Improved mirror box construction to ensure accurate assembly thereof

#1. Field of the Invention

#This invention is related to the structure of a mirror box to be installed in a camera.

#2. Description of Related Art

#The invention will be described in detail with reference to the following drawings in which like reference numerals refer to like elements and wherein:

#FIGS. 1A-1C show the main body of a mirror box according to the invention, with FIG. 1A being a top view, FIG. 1B being a front view, and FIG. 1C being a bottom view;

#FIGS. 2A-2C show the main body of the mirror box according to the invention, with FIG. 2A being a side view of the film rewinding mechanism side, FIG. 2B being a back view, and FIG. 2C being a side view of the film winding mechanism side;

#FIGS. 1-3 show an embodiment of the main body of mirror box in accordance with this invention, which preferably is made of a resin material. The main body of the mirror box in this description refers to a unit containing the mirror box section, the shutter plate section and the lens mount seat section.

#FIGS. 1A-1C and FIGS. 2A-2C are views of the main body of the mirror box from all six sides. In this example, the main body of the mirror box is created as a unit in such a way that the central position of the lens mount section, the central position of the mirror box section and the central position of the inlet opening (to be explained later) provided in the shutter plate section coincide.

#FIG. 1A is a top view of the main body of the mirror box. Inside of the mirror box section 53, the side as well as the bottom surfaces are equipped with light shielding lines as shown in the drawing. Furthermore, a movable mirror (not shown) and a sub mirror (not shown) are placed inside the mirror box section. In the rear portion of the mirror box section 53, the top surface 54 of a shutter plate, which is integrated with the mirror box, is shown. In the front portion of the mirror box section, the top surface 55 of the lens mount seat section, which is integrated in the mirror box, is shown. The top surface 56 of the mirror box is a surface on which a prism box (not shown) and a component of the viewfinder optic system, is secured.