Patent
1983-05-18
1985-10-08
Mathews, A. A.
354150, 350171, G03B 4100
Patent
active
045456623
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to apparatus which permits taking of photographs of the type called "identity" by means of a single lens camera apparatus, preferably having instantaneous development, by addition of an optical assembly capable of forming in front of the lens of said apparatus a plurality of virtual images of a same object located in front of said optical assembly, in order to obtain for each shutter release of said apparatus a plurality of images on the film.
Single lens apparatus which permits obtaining a plurality of images of a same object by addition of a system of mirrors placed in front of the lens are known and utilized for a long time namely to effect pairs of stereoscopic photographs. Such systems always comprise 2N mirrors to effect N images, these mirrors moreover are immobilized following 2N distinct planes.
English patent No. 1.047.511 describes such an apparatus utilizing eight plane mirrors oriented according to eight distinct directions to lead in cooperation with the camera apparatus to the formation of four images on sensitive film. Systems of this type, due to the spacing of the exterior mirrors, give images which correspond to different observation angles, and as a consequence, to a different view orientation on each of the four photographs of a same series, contrary to that which is expected of such a system.
The present invention is essentially characterized by the fact that it reduces from 2N to N+1 the number of optical elements necessary in the formation of N intermediary virtual images, while reducing the differences of observation angles indicated above in such a way, that their effects are almost no longer discernable on the photographs of a same series. According to the invention, 2N mirrors of the prior Art are replaced by N mirrors operating in combination with a partially transparent mirror (element having at the same time the capacity of reflecting a part of the light received in the manner of a mirror, and of transmitting the rest without angular deviation in the manner of a transparent blade having parallel faces: thus it is a question in fact of a partially transparent mirror). The apparatus according to the invention simultaneously exploits the reflection and transmission capacities without deviation of a partially transparent mirror to effect a particular combination wherein Men of the Art will understand easily by reading the description which follows, for which reasons it is particularly advantageous. The act of reducing from 2N to N+1 the number of optical elements to be used, in itself is particularly advantageous in that it simplifies the operations of mounting and adjusting of the system.
In equipment for identity photographs functioning without an operator, where the subject himself must effect his framing, the camera assembly is fixed, and the subject must modify the height of the seat to assure a good framing in height, moreover this seat fixes the transversal framing as well as the predetermined distance between the subject and said camera assembly, thus it cannot be moved following one or the other of the two directions of the horizontal plane and is an integral part of the equipment. In reality, the adjustment of this seat frequently leads to several attempts, fastidious for the subject himself as well as for people who, sometimes, form a waiting line. Another characteristic of the apparatus according to the invention tends to facilitate the above preliminary adjustments, it resides in the combination of three means permitting a particularly easy and rapid adjustment of the framing and of the distance while eliminating the necessity of a fixed seat associated with this system.
The first means is a suspension system of the camera assembly permitting at the same time modifying the orientation of this assembly, which permits effecting the framing in height and in width, and modifying the distance between the camera assembly and the subject; it comprises an assemblage of cardan-type (wherein one axis is vertical and the other horizontal), connecte
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patent: 1456425 (1923-05-01), Procoudine-Gorsky
patent: 1988882 (1935-01-01), Thomas
patent: 2530793 (1950-11-01), Thomas
patent: 2751826 (1956-06-01), Harrison
patent: 3653748 (1972-04-01), Athey
patent: 3905684 (1975-09-01), Cook et al.
Greigg Edwin E.
Mathews A. A.
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