KR200462084Y1 - Filter change assembly for closed circuit television camera - Google Patents

Abstract

Disclosed is a filter switching assembly of a CD camera, in which a plurality of filters are provided in front of a CCD to filter an image incident on a lens through a selected filter. A filter switching assembly of a CCD camera installed between an image sensor and a lens to provide a plurality of filters to filter light incident to the lens through a selected filter, the filter switching assembly being coupled to an upper portion of the PCB substrate and positioned therein. A casing portion; A filter holder part installed to slide in a straight line inside the casing part and having a rack gear formed on one side thereof; A filter unit mounted inside the filter holder and divided into a daytime filter and a nighttime filter; A driving part mounted inside the casing part and having a spur gear meshed with the rack gear of the filter holder part on a driving shaft; And an upper cover part fastened to the upper side of the casing part such that the filter holder part and the driving part are sealed in the casing part.

Description

FILTER CHANGE ASSEMBLY FOR CLOSED CIRCUIT TELEVISION CAMERA

The present invention relates to a filter switching assembly of a CCTV camera, and more specifically, a plurality of filters are provided on the front of the CCD or CMOS image sensor (hereinafter referred to as image sensor) CCTV for filtering the image incident to the lens through the selected filter A filter switching assembly of a camera.

In general, surveillance CCTV cameras provide bright and vivid color images when the illumination of visible light around the subject is sufficient.However, at night when the surroundings are dark, video surveillance cameras are so dark that the subjects cannot be distinguished. Done.

On the other hand, the image sensor used for surveillance CCTV cameras can generate an image in response to not only visible light but also infrared light, so in the daytime, the visible light and infrared wavelength images are simultaneously captured to be different from the colors recognized by the human eye. Is taken.

Accordingly, in the color CCTV camera for surveillance, an infrared ray blocking optical filter is inserted in front of the image sensor so that the visible light can be captured by the image sensor. As a result, the same color as that recognized by the human eye can be reproduced. However, light transmission loss occurs due to the use of the optical filter for blocking infrared rays. As a result, the light utilization efficiency of the image sensor is reduced, so that the low light performance (performance on the brightness of the image generated under the low illuminance of a subject) in general surveillance color CCTV cameras is weaker than that of a black and white CCTV camera without an infrared blocking optical filter. 1/10 level.

In order to improve the low light performance of surveillance color CCTV cameras to solve this problem, the optical filter for blocking infrared rays located on the front of the image sensor can be properly inserted / removed by using a physical drive (small motor) during the day and night. The apparatus to make is used. The device is equipped with a dummy filter without an infrared cut-off function for correcting a change in focus of an image caused by a change in the light transmission medium between the lens and the image sensor when the infrared cut-off filter is removed.

On the other hand, as an example of such an apparatus, Patent Publication No. 2002-52155 titled: a filter change assembly for a camera module; Hereinafter referred to as filter change assembly).

The conventional filter change assembly is a filter (not shown) connected to the rack gear part 236 through the driven gear 340 by exposing the rack gear part 236 to the guide groove 115 formed in the support 110. It is configured to move in a linear direction. Reference numeral 420: lens holder, 412: screw thread, 410: lens, 510: coupling member, 116: second engagement projection, 344: second gear 310: motor, 320: motive gear, 342: first gear, and 520: It is a PCB.

However, the conventional filter change assembly configured as described above may easily introduce external dust or the like through the guide groove 115 formed in the support 110. Therefore, the image sensor inside the support 110 is easily contaminated, there is a problem that the image of the foreign material appears in the captured image.

In addition, the conventional filter change assembly has a structure in which the prime gear 320, the driven gear 340, and the rack gear part 236 are engaged by a gear. On the other hand, these gears are exposed to the outside of the support 110 to not be protected from the external physical force, foreign matter can easily enter between the gears, in particular formed of a complex connection structure to precise assembly between each gear Nevertheless, the defective rate is high due to tolerances of the parts. In addition, when the CCTV camera is installed in a poor environment of a large temperature change, a small gear coupling part may easily be deformed, causing malfunctions frequently, and device life is also significantly reduced.

In order to solve the above problems, the present invention can minimize the installation space of the filter transfer means installed in the filter replacement assembly, which can reduce the size of the device, and by placing the filter transfer means inside the case, the external physical force or pollution source It is an object of the present invention to provide a filter conversion assembly of a CCTV camera, which can be protected from, and simplifies the coupling structure between the gears, thereby eliminating the cause of the malfunction and significantly improving the life of the device.

The present invention for achieving the above object is a filter switching assembly of the CCTV camera installed between the image sensor and the lens to filter the light incident to the lens through a plurality of filters are provided, coupled to the top of the PCB substrate And a casing part in which the image sensor is located therein; A filter holder part installed to slide in a straight line inside the casing part and having a rack gear formed on one side thereof; A filter unit mounted inside the filter holder and divided into a daytime filter and a nighttime filter; A driving part mounted inside the casing part and having a spur gear meshed with the rack gear of the filter holder part on a driving shaft; And an upper cover part fastened to the upper side of the casing part such that the filter holder part and the driving part are sealed in the casing part.

Partitions are formed on both sides of the casing, and protrusions protruding in the longitudinal direction form rails on the partitions, and grooves coupled with the rails are formed on side surfaces of the filter holders to separate the filter holders toward the upper cover part. It is desirable to slide the inside of the casing.

In the casing part, partition walls are formed on both sides, and one of the partition walls is formed with a protruding partition rail, and one side of the filter holder part is formed with a groove coupled to the partition rail,

The groove of the filter holder part is seated on the partition rail and slides, and a driving part insertion groove into which the driving part is mounted is provided inside the casing part so that the rack gear of the other side of the filter holder part and the spur gear of the driving part are directly connected. The upper cover part may be configured to contact the filter holder part and the upper cover part so that the filter holder part and the driving part are not separated from the front of the casing part.

The casing part has a through groove in which the image sensor is located, a sidewall having a predetermined height is formed at an edge thereof, and an insertion groove in which the driving part is mounted is formed in the casing part, and the driving part is formed in the insertion groove. It can be made to be inserted.

Since the driving unit and the filter holder unit are connected by a simple coupling such as a spur gear and a rack gear directly connected, the transmission of the driving force may be improved by a plurality of gear couplings, and the accuracy and durability of the driving operation may be improved. .

According to the present invention, first, the driving part and the filter holder part are installed in a closed state inside the casing part, thereby preventing contamination from being introduced from outside and attached to the image sensor, and protecting the driving system from external physical forces.

Second, the present invention is connected to the drive unit and the filter holder unit in a simple combination such as the spur gear and the rack gear direct connection, high defect rate due to the lack of assembly precision by a plurality of gear combinations that appeared a problem in the conventional method It is possible to drastically improve the defect occurrence rate due to deformation by long-term driving.

Third, according to the present invention, the entire driving part can be installed in the casing part compactly, so that the camera module can be miniaturized.

1 is a perspective view showing a filter change assembly for a conventional camera module,
2 is an exploded perspective view showing a filter conversion assembly of a CCTV camera according to an embodiment of the present invention;
Figure 3 is a perspective view showing a filter conversion assembly of the CCTV camera according to an embodiment of the present invention,
Figure 4 is a side cross-sectional view of the filter conversion assembly of the CCTV camera according to an embodiment of the present invention,
Figure 5 is a perspective view showing a state in which the upper cover removed in the assembly state of the filter conversion assembly of the CCTV camera according to an embodiment of the present invention, and
Figure 6 is a state diagram showing the internal configuration of the filter conversion assembly of the CCTV camera according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view showing a filter switching assembly of a CCTV camera according to an embodiment of the present invention, Figure 3 is a combined perspective view showing a filter switching assembly of a CCTV camera according to an embodiment of the present invention, Figure 4 is Side cross-sectional view of a filter conversion assembly of a CCTV camera according to an embodiment of the invention.

2 to 4, the filter conversion assembly of the present invention is composed of a casing portion 10 and the upper cover portion 20, the PCB substrate 30, the filter holder portion 40, and the drive unit 50.

The casing part 10 has a sidewall 13 formed at a predetermined height so as to surround the edge, and a driving part insertion groove 11 for mounting the driving part 50 is formed in a part thereof. In addition, a pair of partitions 16 and 17 are formed on the inner side to face each other, one of the side walls 16 has a partition rail 15 formed therein, and an inner bottom surface thereof has a rail groove 18 in the longitudinal direction (FIG. 5). And FIG. 6). At this time, the through groove 12 is formed in a predetermined area (preferably a size corresponding to the filter area) between the partitions (16, 17).

The upper cover part 20 may include a coupling hole 22 for coupling to the casing part 10, and may include a lens mounting end 21 on which a lens (not shown) is mounted. At this time, the upper cover portion 20 and the casing portion 10 are coupled to each other through a plurality of bolts (A) mounted on the coupling hole 22 to form a sealed state inside the casing portion 10.

An image sensor 32 is formed at the center of the PCB substrate 30. An image sensor such as a CCD or a CMOS may be employed as the image sensor 32. In addition, a plurality of bolt fastening holes may be formed in the PCB board 30 to fix the casing unit 10 to the PCB board 30 through the bolt B.

The filter holder 40 has a rack gear 43 formed on one side thereof in the longitudinal direction, and a groove 44 is formed on the other side of the filter holder 40 in the longitudinal direction. In addition, a guide protrusion 49 (FIG. 4) inserted into the rail groove 18 of the casing part 10 is formed at the bottom thereof in the longitudinal direction, and a mounting groove 45 is formed at the inner side thereof so that the filter is mounted on the mounting groove 45. (41,42) can be combined. In this case, the filters 41 and 42 may be classified into an infrared cut filter 41 for daytime and a dummy filter 42 for glass at night. The filter holder 40 configured as described above is a straight line along the partition rail 15 and the rail groove 18 (FIGS. 5 and 6) inside the casing portion 10 with heterogeneous filters 41 and 42 mounted thereon. Slide is possible.

The drive unit 50 is composed of a motor 52 for providing a driving force and a spur gear 51 connected to the drive shaft thereof, the spur gear 51 of the drive unit 50 is the rack gear ( 43) to engage with it. Accordingly, the spur gear 51 may be driven by the driving force of the motor 52 and the filter holder 40 engaged with the spur gear 51 may be moved within the casing 10.

In addition, when the motor 52 is inserted into the driving portion insertion groove 11, the rack gear 43 of the holder portion 40 and the spur gears 51 of the driving portion 50 are engaged with each other, and in this state the rack gear ( 43 and the spur gear 51 are not separated to the outside by the upper cover part 20.

As such, the daytime filter 41 and the nighttime filter 42 may be moved by the driving force of the driving unit 50 to be switched to match the optical center of the image sensor through the through groove 12 of the casing unit 10. have.

Hereinafter, the state of use of the filter conversion assembly of the CCTV camera of the present invention will be described with reference to the drawings.

Figure 5 is a perspective view showing a state in which the upper cover removed in the assembly state of the filter conversion assembly of the CCTV camera according to an embodiment of the present invention, Figure 6 is an interior of the filter conversion assembly of the CCTV camera according to an embodiment of the present invention This is a state diagram showing the configuration.

5 and 6, the driving unit 50 and the filter holder unit 40 are mounted in the casing unit 10. In this state, when the upper cover part 20 is fastened to the front of the casing part 10, the driving part 50 and the filter holder part 40 are positioned inside the casing part 10 in a sealed state. Of course, in this case, the lens mounting end 21 may be provided so that a lens (not shown) may be mounted on the upper cover part 20. As such, the inside of the casing part 10 is closed, thereby preventing the contamination source (for example, dust or moisture) from the outside from flowing into the filter or the driving part 50.

In addition, since the spur gear 51 of the driving unit 52 and the rack gear 43 of the filter holder unit 40 are connected by a simple coupling in a direct connection method, a plurality of gear couplings, which have appeared to be a problem in the conventional method, It is possible to drastically improve a high failure rate due to lack of assembly precision or a failure rate due to deformation due to long-term driving.

Although the present invention has been illustrated and described with respect to specific optimal embodiments, the present invention is not limited to the above-described embodiments, and those of ordinary skill in the art to which the present invention pertains should have the following claims. Various changes may be made without departing from the spirit of the technical idea of the present invention as described.

10: casing part 11: drive part insertion groove
13: side wall 15: bulkhead rail
16: bulkhead 17: bulkhead
20: upper cover 21: lens mounting end
22: hole 30: PCB substrate
32: image sensor 40: filter holder
43: rack gear 45: mounting groove
50: drive unit 51: spur gear
52: motor

Claims (4)

A filter switching assembly of a CCTV camera provided between a lens and an image sensor to provide a plurality of filters to filter light incident on the lens through the selected filter,
A casing unit coupled to an upper portion of a PCB substrate and having the image sensor located therein;
A filter holder part installed to slide in a straight line inside the casing part and having a rack gear formed on one side thereof;
A filter unit mounted inside the filter holder and divided into a daytime filter and a nighttime filter;
A drive unit mounted inside the casing unit and having a gear on the drive shaft engaged with the rack gear of the filter holder unit; And
An upper cover part fastened to an upper side of the casing part such that the filter holder part and the driving part are sealed in the casing part,
Partition walls are formed at both sides of the casing portion, and partition walls rails protruding in the longitudinal direction are formed at the partition walls, and grooves coupled to the partition rails are formed at the side of the filter holder portion, so that the filter holder portion is formed inside the casing. Filter switching assembly of the CCTV camera, characterized in that sliding. delete The method according to claim 1,
A driving part insertion groove in which the driving part is mounted is formed in the casing part so that the rack gear on the other side of the filter holder part and the gear of the driving part are directly connected to each other.
And the upper cover part contacts the filter holder part and the upper cover part so that the filter holder part and the driving part are not separated in front of the casing part. The method according to claim 1 or 3,
The filter holder portion is provided with a guide protrusion in the longitudinal direction at a position opposite to the groove of the filter holder portion,
Filter conversion assembly of the CCTV camera, characterized in that the rail groove is formed in the casing portion so that the guide projection is inserted.

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