JP2855248B2 - Explosion-proof industrial surveillance camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof industrial surveillance camera.

[0002]

2. Description of the Related Art In a dangerous place such as a power plant or an oil plant, many industrial surveillance cameras mainly used for surveillance are housed in an explosion-proof case. The conventional surveillance camera has a problem that the outer shape and weight are both large, and the installation work is not easy because the installation place is narrow. In addition, this type of surveillance camera is used by fixing it to an installation place. However, there is a demand to remove it in an emergency and use it as a portable camera. There is a problem.

[0003]

SUMMARY OF THE INVENTION The present invention relates to an industrial surveillance camera housed in an explosion-proof case, which is easy to install in a narrow place by reducing the size and weight of the explosion-proof case, and is a portable camera in an emergency. It is intended to provide an explosion-proof surveillance camera that can be used as a camera.

[0004]

Means for solving the problems in the present invention are: a cylindrical front body provided at the tip of a rear body formed in a bottomed cylinder; and a front cylinder. A focus cylinder provided rotatably at the distal end of the body and prevented from moving in the axial direction, and a focus cylinder provided rotatably at the distal end of the focus cylinder but prevented from moving in the axial direction. A focus cylinder and an aperture ring are provided on the lens barrel of the camera, and the focus ring and the focus cylinder are connected to each other. It is characterized in that a hard glass is provided at an opening at the tip end of the stop cylinder while being connected to the stop cylinder.

[0005]

The surveillance camera is installed at a desired position, and the focus cylinder 20 and the aperture cylinder 27 are rotated to determine the focal length and the aperture. When the focus cylinder 20 is rotated, the focus lever operating bracket 24 rotates the focus ring 41 together with the focus lever 43 and the collar 49, and the focal length is determined.

When the stop cylinder 27 is rotated, the holding groove 3
0 rotates the collar 50 and the aperture lever 44, whereby the aperture ring 42 rotates and the aperture is determined.

[0007]

FIG. 1 is a cross-sectional view of the entire assembly, and FIG.
3 is a sectional view taken along line BB of FIG. 1, FIG. 4 is a sectional view taken along line CC of FIG. 1, and FIG. 5 is an exploded perspective view of main components.

In FIG. 1, an explosion-proof case accommodating a camera is formed in a tubular shape, and a rear main body 1 and a front main body 2 are connected by a screw portion 3. A camera mount 4 is fixed to a front end opening of the rear body 1 by a set screw 5. A camera 6 protruding toward the front body 2 is fixed to the camera mount 4 by a clamp 7. The camera 6 has a connector 8, a cable 9 connected to the connector 8 is provided on the bottom 1 a of the rear main body 1 via a packing 10, and a distal end protrudes from the case.

Reference numeral 11 denotes a cable gland, 12 denotes a cable clamp, 13 denotes a ground cover connected to the bottom 1a of the rear body 1 by a screw portion 14, 15 denotes a packing provided between the rear body 1 and the ground cover 13, and 16 denotes a packing. This is an O-ring provided between the rear body 1 and the front body 2.

A focusing cylinder 20 is connected to the inner peripheral portion of the front main body 2 so as to form a joining gap 21. The focus cylinder 20 has a stepped engagement portion 20a formed therein. The engagement between the engagement portion 20a and the small-diameter portion 2b of the front body 2 and the focus cylinder 20
Are rotatable but are prevented from moving in the axial direction. Reference numeral 23 denotes an O-ring provided between the front body 2 and the focus cylinder 20. In addition,
A focus lever actuating bracket 24 is fixed to the front edge of the base end of the focus cylinder 20 with a set screw 25. Are formed along.

The front end of the focus cylinder 20 protrudes from the front body 2, and an aperture cylinder 27 is connected to the protruding inner peripheral portion through a joining gap 28. The aperture barrel 27 has a stepped engagement portion 27a and a small diameter portion 20b of the focus cylinder 20 engaged with each other, and can be rotated by a C-shaped retaining ring 29 provided on the aperture barrel 27, but in the axial direction. It is assembled so that it does not move. A holding groove 30 is formed in the inner peripheral surface of the stop cylinder 27 in parallel with the axial direction, and a hard glass 31 is provided at the tip end with a glass holder 3.
2 fixed. Reference numeral 33 denotes an O-ring provided between the focus cylinder 20 and the aperture cylinder 27, and reference numeral 34 denotes a packing provided between the hard glass 31 and the glass presser 32.

The camera 6 has a lens barrel 40 containing a lens, and the lens barrel 40 is open toward the hard glass 31. The lens barrel 40 is provided with a focus ring 41 and an aperture ring 42, and the focus ring 41 has a focus lever 4
3, an aperture lever 44 is fixed to the aperture ring 42. These focus lever 43 and aperture lever 4
4 has a crescent shape in front, and is fixed to each ring by clamps 45 and 46. 4
7 and 48 are set screws of the clamps 45 and 46. Further, collars 49 and 50 are provided at the tops of the focus lever 43 and the aperture lever 44.

The collar 49 of the focus lever 43 is provided with the focus lever operation fitting 2 provided on the focus cylinder 20.
4 and the collar 50 of the aperture lever 44 is engaged and accommodated in the clamping groove 30 formed on the inner peripheral surface of the aperture cylinder 27, and The body 20 is rotated to rotate the focus ring 41, and the aperture barrel 27 is rotated to rotate the aperture ring 42.

In the embodiment described above, the surveillance camera is installed at a desired position, and the focal length and the aperture are determined by rotating the focus cylinder 20 and the aperture cylinder 27.
That is, when the focus cylinder 20 is rotated, the focus lever 41 is engaged with the collar 49 of the focus lever 43, so that the focus ring 41 rotates in conjunction with the rotation of the focus cylinder 20. To determine an appropriate focal length.

On the other hand, when the stop cylinder 27 is turned, the stop lever 44 is turned by the collar 50, whereby the stop ring 42 turns in conjunction with it to determine an appropriate stop.

When the surveillance camera is installed and used, the rear main body 1 is assembled on a mount (not shown) or the like, but can be used for portable use.

Incidentally, in the embodiment, the size of the entire case is 90 mm at the portion having the largest diameter, the length is 195 mm, and the weight is about 3 kg.

The joint gap 21 between the front body 2 and the focus cylinder 20 and the focus cylinder 20 and the aperture cylinder 27
The joint gap 28 prevents the explosion flame from escaping in the explosion-proof equipment, and prevents the explosion flame from near the connector 8 connected to the camera 6 from flowing out of the case.

[0019]

According to the present invention, an industrial camera for surveillance is housed in an explosion-proof case. Since the focal length and the aperture can be determined by rotating the case, maintenance and inspection after installation are easy. In addition to the simplicity, there is an effect that it can be used as a portable because it is small and lightweight.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an entire assembly.

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

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along the line CC of FIG. 1;

FIG. 5 is an exploded perspective view of main components.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear main body 1a Bottom part 2 Front main body 2b Small diameter part 3 Screw part 4 Camera mount 5 Set screw 6 Camera 7 Clamp 8 Connector 9 Cable 10 Packing 11 Cable gland 12 Cable clamp 13 Ground cover 14 Screw part 15 Packing 16 O-ring 20 Focus cylinder 20a Engagement part 20b Small diameter part 21 Joining gap 22 C-shaped retaining ring 23 O-ring 24 Focus lever actuating bracket 25 Set screw 26 Nipping part 27 Aperture cylinder 27a Engaging part 28 Joining gap 29 C-shaped retaining ring 30 Nipping Groove 31 Hard glass 32 Glass holder 33 O-ring 34 Packing 40 Lens cylinder 41 Focus ring 42 Aperture ring 43 Focus lever 44 Aperture lever 45 Clamp 46 Clamp 47 Set screw 48 Set screw 49 Color 50 Color

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Etsuji Nishizaki 3-3-22 Nakanoshima, Kita-ku, Osaka City Inside Kansai Electric Power Co., Inc. (72) Inventor Masanobu Nagao 3-6-26 Tenjinbashi, Kita-ku, Osaka Ogimachi Park Building Anan Electric Co., Ltd. (72) Inventor Yoshitomo Fujiwara 3-11-22 Omori Nishi, Ota-ku, Tokyo Mori Electric Machinery Co., Ltd. (72) Inventor Yoshiaki Kuwahara 3-11-22 Omori Nishi, Ota-ku, Tokyo Mori (58) Field surveyed (Int.Cl. ⁶ , DB name) G03B 29/00 G02B 7/02 G03B 17/02 H04N 5/225

Claims (3)

(57) [Claims] 1. A cylindrical front body provided at a front end of a rear body formed in a bottomed cylindrical body, and a front end of the front cylinder is rotatable and prevented from moving in an axial direction. And a stop cylinder provided rotatably at the tip end of the focus cylinder but prevented from moving in the axial direction, and a surveillance camera is fixed to the rear body. A focus ring and an aperture ring are provided on the lens barrel of the camera, the focus ring and the focus cylinder are coupled, the aperture ring and the aperture cylinder are coupled, and a tip of the aperture cylinder is provided. An explosion-proof industrial surveillance camera characterized by providing hard glass at the opening. 2. A focus cylinder having a focus lever actuating bracket having a U-shaped cross section parallel to the axial direction at a base end thereof, and a focus lever provided on a focus ring provided on the lens cylinder. The explosion-proof industrial surveillance camera according to claim 1, wherein the focus lever working bracket is engaged with the focus lever working bracket. 3. An aperture tube is provided with a holding groove parallel to the axial direction on an inner peripheral surface of the stop cylinder, and an aperture lever provided on an aperture ring provided on the lens barrel is engaged with the holding groove. The explosion-proof industrial surveillance camera according to claim 1.