US3970371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for chopping light beam
Assignee: Nidec Advanced Motor Corp
•
Filing: 1974-03-15
•
Granted: 1976-07-20
•
Expires: 1994-03-15
Abstract
Abstract A light beam chopping or intercepting apparatus capable of repeatedly and sequentially intercepting and passing a light beam at a regular cycle by rotatively vibrating a disk-shaped vibrating body in a casing, wherein the disk-shaped vibrating body and the casing have transparent windows through which the light beam is passed. A detection coil and an excitation coil are mounted on the inner wall of the casing, in respective positions opposite to two magnets provided on the disk-shaped vibrating body. A transistor circuit having these coils on its base side and on its collector side, respectively, is operated as the vibration generating source. Coiled springs installed between the rotation center shaft and the casing provide the repeating vibration force. The number of vibrations can be arbitrarily changed, for example, by adjusting the spring constants of the coil springs.
Inventors
- 👤 Yataro Kaiwa
- 👤 Hiroshi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:51
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/02; G02B26/04; G01; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/34; G01J1/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A light beam intercepting apparatus which comprises a casing containing at least one transparent window for the passage of a light beam therethrough, a disk-shaped vibrating body rotatably disposed within said casing, said disk-shaped body having a partially cut-away portion, two magnets located at different portions of said disk-shaped body, a detection coil and an excitation coil disposed in the inner wall of the casing at locations opposite to said two magnets, respectively, a transistor circuit having said detection coil and excitation coil in its base side and collector side, respectively, for supplying said rotating, vibration force to said disk-shaped body, spring means attached to said disk-shaped body and to the casing to provide a repeating rotational cycle to the disk-shaped body, said light beam passing through the transparent window being repeatedly intercepted by the repeating cycle of said disk-shaped body, and an additional magnet for controlling the amplitude of the rotating vibration of the disk-shaped vibrating body to a constant value, said additional magnet being disposed on the inner wall of the casing in close proximity to the detection coil, thereby causing the light beam to be turned on and off based on said cycle.
Claim 2
Dependent Claim
196 words
A light beam intercepting apparatus which comprises a casing containing at least one transparent window for the passage of a light beam therethrough, a disk-shaped vibrating body rotatably disposed within said casing, said disk-shaped body having a partially cut-away portion, two magnets located at different portions of said disk-shaped body, a detection coil and an excitation coil disposed in the inner wall of the casing at locations opposite to said two magnets, respectively, a transistor circuit having said detection coil and excitation coil in its base side and collector side, respectively, for supplying said rotating, vibration force to said disk-shaped body, spring means attached to said disk-shaped body and to the casing to provide a repeating rotational cycle to the disk-shaped body, said light beam passing through the transparent window being repeatedly intercepted by the repeating cycle of said disk-shaped body, and an additional magnet for controlling the amplitude of the rotating vibration of the disk-shaped vibrating body to a constant value, said additional magnet being disposed on the inner wall of the casing in close proximity to the detection coil, thereby causing the light beam to be turned on and off based on said cycle.
Claim 3
Independent Claim
226 words
A method of systematically intercepting a light beam using a disk-shaped vibrating body containing first, second and third magnetic portions, said disk-shaped body being rotatably disposed within a casing having window portions for transmitting said light beam and spring means attached to the disk-shaped body and the casing, which comprises utilizing a transistor circuit containing a detection coil, an excitation coil, a transistor and a DC power source wherein when the disk-shaped body rotates in the counterclockwise direction, the magnetic flux of said first magnetic portion is intercepted by the detection coil which turns on the transistor to cause the current to flow in the excitation coil, which, as a result, an electromagnetic force is produced across the excitation coil to attract the second magnetic portion thereby causing the disk-shaped body to rotate clockwise, the displacement of the vibrating disk causing the first magnetic portion to leave the detection coil, said third magnetic portion being attached to the casing and in close proximity to the detection coil so that when the disk-shaped body rotates through more than a given constant angle, the repulsive force exerted between the fist magnetic portion and the third magnetic portion becomes large while the repulsive force between the second magnetic portion and the third magnetic portion becomes small, whereby the amplitude of the disk-shaped body is maintained constant at all times.
Claim 4
Independent Claim
226 words
A method of systematically intercepting a light beam using a disk-shaped vibrating body containing first, second and third magnetic portions, said disk-shaped body being rotatably disposed within a casing having window portions for transmitting said light beam and spring means attached to the disk-shaped body and the casing, which comprises utilizing a transistor circuit containing a detection coil, an excitation coil, a transistor and a DC power source wherein when the disk-shaped body rotates in the counterclockwise direction, the magnetic flux of said first magnetic portion is intercepted by the detection coil which turns on the transistor to cause the current to flow in the excitation coil, which, as a result, an electromagnetic force is produced across the excitation coil to attract the second magnetic portion thereby causing the disk-shaped body to rotate clockwise, the displacement of the vibrating disk causing the first magnetic portion to leave the detection coil, said third magnetic portion being attached to the casing and in close proximity to the detection coil so that when the disk-shaped body rotates through more than a given constant angle, the repulsive force exerted between the fist magnetic portion and the third magnetic portion becomes large while the repulsive force between the second magnetic portion and the third magnetic portion becomes small, whereby the amplitude of the disk-shaped body is maintained constant at all times.
Claim 5
Dependent Claim
224 words
A light beam intercepting apparatus which comprises a casing containing at least one transparent window for the passage of a light beam therethrough, a disk-shaped vibrating body rotatably disposed within said casing, said disk-shaped body having a partially cut-away portion, two magnets attached to the respective ends of said disk-shaped body having said cut-away portion, a detection coil and an excitation coil disposed in the inner wall of the casing at locations opposite to said two magnets, respectively, an additional magnet for controlling the amplitude of the rotating vibration of the disk-shaped vibrating body to a constant value disposed on the inner wall of the casing in close proximity to the detection coil, a transistor circuit having said detection coil and excitation coil in its base side and collector side, respectively, for supplying a rotating, vibration force to said disk-shaped body, said transistor circuit including a DC power source for driving the transistor, and two spring coils, one end of each coil being secured to one point on the vibrating disk and the other end being secured to the casing to provide a repeating rotational cycle to the disk-shaped body, said light beam passing through the transparent window being repeatedly intercepted by the repeating cycle of said disk-shaped body, thereby causing the light beam to be turned on and off based on said cycle.
Claim 6
Dependent Claim
224 words
A light beam intercepting apparatus which comprises a casing containing at least one transparent window for the passage of a light beam therethrough, a disk-shaped vibrating body rotatably disposed within said casing, said disk-shaped body having a partially cut-away portion, two magnets attached to the respective ends of said disk-shaped body having said cut-away portion, a detection coil and an excitation coil disposed in the inner wall of the casing at locations opposite to said two magnets, respectively, an additional magnet for controlling the amplitude of the rotating vibration of the disk-shaped vibrating body to a constant value disposed on the inner wall of the casing in close proximity to the detection coil, a transistor circuit having said detection coil and excitation coil in its base side and collector side, respectively, for supplying a rotating, vibration force to said disk-shaped body, said transistor circuit including a DC power source for driving the transistor, and two spring coils, one end of each coil being secured to one point on the vibrating disk and the other end being secured to the casing to provide a repeating rotational cycle to the disk-shaped body, said light beam passing through the transparent window being repeatedly intercepted by the repeating cycle of said disk-shaped body, thereby causing the light beam to be turned on and off based on said cycle.
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |