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다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0537960 (2004-01-28) |
등록번호 | US-7436496 (2008-10-14) |
우선권정보 | JP-2003-025609(2003-02-03); JP-2003-132945(2003-05-12) |
국제출원번호 | PCT/JP04/000767 (2004-01-28) |
§371/§102 date | 20060301 (20060301) |
국제공개번호 | WO04/070313 (2004-08-19) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 340 인용 특허 : 3 |
A distance image sensor for removing the background light and improving the charge transfer efficiency in a device for measuring the distance to an object by measuring the time-of-flight of the light. In a distance image sensor for determining the signals of two charge storage nodes which depend on
A distance image sensor for removing the background light and improving the charge transfer efficiency in a device for measuring the distance to an object by measuring the time-of-flight of the light. In a distance image sensor for determining the signals of two charge storage nodes which depend on the delay time of the modulated light, a signal by the background light is received from the third charge storage node or the two charge storage nodes in a period when the modulated light does not exist, and is subtracted from the signal which depends on the delay time of the two charge storage nodes, so as to remove the influence of the background. Also by using a buried diode as a photo-detector, and using an MOS gate as gate means, the charge transfer efficiency improves. The charge transfer efficiency is also improved by using a negative feedback amplifier where a capacitor is disposed between the input and output.
The invention claimed is: 1. A distance image sensor for projecting light from a light source to an object intermittently and measuring the distance by the delay time of the reflected light thereof, comprising: a photo-detector (PD) having a photo-diode structure buried in a semiconductor substrate
The invention claimed is: 1. A distance image sensor for projecting light from a light source to an object intermittently and measuring the distance by the delay time of the reflected light thereof, comprising: a photo-detector (PD) having a photo-diode structure buried in a semiconductor substrate for converting reflected light from an object into charges; a plurality of gate means (G1, G2) having an MOS (Metal Oxide Semiconductor) structure on a semiconductor substrate; a plurality of charge storage nodes (C1, C2); and control means (6) for controlling the switching of said gate means, wherein at least two of said charge storage nodes, that is a first charge storage node and a second charge storage node, charges from said photo-detector are alternately transferred and stored, synchronizing the light intermittent operation from said light source, by said gate means, that is a first gate means and a second gate means, so that the charge transfer efficiency from said photo-detector is improved and the distance to the object is determined using the distribution ratio of the stored charges. 2. The distance image sensor according to claim 1, further comprising a third gate (G3) means in a third charge storage node (C3), wherein when reflected light by projected light does not exist, charges by background light are transferred to said third charge storage node by opening said third gate means, so that the charges are stored in said third charge storage node for removing background light. 3. The distance image sensor according to claim 1, further comprising sampling & hold means corresponding to each of said charge storage nodes. 4. A distance image sensor for projecting light from a light source to an object intermittently and measuring the distance by the delay time of the reflected light thereof, comprising: a photo-detector for converting reflected light from an object into charges; an inversion amplifier to which signal charges from said photo-detector are input; a first serial circuit further comprising a first capacitor (C1) and first switching means (Φ1) connected to said first capacitor in series; a second serial circuit further comprising a second capacitor (C2) and second switching means (Φ2) connected to said second capacitor in series; and control means (6) for controlling the switching of said first and second switching means, wherein said first serial circuit is connected between the output and the input of said inversion amplifier, and said second serial circuit is connected between the output and the input of said inversion amplifier to construct a negative feedback amplifier, signal charges which depend on the delay time of the reflected light from an object are distributed to said first capacitor and said second capacitor by switching of said first and second switching means, so that the charge transfer efficiency from said photo-detector is improved and information on distance to the object is acquired from the charges stored in said first and second capacitors. 5. The distance image sensor according to claim 4, further comprising a third serial circuit which comprises a third capacitor (C3) and third switching means (Φ3) connected to said third capacitor in series, wherein charges by background light are transferred to said third capacitor by closing said third switching means when the reflected light by the projected light does not exist, so that the charges are stored in said third capacitor for removing the background light. 6. A distance image sensor for projecting light from a light source to an object intermittently and measuring the distance by the delay time of the reflected light thereof, comprising: a photo-detector for converting reflected light from an object into charges; an inversion amplifier to which signal charges from said photo-detector are input; a first serial circuit further comprising a first capacitor (C1) and first switching means (Φ1) connected to said first capacitor in series; a second serial circuit further comprising a second capacitor (C2) and second switching means (Φ2) connected to said second capacitor in series; control means (6) for controlling the switching of said first and second switching means, wherein said first serial circuit is connected between the output and the input of said inversion amplifier, and said second serial circuit is connected between the output and the input of said inversion amplifier to construct a negative feedback amplifier, signal charges which depend on the delay time of the reflected light from an object are distributed to said first capacitor and said second capacitor by switching of said first and second switching means, so that the charge transfer efficiency from said photo-detector is improved and information on distance to the object is acquired from the charges stored in said first and second capacitors and wherein the r (r=1, 2, . . . n)-th capacitor for holding is connected to the output of said inversion amplifier via the r-th gate, the charges stored in said r-th capacitor are transferred to said r-th capacitor for holding by opening said r-th gate corresponding to the closing of said r-th switching means, and sampling & holding operation of charges is performed, so that calculation is enabled for all the pixels simultaneously. 7. The distance image sensor according to claim 1, wherein a brightness image signal is acquired from the sum of the charges stored in said first and second capacitors or storage nodes, the sum of charges stored in said first to third capacitors or storage nodes, or charges stored in said third capacitor or storage node. 8. A distance image sensor for projecting light from a light source to an object intermittently and measuring the distance by the delay time of the reflected light thereof, comprising: a photo-detector (PD) having a photo-diode structure buried in a semiconductor substrate for converting reflected light from an object into charges; a plurality of gate means (G1, G2) having an MOS (Metal Oxide Semiconductor) structure on a semiconductor substrate; a plurality of charge storage nodes (C1, C2); control means (6) for controlling the switching of said gate means, wherein at least two of said charge storage nodes, that is a first charge storage node and a second charge storage node, charges from said photo-detector are alternately transferred and stored, synchronizing the light intermittent operation from said light source, by said gate means, that is a first gate means and a second gate means, so that the charge transfer efficiency from said photo-detector is improved and the distance to the object is determined using the distribution ratio of the stored charges and voltage control delay means for passing signals for controlling the switching of said first and second gate means or switching means, wherein a signal based on the difference of the charges stored in said storage node or capacitor is supplied to said voltage control delay means as a control signal with polarity where said difference of charges approaches zero, so as to form a negative feedback loop. 9. The distance image sensor according to claim 1, wherein the pulse width for receiving the projection light, that is the period when said gate is open, or the period when said switching means is closed, is sufficiently short with respect to the repeat cycle. 10. The distance image sensor according to claim 9, comprising reset means for clearing the charges by the background light synchronizing each cycle of the repeat cycle of the projection light. 11. The distance image sensor according to claim 1, wherein said control means controls said gate means or switching means so that the charges at the moment when the reflected light rises are stored in said first charge storage node or capacitor, and charges after reflected light is at a stable level are stored in said second charge storage node or capacitor. 12. The distance image sensor according to claim 4, wherein a brightness image signal is acquired from the sum of the charges stored in said first and second capacitors or storage nodes, the sum of charges stored in said first to third capacitors or storage nodes, or charges stored in said third capacitor or storage node. 13. A distance image sensor for projecting light from a light source to an object intermittently and measuring the distance by the delay time of the reflected light thereof, comprising: a photo-detector for converting reflected light from an object into charges; an inversion amplifier to which signal charges from said photo-detector are input; a first serial circuit further comprising a first capacitor (C1) and first switching means (Φ1) connected to said first capacitor in series; a second serial circuit further comprising a second capacitor (C2) and second switching means (Φ1) connected to said second capacitor in series; control means (6) for controlling the switching of said first and second switching means, wherein said first serial circuit is connected between the output and the input of said inversion amplifier, and said second serial circuit is connected between the output and the input of said inversion amplifier to construct a negative feedback amplifier, signal charges which depend on the delay time of the reflected light from an object are distributed to said first capacitor and said second capacitor by switching of said first and second switching means, so that the charge transfer efficiency from said photo-detector is improved and information on distance to the object is acquired from the charges stored in said first and second capacitors and voltage control delay means for passing signals for controlling the switching of said first and second gate means or switching means, wherein a signal based on the difference of the charges stored in said storage node or capacitor is supplied to said voltage control delay means as a control signal with polarity where said difference of charges approaches zero, so as to form a negative feedback loop. 14. The distance image sensor according to claim 4, wherein the pulse width for receiving the projection light, that is the period when said gate is open, or the period when said switching means is closed, is sufficiently short with respect to the repeat cycle. 15. The distance image sensor according to claim 14, comprising reset means for clearing the charges by the background light synchronizing each cycle of the repeat cycle of the projection light. 16. The distance image sensor according to claim 4, wherein said control means controls said gate means or switching means so that the charges at the moment when the reflected light rises are stored in said first charge storage node or capacitor, and charges after reflected light is at a stable level are stored in said second charge storage node or capacitor.
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