JPH0336979Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressure plate suitable for holding a film carrier inserted into a holding cylinder.

For example, in the case of a video camera with a holding tube attached to the front of the lens barrel, the pressure plate is used to record close-up images of negative or positive film held between the film carriers. This is to hold the carrier stably. In such a video camera, developed negative or positive film is loaded into a close-up device and converted into a video image using a negative/positive reversal function.

Conventional video close-up devices are box-shaped with built-in light sources, lamps, condenser lenses, filters, film carrier holders, refracting mirrors, etc., which is not only inconvenient to handle, but also requires the film carrier to be held flat. However, there were problems with the retention stability and the inability to record clear images.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure plate that can safely hold a film carrier inserted into a holding cylinder.

In order to achieve the above object, the pressure plate of the present invention has a window hole in the center and bent stepped parts on the upper and lower edges for guiding and vertical positioning of the film carrier. A pressure plate for holding the inserted film carrier, which is provided between the window hole and the bending step and protruding in the direction of the bending step and abutting the film carrier. It is characterized by forming a plate-like spring that contacts the filter, and a claw-like spring that is bent in the opposite direction to the above-mentioned direction and comes into contact with the filter.

Next, examples of the pressure plate according to the present invention will be described in detail.

FIG. 1 shows a state in which a holding tube 3 of a film carrier 10 is attached to a lens barrel 2 of a video camera 1, and FIG. 2 shows a cross section of the holding tube 3. Holding barrel 3 is lens barrel 2
A light diffusing plate 5, an interference filter 6, and a pressure plate 7 are built into the adapter ring 4, and a film carrier 10 is mounted on the opposite side of the side wall of the holding cylinder 3. A pair of slits 8, 8 are formed into which the adapter ring 4 is inserted, and a screw 9 for tightening the adapter ring 4 is provided near the rear edge of the holding cylinder 3.

The pressure plate 7 is shown in FIGS. 3 to 5.
As shown in the figure, it is large enough to be housed in the inner wall of the holding cylinder 3, and is disk-shaped in plan, with a rectangular window hole 12 in the center that matches the film frame; Bent step portions 11, 11 (see FIG. 2) are formed on the upper and lower edges, respectively, for guiding and vertical positioning of the film carrier 10. Furthermore, this window hole 12 and a pair of bent steps 1
1 and 11, a pair of plate springs 1 for elastically holding the film carrier 10 are provided.
3 and 13, four claw-like springs 14 that come into contact with the filter 6, and small holes 15 at four corners around the window hole 12 for screwing the plate body. Then, as shown in the figure, a pair of plate springs 1
3 and 13 are elongated plates larger than the length of the longitudinal side of the window hole 12 and parallel to the same side, cut out along with the tip and connected with the other end to the plate main body.
It projects in the same direction as the bent step portions 11, 11 in an arch shape, and a small convex portion 16 for positioning the frame of the film carrier 10, which will be described later, is formed in the center thereof.

The four claw springs 14 are located around the four corners of the window hole 12 and are bent in the opposite direction to the pair of plate springs described above. And pressure plate 7
is the annular surface 2 of the holding cylinder 3 through the four small holes 15.
Insert the screw 22 into the screw hole 21 (see Figure 6) provided at
It is stopped (see FIG. 2) and set at the normal position within the holding cylinder 3. Note that FIG. 6 shows the holding tube 3 seen from the lens barrel 2 side with the pressure plate 7 removed.
This is a diagram showing the inside of the .

As shown in FIG. 2, the film carrier 10 is made up of two plates connected by a hinge 17 and in surface contact with each other, and a film (not shown) is sandwiched between the two plates. As shown in FIG. 6, along with several window holes 18 arranged at predetermined intervals in the longitudinal direction of the film carrier 10 and corresponding to each frame position of the film, a pair of plate springs 13 of the pressure plate 7, A pair of small recesses 19, 19 are also provided at positions into which the thirteen small protrusions 16, 16 are inserted.

Next, the operation and effects of the above device will be explained. To record film taken in a horizontally long composition with a video camera, the film carrier 10 is inserted into the pair of slits 8, 8 of the holding tube 3 as shown in Fig. 1, and the light source (Fig. A close-up photograph is taken while illuminating the film image through a diffuser plate 5 and an interference filter 6, and the image is recorded on a video deck or directly received on a television. The film carrier 10 is elastically pressed by a pair of plate springs 13, 13 of the pressure plate 7 set in the holding cylinder 3, and is pressed by the bent step portions 11, 11 of the pressure plate 7. Vertical positioning is performed.

Further, when the small protrusions 16, 16 are provided in the center of the pair of plate springs 13, 13, the small protrusions 1
6 and 16 are inserted into the pair of small recesses 19 and 19 of the film carrier 10, the film carrier is positioned in the lateral direction (longitudinal direction), and the film, frame, and window hole 12 are aligned during sliding operation.
matches correctly. 1 of the pressure plate 7 when the film carrier 10 is slid.
The pair of plate springs 13, 13 are bent and moved in the lateral direction (longitudinal direction) with a slight force, thereby positioning the frame again at the next frame position. Also,
During this engagement, the external force applied perpendicularly to the plane of the pressure plate 7 is exerted by the pair of plate springs 1.
3 and 13, and when the residual external force or more external force is applied, the claw-shaped spring 14 is in contact with the light diffusing plate 5 and the interference filter 6 as a contact plate. The elasticity of the claw-like spring 14 absorbs these external forces and suppresses the planar deformation of the pressure plate 7, making it possible to hold the film carrier 10 stably at all times. The contact plate can be fastened without wobbling.

The film carrier 10 is used to hold a negative film, but when a positive film is used, the film carrier 10 may have a size and shape that can detachably hold the film carrier depending on the shape of the positive film. Further, in order to record a film taken in a vertically long composition, the pair of slits 8, 8 in the holding cylinder 3 may be opened in the vertical direction, and the tightening screws 9 may be attached from the horizontal direction.

As described above, according to the pressure plate of the present invention, since it is provided with a bent plate spring and a claw spring that protrude in opposite directions to each other, the film carrier can be easily fixed not only when stationary but also during sliding operation. can be held in a stable state by pressing it flat. Further, since the pressure plate elastically holds the film carrier near the upper and lower edges of the window hole in the center thereof, the film carrier can be smoothly slid.
Furthermore, since the plate spring and the claw spring can be integrally formed together with the basic structure of the window hole and the bent step, it is easy to downsize and handle.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a video camera in which a pressure plate according to an embodiment of the present invention is built into a holding cylinder, Fig. 2 is a sectional view of the holding cylinder portion, and Figs.
5 shows a pressure plate according to this embodiment, FIG. 3 is a plan view seen from the lens barrel side, FIG. 4 is a side view, and FIG. 5 is a sectional view taken along the line - in FIG.
FIG. 6 is a plan view from the lens barrel side, showing the relationship between the film carrier and the holding barrel with the pressure plate removed. 7... Pressure plate, 10... Film carrier, 11... Bending step, 12... Window hole, 13... Plate spring, 14... Claw spring, 16
...Small convex portion, 19...Small concave portion.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Holds the film carrier inserted into the holding cylinder by having a window hole in the center and bent stepped parts on the upper and lower edges for guiding and vertical positioning of the film carrier. a pressure plate for holding the film carrier, a plate-shaped spring that protrudes in the direction of the bending step and comes into contact with the film carrier at a portion between the window hole and the bending step; A pressure plate characterized in that a claw-like spring is formed which is bent in a direction opposite to the above-mentioned direction and comes into contact with a filter. 2. Utility model registration claim 1, characterized in that a small protrusion is formed in the center of the plate spring, and the small protrusion is positioned to be inserted into a small recess provided in the film carrier. Pressure plate as described.