JP4200814B2 - Flange back adjustment mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flange back adjustment mechanism used for a monitoring camera device or the like for imaging with an image sensor, and more particularly to a flange back adjustment mechanism that can share a C mount type lens and a CS mount type lens and can be miniaturized.
[0002]
[Prior art]
A flange back adjustment mechanism used in a conventional surveillance camera device is provided with a lens mount for mounting a lens provided in a casing of a television camera, and in the casing in parallel with the optical axis of the lens mount. A pair of guide members, and a prism base member to which a spectral prism having a plurality of imaging elements positioned and attached to a light emitting portion is fixed. The prism base member is movably attached to the pair of guide members, and the prism On one side of the base member, there is provided a U-shaped attachment portion for attaching an adjustment member for moving the prism base member in the optical axis direction.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-177754 (FIG. 4)
[0004]
[Problems to be solved by the invention]
The conventional flange back adjusting mechanism is configured as described above, and has the following problems.
(1) In the conventional flange back adjustment mechanism, the adjustment member is moved back and forth to adjust the flange back. On the other hand, there are a C mount type and a CS mount type for the monitoring lens, and each flange back is 17.526 mm for the C mount type and 12.5 mm for the CS mount type. In other words, in order to share the C mount type and the CS mount type, it is necessary to make the moving distance of the adjusting member at least 5.02 mm. Is required. However, if the gap is too wide, dust or the like may enter and adhere to the image sensor or the like.
[0005]
(2) In the conventional flange back adjustment mechanism, the pair of guide members prevent backlash at the time of flange back adjustment. However, in the conventional configuration, since a contact area is reduced by inserting a spring between the prism base member and the guide member, rattling occurs. For this reason, in the conventional configuration, the play is prevented by increasing the diameter of the pair of guide members to increase the contact area. However, in order to increase the diameter of the guide member, it is necessary to widen the width of the television camera, and the entire television camera is increased in size accordingly.
[0006]
(3) In the conventional flange back adjusting mechanism, the knob portion for rotating the adjusting member is also inserted into the television camera, so that the entire television camera is enlarged accordingly.
[0007]
The present invention has been made to solve the above-described problems, and an object thereof is to obtain a flange back adjustment mechanism capable of reducing the size of the entire camera and narrowing the gap with the outside to prevent entry of dust and the like. And
[0008]
[Means for Solving the Problems]
The flange back adjustment mechanism according to the present invention includes a lens mount that is integrally provided on the front panel of the camera, a guide shaft that is provided integrally on the inside of the front panel and protrudes in parallel with the imaging direction of the camera, and the lens mount. A holder unit that holds the image sensor of the camera coaxially, a bearing unit that is provided integrally with the holder unit and has a predetermined length and slides on the guide shaft, and a front panel that is separated from the guide shaft A first sliding portion provided in parallel to the imaging direction of the camera, and a second sliding portion provided integrally with the holder portion and sliding with the first sliding portion. is there.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 of the Invention
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a surveillance camera device equipped with a flange back adjusting mechanism shown in Embodiment 1 of the present invention. In the figure, 1 is a surveillance camera device, 2 is a front panel, 3 is a cover, 4 is a mount, 5 is a rear panel, 6 is an adjustment ring, and 7 is a lens mount. The lens mount 7 is provided to attach a C-mount type or CS-mount type monitoring lens, and is integrated with the front panel 2.
[0010]
FIG. 2 is an exploded perspective view of the flange back adjusting mechanism shown in the first embodiment of the present invention. 3 is a cross-sectional view of the flange back adjusting mechanism shown in FIG. 2, and FIG. 4 is a rear view of the flange back adjusting mechanism shown in FIG. In the figure, a guide shaft 8 is integrally provided on the inner side of the front panel 2 so as to protrude in parallel with the imaging direction, and a holder 10 holds an imaging element 15 coaxially with the lens mount 7. The bearing portion 21 provided integrally with the holder 10 has a length that allows the guide shaft 8 to pass therethrough and slides along the guide shaft 8 to prevent backlash. Further, the convex portion 9 provided in parallel to the imaging direction on the inner side of the front panel 2 separated from the guide shaft 8 slides with the concave portion 22 provided integrally with the holder 10 to suppress the rotation of the holder 10.
[0011]
Further, the low-pass filter 14, the image sensor 15 and the plate 16 are integrated with the holder 10 and pressed by the substrate 17, and then fixed by a tapping screw 18. Further, the front panel 2 is provided with an insertion hole 23 through which the adjustment ring 6 is inserted, and the male screw portion 24 provided in the adjustment ring 6 is provided at a position facing the insertion hole 23 of the holder 10. And screw together. Further, a spring 12 is inserted between the adjustment ring 6 and the female screw portion 11 and biased toward the holder 10. In addition, an E-ring 13 is attached to the tip of the adjustment ring 6 in order to limit the backward movement. In addition, after the holder 10 is assembled in the front panel 2, the holder front 19 is fixed with the bind screw 20.
