE 3.
A latch member comprises a plate 33 pivotally mounted on the base lO for movement between (l) a protruding position, and (2) a retracted position. A first tab 34 is secured to the plate 33 for (a) engagement with an aperture 35 provided in the lip ~9 of the lid ll when the plate 33 is in the protruding position, and (b) releasing the lip when the plate is in retracted position, if the lid is closed. A wire spring 36 is inserted into an opening ., 37 provided in a tab 38 fastened to the plate 33 in a manner that biases the plate in the protruding position.
The first tab 34 has a slanting top surface in order to facilitate gradual shi~ting of the plate 33 to the retracted position by the lip 29 as the lip is inserted into the :
. ., opening 30 provided in the base lO. The wire spring 36 pushes the first tab 34 into the aperture 35 disposed in the lip 29 thereby securely holding the lid 1l to the base lO. A second tab 39 is secured to the plate 33 ~or engagement~with one end of a slide member 40 reciprocably mounted to a bracket 41 attached to the base~lO. Elongated slots 42 and 43 are provided in the slide 40 for cooperation with pins 44 and 45 fastened to the bracket 41 thereby permitting reciprocating movement of the slide with respect ' ,; :
' RCA 68,900 ~1:176255 1 to the bracket. The second tab 39 has a slanting bottom surface in order to facilitate gradual movement of the plate 33 against the sprlng 36 to the retracted position by the one end of the slide 40 as the slide ls pushed upward.
The slid'e 40 has a neck portion 46 at the second end forming a shoulder portion 47 at the second end of the slide. A lid release lever 48, carrying the push button 26, is pivotally mounted on a frame 49 attached to the base l0.
An open-ended slot 50 is pro~ided at one end of the lid release lever 48 for freely receiving the~neck portion 46 of the slide 40. When the push button 26 is depressed, the lid release lever 48 engages the shoulder portion ~7 of the sl'ide pushing the slide upward. The upward mot~on of the slide causes the plate 33 to retract thereb~
releasing the lid ll, if the lid were closed. Means are '; ;
provided for biasing the lid ll in the open position and ~' the push button 26 in an elevated position.
A cam 51 is pivotally mounted on the bracket 41 . , .
by a pin 52 attached to the bracket on the side opposite of the slide 40. A retainer 52' positions the cam 51 on the ,, pin 52. The cam Sl is movable between (l) a'first condition `"i"' ""' decoupling, and (2) a second condition intercoupling, the release lever 48 and the latch member plate 33. Orientation of tho cam 51 in the first condition renders the lid ~5 release lever 48 immovable because a tounge portion 53 ~
of the cam~blocks the manipulation of the lever. Orientation ~; ', of the cam'5L in the second condition (as illustrated in ' , FIGURES 3j 4, and 5) fre~s the manipulation'of the lever 48. -,~
.. : :
Means 54 are provided for interconnecting the cam 51 and the housing 17. The radial feed drive 18 drives _ g _ ' ~ , .
RCA 68,90n 1~76Z55 1 the housing 17 between a standby mode and the playback mode.
The interconnecting means 54 is eEfective for moving the cam 51 (a~ into the first condition when the housing 17 is in the playback mode whereat manipulation of the release lever 48 is ineffective to release the lid 11, and (b) into the second condition when the housing is in the off the record disc standby mode (such as shown in FIGURE 1) whereat the latch member responsive to manipulation of the lever releases the lid, if the lid were closed.
Illustratively, the interconnecting means 54 comprises a first hub 55 pivotally mounted in the base 10.
A pin 56 is secured to the hub 55 for engagement with a downwardly depending tab 57 coupled to the housing 17.
When the housing 17 moves from the playback mode to the standby mode, the tab 57 engages the pin 56 and rotates the hub 55 in clockwise direction when viewed from the ;:
top. A second hub 58 is mounted in the base for rotation with the~.first hub 55. A pin 59 is secured to the second hub 58. A cord 60 interconnects the cam 51 and the pin 59 attached to the hub 58. A pulley 61 is mounted on a bracket attached to the frame 49 of the base 10. The pulley 61 guides the cord 60 such that clockwise rotation of the hubs (55 and 58), as the housing 17 moves from the playback mode to the standby mode, causes the cam 51 to move to the second condition, thereby freeing the lid release .
lever 48 to operate the latch member for releasing the ~ :
lid 11.
