US3706844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film format and stop circuit for an electronic video recording player
Assignee: Motorola Solutions Inc
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Filing: 1971-03-15
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Granted: 1972-12-19
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Expires: 1991-03-15
Abstract
Abstract An electronic video recording player is disclosed for converting images on a film into a composite video signal for application to a television receiver to be reproduced therein. To prevent damage to the film cartridge by tearing the film loose from the cartridge when the end of the film is reached, the film is provided with a sequence of clear and opaque portions in the synchronizing signal track thereof. The player includes a timing circuit coupled with a light responsive resistor to operate a film device stop solenoid when the film end sequence is sensed. If an attempt is made to restart the forward drive of the film in any forward mode following an automatic stop at the end of the film, the sequence of opaque and clear portions at the end of the film causes reoperation of the stop solenoid. A time delay circuit operates to prevent false operation of the stop solenoid when the film leader is first threaded through the player. Clear portions also may be inserted in the synchronizing track of the film between different program materials on the film. These clear portions are long enough to cause energization of the stop solenoid when the player is being operated in a play mode but are too short to cause energization of the stop solenoid when the player is being operated in fast-forward mode of operation.
Inventors
- 👤 Emil E Besier
- 👤 Warren L Knauer Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:08
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/84
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
194 words
For use in an electronic video recording system, a film having a leader portion, information portion, and an end portion, with the information portion having a synchronizing track including synchronizing window sections of a first predetermined length and having a first predetermined detectable characteristic alternating with sections of a second predetermined length and having a second predetermined detectable characteristic, the end portion of said film having a synchronizing track region aligned with the synchronizing track of the information portion and the end portion of said film comprising: a third predetermined length of film having one end attached to the end of the information portion of said film and having said first predetermined detectable characteristic throughout the length of the synchronizing track region therein, said third predetermined length being substantially longer than said first and second predetermine lengths; a fourth predetermined length of film attached to the other end of said first predetermined length and including in the synchronizing track region thereof portions of film having said second detectable characteristic alternating with portions of film having said first detectable characteristic, each of said alternating portions having a length substantially greater than said first predetermined length.
Claim 2
Dependent Claim
194 words
For use in an electronic video recording system, a film having a leader portion, information portion, and an end portion, with the information portion having a synchronizing track including synchronizing window sections of a first predetermined length and having a first predetermined detectable characteristic alternating with sections of a second predetermined length and having a second predetermined detectable characteristic, the end portion of said film having a synchronizing track region aligned with the synchronizing track of the information portion and the end portion of said film comprising: a third predetermined length of film having one end attached to the end of the information portion of said film and having said first predetermined detectable characteristic throughout the length of the synchronizing track region therein, said third predetermined length being substantially longer than said first and second predetermine lengths; a fourth predetermined length of film attached to the other end of said first predetermined length and including in the synchronizing track region thereof portions of film having said second detectable characteristic alternating with portions of film having said first detectable characteristic, each of said alternating portions having a length substantially greater than said first predetermined length.
Claim 3
Dependent Claim
50 words
The combination according to claim 1 wherein said third predetermined length is more than an order of magnitude greater than said first predetermined length of each of said alternating portions of said fourth predetermined length of film is at least an order of magnitude greater than said first predetermined length.
Claim 4
Dependent Claim
85 words
The combination according to claim 1 wherein the information portion of said film is divided into at least two sections, with said sections of said information portion being separated by a separating portion of film, at least the synchronizing track region of which has said first predetermined detectable characteristic, said separating portion of film having a fifth predetermined length at least an order of magnitude greater than said first predetermined length and approximately an order of magnitude less the said third predetermined length of film.
Claim 5
Dependent Claim
44 words
The combination according to claim 2 wherein said first and second predetermined detectable characteristics are optically detectable characteristics, one of which is provided by a transparent area of said film and the other of which is provided by an opaque area of said film.
Claim 6
Dependent Claim
176 words
In an electronic video recording player for converting images recorded on film into electrical signals fro reproduction by a television receiver, the film having a leader portion, an information portion, and an end portion with a synchronizing track region extending the length thereof, the leader and end portions of said film having first and second predetermined lengths, respectively, with the synchronizing window sections having a third predetermined length substantially less than said first and second predetermined lengths and having a first predetermined detectable characteristic separated by sections having a fourth predetermined length less than said first and second predetermined lengths and having a second predetermined detectable characteristic, with the end portion of the film including a first section adjacent the information portion and having said first detectable characteristic throughout the length of said synchronizing .rack region, said first section followed by a predetermined numbEr of additional sections having said second predetermined detectable characteristic alternating with additional sections having said first predetermined detectable characteristic in the synchronizing track region thereof, the player including means for detecting the
Claim 7
Dependent Claim
176 words
In an electronic video recording player for converting images recorded on film into electrical signals fro reproduction by a television receiver, the film having a leader portion, an information portion, and an end portion with a synchronizing track region extending the length thereof, the leader and end portions of said film having first and second predetermined lengths, respectively, with the synchronizing window sections having a third predetermined length substantially less than said first and second predetermined lengths and having a first predetermined detectable characteristic separated by sections having a fourth predetermined length less than said first and second predetermined lengths and having a second predetermined detectable characteristic, with the end portion of the film including a first section adjacent the information portion and having said first detectable characteristic throughout the length of said synchronizing .rack region, said first section followed by a predetermined numbEr of additional sections having said second predetermined detectable characteristic alternating with additional sections having said first predetermined detectable characteristic in the synchronizing track region thereof, the player including means for detecting the
Claim 8
Dependent Claim
144 words
The combination according to claim 5 wherein said control means includes a solenoid, the operation of which disables said drive means, said solenoid having a normally nonenergized operating coil with first and second ends; first and second voltage supply terminals for connection across a DC supply; film responsive switch means connected between said first voltage supply terminal and the first end of said operating coil; and electronic switch means connected in series between said second voltage supply terminal and the second end of said operating coil;, said film responsive switch means being closed in response to the presence of film in said player; said electronic switch means being normally nonconductive and being rendered conductive in response to said stop input signal to thereby complete an energizing path through said operating coil causing energization thereof to operate said solenoid, whereupon said drive means is disabled.
Claim 9
Dependent Claim
106 words
The combination according to claim 6 wherein the first circuit means includes a transistor having first, second, and control electrodes, with the first and second electrodes thereof being connected in series circuit between said first and second voltage supply terminals, said first electrode providing an output signal at said first level with said transistor rendered conductive and providing an output signal at said second level with said transistor being rendered nonconductive, said detecting means being coupled with the control electrode of said transistor to cause said transistor to be rendered nonconductive with said detecting means detecting a section of said film having said fit detectable characteristic.
Claim 10
Dependent Claim
170 words
The combination according to claim 6 wherein said first voltage supply terminal is coupled with a source of DC operating potential and said second voltage supply terminal is connected to a point of reference potential, and further wherein said delay circuit means includes an RC time delay circuit connected between said point of reference potential and said film responsive switch means and providing a predetermined time delay corresponding to the time interval required to thread said leader portion of said film through said player upon initiation of operation of said player; and third circuit means coupling said RC delay circuit with said second interval timer means for causing said second predetermined time interval to be less than said first predetermined time interval for a period of time determined by time delay of said RC time delay circuit, said time delay being selected to substantially equal to the length of time required for said leader portion of said film to pass said detecting means upon initiation of operation of said player.
Claim 11
Dependent Claim
190 words
The combination according to claim 8 wherein said first and second detectable characteristics of said film are first and second different light transmitting characteristics, the player including a source of light directed on said synchronizing track; the first circuit means includes a transistor having collector, base, and emitter electrodes, with said collector connected through a collector load impedance to said first supply terminal and also connected to the input of said first interval timer means; said detecting means includes a light dependent resistor connected between said point of reference potential and a first junction and located to respond to light directed on said synchronizing track; said second interval timer means includes a first capacitor;, connected between said first junction and the base of said transistor and resistance means connected between the base of said transistor and said first supply terminal; and said RC time delay circuit includes first and second Resistors connected together at a second junction and connected in series in the order named between said film responsive switch means and said first junction and a second capacitor connected between said point of reference potential and said second junction.
Claim 12
Dependent Claim
99 words
The combination according to claim 9 wherein said electronic switch means comprises a second transistor having base, collector, and emitter electrodes, with the collector-emitter path connected in series between the first end of said operating coil and said point of reference potential, said second transistor normally being non conductive and being rendered conductive in response to said stop input signal from said first interval timer means to complete an energizing circuit for said operating coil from said first supply terminal through said film responsive switch means said operating coil, and said second transistor to said point of reference potential.
References Cited (Backward Citations)
US2514578A
Cited
US3609228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |