US3740679A - Broadcast channel selecting mechanism having motor operated rotary member - Google Patents

Broadcast channel selecting mechanism having motor operated rotary member Download PDF

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Publication number
US3740679A
US3740679A US00202745A US3740679DA US3740679A US 3740679 A US3740679 A US 3740679A US 00202745 A US00202745 A US 00202745A US 3740679D A US3740679D A US 3740679DA US 3740679 A US3740679 A US 3740679A
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tuning
switch
broadcast channel
rotary
selecting mechanism
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US00202745A
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English (en)
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S Kimura
Y Aoki
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KAPARU KK
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KAPARU KK
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/14—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings operated by auxiliary power
    • H03J5/16—Settings determined by a number of separate positioning means actuated by hand
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0209—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, by selecting the corresponding analogue value between a set of non preset values

Definitions

  • ABSTRACT A broadcast channel selecting mechanism for allchannel tuning means, arranged so that, in order to make tuning circuits for the respective receivable channels as the circuit of the applied signals to a variable capacity element is switched by a changeovermeans, the
  • the present invention is concerned with a broadcast channel selecting mechanism of tuning means, and more particularly, it relates to a broadcast channel selecting mechanism for tuning means, which can effect the tuning-in to the respective broadcast channels of both the VHF and UHF bands by the use of the same tuning system and which permits the selectable channels to be pre-set in accordance with the location of the receiving site, wherever it may be.
  • the switching type tuning means for use in receiving telecasts of the UHF band, there are being practiced the following two types, one of which is the mechanical tuning type where the conventional variable condenser is operated by a detent mechanism to function eventially as a sort of switch, and the other is the electronic tuning type where the connection of a variable resistor is changed-over by a switching mechanism so that the applied voltage to a variable capacity diode is regulated.
  • the tuning means of this type is suitable for use as a switching type UHF tuning means.
  • the electronic tuning type tuning means there is known one having the arrangement comprising a plural number of changeover switches of dual shaft structure to be operative that the connection of each of these switches can be changed over to any of the LOW VHF band, the HIGH VHF band and the UHF band by the rotation of its outer shaft, and that as its inner shaft is rotated while being depressed, the control voltage is adjusted to have the tuning means pre-set to any selected channel from among the plural number of receivable broadcast channels in the particular band to which the connection of the switch has been changed over, so that at the time of receiving the broadcast, the switch button for the selected pre-set channel is depressed.
  • a tuning means of the aforesaid type is subjected to a limitation in the number of switches required for the pre-setting of channels. Accordingly, depending on the location of the broadcast receiving site, there may arise the inconvenience that the number of the actual broadcast channels exceeds that of the switches, resulting in the fact that certain broadcast channels cannot be pre-set on, for example, the television receiving set. In order to provide switches in a number covering all of the many broadcast channels, therefore, there is required a space which is large enough to do so. This fact gives rise to an inconvenience in case this tuning means is to be incorporated in a television receiving set. Also, it will be difficult to select a telecast by a remote control device.
  • a primary object of the present invention to provide a broadcast channel changeover mechanism of a tuning means for use mostly in all channel television receiving set, which can tune in by the same tuning system to the respective telecast channels of both the VHF and the UHF bands.
  • Another object of the present invention is to provide a channel changeover mechanism of the type described, which permits the selected channels to be reset as desired so that the receivable channels can be pre-set in accordance with the location of the broadcast receiving site, wherever it may be.
  • Still another object of the present invention is to provide a tuning means for use in all-channel television receiving set, which has a mechanism arranged so that the respective numbers of the channels are digitally expressed in accordance with the selection of channels.
  • FIG. 1 is a block diagram, showing the electric connections of an example of the tuning means of the present invention
  • FIG. 2 is a chart, showing the tuning voltage characteristics of an example of the tuning means of the present invention
  • FIG. 3 is a somewhat diagrammatic explanatory illustration, partly broken away and in section and exploded, of an example of the mechanism of the tuning means according to the present invention
  • FIG. 4 is a somewhat diagrammatic illustration taken along the line IV-IV in FIG. 3;
  • FIG. 5 is a somewhat diagrammatic illustration taken along the line V-V in FIG. 3;
  • FIG. 6a is a somewhat diagrammatic enlarged sectional view taken along the line VIVI in FIG. 3;
  • FIG. 6b is a somewhat diagrammatic enlarged view taken along the line VIP-VI in FIG. 3;
  • FIG. 7 is a somewhat diagrammatic explanatory illustration, showing the mechanism for setting and releasing channel pre-setting pins in an example of the tuning means of the present invention
  • FIG. 8 is a circuit diagram, showing the electric connections for the channel selecting operations of a tun ing means according to the present invention.
  • FIG. 9 is a somewhat diagrammatic illustration, showing another example of the mechanism for deriving the output signals of the selected channel in the tuning mechanism of the present invention.
  • FIG. 10 is a somewhat diagrammatic illustration, showing another example of the changeover mechanism of the tuning means of the present invention shown in FIG. 4.
  • FIG. 1 there is shown a block diagram showing the electric connections of the tuning means according to the present invention.
  • the portion enclosed by one-dot-chain line indicated by reference symbol X represents the arrangement of the contacts of switches which are changed. over by the tuning means according to the present invention.
  • this arrangement of contacts there are provided a band contact B, for the LOW VHF band, a band contact B for the HIGH VHF band, and channel contacts T T T for the respective channels with respect to the band contact B for the UHF band.
  • a movable contact strip 17 connects between these band contacts and the channel contacts.
  • the respective channel contacts are connected to their corresponding tuning circuits of the LOW VHF, the HIGH VHF and the UHF. More particularly, these channel contacts are connected to voltage-setting variable resistors not shown which are assigned for applying tuning voltages of the respective channels to the tuningvariable capacity diode not shown which are contained in the respective tuners. Holes P P P are formed in a disk 12 which will be described later, to set the positions of connection for the respective channels. Position-limiting pins N N N are disengageably received in the holes P P P respectively, and they are useful in limiting the stopping position of the mov able contact strip 17, and in selecting a channel.
  • the curves L L and L shown in FIG. 2 represent the tuning voltage characteristic curves of the variable capacity diodes respesctively contained in the LOW VHF tuner, the HIGH VHF tuner and the UHF tuner which are shown in FIG. 1.
  • FIG. 3 the supporting plates 1, 2 and 3 are combined integrally at a portion not shown.
  • a first pulley 5 is mounted on a rotary shaft 4a of the motor 4 rotatably supported by the supporting plates 1 and 2.
  • a second pulley 7 is rotatably mounted on the shaft 6.
  • the bottom face of this second pulley 7 is provided with a material, such as felt, to provide a frictional face 7a.
  • a belt 8 is applied between the first pulley 5 and the second pulley 7.
  • a third pulley 9 having a gear portion 90 formed integrally around a part of its circumference is fixed on the shaft 6.
  • the upper face of this third pulley 9 is in contact with the frictional face 7a of the second pulley 7.
  • a coil spring 10 urges the second pulley 7 towards the third pulley 9 into contact therewith.
  • a shaft 1 1 is rotatably supported by the supporting plates 2 and 3.
  • a channel selection disk 12 is mounted on this shaft 11.
  • elastic belt 13 is applied to the annular groove 12a of the disk 12. This elastic belt 13 is adapted to engage either one of the annular grooves n, and n of each of the pins N N N to semi-fix these pins at their positions in which they protrude beyondeither one of the upper and the bottom faces of the disk 12.
  • a member 15 is fixed to the shaft 11.
  • a gear 14 is secured to the member 15.
  • a printed circuit baseplate 16 is provided concentrically with the shaft 1 1, and is fixed to the supporting plate 2.
  • two groups of contacts are provided on a base plate 16 about the shaft 11 concentrically therewith.
  • the inner group of contacts are comprised of three contacts for the changeover of the respective frequency bands, i.e., the band contact B, for the LOW VHF band, the band contact B for the HIGH VHF band, and the band contact 8;, for the UHF band.
  • the outer group of contacts are comprised of channel contacts T T T for applying tuning voltages of the respective channels to the variable capacity diodes.
  • channel contacts areconnected to independent variable resistors, respectively.
  • a coating of resistor is evaporation-deposited directly on the base plate 16.
  • the movable contact strip 17 is attached to the disk 12 integrally therewith and forms brushes 17a and 17b which slide between the band contacts 8,, B and B and the channel contacts T T T which are provided on the base plate 16, as the disk 12 is rotated.
  • a shaft 18 is rotatably supported on the supporting plates 1 and 2.
  • a gear 20 is fixed to the shaft 18.
  • the gear 20 meshes with the gear 9a of the third pulley 9.
  • a bobbintype supporting member 19 is fixed to the shaft 18.
  • leaves F F F in a number corresponding to that of the channels are rotatably supported by the supporting member 19.
  • the number of a given channel is indicated jointly by two of these leaves, i.e., by a leaf which is sustained by a holding pawl K and by another leaf which has been turned over downwardly as it was disengaged from the pawl K.
  • the number of the selected channel is indicated as being 10 by a leaf F n which is sustained by the pawl K and by another leaf F which has been turned over downwardly.
  • FIG. 3 the portion enclosed by one-dot-chain line which is indicated by reference symbol Y is shown in an exploded fashion relative to the other portions.
  • a rotational angle setting member 21 for use in the pre-setting of selectable channels is rotatably mounted on a shaft 22 which, in turn, is supported by the supporting plate 2.
  • a fourth pulley 21a is provided on the member 21 integrally therewith.
  • a belt 23 is mounted between the third pulley 9 and the fourth pulley 21a.
  • An electromagnet 24 is provided so as to face the circumference of the disk 12 (FIG. 4).
  • This electromagnet 24 has a pole-contacting member 25 which is urged by a spring 26 in the direction away from the iron core.
  • a pin 27 extends from one end of the pole-contacting member 25.
  • a first arm 28a for operating a self-holding switch SW, of the electromagnet 24 and a second arm 28b for operating a power switch SW,, of the motor circuit are formed at the other end of the pole-contacting member 25.
  • This pin 27 is able to enter into and retreat from the paths of movement of the position-limiting pins N N N of the disk 12.
  • a V-shaped lever 29 has two arms 29a and 29b and is urged to rotate counter-clockwise by a spring 30.
  • the arm 29a of the lever 29 enters into the paths of movement of the positionlimiting pins of the disk 12.
  • the other arm 29b operates a normally closed main switch SW of the energizing circuit of the electromagnet 24.
  • a ratchet pawl 31 is urged by a spring 32 to rotate counter-clockwise and acts upon the ratchet teeth R R R of the disk 12.
  • FIG. 7 there is shown a mechanism for operating the position-limiting pins N N N of the disk 12 to deal with the direction of their protrusion.
  • the disk 12 and the position-limiting pins are shown as an integral body at 33 for the sake of convenience.
  • a cover 34 which can be opened and closed about a shaft Q is attached to the manually operable block of the pin operating mechanism.
  • a switch operating member 35 is associated by its arms 35a and 35b with a power switch SW of the electromagnet 24 and also with a first auxiliary switch SW of the motor circuit. When the cover 34 is closed, the switch operating member 35 is pushed by a part of the cover 34 to open the power switch SW by the arm 35a of the member 35 while the auxiliary switch SW is closed by the arm 35b.
  • the switch operating member 35 is moved towards the left side in the drawing by virtue of the elasticity of the movable contact strips of the switches SW and SW as the elasticity acts on the arms 35a and 35b of this member 35.
  • the self-holding switch SW which makes the self-holding circuit of the electromagnet 24 moves in the direction of the arrow A shown in FIG. 4 to depart from the sphere of movement of the first arm 28a of the pole-contacting member 25.
  • a release button 36 for the position-limiting pins is urged towards the left side in the drawing by a spring 37.
  • One end of an intermediate lever 38 engages an end of a rod which extends from the button 36.
  • a pin 38a extends from the other end of the lever 38.
  • a release lever 39 is urged to rotate clockwise by a spring 40.
  • At one end of this lever 39 there are formed a slot 39a for receiving the pin 38a and a projection 39c capable of operating a second auxiliary switch SW of the motor circuit.
  • a pre-setting button 41 for the position-limiting pins is urged by a spring 42 towards the left side in the drawing.
  • a setting lever 43 is urged to rotate counterclockwise by a spring 44. One end of this setting lever 43 engages an end portion of a rod extending from the button 41, and the other end 43a enters into the path of movement of the position-limiting pins.
  • FIG. 8 there is shown the circuit for actuating the motor 4 and the electromagnet 24.
  • the switch SW is one for performing remote control operation in switching over the channels.
  • the switch SW is positioned, for example, at the front face of a television receiving set, and it is operated by a channel switching button.
  • a shaft 45 is rotatably supported by a supporting plate in an appropriate manner not shown. This shaft 45 is also coupled to a shaft 11 via a gear in a manner not shown so that the shaft 45 is rotated at a speed which, for example, is twice as great as that of the rotation of the shaft 1 1.
  • a magnetizable wheel 46 having projections C C C which are provided at equal intervals on'the periphery thereof is secured to the shaft 45.
  • a permanent magnet 47 is fixed to an attachment member 48 and has an iron core 49 formed on that side facing the magnetizable wheel 46.
  • a coil 50 for detecting a signal is secured to the iron core 49.
  • FIG. 10 there is shown another example with respect to the mechanism associated with the disk 12 and with the electromagnet 24.
  • the members indicated by reference numerals 11, 12 and by reference numerals 24-30 are parts similar to those indicated by like reference numerals in the above-stated example
  • a polecontacting member 25 is provided with a stepped portion 25a.
  • a holding lever 51 having two arms 51a and 51b is urged to rotate counterclockwise by a spring 52 and is rotatably mounted on a shaft 53.
  • a switch SW is additionally connected between the cir-' cuit of the motor 4 and the circuit of the power source. This switch SW is normally closed and is opened only when its connection is changed over by the arm 29b of the lever 29.
  • the ratchet teeth R R R shown in the preceding example engage, in this example, the pin 27 one at a time to determine the position of the respective channels of the disk 12.
  • the tuning mechanism having the foregoing arrangements is operated in the manner as described hereunder.
  • a channel No. 10 is selected.
  • a channel switching button provided on the front side of a television receiving set not shown is operated, so that the switch SW in the circuit shown in FIG. 8 is closed.
  • the electromagnet 24 is energized, so that its pole-contacting member 25 is attracted thereto against the force of the spring 26 to the position indicated by one-dot-chain line shown in FIG. 4.
  • the pin 27 retreats to the outside of the path of movement of the position-limiting pin N which is received in the hole P of the channel selection disk 12.
  • the two arms 28a and 28b of the pole-contacting member 25 cause the selfholding switch SW, and the power switch SW to close,
  • the electromagnet 24 will henceforth be held continuously in its operative condition, so that the motor circuit is rendered to the closed state. Accordingly, the rotary shaft 4a of the motor 4 is rotated in the direction of the arrow shown in FIG. 3 (this direction will hereinafter be referred to simply as clockwise). This rotation causes the third pulley 9 to rotate clockwise same as the shaft 4a via the first pulley 5, the belt 8, the second pulley 7 and the frictional face 7a.
  • the channel selection disk 12 is rotated counter-clockwise via the gear 9a, the gear 14, the member 15 and the shaft 11 on the one hand, and the supporting member 19 is rotated counter-clockwise via the gear 9a, the gear 20 and the shaft 18 on the other hand.
  • the electromagnet 24 is de-energi'zed, so that its polecontacting member 25 is returned to the position shown in solid line in FIG. 4.
  • the pin 27 enters into the path of movement of the position-limiting pin N
  • the switches SW, and SW5 are both opened. Since the motor 4 will rotate continuously for a short while subsequent to the opening of the switch SW due to inertia, the disk 12 will also rotate accordingly.
  • the pin N is brought into contact with the pin 27. Along with this, the disk 12 is halted.
  • the movable contact strip 17 which is fixed to the disk 12 follows the movement of the disk 12.
  • the slidable brushes 17a and 17b are connected to the band contact B of the HIGH VHF band and to the channel contact T respectively.
  • the tuning circuit for the channel No. 12 is completed by the completion of connection, so that the telecast in channel No. l2 may be received.
  • the supporting member 19 is rotated again.
  • the leaf F and the leaf F which isomitted are disengaged from the holding pawl K from their state shown in FIGS. 6a and 6b, and they are turned over downwardly. whereupon, the leaves F and F both of which are omitted will then be exposed to indicate the number 12 of the selected channel No. 12. In this way, the telecast channel is switched from the channel 10 over to the state of receiving the broadcast in channel 12.
  • the channel switching member not shown is operated again. Whereupon, the switch SW is closed again. Thereafter, the aforesaid series of operation are repeated.
  • the disk 12 is brought to a halt when the next protruding pin N is positioned in which it contacts the pin 27, and thus the broadcast in channel 13 is selected.
  • the channel switching member is'pushedcontinuously up to the time slightly before the indication of the desired number of channel appears on the channel number indicating section. By doing so, the aforesaid series of operation will be repeated automatically so that the selection of channel is performed quickly.
  • the tuning means of the present invention it is possible to perform remote control operation with no difficulty. More specifically, by connecting the switch SW shown in FIG. 8 via a cable, this switch SW is operated at a distance from the television receiving set. In this case, a series of operation which are similar to those which would be performed when the switch SW is actuated can be performed. 9
  • the selectable channels which are pre-set are channel numbers 1, 3, 4, 6, 8, 30, 31 and 34. These pre-set channels will have to be set to comply with the channel arrangement in the individual telecast receiving sites, since the broadcast channel arrangement may differ from each other depending on the countries or districts. In such an event, it is only necessary to operate the manual operating buttons 36 and 41 which are provided in the mechanism for setting and releasing channel presetting pins shown in FIG. 7.
  • the switch operating member 35 moves the positions of the movable contact strips of the switches SW and SW so that the switch SW is closed while the switch SW is opened.
  • the self-holding switch SW, of the electromagnet 24 departs away from the scope of action of the first arm 28a of the pole contacting member 25 and it is held in the state of being opened. It is only necessary to depress the release button 36 in order to cause, in the aforesaid state of the switch, the retreat of the position-limiting pins of the channel selection disk 12 which are now protruding onto that side of the disk where the lever 29 is provided.
  • this release button 36 causes the intermediate lever 38 to be rotated clockwise, so that the release lever 39 is rotated counterclockwise.
  • This counter-clockwise rotation of the release lever 39 causes the second auxiliary switch SW to be closed, so that the motor 4 is rotated accordingly to rotate the disk 12.
  • the tapered bent portion 39b of this lever 39 is brought into contact with the lower end portions of pins N of the disk 12 which are protruding on that side of the disk where the lever 29 is provided to act to push these pins N toward the other side of the disk 12, so that all of these pins N are caused to protrude onto the other side of the disk 12.
  • the end portion 43a of the setting lever 43 pushes the protruding heads of the pins N so that these pins will be caused to protrude onto the other side of the disk 12 where the lever 29 is provided.
  • the pins N are pre-se t in accordance with the channels established at the individual sites of receiving telecasts.
  • the tuning circuit for the desired channel is connected automatically so that the desired telecast can be received.
  • one of the projections C of the magnetized wheel 46 passes a point of proximity of the iron core 49 for every partial revolution of the disk 12 corresponding to an individual channel, i.e., l/36th of one whole revolution in case of the example illustrated.
  • an individual channel i.e., l/36th of one whole revolution in case of the example illustrated.
  • By counting these pulses as signals it is possible to effect a shifting the number of channels to such a number as is corresponding to these signals.
  • nU mV the number of the projections of the magnetizable wheel 46
  • U the rotation speed of the wheel 46
  • m the number of holes of the channel selection disk 12
  • V the rotation speed of the channel'selection disk 12
  • the channel is selected as in the preceding example.
  • a change is accomplished by operating the channel button, in the manner same as that described above in connection with the preceding example.
  • the switch SW of the electromagnet circuit is closed, and accordingly its pole-contacting member 25 is attracted thereto (to the position indicated by dotted line).
  • the holding lever 51 which till then has been held at the position indicated by one-dot-chain line by the stepped portion 25a of the pole-contacting member 25 is released therefrom. Accordingly, this freed lever 51 is rotated counterclockwise up to the halt position shown by dotted line.
  • the pole-contacting member 25 will be held in its attracted position even after the electromagnet 24 is de-energized.
  • the rotation of the motor 4 resulting from the closure of the switch SW is transmitted to the respective coupled members in the same way as that for the preceding example.
  • the arm 29a of the lever 29 With the rotation of the disk 12, the arm 29a of the lever 29 is brought into contact with the pin N Whereby, the lever 29 is rotated counter-clockwise against the force of the spring 30, and this rotation of the lever 29, in turn, causes the holding lever 51 to be rotated clockwise against the force of the spring 52.
  • the pole-contacting member 25 is freed.
  • the lever 29 effects the changeover of the switch SW to shut out the supply of power to the motor 4.
  • the indication of channel numbers may be performed by relying on the drum system or the belt system, in addition to the aforesaid leaf system. Also, it is possible to use, as a variable capacity element for the tuning purpose, an element which varies its capacity due to some other factor, in place of using such a variable capacity diode as stated above which varies its capacity by the applied voltage. Also, the number of the channels carried on the disk 12 may be selected as described. Furthermore, the channel selecting mechanism of the aforesaid tuning means may be applied to radio broadcast receiving sets.
  • a broadcast channel selecting mechanism of tuning means comprising:
  • variable capacity element contained in a resonant circuit and capable of varying its capacity in accordance with an applied signal
  • variable capacity element a plurality of signal level setting means connected to said variable capacity element and capable of applying signals of various different levels to said variable capacity element pre-determined in accordance with independently selected channels changeover means associated with said signal level setting means and said variable capacity element and capable of switching the connection between said variable capacity element and the signal level setting means to selectively apply said signals to said variable capacity element,
  • a rotary means connected to said changeover means for operating said changeover means in accordance with its rotary angle
  • a motor connected to said rotary means and controlled of its rotation in accordance with the make and break of its switch channel position limiting means on said rotary means at positions corresponding to positions of receivable channels among the positions of all channels provided at spaced intervals for every constant rotational angle of said rotary means
  • an electromagnet provided adjacent to said channel position limiting means and having a polecontacting means engageable with said limiting means self-holding means associated with said polecontacting means for holding said pole-contacting means at a position in which said pole-contacting means is attracted to said electromagnet, and a release means provided adjacent to said rotary means and entering into the path of movement of said selected channel position limiting means and being adapted to be shifted in its position immediately before said rotary means is halted by the action of said pole-contacting means applied to the rotating rotary means to thereby set said self-holding means free, said pole-contacting means being adapted to actuate said self-holding means and also to close the motor switch whenever said pole-contacting means is attracted to said electromagnet, and being adapted to depart away from said electromagnet and to halt the rotation of said rotary means upon the, releasing of said self-holding means.
  • a broadcast channel selecting mechanism of tuning means in which said mechanism further comprises an indicating means interlocked with said motor and driven in synchronismwith said rotary means to digitally indicate the respective receivable channel numbers of all channels.
  • variable capacity element is a variable capacity diode capable of varying its capacity by the applied signal voltages.
  • a broadcast channel selecting mechanism of tuning means in which said changeover means is a mechanism for switching the connection of contacts and comprises slidable brushes and contacts.
  • a broadcast channel selecting mechanism of tuning means in which said changeover means are electric means adapted to detect the rotational angular position of said rotary means by virtue of a magnetic induction mechanism containing a magnetic head and adapted to changeover the switching circuit connection by virtue of the detected signals.
  • a broadcast channel selecting mechanism of tuning means in which said selected channel position limiting means are pins protruding onto the face of said rotary means acting upon said release means at the selected position.
  • a broadcast channel selecting mechanism of tuning means in which said pins are provided so as to be able to protrude and retreat with respect to said face and have notches formed at two positions and are capable of being held semi-fixedly at eical figure to be indicated and being turned over one at a time for said every constant rotational angle assumed by said rotary means.
  • a broadcast channel selecting mechanism of tuning means in which said selected channel position limiting means comprises pins and notches provided on said rotary means.
  • a broadcast channel selecting mechanism of tuning means in which said mechanism further comprises a remote control switch connected in parallel with said manually operable switch means.
  • a broadcast channel selecting mechanism of tuning means in which said selfholding'means is a switch means connected in parallel with the manually operable switch means of said electromagnet circuit.
  • a broadcast channel selecting mechanism of tuning means in which said selfholding means is a lever adapted to mechanically engage said pole-contacting means of the electromagnet at its attracted position to hold said pole-contacting means at this position.
  • a broadcast channel selecting mechanism of tuning means in which said rotary means includes a disk and pins having a length greater than the thickness of the disk and they are arranged so that when the pins are in a first position, they protrude onto oneside of said disk to assume the re-setting position and that when the pins are in a second position, they protrude onto the other side of said disk to assume the position of a selected channel; and said mechanism further comprises a normally opened first auxiliary switch of the motor for connecting the motor to a power source; a re-setting lever having a tapered portion operative so that, during a first operation, this tapered portion enters into the path of movement of said pins assuming their first position to cause these pins lying in their first position to move towards their second position one after another, and also having a working portion for closing said auxiliary switch of the motor; a pre-setting lever having a striking portion operative so that, during said second operation, it acts to move the pins assuming their first position towards their second position one after another;

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US00202745A 1970-12-02 1971-11-29 Broadcast channel selecting mechanism having motor operated rotary member Expired - Lifetime US3740679A (en)

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JP45106549A JPS5129601B1 (US20050065096A1-20050324-C00039.png) 1970-12-02 1970-12-02

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JP (1) JPS5129601B1 (US20050065096A1-20050324-C00039.png)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824507A (en) * 1973-03-23 1974-07-16 Rca Corp Parity of tuning apparatus
US3828285A (en) * 1971-12-06 1974-08-06 Hitachi Ltd Electronic tuner
US3978438A (en) * 1974-03-01 1976-08-31 Alps Electric Co., Ltd. Tuning control apparatus
US4056794A (en) * 1975-06-25 1977-11-01 Matsushita Electric Industrial Co., Ltd. Channel selection mechanism for an electronic tuner

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53162032U (US20050065096A1-20050324-C00039.png) * 1977-05-26 1978-12-19
JPS5529195U (US20050065096A1-20050324-C00039.png) * 1978-08-17 1980-02-25
JPS6382968A (ja) * 1986-09-15 1988-04-13 イー・アイ・デユポン・デ・ニモアス・アンド・カンパニー マイクロ波加熱できる組合わせ包装及びサービス容器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3679980A (en) * 1969-07-07 1972-07-25 Standard Kollsman Instr Corp Solid state television tuner with voltage variable capacitors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3679980A (en) * 1969-07-07 1972-07-25 Standard Kollsman Instr Corp Solid state television tuner with voltage variable capacitors

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828285A (en) * 1971-12-06 1974-08-06 Hitachi Ltd Electronic tuner
US3824507A (en) * 1973-03-23 1974-07-16 Rca Corp Parity of tuning apparatus
US3978438A (en) * 1974-03-01 1976-08-31 Alps Electric Co., Ltd. Tuning control apparatus
US4056794A (en) * 1975-06-25 1977-11-01 Matsushita Electric Industrial Co., Ltd. Channel selection mechanism for an electronic tuner

Also Published As

Publication number Publication date
DE2159593B2 (de) 1978-07-20
DE2159593A1 (de) 1972-06-15
JPS5129601B1 (US20050065096A1-20050324-C00039.png) 1976-08-26
DE2159593C3 (de) 1979-03-22

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