US3644027A - Random selection system for a slide projector - Google Patents

Random selection system for a slide projector Download PDF

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Publication number
US3644027A
US3644027A US739353A US3644027DA US3644027A US 3644027 A US3644027 A US 3644027A US 739353 A US739353 A US 739353A US 3644027D A US3644027D A US 3644027DA US 3644027 A US3644027 A US 3644027A
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Prior art keywords
contact
slide
seeking
tray
motor
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US739353A
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Frank P Bennett
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View Master International Group
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GAF Corp
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Assigned to VIEW-MASTER INTERNATIONAL GROUP, A LIMITED PARTNERSHIP OF N.Y. reassignment VIEW-MASTER INTERNATIONAL GROUP, A LIMITED PARTNERSHIP OF N.Y. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GAF CORPORATION
Assigned to VIEW-MASTER INTERNATIONAL GROUP, INC. reassignment VIEW-MASTER INTERNATIONAL GROUP, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VIEW-MASTER INTERNATIONAL GROUP, A LIMITED PARTNERSHIP OF NY
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Assigned to MIDLANTIC NATIONAL BANK reassignment MIDLANTIC NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VIEW-MASTER IDEAL GROUP, INC.
Assigned to MIDLANTIC NATIONAL BANK reassignment MIDLANTIC NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VIEW-MASTER IDEAL GROUP, INC.
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B23/00—Devices for changing pictures in viewing apparatus or projectors
    • G03B23/02—Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor
    • G03B23/06—Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor with rotary movement

Definitions

  • the random selection system consists of an attachment unit which is detachably mounted on the housing of the slide projector, a remote control unit which is separate and remote from the slide projector, and an extension cable connecting these units.
  • the attachment unit contains a commutator.
  • the remote control unit includes receiving means in the form of DC motor parts.
  • the commutator acts as a transmitter and the motor parts as a receiver for stepping or rotating the rotor in synchronization with rotation of the movable component of the commutator.
  • the rotor drives a seeking contact for movement in an arcuate path.
  • PAIENTEUFEBZZ I972 3.644.027
  • PATENTEDFEB 22 I972 sum as or 11 T m5 5 TN :V: M T V T w
  • a PATENTEBFEB 22 I972 SHEET IUUF 11 INVENTOR FRANK P BENNET BY j,MM@ J ATT'YS.
  • Another primary object of the present invention is the provision of a random selection system for a slide projector, which system utilizes transmitting and receiving means which in a preferred form consist of a DC stepping motor with a remote commutator.
  • Another object of the present invention is the provision of a random selection system of the type described, which system has a so-called short-way home" feature, i.e., in the case of a circular slide tray for example, the tray is rotated automatically in a direction resulting in the minimum amount of rotational movement in presenting the selected slide adjacent the slide projection gate of the projector.
  • Still another object of the present invention is the provision of a random selection system of the type described, which system includes simplified selector means adapting the system for alternately accommodating two types of slide trays, these trays differing in the number of slide-receiving spaces they contain.
  • Another object of the present invention is the provision of a random selection system for a slide projector, which system does not require major changesor alterations to the associated slide projector.
  • Still another object of the present invention is the provision of a random selection system of the type described, which system includes a control box remote from the projector and including means for selecting any one of the slide-receiving spaces in the slide tray as well as including means for advancing or reversing the slide tray one slide-receiving space at a time.
  • FIG. 1 is perspective view of the components constituting the random selection system according to the present invention showing the same associated with a slide projector;
  • FIG. 3 is a view similar to FIG. 2 showing the remote unit with the initiate button" removed and also showing an indicator masking plate in a position different from that shown in FIG. 2;
  • FIG. 4 is a section taken generally along the line 4-4 of FIG. 3 with certain parts being removed;
  • FIG. 6 is a perspective view of the other side of the disk shown in FIG. and primarily showing the means constituting arcuate contact strips;
  • FIG. 7 is a perspective view of the remote control housing with the cover thereof removed, this view primarily showing the l00-slide contact gear and the 80-slide contact gear;
  • FIG. 8 is a view of the l00-slide and 80-slide gear in assembled relation
  • FIG. 9 is a perspective view of the 80-slide contact gear only
  • FIG. 10 is a perspective view of the 100-slide gear
  • FIG. 11 is a perspective view of the other side ofthe 80-slide gear
  • FIG. 13 is a fragmentary section taken along the line 13-13 of FIG. 2;
  • FIG. 13A (adjacent FIG. 5) is a fragmentary view taken along line 13A'13A of FIG. 13;
  • FIG. 14 is an enlarged view of the attachment unit taken along the line 14-14 of FIG. 1 showing this unit with the housing removed;
  • FIG. 15 is a top plan view of the attachment unit as seen in FIG. 14;
  • FIG. 16 is a view taken along the line 16-16 of FIG. 1 showing the attachment unit with its housing removed;
  • FIG. 17 is a perspective view similar to FIG. 16;
  • FIG. 18 is a perspective showing the bottom of the attachment unit and the side thereof shown in FIG. 16;
  • FIG. 19 is a view taken along the line 19l9 of FIG. 14;
  • FIG. 20 is an electrical schematic of the random selection system
  • FIG. 21 is an electrical schematic of the DC stepping motor and remote commutator therefor;
  • FIG. 22 is a perspective view of the rotor of the DC stepping motor
  • FIG, 23 is an enlarged, fragmentary, top plan view ofa 100- slide tray
  • FIG. 24 is an enlarged plan view of the teeth on such tray
  • FIG. 25 is a top plan view of the tray drive gear
  • FIG. 26 is an enlarged, fragmentary, top view of the teeth on an -slide tray.
  • the random selection system includes a remote control unit 10 and an attachment unit 12, the latter being detachably mounted on a slide projector 14.
  • the remote control unit 10 and the attachment unit 12 are connected together by a multiconductor extension cable 15.
  • a multiconductor extension cable Preferably, at least one end of this cable is connected to a multiterminal jack (not shown) for detachable engagement with either the unit 10 or the unit 12 to facilitate storage of these units when not in use.
  • the remote control unit 10 includes a housing definedby a rectangular base 16 and a shell-piece 17.
  • the unit 10 includes a slide selector knob 18 having an initiate button" 20 mounted centrally thereof.
  • This unit also includes a so-called one-slide advance button 21 and a one-slide reverse button" 22.
  • a 80-100 selector arm 24 is mounted on this unit.
  • the top wall of the shell 17 has an aperture therein defining a window preferably containing a transparent plate 25 having a reference line or mark 26 thereon.
  • the remote control unit 10 includes a rotatably mounted disk, generally designated 28, which disk has an integral hub portion 29 (which defines the knob 18) on one face thereof, this face bearing a first dial scale 30 and an 80 dial scale 31.
  • a rotatably mounted disk generally designated 28
  • the hub 29 mounted within the hub 29
  • a metal bracket 35 having a pair of brush arms or contacts 35a, this bracket being secured to the disk 28, (which is formed of dielectric material) by a fastener 36.
  • a similar metal bracket 38 includes a pair of brush arms or contacts 38a, this bracket being secured to the disk 28 by a fastener 39.
  • the brush arms 35a and 38a are vertically spaced from each other and therefore electrically insulated from each other in all relative positions.
  • the disk 28 includes a central bore
  • a fixed contact button 42 is mounted on a small disk 43, the latter being suitably mounted within the hub 29 in vertical spaced relation with the bore 40.
  • the disk 43 mounts a spring arm or movable contact 44 which is normally in spaced relation with the contact button 42, the former being adapted to be engaged by the initiate button 20 for closing the contacts 42, 44 when such button is depressed.
  • FIG. 6 The other face of the disk 28 is illustrated in FIG. 6. This face mounts a first annular series ofdetents 46 defining a socalled 100-slide" wheel and a second annular series of detents 47 defining a so-called 80-slide wheel. Mounted within these formations is a first pair of arcuate contact strips 49 and 50, adjacent ends of these strips being in spaced relation and forming dielectric areas 51 and 52.
  • the lower face of the disk 28 also mounts an annular contact ring 53 and a further arcuate contact ring 54. It will be understood that all contact rings or strips are electrically insulated from each other.
  • the brush arms 35a are electrically connected with the an nular contact strip 53 by means of the fastener 36; in like manner, the brush arms 38a are electrically connected with the arcuate contact strip 54 by means of the fastener 39.
  • the diodes 34 connect annular contact member 53 with arcuate contact strips 49 and 50; the diodes 33 connect the arcuate strip 54 with the contact strips 49 and 50.
  • the arrangement of the diodes is such that contact strips 49 and 50 are provided respectively with positive and negative DC voltage.
  • the disk 28 is rotatably mounted on a central post 56 (FIGS. 7 and 12), which post includes four contact rings 57, 58, 59 and 60 electrically and physically separated by intermediate dielectric bands, It will be understood that when the disk 28 is mounted in place on the post 56, the contact wipers 35a wipe or engage the ring 57 and the wipers 38a wipe or engage the ring 58.
  • the gear 62 Rotatably mounted on the post 56 just below the disk 28 is a so-called l-slide gear 62 (FIGS. 8 and having a series of teeth 63.
  • the gear 62 includes a central, circular opening 64 defining its bearing surface.
  • This gear also contains a generally U-shaped cutout including legs 65, 66 which communicate with the opening 64.
  • An inverted U-shaped metal contact bracket 68 is mounted on the gear 62 (which is formed of dielectric material) by fasteners 69, the ends of this bracket being received in the cutout portions 65 and 66.
  • the bracket 68 includes an integral arm 70 mounting a seeking contact 71 at the end thereof.
  • the bracket 68 includes an integral pair of contact arms 68a.
  • a so-called 80-slide gear 74 having an annular series of gear teeth 75.
  • the gear 74 is dished out and includes an integral, upstanding hub formation 76 which mounts a contact ring 78.
  • the upper end of the formation 76 also mounts an arcuate contact strip 79 by means of fasteners 80.
  • Strip 79 includes an integral arm 81 mounting at the outer end thereof a seeking contact 82.
  • Mounted on the strip 79 is another contact strip which includes a pair of contact wiper arms 79a, which arms are in wiping engagement with the ring 59 on the post 56. It will be understood the bracket 79 and the various contacts thereon are all in insulated spaced relation from the contact ring 78.
  • the gear 74 includes a central bore 84 which extendsthrough the hub formation 76.
  • the underside of the gear 74 (FIG. 11) supports a contact bracket 85 by means of a fastener 86.
  • This bracket includes integral contact arms or wipers 85a which wipe or engage the contact ring 60 on the post-56.
  • a conductor wire 87 defines an electrical connection between the ring 78 and the contact bracket 85.
  • the post 56 is suitably mounted centrally of a dished-out member 89 (FIG. 12) which member is in turn supported on a plate 90.
  • the member 89 has an annular rim 89a which engages the underside of the gear 74 and thereby rotatably supports the latter.
  • the gear 62 is rotatably supported by engagement of its bearing surface 64 with the hub formation 76 on the gear 74.
  • the plate 90 is mounted in vertical spaced relation from the base 16 by a plurality of posts 91. This plate mounts a bracket 93 which in turn mounts a gear 94 integral with a pinion gear 95. As noted in FIG. 7, the pinion gear 95 meshes with the teeth 63 and 75 on the gears 62 and 74, respectively. As will be explained more fully hereinbelow, the gear 62 includes a greater number of teeth 63 than the number of teeth 75 on the gear 74. Accordingly, the pinion gear 74 which is rotated at a constant rate, will drive the gear 74 at a greater velocity or annular rate than the gear 62. Gear 94 meshes with a gear 96 which is mounted on the output shaft of a DC stepping motor 97, the latter being suitably mounted between the base 16 and the plate 90.
  • the selector switch member 24 is integral with a bar 99, the latter being suitably mounted on the plate 90 for reciprocal sliding movement.
  • the bar 99 includes a notch 100 in the underside thereof which receives the operating member or button 101 of a two-position switch (not shown) which is of conventional construction.
  • the end of bar 99 remote from the member 24 mounts an integral bracket 102 having an aperture 103 and a horizontally disposed leg 104.
  • the aperture 103 in the bracket portion 102 rockably mounts a swivel member 105, the latter being in abutting relation with one end of a coil spring 106.
  • the coil spring encircles a stem member 108 which is integral with a hemispherical formation 190. It will be understood the formation 109 and its stem 108 are movable relative to the swivel 105, the spring 106 serving to urge these members apart.
  • the hemispherical formation 109 is rockably received in an aperture 110 (FIG. 4) defined in a tab integral with a detent actuator 112.
  • This actuator is pivotally mounted about a pin 113, the latter being mounted from a block 114 which is in turn suitably supported on the plate 90.
  • the block 114 includes bores 115 and 116 respectively mounting a pair of detent balls (not shown) positioned for being alternately biased into engagement with the detent formations 46 and 47 on the disk 28.
  • the actuator 112 includes generally oppositely disposed arms 117 and 118 having formations (not shown) on their distal ends for engagement of the detent balls.
  • One end of the arm 121 is pivotally mounted from a post 122 (FIGS. 7 and 12) suitably supported from the plate 90.
  • the other end of the arm 121 is pivotally connected to a masking plate 123 which is arcuate in shape and adapted alternately to mask portions of the dial scales 30 and 31.
  • the masking plate includes an integral leg portion 124 the distal end of which is pivotally mounted to one end of an arm 125; the other end of this arm is pivotally mounted from a post 126.
  • the switch actuator 101 When the selector arm 24 is moved to the 100-s1ide position, the switch actuator 101 is positioned for establishing the appropriate circuitry (which will be explained hereinbelow), the masking plate 123 is positioned for obscuring a portion of the 80-slide dial 31 and the actuator 112 is rocked for biasing one of the detent balls into engagement with the detent formations 46. The detent ball will be yieldably engaged with these detent formations by the action of the spring 106.
  • the switch actuator 101 When the selector 24 is moved to the 80-slide position, the switch actuator 101 is moved to its other position, the masking plate 103 1 then obscures a portion'of the IOU-slide indicator dial 30, and
  • the other detent ball is yieldably urged intoengagement with the detent formations 47.
  • the disk 28 is preferably formed of translucent material.
  • a diffuser plate 128 (FIGS. 2 and 3) is mounted beneath the disk 28 in alignment with the window 25 formed in the housing shell 17, this diffuser plate being mounted on a post 129 in turn supported from the plate 90.
  • a bulb 130 is mounted beneath this diffuser plate, a suitable opening being provided in the plate 90 to accommodate the bulb. The bulb is received in a conventional socket 132 supported from a bar 133 extending from the lower end of the post 129. It will be apparent the bulb 130 serves to illuminate the portion of the disk 28 which is visible through the window 25.
  • the advance button 21 is of stepped cylindrical construction and is mounted for vertical reciprocal movement in a split cylindrical formation 136 supported on the plate 90.
  • the lower end of the button 21 is of bifurcated construction for receiving one end of an actuator plate 137, the latter having an inclined cam surface 138.
  • the actuator plate is mounted in a slot 90a in the plate 90 for horizontal reciprocal sliding movement relative thereto.
  • the button 21 includes an inclined cam surface (not shown) for complementary engagement with the cam surface 138 thereby causing the actuator 137 to be slid inwardly of the plate 90 when the button21 is depressed.
  • the actuator 137 has an upstanding portion 139 mounting a pair of detent fingers 140 and 141 for respective engagement with detent formations 46 and 47.
  • the actuator 137 has the inner end thereof supporting a dowel (not shown) received in one end of a spring 143 (FIG. 13). This end of the actuator 137 carries a sleeve 144 for confining a portion of the spring 143.
  • the actuator 137 has a depending portion 145 mounting a fastener 145a for actuating engagement with a contact strip 146, the latter having a plate portion 146a secured to the underside of plate 90 by a fastener 147.
  • the reverse button 22 is identical with the button 21 and is associated with an actuator 149 identical with the actuator 137 and in opposite hand relation therewith.
  • the actuator 149 supports detent fingers 150 and 151 and for engagement with detent formations 46 and 47, respectively.
  • This actuator carries a dowel 153 which is received in the other end of the spring 143.
  • a depending portion 154 of the actuator mounts a fastener 154a arranged for actuating engagement with a contact strip 155.
  • a plate 155a integral with this contact strip is secured to the underside of the plate 90 by a fastener 157.
  • the spring 143 acts to urge the actuators 137, 149 apart for normally holding the buttons 21 and 22 in their uppermost positions.
  • the fingers 140, 141 are brought into engagement with respective detent formations 46 and 47 for detenting the disk 28 through an increment determined by which of the formations 46 and 47 is being engaged by the above-mentioned detent ball.
  • the reverse button 22 is depressed, the disk is detented in an opposite direction.
  • the contacts 146, 155 are closed.
  • the attachment unit 12 includes a housing shell enclosing framework primarily consisting of upper and lower frame plates 159 and 160, respectively, held in parallel-spaced relation by a plurality of posts 161.
  • This framework mounts a small, reversible-drive motor 162 which is of conventional design and includes an output shaft 163 mounting a gear 164.
