Patent US3836251A successfully refreshed from Google Patents.
US3836251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination system for film recording apparatus
Assignee: Bell and Howell Co
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Filing: 1973-04-09
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Granted: 1974-09-17
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Expires: 1993-04-09
Abstract
Abstract A microfilm apparatus including an illumination system having a long light path between a source of light and a document retaining exposure platen in a relatively compact structure. Only reflected, or indirect, light illuminates the exposure platen; all stray and direct light is absorbed by the unique baffle and light absorbing structure in the apparatus. To achieve compactness, the novel light path construction enables the distance between two light sources to be less than the width of the exposure platen.
Inventors
- 👤 P Weber
- 👤 H Hertel
- 👤 R Kearney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:18
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/542
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
An illumination system for a film recording apparatus having a long light path from a source of light to a document retaining exposure platen in a relatively small structure comprising: a housing; reflecting means associated with said housing for reflecting a portion of light from said source to said exposure platen for illuminating said exposure platen, said portion of light from Said reflecting means illuminates the complete width of said exposure platen; light absorbing means internal of said housing for absorbing all remaining light eminating from said source; and baffle means positioned relative to said light source to absorb additional light reflected from said reflecting means, which light is not directed to said exposure platen.
Claim 2
Dependent Claim
115 words
An illumination system for a film recording apparatus having a long light path from a source of light to a document retaining exposure platen in a relatively small structure comprising: a housing; reflecting means associated with said housing for reflecting a portion of light from said source to said exposure platen for illuminating said exposure platen, said portion of light from Said reflecting means illuminates the complete width of said exposure platen; light absorbing means internal of said housing for absorbing all remaining light eminating from said source; and baffle means positioned relative to said light source to absorb additional light reflected from said reflecting means, which light is not directed to said exposure platen.
Claim 3
Dependent Claim
31 words
The illumination system of claim 1 wherein said light absorbing means includes surfaces interior of said housing coated with light absorbent materials selectively disposed throughout the interior portion of said apparatus.
Claim 4
Dependent Claim
25 words
The illumination system of claim 1 wherein the portion of light reflected from said reflecting means is the sole means of illuminating said exposure platen.
Claim 5
Dependent Claim
84 words
The illumination system of claim 1 wherein said baffle means includes an element extending between said light source and said exposure platen, a segment of said element being disposed in the path of a second portion of said light reflected by said reflecting means, which second portion of light is not reflected toward said exposure platen; said segment adapted to absorb said second portion of reflected light and to form a light guide for said portion of reflected light directed towards said exposure platen.
Claim 6
Dependent Claim
21 words
The illumination system of claim 1 wherein said reflecting means includes a mirror disposed on the interior surface of said apparatus.
Claim 7
Dependent Claim
159 words
An illumination system for a film recording apparatus having a long light path from a source of light to a document retaining exposure platen of predetermined length and width in a relatively small structure comprising: a housing; two light sources in said housing disposed lengthwise relative to said exposure platen at a fixed distance apart; said distance between said light sources being less than the width of said exposure platen; reflecting means associated with said housing and disposed adjacent of each of said light sources for reflecting a portion of light from each light source to said exposure platen, said portion from each light from said reflecting means illuminates the complete width of said exposure platen; light absorbing means internal of said housing for absorbing all remaining light eminating from said source; and baffle means positioned relative to said light source to absorb additional light reflected from said reflecting means, which light is not directed to said exposure platen.
Claim 8
Dependent Claim
159 words
An illumination system for a film recording apparatus having a long light path from a source of light to a document retaining exposure platen of predetermined length and width in a relatively small structure comprising: a housing; two light sources in said housing disposed lengthwise relative to said exposure platen at a fixed distance apart; said distance between said light sources being less than the width of said exposure platen; reflecting means associated with said housing and disposed adjacent of each of said light sources for reflecting a portion of light from each light source to said exposure platen, said portion from each light from said reflecting means illuminates the complete width of said exposure platen; light absorbing means internal of said housing for absorbing all remaining light eminating from said source; and baffle means positioned relative to said light source to absorb additional light reflected from said reflecting means, which light is not directed to said exposure platen.
Claim 9
Dependent Claim
23 words
The illumination system of claim 6 wherein the reflected light from said two sources is the sole means of illuminating said exposure platen.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |