Photoflash projection device and a method of using the device
AssigneeCody Manufacturing Company, Inc.
InventorJames R. Palmieri
Life of this patent
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Abstract
A Photoflash Projection Device and a method of use includes a linear discharge tube in an elongated concave reflector, powered by a self-contained multiplying circuit. The reflector, having a predetermined shape to include a Natural Log Function, novelly projects and spreads a uniform light density over a wideangle/graduated depth area. This permits a user to direct light above the field's rearground to achieve the ideal photographic illumination. The flash unit further includes a support stand mounting bracket that is adjustable relative to the base of the housing. The invention is particularly suited for large Group/Commercial photography.
Claims14
A photoflash projection device comprising:
- a housing defining an interior space and having an exterior surface;
- a multiplying circuit for receipt into the interior space of the housing;
- and
- a lamp, the lamp for engaging the housing and multiplying circuit, the lamp comprising:
- a straight, elongated, glass, gas-containing, flash discharge tube having a first end and second end, the two ends engaged in gas sealing relation by two electrodes;
- a reflector surface, the reflector surface adjacent and parallel to the straight flash discharge tube, the reflector surface having a profile defining a natural log function in a plane with a longitudinal axis of the reflector surface parallel to the longitudinal axis of the tube the profile between a maximal profile defined by Y=8.98 LN (X−6)+2.34 and a minimum profile defined by Y=5.58 LN(X−6)+1.30;
- and
- a pair of side reflector plates located at two removed ends of the reflector surface, whereby said multiplying circuit engages the tube to intermittently apply a potential difference across the electrodes of the tube sufficient to create a flash discharge therefrom.
A lamp for use in a photoflash projection device having a housing and a multiplying circuit, the lamp comprising:
- a straight elongated, glass, gas-containing, flash discharge tube having a first end and second end, the two ends engaged in gas sealing relation by two electrodes;
- a reflector surface, the reflector surface adjacent and parallel to the straight flash discharge tube, the reflector surface having a profile defining a natural log function in a plane with a longitudinal axis of the reflector surface parallel to a longitudinal axis of the tube the profile between a maximal profile defined by Y=8.98 LN (X−6)+2.34 and a minimum profile defined by Y=5.58 LN(X−6)α1.30;
- and
- a pair of side reflector plates located at two removed ends of the reflector surface whereby the multiplying circuit engages the tube to intermittently apply a potential difference across the electrodes of the tube sufficient to create a flash discharge therefrom.
Dependencies are inferred from the claim text.