KR101141211B1 - Diaphragm device - Google Patents

Abstract

The present invention aims to reduce the size and weight of an aperture device including an optical filter freely inserted and removed on an optical path, and to be easily attached to the lens barrel of a CCTV camera.

Aperture substrate 10 having an opening 10a for forming an optical path, aperture blades 12 and 13 arranged on one of the plate surfaces of the aperture substrate and sliding along the plate surface, and aperture drives for driving the aperture blades Apparatus 20, an optical filter 152, and filter driving means for inserting or removing the optical filter onto the optical path, and having the optical filter 152 formed into a thin film shape, and integrated into a separately formed sheet-shaped filter rim 151. The optical filter unit is placed on one side of the diaphragm substrate and slides along the blade of the diaphragm, and the filter frame is driven by the filter driving device. Install the crank lever section 151b.

Description

Aperture Device {DIAPHRAGM DEVICE}

1 is an exploded perspective view showing the overall configuration of an aperture device according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view showing the overall configuration of an aperture device in a state where an optical filter is attached to a filter rim and unitized.

Fig. 3 is a configuration diagram of the optical filter unit, (a) is an enlarged plan view, (b) is a sectional view seen from the arrow IIIb-IIIb in (a), and (c) is an enlarged view of IIIc in (b).

Fig. 4 is a plan view of the main parts showing the case of the embodiment of the present invention having a protrusion on the filter rim.

Fig. 5 is a plan view of principal parts showing a comparative example in which the filter edges do not have protrusions.

Fig. 6 is a view showing the configuration of the filter drive device, in which (a) is a view showing a state when the optical filter is at an intermediate position between the first position (position on the optical path) and the second position (position off the optical path); (b) is a figure which shows the state when an optical filter is in a 2nd position (position off the optical path), and (c) is a figure which shows the state when an optical filter is in a 1st position (position on an optical path).

FIG. 7 is a perspective view used for illustrating the case where the aperture device according to the embodiment is assembled from the side of the lens barrel. FIG.

Fig. 8 is a schematic configuration diagram showing the relationship between an iris and an optical filter in a conventional CCTV camera system, where (a) shows a state where an optical filter is placed on an optical path, and (b) shows an optical filter. It is a figure which shows the state removed on the optical path.

Fig. 9 is a schematic configuration diagram showing a relationship between an iris and an optical filter in another conventional CCTV camera system, (a) showing a state where an optical filter is placed on an optical path, and (b) an optical filter. It is a figure which shows the state remove | eliminated on the optical path.

*** Description of the symbols for the main parts of the drawings ***

1 iris unit 2 lens barrel

10 aperture board 10a opening

12, 13 Aperture wing 12e, 13e Through hole

12f, 13f ND filter 15 Optical filter unit

151 filter frame 151a body

151b Crank lever part (driven part) 151f, 151g protrusion

151h through hole 151k through positioning edge

152 optical filter

20 Aperture drive device (aperture drive means)

30 Filter drive (filter drive) 32 Rotor (permanent magnet)

36 Coil (Stator) 37 Soft Magnetic Material

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical diaphragm device in which an optical filter such as an infrared cut filter is inserted and removed freely on an optical path, and in particular, an diaphragm device incorporated into an imaging device such as a lens for a CCTV (surveillance camera system). It is about.

Day and night surveillance camera system, on the color imaging device (CCD or CMOS, etc.) of the camera body, during the day to form a color image by imaging the light in the visible region, at night in addition to the light in the visible region of the near infrared region Background Art A system has been known in which black and white photography is taken by imaging light and a surveillance image is emitted on a TV monitor (see Patent Document 1, for example).

The system places an infrared cut-off filter in front of the imaging device (in the camera body or lens barrel) during daytime shooting, and performs color photography based only on the visible light, and at night, The infrared cut-off filter is removed from the front of the photographing element, and black-and-white photographs are taken based on the light in the band from the infrared region to the visible region.

8 (a) and 8 (b) are diagrams showing the configuration of a conventional CCTV camera including an infrared cut filter in a camera body.

This CCTV camera consists of a camera body 100A and a lens barrel 200A attached to the front. Inside the camera body 100A, an imaging device 130 is installed and an infrared cut filter 110 is installed. In addition, an aperture 210 is installed inside the lens barrel 200A.

The infrared cut filter 110 in the camera main body 100A is driven by a filter driving actuator 230 such as a motor installed in the camera main body 100A and inserted into or removed from the optical path L in front of the photographing element 130. 8A shows a state in which the infrared cut filter 110 is inserted on the optical path L, and (b) shows a state in which the infrared cut filter 110 is removed on the optical path L, respectively. On the other hand, the diaphragm 210 in the lens barrel 200A is driven by an aperture driving actuator 220 such as a galvanometer provided in the lens barrel 200A, and adjusts the size of the aperture opening.

In the state of Fig. 8A, since the infrared cut filter 110 is inserted on the optical path L, the light incident on the lens barrel 200A enters the camera main body 100A through the aperture 210, and the infrared cut filter 110 The light passes through the image pickup device 130, and is projected onto the image pickup device 130 as a subject image. On the other hand, in the state of (b), since the infrared cut filter 110 is removed on the optical path L, the light incident on the lens barrel 200A is incident on the camera body 100A through the aperture 210, and the imaging device 130 does not pass through the infrared cut filter 110. Is reached directly and projected as an image on the subject.

9 (a) and 9 (b) are diagrams showing the structure of another conventional CCTV camera including the infrared cut filter in the lens barrel.

This CCTV camera is composed of a camera body 100B and a lens barrel 200B attached to the front, and the infrared cut filter 110 and the filter driving actuator 230 are not inside the camera body 100B, unlike the conventional example of FIG. It is installed inside the barrel 200B. The imaging device 130 and the aperture 210 are the same as the example of FIG.

In this CCTV camera, a dummy filter 111 is provided adjacent to the infrared cut filter 110. The dummy filter 111 is formed of a transmissive parallel flat plate having the same thickness as the infrared cut filter 110, and compensates for the difference in the optical path lengths when the infrared cut filter 110 is on or off the optical path L. This is to prevent the deviation of the focus on the photographing element 130 due to the difference in the optical path length.

Therefore, the infrared cut filter 110 and the dummy filter 111 are attached to the holder, which is not shown in the drawing, and either the infrared cut filter 110 or the dummy filter 111 is moved to the optical path L by driving the holder with the filter driving actuator 230. It is intended to be placed in.

In addition, since the conventional infrared cut filter is relatively thick (0.5 mm or more), in the CCTV camera described in Patent Document 1, when the diaphragm wing is disposed on one side of the diaphragm substrate (not shown in the drawing), By arranging the infrared cut filter on the other side of the diaphragm substrate, the diaphragm device is integrally provided with the infrared cut filter while avoiding the complicated structure of the stop.

Patent Document 1: Japanese Unexamined Patent Publication No. 2002-189238

In the conventional CCTV camera of FIG. 8, the infrared cut filter 110 is disposed inside the camera main body 100A. However, in recent CCTV cameras, since the camera main body 100A is gradually downsized, the infrared cut filter 110 and its driving mechanism (actuator 230). ) Is difficult to install in the camera body 100A.

As shown in Fig. 9, it is an effective countermeasure to install the infrared cut filter 110 together with the aperture 230 in the lens barrel 200 kHz. In particular, as described in Patent Document 1, the infrared cut filter and its driving mechanism have been integrally assembled to the diaphragm.

However, in the diaphragm device of the structure which integrated the conventional infrared cut-off filter described in patent document 1, since a relatively thick thing is used as an infrared cut-off filter, the operability of an aperture blade, an infrared cut-off filter, etc. When it considers, the structure which arrange | positions an infrared cut filter and a diaphragm blade on the front and back surface of an aperture board | substrate is inevitably employ | adopted, and for that reason, there was a limit in miniaturization of an aperture device. In addition, when focus correction is taken into account, a dummy filter for matching the optical path length must be used in addition to the infrared cut filter, which also has been an obstacle in miniaturization. In particular, when a dummy filter is used in addition to a thick infrared cut filter, the weight of the filter increases, so that the filter drive system is also enlarged, making it difficult to meet the demand of making the lens barrel smaller and lighter. It was.

In view of the above circumstances, the present invention can be made compact and lightweight while having an integrated optical filter freely inserted and removed on the optical path, whereby simply attaching it to the lens barrel of a CCTV camera, for example. It is an object of the present invention to provide a possible aperture device.

An aperture device according to claim 1 includes an aperture board having an opening for forming an optical path, an aperture blade for adjusting the optical path by being disposed on one plate surface of the aperture substrate and sliding along the plate surface, Aperture driving means for driving the diaphragm blade to adjust the optical path, an optical filter having a transmission characteristic according to the wavelength, and inserting the optical filter on or removed from the optical path Or a filter driving means for forming a thin film, and then attaching the optical filter unit integrally to a thin plate-shaped filter frame manufactured separately from the optical filter. The optical filter unit is configured as one of the diaphragm substrates. Also disposed on the side of the printing plate provided so as to slide along the diaphragm blades and the well characterized by installing driven by the filter drive means to the filter frame.

According to a second aspect of the invention, in the diaphragm according to claim 1, two pieces of the diaphragm blades are provided in a state of being stacked on each other, and the optical filter unit formed in the above thin plate shape is disposed between the two diaphragm blades. It is done.

According to a third aspect of the present invention, there is provided the diaphragm according to claim 1 or 2, wherein the optical filter is an infrared cut filter for blocking light in the infrared region, and is formed in a thin film shape having a thickness of 0.25 mm or less.

The invention of claim 4 is the diaphragm device according to any one of claims 1 to 3, wherein the optical filter is configured such that the driven portion of the filter frame is supported by an axis formed at an end of the aperture substrate and rotated. The optical filter unit is rotated about its axis to be inserted into or removed from the optical path.

The invention according to claim 5 is the aperture device according to claim 4, wherein the filter frame for attaching the optical filter is formed in a substantially disc shape and extends from the frame body having a transmission hole in the center thereof. It is provided with the said driven part to become,

The outer periphery of the edge main body is formed so that a protrusion for stabilizing the sliding operation of the optical filter unit along the aperture blades is protruded, and an optical filter using a jig from the outer periphery when attaching the optical filter. Positioning edge portion is formed to match the outer peripheral edge of the.

Invention of Claim 6 is an aperture device as described in any one of Claims 1-5, Comprising: The said filter edge is formed from the material provided with flexibility in the thickness direction.

The invention of claim 7 is the aperture device according to any one of claims 1 to 6, wherein both the aperture driving means and the filter driving means are arranged on the same side with respect to the optical path on the aperture substrate.

The invention according to claim 8 is the diaphragm device according to any one of claims 1 to 7, wherein the filter driving means includes a first position side of the optical filter unit rather than an intermediate position between the first position on the optical path and the second position deviated on the optical path. Filter support for supporting the optical filter unit at a second position by magnetic force when the optical filter unit is at the second position from the intermediate position when the optical filter unit is at A means is provided.

According to a ninth aspect of the present invention, there is provided the diaphragm device according to claim 8, wherein the filter support means includes a permanent magnet provided in a rotor of a motor for driving the optical filter unit, and the optical filter unit in the first position and the second position. When operating in the intermediate position, the permanent magnet is disposed at an equidistant position from the adjacent N poles and S poles of the permanent magnet, and generates suction force between the N poles or the S poles, thereby applying rotational pressure to the rotor. It is characterized by consisting of magnetic pieces.

According to a tenth aspect of the present invention, there is provided the diaphragm according to any one of claims 1 to 9, wherein an ND filter (neutral density filter) different from the optical filter is provided in a transmission hole that forms the aperture opening of the aperture blade. The ND filter is characterized in that the infrared ray transmittance has a spectral transmittance characteristic that is approximately equal to or lower than that of the visible region.

(Example)

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described based on drawing.

1 is an exploded perspective view showing the overall configuration of the aperture device of the embodiment, FIG. 2 is an exploded perspective view showing the overall configuration of the aperture device in a state where the optical filter is attached to the filter frame and unitized, and FIG. 3 is a configuration of the optical filter unit. It is also.

The diaphragm 1 is a pair of diaphragm blades assembled so as to slide in a state where the rectangular board-shaped diaphragm 10 made of a resin molded article and the upper surface (on one plate surface) of the diaphragm 10 are stacked on each other. 12, 13, and a thin plate-shaped optical filter unit 15 rotatably disposed between the two aperture blades 12 and 13, and the aperture blades 12, 13 and the optical filter unit 15 assembled on the upper surface of the aperture substrate 10. A wing cover 14 that can cover the iris blades 12 and 13 on the iris substrate 10, an iris drive (aperture drive means) 20 and a filter drive device (filter drive means) 30 are assembled on the lower surface side of the iris substrate 10. Is done.

Openings 10a and 14a are formed in the aperture substrate 10 and the wing cover 14 to form optical paths (paths of light having the central axis in the figure as the optical axis in the drawing), and cuts for forming aperture openings in the aperture wings 12 and 13. Penetrating hole portions 12e and 13e are formed. The above optical path can be adjusted by sliding the stop blades 12 and 13 in the direction of arrows f1 and f2 on the aperture substrate 10. The aperture drive device 20 slides the aperture blades 12 and 13 through the drive pins 21a and 21b formed on the drive lever, which is not shown in the drawing, and is configured around the motor.

The optical filter unit 15 forms an optical filter 152 having a transmission characteristic according to the wavelength in a thin film shape, and then attaches it integrally to a thin filter edge 151 formed separately from the optical filter 152 so that the whole is thin. It is comprised as an integral unit of a shape. As the optical filter 152, an infrared cut filter for blocking light in the infrared region (including the near infrared region) is used. The filter drive device 30 rotates the optical filter unit 15 through the drive lever 31 to insert the optical filter unit 15 onto the optical path or to remove the optical filter unit 15 from the optical path.

In detail, the optical filter unit 15 is an optical filter 152 formed in a thin film shape having a thickness of 0.25 mm or less, which is integrally attached to the thin filter edge 151 having a thickness of 0.12 mm or less by adhesion or the like as a whole. It is very thin, about 0.3mm thick. In this case, the optical filter 152 is formed of glass (glass), the filter edge 151 is formed of a plastic thin plate, and the filter edge 151 has flexibility in the thickness direction. Therefore, the filter rim 151 may act as a shock absorbing effect to protect the thin film-shaped optical filter 152 from impact. And the optical filter unit 15 is inserted in the small space | interval (gap) of two aperture blades 12 and 13, and is provided so that it can slide along aperture blades 12 and 13. Thus, the optical filter unit 15 can slide smoothly by making the surface of the aperture blades 12 and 13 into a guide surface by being sandwiched between two aperture blades 12 and 13, and it is a sheet-like and stable insertion and removal operation | movement. This is possible.

In addition, ND filters (neutral density filters) 12f and 13f which are different from the optical filter 15 which consist of an infrared cut-off filter are attached to the transmission hole parts 12e and 13e which form the aperture opening of aperture stop 12,13. These ND filters 12f and 13f are made to have a spectral transmittance characteristic in which the transmittance of light in the infrared region is approximately equal to or less than or equal to the transmittance of light in the visible region.

In the vicinity of the edge portion of the upper surface of the diaphragm 10, a plurality of four guide pins 11a, 11b, 11c, and 11d having tip hooks engaged with the diaphragm wings 12 and 13 are formed. Further, in the vicinity of the edge portions of the diaphragm wings 12 and 13, long grooves 12a, 12b, 12c, 13a, 13b, and 13c are formed in parallel with the respective edge portions. Then, the long grooves 12a, 12b, 12c, 13a, 13b, and 13c are inserted into the guide pins 11a, 11b, 11c, and 11d so that the aperture blades 12 and 13 are supported by the upper surface of the aperture substrate 10 and slide straight in the direction of arrows f1 and f2. It is supposed to. In addition, the tip hook portions of the guide pins 11a, 11b, 11c, and 11d prevent the stop blades 12 and 13 from falling upward. In Fig. 1, the diaphragm 10, which is provided on the diaphragm substrate 10, is a mounting bracket for attaching and fixing the diaphragm 1 to a lens barrel or the like (described later using Fig. 7).

As elements for driving the diaphragm wings 12 and 13, first, horizontal grooves 12d and 13d perpendicular to the slide directions of the diaphragm wings 12 and 13 are formed at end portions in the longitudinal direction of the diaphragm wings 12 and 13, respectively. . On the other hand, a stop lever not shown in the figure is provided in the stop drive device 20 attached to the lower surface side of the stop substrate 10. The drive lever has drive pins 21a and 21b protruding toward the upper surface side of the diaphragm substrate 10 at both ends thereof, and the center thereof is coupled to a motor shaft (not shown in the drawing) of the aperture drive device 20. Each of the driving pins 21a and 21b is coupled with the horizontal grooves 12d and 13d formed at the end portions in the longitudinal direction of the aperture blades 12 and 13, respectively. Accordingly, when the motor of the aperture driving device 20 is driven to rotate, the driving pins 21a and 21b By rotating, the two aperture blades 12 and 13 slide linearly to adjust the aperture of the optical path.

In the optical filter unit 15 disposed between the two aperture blades 12 and 13 that slide in a straight line in this manner, as shown in FIGS. 1 and 3, an optical filter 152 capable of blocking the optical path is used. It is formed in a circular shape slightly larger than the through holes 12e and 13e. As shown in detail in Fig. 3 (a), the filter rim 151 is formed in a substantially disk shape, and has a rim body 151a having a transmission hole 151h in the center thereof, and a crank lever portion extending in an L shape from the rim body 151a. (Drive section) 151b is provided. The penetrating hole 151h of the edge main body 151 is formed into a circular hole slightly larger than the penetrating hole portions 12e and 13e of the diaphragm wings 12 and 13. As shown in Fig. 3 (b), the circular optical filter 152 is superposed on the upper surface of the frame main body 151 so as to cover the transmission hole 151h, and in that state by the adhesive 153 as shown in Fig. 3 (c). It is fixed. In this case, the amount of protrusions is limited so that the adhesive agent 153 is accommodated within the range of the step between the optical filter 152 and the filter edge 151.

The outer periphery of the frame main body 151a of the filter frame 151 is formed so that protrusions 151f and 151g for stabilizing the movement of the optical filter unit 15 along the aperture blades 12 and 13 protrude, and when the optical filter 152 is attached, A positioning frame 151k is formed from the jig (not shown in the drawing: for example, a vertical pin) to coincide with the outer periphery of the optical filter 152. The positioning edges 151k are formed in at least three places at intervals in the circumferential direction.

Since the positioning edge portion 151k is formed in this manner, the optical filter 152 can be attached to the filter edge 151 while easily positioning with the jig. In addition, the edge main body 151a can be said to be advantageous in reducing the driving load of the optical filter unit 15 by forming the minimum size to which the optical filter 152 can be attached. In the case where there is a slight curvature at 13, the outer periphery of the annular frame main body 151a is easily caught by the edge of the penetrating hole 12e of the aperture blade 12 during the slide operation. In this regard, in the filter frame 151 of this embodiment, the projections 151f and 151g are formed on the outer rim of the frame body 151a to stabilize the slide operation.

That is, by forming the protrusions 151f and 151g where necessary while suppressing the size of the outline of the frame main body 151a to be small, the filter frame can be slid in a state where the protrusions 151f and 151g are always burned on the aperture blades 12. Accordingly, the jam can be prevented, so that the operation can be stabilized, and thus, even a slight deflection can be coped with.

The point will be described briefly with reference to the drawings. Fig. 4 shows the case of the present invention embodiment in which the protrusions 151f and 151g are on the filter edge 151, and Fig. 5 shows a comparative example without the protrusions, respectively.

The aperture hole 12e is formed in the diaphragm vane 12 in which the optical filter unit 15 slides the upper surface. However, the V-shaped cut portion 12ev is formed in the transmission hole 12e with the ND filter 12f attached thereto. Here, if the outline of the frame main body 151a of the filter frame 151 does not have a protruding portion as a circle as in the comparative example of Fig. 5, the filter frame 151 (optical filter) has a slight deflection in the aperture blade 12 or the filter frame 151. When the unit 15 is inserted into or removed from the optical path, particularly when inserted into the optical path, the outer edge of the filter frame 151 may be caught by the U-shaped cut portion 12ev of the transmission hole 12e of the aperture blade 12.

On the other hand, as in the present embodiment shown in Fig. 4, if there are protrusions 151f and 151g on the outer periphery of the frame main body 151 of the filter frame 151, there are many portions (overlapping portions) on which the filter frame 151 rides on the aperture blade 12. Since the burned part is guided, the hooking part can eliminate the jamming with the diaphragm 12 side when the filter rim 151 moves. In other words, the projections 151f and 151g can smoothly ensure the slide operation of the optical filter unit 15 without being caught even if there is a slight deflection in the aperture blade 12 or the filter edge 151. In addition, the same effect can be obtained also with respect to the aperture blade 13 side.

In addition, when the edge main body 151a is made as small as possible, it is difficult to secure the adhesive space when the optical filter 152 is fixed with the adhesive 153. However, since the protrusions 151f and 151g are provided, the space for the adhesive 153 can be secured thereon. Therefore, assembly property is also improved.

Next, a structure for sliding the optical filter unit 15 will be described.

As shown in Fig. 3 (a), the filter edge 151 is provided with an L-shaped crank lever portion (driven portion) 151b extending outward at one end thereof. The perforation hole 151c is formed in the bent part of the crank lever part 151b, and the long hole 151d is formed in the front end side of the crank lever part 151b. A long hole 151e is also formed in front of the through hole 151c.

