JPS6124975Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a focus plate attaching/detaching device for a single-lens reflex camera with a detachable focus plate.

Prior Art This attachment/detachment device attaches the focus plate to the focus plate holder in order to replace the focus plate with a different type or to clean dust etc. that has adhered to the focus plate after the assembly of the camera is completed. The applicant has already proposed this type of device (Utility Model Application No. 1989-1999).
(See Publication No. 79033). However, the above device
Since the focusing plate is held by returning the holding member that has been evacuated from the clamping position to the clamping position and fixing it, the operation of attaching and detaching the focusing plate is troublesome, and there is a drawback that this cannot be done with a single touch. .

Purpose The purpose of the present invention is to provide an attachment/detachment device that allows a reticle attached to a reticle holder to be attached or detached by approximately one-touch operation.

Summary The focus plate attachment/detachment device of the present invention has a clamping means for pinching the front end of the focus plate from above and below, an upper support member made of an elastic member for pressing the front end of the focus plate from above, and a front end of the focus plate. and a lower support member made of an elastic member that elastically deforms from a clamping position where the lens is supported from below to a retracted position where the clamping is released. After being retracted to the retracted position, it is characterized in that it automatically returns to the clamping position.

Embodiment An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. A lens mount seat plate 2 is fixed to the front plate 1 of the camera body, and a frame having a receiving part 6 for the pentaprism 4 is attached. A body 3 is fixedly installed.
A mounting portion 3b having a screw hole (not shown) is formed at the bottom of the frame 3, and a compression spring 10 is fitted into the mounting portion 3b. On the other hand, a plurality of bent pieces 9 are formed on the side frame of the focus plate holder 5, corresponding to the mounting portions 3b. This bent piece 9 is
The bending piece 9 is installed on the compression spring 10 and
A screw 8 inserted into the screw hole 9a passes through the compression spring 10 and is screwed into a screw hole (not shown) at the bottom of the mounting portion 3b. Therefore, this screw 8
By adjusting the screw-in of the focus plate holder 5,
is placed on the frame 3 with its position and inclination adjusted.

A leaf spring 23 constituting the first clamping means is attached to the inner surface of the rear frame of the focusing plate holder 5 by crimping 21.
is fixed. The left and right ends of this leaf spring 23 are
It is formed so as to curve forward away from the rear frame, and bent pieces 12a and 12b are formed at both ends thereof with an interval slightly narrower than the thickness of the focus plate 7 above and below.

The lower support member and the upper support member of the second clamping means are constituted by a leaf spring 25 and an elastic wire 11, respectively. The front frame of the focus plate holder 5 is formed with a position regulating hole 13 into which the protrusion 7a of the focus plate 7 to be mounted is inserted, and a plate spring 25 having a bent tongue piece 25a. An opening 14 into which the knob 7b of the focus plate 7 fits is formed on the side of the lens. The bullet rays 11 are passed through small holes 16, 17, and 18 formed in the focus plate holder 5, and press downward from above the focus plate 7 mounted along the inner surface of the front frame. Note that 15 indicates a movable mirror, 22 shown in FIG. 2 is a flare prevention plate, and 26 is a buffer member for the pentaprism 4.

This focusing plate mounting device is constructed as described above, so grip the focusing plate 7 with the knob 7b, insert it through the front opening of the lens mount seat plate 2, and attach the rear edge of the focusing plate 7 to the focusing plate holder 5. Insert between the upper and lower bent pieces 12a and 12b of the leaf spring 23,
Push it backwards against the leaf spring 23, push up the focus plate 7 upward against the bullet 11 using it as a fulcrum, and push the protrusion 7a into the bent tongue piece 25a of the leaf spring 25.
to deflect the leaf spring 25 forward. Then, the protrusion 7a fits into the position regulating hole 13, and the focus plate 7 is attached to the focus plate holder 5. At this time, the leaf spring 23 presses the focus plate 7 forward from the upper focus plate holder 5 that holds the focus plate 7 from above and below, and while the bullet 11 presses the focus plate 7 downward, the position regulating hole of the plate spring 25 Since the reticle 13 is supported from below by the lower side of the reticle 13, the reticle 7 is held in a regulated position and prevented from falling off.

Next, in order to remove the focus plate 7 from its holder 5, insert your finger into the front opening of the lens mount seat plate 2, pinch the bent tongue piece 25a of the leaf spring 25, and pull it forward. , protrusion 7a
By pulling out the focus plate 7 from the position regulating hole 13, pinching the knob 7b, and pulling out the focus plate 7 forward, the focus plate 7 can be pulled out of the camera body through the opening.

Effects In the focus plate attaching/detaching device of the present invention, when the focus plate is attached, the lower support member that supports the front end of the focus plate from below is elastically deformed by contact with the focus plate and is retracted from the clamping position. Since it automatically returns to the clamping position, it is possible to attach the focus plate to the camera body almost in a one-touch manner. Furthermore, according to the present invention, there is no need to provide a separate hinge for the focus plate mounting device, and no special space is required for the hinge, so it can be made smaller. left and right,
The finder light beam is also convenient for displaying detected values such as shutter speed and aperture value.

In addition, if the clamping means for clamping the rear end of the reticle are both part of a leaf spring attached to the rear frame of the reticle holder, the distance between the two shall be adjusted regardless of the mounting position of the leaf spring. It can be kept constant and the holding of the focusing plate is extremely stable.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main parts of an embodiment of the present invention, Fig. 2 is a vertical cross-sectional side view of the main parts of the same embodiment, and Fig. 3 is an enlarged view of the focusing plate and focusing plate holder. FIG. 5... Focus plate holder, 7... Focus plate, 23...
...first clamping means, 11,25...second clamping means,
11... Upper support member, 25... Lower support member,
7a...Protrusion, 13...Position regulation hole.

Claims (1)

[Claims for Utility Model Registration] 1. A first clamping means provided on the rear frame of the focus plate holder so as to sandwich the rear end of the focus plate from above and below, and a focus plate holder so as to sandwich the front end of the focus plate from above and below. In the focus plate attachment/detachment device, the focus plate attachment/detachment device has a second holding means provided on the front frame of the single-lens reflex camera body, and is configured such that the focus plate can be replaced from the front opening of the single-lens reflex camera body. an upper support member made of an elastic member for pressing the front end of the reticle from above; and an elastic member that elastically deforms from a clamping position supporting the front end of the reticle from below to a retracted position releasing the grip; a lower support member configured to be elastically deformed to the retracted position by contact with the front end of the reticle and return to the clamping position when the front end moves to a predetermined position. Board attachment/detachment device. 2. The focus plate attaching/detaching device according to claim 1, wherein the lower support member is constituted by a leaf spring integrally formed with the front frame of the focus plate holder. 3. A protrusion is formed on the front end of the focus plate, and a position regulation hole into which the protrusion engages is formed in a leaf spring formed on the front frame of the focus plate holder, and the protrusion and position regulation hole are arranged in the same manner as described above. A utility model characterized in that when the front end of the reticle is moved to a predetermined position, the protrusion is arranged to engage with the position regulating hole, and the leaf spring returns to the clamping position due to the engagement. Scope of registration claims 2nd
Focus plate attachment/detachment device as described in Section 1.