JPH01282525A - Finder device using roof type reflecting mirror - Google Patents

Abstract

PURPOSE:To hold a protection cover at a prescribed interval by utilizing the space above the roof type reflecting mirror as the arrangement space for a flexible substrate where electrical equipment is mounted. CONSTITUTION:The protection cover 15 which is a metallic thin plate consists of a roof part consisting of roof surfaces 15f and 15g and their intermediate area 15h and side walls 15a and 15b for supporting them, and legs 15k, 15l, and 15m for clamping the protection cover 15to a camera body with a pentagonal holder 9 and screws are formed at the lower ends of the side walls 15a and 15b by press working. The space between the protection cover 15 and the upper cover of the camera body is used as the arrangement space for the flexible substrate where an IC, etc., is mounted, but the protection cover 15 made of the metallic thin plate is used and connected to an earth circuit, so noises generated by a mirror driving mechanism are cut off effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a finder device using a roof-type reflector, and more particularly to a protective cover for protecting the roof-type reflector.

Conventional technology In recent single-lens reflex cameras that have become smaller and lighter, C places a flexible board with electronic components such as ICs in the space between the top of the pentaprism, which has a relatively large area, and the top cover of the camera. It is common to do so.

In addition, in a single-lens reflex camera using a roof-type reflector, a flexible substrate was placed in the space between the top of the roof-type reflector and the top cover of the camera, as in the case of a pentaprism. No. 49424.

Problems to be Solved by the Invention However, unlike conventional glass pentaprisms, roof-type reflectors are manufactured by molding, and therefore have the disadvantage of being easily deformed when external forces are applied to them. In particular, if the desired accuracy cannot be obtained in the roof part of the roof-type reflector, the image obtained by the finder device will widen, narrow, or distort, resulting in abnormal and unusual viewing. .

Therefore, if a flexible substrate is placed directly on top of the roof-type reflector, there is a risk that when the top cover of the camera is placed on the camera, the roof portion will be pressed and a normal finder image will not be obtained.

An object of the present invention is to prevent external forces from being applied to the roof-type reflector even when the flexible substrate is placed in the space between the top of the roof-type reflector and the top cover of the camera. The object of the present invention is to provide a finder device using a roof-type reflector.

Means for Solving the Problems In order to achieve the above object, the finder device of the present invention covers the roof-type reflector with a protective cover, and uses the space between the top of the roof reflector and the top cover of the camera body as a space for arranging a flexible board. . That is, the protective cover was maintained at a predetermined distance from the roof-type reflector at a predetermined distance from the roof-type reflector so that the roof-type reflector and the sidewalls of the protective cover did not come into contact with the roof-type reflector.

Therefore, the flexible circuit board will press the protective cover with the top cover of the camera, but since the protective cover and the roof-type reflector are placed at a predetermined distance without contacting each other, the flexible circuit board will press against the protective cover. The board does not press against the roof reflector.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a complete assembled product of a finder block according to the present invention, FIG. 2 is a block diagram thereof, and FIG. 3 is a view showing the main components shown in the block diagram of FIG. 2 from different angles.

A roof-type reflecting mirror (has two reflective surfaces intersecting at right angles on the inner surface, a roof surface (l'), (1g), and side walls (la), (lb) that hold the roof surface. posterior end (IC).

It is composed of 6 sides of the earth wall part (1d), and the rear wall part (I
C) has an eyepiece frame (1e) and an opening (lh) for passing the photometric light beam through the side wall part (la), and the lower end of (lb) has feet (lk) for attaching to the penta holder f9). (17) is
Also, the roof surface (If), (Ig) and the side wall (la), (1
b).

At the front end, there is a reflector on the roof surface (1fL (Ig)
A second reflector (2) reflects the light guided forward to the eyepiece.
), and the upper part of the eyepiece frame (le) has a notch (1n) (lj ).

It is divided into two parts (1k), and a boss (1i) for positioning the attachment of the photometric lens holder (4) is integrally molded in (1j).

(3) is a plastic eyepiece, and the flanges (3a) protruding toward the left and right edges have an abutment surface (3b) perpendicular to the optical axis and a projection (3C) on the opposite side. It is shaped like a bell.

(4) is a photometric lens holder, the bottom surface (4a) has a long hole (4E), the front surface (4b) has a photometric aperture (4d) and a light shielding eaves (4e), and the rear surface (4C) has nail-like process (
4g) are integrally molded, one on each side. The front of this photometric lens holder (4) (
A photometric lens (5) is fixed to the inside of the rear surface (4b).
4C) is a board (6) on which a photometric element (not shown) is mounted.
) is mounted in an adjustable position by means of an eccentric pin (7).

(8) is a noise shield plate, and as shown in Figure 1, the photometric lens holder (
4).

(9) is a penta holder with a mounting hole (
9a) and mounting feet (lk) for the roof-type reflector (1).

There are holes (9k) and (97) for the light beams to pass through, and an opening (9c) for letting the finder light beam pass through.

The edge portion (9b) of the aperture (9c) forms a viewing frame.

(13) is a focus plate, which is attached to the penta holder (9) by a focus plate holding spring (14). (12)
is a light emitting device for display in the viewfinder, (10) is a light guide such as a prism, (11) is a display film compatible with the display in the viewfinder, and Isun also has a penta holder (9).
).

The protective cover (15) is a thin metal plate, and the roof surface (15f) and (15
g) and a roof section consisting of a region (15h) sandwiched between the roof surfaces, and a side wall (15a) that supports and supports the roof section, (1
5b) and is composed of C, 11111 wall (zsa),
Qsb) At the bottom end, there is a foot (15) for aligning the protective force - (15) to the camera body with a penta holder ■) and a screw.
k), (15ri), and (tsm) are each processed using a press.

Next, the protective cover (15) will be explained.

The space between the protective cover (15) and the upper cover of the camera body is a space for arranging a flexible board on which ICs and the like are mounted. In a camera that uses many plastic parts, noise is generated from the mirror drive mechanism, etc., and ICs etc. mounted on the flexible substrate may malfunction. In this example, the protective cover (1
Since a thin metal plate is used for 5), the protective cover (1
By connecting 5) to the ground circuit, a noise shielding effect can be obtained. Specifically, the protective cover (15) may be electrically connected to a metal front frame or the like using screws or lead wires. Furthermore, although the roof-type reflector (1) generally has the disadvantage of being susceptible to heat, the presence of the protective cover (15) makes it possible to solder the conductive pattern on the flexible board.

The shape of the first embodiment of the protective cover (15) is shown in FIG. FIG. 4(b) is a sectional view taken along line EE in FIG. 4(a). Roof part (15f), (15g) of protective cover (15)
are parallel to the roof surfaces (If) and (Ig) of the roof-type reflector (1), respectively, and both are at a constant temperature of °C over the entire surface.
The smaller the uniform gap is, the larger the space for placing the flexible substrate on the protective cover (15) will be, but it is determined within a range that does not impair assembly workability. Specifically, 1 is about 1 to 15 liters.

FIG. 5 shows a second embodiment of the protective cover (15), and FIG. 5 (ri) is a view of the protective cover (15) seen from the rear. The front where there is less space for flexible circuit boards (・
・The mounting part) is designed to reduce the gap between the protective cover (15) and the roof (1f) and (Ig) of the roof-type reflector (1), but it is installed at the rear where there is relatively plenty of space for placing the flexible board. Since the gap becomes thicker toward the eyepiece side, a space for arranging the flexible circuit board can be secured, and the ease of assembly is comparable to that of the embodiment shown in FIG. Specifically, the protection jy /Z-(15) (
7) Roof surface (15f), (15g) TV ridgeline (15X
) with the horizontal is the roof surface (
1f), 01>θ15 should be satisfied compared to the angle σ1 formed by the ridgeline (1x) of (xg) with the horizontal.

FIG. 6 shows a third embodiment of the protective cover (15), and FIG. 6(b) is a view of the protective cover (15) seen from the rear. The roof surface (15f) of the protective cover (15) shown in Figure 5
), (15g), the angle made with the horizontal is the roof ridge of the roof-type reflector (1)! The surface (15
h) is further provided. Generally, the upper part of the camera body's upper cover (18) on the eyepiece side has a lowered part (18a) for attaching an accessory shoe, so if you use the protective cover (15) shown in Figure 6, This eliminates the need to unnecessarily increase the overall height of the camera, resulting in excellent assembly workability and space efficiency for flexible board placement.

It is of course possible to arrange a buzzer, various operation switches, an LCD, a solar cell, etc. in the space between the protective cover (15) and the upper cover of the camera body instead of the flexible board.

Effects of the Invention As has been explained in detail above, according to the present invention, since the roof-type reflector is protected by a protective cover, it can be used similarly to the conventional finder device using a glass pentaprism.
The upper part of the roof-type reflector can be effectively used as a space for arranging flexible printed circuit boards equipped with electrical components. The protective cover does not come into contact with the roof reflector.
Since they are maintained at a predetermined interval at °C, a finder image with the desired precision can be obtained without the flexible substrate pressing against the roof-type reflector.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of a finder block of a finder device according to the present invention, FIG. 2 is a configuration diagram of the finder block shown in FIG. 1, and FIG. FIG. 4(a) is a side view showing another embodiment of the finder block, FIG. 4(b) is a perspective view from an angle of
5(a) is a side view showing a different embodiment of the finder block from FIG. 4, (b)
is a rear view of the protective cover in (a), Figure 6 (a) is a side view showing a different embodiment of the finder block from Figures 4 and 5, and (b) is a rear view of the protective cover in (a). - is a rear view. DESCRIPTION OF SYMBOLS 1... Roof-type reflective mirror, 1f, 1g... 1st roof part, 1allb... 1st side wall part 15... Protective cover, 15f, 15g... 2nd roof part, 15a , 15b... second side wall portion. Applicant Minolta Camera Co., Ltd. Figure 2 Figure 3 Figure 4 (ゐ) (b) Figure 5 (a) 1 (b)

Claims (1)

[Claims] 1. A roof-type reflecting mirror in which a first roof part having two reflective surfaces intersecting at right angles and a first side wall part holding the roof part are integrally formed by molding. , a second roof part that covers the first roof part, and a second side wall part that covers the first side wall part and holds the second roof part, and can be moved to a predetermined position without contacting the roof-type reflecting mirror. A roof-type reflector is used, which is characterized by comprising: a protective cover held at a distance of Finder device. 2. The roof-type reflector according to claim 1, wherein the protective cover is fastened together with the penta-holder to the camera body by screws through the mounting hole of the penta-holder to which the roof-type reflector is attached. Finder device. 3. The finder device using a roof-type reflector according to claim 1, wherein the protective cover is a thin metal plate and is connected to a ground circuit.