US4306143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for extracting a plurality of space frequency components
Assignee: Nikon Corp
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Filing: 1980-01-03
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Granted: 1981-12-15
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Expires: 2000-01-03
Abstract
Abstract A device for extracting a plurality of space frequency components from an optical image formed by an image forming optical system comprises a photoelectric element array including at least N photoelectric elements disposed in or near the image formation plane of the image forming optical system, and means for generating, on the basis of the output of each of the photoelectric elements of the array, an electrical output varying in phase in accordance with the displacement of the optical image in the direction of arrangement of the photoelectric elements.
Inventors
- 👤 Ken Utagawa
- 👤 Kunihisa Hoshino
- 👤 Hiroshi Shirasu
- 👤 Akira Ogasawara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:00
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36; G02B7/365
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
223 words
A device for extracting a plurality of spaces frequency components from an optical image formed by an image forming optical system, comprising: (a) a photoelectric element array including at least N photoelectric elements disposed in or near the image formation plane of said image forming optical system; and (b) means for generating, on the basis of the output of each of the photoelectric elements of said array, an electrical output varying in phase in accordance with the displacement of said optical image in the direction of arrangement of said photoelectric elements, said means including first vectorizing means for converting the outputs of said photoelectric elements into vectors so that the output of the nth photoelectric element of said array becomes a vector having an absolute value related to said output and a phase given by π/N×p 1 ×n, first adding means for adding together the vector outputs of said first vectorizing means, second vectorizing means for converting the outputs of said photoelectric elements into vectors so that the output of the nth photoelectric element of said array becomes a vector having an absolute value related to said output and a phase given by 2π/N×p 2 ×n, and second adding means for adding together the vector outputs of said second vectorizing means, where p 1 and p 2 are different integers less than N/2.
Claim 2
Independent Claim
223 words
A device for extracting a plurality of spaces frequency components from an optical image formed by an image forming optical system, comprising: (a) a photoelectric element array including at least N photoelectric elements disposed in or near the image formation plane of said image forming optical system; and (b) means for generating, on the basis of the output of each of the photoelectric elements of said array, an electrical output varying in phase in accordance with the displacement of said optical image in the direction of arrangement of said photoelectric elements, said means including first vectorizing means for converting the outputs of said photoelectric elements into vectors so that the output of the nth photoelectric element of said array becomes a vector having an absolute value related to said output and a phase given by π/N×p 1 ×n, first adding means for adding together the vector outputs of said first vectorizing means, second vectorizing means for converting the outputs of said photoelectric elements into vectors so that the output of the nth photoelectric element of said array becomes a vector having an absolute value related to said output and a phase given by 2π/N×p 2 ×n, and second adding means for adding together the vector outputs of said second vectorizing means, where p 1 and p 2 are different integers less than N/2.
Claim 3
Dependent Claim
57 words
The device according to claim 1, wherein each of said first and second vectorizing means includes: means for receiving as inputs the outputs of two of said photoelectric elements converted into vectors out of phase by π with each other, of the outputs of said photoelectric elements, and calculating and putting out the difference between said inputs.
Claim 4
Dependent Claim
24 words
The device according to claim 1 or 2, wherein said integers p 1 and p 2 are p 1 =1 and p 2 =2.
Claim 5
Dependent Claim
151 words
The device according to claim 1, wherein each of said first and second vectorizing means includes: (a) means for putting out the sum of the first direction components of the outputs of said photoelectric elements; (b) means for putting out the sum of the second direction components of the outputs of said photoelectric elements which are out of phase by π with said first direction components; (c) means for calculating the difference between the sum of the first direction components and the sum of the second direction components; (d) means for putting out the sum of the third direction components of the outputs of said photoelectric elements which are out of phase by π/2 with said first direction components; (e) means for putting out the sum of the fourth direction components of the outputs of said photoelectric elements which are out of phase by π with said third direction components; and
Claim 6
Dependent Claim
22 words
(f) means for calculating the difference between the sum of the third direction components and the sum of the fourth direction components.
Claim 7
Dependent Claim
22 words
(f) means for calculating the difference between the sum of the third direction components and the sum of the fourth direction components.
References Cited (Backward Citations)
US4084907A
Cited
US4218623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |