US5367153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting the focus adjusting state of an objective lens by performing filter processing
Assignee: Canon Inc
•
Filing: 1992-10-30
•
Granted: 1994-11-22
•
Expires: 2012-10-30
Abstract
Abstract A focus detection apparatus includes an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, a photoelectric conversion element, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and a calculating unit for performing filter processing of the first and second signals, sequentially displacing the first and second signals relative to each other on the calculation basis, calculating an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions, obtaining positional deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system on the basis of the deviations. The filter processing is performed using a filter determined by the relatively displaced positions.
Inventors
- 👤 Yasuo Suda
- 👤 Akira Yamada
- 👤 Yukio Odaka
- 👤 Akira Akashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:10
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
171 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for performing filter processing of the first and second signals, wherein the first and second signals are respectively processed through filters having mutually different characteristics, processed sequentially displacing the first and second signals relative to each other, calculating an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions, obtaining positional deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system on the basis of the deviations, the filter processing being performed using a filter determined by the relatively displaced positions.
Claim 2
Dependent Claim
171 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for performing filter processing of the first and second signals, wherein the first and second signals are respectively processed through filters having mutually different characteristics, processed sequentially displacing the first and second signals relative to each other, calculating an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions, obtaining positional deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system on the basis of the deviations, the filter processing being performed using a filter determined by the relatively displaced positions.
Claim 3
Dependent Claim
65 words
An apparatus according to claim 1, wherein said calculating means has a first processing step of producing said filter from first original filter information and a second processing step for producing said filter from second original filter information, and further comprises selecting means for selecting one of the first and second processing steps in accordance with the relative displacement of the first and second signals.
Claim 4
Dependent Claim
175 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, the filter processing, wherein the first and second signals are respectively processed through filters having mutually different characteristics, being performed using a filter determined by an aperture ratio of said imaging optical system subjected to focus detection.
Claim 5
Dependent Claim
175 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, the filter processing, wherein the first and second signals are respectively processed through filters having mutually different characteristics, being performed using a filter determined by an aperture ratio of said imaging optical system subjected to focus detection.
Claim 6
Dependent Claim
160 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, the filter processing, wherein the first and second signals are respectively processed through filters having mutually different characteristics, being performed using a filter determined by an exit pupil position of said imaging optical system subjected to focus detection.
Claim 7
Dependent Claim
160 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, the filter processing, wherein the first and second signals are respectively processed through filters having mutually different characteristics, being performed using a filter determined by an exit pupil position of said imaging optical system subjected to focus detection.
Claim 8
Dependent Claim
209 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said calculating means has a first processing step of performing the filter processing using a filter determined by the relative displacement and a second processing step, performed next to the first processing step, of performing the filter processing using a fixed filter regardless of the relative displacement, and said filter in the second processing step is determined on the basis of the image deviation obtained in the first processing step.
Claim 9
Dependent Claim
209 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said calculating means has a first processing step of performing the filter processing using a filter determined by the relative displacement and a second processing step, performed next to the first processing step, of performing the filter processing using a fixed filter regardless of the relative displacement, and said filter in the second processing step is determined on the basis of the image deviation obtained in the first processing step.
Claim 10
Dependent Claim
177 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, Wherein the first and second signals are respectively processed through filters having mutually different characteristics, using a filter determined by the relative displacement, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said filter corrects the first and second signals even when the relative displacement is zero.
Claim 11
Dependent Claim
177 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, Wherein the first and second signals are respectively processed through filters having mutually different characteristics, using a filter determined by the relative displacement, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said filter corrects the first and second signals even when the relative displacement is zero.
Claim 12
Dependent Claim
201 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said calculating means has a first processing step of performing the filter processing using a filter determined by the relative displacement and a second processing step, performed next to the first processing step, of performing the filter processing using a fixed filter regardless of the relative displacement, and further comprises selecting means for selecting one of the first and second processing steps.
Claim 13
Dependent Claim
201 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said calculating means has a first processing step of performing the filter processing using a filter determined by the relative displacement and a second processing step, performed next to the first processing step, of performing the filter processing using a fixed filter regardless of the relative displacement, and further comprises selecting means for selecting one of the first and second processing steps.
Claim 14
Dependent Claim
174 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, the filter processing being performed using a filter determined by a distance from an optical axis of the imaging optical system subjected to focus detection to a distance measuring field determined by said photoelectric converting means.
Claim 15
Dependent Claim
174 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, the filter processing being performed using a filter determined by a distance from an optical axis of the imaging optical system subjected to focus detection to a distance measuring field determined by said photoelectric converting means.
Claim 16
Dependent Claim
173 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said filter has only a positive component in one direction and positive and negative components in the other direction with respect to an origin.
Claim 17
Dependent Claim
173 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said filter has only a positive component in one direction and positive and negative components in the other direction with respect to an origin.
Claim 18
Dependent Claim
190 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said calculating means has a first processing step of performing filter processing of the first signal and a second processing step of performing filter processing of the second signal, and a filter used in the second processing step has characteristics obtained by inverting a filter used in the first processing step.
Claim 19
Dependent Claim
190 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals, obtaining deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said calculating means has a first processing step of performing filter processing of the first signal and a second processing step of performing filter processing of the second signal, and a filter used in the second processing step has characteristics obtained by inverting a filter used in the first processing step.
Claim 20
Dependent Claim
175 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said photoelectric converting means has picture elements used in the filter processing, which are located outside picture elements whose outputs are used to calculate the evaluation amounts.
Claim 21
Dependent Claim
175 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system, wherein said photoelectric converting means has picture elements used in the filter processing, which are located outside picture elements whose outputs are used to calculate the evaluation amounts.
Claim 22
Dependent Claim
186 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and performing a defocus conversion calculation of the image deviation to form a signal representing the imaging state of the imaging optical system, wherein the defocus conversion calculation of the image deviation is a function of an aperture ratio of the imaging optical system subjected to focus detection.
Claim 23
Dependent Claim
186 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and performing a defocus conversion calculation of the image deviation to form a signal representing the imaging state of the imaging optical system, wherein the defocus conversion calculation of the image deviation is a function of an aperture ratio of the imaging optical system subjected to focus detection.
Claim 24
Dependent Claim
187 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and performing a defocus conversion calculation of the image deviation to form a signal representing the imaging state of the imaging optical system, wherein the defocus conversion calculation of the image deviation is a function of an exit pupil position of the imaging optical system subjected to focus detection.
Claim 25
Dependent Claim
187 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and performing a defocus conversion calculation of the image deviation to form a signal representing the imaging state of the imaging optical system, wherein the defocus conversion calculation of the image deviation is a function of an exit pupil position of the imaging optical system subjected to focus detection.
Claim 26
Dependent Claim
207 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and performing a defocus conversion calculation of the image deviation to form a signal representing the imaging state of the imaging optical system, wherein the defocus conversion calculation of the image deviation is a function of a representative distance from an optical axis of said imaging optical system subjected to focus detection to a distance measuring field determined by said photoelectric converting means comprising the plurality of picture elements.
Claim 27
Dependent Claim
207 words
A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for, when the first and second signals are sequentially displaced relative to each other, and an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions is calculated, performing filter processing of the first and second signals using a filter determined by the relatively displaced positions, obtaining image deviations between the first and second object images on the basis of a change in evaluation amount, and performing a defocus conversion calculation of the image deviation to form a signal representing the imaging state of the imaging optical system, wherein the defocus conversion calculation of the image deviation is a function of a representative distance from an optical axis of said imaging optical system subjected to focus detection to a distance measuring field determined by said photoelectric converting means comprising the plurality of picture elements.
Claim 28
Dependent Claim
110 words
A focus detection apparatus comprising: an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system; photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions; filter processing means for employing filter-processing wherein the first and second signals are respectively processed through filters having mutually different characteristics; and detection means for detecting a focal point state of said imaging optical system on the basis of the first and second signals to which said filter-processing is applied.
Claim 29
Dependent Claim
110 words
A focus detection apparatus comprising: an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system; photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions; filter processing means for employing filter-processing wherein the first and second signals are respectively processed through filters having mutually different characteristics; and detection means for detecting a focal point state of said imaging optical system on the basis of the first and second signals to which said filter-processing is applied.
References Cited (Backward Citations)
US4559446A
Cited
JPS58142306A
Cited
JPS59107313A
Cited
US5191201A
Cited
JPS60101513A
Cited
US4914282A
Cited
US4739157A
Cited
US4734571A
Cited
US4792668A
Cited
US4800261A
Cited
US4833313A
Cited
US4812869A
Cited
US5126777A
Cited
US5022555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |