Oblique viewing optical system for endoscopes

Details Oblique viewing optical system for endoscopes Oblique viewing optical system for endoscopes

1984-12-27

1987-04-07

Corbin, John K.

350 9626, 350447, G02B 2302, G02B 2326, G02B 1700

Patent

active

046555579

ABSTRACT:
An oblique viewing optical system for endoscopes wherein, in order to make it easy to work and assemble the component parts and to reduce the light amount loss, a visual field direction changing prism is formed of a first prism and second prism, the first prism is so arranged that its entrance surface intersects at right angles with the visual field direction, the second prism is so arranged that the first reflecting surface is parallel with the axis of the endoscope and the second reflecting surface cemented to the first prism through a cementing agent intersects at an acute angle with the above mentioned axis and the angle made by the above mention first reflecting surface and visual field direction, the refractive index of the cementing agent and the refractive index of the first and second prisms are made to meet a predetermined condition.

REFERENCES:
patent: 4138192 (1979-02-01), Yamasita
patent: 4515444 (1985-05-01), Prescott et al.

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