JPH0139017Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flange back adjustment mechanism for, for example, a television camera.
A yoke mount for fixing the deflection yoke, a mount having a flange fitted to the yoke mount, and a position of the yoke mount in the optical axis direction between the main chassis and the flange of the mount. two screwed adjuster strings, and one of these adjuster strings is located on the flange side of the mount, and the distance between the adjuster string and the mount in a direction parallel to the optical axis is constant; and the adjuster string and the mount. and a resilient material disposed to directly press and bias the adjusting string in a direction parallel to the optical axis direction, and the adjusting string on the side of the main shear sea is The yoke mount's position in the optical axis direction can be adjusted with extreme accuracy and smoothness by rotating the adjuster string so that it does not rotate naturally due to strong contact with the main shear seat. To provide a flange back adjustment mechanism which can be adjusted easily and which hardly causes the flange back to go out of order even if an impact force due to a drop or the like is applied after adjustment.

For example, there are two types of lenses for television cameras: fixed types and removable types such as C-mounts, and the flange back adjustment of fixed lenses is performed by moving and adjusting the master lens. The flange back adjustment of a removable lens such as a C-mount is performed by moving and adjusting the deflection yoke to which the image pickup tube is attached.

This flange back adjustment mechanism by moving the deflection yoke moves the deflection yoke engaged with the eccentric pin of the eccentric pin body in the direction of the lens optical axis by rotating the eccentric pin body disposed on the chassis of the television camera. After the flange back is adjusted, the deflection yoke is fixed to the chassis with a set screw.

In such a flange back adjustment mechanism, in order to make the television camera smaller and lighter or to make it easier to attach and detach the deflection yoke, it is necessary to support only the tip of the deflection yoke by the shear sheath instead of supporting the entire deflection yoke by the shear sheath. It needs to be supported by However, when the deflection yoke is adjusted in the longitudinal direction using an eccentric pin and only the tip of the deflection yoke is supported by the shear sheath, the length of the deflection yoke supported by the shear sheath is short. As a result, the rotational moment due to the weight of the deflection yoke itself acts heavily on the support, so it is necessary to move and adjust the deflection yoke along the optical axis direction smoothly by rotating the eccentric pin. There will be some flaws. Further, it is difficult to make fine adjustments to the flange back by rotating the eccentric pin, and it is difficult to expect accurate flange back adjustment.

In addition, if the deflection yoke is only used with a set screw to fix the deflection yoke to the chassis after adjusting the flange back, if an impact force such as a fall is applied, the parallelism of the deflection yoke to the optical axis will be distorted.
In severe cases, the deflection yoke may come off.

The present invention eliminates the above drawbacks, and examples thereof will be described below.

Fig. 1 is a side view of the main part of the flange back adjustment mechanism according to the present invention, Fig. 2 is an explanatory partial cross-sectional view thereof, and Figs. be.

In the figure, 1 is a deflection yoke, and the deflection yoke 1
An imaging tube 2 is fixed inside.

The deflection yoke 1 and a bias light 3 having an optical low-pass filter fixed therein are fitted and attached to a yoke mount 4, and by disposing a cover 5 on the yoke mount 4, the deflection yoke 1 and the bias light 3 are fitted. The bias light 3 is fixed to a yoke mount 4. A threaded groove is formed on the outer circumferential side wall of one end of the yoke mount 4, and two adjuster strings 6 and 7 having threaded grooves formed on the inner circumferential wall are disposed in this threaded groove portion and are screwed together. combined.

Further, a mount 8 having a flange is disposed in contact with the inner peripheral wall of the yoke mount 4, and this mount 8 is fixed to the main chassis 9 of the television camera with a screw or the like. Therefore,
Deflection yoke 1 includes yoke mount 4 and mount 8.
The yoke mount 4 is held in a direction parallel to the direction of the optical axis indicated by the dashed line, and can be moved by moving the yoke mount 4 in the direction of the optical axis.

Reference numeral 10 denotes a ring-shaped spring that has a wavy structure to provide an elastic force, as shown in FIGS. 3a and 3b. The elastic force of the spring 10 presses and urges the adjuster string 7 to the left in FIG.

In the above configuration, the flange back a
To adjust the rotation, apply force to the knurled portions of the outer peripheral side walls of the adjuster strings 6 and 7 exposed through the notch 11 of the mount 8, and rotate the adjuster strings 6 and 7 simultaneously in the same direction. Accordingly, the yoke mount 4 is moved forward or backward along the optical axis direction, and the flange back a is adjusted. In order to prevent the yoke mount 4 from rotating when the adjuster string rotates, the yoke mount 4 is provided with a protrusion 12, and a notch 13 that engages with the protrusion 12 is formed in the main sheath 9. has been
Although the yoke mount 4 is movable in the optical axis direction due to the engagement between the protrusion 12 and the notch 13, it cannot rotate about the optical axis.