A wire spring 62 is provided for biasing the cam in the first condition, whereby when the housing 17 is in the playback mode manipulation of the lid release lever 48 is ineffective to release the lid 11.
1076Z55 RCA 68,900 1 A safety spring 63 may be inserted in the cord 60 to prevent damage in the event of mechanical failure, such as jamming.
An opening 64 is provided in the base lO, as shown in FIGURE 5j for the purpose of releasing the lid ll by pushing the,slide 40 upward, irrespective of the position of the cam Sl. 32 The turntable bxake mechanism/w1ll now be explained by reference to FIGURE 6. A plunger 65 is reciprocably mounted in the base lO for movement between (l) a first position when the lid ll is released open, and (2) a second ;' position when the lid is closed, in response to the lid movement. A spring 66 is inserted between a retainer 70, attached to the plunger 65, and the base lO~for biasing the plunger in the first position. A frict~on pad 67 ~s ~, secured to the other end of a bracket 68 attached to t~e plunger 65(for engagement with the underside of the turn~
table 12 when the plunger is in the first position effecting braking o$'the turntable when the lid ll is opened while the turntable is rotating. A slot 69 is cut into the base lO for permitting reciprocal motion of the bracket 68.
The movement of the plunger 65, when the lid ll : : -is opened,,may be advantageously utilized to cut off power ,;
to the turntable drive motion (not shown), thereby further , . :
reducing the safety hazard. ' Thus, the described lid interlock a~arat1~ maY be . . .
used to (l) prevent opening of the lid during playback, or ~2) brake thè turntable when the lid is opened while the turntable is rotating at a relatively high speed or both. '' '' ~ ~FIGURE 7 is a partially cut-away, perspective ..", . . .
. .
. . i .- : : . . .: : . :
RCA 68 ,900 ~a~7~;~Z~iS
1 view of a modified interloc]c apparatus according to another embodiment of the present invention. In the FIGURE 7 embodiment the cam 51 is mounted on the reciprocating slide 40 instead of on the fixed bracket 41. The cam 51 ls positionable between (1) a first condition intercoupling, and (2) a second condition decoupling (as illustrated in FIGURE 7), the release lever 48 and the slide 40. When the cam 51 is in the second condition, the latch member structure does not obstruct movement of the lever 48 as the shoulder portions 47 of the slide 40 do not engage the lever through-out the range of movement of khe lever (in contradistinction to arrangement of FIGURES 3, 4, and 5). The reason for the FIGURE 7~arrangement is that it protects the lid inter-lock apparatus from damage in the event of accidental pushing of the lever 48 when the housing 17 is in the play-back mode as the lever is now fxee to move. Interconnecting means is efEective for moving the cam 51 ~a) into the first condition when the housing 17 is in the standby mode whereat .
the latch member plate 33 responsive ko the movement of the slide member.40 caused by manipulation of the lever 48, via the cam, releases the lid 11, and (b) into the second condition~when the housing i.s in the playback mode whereat manipulation of the release lever is ineffective to release the lid, i~f the lid were closed.
~ ~ ' .
. - 12 -' ~ ~ ` . . .. .
~, ~
1076255 RCA 68,900 1 provided. Means interconnecting the operative means and a signal pickup housing of the player is effective for aisposing the operative means into the first condition when the housing is in a playback mode whereat manipulation of the release lever is ineffective to release the lid, and into the second condition when the housing is in a standby mode whereat the latch member responsive to manipulation of the lever releases the lid, if the lid were closed.
Pursuant to a further feature of the invention, a turntable brake mechanism is provided for braking the turntable when the lid is opened while the turntable is rotating.
