JPH07152093A - Explosion-proof industrial monitor camera - Google Patents

Abstract

PURPOSE:To provide an explosion-proof monitor camera whose explosion-proof case is made small in size and light in weight, which is easily set in a narrow place and also which can be used as a portable camera. CONSTITUTION:The case is constituted of a cylindrical front main body 2 provided at the leading end of a rear main body 1 formed as a blind barrel, a focusing barrel 20 provided at the leading end of the main body 2 so that it can freely turn but it is prevented from moving in the axial direction, and a diaphragm barrel 27 provided at the leading end of the barrel 20 so that it can freely turn but it is prevented from moving in the axial direction. A camera 6 is fixed in the rear main body 1. A focus ring 41 and a diaphragm ring 42 are provided in the lens barrel 40 of the camera 6, and the focus ring 41 is coupled with the barrel 20, then the diaphragm ring 42 is coupled with the barrel 27. A hard glass 31 is provided at an aperture at the leading end of the barrel 27.

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 industrial areas such as power plants and oil plants, most industrial surveillance cameras mainly used for surveillance are housed in an explosion-proof case. The surveillance camera according to the conventional technique has a large outer shape and a large weight, and since it is installed in a small place, the installation work is not easy. Also, although this type of surveillance camera is used by fixing it to the installation location, there is a demand to remove it in an emergency and use it as a portable camera. In the prior art, since it has a large outer shape and weight, it cannot be used as a portable camera. There is a problem.

[0003]

SUMMARY OF THE INVENTION The present invention is an industrial surveillance camera to be housed in an explosion-proof case, which can be easily installed in a narrow space by reducing the size of the explosion-proof case and is a portable camera in an emergency. The purpose is to provide an explosion-proof surveillance camera that can be used as.

[0004]

Means for solving the problems in the present invention include a cylindrical front main body provided at the front end of a rear main body formed in a bottomed cylindrical body, and the front cylinder. A focus barrel provided at the tip of the body so as to be rotatable and prevented from moving in the axial direction, and a focus barrel provided at the tip of the focus barrel so as to be rotatable but prevented from moving in the axial direction. And a focus ring and an aperture ring are provided on the lens barrel of the camera, and the focus ring and the focus barrel are connected to each other, and the aperture ring and the aperture ring are connected to each other. It is characterized in that it is coupled with a diaphragm cylinder and that a hard glass is provided in the opening of the front end of the diaphragm cylinder.

[0005]

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

Further, when the diaphragm cylinder 27 is rotated, the holding groove 3
0 rotates the collar 50 and the diaphragm lever 44, whereby the diaphragm ring 42 rotates and the diaphragm is determined.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a sectional view of the entire assembly, and FIG.
3 is an AA sectional view of FIG. 3, FIG. 3 is a BB sectional view of FIG. 1, FIG. 4 is a CC sectional view of FIG. 1, and FIG. 5 is an exploded perspective view of main parts.

In the figure, an explosion-proof case for accommodating a camera is formed in a tubular shape, and a rear main body 1 and a front main body 2 are joined by a screw portion 3. The camera mount 4 is fixed to the opening of the front end of the rear body 1 with a set screw 5. Also, 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 portion 1a of the rear body 1 via a packing 10, and a tip portion thereof projects from the case.

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

The focus cylinder 20 is connected to the inner peripheral portion of the front main body 2 with a joint gap 21 formed therebetween. It should be noted that the focus cylinder 20 is formed with a step-like engagement portion 20 a, and the engagement portion 20 a and the small diameter portion 2 b of the front main body 2 are coupled and the focus cylinder 20 is connected.
Although it is rotatable by a C-shaped retaining ring 22 provided on the above, it is prevented from moving in the axial direction. Reference numeral 23 is an O-ring provided between the front body 2 and the focus cylinder 20. Besides this,
A focus lever operating metal fitting 24 is fixed to a front edge portion of a base end portion of the focus cylindrical body 20 by a set screw 25, and a holding portion 26 having a U-shaped cross section is axially attached to the focus lever operating metal fitting 24. It is formed along.

Further, the tip end of the focus cylinder 20 projects from the front main body 2, and the diaphragm cylinder 27 is connected to the projected inner peripheral portion through a joint gap 28. The aperture cylinder 27 has a stepped engagement portion 27a engaged with the small diameter portion 20b of the focus cylinder 20 and is rotatable by a C-shaped retaining ring 29 provided in the aperture cylinder 27, but in the axial direction. It is assembled so that it will not move. Further, a sandwiching groove 30 parallel to the axial direction is formed on the inner peripheral surface of the diaphragm cylinder 27, and a hard glass 31 is attached to the tip of the hard glass 31.
It is fixed by 2. Incidentally, 33 is an O-ring provided between the focus cylinder 20 and the diaphragm cylinder 27, and 34 is a packing provided between the hard glass 31 and the glass retainer 32.

The camera 6 has a lens barrel 40 having a built-in 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-shaped front surface, and is fixed to each ring by clamps 45 and 46. Four
Reference numerals 7 and 48 are set screws of the clamps 45 and 46. Further, collars 49 and 50 are provided on top of the focus lever 43 and the aperture lever 44.

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

The embodiment has the above-mentioned structure, and the surveillance camera is installed at a desired position, and the focus cylinder 20 and the diaphragm cylinder 27 are rotated to determine the focal length and the diaphragm.
That is, when the focus cylinder 20 is rotated, the focus lever actuating metal fitting 24 is engaged with the collar 49 of the focus lever 43, so that the focus ring 41 is rotated in conjunction with the rotation of the focus cylinder 20. To determine the proper focal length.

On the other hand, when the diaphragm cylinder 27 is rotated, the diaphragm lever 44 is rotated by the collar 50, which causes the diaphragm ring 42 to rotate in conjunction with each other to determine an appropriate diaphragm.

When the surveillance camera is installed and used, the rear main body 1 is assembled to a mount (not shown) or the like, but it can also be used as a portable camera.

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

The joint gap 21 between the front main body 2 and the focus cylinder 20 and the focus cylinder 20 and the diaphragm cylinder 27 are provided.
Each of the joint gaps 28 for preventing the escape of the explosion flame in the explosion-proof device prevents the explosion flame from the vicinity of the connector 8 connected to the camera 6 from flowing out of the case.

[0019]

Industrial Applicability According to the present invention, the industrial camera for surveillance is housed in the explosion-proof case, and the focal length and the diaphragm can be determined by rotating the case. Therefore, maintenance and inspection after installation can be performed. Besides being easy, it has the effect of being portable and portable because it is small and lightweight.

[Brief description of drawings]

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

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

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

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

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

[Explanation of symbols]

 1 Rear Main Body 1a Bottom Part 2 Front Main Body 2b Small Diameter Part 3 Screw Part 4 Camera Mounting Base 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 metal fitting 25 Set screw 26 Clamping part 27 Drawing barrel 27a Engaging part 28 Joining gap 29 C-shaped retaining ring 30 Clamping Groove 31 Hard glass 32 Glass retainer 33 O-ring 34 Packing 40 Lens barrel 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

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneki Kamiki 3-3-22 Nakanoshima, Kita-ku, Osaka City Kansai Electric Power Co., Inc. (72) Etsuji Nishizaki 3-22 Nakanoshima, Kita-ku, Osaka Kansai Denryoku Co., Ltd. (72) Inventor Masanobu Nagao 3-6-26 Tenjinbashi, Kita-ku, Osaka City Ogimachi Park Building Anan Electric Co., Ltd. (72) Inventor Yoshitomo Fujiwara 3-11-22 Omori-nishi, Ota-ku, Tokyo No. Mori Electric Co., Ltd. (72) Inventor Yoshiaki Kuwahara 3-11-22 Omorinishi, Ota-ku, Tokyo Mori Electric Co., Ltd.

Claims (3)

[Claims] 1. A tubular front main body provided at a front end of a rear main body formed in a bottomed cylinder, and a front end of the front cylinder that is rotatable and axially movable. And a focus tube body provided in a fixed manner, and an aperture tube body that is rotatable at the tip of the focus tube body but is prevented from moving in the axial direction. The surveillance camera is fixed to the rear body. Then, a focus ring and an aperture ring are provided in the lens barrel of the camera, the focus ring and the focus barrel are coupled, the aperture ring and the aperture barrel are coupled, and the tip of the aperture barrel is connected. Explosion-proof industrial surveillance camera characterized by having hard glass in the opening. 2. A focus lever provided on a focus ring provided on a lens barrel, wherein a focus lever actuating metal fitting is provided at a base end of the focus barrel having a sandwiching portion having a U-shaped cross section parallel to the axial direction. The explosion-proof industrial surveillance camera according to claim 1, wherein the focus lever working metal fitting is engaged with the focus lever working metal fitting. 3. A diaphragm groove is formed on an inner peripheral surface of the diaphragm cylinder parallel to the axial direction, and a diaphragm lever provided on a diaphragm ring provided on the lens cylinder is engaged with the sandwich groove. The explosion-proof industrial surveillance camera according to claim 1.