US3576362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic apparatus
Assignee: Agfa Gevaert AG
•
Filing: 1969-01-23
•
Granted: 1971-04-27
•
Expires: 1989-01-23
Abstract
Abstract The circuit of the electric motor in a motion picture camera is completed by an electromagnet whose armature arrests the shutter in a predetermined angular position when the motor is arrested. The electromagnet is energized by a capacitor, either directly or by way of a transistor. The circuit of the capacitor is completed by a main switch or by a trigger switch which latter is installed in the camera body and is actuated by a Bowden wire.
Inventors
- 👤 Helmut Mayr
- 👤 Richard Pelte
- 👤 Theodor Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:27
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
222 words
In a photographic apparatus, a combination comprising electric motor means; normally open control switch means in circuit with said motor means; a driven member receiving motion from said motor means; electromagnetic actuating means energizable to thereby complete the circuit of said motor means, said actuating means including an armature movable to a first position in response to energization of said actuating means to thereby close said control switch means and a second position in response to deenergization of said actuating means to thereby effect stoppage of said driven member in a predetermined position; blocking means comprising a blocking member provided on said armature and extending into the path of movement of said driven member in the second position of said armature, and biasing means yieldably engaging said blocking member so that the latter yields temporarily on engagement with said driven member; energizing means including capacitor means and a source of current for supplying transient initial energizing current and a steady state current respectively to said actuating means; first resistor means for regulating the steady state strength of the current supplied by said source of current to said actuating means so that the actuating means is energizable for longer or shorter intervals of time; and second resistor means Connected in parallel with said motor means in response to deenergization of said actuating means.
Claim 2
Dependent Claim
222 words
In a photographic apparatus, a combination comprising electric motor means; normally open control switch means in circuit with said motor means; a driven member receiving motion from said motor means; electromagnetic actuating means energizable to thereby complete the circuit of said motor means, said actuating means including an armature movable to a first position in response to energization of said actuating means to thereby close said control switch means and a second position in response to deenergization of said actuating means to thereby effect stoppage of said driven member in a predetermined position; blocking means comprising a blocking member provided on said armature and extending into the path of movement of said driven member in the second position of said armature, and biasing means yieldably engaging said blocking member so that the latter yields temporarily on engagement with said driven member; energizing means including capacitor means and a source of current for supplying transient initial energizing current and a steady state current respectively to said actuating means; first resistor means for regulating the steady state strength of the current supplied by said source of current to said actuating means so that the actuating means is energizable for longer or shorter intervals of time; and second resistor means Connected in parallel with said motor means in response to deenergization of said actuating means.
Claim 3
Dependent Claim
15 words
A combination as defined in claim 1 wherein said driven member is a rotary shutter.
Claim 4
Dependent Claim
30 words
A combination as defined in claim 2, wherein said shutter is provided with an opening which accommodates a portion of said blocking member in deenergized condition of said actuating means.
Claim 5
Dependent Claim
53 words
A combination as defined in claim 1, wherein said control switch means comprises a movable contact, a second contact which is engaged by said movable contact in response to energization of said actuating means, and a third contact which is engaged by said movable contact in response to deenergization of said actuating means.
Claim 6
Dependent Claim
74 words
A combination as defined in claim 1, wherein said control switch means comprises a movable contact, a second contact which is engaged by said movable contact in response to energization of said actuating means to thereby complete the circuit of said motor means, and a third contact which is engaged by said movable contact and thereby connects said resistor means in parallel with said motor means in response to deenergization of said actuating means.
Claim 7
Dependent Claim
67 words
A combination as defined in claim 1, wherein said capacitor means is in parallel with said actuating means and further comprising selector means movable between a plurality of positions and a source of electrical energy, said selector means being arranged to connect said source with said capacitor means and said actuating means by way of said first resistor means in at least one of said positions thereof.
Claim 8
Dependent Claim
58 words
A combination as defined in claim 6, wherein said first resistor means comprises a pair of resistors which are connected in parallel to each other and are connected with said capacitor means in a first position of said selector means, one of said resistors being connected with said capacitor means in a second position of said selector means.
Claim 9
Dependent Claim
63 words
A combination as defined in claim 7, wherein the resistances of said resistors are such that said capacitor means can supply current which maintains the actuating means in energized condition in the first position of said selector means and that said capacitor means can supply current which suffices for short-lasting energization of said actuating means in the second position of said selector means.
Claim 10
Dependent Claim
28 words
A combination as defined in claim 8, wherein said actuating means is energized only during discharge of said capacitor means in the second position of said selector means.
Claim 11
Dependent Claim
33 words
A combination as defined in claim 1, further comprising main switch means and means for closing said main switch means to thereby complete the circuit of said capacitor means and said actuating means.
Claim 12
Dependent Claim
20 words
A combination as defined in claim 10, wherein the means for closing said main switch means comprises a camera trigger.
Claim 13
Dependent Claim
18 words
A combination as defined in claim 1, further comprising electric amplifier means in circuit with said actuating means.
Claim 14
Dependent Claim
14 words
A combination as defined in claim 12, wherein said amplifier means comprises transistor means.
Claim 15
Dependent Claim
22 words
A combination as defined in claim 1, wherein said armature comprises a lever which is pivotable between said first and second positions.
Claim 16
Dependent Claim
119 words
In a photographic apparatus, a combination comprising electric motor means; normally open control switch means in circuit with said motor means; electromagnetic actuating means energizable to thereby close said control switch means; a rotary member driven by said motor means; blocking means responsive to deenergization of said actuating means to arrest said rotary member in a predetermined angular position; energizing means for supplying energizing current to said actuating means, said energizing means including capacitor means; electric amplifier means in circuit with said actuating means, said amplifier means comprising transistor means and said actuating means being connected in the collector circuit of said transistor means; and means for connecting sAid capacitor means in the base-emitter circuit of said transistor means.
Claim 17
Dependent Claim
119 words
In a photographic apparatus, a combination comprising electric motor means; normally open control switch means in circuit with said motor means; electromagnetic actuating means energizable to thereby close said control switch means; a rotary member driven by said motor means; blocking means responsive to deenergization of said actuating means to arrest said rotary member in a predetermined angular position; energizing means for supplying energizing current to said actuating means, said energizing means including capacitor means; electric amplifier means in circuit with said actuating means, said amplifier means comprising transistor means and said actuating means being connected in the collector circuit of said transistor means; and means for connecting sAid capacitor means in the base-emitter circuit of said transistor means.
Claim 18
Dependent Claim
26 words
A combination as defined in claim 15, wherein the means for connecting said capacitor means comprises a main switch and means for closing said main switch.
Claim 19
Dependent Claim
39 words
A combination as defined in claim 15, individual comprising a pair of resistors connected in parallel with each other and selector means for connecting at least one of said resistors between the base and emitter of said transistor means.
Claim 20
Dependent Claim
47 words
A combination as defined in claim 17, wherein said selector means is movable between a first position in which only one of said resistors is in circuit with said transistor means and a second position in which both said resistors are in circuit with said transistor means.
Claim 21
Dependent Claim
49 words
A combination as defined in claim 18, further comprising an additional resistor which constitutes a first voltage divider with said one resistor in the first position of said selector means and a second voltage divider with both said first mentioned resistors in the second position of said selector means.
Claim 22
Dependent Claim
28 words
A combination as defined in claim 19, wherein said voltage dividers are connected with the base of said transistor means in the respective positions of said selector means.
Claim 23
Dependent Claim
69 words
A combination as defined in claim 20, wherein the base potential of said transistor means in the first position of said selector means is such that the strength of collector current suffices to maintain said actuating means in energized condition, said base potential in the second position of said selector means being such that the collector current is weaker than necessary to maintain said actuating means in energized condition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |