US3782819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microfilm driving device for microfiche camera
Assignee: Canon Inc
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Filing: 1973-03-07
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Granted: 1974-01-01
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Expires: 1993-03-07
Abstract
Abstract A film driving device for microfiche camera employs stepping motors for driving a microfilm and a microfilm carrier. Each of the stepping motors is numerically controlled by a variable pulse oscillator. The variable pulse oscillator comprises an oscillator circuit and a time constant circuit for changing a oscillation frequency of the oscillator circuit. The oscillator circuit adapts to rapidly increase the frequency of the clock pulses to be applied to the stepping motors in response to the variation in the time constant of the time constant circuit to vary the feeding speeds of the microfilm and the microfilm carrier.
Inventors
- 👤 M Kanayama
- 👤 T Toda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:53
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/58; G03B27/583
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A film driving device for a microfiche camera comprising a. stepping motors for driving a microfilm and a microfilm carrier, respectively, and b. a variable pulse oscillator for numerically controlling each of said stepping motors in response to a drive command signal, said variable pulse oscillator comprising a switching circuit, a time constant circuit adapted to change its time constant in response to the actuation of said switching circuit, and an oscillator circuit adapted to rapidly increase the frequency of the clock pulses to a predetermined frequency in response to the variation in the time constant of said time constant circuit.
Claim 2
Dependent Claim
101 words
A film driving device for a microfiche camera comprising a. stepping motors for driving a microfilm and a microfilm carrier, respectively, and b. a variable pulse oscillator for numerically controlling each of said stepping motors in response to a drive command signal, said variable pulse oscillator comprising a switching circuit, a time constant circuit adapted to change its time constant in response to the actuation of said switching circuit, and an oscillator circuit adapted to rapidly increase the frequency of the clock pulses to a predetermined frequency in response to the variation in the time constant of said time constant circuit.
Claim 3
Dependent Claim
64 words
A driving device for a microfiche camera as defined in claim 1 wherein said microfilm carrier is provided with a pair of feed rollers for the microfilm, one of said pair of feed rollers is slidably fitted over a rotary member having a spline groove, and said rotary member is drivingly coupled to said stepping motor disposed externally and independently of said microfilm carrier.
Claim 4
Dependent Claim
189 words
A driving device for a microfiche camera as defined in claim 1 comprising a. a flip-flop adapted to be set when a drive commande signal and a timing pulse are simultaneously applied to an AND gate output of which is connected to input of said flip-flop, b. variable pulse oscillator means adapted to continuously increase the frequency of the clock pulses generated by said oscillator circuit to a predetermined frequency by decreasing a time constant of said time constant circuit in response to the actuation of said switching circuit which in turn is actuated in response to the set output of said flip-flop, c. a pulse counter for counting the output pulses generated by said variable pulse oscillator, d. end pulse generating means for generating the end pulse in response to the output of said pulse counter and in synchronism with a timing pulse, thereby resetting said flip-flop, e. stepping motor control circuit means for controlling stepping motor in response to the input to said pulse counter, and f. timing pulse generating means for generating the timing pulses in response to the output of said variable pulse oscillator means.
References Cited (Backward Citations)
US3627413A
Cited
US3672769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |