US4697899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motorized drive device for camera
Assignee: Canon Inc
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Filing: 1986-09-29
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Granted: 1987-10-06
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Expires: 2006-09-29
Abstract
Abstract A motorized drive device for a camera having a motor and a transmission system. The deceleration control of the motor is started when an object being driven arrives at a short distance from a prescribed stop position. The detection of a fall of the speed of the object to an abnormal low value is carried out during the deceleration control period and its preceding motor drive period by respective different processes from each other.
Inventors
- 👤 Masaharu Kawamura
- 👤 Yoshihito Harada
- 👤 Ryuichi Kobayashi
- 👤 Masayuki Suzuki
- 👤 Tsunemasa Ohara
- 👤 Yoichi Tosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
163 words
A motorized drive device for a camera comprising: (a) a motor as a rotation drive source; (b) a transmission system to be driven by said motor; (c) a camera mechanism to be driven by the output of said transmission system; (d) control means for controlling the rotation of said motor by current supply, said control means controlling the current supply in such a manner that said motor rotates at least at a first speed and a second speed which is slower than said first speed; and (e) low speed abnormal detecting means for detecting a state that the speed of rotation of said motor is slower than a prescribed reference speed, said detecting means having set therein a first reference speed when the current supply is controlled to said first speed of rotation, and a second reference speed when the current supply is controlled to said second speed of rotation, and said first reference speed being made faster than said second reference speed.
Claim 2
Dependent Claim
163 words
A motorized drive device for a camera comprising: (a) a motor as a rotation drive source; (b) a transmission system to be driven by said motor; (c) a camera mechanism to be driven by the output of said transmission system; (d) control means for controlling the rotation of said motor by current supply, said control means controlling the current supply in such a manner that said motor rotates at least at a first speed and a second speed which is slower than said first speed; and (e) low speed abnormal detecting means for detecting a state that the speed of rotation of said motor is slower than a prescribed reference speed, said detecting means having set therein a first reference speed when the current supply is controlled to said first speed of rotation, and a second reference speed when the current supply is controlled to said second speed of rotation, and said first reference speed being made faster than said second reference speed.
Claim 3
Dependent Claim
18 words
A camera according to claim 1, wherein as said camera mechanism, an advancing structure for film is used.
Claim 4
Dependent Claim
40 words
A camera according to claim 1, wherein said control means achieves said first speed rotation by giving a continuous current supply to said motor, and achieves said second speed of rotation by giving duty pulses (intermittent pulses) to said motor.
Claim 5
Dependent Claim
51 words
A camera according to claim 1, wherein said low speed abnormal detecting means detects the low speed abnormal state when the time an object to be driven by the rotation of said motor takes to move from a first position to a second position is longer than a preset reference time.
Claim 6
Dependent Claim
66 words
A camera according to claim 2, wherein said low speed abnormal detecting means includes pulse generating means for producing a pulse signal representing the amount of movement of the film advanced by said advancing structure, and the state that the speed of rotation of said motor is slower than said reference speed is detected when said pulse signal is not produced within a preset prescribed time.
Claim 7
Dependent Claim
40 words
A camera according to claim 2, wherein said control means controls the current supply for one-frame winding-up advance of the film in such a manner that said motor first rotates at said first speed and then at said second speed.
Claim 8
Dependent Claim
167 words
A motorized drive device for a camera comprising: (a) a motor as a rotation drive source; (b) a transmission system to be driven by said motor, said transmission system having set therein at least a high speed transmission system having a small speed reduction ratio and a low speed transmission system having a large speed reduction ratio; (c) a camera mechanism to be driven by the output of said transmission system; (d) control means for changing over between the speed reduction ratios of said transmission system; and (e) low speed abnormal detecting means for detecting a state that the speed of rotation of said motor is slower than a preset reference speed, said detecting means having set therein a first reference speed when said transmission system is set in said high speed transmission system by said control means, and a second reference speed when said transmission system is set in said low speed transmission system, said first reference speed being made faster than said second reference speed.
Claim 9
Dependent Claim
167 words
A motorized drive device for a camera comprising: (a) a motor as a rotation drive source; (b) a transmission system to be driven by said motor, said transmission system having set therein at least a high speed transmission system having a small speed reduction ratio and a low speed transmission system having a large speed reduction ratio; (c) a camera mechanism to be driven by the output of said transmission system; (d) control means for changing over between the speed reduction ratios of said transmission system; and (e) low speed abnormal detecting means for detecting a state that the speed of rotation of said motor is slower than a preset reference speed, said detecting means having set therein a first reference speed when said transmission system is set in said high speed transmission system by said control means, and a second reference speed when said transmission system is set in said low speed transmission system, said first reference speed being made faster than said second reference speed.
Claim 10
Dependent Claim
38 words
A camera according to claim 7, wherein the changeover of the speed reduction ratio of said transmission system uses a planetary clutch whose output connection is selected by the change of the direction of rotation of said motor.
Claim 11
Dependent Claim
18 words
A camera according to claim 7, wherein as said camera mechanism, an advancing structure for film is used.
Claim 12
Dependent Claim
51 words
A camera according to claim 7, wherein said low speed abnormal detecting means detects the low speed abnormal state when the time an object to be driven by the rotation of said motor takes to move from a first position to a second position is longer than a preset reference time.
Claim 13
Dependent Claim
66 words
A camera according to claim 9, wherein said low speed abnormal detecting means includes pulse generating means for producing a pulse signal representing the amount of movement of the film advanced by said advancing structure, and the state that the speed of rotation of said motor is slower than said reference speed is detected when said pulse signal is not produced within a preset prescribed time.
Claim 14
Dependent Claim
75 words
A camera according to claim 7, further comprising second control means for automatically changing the speed reduction ratio of said transmission system from said high speed transmission system to said low speed transmission system, said second control means automatically changing said speed reduction ratio of said transmission system when the fact that the speed of rotation of said motor is slower than the first reference speed is detected by said low speed abnormal detecting means.
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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |