Viewfinder
AssigneePENTAX Corporation
InventorIsamu Hirai
Life of this patent
Estimating the term…
Abstract
A viewfinder includes a focusing screen, an optical system having a ridge which is formed by cementing a pair of reflecting surfaces to each other; and an eyepiece, wherein an object image which is formed on the focusing screen is viewed through the eyepiece via the optical system. The ridge is provided at a position in which a line projecting the ridge on the focusing screen is shifted from a central position of the focusing screen so that a light ray which travels on an optical axis passing through a center of the focusing screen is incident on one of pair of reflecting surfaces and is not incident on the ridge.
Claims10
A viewfinder comprising:
- a focusing screen;
- an optical system having a ridge which is formed by cementing a pair of reflecting surfaces to each other;
- and
- an eyepiece,
- wherein an object image which is formed on said focusing screen is viewed through said eyepiece via said optical system, and
- wherein said ridge is provided at a position in which a line projecting said ridge on said focusing screen is shifted from a central position of said focusing screen so that a light ray which travels on an optical axis passing through a center of said focusing screen is incident on one of said pair of reflecting surfaces and is not incident on said ridge.
A viewfinder comprising:
- a focusing screen,
- an optical system;
- and
- an eyepiece,
- wherein an object image formed on said focusing screen is viewed through said optical system and said eyepiece,
- wherein said optical system is positioned relative to said focusing screen so that a center of said focusing screen and a ridge between a pair of reflecting surfaces of said optical system do not lie in a common plane orthogonal to a plane in which said focusing screen lies.
Dependencies are inferred from the claim text.