US3833288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for producing a controllable scattering of light
Assignee: Individual
•
Filing: 1972-11-24
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Granted: 1974-09-03
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Expires: 1992-11-24
Abstract
Abstract The invention concerns a method for producing a controllable scattering of light in optic and photographic equipment, without causing any appreciable image distortion wherein a great number of small optic inhomogenities are inserted into the path of light flux. The dimensions and refractive index of said inhomogenities being selected so as to cause a wavelength-depending light scattering substantially free from refraction effects. The invention also includes a device for carrying out the specified method.
Inventors
- 👤 B Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:04
CPC Classifications
G; G02; G02B; G02B26/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
An optical device for controllably scattering light in optical and photographic apparatus to simulate the light scattering naturally caused by the human eye when viewing a source of light closely adjacent a darker background, without causing any significant image distortion, comprising; a substantially transparent optical element completely surrounding A plurality of very small optical inhomogeneities to isolate said inhomogeneities from contact with the surrounding atmosphere, adapted to be inserted in the path of light rays emanating from an image, wherein the dimensions of the inhomogeneities in a first direction substantially perpendicular to the light rays are less than 10 microns, and the product of the dimensions of the inhomogeneities in a second direction substantially parallel to the light rays and the difference between the refractive index of the inhomogeneities and the surrounding medium is less than one wavelength.
Claim 2
Dependent Claim
138 words
An optical device for controllably scattering light in optical and photographic apparatus to simulate the light scattering naturally caused by the human eye when viewing a source of light closely adjacent a darker background, without causing any significant image distortion, comprising; a substantially transparent optical element completely surrounding A plurality of very small optical inhomogeneities to isolate said inhomogeneities from contact with the surrounding atmosphere, adapted to be inserted in the path of light rays emanating from an image, wherein the dimensions of the inhomogeneities in a first direction substantially perpendicular to the light rays are less than 10 microns, and the product of the dimensions of the inhomogeneities in a second direction substantially parallel to the light rays and the difference between the refractive index of the inhomogeneities and the surrounding medium is less than one wavelength.
Claim 3
Dependent Claim
21 words
A device according to claim 1, wherein the cross-sectional dimensions of the inhomogeneities in any plane are less than 10 microns.
Claim 4
Dependent Claim
30 words
A device according to claim 2, wherein at least some of the inhomogeneities have a length of the order of 1 mm in a direction perpendicular to the light rays.
Claim 5
Dependent Claim
30 words
A device according to claim 2, wherein the greatest dimension of the inhomogeneities is less than 0.2 micron, to thereby cause an essentially isotropic scattering of light of short wavelength.
Claim 6
Dependent Claim
44 words
A device according to claim 1, wherein the element contains both substantially spherical inhomogeneities which cause a substantially isotropic light-scattering, and elongated substantially cylindrical inhomogeneities having a length on the order of 1 mm and transverse dimensions not exceeding the order of 10 microns.
Claim 7
Dependent Claim
47 words
A device according to claim 1 wherein the dimension of the inhomogeneities in a direction substantially parallel to the light rays exceeds the order of 1 micron and the inhomogeneities are embedded in a substance having a refractive index differing only slightly from that of the inhomogeneities.
Claim 8
Dependent Claim
20 words
A device according to claim 1, wherein the distribution of the inhomogeneities varies over the area of the optical element.
Claim 9
Dependent Claim
31 words
A device according to claim 1, wherein the inhomogeneities consist of particles selected from the group comprising glass, plastic, and quartz embedded in a transparent substance applied on a transparent member.
Claim 10
Dependent Claim
19 words
A device according to claim 1, wherein the inhomogeneities consist of small impressions or cavities in a transparent substance.
Claim 11
Dependent Claim
20 words
A device according to claim 1, wherein the inhomogeneities consist of particles in a colloidal solution in a transparent liquid.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |