Optical: systems and elements – Single channel simultaneously to or from plural channels – By surface composed of lenticular elements
Patent
1991-06-11
1992-01-14
Arnold, Bruce Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By surface composed of lenticular elements
359741, 354200, G02B 502, G02B 1302
Patent
active
050815458
ABSTRACT:
A focusing screen for use in the finder system of a camera such as a single-lens reflex camera, and a method of forming a microstructure array suitable for use in the production of such a focusing screen. The focusing screen includes an optical material in plate form having on one surface a plurality of small lens portions that project in a regular array of equilateral triangles from the optical material and each of which has concentric contour lines, with a central apex. A flat portion is formed between adjacent small lens portions and a constricted portion is formed in the middle portion of the inclined surface of each small lens portion, with an irregular pattern of finer asperities is formed on the surfaces of the small lens portions and the flat portion. The high and low spots can be reversed. The method of forming a microstructure array includes the steps of forming a fine pattern of elements on a layer of light-sensitive material capable of transforming a distribution of light intensity to a surface relief by exposing the layer through a microlens array to rays of light with an intensity distribution corresponding to individual elements of the fine pattern. The microlens array may be replaced with a group of pinholes.
REFERENCES:
patent: 3128924 (1965-11-01), Miller
patent: 4071292 (1978-01-01), Ise et al.
patent: 4421398 (1983-12-01), Suzuki et al.
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patent: 4567123 (1986-01-01), Ohtaka et al.
patent: 4703405 (1987-10-01), Lewin
"Investigation and Application of Photographic Micro-Lenticular Rasters", Deml et al. Optik 37 pp. 439-450, Sep. 1972.
Shirayanagi Moriyasu
Sugawara Saburo
Takahashi Toshiharu
Yuda Hideaki
Arnold Bruce Y.
Asahi Kogaku Kogyo K.K.
Parsons David R.
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