JP2000356732A - Television lens device and cover fixing mechanism therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a projecting part and to enable a cover to be quickly attached and detached. SOLUTION: This television lens device is provided with a fixing mechanism 13 for fixing a lens main body 11 and the cover 12 in the inside of the handle groove 14 of the cover 12 so that the fixing mechanism 13 does not project from the side surface 12a of the cover 12. The main body 11 is provided with a fixed hook 20 having a small diameter part 20a and a locking part 26b. A lever 23 is supported at a base 21 fixed to the cover 12 through supporting shafts 24a and 24b and pressed in a direction shown by an arrow C by a torsion coil spring 25. The engagement part 26c of a movable hook 26 is supported at the lever 23 and the parallel part 26a of the hook 26 and the lever 23 are coupled by a tension coil spring 27. Then, the locking part 26b of the hook 26 is pressed to the hook 20 side. By the pressing force of the spring 25, that of the spring 27 and the distortion tensile force of the hook 26, the lever 23 is held at a close position or an open position with the dead point thereof as a boundary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a television lens device provided with a cover for protecting a lens barrel portion, an operation portion and the like of a lens body, and a cover fixing mechanism of the device.

[0002]

2. Description of the Related Art In a conventional television lens apparatus, as shown in FIG. 12, a rectangular tubular cover 2 is fixed to the front of a lens body 1 by screws 3 with left and right knobs. As shown in FIG. 13, the lens body 1 has support portions 1 a to 1 c for supporting the cover 2, a lens barrel portion 1 d having a lens group movably incorporated therein, and an operation panel 1 e for adjusting the lens group. The cover 2 has an insertion hole 2a through which the screw portion 3a of the thumb screw 3 is inserted. The cover 2 has an insertion hole 2a through which the screw portion 3a of the thumb screw 3 is screwed. It is inserted and removed from the lens body 1.

An operator of this type of television lens device needs to remove the cover 2 from the lens body 1 when operating the operation panel 1e or repairing a lens group. In particular,
In recent years, with the advancement of television lens devices, there are many opportunities to set the characteristics of the zoom speed, the sensitivity of focus, and the like.

[0004]

However, in the above-mentioned conventional example, since the knob screw 3 protrudes from the surface of the cover 2, clothes of an operator or a passerby are caught on the knob portion 2b of the knob screw 3. Sometimes. For this reason, there is a problem that the set angle is disturbed, the image is disturbed, or the device is damaged due to the TV lens device moving or falling.

Further, since the cover 2 is fixed by the screw 3 with the knob, it is necessary to rotate the screw 3 with the knob several times when attaching and detaching the cover 2. Accordingly, there is a problem that the operation for attaching and detaching the cover 2 is troublesome, and that much time is required, and that the screw 3 with the knob is forcibly forgotten or insufficiently tightened.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a television lens device having no projection.

It is another object of the present invention to provide a cover fixing mechanism for a television lens device which allows the cover to be quickly attached and detached.

[0008]

According to the present invention, there is provided a television lens apparatus according to the present invention, wherein a cover is fixed to a lens body by a fixing mechanism, wherein the fixing mechanism is connected to the lens body or the cover. It is characterized in that it is provided so as to be embedded in.

A cover fixing mechanism for a television lens device according to the present invention is a cover fixing mechanism for a television lens device for fixing a cover to a lens body, wherein the first hook provided on the lens body and the cover are provided on the cover. A second hook, and a lever that engages or disengages the first hook and the second hook in one operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is an external perspective view of the television lens device. Since the outer surface of the television lens device is bilaterally symmetrical with respect to the axis, reference numerals are given only to one side. A cover 12 is fixed to the lens body 11 via a fixing mechanism 13. Side 12 of cover 12
A is provided with a handle groove 14 for forming a handle 12b, and the fixing mechanism 13 is provided inside the handle groove 14 so as not to protrude from the side surface 12a of the cover 12.

FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. 2. The lens body 11 has a small diameter portion 20a and a locking portion 20b. Is fixedly protruded forward. A base 21 having a guide surface 21 a is provided with, for example, two fixing screws 22 on a back wall 12 c of the cover 12 located behind the handle groove 14.
It is fixed by. A lever 23 is supported on the base 21 via upper and lower support shafts 24a and 24b so as to be openable and closable within a range of, for example, 90 degrees.
It is urged in the C direction by a torsion coil spring 25 disposed between the coils 24b.

A movable hook 26 is rotatably supported by the lever 23. The movable hook 26 is used to move a rod into a flat plane.
It is formed by curving in a U-shape and a U-shape on the side. The movable hook 26 includes two parallel portions 26a positioned in parallel at an interval, a locking portion 26b that connects these parallel portions 26a and locks the locking portion 20b of the fixed hook 20. The parallel portion 26a on the opposite side of the stop portion 26b
And fitting portions 26c which are bent upward and downward, respectively. The fitting portion 26c of the movable hook 26 includes a support shaft 24a,
Hole 23c formed in lever 23 near 24b
The parallel portion 26a and the lever 23 are connected by a tension coil spring 27, and the locking portion 26b is
Is biased to the side.

The shapes, dimensions and strengths of the fixed hook 20, the lever 23 and the movable hook 26, the positions of the torsion coil spring 25 and the tension coil spring 27, the urging force, and the like have the following effects. Has been determined. That is, when the lever 23 is in the closed position as shown in FIG. 2, the outer surface 23a of the lever 23 substantially coincides with the side surface 12a of the cover 12, and the engaging portion 26b of the movable hook 26 is engaged with the engaging portion 20b of the fixed hook 20. To lock. At this time, the strain tension of the movable hook 26 sufficiently pulls the fixed hook 20 and holds the lever 23 in the closed position.

As shown in FIG. 4, when the lever 23 is opened in the direction C against the urging force of the extension coil spring 27, the lever 23 initially attaches the locking portion 26b of the movable hook 26 to the fixed hook 20 side. Keep on going. However, when the lever 23 passes through the dead point where its rotational force becomes zero, the strain tension of the movable hook 26 rotates the lever 23 to the open position as shown in FIG. At this time, the front edge 23a of the lever 23 is
Adjacent to the back wall 12c, the lever 23 does not rotate any further. Further, the locking portion 26b of the movable hook 26 moves upward along the guide surface 21a of the base 21, separates from the small diameter portion 20 of the fixed hook 20, and holds this state.
In this state, if the cover 12 is pulled forward, the movable hook 2
The sixth locking portion 26b moves forward without being caught.

On the other hand, when the cover 12 is attached, the above procedure may be reversed. That is, the lever 23 is closed after the cover 23 is sufficiently inserted into the lens body 12. Thereby, when the lever 23 passes the dead center, the strain tension of the movable hook 26 rotates the lever 23 to the closed position. At this time, the locking portion 26b of the movable hook 26
Moves along the guide surface 21a into the groove 20a of the fixed hook 20, and is locked by the locking portion 26b to attract the fixed hook 20.

When the lever 23 is closed as shown in FIG. 7 with the cover 12 not sufficiently pushed into the lens body 11 as shown in FIG. And the lever 23 returns to the open position.

As described above, in the embodiment, when the lever 23 is in the closed position, the outer surface 23a is connected to the outer surface 1 of the cover 12.
2a, there is no protrusion on the cover 12 and the clothes of the operator and passers-by are not hooked. Further, since the fixed hook 20 and the movable hook 26 can be engaged or disengaged with only one operation of the lever 23, the cover 23 can be quickly attached and detached. Accordingly, the time required for attaching and detaching the cover 12 is reduced, and the troublesome operation of turning the conventional fixing screw, forgetting to close the fixing screw, insufficient tightening, and the like are eliminated. Then, since the lever 23 returns to the open position when the cover 12 is not at the predetermined position, the attached state of the cover 12 can be visually confirmed, the cover 12 can be securely fixed, and forgetting to fix the cover 12 or damage to fixing is eliminated.

