JPH028454Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an image pickup tube mounting device for fixing an image pickup tube of a video camera or the like.

[Background technology and its problems]

Usually, the image pickup tube of a video camera is attached to a lens system via a lens frame so that horizontal adjustment and the like can be performed.

Figures 1a and b are front views and side views of each frame constituting a conventional lens frame;
The figure is a side view of the frame shown in FIG. 1 attached to the lens system, FIG. 3 is a perspective view of an imaging tube having a shield cylinder adapted to the lens frame of FIG. 1, and FIG. 4 is an explanatory view.

In these figures, 1 is the lens system, 3A, 3
B is a frame in which the cylinder constituting the lens frame 2 is divided into two, with mounting flanges 4A and 4B.
holes 5 are provided in the flanges 4A and 4B.
A, 5B, screw hole 6A and hole 6B are formed,
Further, grooves 7A and 7 are formed on the inner periphery of the frames 3A and 3B.
B is formed. 8 is an image pickup tube, and a shield cylinder 9 having projections 9a that fit into grooves 7A and 7B is fixed to the outside thereof. 10A and 10B are mounting screws.

Next, attachment of the image pickup tube 8 will be explained.

The flange 4A is placed on the lens system 1 of the camera, and the screw 10A is inserted into the hole 5A and screwed onto the lens system 1 to attach the frame 3A as shown in FIG.
Then, a protrusion 9a formed on the shield cylinder 9 is fitted into the groove 7A, and the body of the imaging tube 8 is laid down on the frame 3A. Then the other frame 3B
Similarly, the protrusion 9a is fitted into the groove 7B, and the screw 10B is inserted through the hole 6B as shown in FIG.
At the same time, the screw 10A is inserted into the hole 5B and screwed onto the lens system 1 to attach the frame 3B.

As mentioned above, since the image pickup tube 8 is installed and fixed while simultaneously performing axial positioning and horizontal adjustment, the frames 3A, 3B and the shield cylinder 9
It is necessary to make grooves 7A, 7B and protrusions 9a, etc., and it is difficult to horizontally adjust the image pickup tube 8. Furthermore, if the upper and lower screws 10B are not tightened in a balanced manner when fixing the image pickup tube 8, the image pickup tube 8 will be deviated within the lens frame 2 as shown in FIG. do not. Furthermore, since the two parts of the frames 3A and 3B are manufactured by die-casting, there are problems such as high cost.

[Purpose of invention]

This invention has been made in view of the above points, and is intended to provide an imaging tube mounting device that has good workability in mounting, adjusting, etc., and can be manufactured at low cost.

[Summary of the idea]

In order to achieve the above object, this invention has a through hole for inserting a shield cylinder that shields the image pickup tube into the lens frame, a recess facing this through hole into which the image pickup tube holder is inserted, and a screw hole communicating with this recess. In addition, by forming the surface of the image pickup tube holder that comes into pressure contact with the shield cylinder into an arc shape, when the screw is screwed into the screw hole and the image pickup tube holder is pressed with its tip, the arc-shaped The shield cylinder is fixed in the lens frame by the pressing surface pressing the shield cylinder, and the shield cylinder is fixed in the lens frame.
It has good workability such as adjustment and can be manufactured at low cost.

〔Example〕

Figures 5a and 5b are a front view and a cross-sectional view taken along the - line in Figure 5a, showing an embodiment of this invention, and Figure 6 is a cross-sectional view of a lens system with a shield cylinder attached via a lens frame. , FIGS. 7a and 7b are explanatory diagrams.

In these figures, 1 is a lens system, 8 is an image pickup tube, and a shield cylinder 9A is fixed to the outside thereof. 10A and 10B are mounting screws, 11
is a lens frame, which is formed with a through hole 12 into which the shield cylinder 9A is inserted, a recess 13 facing the through hole 12, and a screw hole 14 communicating with the recess 13;
A mounting flange 15 with a hole 16 formed therein is provided. Reference numeral 17 denotes an image pickup tube holder to be inserted into the recess 13, and as shown in FIG. 7a or b, the surface in contact with the shield cylinder 9A is formed in an arc shape so as to be in close contact with the shield cylinder. Further, the surface that the tip of the screw 10B comes into contact with is a flat portion. Note that when the imaging tube holder 17 is inserted into the recess 13, a part of the imaging tube holder 17 faces the through hole 12, but is locked so that it does not fall into the through hole 12.

Next, the attachment of the image pickup tube 8 of this invention will be explained.

First, insert the camera tube holder 17 into the recess 13 of the lens frame 11, place the flange 15 against the lens system 1 of the camera, insert the screw 10A through the hole 16, screw it into the lens system 1, and attach the lens frame 11 to the lens. Attach to system 1. Then, insert the shield cylinder 9A into the through hole 12, and insert the screw 10B into the screw hole 1.
4 and press the imaging tube holder 17 against the shield cylinder 9A with its tip, and attach and fix it as shown in FIG.

Since the lens frame 11 of this invention is constructed as described above, by tightening the screw 10B, the image pickup tube holder 17 having an arcuate pressing surface comes into contact with the shield cylinder 9A as shown in FIG. 7a. Since the shield cylinder 9A is pressed, the shield cylinder 9A is positioned at the circular arc portion of the lens frame 11. Therefore, the arc portion of the lens frame 11 is the lens system 1.
If you install it so that it matches the lens system 1
and the optical axis of the image pickup tube 8 coincide with each other. At this time, even if the force when pressed by the image pickup tube holder 17 is slightly unbalanced as shown by the dotted line, it is concentrated on the arcuate portion of the lens frame 11 as shown by the arrow, so it depends on the degree of tightening of the screw 10B. The position (horizontal direction) of the image pickup tube 8 does not change. If the lens frame 11 is manufactured by die-casting, the concave portion 13 of the lens frame 11 can be molded out, eliminating the need for machining, and the image pickup tube holder 17 can be made of extruded material, making it inexpensive. It goes without saying that the image pickup tube 8 fixed in this invention may not be provided with the shield cylinder 9A.

[Effect of idea]

As explained above, the image pickup tube mounting device of this invention attaches the outer periphery of the image pickup tube inserted into the lens frame.
A small image pickup tube holder with an arc-shaped pressing surface is used to press and fix the image pickup tube by tightening screws, making it extremely easy to install the image pickup tube and providing strong fixing force. Moreover, since the proper position is determined upon installation, there is almost no need to adjust the position of the image pickup tube. Further, there are advantages such as only one part of the lens frame is manufactured by die casting, the concave portion can be formed by die cutting, and the image pickup tube holder can be manufactured at a low cost because an extruder can be used.

[Brief explanation of the drawing]

Figures 1a and b are front views and side views of each frame constituting a conventional lens frame;
The figure is a side view of the frame shown in Figure 1 attached to the lens system, Figure 3 is a perspective view of an imaging tube with a shield cylinder adapted to the lens frame of Figure 1, Figure 4 is an explanatory diagram, and Figure 5 a. , b is a front view showing an embodiment of this invention, and a sectional view taken along the line - in FIG.
FIG. 6 is a sectional view showing a shield cylinder attached to a lens system via a lens frame, and FIGS. 7a and 7b are explanatory views. In the figure, 1 is a lens system, 8 is an image pickup tube, 9A is a shield cylinder, 10A, 10B are screws, 11 is a lens frame, 12 is a through hole, 13 is a recess, 14 is a screw hole, 15 is a flange, and 16 is a hole , 17 is an image pickup tube holder.

Claims (1)

[Scope of utility model registration request] A flange coupled to the lens system, a through hole with one end open to the flange and into which the outer periphery of the imaging tube is inserted, a recess formed on the flange side of the through hole, and a screw hole communicating with the recess. a lens frame provided; an image pickup tube holder that is installed in the recess and has an arcuate pressing surface that comes into contact with the circumferentially curved surface of the image pickup tube and a flat surface that comes into contact with a screw that is screwed into the screw hole; When the screw threaded into the screw hole presses the flat surface of the image pickup tube holder with its tip, the pressing surface of the image pickup tube holder presses the outer periphery of the image pickup tube, and the inside of the lens frame is pressed. An image pickup tube mounting device characterized in that the image pickup tube is configured to be fixed to the image pickup tube.