JPS5852519U - Magnifier built-in magnifier for single-lens reflex cameras - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

1, 3, 5, and 7 are sectional views of finder optical systems according to different embodiments of this invention, and FIG.
FIG. 4 is a view showing the viewfinder field of view according to the embodiments of FIGS. 1 and 3, respectively, and FIG. 6 is a view showing the viewfinder field of view according to the embodiments of FIGS. 5 and 7, respectively. 2... Focus plate, 4... Pentaprism, 6... Eyepiece, 8... Distance measuring section,
10.10'... Reflective imaging member, 12a, 12
b, 12'a, 12'b, 14... Reflective surface,
16... Magnifying lens.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Above or below the eyepiece so that the luminous flux that has come out from the distance measuring section at the center of the focus plate and passed through the pentaprism is reintroduced into the pentaprism from its rear exit surface. A reflective imaging member is provided so that an approximately equal magnification image of the distance measuring section is created on the front side of the pentaprism and near the lower or upper part of the front surface through an appropriate optical path, and the imaging lens is After the axial light passes through the distance measuring section, it is arranged so that it comes between the optical axis of the reflective imaging member and the optical axis of the eyepiece, and between the rear exit surface of the pentaprism and the eyepiece. , a magnifying lens is provided near the bottom or top of the front reflective surface of the pentaprism to magnify the approximately 1-magnification image of the distance measuring section and make it appear in the viewfinder field of view;
The light beam that has come out of the recording distance measuring section and is reflected by the reflective imaging member is further reflected by the normal to the vertical plane that includes the pair of Guha reflective surfaces of the pentaprism and the roof ridgeline of the pentaprism before reaching the magnifying lens. A viewfinder with a built-in magnifier for single-lens reflex cameras configured to reflect light from an odd number of reflective surfaces. 2 By changing the angle between the roof ridgeline of the pentaprism and the front reflective surface from 45°, the axial light of the photographing lens passes through the distance measuring section and then passes along the optical axis of the eyepiece lens to the optical axis of the reflective imaging member. A finder with a built-in magnifier for a flex camera, as set forth in claim 1 of the utility model registration claim, which is located between. 3 By imparting a declination angle to the distance measuring section, the axial light of the photographing lens is placed between the optical axis of the reflective imaging member and the optical axis of the eyepiece after passing through the distance measuring section. A finder with a built-in magnifier for a single-lens reflex camera according to claim 1 of the utility model registration claim. 4.A request for utility model registration in which a mask is formed on the lower or upper part of the front reflective surface of the pentaprism to limit the size of the image of the above-mentioned distance measuring section formed in the vicinity, or a vapor deposition restriction is made. A finder with a built-in magnifier for a single-lens reflex camera according to any one of items 1 to 3.