In the embodiment, the torsion coil spring 25 and the extension coil spring 27 are used to bias the lever 23 and the movable hook 26. However, as long as they have the corresponding torsion and tension, It can be replaced by an elastic member such as a leaf spring. Further, the fixing mechanism 13 is connected to the handle groove 14 of the cover 12.
However, as shown in FIG. 8, it may be arranged in the concave portion 15 formed in the cover 12 ′, or as shown in FIG. 9, in the concave portion 16 formed in the lens body 11 ′. Furthermore, if the simplicity is ignored and only the protrusion is eliminated, the thumb screw 17 is provided in the rear wall 12c of the handle groove 14 of the cover 12 as shown in FIG. 10, or as shown in FIG. Recessed part 1 having a screw 18 with a knob formed on cover 12 '
9 can be provided.

[0019]

As described above, in the television lens device according to the present invention, the fixing mechanism is provided so as not to protrude from the surfaces of the lens body and the cover. Nothing. Therefore, it does not move during use and does not disturb the image or change the set angle.

Also, the cover fixing mechanism of the television lens device according to the present invention includes a lever for engaging or disengaging the first hook and the second hook by one operation, so that the cover can be quickly attached and detached. it can. In addition, if the lever is returned to the open position when the cover is not at the predetermined position, the fixed state of the cover can be visually recognized, so that the cover can be securely fixed, and forgetting to fix or damage to fixing can be prevented.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is an operation explanatory view of a fixing mechanism.

FIG. 5 is an explanatory diagram of an operation of a fixing mechanism.

FIG. 6 is a sectional view showing a state where a cover is not at a predetermined position.

FIG. 7 is an explanatory diagram of an operation when the cover is not at a predetermined position.

FIG. 8 is a perspective view of a modification.

FIG. 9 is a perspective view of a modification.

FIG. 10 is a perspective view of a modification.

FIG. 11 is a perspective view of a modification.

FIG. 12 is a perspective view of a conventional example.

FIG. 13 is a perspective view of a conventional example with a cover removed.

[Explanation of symbols]

 11, 11 'Lens body 12, 12' Cover 13 Fixing mechanism 14 Handle groove 15, 16, 19 Depression 20 Fixing hook 21 Base 21a Guide surface 23 Lever 24a, 24b Support shaft 25 Torsion coil spring 26 Movable hook 26a Parallel portion 26b Locking part 26c Fitting part 27 Extension coil spring

Claims (10)

[Claims] 1. A television lens device having a cover fixed to a lens body by a fixing mechanism, wherein the fixing mechanism is provided so as to be embedded in the lens body or the cover. 2. The television lens device according to claim 1, wherein the fixing mechanism is provided in a concave portion of the lens body. 3. The television lens device according to claim 1, wherein the fixing mechanism is provided in a concave portion of the cover. 4. The television lens device according to claim 3, wherein the recess is a handle of the cover. 5. A cover fixing mechanism of a television lens device for fixing a cover to a lens body, wherein a first hook provided on the lens body and a second hook provided on the cover.
And the first hook and the second hook
And a lever which engages or disengages in one operation. 6. The cover fixing mechanism for a television lens device according to claim 5, further comprising means for holding said lever in a closed position when said first hook and said second hook are engaged. 7. The cover fixing mechanism for a television lens device according to claim 5, further comprising means for holding the lever in an open position when the first hook and the second hook are not engaged. 8. The first hook is fixed, and the second hook is fixed.
6. The cover fixing mechanism for a television lens device according to claim 5, wherein the hook is movable. 9. One end of the second hook is engaged with the lever so as to rotate around the center of rotation, and the other end of the second hook is engaged with the first hook. 9. The cover fixing mechanism for a television lens device according to claim 8, further comprising a guide portion that is capable of disengaging and guides the other end of the second hook away from the first hook. 10. A first urging means for urging the second hook toward the first hook, a second urging means for urging the lever in an opening direction, and the lever is dead. 10. The television lens device according to claim 9, wherein the first hook and the second hook are engaged with each other using a strain tension of the second hook generated when passing through a point. Cover fixing mechanism.