.' :
Objects, features, and advantages of the present invention will be more fully understood from the following detailed description of the preferred embod~ment, t~e appended c1a1ms, and the accompanying drawings in whic~:
FIGURE l is a plan view of a video disc player incorporating an illustrati.ve embodiment of a lid interlock apparatus according to the present invention, the lid of the player is shown in an open position for clarity;
FIGURE 2 is a side view of the video disc player o~ FIGURE l FIGURE 3 is a partially cut-away, perspective : :.
view of the~lid interlock apparatus suitable for use with the player of FIGURES l and 2; ~ ;;
FIGURE 4 is a front view of a portion of the lid interlock apparatus of FIGURE 3;
FIGURE 5 is a partially cut-away, sectioned side : . ~.. ,.. :, ' RCA 68, 900 :~76~S5 1 view of the lid interlock apparatus along the line X-X in FIGURE 4i FI~URE 6 diagrammatically'illustrates a turntable brake mechanism suitable for use with the lid interlock apparatus of FIGURES 3, 4, and 5; and FIGURE 7 iS a partially cut-away, perspective view of a modified lid interlock apparatus according to another embodiment of the present invention.
.,~
~Referring to the drawings, wherein like reference ,~' numerals designate similar elements in the various views, in FIGURES l and 2 a video disc player is~shown having a base lO. A lid ll is pivoted to the base lO for movement between a closed position and an open position. The player is suitable for use in a video disc system such as disclosed in the aforementioned Clemens patent. A turntable 12 is rotatably mounted on the base lO. The upper surface of the turntable 12 is adapted to support a video disc record 13.
Video informat1on is recorded by means of geometrical variations 1n;the bottom of a smooth spiral groove 14 on the substrate Oe the disc record 13. The disc record 13 sur~ace includes a conductive coatiny which is preferably covered ', with a thin deposit of dielectric material. A signal pickup .. , ~ .
15, supported at one end of a conductive pickup arm 16, engages the spiral groove 14 and includes a conductive electrode (not shownj which, ~,ogèther with the conductive coating and the dieleatr1c deposit, form a capacitor. When relative motion is established between the signal pickup 15 ~ , .
and the disc record 13j an edge of the electrode included , in the signal pickupj~ while riding in the~spiral groove 14, ., :
RCA 68 ,900 ~76~55 1 serves as an electrode of a capacitor varying due to the geometric variations in the bottom of a smooth spiral groove passing beneath. The other end oE the plckup ~rm 16 is flexibly supported by a pickup arm support carried by a signal pickup housing 17.
As indicated before, a radial feed drive mechanism 18 traverses the pickup arm support mounted in signal pickup housing 17~in proper time relationship with the radial motion of the slgnal pickup 15 tip engaged in the spiral groove 14 so as to continuously maintain the longitudinal axis of the pickup arm substantially tangential to the spiral groove at th~ point of engagement. A slot 28 is provided in the base 10 for accommodating the radial motion of the housing 17. Reference may be made to the afore-menti.oned Stave patent (U.S. Patent No. 3,870,835) for an illustration of a suitable feed drive mechanism for providing the indicated radial motion.
During playback, the pickup arm 16 passes through an opening 19 in the bottom wall of the housing to allow the signal pickup L5 to ride in the spiral groove 14. A ;
pivotally mounted bracket 20 lifts the free end of the pickup arm 16 to disengage the siynal pickup 15 from the spiral groove 14 when the player is inoperativeO
A plurality of push buttons 21, 22, 23, 24, 2S 25, and 26 are provided along the front panel 27 for, respectively, effecting the following functions: start, . . . .
pause, rejèct, fast forward, reverse, and lid release. ;~
A lip 29 lS fastened to the lid 11 for entry into an opening 30 provided in the base 10 in order to engage a ~
30~ latch member of a lid interlock apparatus 31 to be described ;
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RCA 68,900 1 subsequently. A plunger/of a turntable brake mechanism 32 is reciprocably mounted in the base lO for cooperation with the lid ll in the manner also to be described subsequently.
Reference will now be made to FIGURES 3, 4, and 5.
FIGURE 3 is a partially cut-away, perspective view of the lid interlock apparatus 31. FIGURES 4 and 5 are, respec-tively, th front view and a partially sectioned side view of a portion of the lid interlock apparatus of FIGURE 3.
A latch member comprises a plate 33 pivotally mounted on the base lO for movement between (l) a protruding position, and (2) a retracted position. A first tab 34 is secured to the plate 33 for (a) engagement with an aperture 35 provided in the lip ~9 of the lid ll when the plate 33 is in the protruding position, and (b) releasing the lip when the plate is in retracted position, if the lid is closed. A wire spring 36 is inserted into an opening ., 37 provided in a tab 38 fastened to the plate 33 in a manner that biases the plate in the protruding position.
The first tab 34 has a slanting top surface in order to facilitate gradual shi~ting of the plate 33 to the retracted position by the lip 29 as the lip is inserted into the :
. ., opening 30 provided in the base lO. The wire spring 36 pushes the first tab 34 into the aperture 35 disposed in the lip 29 thereby securely holding the lid 1l to the base lO. A second tab 39 is secured to the plate 33 ~or engagement~with one end of a slide member 40 reciprocably mounted to a bracket 41 attached to the base~lO. Elongated slots 42 and 43 are provided in the slide 40 for cooperation with pins 44 and 45 fastened to the bracket 41 thereby permitting reciprocating movement of the slide with respect ' ,; :
' RCA 68,900 ~1:176255 1 to the bracket. The second tab 39 has a slanting bottom surface in order to facilitate gradual movement of the plate 33 against the sprlng 36 to the retracted position by the one end of the slide 40 as the slide ls pushed upward.
The slid'e 40 has a neck portion 46 at the second end forming a shoulder portion 47 at the second end of the slide. A lid release lever 48, carrying the push button 26, is pivotally mounted on a frame 49 attached to the base l0.
An open-ended slot 50 is pro~ided at one end of the lid release lever 48 for freely receiving the~neck portion 46 of the slide 40. When the push button 26 is depressed, the lid release lever 48 engages the shoulder portion ~7 of the sl'ide pushing the slide upward. The upward mot~on of the slide causes the plate 33 to retract thereb~
releasing the lid ll, if the lid were closed. Means are '; ;
provided for biasing the lid ll in the open position and ~' the push button 26 in an elevated position.
A cam 51 is pivotally mounted on the bracket 41 . , .
by a pin 52 attached to the bracket on the side opposite of the slide 40. A retainer 52' positions the cam 51 on the ,, pin 52. The cam Sl is movable between (l) a'first condition `"i"' ""' decoupling, and (2) a second condition intercoupling, the release lever 48 and the latch member plate 33. Orientation of tho cam 51 in the first condition renders the lid ~5 release lever 48 immovable because a tounge portion 53 ~
of the cam~blocks the manipulation of the lever. Orientation ~; ', of the cam'5L in the second condition (as illustrated in ' , FIGURES 3j 4, and 5) fre~s the manipulation'of the lever 48. -,~
.. : :
Means 54 are provided for interconnecting the cam 51 and the housing 17. The radial feed drive 18 drives _ g _ ' ~ , .
RCA 68,90n 1~76Z55 1 the housing 17 between a standby mode and the playback mode.
The interconnecting means 54 is eEfective for moving the cam 51 (a~ into the first condition when the housing 17 is in the playback mode whereat manipulation of the release lever 48 is ineffective to release the lid 11, and (b) into the second condition when the housing is in the off the record disc standby mode (such as shown in FIGURE 1) whereat the latch member responsive to manipulation of the lever releases the lid, if the lid were closed.
Illustratively, the interconnecting means 54 comprises a first hub 55 pivotally mounted in the base 10.
A pin 56 is secured to the hub 55 for engagement with a downwardly depending tab 57 coupled to the housing 17.
When the housing 17 moves from the playback mode to the standby mode, the tab 57 engages the pin 56 and rotates the hub 55 in clockwise direction when viewed from the ;:
top. A second hub 58 is mounted in the base for rotation with the~.first hub 55. A pin 59 is secured to the second hub 58. A cord 60 interconnects the cam 51 and the pin 59 attached to the hub 58. A pulley 61 is mounted on a bracket attached to the frame 49 of the base 10. The pulley 61 guides the cord 60 such that clockwise rotation of the hubs (55 and 58), as the housing 17 moves from the playback mode to the standby mode, causes the cam 51 to move to the second condition, thereby freeing the lid release .
lever 48 to operate the latch member for releasing the ~ :
lid 11.
A wire spring 62 is provided for biasing the cam in the first condition, whereby when the housing 17 is in the playback mode manipulation of the lid release lever 48 is ineffective to release the lid 11.
1076Z55 RCA 68,900 1 A safety spring 63 may be inserted in the cord 60 to prevent damage in the event of mechanical failure, such as jamming.
An opening 64 is provided in the base lO, as shown in FIGURE 5j for the purpose of releasing the lid ll by pushing the,slide 40 upward, irrespective of the position of the cam Sl. 32 The turntable bxake mechanism/w1ll now be explained by reference to FIGURE 6. A plunger 65 is reciprocably mounted in the base lO for movement between (l) a first position when the lid ll is released open, and (2) a second ;' position when the lid is closed, in response to the lid movement. A spring 66 is inserted between a retainer 70, attached to the plunger 65, and the base lO~for biasing the plunger in the first position. A frict~on pad 67 ~s ~, secured to the other end of a bracket 68 attached to t~e plunger 65(for engagement with the underside of the turn~
table 12 when the plunger is in the first position effecting braking o$'the turntable when the lid ll is opened while the turntable is rotating. A slot 69 is cut into the base lO for permitting reciprocal motion of the bracket 68.
The movement of the plunger 65, when the lid ll : : -is opened,,may be advantageously utilized to cut off power ,;
to the turntable drive motion (not shown), thereby further , . :
reducing the safety hazard. ' Thus, the described lid interlock a~arat1~ maY be . . .
used to (l) prevent opening of the lid during playback, or ~2) brake thè turntable when the lid is opened while the turntable is rotating at a relatively high speed or both. '' '' ~ ~FIGURE 7 is a partially cut-away, perspective ..", . . .
. .
. . i .- : : . . .: : . :
RCA 68 ,900 ~a~7~;~Z~iS
1 view of a modified interloc]c apparatus according to another embodiment of the present invention. In the FIGURE 7 embodiment the cam 51 is mounted on the reciprocating slide 40 instead of on the fixed bracket 41. The cam 51 ls positionable between (1) a first condition intercoupling, and (2) a second condition decoupling (as illustrated in FIGURE 7), the release lever 48 and the slide 40. When the cam 51 is in the second condition, the latch member structure does not obstruct movement of the lever 48 as the shoulder portions 47 of the slide 40 do not engage the lever through-out the range of movement of khe lever (in contradistinction to arrangement of FIGURES 3, 4, and 5). The reason for the FIGURE 7~arrangement is that it protects the lid inter-lock apparatus from damage in the event of accidental pushing of the lever 48 when the housing 17 is in the play-back mode as the lever is now fxee to move. Interconnecting means is efEective for moving the cam 51 ~a) into the first condition when the housing 17 is in the standby mode whereat .
the latch member plate 33 responsive ko the movement of the slide member.40 caused by manipulation of the lever 48, via the cam, releases the lid 11, and (b) into the second condition~when the housing i.s in the playback mode whereat manipulation of the release lever is ineffective to release the lid, i~f the lid were closed.
~ ~ ' .
. - 12 -' ~ ~ ` . . .. .
Claims (7)
1. In a playback system for recovering prerecorded signals by a signal pickup from a disc record rotatably mounted on a turntable, the playback system including a lid pivoted on a base for movement between a closed position and an open position, and a signal pickup housing reciprocably mounted on the base for travel between a standby mode and a playback mode, a lid interlock apparatus comprising: a movably mounted lid release member; lid latch means selectively responsive to manipulation of the release member for releasably securing the lid; means operative in a first condition decoupling the release member and the lid latch and operative in a second condition intercoupling the release member and the lid latch; and means interconnecting the operative means and the signal pickup housing, with the interconnecting means being effective in response to the position of the housing for disposing the operative means into the first condition when the housing is in the playback mode wherein manipulation of the release lever is ineffective to release the lid, and into the second condition when the housing is in the standby mode wherein the latch member responsive to manipulation of the lever releases the lid, if the lid were in the closed position.
