Optical: systems and elements – Lens – With support
Patent
1991-05-03
1992-10-20
Ben, Loha
Optical: systems and elements
Lens
With support
359823, G02B 702
Patent
active
051575540
ABSTRACT:
An optical coupling system in which the space between a CRT and a projecting lens, both of which are optically coupled together, is filled with a specific liquid has been employed in the optical system of a projection-type television. In such a system an increase in the temperature of the CRT increases causes the temperature of the specific liquid or optical coupling liquid to increase, resulting in a variation in the refractive index of the liquid which causes a projected image to be defocused. In order to correct such a defocusing of the image, a single lens in contact with the liquid is allowed to move by a small amount in the optical axis direction. In other words, the external periphery of the signal lens is supported by a layer composed of a rubber-like elastic body. In such an arrangement, the volume expansion of the liquid can be utilized to move the single lens by a small amount. The defocusing of the image is thus corrected. A pressure-control system is also provided for controlling an increase in pressure caused by a volume expansion of the liquid inside the space, which is closed in a watertight condition.
REFERENCES:
patent: 3498695 (1970-03-01), Brouwer
patent: 3612664 (1971-10-01), Berman
patent: 4904054 (1990-02-01), Hiroshima
patent: 4919519 (1990-04-01), Fantozzi et al.
Ben Loha
Matsushita Electric - Industrial Co., Ltd.
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