Nova Patents
US2979601A

Photographic flash attachment

Abstract

This record has no abstract on file.

US2979601A, drawing sheet 1
Sheet 1 of 4

Term

Term ended

Expired 11 April 1978, 48.5 years ago.

  1. Priority and filed
  2. Granted
  3. Expired
  4. Today

3 claims: 3 independent, 0 dependent

  1. 1
    What is claimed is:1. A flash attachment comprising a photographic light reflector provided with a concave light-reflective surface, having an outer opening and having a light bulb centrally located therein with respect to said surface, and a shading filter supported from the reflector extending over a portion of the reflective surface in spaced relation thereto and outwardly of the bulb, the area of the filter being substantially less than the opening in the reflector so that a substantial portion of the reflective surface is uncovered, the filter having a broad base portion extending circumferentially over a portion of the rim of said lightreflective surface and having a portion tapered radially inwardly toward the bulb and covering at least a portion of said bulb, and the filter being of graduated density, the density increasing in a direction radially outwardly from the bulb so that light rays from the bulb may pass through the filter less readily in the region near the margin of the reflector, whereby light from the bulb may be reflected past the periphery of the filter in some areas and light may be filtered in the area of the filter to gradually lessen the illumination of a portion of the foreground of the subject.
  2. 2
    A flash attachment comprising a photographic light 2,979,601 PHOTOGRAPHIC FLASH ATTACHMENT 6 John V. McCIees, New Haven, Conn. (135 Treadwell St., Hamden, Conn.) Ffled Nov. 20,1957, Ser. No. 697,628 10 2 Claims. (Cl. 240—1.3) This invention relates to attachments for photographic 15 flash units. It is the purpose of this invention to provide small area control of the light intensity emitted by flash bulbs and their reflectors. Other objects of the present invention are to provide an 20 attachment for photographic flash units which is inexpensive in manufacture, completely controllable in density ratio, and mobile in its directional area. The problem which this device helps to solve has been intensified by automatic processing. No longer is it possi- 25 ble to dodge in too light areas on the print or transparency. Such control is not a part of automation. It therefore is necessary to shade light areas at the time of making the original exposure. This can be done with my shading filter. . 33 For a better understanding of the invention, reference may be had to the following detailed description in connection with the accompanying drawing, in which:Fig. 1 is a perspective view of a light filter embodying the invention and illustrating the filter in association with 35 a light reflector and a photographic flashbulb;Fig. 2 is a fragmentary elevational view partially in section illustrating the apparatus of Fig. 1;and Fig. 3 is a front elevational view of a modified form of the light filter, and showing the same in association with 40 a light reflector and a photographic bulb. Referring now to the form shown in Figs. 1 and 2 of the drawing, there is shown a conventional photographic reflector 10 and photographic flashbulb 11. In the illustrated practice of my invention a graduated filter, indicated generally at 12, of predetermined density ratio is attached to the rim of the reflector 10 constructed of ferrous material by means of a magnet 13. The base of the filter is provided with a strip 14 of cardboard on each side. This sandwich may be fastened together with glue. 5q A ferrous metal strip 15 is permanently secured in any suitable manner to one strip 14 for magnetic attraction to the magnet 13. This method of mounting allows the filter to be placed at any point along the 360 degrees of the reflector rim, thus giving mobile control of the grad- 55 uated shading of the filter. As shown, the photographic light reflector is provided with a concave light-reflective surface having an outer opening and the light bulb is located centrally with respect to the last-named surface. The filter 12, supported 6θ from a marginal portion of the reflector, extends over a portion of the reflector surface in spaced relation thereto and outwardly of the bulb, the area of the filter being substantially less than the opening in the reflector, so that a substantial portion of the reflective surface is uncov- 6g ered. The filter 12 has a broad base portion to extend over a portion of the rim of the light-reflective surface, and has a portion tapering radially inwardly toward the bulb to cover at least a portion of the latter. The filter is of graduated density, the density increasing in a direction radially outwardly from the bulb, so that light rays from the bulb may pass through the filter less readily in
  3. 3
    3,979,001 reflector provided with a concave light-reflective surface, having an outer opening and having a light bulb centrally located therein with respect to said surface and a shading filter supported from a marginal portion of the reflector, the filter extending over a portion of the reflective surface in spaced relation thereto and outwardly of the bulb, the area of the filter being substantially less than the opening in the reflector so that a substantial portion of the reflective surface is uncovered, the filter having substantially the shape of an isosceles triangle with the base thereof extending throughout a portion of the rim of said light-reflective surface, the apex of the triangle extending radially of the reflector and covering at least a portion of the bulb and the filter being of graduated density, the density increasing in a direction radially outwardly from the bulb so that light rays from the bulb may pass through the filter less readily in the region near the margin of the reflector, whereby light from the bulb may be reflected past the periphery of the filter in some areas and light may be filtered in the area of the filter to gradually lessen the illumination of a portion of the foreground of the subject. References Cited in the file of this patent UNITED STATES PATENTS 1,691,366 Ames_________________Nov. 13,1928 2,441,489 Jacobs________________May 11,1948 10 2,614,783 Spear__________________Oct. 21,1952 2,760,048 Schulte________________Aug. 21,1956 2,761,056 Lazo__________________Aug. 28,1956 2,772,498 Miles__________________Dec. 4, 1956 15 FOREIGN PATENTS 512,450 Great Britain___________Sept. 15, 1939 742,679 Great Britain___________Dec. 30, 1955
Independent claims3