Finder device for a camera

Details Finder device for a camera Finder device for a camera

1995-02-24

1996-09-10

Gray, David M.

G03B 1308

Patent

active

055554687

ABSTRACT:
A finder device using a pentagonal mirror is constructed so that it does not experience clouding, condensation, or oxidation. The finder device (1) comprises a first reflection component (4) having at least two reflective surfaces (6a and 6b) which intersect at substantially right angles. The surfaces reflect the light which passes through at least one of the focus plate (2) and the condenser lens (3) of a camera. A second reflection component (8) reflects the light rays reflected to it by the first reflection component (4) to an eyepiece optical system (11). The space formed between the first and second reflection components (4 and 8) and either the condenser lens (3) or the focus plate (2) or both is filled with an inactive gas. This inactive gas helps prevent clouding, condensation, or oxidation.

REFERENCES:
patent: 4206991 (1980-06-01), Kobori et al.
patent: 4289392 (1981-09-01), Kobori et al.
patent: 4926208 (1990-05-01), Teramoto et al.
patent: 4974014 (1990-11-01), Teramoto et al.

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