RCA 68,900
RCA 68,900
2. A system as defined in Claim 1 wherein said operative means comprises a cam movably mounted on the base, and wherein the lid latch means comprises:
a plate pivotally mounted on the base for move-ment between a protruding position, and a retracted position; a first tab secured to the plate for engage-ment with a lip provided in the lid when the plate is in the protruding position, and releasing the lip when the plate is in the retracted position, if the lid were closed; a second tab secured to the plate for engagement with one end of a slide member reciprocably mounted on the base, the second end of the slide member being subject to engagement with the release member, and means for biasing the plate in the protruding position.
a plate pivotally mounted on the base for move-ment between a protruding position, and a retracted position; a first tab secured to the plate for engage-ment with a lip provided in the lid when the plate is in the protruding position, and releasing the lip when the plate is in the retracted position, if the lid were closed; a second tab secured to the plate for engagement with one end of a slide member reciprocably mounted on the base, the second end of the slide member being subject to engagement with the release member, and means for biasing the plate in the protruding position.
3. A system as defined in Claim 2 wherein the cam blocks the manipulation of the lid release member when it is in the first condition, and frees the manipulation of the member when it is in the second condition.
4. A system as defined in Claim 3 further including means for biasing the cam in the first condition, whereby when the housing is in the playback mode manipulation of the lever is ineffective to release the lid.
RCA 68, 900 5. In a playback system for recovering pre-recorded signals by a signal pickup from a disc record rotatably mounted on a turntable, the playback system including a lid pivoted on a base for movement between a closed position and a released position, and a signal pickup housing reciprocably mounted on the base for travel between a standby mode and a playback mode, a lid interlock apparatus comprising:
a lid release lever movably mounted on the base;
a lid latch member for selectively releasing the lid in response to manipulation of the release lever, the latch member comprising: a plate pivotally mounted on the base for movement between a protruding position, and a retracted position; a first tab secured to the plate for: engagement with the lip provided in the lid when the plate is in the protruding position, and releasing the lip when the plate is in the retracted position, if the lid were closed; a second tab secured to the plate for engagement with one end of a slide member reciprocably mounted on the base, and means for biasing the plate in the protruding position;
a cam mounted on the slide member for movement between a first condition intercoupling, and a second condition decoupling, the release lever and the slide; and wherein when the cam is in the second condition the latch member structure does not obstruct movement of the release lever; and means interconnecting the cam and the signal pickup housing, wherein the interconnecting means is RCA 68,900
RCA 68, 900 5. In a playback system for recovering pre-recorded signals by a signal pickup from a disc record rotatably mounted on a turntable, the playback system including a lid pivoted on a base for movement between a closed position and a released position, and a signal pickup housing reciprocably mounted on the base for travel between a standby mode and a playback mode, a lid interlock apparatus comprising:
a lid release lever movably mounted on the base;
a lid latch member for selectively releasing the lid in response to manipulation of the release lever, the latch member comprising: a plate pivotally mounted on the base for movement between a protruding position, and a retracted position; a first tab secured to the plate for: engagement with the lip provided in the lid when the plate is in the protruding position, and releasing the lip when the plate is in the retracted position, if the lid were closed; a second tab secured to the plate for engagement with one end of a slide member reciprocably mounted on the base, and means for biasing the plate in the protruding position;
a cam mounted on the slide member for movement between a first condition intercoupling, and a second condition decoupling, the release lever and the slide; and wherein when the cam is in the second condition the latch member structure does not obstruct movement of the release lever; and means interconnecting the cam and the signal pickup housing, wherein the interconnecting means is RCA 68,900
CLAIM 5 CONTINUED
effective for moving the cam into the first condition when the housing is in the standby mode whereat the latch member plate responsive to the movement of the slide member caused by manipulation of the lever releases the lid, and for moving the cam into the second condition when the housing is in the playback mode whereat manipulation of the release lever is ineffective to release the lid, if the lid were closed.
