JP3271417B2 - Camera back focus adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back focus adjustment mechanism for a camera, and more particularly, to an adjustment mechanism having a lock member for locking an adjustment operation member, which prevents damage caused by an excessive operation in a locked state of the adjustment operation member. Pertaining to the structure.

[0002]

2. Description of the Related Art First, a background art of the present invention will be described with reference to FIGS.

In FIGS. 1 and 2, reference numeral 1 denotes a monitoring camera main body, 2 denotes a lens thereof, and an adjusting mechanism for finely adjusting a back focus corresponding to the lens 2 is provided inside the camera main body 1. I have. That is, the lens 2 attached to the camera body 1 has a different focal length depending on the type, and even if the lens is of the same type, there is a slight deviation in the focal length. Therefore, the back focus adjustment mechanism in the camera body is adjusted accordingly. It is to adjust.

The mechanism for adjusting the back focus is shown in FIGS.
This will be specifically described with reference to FIG. In the figure, reference numeral 3 denotes an image pickup device (CCD) provided corresponding to the lens 2 and 4 denotes a flange back on which the image pickup device 3 is mounted. / Separated direction).

Reference numeral 6 denotes an adjusting operation member for moving the flange back 4. The adjusting operation member 6 has a disk shape as is apparent from the drawing, and an operation portion 6a is provided at the center of rotation. . A groove is formed in the operation unit 6a, and an operation tool (a so-called minus driver) is inserted into the groove of the operation unit 6a from a first hole 7 formed in the outer casing 1a of the camera body 1 to perform a rotation operation. Is what you do.

An engaging pin 8 projects from an eccentric portion on the lower surface side of the adjusting operation member 6, and the engaging pin 8 engages with an engaging long hole 9 formed on the upper edge surface of the flange back 4. Thus, the flange back 4 is configured to move in the front-rear direction in conjunction with the rotation operation of the adjustment operation member 6.

As described above, by rotating the adjustment operation member 6 to move the flange back 4 in the front-rear direction,
The back focus can be adjusted according to the focal length of the lens 2 as shown in FIGS. 3A and 3B.

In this back focus adjusting mechanism, after the back focus is adjusted, the adjusting operation member 6 is set in a non-rotatable state so that the flange back 4 does not unexpectedly move due to vibration or the like and the back focus shifts. Is provided with a lock mechanism.

That is, the lock mechanism comprises a lock screw 11 which is screwed into a screw hole 10 which is a second hole formed in the outer casing 1a of the camera body 1, and an inner end of the lock screw 11 is adjusted. It corresponds to the upper plane portion of the operation member 6.
A groove is formed at the outer end of the lock screw 11 as an operation part. Like the adjustment operation member 6, an operation tool (a flathead screwdriver) is inserted into the groove to perform a rotation operation.

By rotating the lock screw 11 and mechanically pressing the inner end of the lock screw 11 against the adjustment operation member 6, the adjustment operation member 6 is locked in a non-rotatable state. It is not moved, that is, the back focus is not out of order.

[0011]

As described above, in the adjusting mechanism having the lock mechanism for locking the adjusting operation member 6 so that the adjusting operation member 6 cannot be rotated, the back focus must be released unless the user releases the lock of the adjusting operation member 6 by the lock screw 11. Can not be adjusted, but when operated by an inexperienced user who does not understand the meaning of "lock", or the lock screw 11 for performing "lock" is inconspicuous or there is no display of "lock" In some cases, for example, the user may forcibly rotate the adjusting operation member 6 while keeping the locked state.

In this case, the adjusting operation member 6 is damaged,
Alternatively, there was a high risk that the operating tool would be damaged and a complaint would be made. The present invention has been made to solve this problem.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention adjusts the back focus in accordance with the focal length of a lens by rotating an adjusting operation member, and after this adjustment, uses a lock screw. In a back focus adjustment mechanism for a camera in which an adjustment operation member is locked in a non-rotatable state, a first hole and a second hole are formed in an outer housing of a camera body, and the adjustment operation member has a disk shape. An operation unit is provided at the rotation center, and the operation tool is inserted through the first hole to rotate the adjustment operation member. By mechanically pressing the adjusting operation member, the rotation operation member is locked in a non-rotatable state, and the operation tool is inserted from the second hole to rotate the lock screw. Further, a closing plate is directly fixed to the lock screw, the lock screw and the closing plate are configured to be integrally rotated, and the adjusting operation member is locked by rotating the lock screw. In this configuration, the first hole is closed by the closing plate, and when operating the adjustment operation member, the lock is first released to open the first hole, and then the rotation operation of the adjustment operation member is performed. is there.

[0014]

The adjusting mechanism of the present invention configured as described above is used by closing the first operation hole of the adjusting operation member by the closing plate when the adjusting operation member is locked by the lock screw. Since the user cannot forcibly operate the adjustment operation member, there is no possibility that the adjustment operation member or the operation tool is damaged.

[0015]

Embodiments of the present invention will be described below with reference to FIGS. This embodiment shows a case in which the present invention is applied to the back focus adjusting mechanism of the monitoring camera shown in the conventional example of FIGS. 1 to 5 described above. In this embodiment, parts corresponding to those of the conventional example are denoted by the same reference numerals. It is attached.

That is, by rotating the adjusting operation member 6, the flange back 4 is moved in the front-rear direction to adjust the back focus, and after this adjustment, the locking screw 1 is adjusted.
The structure in which the adjustment operation member 6 is locked in a non-rotatable state by 1 is the same as the conventional example.

In the adjusting mechanism according to the present invention,
A first hole for operation of the adjustment operation member 6 (hereinafter referred to as an operation hole) in order to prevent an excessive operation of the adjustment operation member 6.
A closing plate 12 that closes 7 is provided.

In the present embodiment, the closing plate 12 is directly fixed to the lock screw 11, that is, is turned integrally with the lock screw 11. When the adjustment operation member 6 is not locked, the closing plate 12 is at a position corresponding to the operation portion 6a of the adjustment operation member 6 as shown in FIG. 6A. In the locked state, as shown in FIGS. 6B and 8, the closing plate 12 comes to a position covering the operation portion 6a of the adjusting operation member 6, and closes the operation hole 7.

As described above, in the adjusting mechanism of the present embodiment, when the adjusting operation member 6 is locked by the lock screw 11, the operating hole 7 is closed by the closing plate 12, so that the adjusting operation member 6 It is not operated.

That is, when the adjustment operation member 6 is locked, the operation portion 6a of the adjustment operation member 6 is covered with the closing plate 12 and cannot be seen by the user. Can not be operated. When operating the adjusting operation member 6, the lock is first released and the hole 7 is opened, and then the rotating operation of the adjusting operation member 6 is performed. No damage occurs. As described above, according to the adjustment mechanism of the present embodiment, safe and proper operation can be expected, and there is no complaint unlike the related art.

Further, the structure of this adjusting mechanism is very simple, that is, it is a simple structure in which the closing plate 12 is added to the conventional adjusting mechanism, so that it can be easily implemented.

[0022]

[0023]

As described above, in the present invention,
In the state where the adjustment operation member is locked, the first hole for operation of the adjustment operation member is closed by the closing plate, and when operating the adjustment operation member, the lock is released first to open the first hole, and then, Due to the configuration in which the adjusting operation member is rotated, the user cannot perform an unreasonable operation because the operating portion of the adjusting operation member cannot be seen unless the lock is released, so that safe and proper operation is not performed. Can be expected. In addition, since the adjusting mechanism has a simple structure, it can be easily implemented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a surveillance camera.

FIG. 2 is a plan view of the surveillance camera.

FIG. 3 is a plan view of a conventional adjusting mechanism incorporated in the monitoring camera.

FIG. 4 is a perspective view illustrating a conventional adjusting mechanism.

FIG. 5 is a side view of a main part of a conventional adjusting mechanism.

FIG. 6 is a plan view of the surveillance camera provided with the adjustment mechanism according to the embodiment, where A is a state where the adjustment operation member is not locked, and B is a state where the adjustment operation member is locked.

FIG. 7 is a perspective view of a main part of the adjustment mechanism of the embodiment.

FIG. 8 is a side view of a main part of the adjustment mechanism of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 1a Outer housing 6 Adjustment operation member 6a Operation part 7 Operation hole (1st hole) 10 Screw hole (2nd hole) 11 Lock screw 12 Closure plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-130278 (JP, A) JP-A-2-213811 (JP, A) JP-A-1-207727 (JP, A) 128633 (JP, U) Japanese Utility Model Showa 55-103606 (JP, U) Japanese Utility Model Showa 61-2611 (JP, U) Japanese Utility Model Utility Model 2-148111 (JP, U) ⁷ , DB name) G02B ⁷ /02-7/105

Claims (1)

(57) [Claims] 1. A camera according to claim 1, wherein a back focus is adjusted in accordance with a focal length of a lens by rotating an adjusting operation member, and said adjusting operation member is locked in a non-rotatable state by a lock screw after said adjustment. In the back focus adjustment mechanism, a first hole and a second hole are formed in an outer housing of the camera body, the adjustment operation member has a disk shape, and an operation unit is provided at a rotation center portion thereof. The adjustment tool is configured to be rotated by inserting an operation tool from the first hole, and the lock screw is rotated to dynamically press the inner end of the lock screw against the adjustment member. Thereby, the rotation operation member is locked in a non-rotatable state, the operation tool is inserted from the second hole, and the lock screw is configured to be rotationally operated, Further, a closing plate is directly fixed to the lock screw,
The lock screw and the closing plate are configured to be integrally rotated. In a state where the adjusting operation member is locked by rotating the lock screw, the first hole is closed by the closing plate. A back focus of the camera, wherein the lock is first released to open the first hole when the adjustment operation member is operated, and then the rotation operation of the adjustment operation member is performed. Adjustment mechanism.