April 26, 1966
`
`Filed Oct. 28, 1963
`11
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`I
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`FM!
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`117
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`R. A. WOLF ETAL
`TUNER DEVICE
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`3,247,728
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`2 Sheets-Sheet l
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`AM
`LRFYAMP
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`28
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`‘__€ 25
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`POWER
`SUPPLY ~27
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`AUDIO
`AMP 3
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`23
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`36
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`33
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`£21
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`v INVENTORS
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`TCL EXHIBIT 1020
`Page 1 of 5
`
`

`
`April 26, 1966
`
`R. A. WOLF ETAL
`
`3,247,728
`
`TUNER DEVICE
`
`Filed Oct. 28, 1963
`
`2 Sheets-Sheet 2
`
`39
`50w
`mg]??? I
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`INVENTORS
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`
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`jy?azg @5126‘; an 5/0/15
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`¢ M0 I
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`TCL EXHIBIT 1020
`Page 2 of 5
`
`

`
`United States Patent ()? ice
`
`3,247,723
`Patented Apr. 26, 1966
`
`1
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`3,247,728
`-
`TUNER DEVICE
`Robert A. Wolf, {Fair Lawn, and Alfred J. Ciarlr,
`Palatine, lill., assignors to Motorola, Inc, Franklin
`Park, Hit, a corporation of Illinois
`Filed Get. 28, 1963, Ser. No. 319,256
`5 Claims. (Cl. 74-1033)
`
`15
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`50
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`2
`In accordancewith the invention, a tuning device for a
`combination AM-FM radio receiver includes a plurality
`of linearly displaceable pushbutton cam slides. Each of
`the cam slides carries a presettable cam which is en
`gageable with a pair of treadle bars to align the same
`according to the setting of the cam. The treadle bars
`are linked through a carriage mechanism to tuning slugs
`for both the AM and FM portions of the receiver and ac
`cordingly, the position of the treadle bars governs the
`‘frequency to which-the receiver is tuned for both AM
`and PM reception. Each cam slide is operable by a
`p-ushbutton which is accessible from outside of the re
`ceiver. A selector switch is provided for switching the
`receiver between AM and FM reception and is actuable
`by an actuating member which is linearly displaceable
`transversely of the cam slides. The actuating member
`is provided with a plurality of obliquely disposed cam
`surfaces thereon which are engageable to displace the
`actuating member ‘for switching the receiver to AM or FM
`reception. Each pushb-utton is provided with a switch
`able arm thereon which carries a cam pin engageable with
`respective ones of the cam surfaces on the actuating mem
`ber [according to the setting of the lever to switch the re
`ceiver to AM or FM reception when the pushbutton is
`depressed.
`In one form of the invention, the cam surfaces on the
`actuating member. are formed by a plurality of V-shaped
`projections on the‘ actuating member respectively aligned
`. with the pushbuttons.
`In another form of the invention
`30
`the oblique cam surfaces are formed by a plurality of
`V-shaped notches in the actuating member respectively
`aligned with the pushbuttons. By utilizing the presettable
`cam on the cam slide in combination with an appropriate
`setting of the switchable arm on the underside of the par
`ticular pushbutton associated with the cam slide, each ‘
`pushbutton may be set to tune the receiver to a pre
`determined frequency for either AM or ‘FM reception.
`Referring now to FIG. 1, a combination AM~FM re
`ceiver of the type in which the invention may be in
`corporated is shown schematically. With the receiver
`operating in PM mode, signals ‘from antenna 11 are
`applied to radio frequency ampli?er 12 and are then
`heterodyned against signals from local oscillator 13 in
`mixer 14. The intermediate frequency signals from
`mixer 14 are applied to a ?rst intermediate frequency
`amplifier 15 and are then coupled to a second inter
`mediate frequency ampli?er 16 through FM tuned circuit
`17. A further PM tuned circuit 18 couples intermediate
`frequency ampli?er 16 to a ?nal intermediate frequency
`ampli?er 19. Tuned circuit 20 couples the output of in
`termediate frequency ampli?er 19 to limiter and dis—
`criminator stages 21 which provide audio signals applied
`through switch 26 to the audio ampli?er 22 and speaker
`23.
`When operating in AM mode, switches 24, 25 and 26
`are moved from the positions shown in FIG. 1 to the AM
`positions. Switch 24 will therefore disconnect power
`power supply 27 from the FM radio frequency ampli?er
`and mixer and local oscillator and connect it to the AM
`radio frequency ampli?er 28. Signals from antenna 11
`are thereby ampli?ed by ampli?er 28 and applied to the
`AM mixer stage 15 which also serves as the ?rst inter
`mediate frequency ampli?er for the FM mode of opera
`tion. Signals from AM local oscillator 29 are hetero~
`dyned against signals frorn'radio frequency ampli?er 218
`in mixer 15 and are coupled through AM tuner circuit
`17 to intermediate frequency ampli?er 16. AM tuned
`circuit 18 couples ampli?er 16 to ampli?er 19, the output
`of which‘is applied to AM. detector 30. Switch 26 then
`couples the output of AM detector 30 to the audio am
`pli?er ‘22 ‘and from there to speaker 23‘. Switches 24,
`
`This invention relates to tuning apparatus for a com
`bination AM-FM radio receiver, and more particularly
`to pushbutton tuning apparatus wherein each pushbutton
`assembly may be preprogramed to select a frequency for
`either AM or FM reception.
`Combination AM~FM radio receivers mounted in au
`tomobiles are rapidly gaining popularity. Pushbutton
`tuning of automobile radios has always been a signi?cant
`feature because of the convenience and minimization of
`distraction it affords to the driver. It would be possible
`in ‘a combination AM-F-M radio to provide a separate
`group of pushbuttons for FM tuning in addition to the
`usual number provided for AM tuning. Such a large
`number of buttons, however, gives the dash panel of the
`automobile a cluttered appearance. If the number of
`buttons provided for the combination AMJFM radio is
`limited to the ?ve or so buttons now used for conventional
`AM receivers, versatility may be curtailed unless any one
`of the buttons may be preproigramed by the user to pre
`select either an AM or an FM station.
`Heretofore, certain attempts at developing tuning ap
`paratus for combination AM-FM radios, which apparatus
`contained push-buttons capable of being preprogramed by
`the user to preselect either AM or FM stations, have
`involved complex structures and elaborate switching sys
`tems. Often the result of such complexity and elaborate
`ness was to render the tuning unreliable and difficult to
`operate.
`Accordingly, it is an object of this invention to provide ‘
`improved pushbutton tuning apparatus for a combination
`AM~FM receiver.
`Another object of the invention is to provide reliable,
`40
`low cost pushbutton tuning apparatus for an AM-FM
`radio receiver wherein any one of the pushbuttons may
`be preprogramed to select either an AM or an FM station.
`A feature of the invention is the provision, in a push
`button operable tuning mechanism for use in a combi
`nation AM-FM radio receiver, of a transversely movable
`member to actuate the AM or FM selector switch with
`a plurality of cam surfaces thereon engageable by ad
`justable cams on the pushbuttons.
`Another feature of the invention is the provision, in a
`tuning device, of a plurality .of linearly depressible push
`button assemblies, each ‘having a ?rst cam thereon for
`adjustably positioning a tuner carriage, and a second ad
`justable cam engageable with surfaces on a transversely
`movable AM~FM selector switch actuating member.
`Still another feature of the invention is the provision
`of a tuning device comprising a plurality of linearly
`depressible pushbutton assemblies, and of adjustable cams
`on the pushbuttons engageable with V-shaped projections
`in a transversely movable AM-FM selector switch actu
`ating member. The selector switch actuating member
`may alternately have V-shaped notches for engagement
`by the adjustable cams.
`In the drawing:
`FIG. 1 is a schematic diagram of a combination AM
`FM receiver in which the invention may be incorporated;
`FIG. 2 is a bottom plan view of a tuner mechanism
`constructed in accordance with the invention;
`FIG. 3 is a sectional view taken along the line 3-3
`of FIG. 2; and
`FIG. 4 is a perspective view illustrating a further em
`bodiment of the invention.