  • a gear reduction system is defined by a gear 165 being integral with another gear 166 both mounted for rotation about a pin 167 supported from the frame plate 159.
  • the gear 166 meshes with an intermediate gear 168 which is rotatably mounted on a pin 169 also supported from the frame plate 159.
  • Gear 168 is integral with a smaller gear 170 which meshes with a larger gear 172 fixed to the upper end ofa commutator shaft 173.
  • a suitable slip drive connection (not shown) is provided to prevent damage to the aforedescribed gear train in the event of a jam anywhere in the mechanism.
  • the commutator shaft 173 has an enlarged central portion supporting a first contact ring defined by three separate segments 175a 175b, and 1750 (FIG. 21) which are electrically insulated from each other.
  • the commutator also includes three continuous contact rings 176, 177 and 178; it will be understood these three rings are respectively connected to the segments 175a through 175a by suitable connections within the interior of the commutator shaft.
  • a pair of brush bars 180 and 181 (FIGS. 14, 16 and 17). These brush bars mount a first pair of brushes 182, 183 in l80 oppositely disposed relation for wiping engagement with the segments 175a through 175C.
  • the brush mounting bars 180, 181 mount second, third and fourth pairs of brushes 185, 186 and 187 which are in respective wiping engagement with the rings 176, 177 and 178 on the commutator.
  • the commutator shaft 173 carries a gear 189 (FIG. 16) adjacent the lower end thereof, this gear being in meshing engagement with a larger diameter gear 190 mounted on a subshaft 191. Opposite ends of this subshaft are suitably journaled in the frame plates 159, 160.
  • the upper end of the subshaft 191 carries a gear 192 in meshing engagement with a gear 193 mounted on a drive shaft 195.
  • This drive shaft is connected to the gear 194 by means of a spline connection (not shown) permitting the shaft 195 to be slid back and forth between upper and lower positions and at the same time maintaining its driven relationship with the gear 194.
  • the drive shaft 195 mounts a drive gear 196 at the lower end thereof, the teeth of this gear being adapted for meshing engagement with the teeth 197 (FIG. 1) formed around the lower periphery of a circular slide tray 198.
  • a button 199 is mounted on the upper end of the shaft 195 to provide a convenient means for raising and lowering this shaft to engage and disengage the drive gear 196 from the teeth 197 of the circular slide tray.
  • the slide tray 198 shown for purposes of illustration has 100 slide-receiving spaces and an equal number of teeth 197.
  • An 80-slide circular slide tray (not shown) has 80 peripherially disposed teeth for engagement by the gear 196.
  • the teeth on the gear 196 and the teeth on both of the trays are configured as explained below such that rotation of the gear 196 through an arc defined by 360 divided by the number of teeth on this gear the slide tray 198 will be rotated through 3.6" and the 80-slide tray will be rotated through 4.5.
  • Means are provided for locking and unlocking the gear 196, such means including a pair of locking pawls 201 (FIGS. 18 and 19) which are pivotally mounted about corresponding ends thereof on a pair of pins 202, the other ends of the pawls being adapted for locking engagement with the teeth on the gear 196 as seen in FIG. 19.
  • the pawls include first integral arms 203 which are apertured for receiving opposite ends of a bowed spring 204, the latter serving to urge the pawls to the locked position.
  • the pawls 201 include integral, second arms 205 arranged to be simultaneously engaged by a tab 206 formed on one end of a bellcrank member 208, the latter being pivoted about one of the pins 202.
  • the other end of the bell crank is pivotally engaged with one end of a push wire 290; the other end of this wire is pivotally connected to one end of a bellcrank 210 pivoted about a pin 211.
  • the other end of this bellcrank is pivotally engaged with a U-shaped bracket 212 mounted on the operating member 213 ofa solenoid 214.
  • a solenoid 216 has the actuating member thereof connected to a disk 217 for rotating the same in a counterclockwise direction as seen in FIG. 14.
  • This disk carries a pin (not shown) which extends through a slot 219 in an actuating plate 220, the lower end of which plate is received in a slot 221 (FIG. 18) thereby mounting the plate 220 for vertical reciprocal movement.
  • the upper end of the plate 220 has a bent-over tab 222 which is apertured for receiving a load pin 224, opposite ends of the latter being received in appropriate fittings or bushings mounted in the frame plates 159, 160 thereby mounting the pin 224 for vertical reciprocal movement.
  • a coil spring 225 encircles a portion of the pin 224; the upper end of this spring abuts the underside of the tab 222. The other end of this spring abuts a washer 226 which is suitably connected to the pin 224. It will be understood that when the solenoid 216 is energized the disk 217 is rotated for lowering the pin 224 to the lowermost position thereof which is illustrated in FIG. 14. When the solenoid is deenergized, a spring 228 serves to return the pin 224 to its uppermost position. One end of this spring is connected in a suitable aperture in the frame plate 159; its other end is connected to one end of a link 229, the other end of which link is connected to the pin (not shown) carried by the disk 217.
  • the framework within the attachment unit 12 also supports, by suitable bracket means, a transformer 230 and a pair of relays 231, 232.
  • a transformer 230 and a pair of relays 231, 232. The purpose and function of these components will be explained below in connection with the description of the electrical schematic.
  • the motor 97 which is of the DC stepping type, includes permanent magnet field pieces 235, 236 of north-south polarity, respectively, and a rotor 237 having three coil windings with the windings 2370, 237b and 2370 connected with slip rings 238-240 as shown.
  • These slip rings which are mounted on the shaft of the rotor as noted in FIG. 22, are wiped by suitable brushes 241-243 schematically illustrated in FIG. 21.
  • the brushes 241-243 are connected by the conductors 244-246 to respectivepairs of brushes 185 through 187.
  • the rings 176-178 on the commutator shaft 173 are respectively connected to contact segments 175a, 175b and 1750 by the conductors 248-250. It will be understood these connections are actually formed within the interior of the commutator shaft 173.
