JPH0127342Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a rotation adjustment device in an image pickup tube of a television camera.

[Technical background of the invention]

As shown in FIGS. 1 and 2, a conventional device of this type includes a sleeve 2 that is integrally provided around an image pickup tube body 1, and is provided with a long groove 3 for rotation adjustment. There is a structure in which the pin portion 4a of the eccentric pin 4 is engaged. According to this configuration, by rotating the head 4b, the pin portion 4a rotates while tracing the long groove 3, and as a result, the image pickup tube body 1 is rotated to make the desired adjustment. That's what I was doing.

[Problems with background technology]

However, while the protrusion direction of the pin portion 4a of the eccentric pin 4 is set to be the same no matter where the pin portion 4a is located, the direction of the long groove 3 provided in the image pickup tube body 1 is This image pickup tube body 3
For example, as shown in FIG. 2, the rotational position differs depending on the rotational position of the rotation position.

As a result, the size of the long groove 3 has to be considerably larger than the size of the pin portion 4a, and as a result, uniform accuracy cannot be obtained within the adjustment range during the adjustment process. At the position where the portion 4a has an α angle with respect to the long groove 3 in FIG. 2, the pin portion 4a and the engaging portion of the long groove 3 are in a point contact state, and wear may occur with long-term use, resulting in poor accuracy. The disadvantage was that it caused

[Purpose of invention]

This invention was devised in view of the above points,
The above-mentioned drawbacks of the prior art are eliminated by directing the protruding direction of the pin portion of the eccentric pin at a desired angle toward the center of rotation of the eccentric pin.

[Embodiment of the invention] An embodiment of the invention shown in FIGS. 3 to 6 will be described below. Reference numerals 11 , 11 , and 11 are image pickup tubes mounted on a three-tube television camera;
The prism section 13 is disposed opposite to the light transmitting windows 13a, 13a, 13a of the prism section 13 disposed opposite to the lens section 12. As shown in FIG. 4, the image pickup tube 11 includes a cylindrical image pickup tube body 14 around which a sleeve 14a is fixed, and a cylindrical tube that holds the image pickup tube body 14 slidably and rotatably on its inner peripheral surface. It is composed of a holder 15 having a shape. The sleeve 14
A has a long groove 14b parallel to the longitudinal direction of the image pickup tube body 14 and a long groove 14 perpendicular thereto on its outer surface.
It forms c. The holder 15 is fixed to the camera body side, and the holder 15 has an eccentric pin 16 for rotation adjustment and an eccentric pin 17 for tracking adjustment at positions corresponding to the long grooves 14b and 14c. axes A perpendicular to the longitudinal direction of the image pickup tube body 14;
The pin portions 16a and 17a of the long groove 14
b and 14c.

Reference numerals 16b and 17b are heads, and by rotating the heads 16b and 17b with a flathead screwdriver, the pin portions 16a and 17a are rotated with the eccentricity thereof as a radius. In particular, the pin portion 16a has a head portion 16b as shown in FIG.
The long groove 1 provided in the sleeve is rotated by the operation of
4b is rotated by β angle, this pin portion 16
The protruding direction of a is provided so as to match the direction of the long groove 14b, that is, toward the zero point.

Reference numeral 18 denotes a display plate, and when the camera tube main body 14 is to be slid in the direction of this central axis, the head 17b on the side indicated by arrow A is similarly rotated about the axis. indicates that the head portion 16b on the side indicated by the arrow B should be operated with a flathead screwdriver.

Numerals 19 and 19 are screws for fixing the display board 18 to the holder 15 .

When adjusting the rotation of the image pickup tube, the head 16b is rotated clockwise or counterclockwise using a flat head screwdriver or the like. Then, the image pickup tube main body 14 rotates about the 0 point in FIG. 6 within the range in which the pin portion 16a rotates using the amount of eccentricity as a radius.

At this time, the pin portion 16a slides in line contact with the groove surface of the long groove 14b, with its protruding direction constantly directed toward the rotation center 0 of the image pickup tube body 14, and rotates the image pickup tube body 14. It works in such a way that

Note that the tracking adjustment is adjusted by rotating the head 17b and sliding the image pickup tube body 14 in its longitudinal direction, similarly to the rotation adjustment.

[Effect of idea]

According to the present invention, in the image pickup tube rotation adjustment device as described above, the image pickup tube body is eccentric with respect to the long groove provided on the circumferential surface of the image pickup tube body at any position within its rotation range. Since the pin portion of the pin is configured such that its protruding direction is directed toward the center of rotation of the imaging tube main body, the short width of the long groove can be made approximately the same dimension as the diameter of the pin portion. In other words, there is no need to provide an unnecessarily large gap between the pin portion and the long groove at any position in the rotational direction of the image pickup tube body. Therefore, uniform accuracy can be obtained in the rotating direction of the imaging tube body compared to the conventional case in which the size of the long groove is considerably larger than the diameter of the pin portion. In addition, according to the present invention, the pin part engages with the groove surface of the long groove in a line contact state, so there is less wear and accuracy compared to the conventional point contact state. will not occur.

Note that the present invention is not limited to the above structure, and various modifications may be made within the scope of the invention, such as the long groove provided in the sleeve may be provided on a part of the outer peripheral surface of the image pickup tube body itself. Of course, it can be implemented.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional example, showing the engagement positional relationship between the image pickup tube body and the eccentric pin, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, and Figs. 3 to 6 are Figure 3 is a schematic diagram of the main parts showing the image pickup tube assembly of a three-tube television camera, Figure 4 is a sectional view taken along the - line in Figure 3, and Figure 5 is the image pickup tube assembly. 6 is an enlarged sectional view taken along the - line in FIG. 4. 11 ...Image tube, 14...Image tube body, 14
b, 14c...Long groove, 15 ...Holder, 16,
17... Eccentric pin, 16a, 17a... Pin part,
16b, 17b...Head.

Claims (1)

[Scope of utility model registration request] An image pickup tube body having a long groove for rotation adjustment on a part of its outer circumferential surface, a holder that rotatably holds the image pickup tube body on a cylindrical inner circumferential surface, and a position of the holder corresponding to the long groove. A provided eccentric pin and a pin portion of the eccentric pin are engaged with the long groove, and by rotating the eccentric pin, the image pickup tube main body can be rotated relative to the holder by the action of the pin portion. In this image pickup tube, the protruding direction of the pin part constantly faces the center of rotation of the image pickup tube body at any rotational position of the image pickup tube, and the groove surface of the long groove is aligned in a line. A rotation adjustment device for an image pickup tube of a television camera, characterized in that the protruding direction of the pin portion is directed at a desired angle toward the center of rotation of the eccentric pin itself so that the pin portion can slide in a state of contact.