There is a gap between the adjuster strings 6 and 7, and the repulsive force of the spring 10 is transmitted to the yoke mount 4 via the adjuster string 7, and then to the adjuster string 6 via the yoke mount 4. As a result, the yoke mount 4 is fixed in position and does not wobble. The asian string 6 is connected to the main chassis 9, and the asian string 7 is connected to the spring 1.
Since it is in strong contact with mount 8 through 0,
The adjuster strings 6 and 7 rotate naturally, and I have never had a case where the flange back was out of order.

If the flange back adjustment mechanism is configured in this way, even if the deflection yoke is held only at the tip, the parallelism of the deflection yoke to the optical axis can be maintained well, and the flange back adjustment The work for this can be done smoothly and the adjustments can be made accurately. Further, the retention of the deflection yoke is different from point retention using a set screw or the like, and is much better as it is similar to surface retention.

Furthermore, since the spring 10 is provided between the adjuster string 7 and the mount 8, if such a spring is provided between the yoke mount 4 and the mount 8, for example, the flange back adjustment will be difficult. Therefore, there is a drawback that the repulsive force of the spring 10 changes when the yoke mount 4 moves, but the repulsive force of the spring 10 is always approximately constant regardless of the flange back adjustment, and the configuration of the spring 10 You don't have to pay much attention to it, and since the spring 10 applies a strong biasing force to the asian string 7, the flange back will never go out of order even if it receives an impact force such as a fall. . That is, the force F of the spring 10 is transmitted to the adjuster string 7, to the yoke mount 4 to which this adjuster string 7 is screwed, and further to the adjuster string 6 which is screwed to the yoke mount 4. It is in strong contact with Shashi 9,
The adjuster strings 6, 7 and the yoke mount 4 are fixed.

As shown in FIG. 4, even if the adjuster string is rotated and the yoke mount 4 is moved within the adjustment range, the distance x between the adjuster string 7 and the mount 8 (the length in the crimping direction of the spring 10) will not change. First, the force relationship remains unchanged, and the spring 1
The zero force is constant. Therefore, depending on the flange back adjustment position, the fixing force of the yoke mount 4 does not become stronger or weaker, and the spring 10
When designing, it becomes possible to design without considering changes in force due to position.

In addition, if the force of the spring 10 is too strong, it will be difficult to adjust the flange back, and if it is too weak, the shock will become weak. This is extremely convenient because the fixing force of the yoke mount 4 does not become stronger or weaker.

Note that 14 is a lens.

As described above, the flange back adjustment mechanism according to the present invention includes a main chassis, a yoke mount for fixing the deflection yoke, a mount having a flange fitted to the yoke mount, and a flange of the main chassis and the mount. two adjuster strings screwed to the yoke mount to regulate the position in the optical axis direction between the adjuster and the yoke mount; A resilient member is provided between the adjuster string whose distance in the direction parallel to the optical axis is constant and the flange of the mount so as to directly press and bias the adjuster string in the direction parallel to the optical axis. The adjuster string on the main shear sea side strongly contacts the main shear sear with the elastic material so that it does not rotate naturally, and the rotation of the adjuster string adjusts the position of the yoke mount in the optical axis direction. Because the structure allows adjustment of the flange back, it is possible to adjust the flange back more smoothly than with the conventional eccentric pin mechanism.Especially when assembling, repairing, or using interchangeable lenses, it is possible to adjust the flange back after unfixing the adjuster string and adjusting the flange back. This can be done without requiring any special work such as fixing the adjuster string, and it is easy to make fine adjustments so that it can be done accurately. It does not change with flange back adjustment and is always pressed with a constant force, and there is no need to pay much attention to the composition of the elastic material, and the flange back is less likely to go out of order.Furthermore, the deflection yoke It has features such as maintaining parallelism and ensuring secure fixation.

[Brief explanation of the drawing]

Figures 1, 2, 3 a, b, and 4 are
FIG. 3 is an explanatory diagram of a flange back adjustment mechanism according to the present invention. 1...Deflection yoke, 4...Yoke mount,
6, 7...Asia string, 10...Spring (resilient material).

Claims (1)

[Scope of utility model registration request] a main shear sea, a yoke mount for fixing a deflection yoke, a mount having a flange fitted to the yoke mount, and a position of the yoke mount in the optical axis direction between the main shear sea and the flange of the mount. Two adjuster strings are screwed together for regulation, and one of these adjuster strings is located on the flange side of the mount, and the distance between the adjuster string and the mount in a direction parallel to the optical axis direction is constant. An elastic material is provided between a certain adjuster string and the flange of the mount so as to directly press and bias the adjuster string in a direction parallel to the optical axis direction, and the adjuster string on the main chassis side The flange is characterized in that the elastic material makes strong contact with the main shear sea to prevent it from rotating naturally, and the position of the yoke mount in the optical axis direction can be adjusted by rotating the adjuster string. Back adjustment mechanism.