  • the brushes 182, 183 which engage only two of the segments 175a through 1750 at any one time, are provided with DC current through the lines 252, 253.
  • the commutator consisting of the rings 175-178 and the brushes 182-187 constitute a transmitter and the motor parts consisting of the pole pieces 235, 236 and the rotor 237 constit ute a receiver.
  • the rotor 237 will step or rotate in synchronization with rotation of the commutator shaft 173 by reason of signals generated by the transmitter, such signals being in response to rotation of the shaft 173.
  • the brushes 182, 183 which are provided with a source of direct current voltage, always engage two of the commutator segments 175a through 1750.
  • direct current is applied to any two of the segments 17511-1750, one coil of the rotor 237 will be connected across such rings and the two remaining rotor coils which are in series will be connected across the same two contact segments.
  • the magnetic field established by such energization rotates the rotor in conformance with known magnetic principles.
  • the coil 237a is energized in such a way that the magnetic flux developed has the south pole at the top of this coil which is thereby attracted to the permanent north pole piece 235.
  • the other two coils 23717 and 2370 are energized such that the magnetic flux developed has the north magnetic pole at the outer extremities of these two rotor coils thereby causing them to be attracted to the south magnetic pole piece 236. Therefore, the rotor 237 is rotated to and held in the position illustrated so long as the brushes 182, 183 engage the contact segments 175a, 175b.
  • the DC stepping motor with remote commutator as just described is not of course to be limited to the particular form illustrated and disclosed herein. Many variations are possible.
  • the permanent magnet field structure illustrated may have substituted therefor an electromagnetic field of well known and conventional configuration.
  • the receiver or rotor is not of course to be limited to three-pole construction, as it could, for example, be of five-pole construction.
  • the rotor may be a permanent magnet and the field defined by wound construction.
  • the energy required in the receiver is not reflected as a load on the transmitter or commutator.
  • the total energy absorption in the transmitter-commutator is the mechanical input required to rotate the shaft 173.
  • the receiver or rotor can be quite delicate and responsive to very low level signal inputs.
  • the power or torque capable of being generated by the rotor 237 is a function of the physical and electrical structure together with the amount of power switched to the rotor by the transmitter-commutator. Accordingly, it will be understood that from very low input a considerable amount of usable work can be obtained from the receiver or rotor 237. Therefore, the DC stepping motor with remote commutator described herein provides not only a device wherein one rotatable element will follow directions from a remotely disposed rotatable element, but also provides a device useful as a power amplifier as well.
  • the DC motor with remote commutator arrangement shown provides for absolute synchronization between the transmitter and receiver so long as the receiver is not loaded beyond its designed torque capabilities. It will be apparent that the rotor 237 can be rotated in either direction in response to corresponding direction of rotation of the commutator shaft 173.
  • the relay 231 controls three sets of switches consisting of movable contacts 255a, 256a, 257a and pairs of fixed contacts 255b, 2550, 256 b, 2560, 257b, 2570.
  • the movable contacts are biased to the positions illustrated; when the relay 231 is energized, the movable contacts are simultaneously moved to their other positions.
  • the relay 232 actuates a pair of switches consisting of movable contacts 258a, 259a, and associated pairs of fixed contacts 258b, 2580,259b, 2590.
  • the movable contacts of these switches are biased to the position illustrated. Energizing of the relay 232 results in movement of the movable contacts to their other position.
  • the projector includes a so-called half-cycle park switch which is represented herein by a movable contact 263a associated with a fixed pair of contacts 263b, 2630.
  • the half-cycle part switch is in the condition shown in FIG. 20.
  • the slide-changing mechanism has removed a slide from the gate and returned the same to the tray but has not yet positioned the next slide in the gate, i.e., when the slide-changing mechanism has moved through only one half of a cycle, the movable contact 263a is forced into engagement with the fixed contact 2630.
  • a load or actuating button is indicated at 264. As explained in the Hall application, operation-of this button restores a slide in the projection gate to its space in the tray.
  • the line 252 providing DC voltage to the stepping motor is connected between a pair of oppositely poled diodes 265 which are connected to the low-voltage side of the transformer 230. It will be noted that the line 253 is connected to a center tap on the low-voltage side of the transformer through the switch 258.
  • a voltage control network for the motor 162 is provided in the form of four diodes 266 connected in a bridge formation in shunt relation with the motor, this bridge arrangement having a diagonal connection including four diodes 267.
  • This control network is independent of line voltage variations over a range considerably greater than the expected variations from line voltage.
  • This control is required to maintain strict synchronization between the transmitter and receiver under opposite, extreme conditions, such as the occurrence of highline voltage at a time when the slide tray is unloaded, and the occurrence of line voltage less than usual at a time when the tray is heavily loaded.
  • the voltage control system just described controls motor speed within very narrow limits for maintaining precise synchronization under these two diverse conditions.
  • the circular slide tray 198 is fully loaded with slides and operatively positioned on the slide projector 14.
  • the unit 12 is attached to the projector and that the button 199 (FIG. 1) is depressed for bringing the drive gear 196 into meshing engagement with the teeth 197 on the slide tray.
  • the shaft 195 which rotates the drive gear is provided with an extension (not shown) on its lower end for actuating the disabling switch" described in the above-mentioned Hall application. Actuation of this disabling switch serves to interrupt the control circuit which causes rotation of the tray 198 when the random selection system is not being used.
  • this motor 162 rotates for driving the slide tray
  • this motor also rotates the commutator shaft 173 which, as previously explained, acts as a transmitter sending signals to the rotor 237 in the motor 97 whereby the latter is rotated or stepped in synchronization with rotation of the shaft 173.
  • the switch actuator 101 is positioned for disconnecting the seeking contact 71 and connecting the seeking contact 82 in the circuit.
  • the seeking contact 82 which has a random relationship with the seeking contact 71, is rotated at a greater angular rate as explained below.
  • This 80- slide tray will also be rotated at a greater rate by reason of the construction of the teeth on the same and the teeth on the drive gear 196, as will be explained in detail below.
  • FIGS. 23 through 26 The construction for driving the circular tray 198 and another 80-slide tray atdifferent rates from the gear 196- which is always rotated at a constant rate is shown in FIGS. 23 through 26.
  • the tray 198 is provided with 100 teeth 197. It will be noted these teeth are greater, in terms of arcuate extent, than the valleys or notches between the teeth.
  • the teeth 197 may be defined as being the result of laying out 200 teeth on the tray 198 and then forming or cutting every other tooth to provide the I teeth as shown.
  • the teeth 270 of a 80'slide tray 271 are shown in FIG. 26.
  • the outside diameter of such teeth is the same as the outside diameter of the teeth 197 on the tray 198.
  • 80 teeth 270 there are 80 teeth 270.
  • these teeth are formed by swinging a -pitch rack tooth cutter through l8 on each side of the radius 2700. It will be noted this technique provides the teeth 270 with curved faces 27%. It will be realized that when the gear I96 is stepped through one increment (36) the tray 271 will be rotated through 4.5", i.e., 360 divided by 80 teeth.
  • the teeth on the contact gears 62, 74 are fashioned in a similar manner such that these gears are driven at different rates from the pinion 95 which is rotated at a constant rate.
  • the l00-slide gear 62 is provided with 150 teeth of conventional construction, the spaces or valleys between the teeth .being of the same size and shape (but oppositely disposed) as the teeth themselves.
  • the gear 74 has the same outside diameter as the gear 62.
  • the gear 74 according to the embodiment shown herein is provided with 120 teeth 75. In forming these teeth, the depth of the cut was 0.65
  • the present invention is not limited to accommodating slide trays wherein one tray contains slide-receiving spaces and the other tray contains 80 slidereceiving spaces. It will be appreciated the embodiment of the invention disclosed herein can be readily adapted to accommodate two forms of slide trays having slide-receiving spaces differing in number from each other and being other than 80 or 100, so long as the difference in slide-receiving spaces between the trays is not unduly large with respect to the total number of spaces in the trays.
  • the slide tray 198 may be stepped in either direction one space at a time by actuation of the advance and reverse" buttons 21, 22.
  • Actuation of the button 21, for example, will cause the disk 28 to be rotated in the proper direction by reason of the engagement between the fingers 140, 141 (FIG. 14) engaging the detent formations 46, 47. This will result in the appropriate contact strips 49, 50 being brought into engagement with the seeking contact which is connected in the circuit.
  • This actuation of the button 21 will close the contacts 146, thereby establishing a circuit as explained above for rotating the tray a distance represented by one space therein.
  • Actuation of the button 22 will result in the other contacts 49, 50 being brought into engagement with the operative seeking-contact resulting in rotation of the tray in the other direction.
  • the detent formations are dimensioned such thatthe formations 46 and 47 engaged by a detent ball will be detented through an arcuate increment which will result in the tray being rotated one increment defined by one slide-receiving space.
  • the buttons 21, 22 may be successively operated for sequentially projecting the slides in the tray.
  • the drive motor 162 is shunted by both switches 257, 259. Accordingly, the drive motor cannot be energized until after energization of both the relay 231 and the relay 232.
  • the latter relay is not energized until the slidechanging mechanism in the slide projector has proceeded through a half cycle for returning a slide to its space in the tray. Accordingly, this feature prevents the slide tray from being rotated prior to the time the slide is returned to its space in the tray.
  • this double-shunt arrangement for the drive motor 162 causes the latter to be dynamically braked as soon as the relay 231 is deenergized. This causes the tray to be positively stopped when the selected slide-receiving space is positioned adjacent the projection gate. As just mentioned above, the relay 232, which controls the switch 259, is not deenergized until a slide is returned to the projection gate.
  • the slide projector 14 may still be operated without removing the unit 12 from the projector.
  • the button 199 is lifted for disengaging the drive gear 196 from the teeth 197 on the slide tray. This action also releases the disabling switch mentioned above thereby placing the deenergized projector drive system into operation.
  • the load button 264 on the projector may be operated by actuation of a button 2240 (FIG. 1) which is mounted on top of the pin 224.
  • the present invention is not to be limited for use with the particular slide projector disclosed in the above-mentioned Hall application.
  • the Hall application may be relied upon for a complete understanding of the present invention, the disclosure in the aforementioned Hall is incorporated herein by this reference thereto.
  • the attachment unit 12 formed as an integral part of an associated slide projector.
  • the motor 162 can serve as the sole drive motor for the tray rotating the latter upon operation of the random selection system and also rotating the tray when the normal tray-indexing or advance mechanism is used.
  • the present invention permits the control unit to be remotely disposed with respect to the projector and connected thereto by a cable having a minimum number of conductors.
  • the extension cable in the embodiment according to-the present invention, only eight conductors are contained within the extension cable and therefore a standard eight-conductor cable can be used.
  • This important feature results from the nature of the stepping motor with its remote commutator which requires, in the embodiment shown, only three wires for connecting the commutator to the rotor.
  • the unique stepping motor with this remote commutator maintains precise synchronization between rotation of the slide tray and the seeking contacts for precisely locating any randomly selected slide space at the slide projection gate of the projector.
  • a control unit separate and remote from said projector comprising a motor, a seeking contact driven in an arcuate path by said motor, contact means defined by two separate segments arranged in an arcuate path for alternate engagement by said seeking contact; and manually operable selection means associated with said contact means for establishing the extent of movement of said seeking contact to effect a predetermined circuit condition;
  • a commutator mounted on said projector and having the rotatable component thereof driven by said motor-driven indexing means;
  • said motor-driven indexing means including a reversible motor
  • circuit means connecting the seeking contact and the segments of said contact means with the reversible motor for establishing either forward or reverse signals for each selected circuit condition, depending on which of said segments is engaged by said seeking contact to alternately energize the reversible motor in forward and reverse directions.
