US3752561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torsioned light conducting means for the illumination of an image field with modulated light
Assignee: KLEMT A KG DT
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Filing: 1971-08-12
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Granted: 1973-08-14
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Expires: 1991-08-12
Abstract
Abstract Apparatus for uniformly illuminating an image area with modulated light is disclosed in accordance with the teachings of the present invention. Light of constant intensity is emitted from a light source and periodically interrupted by movable aperture means interposed in the light path extending between the light source and the image area. Elongated light conducting means including a helical portion formed about the longitudinal axis thereof receives the modualted light. The modulated light is subjected to multiple reflections while traversing the helical portion to cause a complete mixing of the received light. The mixed light is transmitted to the image area and admits of an intensity determined by the amount of light transmitted through the movable aperture means. A moving shadow is, therefore, not introduced across the surface of the image area.
Inventors
- 👤 A Klemt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:37
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0005; G02B6/0006; G02B26/00; G02B26/02; G02B26/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
Apparatus for uniformly illuminating an image area with modulated light, comprising: a light source for emitting light of a constant intensity; movable aperture means having alternating transparent and opaque portions interposed in the light path extending between the light source and the image area for periodically interrupting said light path, thereby modulating the light emitted by said light source; and elongated light conducting means including a helical portion comprised of the torsion of said light conducting means about the longitudinal axis thereof for receiving said modulated light and for transmitting said modulated light to said image area, said helical portion providing multiple reflecting paths for complete mixing of said received modulated light passing through said light conducting means such that each portion of said illuminated image area simultaneously receives light of substantially the ame intensity.
Claim 2
Dependent Claim
135 words
Apparatus for uniformly illuminating an image area with modulated light, comprising: a light source for emitting light of a constant intensity; movable aperture means having alternating transparent and opaque portions interposed in the light path extending between the light source and the image area for periodically interrupting said light path, thereby modulating the light emitted by said light source; and elongated light conducting means including a helical portion comprised of the torsion of said light conducting means about the longitudinal axis thereof for receiving said modulated light and for transmitting said modulated light to said image area, said helical portion providing multiple reflecting paths for complete mixing of said received modulated light passing through said light conducting means such that each portion of said illuminated image area simultaneously receives light of substantially the ame intensity.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1 wherein said helical portion of said light conducting means is disposed in a middle section thereof and said light conducting means includes substantially straight first and second end sections.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 wherein said light conducting means is comprised of a light conducting rod having a multiangular cross-section.
Claim 5
Dependent Claim
29 words
The apparatus of claim 3 wherein said light conducting rod includes a light receiving side comprised of a plane normal to the longitudinal axis of said light conducting rod.
Claim 6
Dependent Claim
51 words
The apparatus of claim 3 wherein said lighT conducting rod includes substantially straight first and second end sections and a light receiving side comprised of a cylindrical lens for refracting said modulated light transmitted to said light receiving side whereby said refracted light is reflected in said first straight end section.
Claim 7
Dependent Claim
21 words
The apparatus of claim 3 wherein said light conducting rod is comprised of glass having a surface exhibiting high light reflectance.
Claim 8
Dependent Claim
12 words
The apparatus of claim 6 wherein said glass is color tinted glass.
Claim 9
Dependent Claim
23 words
The apparatus of claim 3 wherein said light conducting rod is comprised of light conducting plastic having a surface exhibiting high light reflectance.
Claim 10
Dependent Claim
14 words
The apparatus of claim 8 wherein said light conducting plastic is color tinted plastic.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |