JPS6339698Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a front cover mounting structure for a camera with interchangeable lenses.

As shown in FIGS. 1 and 2, a conventional camera 1 with interchangeable lenses includes a camera body 2 which has a built-in cylindrical mirror box 8 and into which photographic film is loaded. is covered by the upper cover 3. Various mechanisms and parts such as a shutter mechanism, a movable reflection mirror, and an automatic exposure control mechanism are incorporated inside the mirror box 8. Some of the components, such as the contact 40 of the automatic exposure control mechanism, are connected to the mirror box 8. The front end of the camera body 2, that is, the part that protrudes forward from the front surface of the camera body 2, is incorporated into the component mounting hole 41 provided on the circumferential surface of the front end of the camera body 2, and if necessary, an appropriate tool can be inserted into the component mounting hole 41 from the outside. Adjustment by plugging in the
The mirror box 8 is replaceable, and the outer peripheral surface of the front end of the mirror box 8 is usually covered with a front cover 6 to protect the contacts 40 and the like and prevent them from being seen from the outside. The front surface of the mirror box 8 constitutes an interchangeable lens mounting section by fixing the mount 4 with a plurality of set screws 5, and an interchangeable lens (not shown) is detachably mounted to this mounting section. .

However, since the front cover 6 is disposed by being inserted into a groove 42 formed between the front surface of the mirror box 8 and the mount 4 as shown in FIG. If the camera is damaged during use, or if the contacts 40 or the like are to be adjusted or replaced, it is necessary to remove the mount 4 located at the front of the camera and then remove the front cover 6. In particular, once the mount 4 is removed, it is fixed with a plurality of setscrews 5 when reattached, so that the distance from the front of the mount 4 to the mirror 9 provided at the back of the mirror box 8, as shown in FIG. Since the distance L (commonly known as flange back) and the distance to the focusing glass 10 change, the film surface focus and the viewfinder focus are thrown out of focus, making installation adjustments even more complicated, which has the disadvantage of significantly increasing assembly, processing, and repair costs. Ta.

In addition, since the front cover 6 is attached with its upper surface facing the lower surface of the upper cover 3, the front cover 6 and the upper cover 3 should be aligned to prevent the joint surface 7 from shifting or lifting. Therefore, installation and adjustment were extremely troublesome.

The present invention was developed in order to solve the above-mentioned drawbacks.The front part of the upper cover protrudes forward from the front of the camera body, and the upper part of the outer peripheral surface of the front end of the mirror box is covered with this protrusion. The extending portion is integrally provided, and the front cover that covers the lower part of the outer peripheral surface of the front end of the mirror box is formed in a substantially semicircular shape,
By removably engaging this with the extension from below, the front cover can be attached and detached without removing the mount, and the camera can be repaired and assembled without disturbing the adjusted flange back and focus glass surface positions. To provide a front cover mounting structure for a camera that facilitates work, etc. and improves the appearance by eliminating the joint surface between the upper cover and the front cover that appears on the front of the camera.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 is an exploded perspective view showing an embodiment of the front cover mounting structure according to the present invention. In the drawings, the same reference numerals as in FIGS. 1 and 2 indicate the same components.

An upper cover 3 that covers the upper surface of the camera body 2 is integrally provided with a pentacover portion 31 protruding upward from the center thereof. The front part of this pentacover part 31 protrudes forward from the front surface of the camera body 2, and this protrusion part 32 extends downward along the outer peripheral surface of the front end of the mirror box.
Further, an extending portion 11 having a semicircular opening 33 opened downward and forward is integrally provided so as to cover the upper portion of the outer peripheral surface of the front end portion of the mirror box.

Connecting pieces 12a and 12b are integrally protruded from the lower end portions of both sides of the extending portion 11, and a screw hole 13 is provided approximately at the center thereof. In addition, since the extending portion 11 is formed in a shape that widens toward the end, that is, a trapezoidal shape when viewed from the front, and both left and right side surfaces are inclined, the extending portion 11 does not fit into the camera body 2 when assembled by fitting into the camera body 2 from above. The extension portion 1 is carefully removed so as not to damage the surface of the ribbon 14 that has been bonded.
An escape notch 15 is provided at the rear end edge that is in contact with the camera body 2 of the camera body 1. Note that 16 indicates a leather bonded to the camera body 2.

On the other hand, the front cover 17 attached to the front surface of the camera body 2 is formed in a substantially semi-cylindrical shape, that is, an arc shape that opens in the front-rear direction and upward, and the connecting pieces 12a of the upper cover 3,
Engagement recesses 18a and 18b into which the recesses 12b engage are formed, respectively. Therefore, in order to assemble the front cover 17 into the camera body 2, it is necessary to
Insert the front cover 17 from below in a direction perpendicular to the photographing optical axis center 20, engage the connecting pieces 12a and 12b into the engagement recesses 18a and 18b, and insert the front cover 17 into the holes 21a provided at both ends of the front cover 17. , 21b and screwing them in, the cover 17 is removably connected to the extension portion 11 of the upper cover 3. When the front cover 17 is assembled, its front edge 17a is inserted into the groove 42 provided between the front surface of the mirror box 8 and the mount 4, as shown in FIG. Covering the outer peripheral surface of the front end, contact point 40
etc. to protect.

Thus, according to the above configuration, the front cover 17 is formed into a semi-cylindrical shape, a part of the upper cover 3 is made to protrude to the front side of the camera body 2, and the front end outer peripheral surface of the mirror box 8 is attached to this protrusion. An extension part 11 that covers the upper part is integrally provided, and this extension part 11
In addition, the front cover 17 that covers the lower part of the outer peripheral surface of the front end of the mirror box 8 is removably connected, so that unlike the conventional structure, the joining surface of the front cover 17 and the upper cover 3 is connected to the front of the camera. It does not appear on the screen or spoil the appearance, and installation and adjustment work can be performed more easily.

Furthermore, since the front cover 17 is removed from the upper cover 3 below the camera body 2 by removing the setscrews 22, it is necessary to assemble and adjust the contacts 40 etc. shown in FIG.
There is no need to remove the mount 4 from the front of the mirror box 8 during replacement, and therefore the position of the flange back and the focusing glass 10 will not be disturbed.

Note that when the front cover 17 is attached to the top cover 3, joint surfaces 23 will be formed on both sides of the front cover 17, and it is expected that this will cause misalignment. The surface 23 may be covered with a leather 24.

Further, this joint surface 23 may not be straight but may be oblique. Furthermore, without using the locking means by the setscrew 22, for example, as shown in FIG. At the same time, a joining groove 2 is formed on the back surface of the tip end of the extension part 11 of the upper cover 3.
5, and the claw 24 may be fitted into the joint groove 25 by utilizing the elasticity of the front cover 17 and the extension portion 11. In this case, by applying the elastic force of the extending portion 11 of the upper cover 3 in the direction of arrow A and the elastic force of the front cover 17 in the direction of arrow B, the connection between the two can be made stronger.

FIG. 6 is a perspective view showing another embodiment of the present invention.
The front cover 17 is integrally formed with a lower cover 30 attached to the lower side of the camera body 2. According to such a configuration, the number of parts can be substantially reduced by one, and manufacturing and assembly operations are simplified, so there is an advantage that costs can be reduced. Further, in this case, since the lower cover 30 is screwed to the camera body, the upper cover and the front cover simply connect the connecting protrusions of the extension to the engaging recesses 18a, 1.
8b, it is possible to eliminate locking means such as screws.

In the above embodiment, the front cover is formed into a substantially semicircular shape, and the joint surface with the extension part of the upper cover is provided near the center of the photographing optical axis. The bonding surface may be located at a position vertically shifted from the position shown in FIG.

As explained in detail above, according to the present invention, the front cover is formed by a semi-cylindrical member that is assembled from below to the extension part of the upper cover, and this is removably connected to the front end of the mirror box. Since the front cover is configured to cover the lower part of the outer peripheral surface, the internal mechanism can be adjusted by removing only the front cover without removing the mount during assembly, adjustment, repair, etc. Therefore, complicated adjustment work for adjusting the distance from the front of the mount to the film surface and the focusing glass, which was conventionally performed during assembly, adjustment, and repair, is no longer necessary, and out-of-focus can be prevented.

Furthermore, since the originally existing upper cover is used, there is an advantage that the number of parts can be reduced.
Furthermore, since the front cover is engaged with the upper cover at the side, no joint surface appears on the front of the camera body, so there is no need to spoil the appearance.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a conventional front cover mounting structure, Fig. 2 is a schematic diagram showing the internal structure of a camera, Fig. 3 is an exploded perspective view showing an embodiment of the present invention, and Fig. 4 is a front view showing an example of a conventional front cover mounting structure. FIG. 5 is a perspective view of the entire camera, FIG. 5 is a side view of main parts showing another coupling structure between the front cover and the upper cover, and FIG. 6 is a perspective view showing another embodiment of the present invention. 2...Camera body, 3...Top cover, 4...Mount, 8...Mirror box, 11...Extension part, 17...Front cover, 22...Set screw, 30
...Lower cover, 31...Penta cover, 32...
Projection, 33...opening.

Claims (1)

[Scope of utility model registration request] In a camera in which a pentacover part 31 is integrally provided in the center of an upper cover 3 that covers the top surface of the camera body 2, the front part of the pentacover part 31 is made to protrude forward from the front surface of the camera body 2, and this protrusion A portion 32 of the mirror box 8 projects forward from the front surface of the camera body 2 and extends downward along the outer peripheral surface of the front end portion of the mirror box 8 to which the mount 4 is attached. An extension part 11 having a semicircular opening 33 opened downward and forward is integrally provided so as to cover the upper part of the outer circumferential surface of the front end, and the front cover 17 is attached to the lower part of the outer circumferential surface of the front end of the mirror box 8. The front cover 17 is formed into a substantially semi-cylindrical shape that opens upward and in the front-rear direction so as to cover the front cover 17, and both upper ends of the front cover 17 are detachably attached to the extension part 11 of the upper cover from below. Camera front cover mounting structure.