[0012]
Next, details of each part will be described. The configuration for preventing rattling of the flange back adjusting mechanism of the present invention effectively uses the gap in the optical axis direction of the front panel 2. That is, the guide shaft 8 is provided at a position away from the lens mount 7 of the front panel 2 and is inserted into the bearing portion 21 having a length that can slide by sliding with the guide shaft 8 to prevent backlash. It is carried out. Further, unlike the prior art, since no spring is inserted between the guide shaft 8 and the bearing portion 21, the sliding length between the guide shaft 8 and the bearing portion 21 can be made sufficiently long. A sufficient contact area that can prevent backlash can be obtained without increasing the thickness. That is, the width of the front panel 2 can be made narrower than before, and the entire camera can be downsized.
[0013]
Further, by providing the space portion 26 around the bearing portion 21 of the holder front 19, the flange back adjustment range can be widened, and the sliding length between the guide shaft 8 and the bearing portion 21 can be made longer. This prevents further backlash. Further, since the sliding range between the guide shaft 8 and the bearing portion 21 can be made sufficiently long, the flange back adjustment length can be set to 5.02 mm or more at least, and the C mount type and CS mount Any type of lens can be used.
[0014]
Further, by arranging the knob portion 25 of the adjustment ring 6 on the front surface of the front panel 2, the space in the front panel 2 is not taken up by the knob portion 25, and the entire front panel 2 can be downsized. Further, in the configuration of the present invention, only the gap between the insertion hole 23 and the adjustment ring 6 communicates with the outside, and if the gap between the insertion hole 23 and the adjustment ring 6 is narrowed, entry of dust or the like can be prevented. . Further, the E-ring 13 is attached to the tip of the shaft portion of the adjustment ring 6 via the front panel 2 and the holder 10 to prevent the adjustment ring 6 from coming off.
[0015]
【The invention's effect】
According to this invention, the flange back adjustment mechanism is provided with the lens mount integrally on the front panel of the camera, the guide shaft protruding in parallel with the imaging direction of the camera is integrally provided on the inside of the front panel, and the holder portion is The image sensor of the camera is held coaxially with the lens mount, a bearing portion having a predetermined length and sliding with the guide shaft is provided integrally with the holder portion, and the first sliding portion is formed with the guide shaft. Since the second sliding part that slides with the first sliding part is provided integrally with the holder part on the inner side of the separated front panel in parallel with the imaging direction of the camera, the guide shaft and the bearing part The sliding length can be made sufficiently long, and there is an effect that it is possible to take a sufficient contact area that can prevent backlash without making the guide shaft and the bearing portion thick.
[Brief description of the drawings]
FIG. 1 is an external view of a surveillance camera device equipped with a flange back adjustment mechanism according to Embodiment 1 of the present invention.
FIG. 2 is an exploded perspective view of the flange back adjusting mechanism shown in Embodiment 1 of the present invention.
3 is a cross-sectional view of the flange back adjusting mechanism shown in FIG. 2. FIG.
4 is a rear view of the flange back adjusting mechanism shown in FIG. 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Surveillance camera apparatus 2 Front panel 6 Adjustment ring 7 Lens mount 8 Guide shaft 9 Convex part 10 Holder 11 Female thread part 12 Spring 15 Image sensor 19 Holder front 21 Bearing part 22 Recess 23 Insertion hole 24 Male thread part 25 Knob part 26 Space Part

Claims (4)

A lens mount integrated on the front of the front panel of the camera;
A guide shaft provided integrally inside the front surface of the front panel and projecting parallel to the imaging direction of the camera;
A holder portion for holding the image sensor of the camera coaxially with the lens mount;
Only set integrally with the holder portion, and a bearing portion which slides the upper Symbol guide shaft,
A first sliding portion provided in parallel with the imaging direction of the guide shaft and spaced side inside the camera on the front panel,
Flange back adjusting mechanism, characterized in that the holder part and only set together, and a second sliding portion slides with the first sliding portion provided on the inner side of the front panel. An insertion hole provided on the front surface of the front panel;
A flange back adjustment screw that is inserted into the front panel from the insertion hole;
Only set integrally with the holder portion, the flange back adjustment screw screwed to the flange back adjusting mechanism as in claim 1, wherein said that the example Bei and a screw hole. The flange back adjusting mechanism according to claim 2, wherein a knob portion of the flange back adjusting screw is provided outside the front surface of the front panel. Flange back adjusting mechanism according to claim paragraphs 1 through the third term, characterized in that a space is provided on an extension of the bearing portion.

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