JPS581401B2 - television camera lens macro satsuei sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a macro photographing device for a lens for a television camera, and in particular to a television camera in which tracking can be adjusted by moving the master lens group of the photographing lens system forward and backward along the optical axis. The present invention relates to a macro photography device for a lens for a camera.

There is already a television camera (hereinafter abbreviated as TV camera).

) lenses are configured to perform so-called tracking adjustment in which the master lens group of the photographing lens system is moved forward and backward along the optical axis so that the subject image is sharply formed on the light-receiving surface of the image pickup tube. It is well known that

Furthermore, it has also been proposed to perform close-up photography, that is, macro photography, by moving the master lens group back and forth along the optical axis within the movement range of the master lens group for tracking.

However, the T
．． V. When performing macro photography, camera lenses
This has a defect that requires the tracking adjustment to be made again when performing the original zoom photographing.

In view of the above, the present invention has been devised so that, after performing macro photography, the master lens group used for macro photography can be returned to the original tracking position where tracking has been adjusted. V. The present invention provides a macro photography device for a camera lens.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a macro photography device for a television camera lens according to the present invention will be described in detail based on a specific embodiment shown in the accompanying drawings.

In FIG. 1, 1 is a fixed photographic lens barrel, 2 is a lens holding frame that fits into the lens barrel 1 so as to be movable along the optical axis and holds a master lens group Lm, and 3 is a lens holding frame for holding a master lens group Lm. a pin planted in the holding frame 2; 4, a coil spring whose one end engages with the pin 3 and urges the lens holding frame 2 to move in the direction of arrow A; 5, a shaft pin fixed to the lens holding frame 2;
and 6 indicate a roller rotatably supported on the shaft pin 6.

Further, 7 is a gear having a surface cam 7a that is in contact with the roller 6 and controls the movement of the lens holding frame 2, and 8 is a gear 10 fixed to a shaft 9 rotatably supported by a fixed frame (not shown) and the gear. 7 and an idler gear meshingly connected to each other; 11 is the shaft 9;
A fixed gear 12 is rotatably mounted on the shaft 9, and an engagement pin 13 is fixed to the side surface of the fixed gear 11.
The relay gear is shown having a notch 12a (see FIG. 2a) that engages with the gear.

Further, 14 is a shaft rotatably supported by a fixed bearing plate 15, which is not shown in the drawings, 16 is a holding nut for frictionally engaging the spring washer 17 with the fixed bearing plate 15 as shown, and 18 is a shaft rotatably supported by the shaft 14. Macro shooting operation ring that is movably attached, 1
9 is a macro gear that rotates integrally with the macro shooting operation ring 18; 20 is a click ball 20a and a click spring 20;
a click mechanism for click-locking the macro photography operation ring 18 to the fixed bearing plate 15; and 2
Reference numeral 1 denotes a holding nut that presses the spring washer 22 against the side surface of the macro gear 19 in order to frictionally engage the macro gear 19 with respect to the shaft 14.

The macro gear 19 is provided with a notch 19a in relation to the fixed gear 11 so that it cannot mesh with the macro photography operation ring 18 in a position where it is click-locked by the click mechanism 20.

(See FIG. 2b), 23 is a tracking gear fixedly attached to the shaft 14 and meshes with the relay gear 12, 24 is a tracking adjustment operation ring fixedly attached to the shaft 14, 25
is a fixed part 25a fixed to the other fixed bearing plate 15,
This tightening mechanism is composed of a movable part 25a that slides on the fixed bearing plate 15 when the operating knob 26 is operated, and is designed to lock the rotation of the shaft 14.

The T. V. A macro photographing device for a camera lens operates as follows during tracking adjustment operation and macro photographing operation.

Now, as shown in FIG. 1, the fixed gear 11 and the macro gear 19 are not engaged with each other because the macro shooting operation ring 18 is in the click position, and the shaft 14 is rotationally locked by the tightening mechanism 25. It will be explained below as follows.

When adjusting the tracking, the rotation lock of the shaft 14 is released by the tightening mechanism 25 using the operation knob 26.
The idler gear 8, the gear 10, the shaft 9, the fixed gear 11, and the fixed gear 1 are given rotational force by the surface cam 7a being pressed by the reroller 6 by the urging force of the coil spring 4.
1, rotational force is transmitted to the tracking gear 23 through the relay gear 12 connected by the engagement pin 13 as shown in FIG. .

In this state, the tracking adjustment operation ring 24
By rotating the lens holding frame 2 against the frictional engagement force of the spring washer 17 described above, the lens holding frame 2 is rotated together with the tracking adjustment operation ring 24, the tracking gear 23, the relay gear 12, and the relay gear 12. A fixed gear 11 engaged via a retaining pin 13 as shown in FIG. 2a,
The roller 6 of the lens holding frame 2 is pushed in the direction along the optical axis by the surface cam 7a rotated via the shaft 9, the gear 10, and the idler gear 8, and moves along the optical axis.

In this way, the tracking adjustment is performed by releasing the rotation lock by the tightening mechanism of the shaft 14, and rotating the tracking adjustment operation ring 24 with the rotation gear 11 and the macro gear 19 in a non-meshing state. In some cases, the master lens group L
This can be done by moving the holding frame 2 that holds the lens m back and forth along the optical axis.

After performing the tracking adjustment as described above, the master lens group Lm is maintained at the tracking position by operating the operation knob 26 to lock the shaft 14 in rotation.

Therefore, the T. V. It can be said that a camera lens can always form a sharp object image on the light-receiving surface (not shown) of an image pickup tube during a zoom operation.

Next, the T. V. When performing macro photography using a camera lens, the macro photography operation ring 18 is rotated to engage the macro gear 19 and the fixed gear 11.

At this time, although the macro photographing operation ring 18 is in a non-click locked state, frictional torque is generated by the spring washer 22, and as described above, it does not rotate due to the biasing force of the coil spring 4.

Therefore, for macro photography, the macro photography operation ring 18 is rotated to engage the macro gear 19 and the fixed gear 11, and then further rotated to move the macro gear 19, the fixed gear 11, the shaft 9, and the gear 10. This can be accomplished by rotating the idler gear 8 and surface cam 7a to push and move the lens holding frame 2 in the direction along the optical axis via the rollers 6 of the lens holding frame 2.

In this case, since the engagement pin 13 of the fixed gear 11 is within the movable range of the notch 12a of the relay gear 12, there is no influence from the relay gear 12.

When performing the original zoom photography after performing macro photography in this way, by returning the macro photography operation ring 18 to the click position, the fixed gear 11 and the macro gear 19 are connected again as shown in FIG. 2b. becomes a non-meshing state.

Therefore, the lens holding frame 2 moves along the optical axis under the biasing force of the coil spring 4, and pushes and rotates the surface cam 7a via the roller 6.

The surface cam 7a includes an idler gear 8, a gear 10, and a shaft 9.
, the fixed gear 11 is rotated until the engagement pin 13 of the fixed gear 11 is locked in the notch 12a of the relay gear 12 as shown in FIG. 2a.

Therefore, the lens holding frame 2 returns to the tracking position before macro photography.

As is clear from the detailed description above, the macro photographing device for a television camera lens according to the present invention has a tracking position that is adjusted by moving the master lens group forward and backward along the optical axis. The master lens group, which has been moved forward and backward along the optical axis during macro photography, is automatically returned to the tracking position.

Therefore, according to the macro photographing device for a television camera lens according to the present invention, after macro photographing, the macro photographing device for a television camera lens can be used automatically. It is possible to dynamically return to a state where tracking has been adjusted, and there is no need to perform tracking adjustment again after macro photography as in the prior art, which is extremely advantageous, and the effects that can be achieved are extremely large.

By the way, the macro photography device for a television camera lens according to the present invention is not limited to the above-mentioned embodiment.
For example, instead of the coil spring 4 that returns the lens holding frame from the macro photographing position to the tracking position, a biasing means may be provided on the shaft of the idler gear 8 to always bias the idler gear 8 to rotate in one direction.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing the main part of an embodiment of a macro photographing device for a television camera lens according to the present invention, and FIG. 2 is an explanatory view for explaining the same. 1... Lens barrel, 2... Lens holding frame, Lm... Master lens group, 3... Pin, 4... Coil spring,
5... Axis pin, 6... Roller, 7... Gear, 7a... Surface cam, 8... Idler gear, 9... Shaft, 10... Gear, 11... Fixed gear, 12... Relay gear, 12a...notch, 13...engaging pin, 14...shaft, 15...fixed bearing plate, 16...pressing nut, 17...spring washer,
18... Macro shooting operation ring, 19... Macro gear, 1
9a...Notch portion, 20...Click mechanism, 21...Press nut, 22...Spring washer, 23...Tracking gear, 24...Tracking adjustment operation ring, 25...
Tightening mechanism, 26...operation knob.

Claims (1)

[Scope of Claims] 1. Tracking adjustment means for moving a master lens group forward and backward to a tracking position along an optical axis, and macro photography for performing macro photography by moving the master lens group forward and backward along an optical axis. A television comprising an operating means and a return means for moving the master lens group from a macro photography position to the tracking position, and returning the master lens group to the tracking position after macro photography. Macro photography device for camera lenses. 2. A biasing means for moving and urging the master lens group in a direction along the optical axis, a tracking adjustment means for moving the master lens group forward and backward along the optical axis, and a tracking adjustment means for moving the master lens from the tracking position by the means to the macro photography position. It consists of a macro photography operation means connected to the lens group and moved forward and backward along the optical axis, and by cutting off the connection between the master lens group and the macro photography operation means after macro photography, the master lens group is moved to the tracking position by the biasing means. 2. A macro photographing device for a television camera lens according to claim 1, characterized in that the lens is configured to be able to return to its original state.