One edge portion of the diaphragm substrate 10 is formed such that the bracket 10b for attaching the filter drive device 30 protrudes integrally, and the motor, which is a major element of the filter drive device 30, is not particularly attached to the lower surface side of the bracket 10b. ) Is attached. A support shaft 10c for supporting the optical filter unit 15 protrudes in the vicinity of the bracket 10a, and a drive pin 31a formed at the tip of the drive lever 31 of the filter drive device 30 protrudes in the vicinity of the support shaft 10c.

The optical filter unit 15 is rotatably supported along the surfaces of the diaphragm wings 12 and 13 around the support shaft 10c by inserting the transmission hole 151c formed in the bent portion of the crank lever portion 151b into the support shaft 10c. In addition, the driving pin 31a of the filter driving device 30 is coupled to the long hole 151d formed at the front end side of the crank lever part 151b. Accordingly, the optical filter unit 15 rotates the support shaft 10c by rotating the driving pin 31a by driving the filter driving device 30. It is rotated about the center so that the optical filter 152 is inserted into or removed from the optical path (the optical filter 152 is present or disappeared on the optical path).

In this case, both the aperture driving device 20 and the filter driving device 30 are disposed on the same side with respect to the optical path on the aperture substrate 10. That is, both the aperture drive device 20 and the filter drive device 30 are disposed on one end side in the longitudinal direction of the aperture board 10. Therefore, the other end side in which the drive apparatuses 20 and 30 are not provided is hold | maintained dimensionally thin plate-shaped object.

Next, the structure of the filter drive apparatus 30 which rotates the optical filter unit 15 and drives to insert or remove the optical filter 152 with respect to an optical path is demonstrated in detail.

The filter drive device 30 moves the optical filter unit 15 to either the first position on the optical path (the filter use position) or the second position off the optical path (the position without the filter) even when the power supply to the motor is stopped. A filter support function (filter support means) for positioning support is provided.

This filter support function means that when the optical filter unit 15 is located on the first position side of the first position on the optical path (the filter use position) and the second position off the optical path (the position without the filter), the optical filter unit 15 By pressing the filter unit 15 to the first position side by the magnetic force, the resultant is supported at the first position, and the optical filter unit 15 is moved to the second position by the magnetic force when the optical filter unit 15 is at the second position side than the intermediate position. It is a function of supporting in a 2nd position as a result by pressing to the side.

The function of supporting the optical filter unit 15 at either the first position or the second position (filter support function = filter support means) is provided in the rotor of the motor driving the optical filter unit 15 in the case of the present embodiment. A magnetic force is generated between the permanent magnet and the N pole or the S pole of the permanent magnet, thereby achieving (composing) a magnetic piece that imparts a rotational pressing force to the rotor.

This point will be described in detail with reference to FIG.

The motor constituting the filter drive device 30 includes a rotor 32 having a rotor shaft 33 and a coil bobbin disposed around the rotor 32 for rotationally driving the rotor 32, as shown in FIG. 35, a coil 36 wound around the coil bobbin 35, a cylindrical yoke (not shown) coupled to the coil bobbin 35 from the outside, and the like. Here, the stator is composed of the yoke, the coil bobbin 35 and the coil 36.

The rotor 32 is composed of a cylindrical permanent magnet in which both ends of the radial direction are polarized into the N pole and the S pole. The rotor shaft 33 is made of resin, and the proximal end of the drive lever 31 that engages with the optical filter unit 15 is coupled to the distal end that protrudes outward. In addition, a soft magnetic piece 37 is disposed between the rotor 32 and the inside of the stator yoke (not shown in the drawing). As shown in Fig. 6 (a), the soft magnetic piece 37 has an N pole of the rotor 32 when the drive lever 31 is operated so that the optical filter unit 15 reaches an intermediate position between the first position and the second position. It is disposed at a position substantially equidistant from the S pole and the S pole, and has a function of generating a suction force between the N pole or the S pole of the rotor 32, thereby applying a rotating pressing force to the rotor 32.

Fig. 6B shows the rotational position of the rotor 32 when the optical filter unit 15 reaches the second position (the position off the optical path) as a result of the rotation of the rotor 32 in the direction of the arrow (a). At this time, since the N pole of the rotor 32 approaches the soft magnetic material 37, a large magnetic attraction force is generated between the N pole and the soft magnetic material 37. Even if the energization of the motor is stopped by the magnetic attraction force, the rotor 32, That is, the optical filter unit 15 is supported at the second position.

Fig. 6C shows the rotational position of the rotor 32 when the optical filter unit 15 reaches the first position (position on the optical path) as a result of the rotation of the rotor 32 in the direction of the arrow (b). At this time, since the S pole of the rotor 32 approaches the soft magnetic material 37, a large magnetic attraction force is generated between the S pole and the soft magnetic material 37, and the rotor 32, i.e., stops energizing the motor by the magnetic attraction force. The optical filter unit 15 is supported at the first position.

Therefore, the optical filter unit 15 can be supported by the magnetic force of the permanent magnet at any one of the first position and the second position, and in that state, the electric power of the motor is not necessary, so that heat generated by energization can be eliminated. In addition, the life of the battery power can be extended. Particularly, in the diaphragm 1 of the present embodiment, the magnetic force (that is, the pressing force) used for positioning the optical filter unit 15 is obtained by using the permanent magnet of the rotor, so that the soft magnetic piece 37 is simply disposed at a predetermined position. Can be configured.

Next, assuming that this aperture device 1 is applied to a day and night surveillance CCTV camera, the operation thereof will be described.

In this aperture device 1, the drive pins 21a and 21b coupled to the aperture blades 12 and 13 are rotated by driving control of the aperture drive device 20, and the aperture blades 12 and 13 are linearly slid by the rotation to adjust the aperture of the optical path. Can be. In the position close to when the iris is closed to the maximum, the ND filters 12f and 13f attached to the penetrating holes 12e and 13e of the iris wings 12 and 13 are positioned on the optical path, so that the action of the ND filter is applied to the shooting light. appear.

On the other hand, in this diaphragm 1, the drive lever 31 rotates by driving the filter drive device 30, so that the optical filter unit 15 is rotated and rotated about the support axis 10c by the rotation to insert or remove the optical filter 152 on the optical path. can do.

In this case, since the optical filter 152 is an infrared cut-off filter, the infrared region of the photographing light can be blocked by positioning the optical filter 152 on the optical path. In addition, the ND filters 12f and 13f can reduce the amount of infrared rays transmitted during night photography to the same extent as the light in the visible region, thereby preventing excessive infrared rays from being photographed. As it does not become brighter, it is possible to obtain an image that is easy to see.

In this diaphragm apparatus 1 in which such an operation is obtained, the optical filter unit 152 is formed in a thin plate shape and disposed along the diaphragm wings 12 and 13 on one plate surface (upper surface) side of the diaphragm substrate 10 along the diaphragm wings 12 and 13. Since it is provided so that it may slide, the structure of the aperture device 1 can be simplified.

In particular, since the optical filter unit 15 is disposed in a small gap between the two aperture blades 12 and 13, extra space for the optical filter unit 15 is not necessary at all, so that the size of the aperture device 1 can be reduced in thickness. . In addition, since the optical filter unit 15 can be slid by the guides of two aperture blades 12 and 13, the operation of the optical filter unit 15 can be facilitated.

In addition, by forming the optical filter 152 into a thin film of 0.25 mm or less, the difference in the optical path length with or without the optical filter 152 can be almost eliminated, and the optical design in consideration of the deviation of the focus can be made unnecessary. That is, the dummy filter becomes unnecessary, and the drive system can also be included to achieve small size and light weight.

Therefore, while the optical filter 152 is integrally assembled so as to be freely inserted and removed from the optical path, the entire aperture device 1 can be miniaturized (especially thin), making it easy to assemble to the lens barrel and the like, and also having a light weight such as a lens barrel, It can contribute to miniaturization.

In addition, since the slide system of the optical filter unit 15 is rotated instead of linearly sliding like the aperture blades 12 and 13, the drive system of the optical filter unit 15 can be made simple and space-saving. It is possible to perform a design that is comfortable against interference with the driving system.

In particular, in the diaphragm device 1, the diaphragm drive device 20 and the filter drive device 30 are provided on the same side with respect to the optical path. Therefore, when the diaphragm device 1 is assembled to, for example, a lens barrel of a CCTV camera, which drive device 20 or 30 is used. Since the assembly is not hindered, it is possible to assemble the diaphragm 1 into the lens barrel without difficulty.

7 shows an example of attachment to the lens barrel 2 of the diaphragm 1.

A side hole 2a is formed in the circumferential wall of the lens barrel 2, and the aperture device 1 can be inserted into the side hole 2a from the direction perpendicular to the optical axis. An attachment seat 2b is provided at one end of the side hole 2a, and a screw hole 2c is formed in the front surface of the attachment seat 2b. On the other hand, the diaphragm 10 of the diaphragm 1 is provided with an attachment bracket 16 for fixing, and the attachment bracket 16 is provided with a cutting groove 16a for screws and a contact surface 16b with respect to the attachment seat 2b on the lens barrel 2 side. It is.

Since the diaphragm apparatus 1 arrange | positions both the diaphragm drive apparatus 20 and the filter drive apparatus 30 to one side with respect to an optical path, the opposite side to the side with the drive apparatus 20, 30 is kept in thin plate shape. Therefore, when the diaphragm 1 is assembled to the lens barrel 2, the thin side of the diaphragm 1 is inserted into the side hole 2a of the lens barrel 2, and the contact surface 16b of the attachment bracket 16 is placed on the front of the attachment seat 2a on the lens barrel 2 side. In this state, the diaphragm 1 can be attached to the lens barrel 2 by fastening the screw 17 to the screw hole 2b of the attachment seat 2a through the cutting groove 16a of the attachment bracket 16. Therefore, the assembly to the lens barrel 2 can be simplified and workability is good.

In addition, in this aperture device, the optical filter 152 is attached to the filter edge 151 produced separately from it, and therefore the optical filter 152 and the filter edge 151 can be comprised with a different material. In other words, the optical filter 152 can be produced by first selecting a material having excellent optical properties without any problems with respect to workability or mechanical properties, and the filter edge 151 has no problem with optical properties, and the crank as a driven part. From the relationship forming the lever portion 151b, it is possible to preferentially select and produce a material having only excellent mechanical properties and excellent workability.

For example, as in the present embodiment, the optical filter 152 is made of thin glass that is easy to cut circularly but difficult to process (such as machining of driven parts), and the filter frame 151 is made of thin plastic such as easy to process. Can be produced with

In addition, since the filter frame 151 and the optical filter 152 having the crank lever portion 151b may be separately attached and then integrally attached to each other, a thin film formation (for example, a deposition process) for imparting specific optical characteristics may be performed. Since only the optical filter 152 needs to be performed, there is no waste, and the conditions for forming the thin film may be selected based only on the material of the optical filter 152. For example, when the optical filter 152 is made of glass, the temperature condition can be set higher than that of the plastic.

As a result, the processing can be facilitated and the characteristics can be improved, and the cost can be reduced. In addition, since it is not necessary to apply the mechanical strength necessary for driving to the optical filter itself, the optical filter 152 can be formed as thin as possible, and it can contribute to the omission of the above-mentioned dummy filter from that point.

In the above embodiment, the vane cover 14 is attached to the upper surface of the diaphragm substrate 10 for the purpose of preventing falling off of the diaphragm wings 12 and 13, but the diaphragm wings 12 and 13 are guide pins on the diaphragm substrate 10 side. Since dropout is prevented by 11a-11d, it is not necessary to attach the wing cover 14 necessarily.

In the above embodiment, the case where the aperture is adjusted by two aperture blades 12 and 13 has been described. However, the present invention can also be applied when the aperture is adjusted by one aperture blade. In that case, the optical filter unit 15 may be disposed at, for example, a gap between the aperture blades and the aperture substrate.

In the above embodiment, the case where the optical filter 152 is glass has been described, but may be formed of plastic. Even in this case, since the optical filter 152 can be made of a material different from that of the filter frame 151, the above advantages can be utilized.

In the diaphragm apparatus of Claim 1, since the optical filter unit formed in thin plate shape is arrange | positioned with the diaphragm blade on one board surface side of a diaphragm board, and it slides along an diaphragm blade, the front and back surface of an diaphragm board is provided. Compared with the conventional example in which the diaphragm wing and the optical filter are arrange | positioned at both sides, respectively, the structure can be simplified. Moreover, since the whole optical filter unit is thin plate-shaped, an optical filter unit can be arrange | positioned in narrow spaces, such as the space | interval (gap) between aperture blade | wings and the space | interval (gap) of a diaphragm blade and a diaphragm substrate. In addition, it does not interfere with the operation of the diaphragm blade, thereby ensuring its own slide performance, it is possible to assemble the optical filter unit into the aperture device without difficulty.

Therefore, the diaphragm apparatus can be miniaturized while the optical filter is integrally assembled to be freely inserted and removed from the optical path. In addition, by forming the optical filter in a thin film form, the difference in the optical path length between and when the optical filter is on the optical path can be almost eliminated, so that a dummy filter for preventing the deviation of the focus can be made unnecessary. As a result, an increase in weight and space in assembling the optical filter can be eliminated as much as possible, so that the assemblability at the time of assembling the lens barrel and the like can be improved, and it can also contribute to the weight and size of the lens barrel and the like. .

In addition, according to the present invention, the optical filter is attached to a filter frame produced separately from the optical filter, so that the optical filter and the filter frame can be made of different materials. That is, the optical filter does not have a problem with workability and mechanical properties, but can select and manufacture a material having excellent optical properties preferentially, and the filter frame has no problem with optical properties, and forms a driven portion. From the above relationship, only materials having excellent mechanical properties and excellent workability can be preferentially selected and produced. For example, an optical filter can be manufactured from thin glass (glass) which is easy to cut circularly but difficult to process (processing of a driven part, etc.), and the filter frame can be made of thin plastic, etc., which is easy to process.

In addition, since the filter frame and the optical filter including the driven portion may be separately manufactured and then attached integrally, the thin film formation for imparting specific optical characteristics may be performed only on the optical filter. What is necessary is just to select conditions based only on the material of an optical filter. For example, when the optical filter is made of glass, the temperature condition can be set higher than that of the plastic filter. As a result, the processing can be facilitated and the characteristics can be improved, and the cost can be reduced. In addition, since the optical filter itself does not need to bear the mechanical strength required for driving, the optical filter can be formed as thin as possible, and from this point of view, it can contribute to the omission of the dummy filter.

According to the invention of claim 2, since the optical filter unit is disposed in the gap between two aperture blades, a special space for disposing the optical filter unit is unnecessary, so that the size can be reduced. In addition, since the optical filter unit can be slid by the guide of the two iris blades, the operation of the optical filter unit can be facilitated.

According to the invention of claim 3, since the thickness of the optical filter is 0.25 mm or less, the difference in the optical path length with or without the optical filter can be almost eliminated, and the optical design considering the deviation of the focus can be made unnecessary. That is, the dummy filter becomes unnecessary, and the drive system can also be included to achieve small size and light weight. In addition, since the optical filter is an infrared blocking filter that transmits light in the visible region and blocks light in the infrared (near infrared) region, the optical filter is preferably used as an aperture device for CCTV cameras. By taking the light in the infrared region, it is possible to shoot. In the daytime shooting, the optical filter can be inserted onto the optical path to block the light in the infrared region.

Although the method of sliding the optical filter unit along the aperture blade may be linear or rotational, the aperture system of claim 4 has a rotational rotation around an axis provided at the end of the aperture substrate, so that the drive system of the optical filter unit is spaced. A simple structure of economy type can be made. Moreover, by rotating, the optical filter unit can be driven without difficulty in a small space | interval between aperture blades.

According to the invention of claim 5, when the optical filter is attached to the outer circumference of the frame main body of the filter frame, a positioning frame for matching with the outer rim of the optical filter is provided by using the jig from the outer circumference, so that it is easily positioned as a jig. The optical filter can be attached to the filter rim while determining. In addition, it is advantageous to reduce the drive load of the optical filter unit to form the frame main body at the minimum size to which the optical filter can be attached. However, if the filter frame or the diaphragm wing seems to be slightly bent, At the time of the slide operation, the outer periphery of the annular frame body is easily caught by the periphery of the penetrating hole of the diaphragm wing. In this regard, in the present invention, a protrusion is formed on the outer periphery of the edge main body to stabilize the slide operation.

That is, by suppressing the size of the outline of the frame body to be small, the filter frame can be slid in a state where the protrusion is always burned on the iris blade by forming the protrusion at the required place. As a result, the jam can be prevented and the operation can be stabilized, so that a slight deflection can be coped with. In addition, when the edge main body is made as small as possible, it becomes difficult to secure the adhesive space when the optical filter is fixed with the adhesive. However, the above protruding portion ensures the space where the adhesive is placed thereon, and the assemblability is also improved. .

According to the invention of claim 6, since the filter edge is flexible in its thickness direction, it can act as a shock absorber and can be protected from impact even when a thin-film optical filter is made of glass, for example.

According to the invention of claim 7, since the diaphragm driving means and the filter driving means, which are relatively large parts, are provided on the same side with respect to the optical path, that is, the parts (aperture driving means and filter driving) having a large dimension in the thickness direction of the diaphragm substrate. Instead of being disposed on both sides with the optical path interposed therebetween, the part on the opposite side can be made thinner. Therefore, in the case of assembling the diaphragm to the lens barrel, the diaphragm can be easily assembled to the lens barrel by first inserting the thinly maintained portion from the side to the lens barrel without disturbing any of the driving means. Installation on the back can be made simple.

According to the invention of claim 8, since the position of the optical filter is supported by the magnetic force in either the first position or the second position, the filter drive means at the point of time when the operation of inserting or removing the optical filter is transmitted to the optical filter. Power supply to the filter can be stopped to reduce the power consumption of the filter driving means.

According to the invention of claim 9, since the magnetic force is obtained by using the permanent magnet of the rotor of the motor constituting the filter driving means, the waste of the configuration can be eliminated as much as possible and the configuration can be made at low cost.

According to the invention of claim 10, it is possible to reduce the amount of infrared rays transmitted during the night shooting when applied to, for example, a CCTV camera by the ND filter to the same extent as the light in the visible region, thereby preventing excessive infrared shooting. can do. Therefore, since the part of the subject with strong infrared rays does not appear to be too bright, an easy-to-view shot image can be obtained.

Claims (10)

An aperture board having an opening forming an optical path, An aperture blade which is disposed on one plate surface of the aperture substrate and adjusts the optical path by sliding along the plate surface; An aperture driving means for driving the aperture blades to adjust the optical path; An optical filter having a transmission characteristic according to a wavelength, Filter driving means for inserting or removing the optical filter on or in the optical path ; A filter edge having a driven portion coupled with the filter driving means; Respectively, After the optical filter is formed into a thin film shape, the whole is formed as a thin optical filter unit by integrally attaching to the thin plate-shaped filter frame manufactured separately from the optical filter. The optical filter unit is disposed on one plate surface side of the diaphragm substrate so as to slide along the diaphragm blade. The driven part of the filter rim is supported and rotated by an axis formed at the end of the aperture substrate, so that the optical filter unit is rotated by driving the filter driving means about the axis so that the optical filter is inserted into the optical path. The aperture device characterized in that it is removed on the optical path . The method according to claim 1, The two diaphragm blades are arrange | positioned in the state laminated | stacked on each other, The diaphragm apparatus characterized by arrange | positioning the optical filter unit formed in the said thin plate shape between these two aperture blades. The method according to claim 1 or 2, The optical filter is an infrared cut filter for blocking the light in the infrared region, the aperture device, characterized in that formed in a thin film shape of 0.25mm or less. delete The method according to claim 1, The filter frame for attaching the optical filter includes a frame body which is formed in a disk shape and has a transmission hole in the center thereof, and the driven portion extending from the frame body, The outer periphery of the edge main body is formed so that a protrusion for stabilizing the sliding operation of the optical filter unit along the aperture blades is protruded, and an optical filter using a jig from the outer periphery when attaching the optical filter. An aperture device, characterized in that the positioning edge portion is formed to match the outer peripheral edge of the. The method according to any one of claims 1, 2 or 5 , The filter device is formed of a material having flexibility in its thickness direction. The method according to any one of claims 1, 2 or 5 , And both the aperture driving means and the filter driving means are disposed on the same side with respect to the optical path on the aperture substrate. The method according to any one of claims 1, 2 or 5 , The filter driving means, The optical filter unit is supported at the first position by magnetic force when the optical filter unit is on the first position side of the intermediate position between the first position on the optical path and the second position deviated from the optical path, and the optical filter unit is Filter support means for supporting the optical filter unit at a second position by a magnetic force when it is at the second position side than the intermediate position. An aperture device, characterized in that provided. The method of claim 8, The filter support means, Permanent magnets installed in the rotor of the motor for driving the optical filter unit; When the optical filter unit is operated at an intermediate position between the first position and the second position, the permanent magnet is disposed at an equidistant position from the N poles and the S poles adjacent to each other, and between the N pole or the S pole. A magnetic piece that generates suction and thereby imparts rotational pressure to the rotor An aperture device, characterized in that made. The method according to any one of claims 1, 2, 5 or 9, An ND filter (neutral density filter) different from the optical filter is provided in the transmission hole forming the aperture opening of the aperture blade. The ND filter has a spectral transmittance characteristic in which the transmittance in the infrared region is equal to or less than or equal to the transmittance in the visible region.

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