JP2003348398A - Infrared cut/stop integrated apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sharp image regardless of day and night by integrating an apparatus in which an external form dimension is reduced and a mechanism is simplified by integrating a mechanism for switching incidence/shield of infrared rays and a mechanism of a stop blade for adjusting a quantity of light, into a camera lens. <P>SOLUTION: A supporting plate 3 equipped with an opening corresponding to an image pickup part of a monitoring camera lens is mounted with a switching member 5 for switching the incidence and shield of infrared rays to the image pickup part by making an infrared transmitting filter 8 and an infrared shielding filter 9 corresponding to the opening 2 to switch their locations and a stop member 4 for making a stop hole 12 formed by overlapping two stop blades 11 mutually oppositely movable corresponding to the opening 2 and expanding/reducing the stop hole 12 through the respective opposite movements of the stop blades 11 to adjust a quantity of light to the image pickup part. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a surveillance camera lens for continuous shooting day and night, and switches the incidence and cutoff of infrared rays to an image pickup unit side of the surveillance camera, and a light source for clearly displaying an image. The present invention relates to an infrared cut / aperture integrated device for adjusting the amount of light.

[0002]

2. Description of the Related Art Conventionally, in a monitoring camera lens for continuous shooting for 24 hours a day and night, it is necessary to be able to shoot at night or in a place where illumination is turned off. The image is obtained using infrared light. Therefore, some surveillance camera lenses for continuous shooting day and night have an infrared switching mechanism for switching between inputting and blocking infrared rays so that infrared shooting can be performed when necessary. In addition, cameras that do not have a mechanism to switch between incident and blocked infrared rays are sometimes used as surveillance camera lenses for day and night continuous shooting.In such a case, a special filter that enters or blocks infrared rays is used on the camera lens. It is fixed to shoot.

[0003]

The infrared switching mechanism used in the surveillance camera lens for continuous shooting day and night is provided with a special filter when necessary in an optical path reaching an image pickup section comprising a CCD element or the like inside the camera body. The special filter is movably supported so that the movement is controlled using a stepping motor or a DC motor. However, when a stepping motor or a DC motor is used, the rotation speed of the shaft is high, so that a gear for reducing the speed must be provided. In addition, the motor must be reversely rotated in order to perform the switching operation of the special filter, and there is a problem that the mechanism and control circuit therefor are complicated and the external dimensions of the entire camera lens are large, and the price is high. turn into. Furthermore, in the above-described type of switching between the incidence and blocking of infrared light, it is necessary to adjust the amount of light with respect to the imaging unit when switching between the incidence and blocking of infrared light, and a device having a mechanism of incidence and blocking of infrared light, A device having a mechanism for expanding and contracting the aperture member is attached to each camera lens, but there is a problem that miniaturization is difficult. In the type without a special filter, that is, in a monitoring camera lens for continuous shooting day and night without a switching mechanism, an image is shot with the special filter fixed as described above. There is a problem that the image quality is deteriorated and the image in daytime or nighttime becomes unclear. In view of the above circumstances, it is an object of the present invention to integrate a mechanism for switching between the incidence and blocking of infrared rays and a diaphragm mechanism for adjusting the amount of light, and to provide a camera having a small external size and a simple mechanism. It is an object of the present invention to obtain a clear image regardless of day and night by incorporating it in a lens.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has an infrared transmitting filter and an infrared transmitting filter for transmitting infrared light on a support plate having an opening corresponding to an imaging section of a surveillance camera lens. An infrared cutoff filter that cuts off the light is switched to the opening so as to correspond to the opening, and a switching member that switches between the incidence and cutoff of the infrared ray to the imaging unit, and the two diaphragm blades can be moved in opposite directions. An aperture member was formed to adjust the amount of light to the imaging unit by expanding and contracting the aperture hole by moving the aperture blades in opposite directions so as to correspond to the apertures formed by overlapping the apertures. An object of the present invention is to provide an infrared cut-and-aperture integrated device characterized by the above-mentioned features, and to solve the above-mentioned problems.

[0005] In the present invention, a drive unit for a switching member for slidingly moving the switching member with respect to the support plate, and a diaphragm member for slidingly moving the diaphragm blades of the diaphragm member in opposite directions to the support plate. A drive unit is provided side by side on the end side of the support plate, and each of the switching member drive unit and the diaphragm member drive unit is driven by a permanent magnet rotating body having a rotating shaft and a coil wound therearound. A pair of bobbins for generating a magnetic field to rotate the permanent magnet rotating body, a printed wiring board having a mounting hole in which the bobbin is mounted, and a coil terminal of each bobbin located in the mounting hole; And an electric wire connected to the coil terminal of the board and having a detachable connector on the control unit side of the monitoring camera. It is. The switching member drive section has a cylindrical yoke in which the permanent magnet rotating body and the bobbin are arranged. The yoke has a cross-sectional shape that is elliptical, and the switching member drive section that is energized to the bobbin. When the switching member slides by the operation of the section, the infrared transmission filter of the switching member is located at the opening of the support plate and when the infrared cutoff filter is located at the opening of the support plate, the bobbin is not energized. It is preferable to configure the magnetic circuit so that the position of the filter relative to the opening of the support plate is held by the magnetic attraction force generated between the permanent magnet rotating body and the yoke.

In the present invention, an aperture member and a switching member are laminated on the support plate, and the support plate slidably supports the switching member and the aperture member. It is preferable that an attachment portion is provided. Further, it is preferable to connect the coils of the pair of bobbins in the switching member drive section in parallel.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. In the figure, reference numeral 1 denotes an integrated infrared cut / aperture device that switches between incident and cutoff of infrared rays in an optical path reaching an imaging unit of a surveillance camera lens and adjusts an amount of light. In the integrated infrared cut / aperture device 1, an aperture member 4 and a switching member 5 are stacked on a support plate 3 having an opening 2 corresponding to an imaging unit of a monitoring camera lens so as not to come into contact with each other. The diaphragm member 4 and the switching member 5 are slidably supported between the side walls that are arranged and rise up on the long side of the support plate 3. Each side wall of the support plate 3 is integrally provided with a mounting portion 6 formed of a screw hole for setting the infrared cut and aperture integrated device 1 to a casing or a printed circuit board (not shown) on the surveillance camera lens side. Support plate 3
Is fixed to a casing or a printed circuit board on the side of the monitoring camera lens, so that the aperture member 4 and the switching member 5 are slidable and correspond to the imaging unit side.

As shown in FIG. 3, the switching member 5 is formed by attaching an infrared transmitting filter 8 and an infrared blocking filter 9 side by side to a mounting plate 7 having a pair of openings, and is formed in a thin shape. One end of the mounting plate 7 is extended in the longitudinal direction of the support plate, and a connection hole 10 is provided at the end thereof. As shown in FIG. 4, the diaphragm member 4 is formed by superposing two diaphragm blades 11 each having an opening so as to be movable in the longitudinal direction of the support plate 3, and is formed to be thin as a whole. Have been. An overlapping portion of the overlapping openings is formed as a stop hole 12, and by moving the two stop blades 11 in opposite directions, the stop hole 1 is moved.
2 expands and contracts at a fixed position. The aperture blade 1
Each of the switching members 5 has an end on the same side as the mounting plate 7 of the switching member 5 extending in the longitudinal direction of the support plate 3, and a connection hole 13 is provided at the end thereof.

A plurality of projections 14 having different heights are provided on the inner surface side of each of the side walls of the support plate 3, and the projection 14 at a lower position on the support plate 3 side movably supports the switching member 5. In addition, the switching member 5 and the aperture member 4 are separated from each other so as to prevent direct contact between the switching member 5 and the aperture member 4 so that a slight gap is generated. Each of the blades 11 is slidable so that the diaphragm blades 11 do not come off vertically. The upper projection 14 makes the mounting plate 7 of the switching member 5 slidable so that the mounting plate 7 does not come off vertically.