`
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`60
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`TCL EXHIBIT 1020
`Page 3 of 5
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`

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`3
`25 and 26 are ganged for simultaneous operation to
`switch the receiver from AM reception to FM reception,
`and vice versa.
`Referring now to FIGS. 2 and 3 there is shown a tun
`ing device for use in connection with the radio receiver
`illustrated in FIG. 1. The tuning device shown is of
`the preprogramed pushbutton selector type commonly
`in use on automobile radio receivers. A tuning control
`shaft 31, which may extend through the front of the
`dash panel in the automobile and be manually operable
`by a knob, is coupled through a pinch washer 3?. and
`disk 33 to drive pinion gear 34. Gear 34 engages drive
`gear 35 which is coupled through clutch 36 to tuner shaft
`37. Tuner shaft 3'7 drives treadl'e arms 38 which posi
`tion tuning carriage 39 to control the positioning of tun
`ing slugs 4% in tuning coils 40. Certain of the coils 46
`control the tuning for AM operation of the receiver and
`other of the coils 40 control the tuning for PM opera
`tion. As a result, control shaft 31 may be turned to
`tune the receiver when operating in either AM or FM
`mode.
`The receiver may also be tuned by a plurality of push
`buttons 41 which extend from the front of the receiver
`through the dash panel of the automobile. Each push
`button controls a respective slide member 42 which car
`ries a presettable cam 42a for engaging a pair of treadle
`‘bars 43.
`Treadle bars 43 are connected to treadle arms
`38 which operate the tuning carriage 39. Accordingly,
`the positioning of the various cams on the slide members
`42 will align treadle bars 43 in a preset position and
`tune coils 40 to a given frequency.
`Cam slides 42 each have a portion 44 engageable
`with a clutch actuating .lever 45. Upon the depression
`of a bushbutton 41 and corresponding cam slide 42, cam
`actuating lever 45' will be pivoted in the direction of the
`arrow in FIG. 3 to cause cam 46 to pivot a lever 47.
`Lever 47 is connected to disengage clutch 36 when
`pivoted and decouple the tuning shaft 31 from the car
`riage assembly. The operation of the tuner thus far de
`scribed is similar to that of the AM tuner shown in the
`Patent No. 2,793,531 issued to R. E. Thompson, and
`assigned to the assignee of the present invention.
`Ganged switches 24, 25 and 26 are actuable by switch
`button 51. Button 51 in turn is actuable by movement
`of an actuator plate 52. A handle 53 may extend from
`plate 52 outwardly of the receiver and may be manually
`moved to selectively move plate 52 in the direction desig
`nated by the arrow in FIG. 2 to thereby operate the re
`ceiver from AM to PM modes and vice versa.
`In addition to the manual switching provision, the
`tuner of the invention is also automatically switched be
`tween the two modes according to the pre-programming
`of the various pushbutton slide assemblies. Each of
`pushbuttons 41 carries on the underside thereof a pivotal
`lever 55. Each of levers 55 are held to their respective
`55
`pushbuttons by a screw 57 and spring washer 5%. A
`small projection 59 on lever 55 engages the outside of the
`center slide receiving portion 61 of pushbutton 41 to ren
`der the lever bistable between two positions. The lever
`may be switched between the two positions by applying
`suflicient manual pressure to the projections 63 to cause
`projection 59 to ride over the center portion 61 against
`the bias of spring washer 58.
`Each of levers 55 carries a cam pin 64 on the end
`thereof. Plate 52 is provided with a plurality of V-shaped
`projections 65 in alignment with respective ones of push
`buttons 41. Projections 65 form a pair of oblique sur
`faces and since the movement of plate 52 is transverse
`to the movement of cam slides 42, engagement of these
`surfaces will move the slide between AM and FM posi
`tions. For example, slide 52 is shown in FIG. 2 in the
`FM position, and depression of either of the three mid
`dle pushbuttons 41 will cause the pins 64 on the levers
`associated therewith to engage the appropriate surface
`of projection 65 to move the slide 52. to the AM posi
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`tion. If the cam slides are pre-programmed for a par
`ticular AM frequency, depression of that pushbutton
`will automatically switch the tuner to the AM mode of
`reception while at the same time tuning it to the AM
`requency. Similarly, a pushbutton wherein the asso
`ciated lever 55 is positioned in the FM position will re
`turn the slide to the PM position for FM reception. Each
`pushbutton slide assembly may therefore be pre-pro
`grammed to a particular frequency for either AM or FM
`reception, and the lever 55 associated therewith moved
`to an appropriate position to switch to the particular mode
`of operation desired. Upon depression of the pushbut
`ton, the tuner will then automatically select the band and
`the frequency in the band. Any combination of AM and
`PM frequencies, or all AM or all FM frequencies may be
`preprogrammed on the tuner of the invention in a sim
`ple operation performed by the user of the receiver.
`Referring now to FIG. 4, a variation in the form of
`slide 52 may be seen. The slide 52a of FIG. 4 is pro
`vided with a V-notch 65a therein which constitutes the
`appropriate camming surfaces for moving the slide'SZa
`to PM or AM positions. The assembly of the push
`button, including lever 55, is identical with that shown
`in FIGS. 2 and 3.
`it may therefore be seen that the invention provides
`an improved pushbutton tuning device for a combina
`tion AM-FM receiver which is reliable and low in cost,
`and wherein any of the pushbuttons may be prepro
`grammed to select either AM or FM station-s.
`We claim:
`1. A tuning mechanism for use in a combination FM—
`AM radio receiver, including in combination, a selector
`switch actuable to PM and AM positions for FM and
`AM modes of reception respectively, a plurality of push
`button cam slide assemblies each comprising a presettable
`cam slide linearly displaceable to tune the receiver to
`given frequencies for FM and AM reception and a man
`ualiy depressible pushbutton ?xed to said slide and acces
`sible from outside of the receiver for linearly displac
`ing said slide, a selector switch actuating member linear
`ly displaceable transversely to the displacement of said
`cam slides and having a plurality of oblique cam surfaces
`thereon engageable to displace said actuating member to
`selectively actuate said selector switch to PM and AM
`positions, and a cam on the underside of each of said
`pushbuttons, each of said cams being manually switch
`able to selectively engage an appropriate one of said
`cam surfaces on said actuating member to actuate said
`selector switch to PM and AM positions, whereby each
`of said pushbutton cam slide assemblies may be selec
`tively preset for tuning the receiver to a given frequency
`and a given mode of reception.
`2. A tuning mechanism for use in a combination FM
`AM radio receiver, including in combination, a selector
`switch actuable to PM and AM positions for PM and
`AM modes of reception respectively, a plurality of push
`button cam slide assemblies, each comprising a presettable
`cam slide linearly displaceable to tune the receiver to
`given frequencies for FM and AM reception and further
`comprising a manually depressible pushbutton ?xed to
`said slide and accessible from outside of the receiver
`for linearly displacing said slide, a selector switch ac
`tuating member linearly displaceable transversely to the
`displacement of said cam slides, said selector switch ac
`tuating member having a plurality of ?rst oblique cam
`surfaces thereon and a plurality of second oblique sur
`faces thereon aligned in pairs with respective ones of said
`pushbuttons, said ?rst cam surfaces being disposed to
`be engageable to displace said actuating member to ac
`tuate said selector switch to PM position and said second
`cam surfaces being disposed to be engageable to displace
`said actuating member to actuate said selector switch to
`AM position, and a cam on the underside of each of said
`pushbuttons, each of said cams being manually switch
`able to selectively engage an appropriate one of said
`
`TCL EXHIBIT 1020
`Page 4 of 5
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`

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`3,247,728
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`10
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`15
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`20
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`5
`?rst and second cam surfaces on said actuating member
`to actuate said selector switch to PM and AM positions,
`whereby each of said pushbutton cam slide assemblies
`may be selectively preset for tuning the receiver to a
`given frequency and a given mode of reception.
`3. A tuning mechanism for use in a combination
`FM~AM radio receiver, including in combination, a se—
`lector switch actuable to PM and AM positions for FM
`and AM modes of reception respectively, a plurality of
`pushbutton cam slide assemblies each comprising a pre
`settable cam slide linearly displaceable to tune the re
`ceiver to given frequencies for FM and AM reception
`and ‘further comprising a manually depressible pushbut
`ton ?xed to said slide and accessible from the outside of
`the receiver for linearly displacing said slide, a selector
`switch actuating member linearly displaceable transverse
`ly to the displacement of said cam slides, said selector
`switch actuating member having a plurality of ?rst oblique
`cam surfaces thereon and a plurality of second oblique
`cam surfaces thereon aligned in pairs with respective ones
`of said pushbuttons, said ?rstcam surfaces being disposed
`to be engageable to displace said actuating member to
`actuate said selector switch to PM position and said sec
`ond cam surfaces being disposed to be engageable to dis
`place‘said actuating member to actuate said selector
`' switch to AM position, and a bi-stable lever on the under
`side of each of said pushbuttons, each of said levers hav
`ing a cam pin extending therefrom and being manually
`switchable between ?rst and second positions to selective
`ly engage one of said ?rst and second cam surfaces re
`spectively upon depression of its associated pushbutton
`to actuate ‘said selector switch to PM and AM positions,
`whereby each of said pushbutton cam slide assemblies
`may be selectively preset for tuning the receiver to a given
`frequency and a given mode of reception.
`4. A tuning mechanism for use in a combination
`FM-AM radio receiver, including in combination, a se
`lector switch actuatble to PM and AM positions for FM
`and AM modes of reception respectively, a plurality of
`pushbutton cam slide assemblies each comprising a pre
`settable cam slide linearly displaceable to tune the re
`ceiver to given frequencies for FM and AM reception and
`further comprising a manually depressible pushbutton
`?xed to said slide and accessible from outside the re
`ceiver for linearly displacing said slide, a selector switch
`actuating member linearly displaceable transversely to
`the displacement of said cam slides and having a plu
`
`6
`rality of projections extending therefrom, each of said
`projections being in alignment with a respective one of
`said pushbuttons and having a pair of cam surfaces there
`on forming a V-shaped point, said cam surfaces being en
`gagea-ble to displace said actuating member to selectively
`actuate said selector switch to PM and AM positions,
`and a cam on the underside of each of said pushbuttons,
`each of said cams being manually switchable to selectively
`engage an appropriate one of said cam surfaces on said
`projections aligned therewith upon depression of its as
`sociated pushbutton to ‘actuate said selector switch to PM
`and AM positions, whereby each of said pushbutton cam
`slides assemblies may be selectively preset for tuning the
`receiver to a given frequency and a given mode of recep
`tion.
`5. A tuning mechanism for use in a combination
`.FM-AM radio receiver, including in combination, a se
`lector switch actua'ble to PM and AM positions for FM
`and AM modes of reception respectively, a plurality of
`pushbutton cam slide assemblies each comprising a pre
`settable cam slide linearly displaceable to tune the re
`ceiver to given frequencies for FM and AM reception
`and further comprising a manually depressible pushbutj
`ton ?xed to said slide and accessible from outside of the
`receiver for linearly displacing said slide, a selector switch
`actuating member linearly displaceable transversely to
`the displacement of said cam slides, said actuating mem
`her having a plurality of V-shaped notches therein aligned
`with respective ones of said pushbuttons, said notches
`having oblique cam surfaces therein engageable to dis~
`place said actuating member to selectively actuate said
`selector switch to PM and AM positions, and a cam on
`the underside of each of said pushbuttons, each of said
`cams being manually switchable to selectively engage an
`appropriate one of said cam surfaces in said V-notch
`aligned therewith upon depression of its associated push
`button to actuate said selector switch to PM and AM
`positions, whereby each of said pushbutton cam slide as
`semblies may be selectively preset for tuning the receiver
`to a given frequency and a given mode of reception.
`
`30
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`35
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`45
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`References Cited by the Examiner
`UNITED STATES PATENTS
`8/1959 Teaf ____________ __ 74—10.33
`
`2,898,767
`
`MILTON KAUFMAN, Primary Examiner.
`
`TCL EXHIBIT 1020
`Page 5 of 5