  • a. drive means including a drive motor for indexing the slide tray
  • a DC stepping motor having a remote commutator, which commutator includes a rotary element driven by said drive means;
  • nonconductive support means mounting an arcuate contact strip arranged to be wiped by said seeking contact and defining a dielectric area adjacent one end of said strip;
  • control means for selecting a number corresponding to the selected space in the tray including means for positioning said contact strip with respect to said seeking contact to establish an initial spatial relationship between the former and the latter; and circuit means including the drive motor, the seeking contact and the contact strip for establishing a first contact condition when said seeking contact wipes said strip and a second circuit condition when said seeking contact reaches said dielectric area, said first circuit condition causing the drive motor to be energized and said second circuit condition causing the drive motor to be deenergized.
  • the random slide selection means according to claim 2 further defined by:
  • said circuit means including rectifying means providing said first strip with positive and said another strip with negative DC voltage;
  • said circuit means also including said another strip for alternately energizing said drive motor in forward and reverse directions depending on whether said first strip or said second strip is being wiped by said seeking contact.
  • the random slide selection means according to claim 2 further defined by:
  • selector means for alternately placing said seeking contacts in said circuit means whereby said random slide selection means may accommodate another slide tray having a number of slide-receiving spaces different from the number of slide-receiving spaces in the first mentioned tray.
  • a system for presenting at said gate any one of said spaces selected at random comprising:
  • a commutator-transmitter including a rotatable element and means for mechanically rotating the latter by said drive motor in synchronization with the indexing movement ofsaid tray;
  • motor means remotely associated with said commutatortransmitter and including a rotor which is rotated in synchronization with said rotatable element in response to signals generated by the commutator-transmitter as a result of rotation of the rotatable element;
  • selector contact means having support means mounting first and second contact strips with adjacent ends thereof in spaced relation and defining a dielectric area therebetween, said contact strips being arranged in an arcuate path for wiping engagement by said seeking contact;
  • slide selection means associated with said selector contact means and operable to establish the extent of movement of said seeking contact which is necessary to effect a first contact condition, a second contact condition being effected during movement of said seeking contact;
  • a system for presenting at said gate any one of said spaces selected at random comprising:
  • a three-bar commutator-transmitter including a rotatable element
  • a multiconductor extension cable including three conductors connected to said commutator-transmitter;
  • a random selection control unit 'remote from said projector and including:
  • motor means connected to said three conductors and including a rotor adapted to be rotated in synchronization with said rotatable element in response to signals generated by the commutator-transmitter as a result of rotation of the rotatable element
  • selector means having support means mounting first and second contact strips with adjacent ends thereof in space relation and defining a dielectric area therebetween, said contact strips being arranged in an arcuate path for wiping engagement by said seeking contact,
  • slide selection means associated with said selector contact means and operable to establish the extent of movement of said seeking contact which is necessary to effect a first contact condition when said seeking contact engages the dielectric area, a second contact condition being effected during movement of said seeking contact;
  • circuit means connecting said drive motor, said seeking contact and said selector contact means via an extension cable and adapted to cause deenergization and energization of said drive motor upon occurrence of said first and second contact conditions respectively, said circuit means including rectifying means providing said first and second contact strips with positive and negative DC voltage, respectively, during the occurrence of the second contact condition to alternately rotatethe drive motor in forward and reverse directions depending on whether said first or second strip is being wiped by said seeking contact.
  • said circuit means including a random selection initiate switch" and a single-slide initiate switch,” which switches are connected in parallel and are of the normally open type;
  • stepping means adapted to engage said disk and operated by each of said actuators for stepping said disk in advance and reverse directions in response to actuation of said advance actuator and said reverse actuator, respectively.
  • a second seeking contact mounted for being driven by said rotor in an arcuate path for alternate wiping engagement with said contact strips at an angular rate of movement different from the rate of movement of said firstmentioned seeking contact;
  • selector switch means for alternately placing said first and second seeking contacts in said circuit means thereby adapting said projector to accommodate another tray having a number of slide-receiving spaces different from the number of slide-receiving spaces in said first-mentioned tray.
  • said indicator means including first and second numerical indicia means corresponding respectively to the number of slide-receiving spaces in said first'mentioned tray and said second-mentioned tray;
  • masking means shiftably mounted for alternately obsecuring at least a portion of saidfirst and second indicia number of conductors in said extension cable is not in excess of eight
  • a system for presenting at said gate any one of said spaces selected at random comprising:
  • drive means including a reversible drive motor for alternately indexing the tray in advance and reverse directions;
  • a rotatably mounted disk having first and second arcuate contact strips thereon with ends of the strips being in spaced relation and adjacent a dielectric area;
  • a seeking contact mounted for being driven by said rotor in an arcuate path for alternate wiping engagement with said strips;
  • circuit means connecting said reversible drive motor, said strips and said seeking contact, which circuit means includes rectifying means providing said first and second strips with positive and negative DC voltage, respectively, the circuit means being adapted alternately to energize said drive motor in forward and reverse directions as determined by whether said first strip or said second strip selected at random comprising:
  • indexing means including a reversible electric motor and an indexing member driven thereby, which number is engageable with a slide tray for indexing the latter in forward and reverse directions in response to forward and reverse directions in response to forward and reverse energization of said motor, respectively;
  • circuit means connected with said motor and including selector means for one-at-a-time selection of numbers corresponding to the spaces in the associated slide tray;
  • said selector means including relatively movable contacts for establishing a discreet spatial relationship of such contacts for each number selected by the selector means and for establishing forward or reverse signals for each of said contact relationships to alternately energize said motor in forward and reverse directions which results in the minimum amount of movement of said indexing member 6 5 to present the selected tray space at said gate.
