JPS6131319Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is installed between the camera body of a camera with interchangeable lenses and a lens mounting member provided at the front end of the camera body to removably hold an interchangeable lens. This relates to improvements to the front cover.

Cameras with interchangeable lenses have a shutter mechanism,
A substantially rectangular parallelepiped camera body having a movable reflective mirror, a dark box, etc. is assembled, and then an interchangeable lens mounting portion for removably holding an interchangeable lens is fixed to the camera body. This interchangeable lens mounting part includes a transmission part for transmitting information such as the aperture value of the attached lens to the mechanism on the camera body side, and fine adjustment of this transmission part and the mechanism inside the camera body during assembly. Since adjustment mechanisms are provided for this purpose, these adjustment mechanisms are exposed after assembly is complete, damaging the overall appearance of the camera, and there is also the risk that these mechanisms may be damaged by physical impact due to collision or contact. There are other inconveniences. Therefore, a front cover has conventionally been provided on the front of the camera body to cover the transmission section and adjustment mechanism to prevent damage due to physical impact and to enhance the aesthetic appearance of the camera. However, in the conventional camera described above, the front cover is provided between a removable board on the front surface of the camera body and an interchangeable lens mounting member such as a lens seat plate, and the front cover is attached to the front cover by the lens mounting member. Since it is sandwiched between the lens mounting member and the substrate, it is necessary to remove the lens mounting member in order to attach or detach the lens mounting member, which causes various inconveniences.

That is, to explain the above-mentioned conventional example in detail, in FIG. 1, aperture information from a photographing lens is electrically transmitted to a substrate 1 which is fixed with screws or the like to a camera mechanism main body (not shown) having a substantially flat rectangular outer shell. An aperture information transmission section 2 made of a resistor for converting the resistance value into a specific resistance value is provided. The front cover 3, which is detachably fixed to the substrate 1, is formed in a shape to cover the aperture information transmitting section 2, and after being fixed to the substrate 1, the front cover 3 is attached to the front surface of the aperture information transmitting section 2, which is attached to the interchangeable lens. An aperture information transmitting ring 5 having a driven portion 4 that engages with the information transmitting member is brought into contact with the ring, and a bayonet seat plate 6 for removably holding an interchangeable lens is attached to the substrate 1 with screws on the front surface thereof. The aperture information transmission ring 5 is fixed to the substrate 1.
It is rotatably held between the The arrangement of these members is such that the front cover 3 is sandwiched between the base plate 1, the aperture information transmission ring 5, and the bayonet seat plate 6, as shown in FIG. 1B.

In the conventional device configured as described above, if the front cover is damaged during assembly or during camera use, or if the internal mechanism of the camera is When it is necessary to remove the front cover, such as when the front cover is used, it is necessary to remove the aperture information transmission ring 5, bayonet seat plate 6, etc. located on the front side. However, once these members are removed, the aperture information transmission ring 5 requires a troublesome connection work with the internal transmitted member, while the bayonet seat plate 6 has to adjust the distance from the front end surface of the seat plate to the film surface. This requires complicated adjustment work (so-called flange back adjustment work), which requires a lot of time and man-hours, which has the disadvantage of significantly increasing repair, assembly, and processing costs.

Furthermore, in the conventional configuration described above, when the camera is a single-lens reflex camera, the front plate is formed in a convex shape in order to ensure the rocking locus of the mirror section inside the camera body. When adjusting or repairing the drive unit, for example, if it is necessary to provide an operation hole to replace an air damper to reduce shock when driving the mirror, the front cover cannot be easily removed as described above. Therefore, the front cover cannot also be used to cover the operation hole, and in addition to the front plate, it is necessary to provide an extra cover that is easy to attach and remove to cover the operation hole, which reduces the number of parts. Also, there is a disadvantage that the number of work steps increases, further increasing manufacturing and repair costs.

The present invention was devised to solve the above-mentioned conventional drawbacks, and its purpose is to allow the front cover to be removed without removing the lens mounting member, such as the bayonet seat plate, which is provided on the front end side of the front cover. It can be easily attached and detached, eliminating the need for any adjustment work caused by removing these parts.
In addition to being able to reduce the number of man-hours, in the case where the front plate is provided with an operation hole for adjusting the internal mechanism,
It is an object of the present invention to provide a front cover that can cover the operation hole at the same time and reduce the number of parts, thereby reducing costs during repair and camera assembly.

An embodiment of the present invention will be described below with reference to FIG.

1 in the same figure showing a single-lens reflex camera.
Reference numeral 1 denotes a front plate that is attached to a camera body 12 formed into a substantially flat rectangular parallelepiped with screws, etc. The front plate 11 has a protrusion 13 formed in a protrusion shape to ensure a swing space for a well-known reflecting mirror. are integrally formed, and an operation hole 14 is provided on the outer circumferential side of the protrusion 13 for adjusting the mechanical or electrical circuit of the mirror drive section or the shutter mechanism. 13a is a flange portion integrally formed at the front end portion of the protruding portion 13. A resistor element installation part 15 is provided at the upper part of the front end of the protruding part 13 of the front plate for converting aperture information from the interchangeable lens into electrical resistance and transmitting the electrical resistance to the exposure mechanism inside the camera. 16 is a front cover, and the protrusion 13 of the front plate is
It is formed in a shape that can be fitted to the protrusion 13 and covers substantially the entire surface of the protrusion 13 except for the flange portion 13a when fitted. Here, the front cover 16 is provided with two cutting parts at the upper and lower parts, and both the cutting parts 17a, 17
b, the front cover 16 is attached to the left and right pieces 16a, 1
It is divided into 6b. The cutting portion 17 is for dividing the front cover 16 in the directions of arrows a and b so that the front cover can be fitted to the protruding portion 13 from a direction perpendicular to the photographing optical axis. . The cutting portion 17 is formed as a single cutting groove formed in the front cover 16 or as a separating portion having a predetermined interval. Reference numeral 19 denotes an aperture information transmission ring for transmitting aperture information from the interchangeable lens to the inside of the camera. Protrusion 2 that can be driven by a pin
It has 0. The aperture information transmission ring 19 is formed to be rotated by the movement of the protrusion 20, and when rotated, the amount of displacement is input to the resistor element via a transmission mechanism (not shown). is configured to do so. Reference numeral 21 denotes a bayonet seat plate for detachably holding an interchangeable lens. The bayonet seat plate 21 can be screwed directly to the front plate 11 through the aperture information transmission ring 19 and the front cover 16, and is fixed. In this state, both members 16 and 19 are sandwiched between the front plate and the front plate. The relationship between the bayonet seat plate 21, the front cover 16 and the aperture information transmission ring 19 is clearly shown in FIG. 2b. As is clear from the figure, the bayonet seat plate 21 has an opening 21a formed between the front end of the interchangeable lens attachment part and the protrusion 13 of the front plate 11, and is connected to other members (the fitting part of the front cover). 16c and the aperture information transmission ring 19 are held between them.

Since this embodiment has the above-described configuration, the front cover 16 and the aperture information transmission ring 1 can be assembled in the same manner as in the past.
9 bayonet seat plates 21 may be stacked and fixed on the protruding portion 13 of the front plate 11 in this order. Alternatively, the aperture information transmission ring 19 and bayonet seat plate 21 may be fixed first, and then the internal mechanism can be removed from the operation hole 14. The front cover 16 may be attached after the adjustment or after the adjustment of the flange back. Using the latter procedure, remove the front cover 1.
6, when installing the aperture information transmission ring 19
After fixing the bayonet seat plate 21, the front cover 16 is fitted in the direction opposite to the arrows a and b in the figure. After the above operations, when the front cover 16 is fixed to the front plate 11 with screws or the like, the assembly operation is completed as shown in FIGS. 2b and 2c.

In addition, if the front cover 16 needs to be removed after this assembly is completed, such as if the front cover 16 is damaged or if it is necessary to adjust the internal mechanism again through the operation hole 14, the above procedure should be reversed. After first removing the screws, the front cover 16 can be removed in the directions of arrows a and b.

As described above, this invention provides a plurality of cut portions in the front cover 16 to divide it, and the attachment/detachment operation is performed by moving the front cover in the plane direction relative to the front end surface of the front plate to which the front cover is attached. Since the front cover 16 can be attached and detached without removing the aperture information transmission ring 19, bayonet seat plate 21, etc. located on the front of the front cover, it is possible to attach and detach the front cover. No complicated adjustment work is required and costs can be reduced.

In addition, in the present invention, if a predetermined interval is formed in the cutting part 17 and an insertion member that can be fitted is provided in the cutting part 17, it is possible to prevent dust from entering the camera from the cutting part. In addition, it is possible to provide the insertion member with an index for positioning used when exchanging lenses, and as a result, no special index member is required, reducing the number of parts and further reducing costs. You can measure the down.

In the above description, the front cover is provided with the cutting portions 17 at two locations, but the present invention is not limited to this. For example, the cutting portions 17 are provided at three or more locations, and the front cover is It goes without saying that devices that are divided into parts or more are also based on the same technical idea of the present invention.

[Brief explanation of the drawing]

Figures 1a and 1b show conventional examples of the present invention,
Fig. 1a is an exploded perspective view, Fig. 1b is an enlarged side cross-sectional view when the assembly is completed, Fig. 2a, b, and c show an embodiment of the present invention, and Fig. 1a is an exploded perspective view. , same figure b
is an enlarged side sectional view when the assembly is completed, and Figure c is a reduced side view when the assembly is completed. 11...Front plate, 13...Fixed portion, 14...Operation hole, 16, 16a, 16b...Front cover, 16c
...Fitting part, 17a, 17b... Cutting part, 19...
...Aperture information transmission ring, 20...Engagement member, 2
1...Lens mounting member.

Claims (1)

[Scope of Claim for Utility Model Registration] Having a circular through hole through which incident light from the photographic lens can pass, and a fixed part provided on the camera body side, and a part for removably holding the photographic lens in the fixed part. A fitting part is interposed in the gap between the lens mounting member fixed to the camera body so as to overlap the fixed part and the lens mounting member in the direction of extension of the optical axis of the incident light. In the front cover formed to cover the through hole, the front cover has a plurality of cut portions at the peripheral edge of the through hole so that the front cover can be separated into a plurality of pieces in the radial direction of the through hole, and the front cover is separated by the cut portions. A front cover for a camera with an interchangeable lens, characterized in that a fitting part and a gap part are fitted together so that the front cover can be detached in a direction perpendicular to the optical axis of the incident light.