Information indicating device in a camera viewfinder

Claim 1

An information indicating device for a viewfinder of a camera using a pentaprism of the type having a first transmission face for transmitting a real image formed thereon, first, second and third reflection surfaces for internally reflecting said real image, and a second transmission face for transmitting said real image reflected from said third reflection surface, said indicating device comprising: a thin, substantially triangular shaped prism element having a shape similar to the shape of a side face of said pentaprism and attached to the external surface of said side face and positioned to receive light information along one face of the triangular prism element, and a second thin prism means attached to the external surface of said third reflection surface and positioned to receive light information from said thin, substantially triangular shaped prism element, said third reflection surface being provided with a transparent slot within the effective reflecting area thereof, and said light information received by said thin, substantially triangular shaped prism element and transmitted to said second thin prism means being introduced into said pentaprism through said transparent slot by said second thin prism means.