  • said relatively movable contacts include a pair of arcuate contacts movable in response to operation of said selection means and a seeking contact driven in synchronization with said indexing means and arranged for one-at-a-time wiping engagement of said arcuate contacts, said circuit means providing said arcuate contacts with respective plus and minus polarity.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Switches With Compound Operations (AREA)
US739353A 1968-06-24 1968-06-24 Random selection system for a slide projector Expired - Lifetime US3644027A (en)

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US73935368A 1968-06-24 1968-06-24

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BE (1) BE735007A (US08088816-20120103-C00036.png)
BR (1) BR6909966D0 (US08088816-20120103-C00036.png)
CH (1) CH512081A (US08088816-20120103-C00036.png)
DE (2) DE6923748U (US08088816-20120103-C00036.png)
FR (1) FR2011573A1 (US08088816-20120103-C00036.png)
GB (1) GB1265902A (US08088816-20120103-C00036.png)
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US3924942A (en) * 1973-05-08 1975-12-09 Canon Kk Film projection system having attachment device capable of switching different selected modes of projection
WO1992012458A1 (en) * 1990-12-27 1992-07-23 Eastman Kodak Company Random access module for slide projector
US6202148B1 (en) * 1997-10-31 2001-03-13 Integrated Silicon Systems Limited Commutator circuit
US20090309828A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for transmitting instructions associated with user parameter responsive projection
US20090310089A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods for receiving information associated with projecting
US20090310035A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for receiving and transmitting signals associated with projection
US20090310101A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Projection associated methods and systems
US20090310104A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for coordinated use of two or more user responsive projectors
US20090310103A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for receiving information associated with the coordinated use of two or more user responsive projectors
US20090313153A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware. Systems associated with projection system billing
US20090310098A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for projecting in response to conformation
US20090310038A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Projection in response to position
US20090310088A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods for projecting
US20090310093A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods for projecting in response to conformation
US20090310097A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Projection in response to conformation
US20090310039A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for user parameter responsive projection
US20090309718A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods associated with projecting in response to conformation
US20090312854A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for transmitting information associated with the coordinated use of two or more user responsive projectors
US20090313152A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems associated with projection billing
US20090310095A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods associated with projecting in response to conformation
US20090324138A1 (en) * 2008-06-17 2009-12-31 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems related to an image capture projection surface
US20100066689A1 (en) * 2008-06-17 2010-03-18 Jung Edward K Y Devices related to projection input surfaces
US20100066983A1 (en) * 2008-06-17 2010-03-18 Jun Edward K Y Methods and systems related to a projection surface
US20110176119A1 (en) * 2008-06-17 2011-07-21 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for projecting in response to conformation

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US3296727A (en) * 1964-10-09 1967-01-10 Decision Systems Inc Random access projector

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US1292768A (en) * 1914-06-11 1919-01-28 Frederic Auguste Henri Harle Control apparatus.
US3296727A (en) * 1964-10-09 1967-01-10 Decision Systems Inc Random access projector

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924942A (en) * 1973-05-08 1975-12-09 Canon Kk Film projection system having attachment device capable of switching different selected modes of projection
WO1992012458A1 (en) * 1990-12-27 1992-07-23 Eastman Kodak Company Random access module for slide projector
US6202148B1 (en) * 1997-10-31 2001-03-13 Integrated Silicon Systems Limited Commutator circuit
US20090309828A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for transmitting instructions associated with user parameter responsive projection
US20090310089A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods for receiving information associated with projecting
US20090310035A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for receiving and transmitting signals associated with projection
US20090310101A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Projection associated methods and systems
US20090310104A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for coordinated use of two or more user responsive projectors
US20090310103A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for receiving information associated with the coordinated use of two or more user responsive projectors
US20090313153A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware. Systems associated with projection system billing
US20090310098A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for projecting in response to conformation
US20090310040A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for receiving instructions associated with user parameter responsive projection
US20090310038A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Projection in response to position
US20090310088A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods for projecting
US20090310036A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for projecting in response to position
US20090310093A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods for projecting in response to conformation
US20090310097A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Projection in response to conformation
US20090310037A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for projecting in response to position
US20090310039A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods and systems for user parameter responsive projection
US20090309718A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods associated with projecting in response to conformation
US20090310094A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Systems and methods for projecting in response to position
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US20090313150A1 (en) * 2008-06-17 2009-12-17 Searete Llc, A Limited Liability Corporation Of The State Of Delaware Methods associated with projection billing
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US20100066689A1 (en) * 2008-06-17 2010-03-18 Jung Edward K Y Devices related to projection input surfaces
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US8857999B2 (en) 2008-06-17 2014-10-14 The Invention Science Fund I, Llc Projection in response to conformation
US8936367B2 (en) 2008-06-17 2015-01-20 The Invention Science Fund I, Llc Systems and methods associated with projecting in response to conformation
US8939586B2 (en) 2008-06-17 2015-01-27 The Invention Science Fund I, Llc Systems and methods for projecting in response to position
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Also Published As

Publication number Publication date
BE735007A (US08088816-20120103-C00036.png) 1969-12-01
CH512081A (de) 1971-08-31
NL6909451A (US08088816-20120103-C00036.png) 1969-12-30
FR2011573A1 (US08088816-20120103-C00036.png) 1970-03-06
DE6923748U (de) 1969-11-27
BR6909966D0 (pt) 1973-01-11
DE1930252B1 (de) 1970-08-20
GB1265902A (US08088816-20120103-C00036.png) 1972-03-08
SE355869B (US08088816-20120103-C00036.png) 1973-05-07

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