A connecting box 15 is integrally connected to one end of the support plate 3, and an extension of each of the aperture blades 11 of the aperture member 4 and an extension of the mounting plate 7 of the switching member 5 are located on the connection box 15. are doing. In the connection box 15, the switching member drive unit 16 and the aperture member drive unit 17 are provided on a surface of the support plate 3 in a direction opposite to the direction in which the aperture member 4 and the switching member 5 are arranged. Are provided side by side. First, the switching member drive unit 16
The sliding member 5 slides the switching member 5 with respect to the support plate 3 along its longitudinal direction. As shown in FIG. 2, the switching member 5 includes a permanent magnet rotating body 19 having a rotating shaft 18 and a wound coil. A pair of bobbins 20 for rotating the permanent magnet rotator 19 by generating a magnetic field by energizing the permanent magnet rotator 19 so that the permanent magnet rotator 19 is located between the pair of bobbins 20. The bobbin 20 is arranged inside a cylindrical yoke 21, and a disk-shaped printed wiring board 22 is put on the yoke 21 and fixed.

Each of the bobbins 20 has two insertion rods 23 projecting toward the printed wiring board 22. A coil terminal of a coil 24 formed by winding a conductive metal wire is wound around the insertion rod 23. The insertion rod 23 around which the coil terminal is wound is inserted into a mounting hole 25 formed in the printed wiring board 22 and soldered. A coil terminal wound around the insertion rod 23 is exposed on the side of the printed wiring board 22 opposite to the side on which the bobbin 20 is mounted. As described above, the four mounting holes 2 are formed in the printed wiring board 22.
5 and the coil terminals are located at each of them. Then, the four electric wires 26 connected to this location are combined at the other end side, and a connector is provided on the control unit side of the surveillance camera. Although the bobbins 20 have the same configuration, the insertion rod of one bobbin 20 is at a position where it cannot be seen in the drawing.

One end of the rotating shaft 18 of the switching member drive unit 16 is rotatably supported by a bearing 27 on the side of the printed wiring board 22 on which the bobbin 20 is mounted, and the other end is a through hole as a bearing. And is located in the connection box 15 through the bearing hole 28. A rotation arm 29 having one arm is attached to the other end of the rotation shaft 18 in the connection box 15, and the rotation arm 29 is inserted into the connection hole 10 of the attachment plate 7 in the switching member 5. Connected. As described above, the switching member 5 and the switching member drive unit 16 are connected via the rotary arm 29, and the switching member drive unit 16
The rotation arm 29 is rotated within the required angle range by the operation described above, and the switching member 5 is provided so as to slide along the longitudinal direction of the support plate 3. Then, when a current is applied to drive the drive unit 16 and the rotary arm 29 reaches one rotation limit point, one of the filters 8 in the switching member 5 is turned off.
Is provided so as to correspond to the opening 2 of the support plate 3, and a current is applied in the reverse direction to operate the drive unit 16, and the rotary arm 29 rotates in the reverse direction to rotate the other rotation limit point. , The other filter 9 is provided so as to correspond to the opening 2 of the support plate 3.

The aperture member driving section 17 slides the aperture blades 11 of the aperture member 4 in opposite directions along the longitudinal direction of the support plate 3. The aperture member driving unit 17 slides the aperture blade 11 with respect to the support plate 3 along its longitudinal direction, and as shown in FIG. 2, a permanent magnet rotating body 19 having a rotating shaft 18. And a pair of bobbins 20 for generating a magnetic field by energizing the wound coil to rotate the permanent magnet rotating body 19.
Between the permanent magnet rotating body 19
And a bobbin 20 are arranged inside a cylindrical yoke 21, and a disk-shaped printed wiring board 22 is mounted on the yoke 21.
And is fixed.

Each of the bobbins 20 has two insertion rods 23, and the coil terminal of the coil 24 is wound around the insertion rod 23, as in the switching member drive section 16. Stick 23 to printed wiring board 2
2 and then soldered. Further, the electric wires 26 are connected to the respective portions of the printed wiring board 22 where the coil terminals are exposed, and connectors are provided at the other ends of the four electric wires 26.

One end of a rotary shaft 18 of the aperture member driving unit 17 is rotatably supported by a bearing 27 of a printed wiring board 22, and the other end is located in the connection box 15 through a bearing hole 28. A rotating arm 30 having two arms is attached to the other end of the rotating shaft 18 in the connecting box 15, and the two arms of the rotating arm 30 are connected to the connecting holes 13 in the aperture blade 11. are doing. The aperture member 4 and the aperture member drive unit 17 are connected via the rotary arm 30 as described above, and the operation of the aperture member drive unit 17 causes the rotary arm 30 to rotate within a required angle range, and the aperture blade 11 is provided so as to slide along the longitudinal direction of the support plate 3. For example, when a current is applied to operate the driving unit 17 and the rotary arm 30 rotates toward one rotation limit point, the aperture blades 11 are reduced so that the aperture hole 12 becomes smaller at a position corresponding to the opening 2. Each of them is slid so that when the rotation arm 30 reaches the rotation limit point, the aperture hole 12 is provided at the position of the opening 2 so as to be in the minimum state. When a current is applied in the opposite direction to operate the drive unit 17 and the rotary arm 30 rotates toward the other rotation limit point, the aperture blades are opened so that the aperture hole 12 opens at a position corresponding to the opening 2. 11 respectively slide and when the rotating arm 30 reaches the other rotation limit point,
The aperture hole 12 is provided at the position of the opening 2 so as to be in the maximum state. The aperture member 4 and the aperture member drive unit 1
A spring 31 is for applying a brake to the operation of the diaphragm blade 11 in the rotary arm 30 that connects the rotary arm 7 to the rotary arm 7.

In each of the switching member drive unit 16 and the throttle member drive unit 17, the electric connection of the coils of the pair of bobbins is connected in parallel to increase the driving torque. In the upper example, the switching member driving unit 1 is used.
Although the coils of the pair of bobbins are connected in parallel in both of the diaphragm member drive unit 17 and the diaphragm member drive unit 17, it is not always necessary to connect the coils in the diaphragm member drive unit 17 in parallel.

In the switching member driving section 16,
When the infrared transmission filter 8 of the switching member 5 is located at the opening 2 of the support plate 3 and when the infrared cutoff filter 9 is
The magnetic circuit is configured to be able to hold the positions of the filters 8 and 9 facing the opening 2 without continuous energization when the filter is located at the position. As shown in FIG. 5, the yoke 21 of the switching member drive section 16 has an elliptical cross-sectional shape, and the direction of the magnetic poles of the permanent magnet rotating body 19 when power is not supplied is good for the magnetic flux efficiency of the yoke 21. It does not change in the short axis direction, and when the permanent magnet rotating body 19 stops with the magnetic poles oriented in the short axis direction of the yoke 21, the infrared transmission filter 8 is located in the opening 2,
The infrared cutoff filter 9 is set so as to be located in the opening 2. Accordingly, the operation of the switching member drive unit 16 that is energized to the bobbin 20 causes the rotation arm 29
Is rotated in one direction, and the switching member 5 slides. However, if the power supply to the bobbin 20 is stopped when the infrared transmission filter 8 is located at the opening 2, as long as the bobbin 20 is kept in the non-conductive state, Due to the magnetic attraction force in the short axis direction generated between the permanent magnet rotating body 19 and the yoke 21, the permanent magnet rotating body 21 is not rotated freely, the direction of the magnetic pole is determined, and since the mounting plate 7 does not slide, the opening is formed. 2 is held relative to the position of the infrared transmission filter 8. In addition, bobbin 20
When the switch arm 5 rotates in the reverse direction by the operation of the switching member driving unit 16 to slide the switching member 5 in the reverse direction, and the infrared cutoff filter 9 is positioned in the opening 2, The energization of the bobbin 20 is stopped. As long as the de-energized state of the bobbin 20 continues, the permanent magnet rotating body 21 does not rotate freely due to the magnetic attraction force in the short axis direction generated between the permanent magnet rotating body 19 and the yoke 21 and the direction of the magnetic pole is changed. Since the mounting plate 7 is determined and does not slide, the position of the infrared cutoff filter 9 relative to the opening 2 is maintained. By doing so, the state in which the infrared transmission filter and the infrared cutoff filter are positioned at the opening of the support plate can be maintained without conducting electricity continuously, which is economical.

[0018]

According to the configuration of the present invention described above, the switching member for switching the incidence and blocking of infrared rays and the diaphragm member for adjusting the amount of light are integrated, so that the monitoring camera lens can be used for the imaging unit. It is possible to reduce the size of a device having both the incidence and blocking of infrared rays and the adjustment of the amount of light, and to simplify the mechanism. In addition, it is possible to provide a device that combines the incidence and blocking of infrared rays and the adjustment of the amount of light at a low price, and contributes to weight reduction. Furthermore, since the filter can be switched, setting this device in the imaging section of the surveillance camera lens enables shooting in an appropriate state, enabling clear images to be obtained regardless of day or night. It has excellent effects.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of an infrared cut / aperture integrated device according to the present invention.

FIG. 2 is an explanatory view showing an example in an exploded state.

FIG. 3 is an explanatory view showing a switching member.

FIG. 4 is an explanatory view showing a diaphragm member.

FIG. 5 is an explanatory view showing a switching member drive unit.

[Explanation of symbols]

1. Infrared cut and aperture integrated device 2 ... Opening 3 ... Support plate 4 ... Aperture member 5. Switching member 8 ... Infrared transmission filter 9 ... Infrared cutoff filter 11 ... Aperture blade 12 ... aperture 16 ... Switching member drive unit 17 ... Driving unit for diaphragm member 19: permanent magnet rotating body 20 ... Bobbin 21 ... Yoke

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 15/00 G03B 15/00 S

Claims (5)

[Claims] 1. A support plate having an opening corresponding to an imaging section of a surveillance camera lens, wherein an infrared transmission filter for transmitting infrared light and an infrared cutoff filter for blocking infrared light are switchably arranged in said opening. A switching member for switching between input and cutoff of infrared rays to the image pickup unit; and an aperture formed by superimposing two aperture blades so as to be movable in opposite directions to each other. An infrared cut / aperture integrated device, comprising: a diaphragm member for adjusting the amount of light to an imaging unit by expanding / contracting a diaphragm hole by moving the blades in opposite directions. 2. A switching member drive unit for slidingly moving the switching member with respect to the support plate, and a diaphragm member drive unit for slidingly moving diaphragm blades of the diaphragm member in opposite directions to the support plate. Are provided side by side on the end side of the support plate, and each of the switching member drive unit and the throttle member drive unit generates a magnetic field by energizing a permanent magnet rotating body having a rotating shaft and a wound coil. A pair of bobbins for generating and rotating the permanent magnet rotating body, a printed wiring board having a mounting hole in which the bobbin is mounted, and a coil terminal of each bobbin located in the mounting hole; The infrared camera according to claim 1, comprising an electric wire connected to the coil terminal and provided with a detachable connector on the control unit side of the surveillance camera. Unit, aperture integrated device. 3. The switching member driving section has a cylindrical yoke in which the permanent magnet rotating body and the bobbin are arranged, and the cross section of the yoke has an elliptical shape. The switching member slides due to the operation of the member driving section, and when the infrared transmission filter of the switching member is positioned at the opening of the support plate and when the infrared cutoff filter is positioned at the opening of the support plate, the switching to the bobbin is stopped. 3. The infrared cut-off / diaphragm according to claim 2, wherein a magnetic circuit is configured to hold a position of the filter facing an opening of the support plate by a magnetic attraction force generated between the permanent magnet rotating body and the yoke in an energized state. Integrated device. 4. A switching member and an aperture member are laminated on the support plate, and the support plate slidably supports the switching member and the aperture member, and the support plate is provided with a mounting portion for the surveillance camera. The integrated infrared cut and aperture device according to any one of claims 1 to 3. 5. The integrated infrared cut and aperture device according to claim 1, wherein a pair of bobbin coils in the switching member drive section are connected in parallel.