US4696552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection device with refractive index distribution type lens
Assignee: Canon Inc
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Filing: 1986-06-26
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Granted: 1987-09-29
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Expires: 2006-06-26
Abstract
Abstract A projection device has an illuminating system for illuminating an object, and an index distribution type lens for projecting the image of the object. The lens has a refractive index distribution substantially proportional to the square of the distance from the optic axis in a cross-section perpendicular to the optic axis and a refractive index distribution monotonously varying in the direction of the optic axis.
Inventors
- 👤 Jun Hattori
- 👤 Shigeyuki Suda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:49
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G02; G02B; G02B3/00; G02B3/0087; G03G15/043; G03G15/0435
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
A projection device having: an illuminating system for illuminating an object; and an index distribution type lens for projecting the image of said object, said lens having a refractive index distribution substantially proportional to the square of the distance from the optic axis in a cross-section perpendicular to the optic axis and a refractive index distribution monotonously varying in the direction of the optic axis.
Claim 2
Dependent Claim
65 words
A projection device having: an illuminating system for illuminating an object; and an index distribution type lens for projecting the image of said object, said lens having a refractive index distribution substantially proportional to the square of the distance from the optic axis in a cross-section perpendicular to the optic axis and a refractive index distribution monotonously varying in the direction of the optic axis.
Claim 3
Dependent Claim
22 words
A projection device according to claim 1, wherein said index distribution type lens is arranged in the form of a one-dimensional array.
Claim 4
Dependent Claim
77 words
A projection device according to claim 1, wherein the refractive index distribution of said index distribution type lens is represented by the following equation: n(r, x)=(n.sub.00 +n.sub.01 ·x)+(n.sub.10 +n.sub.11 ·x)r.sup.2 + . . . where r is the height from the optic axis, x is the distance along the optic axis from the vertex adjacent to the object side, and n 00 , n 01 , n 10 , n 11 , . . . are constants.
Claim 5
Dependent Claim
73 words
A projection device according to claim 1, wherein the refractive index distribution of said index distribution type lens is represented by the following equation: n(r, x)=n.sub.00 +(n.sub.10 +n.sub.11 x)r.sup.2 + . . . where n 00 , n 10 , n 11 , . . . are constants, r is the height from the optic axis, and x is the distance along the optic axis from the vertex adjacent to the object side.
Claim 6
Dependent Claim
34 words
A projection device according to claim 1, wherein the spacing between said index distribution type lens and said object is longer than the spacing between said index distribution type lens and the image plane.
Claim 7
Dependent Claim
73 words
A projection device according to claim 5, wherein said index distribution type lens satisfies the following condition: ##EQU9## where Δn 1 is the maximum refractive index difference in the radial direction on the end surface of said lens which is adjacent to the object side, and Δn 2 is the maximum refractive index difference in the radial direction on the end surface of said lens which is adjacent to the image plane side.
Claim 8
Dependent Claim
44 words
An index distribution type lens having a refractive index distribution substantially proportional to the square of the distance from the optic axis in a cross-section perpendicular to the optic axis; and a refractive index distribution monotonously varying in the direction of the optic axis.
Claim 9
Dependent Claim
44 words
An index distribution type lens having a refractive index distribution substantially proportional to the square of the distance from the optic axis in a cross-section perpendicular to the optic axis; and a refractive index distribution monotonously varying in the direction of the optic axis.
Claim 10
Dependent Claim
21 words
A lens according to claim 7, wherein the incidence surface of said lens is a plane perpendicular to the optic axis.
Claim 11
Dependent Claim
75 words
A lens according to claim 7, wherein the refractive index distribution of said index distribution type lens is represented by the following equation: n(r, x)=(n.sub.00 +n.sub.01 ·x)+(n.sub.10 +n.sub.11 ·x)r.sup.2 +. . . where r is the height from the optic axis, x is the distance along the optic axis from the vertex adjacent to the object side, and n 00 , n 01 , n 10 , n 11 , . . . are constants.
Claim 12
Dependent Claim
71 words
A lens according to claim 7, wherein the refractive index distribution of said index distribution type lens is represented by the following equation: n(r, x)=n.sub.00 +(n.sub.10 +n.sub.11 x)r.sup.2 +. . . where n 00 , n 10 , n 11 , . . . are constants, r is the height from the optic axis, and x is the distance along the optic axis from the vertex adjacent to the object side.
Claim 13
Dependent Claim
74 words
A projection device according to claim 8, wherein said index distribution type lens satisfies the following condition: ##EQU10## where Δn 1 is the maximum refractive index difference in the radial direction on the end surface of said lens which is adjacent to the object side, and Δ n 2 is the maximum refractive index difference in the radial direction on the end surface of said lens which is adjacent to the image plane side.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |