JPS646445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a replacement member used when attaching and detaching an exchangeable focusing plate in a reflex camera.

Conventionally, two methods have been put into practical use for attaching and detaching the focus plate unit in single-lens reflex cameras with replaceable focus plates. One type is for cameras with a replaceable viewfinder pentaprism unit, in which the pentaprism unit is removed from the camera body and the reticle unit is attached or removed from the top of the camera.The other type is for cameras with a fixed viewfinder prism unit. In this device, the focus plate unit can be attached and detached from the lens exchange mount hole.

As an example of the former method is shown in FIG. This is done by dropping the focus plate unit into the plate mounting recess 1', and when removing the focus plate unit, remove the focus plate unit 2 located at the back of the recess 1'.
The method used was to remove the reticle unit with a finger or the like, or to turn the camera body upside down and drop the reticle unit. According to this conventional method, it is difficult to replace and remove the focus plate unit, and since the focus plate unit must be held by hand when replacing it, there is a risk of getting fingerprints on the Fresnel surface or the matte surface of the focus plate, and getting dirty. It was easily scratched, and this often had an adverse effect on viewfinder systems and photometry systems.

In the latter method of attaching and removing only the focus plate unit from the lens mount hole, an example of this method is shown in Fig. 2. Conventionally, only the focus plate 3 was replaced, and the focus plate 3 was attached to the camera body. A focusing plate mounting member 2' is attached to the camera body, and after rotating this member 2' and placing the focusing plate 3 on the mounting member with tweezers, the mounting member 2' is It was supposed to be fixed in place by rotating it with etc. According to this method, the focusing plate is made of a plastic plate that is easily scratched, so the focusing plate mounting member must be made of a material with sufficient strength to accurately fix it in a fixed position on the lower surface of the pentaprism inside the camera body. It was extremely difficult to configure the system as a system, and it was mechanically complex. Furthermore, when this mounting member is rotated with a finger or the like and fixed in place, fingerprints are often left on the focus plate 3 and mirror 4, causing stains or scratches. Not only does this have a negative effect on the focus plate, but it also tends to be damaged due to incorrect operation when replacing the focus plate, often resulting in poor focus plate mounting accuracy. Not only was it inconvenient in terms of repair costs, but there were also various problems with accuracy after disassembly for repair.

In order to eliminate the above-mentioned drawbacks of the conventional device, the present invention provides a replacement member for attaching and detaching the focus plate unit to the camera, which allows the focus plate unit to be attached and detached accurately without touching the focus plate unit directly. By using this, it is possible to prevent fingerprints or scratches on the focus plate or mirror, which are likely to occur when replacing the focus plate, and to simplify the replacement operation.

The present invention will be explained in detail below with reference to the drawings.

FIG. 3 shows an example based on the method of the present invention in which the pentaunit is removed and the focus plate is replaced. FIG. 3a is a perspective view and FIG. 3b is a side view. In the figure, 11 is the camera body, 12 is the focus plate unit, 1
Reference numeral 3 designates a replacement member coupling and holding member, 14 a coupling and holding portion for the focusing plate unit replacement member, and 15 a stable holding portion, which in this case also serves as the coupling and holding portion in terms of shape. 16 is a handle, and 7 is a reticle protection stopper.

The focus plate unit 12 is attached to and removed from a recess 11' in the lower part of the pentaunit of the camera body 11. At that time,
A member coupling and holding part 14 is coupled and held by the replacement member coupling and holding part 13 of the reticle unit by the spring properties of the handle part 16, and can be attached and detached.
Therefore, even if the focus plate unit 12 is located deep inside the recess 11' of the camera body 11 and it is difficult to remove it with your fingers, you can use the replacement lens according to the present invention without turning the camera body 11 upside down. The parts can be easily removed. Moreover, the replacement member is provided with a stopper 15 for protecting the reticle, and the upper part 12' of the reticle mounting member 12 is raised higher than the reticle, so that the member does not touch the reticle, thereby preventing scratches. There isn't. Therefore, the effect is that the camera body can be easily attached and detached without having to hold it upside down, and because it does not have to be held with fingers, it can be quickly attached and detached without leaving fingerprints or dirt on the focusing plate.

Next, FIGS. 4 and 5 show an embodiment of a system in which a focus plate unit can be attached and detached from a lens mounting hole, and a replacement member having a joint release member is used.

4 is a front view and a side view of the replacement member, and FIG. 5 is a rear view and a side view showing the member shown in FIG. 4 with a focus plate unit attached thereto.

In the figure, 28 is a joint release lever, and 29 is a spring that returns the joint release lever to its original position. The coupling and holding part 24 is engaged with the replacement member coupling and holding part 23 on the focusing plate mounting member side of the focusing plate unit 22 by utilizing its spring property, and together with the coupling and holding part 24' on the side thereof, the focusing plate unit Holds 22. The stability holding section 25 is the focus plate unit 22.
By receiving the bottom surface of the reticle, the reticle unit is held in a stable position to prevent it from becoming bent and attached to the reticle, and is also held by supporting the direction of the bottom surface. In addition, by adjusting the thickness A of the coupling and holding portion 24, the height direction is regulated during installation, and the focusing plate 2
It also plays the role of a protective stopper to prevent 2 from being damaged by replacement parts.

FIG. 6 is a diagram showing a state in which the focus plate unit is removed from the camera body using the focus plate unit replacement member according to the present invention shown in FIGS. 4 and 5. FIG.

In the figure, 30 is a lens mounting mount, 31
32 is a die-cast front plate, 32 is a joint member, 33 is a fixed receiving plate, and 34 is a mirror.

As shown in the figure, the connecting and holding part 2 at the tip of the replacement member
4 is the replacement member coupling and holding part 23 of the focusing plate unit.
Then, while pushing in the direction of the arrow, rotate the handle 26 in the direction of pentagrams (arrow) about the part, and stop pushing the replacement member until it comes in contact with the reticle unit. As a result, due to the spring properties of the coupling and holding part 24, the replacement member coupling and holding part 24' on the opposing side of the holding part 24 is coupled to the replacement member. Next, when the replacement coupling release lever 28 is pushed, the coupling member 32 on the camera body side is detached from the coupling and fixing portion of the reticle unit. At this time, the focusing plate unit is removed from the camera body, but the replacement parts are the connecting and holding part 24,
It remains attached by 24'. Therefore, the replacement member holding the focus plate unit can be taken out from the mount hole without directly holding the focus plate unit and without soiling or scratching it.

FIG. 7 is a diagram showing a state in which a reticle unit is attached to a camera body using the reticle replacement member of the present invention shown in FIGS. 4 and 5. FIG.

Insert the replacement member holding the focus plate unit into the mount hole and insert the joint holding part 24 of the focus plate unit into the fixed receiving plate 33 on the camera body side. When rotated in the pentagonal direction (arrow), the connecting and holding parts 24, 24' of the focus plate unit are connected to the camera-side joint member 33,
32 and attach it together with the replacement member.Next, while pushing the handle 26 in the direction of the arrow, rotate the handle 26 in the opposite direction (arrow) around the joint holding part 24 of the replacement member. Then, only the replacement part will be removed from the camera body. The replacement reticle unit case is the same as the camera body, and if the mechanism is attached, the reticle unit can be replaced.

FIG. 8 is a front view, a side view, and an enlarged view of essential parts showing another embodiment of the focusing plate replacement member according to the present invention. In the embodiment shown in FIG. 8, the handle portion 26 and the receiving portion are molded into one body. By integrally molding as shown in the figure, assembly and component costs are greatly improved. In addition, if the hook part 34 on the hook side is tapered as shown in the enlarged view of the main part in Figure 8, you can forcefully lower it without pressing it by mistake when removing only the replacement part. The reticle unit is designed so that it will not be damaged even when it is damaged.

FIG. 8c is an enlarged view showing the reticle unit 22 attached to the tapered portion 34.

It goes without saying that a replacement member for laterally connecting and holding the reticle unit can also be easily constructed.

As described above, by using the focusing plate replacement member according to the present invention, the drawbacks of the conventional focusing plate replacement method are eliminated, and the focusing plate of a reflex camera can be easily replaced. There are great things like.

(1) No more fingerprints or scratches on the reticle.

(2) No fingerprints or scratches on the movable mirror surface of the camera body.

(3) Since the replacement member receives at least two sides of the lower surface of the focusing plate mounting member, the focusing plate mounting member can be prevented from being bent and attached.

(4) Since the replacement part is equipped with a holding release member that pushes the holding member of the camera body in the non-holding direction,
The focusing plate mounting member can be easily removed from the camera body.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of conventional focusing plate replacement in a viewfinder interchangeable camera; Fig. 2 is a sectional view showing an example of conventional focusing plate replacement in a camera in which focusing plate is replaced from the lens mount hole;
The figures are a perspective view and a side view showing an example of the premise of the focusing plate replacement member of the present invention in a viewfinder interchangeable camera, and FIG. FIG. 5 is a front view and side view showing one embodiment of the member; FIG.
The figure is a side view showing the state when the focus plate is removed from the camera body using the focus plate replacement member according to the present invention;
FIG. 7 is a side view showing how the focusing plate is attached to the camera body using the focusing plate replacement member according to the present invention, and FIG. 8 is a front view showing another embodiment of the present invention.
They are a side view and an enlarged view of important parts. DESCRIPTION OF SYMBOLS 1... Camera body, 2, 22... Focus plate unit, 3... Focus plate, 13, 23... Replacement member coupling and holding member on unit side, 14, 24... Replacement member coupling and holding part, 5 ...Stability holding part, 6,26
...Handle, 7...Focus plate protection stopper, 28
...Join release lever, 29...Join release lever return spring, 30...Camera body mount section, 31
... Front plate die-casting part, 32 ... Joint member, 3
3...Fixed receiving plate, 34...Mirror.

Claims (1)

[Scope of Claims] 1. A plurality of lenses that support the focus plate, are removable from the camera body, are offset from the focus plate in the downward direction of the optical axis, and are spaced apart in a direction substantially perpendicular to the optical axis. In the replacement member, the replacement member is coupled to a focusing plate mounting member formed with a coupling portion, and is attached to and detached from the camera body through a lens attachment mount hole, the replacement member having a plurality of coupling portions of the focusing plate mounting member formed thereon. forming a plurality of abutting portions at positions corresponding to the portions, and forming a holding portion for receiving at least two sides of the focusing plate mounting member on a lower optical axis surface;
The replacement member is characterized in that the corresponding contact portion is formed to be elastically deformable, and the holding portion is set at a position to receive the optical axis downward direction while the corresponding contact portion is in contact with the coupling portion. 2. Supports the focusing plate and is made removable from the camera body, and is coupled to a focusing plate mounting member formed with a plurality of joints spaced apart from the focusing plate in the optical axis direction, so that it can be attached to and removed from the camera body. In the replacement member, the replacement member is formed with a plurality of elastically deformable abutting portions that correspond to the plurality of joint portions of the focusing plate mounting member, and is further movably supported. By disposing a holding release member that pushes the holding member of the camera body that elastically holds the focus plate mounting member in the non-holding direction during movement, the plurality of connections can be prevented. When the replacement member comes into contact with the part, the corresponding contact part of the replacement member is elastically coupled, and by moving the holding release member,
A replacement member characterized in that the focusing plate mounting member can be removed from the camera body.