Canada
effective for moving the cam into the first condition when the housing is in the standby mode whereat the latch member plate responsive to the movement of the slide member caused by manipulation of the lever releases the lid, and for moving the cam into the second condition when the housing is in the playback mode whereat manipulation of the release lever is ineffective to release the lid, if the lid were closed.
Canada
6. A system as defined in Claim 1, 2 or 5 wherein the interconnecting means comprises: a hub pivotally mounted in the base; a pin secured to the hub and subject to engagement with the housing as the housing travels from the playback mode to the standby mode thereby rotating the hub; a cord inter-connecting the cam and the hub; and guide means mounted on the base for guiding the cord such that rotation of the hub causes the cam to move to the second condition.
7. A system as defined in Claim 1 or 5 further including a turntable brake mechanism comprising: a plunger reciprocably mounted in the base for movement between a first position when the lid is released open, and a second position when the lid is closed, in response to the lid movement; means for biasing the plunger in the first position; and a friction pad secured to one end of the plunger for engagement with the turntable when the plunger is in the first position thereby effecting braking of the turntable when the lid is opened while the turntable is rotating.
April 19, 1979
April 19, 1979
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB49927/74A GB1525696A (en) | 1974-11-18 | 1974-11-18 | Lid interlock system |
| US05/545,406 US3940148A (en) | 1974-11-18 | 1975-01-30 | Lid interlock apparatus for a disc record player |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1076255A true CA1076255A (en) | 1980-04-22 |
Family
ID=26266563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA237,828A Expired CA1076255A (en) | 1974-11-18 | 1975-10-16 | Lid interlock and turntable brake system |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5531547B2 (en) |
| CA (1) | CA1076255A (en) |
| DE (1) | DE2551796A1 (en) |
| FR (1) | FR2291574A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL173696C (en) * | 1975-09-11 | 1984-02-16 | Philips Nv | OPTICAL RECORD PLAYER. |
| NL7701332A (en) * | 1977-02-09 | 1978-08-11 | Philips Nv | VIDEO RECORD PLAYER. |
| JPS5271204A (en) * | 1976-02-10 | 1977-06-14 | Victor Co Of Japan Ltd | Playback device of disc form signal recording media |
| JPS5830241Y2 (en) * | 1976-12-20 | 1983-07-04 | ティアック株式会社 | Disc recording or playback device |
| NL182609C (en) * | 1977-02-10 | 1988-04-05 | Philips Nv | VIDEO RECORD PLAYER. |
| JPS5414506U (en) * | 1977-07-01 | 1979-01-30 | ||
| JPS5459116A (en) * | 1977-10-19 | 1979-05-12 | Toshiba Corp | Flexible disc driving apparatus |
| US4326284A (en) * | 1980-05-09 | 1982-04-20 | Rca Corporation | Video disc player having turntable assist apparatus |
| JPS5737771A (en) * | 1980-08-18 | 1982-03-02 | Victor Co Of Japan Ltd | Case opening device |
| JPS5956694U (en) * | 1982-10-05 | 1984-04-13 | 日本コロムビア株式会社 | Loading lid opening/closing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2148806A5 (en) * | 1971-08-04 | 1973-03-23 | Honeywell Bull Soc Ind | |
| JPS5126665Y2 (en) * | 1972-08-30 | 1976-07-07 |
-
1975
- 1975-10-16 CA CA237,828A patent/CA1076255A/en not_active Expired
- 1975-11-13 JP JP13711675A patent/JPS5531547B2/ja not_active Expired
- 1975-11-17 FR FR7535049A patent/FR2291574A1/en active Granted
- 1975-11-18 DE DE19752551796 patent/DE2551796A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| FR2291574B3 (en) | 1978-08-18 |
| JPS5531547B2 (en) | 1980-08-19 |
| JPS5172404A (en) | 1976-06-23 |
| DE2551796A1 (en) | 1976-05-26 |
| FR2291574A1 (en) | 1976-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |