US4412276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strobe reflector assembly
Assignee: Polaroid Corp
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Filing: 1981-12-07
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Granted: 1983-10-25
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Expires: 2001-12-07
Abstract
Abstract A strobe lighting unit--and a reflector assembly forming part thereof--include a concave reflector having a predetermined shape, typically including a parabolic cross-section. The reflector is formed in situ as part of an assembly process by pressing a thin precut planar blank of reflective material, preferably an aluminum alloy foil having selected mechanical properties, into a die cavity in the reflector housing with a conforming die plunger to bend the blank into the predetermined shape. During the bending process residual tension forces are induced intentionally into the blank and these forces urge the foil into contact with surfaces defining the die cavity to supportively maintain the reflector in the predetermined shape.
Inventors
- 👤 Igor Blinow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:45
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; F; F21; F21V; F21V7/00; F21V7/10; G03B2215/00; G03B2215/05; G03B2215/0514; G03B2215/0517; G03B2215/0525; G03B2215/0532
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
212 words
A strobe lighting unit including a reflector having a generally concave predetermined shape, said lighting unit comprising: a housing having an open ended cavity therein defined by surfaces which when engagingly contacted by reflective material support said material to form a reflector having said predetermined shape; a thin, substantially planar blank of bendable light reflective material having an initial shape that is formed into said predetermined shape in response to pressing said blank into said cavity with a conforming die plunger and having residual tension forces induced therein, as a result of such formation, that urge said material into contact with said cavity surfaces to form said reflector when said shaped blank is retained in said cavity; means, on said blank and housing, for temporarily holding said shaped blank in said cavity while the die plunger is withdrawn to prevent displacement of said shaped blank from said cavity; means for retaining said shaped blank in said cavity, said retaining means including a cover plate member being attachable to said housing for covering said open end of said cavity; a light emitting strobe tube configured to be located at a predetermined position relative to said formed reflector; and means for locating said strobe tube at its said predetermined position and retaining it thereat.
Claim 2
Dependent Claim
212 words
A strobe lighting unit including a reflector having a generally concave predetermined shape, said lighting unit comprising: a housing having an open ended cavity therein defined by surfaces which when engagingly contacted by reflective material support said material to form a reflector having said predetermined shape; a thin, substantially planar blank of bendable light reflective material having an initial shape that is formed into said predetermined shape in response to pressing said blank into said cavity with a conforming die plunger and having residual tension forces induced therein, as a result of such formation, that urge said material into contact with said cavity surfaces to form said reflector when said shaped blank is retained in said cavity; means, on said blank and housing, for temporarily holding said shaped blank in said cavity while the die plunger is withdrawn to prevent displacement of said shaped blank from said cavity; means for retaining said shaped blank in said cavity, said retaining means including a cover plate member being attachable to said housing for covering said open end of said cavity; a light emitting strobe tube configured to be located at a predetermined position relative to said formed reflector; and means for locating said strobe tube at its said predetermined position and retaining it thereat.
Claim 3
Dependent Claim
50 words
The lighting unit of claim 1 wherein said blank is formed from a metal foil having sufficient thermal mass so that when it is formed into said reflector and is in contact with said cavity surfaces it serves as a heat transfer member for directing said heat to said housing.
Claim 4
Dependent Claim
47 words
The lighting unit of claim 1 wherein said housing has at least one opening in one of said cavity defining surfaces and said blank is initially planar and has a corresponding barb therein which protrudes into said opening to temporarily hold said shaped blank in said cavity.
Claim 5
Dependent Claim
72 words
The lighting unit of claim 1 wherein said housing includes a pair of opposed walls having openings therein through which said tube extends to locate it at its said predetermined position and said tube retaining means includes a pair of compression collars on said walls adjacent said openings and a pair of elasticized grommets that are slipped onto the opposite ends of said tube and are compressively received in said compression collars.
Claim 6
Dependent Claim
36 words
The lighting unit of claim 1 wherein said cover plate member engages edges of said shaped blank adjacent said open end and applies a compressive force to said shaped blank to urge it into said cavity.
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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |