Patent US4870487A successfully refreshed from Google Patents.
US4870487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light source device for an endoscope which maintains a constant minimum-DC current
Assignee: Olympus Corp
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Filing: 1988-09-15
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Granted: 1989-09-26
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Expires: 2008-09-15
Abstract
Abstract A white light of a lamp, which can flash, is passed through a rotary filter fitted with a plurality of color filters to output field sequential type colored light. An output signal of a color filter detecting device, detecting the timing when the color filters are interposed in a light path, is used to produce trigger signals having different delay amounts. The light emitting timing of the lamp is delayed relatively from the time when the color filters are interposed in the light path to control the emitted light amounts of the colored light.
Inventors
- 👤 Toshiaki Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:06
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/04; A61B1/05; H; H04; H04N; H04N23/00; H04N23/10; H04N23/125; H04N23/70; H04N23/74; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/34; H04N23/50; H04N23/555
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
A light source device for supplying illuminating light to an endoscope comprising: a short-arc lamp emitting light in response to a supply of a D.C. current; lighting circuit means for supplying a D.C. base current of a low level to said short-arc lamp and for supplying a pulse current of a high level at a suitable period to turn on said short-arc lamp; and shutter means, disposed in a path of light of the illuminating light emitted from said short-arc lamp, said shutter means for opening and closing at a period which is substantially the same as the period of turning on of said short-arc lamp.
Claim 2
Dependent Claim
106 words
A light source device for supplying illuminating light to an endoscope comprising: a short-arc lamp emitting light in response to a supply of a D.C. current; lighting circuit means for supplying a D.C. base current of a low level to said short-arc lamp and for supplying a pulse current of a high level at a suitable period to turn on said short-arc lamp; and shutter means, disposed in a path of light of the illuminating light emitted from said short-arc lamp, said shutter means for opening and closing at a period which is substantially the same as the period of turning on of said short-arc lamp.
Claim 3
Dependent Claim
32 words
A light source device according to claim 1, wherein said lighting circuit means is for supplying at least said D.C. base current in the period in which said shutter means is closed.
Claim 4
Dependent Claim
30 words
A light source device according to claims 1 or 2, wherein said lighting circuit means is for supplying said D.C. base current regardless of a state of said shutter means.
Claim 5
Dependent Claim
70 words
A light source device according to any one of claims 1 or 2, wherein said shutter means includes a rotary filter having a light-shielding disk frame having a plurality of sector openings arranged in the circumferential direction and color transmitting filters on the plurality of sector openings, and a motor for rotatingly driving said rotary filter to bring said color transmission filters successively into the path of the illuminating light.
Claim 6
Dependent Claim
24 words
A light source device according to claim 4, wherein said color transmission filters transmit lights of wavelengths corresponding to red, green and blue colors.
Claim 7
Dependent Claim
179 words
A light source device for supplying illuminating light to an endoscope comprising: a short-arc lamp emitting light in response to a supply of a D.C. current; lighting circuit means for supplying a D.C. base current of a low level to said short-arc lamp and for supplying a pulse current of a high level at a suitable period to turn on said short-arc lamp; and shutter means, disposed in a path of light of the illuminating light emitted from said short-arc lamp, said shutter means for opening and closing at a period which is substantially the same as the period of turning on of said short-arc lamp, said shutter means including a rotary filter having a light-shielding disk frame having a plurality of sector openings arranged in the circumferential direction and color transmitting filters on the plurality of sector openings, and a motor for rotatingly driving said rotary filter to bring said color transmission filters successively into the path of the illuminating light, wherein said lighting circuit supplying said D.C. base current regardless of a state of said shutter means.
Claim 8
Dependent Claim
179 words
A light source device for supplying illuminating light to an endoscope comprising: a short-arc lamp emitting light in response to a supply of a D.C. current; lighting circuit means for supplying a D.C. base current of a low level to said short-arc lamp and for supplying a pulse current of a high level at a suitable period to turn on said short-arc lamp; and shutter means, disposed in a path of light of the illuminating light emitted from said short-arc lamp, said shutter means for opening and closing at a period which is substantially the same as the period of turning on of said short-arc lamp, said shutter means including a rotary filter having a light-shielding disk frame having a plurality of sector openings arranged in the circumferential direction and color transmitting filters on the plurality of sector openings, and a motor for rotatingly driving said rotary filter to bring said color transmission filters successively into the path of the illuminating light, wherein said lighting circuit supplying said D.C. base current regardless of a state of said shutter means.
Claim 9
Dependent Claim
185 words
A light source device for supplying illuminating light to an endoscope comprising: a short-arc lamp emitting light in response to a supply of a D.C. current; lighting circuit means for supplying a D.C. base current of a low level to said short-arc lamp and for supplying a pulse current of a high level at a suitable period to turn on said short-arc lamp; and shutter means, disposed in a path of light of the illuminating light emitted from said short-arc lamp, said shutter means for opening and closing at a period which is substantially the same as the period of turning on of said short-arc lamp, said shutter means including a rotary filter having a light-shielding disk frame having a plurality of sector openings arranged in the circumferential direction and color transmitting filters on the plurality of sector openings, and a motor for rotatingly driving said rotary filter to bring said color transmission filters successively into the path of the illuminating light, wherein said lighting circuit means for supplying at least said D.C. base current in the period in which said shutter means is closed.
Claim 10
Dependent Claim
185 words
A light source device for supplying illuminating light to an endoscope comprising: a short-arc lamp emitting light in response to a supply of a D.C. current; lighting circuit means for supplying a D.C. base current of a low level to said short-arc lamp and for supplying a pulse current of a high level at a suitable period to turn on said short-arc lamp; and shutter means, disposed in a path of light of the illuminating light emitted from said short-arc lamp, said shutter means for opening and closing at a period which is substantially the same as the period of turning on of said short-arc lamp, said shutter means including a rotary filter having a light-shielding disk frame having a plurality of sector openings arranged in the circumferential direction and color transmitting filters on the plurality of sector openings, and a motor for rotatingly driving said rotary filter to bring said color transmission filters successively into the path of the illuminating light, wherein said lighting circuit means for supplying at least said D.C. base current in the period in which said shutter means is closed.
Claim 11
Dependent Claim
26 words
A light source device according to claims 6 or 7, wherein said color transmission filters transmit lights of wavelengths corresponding to red, green and blue colors.
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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |