TW201533522A - Filter switching device, diaphragm device and camera - Google Patents

Abstract

Provided herein is a technique for further miniaturization of a filter switching device. The filter switching device 6 of this invention comprises: a first filter unit 51 and a second filter unit 52 respectively provided with optical filters (54, 61) capable of being arranged on the incident optical path; and a filter switching mechanism 53 which, by exchanging the position of the first filter unit 51 and the second filter unit 52, enables rotary movement of the first filter unit 51 and the second filter unit 52 in opposite directions. The filter switching mechanism 53 is equipped with a gear transmission mechanism 68 for transmitting the drive force of a filter driving part to the first filter unit 51 and the second filter unit 52. The gear transmission mechanism 68 is composed of four gears (59, 65, 78, 86).

Description

Filter switching device, aperture device and camera

The present invention relates to a filter switching device for switching an optical filter, and an aperture device and a camera including the same.

An aperture device that adjusts the amount of light incident from the outside (hereinafter also referred to as "incident light amount") is incorporated in various cameras including a surveillance camera. The aperture device adjusts (corrects) the amount of incident light by changing the size of the aperture opening existing in the light path of the incident light. As the structure of the aperture device, there is a person who adjusts the amount of light by the movement of the diaphragm member. Specifically, a pair of aperture blades are used as the diaphragm member (for example, refer to Patent Document 1).

In addition, a photographic element capable of color photography is incorporated in a surveillance camera that is used both day and night. In such a surveillance camera, the shooting mode is switched when the subject is bright and the subject is dim. Specifically, the color photography mode is used for photographing during the day when the subject is bright, and the photographing mode is switched by using the monochrome photographing mode when photographing the subject at night or the like.

In the above-mentioned surveillance camera, there is a function of switching the optical filter in accordance with the switching function of the photographing mode (see, for example, Patent Documents 1 and 2). Specifically, in the color photography mode, the infrared ray blocking filter (ICF filter) is used for shooting. In the monochrome photography mode, the infrared ray blocking filter is not used, or other optical filters are penetrated. The mirror is taken. Therefore, when photographing is performed in the color photographing mode, light incident from the outside reaches the photographing element via the infrared ray blocking filter. In the case of shooting in the monochrome shooting mode, light incident from the outside does not pass through the infrared blocking filter or penetrates the other optical filter to reach the photographic element.

In the filter switching device used in a surveillance camera or the like, the optical filter is switched by changing the arrangement of the optical filter. For example, Patent Document 1 discloses a configuration in which two optical filters are arranged adjacent to each other on a common filter supporting member, and the filter supporting members are arranged in the direction of the optical filters. Move and switch the optical filter. Further, in the aforementioned Patent Document 2, there is disclosed a configuration in which an optical filter is supported by a filter supporting member, and the optical filter is switched by moving the filter supporting member.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2003-348398

Patent Document 2: Japanese Patent Laid-Open Publication No. 2007-17594

In recent years, with the development of surveillance cameras, the demand for high resolution has become higher and higher. In order to achieve high resolution of the surveillance camera, it is necessary to increase the number of pixels of the imaging element used in the surveillance camera. However, if only the number of pixels of the photographic element is simply increased, the size of the photographic element will increase. Further, if the pixel size of each pixel is reduced, there is no increase in the size of the pixel element, but in this case, it is susceptible to noise. Therefore, in order to suppress the influence of noise, it is possible to realize the surveillance camera. High resolution requires the use of larger photographic elements than the photographic elements used in the current stage. In this case, it is necessary to ensure the maximum diameter of the aperture opening in the aperture device mounted on the surveillance camera in accordance with the size of the photographic element.

However, as a filter switching device having two optical filters, for example, the configuration described in the above Patent Document 1 has the following disadvantages in that the high resolution of the surveillance camera is sought.

In other words, in the filter switching device described in Patent Document 1, two optical filters are arranged adjacent to each other on a common filter supporting member, and the filter supporting members are arranged in the optical filters. The mechanism that moves in the direction. Therefore, when the first optical filter is disposed in the aperture opening of the aperture device, it is necessary to dispose (retract) the second optical filter in advance from the position at which the aperture opening is biased to one side. Further, when the second optical filter is disposed in the aperture opening, it is necessary to dispose (retract) the first optical filter in advance from the position at which the aperture opening is biased to the other side. Therefore, as a space for movement necessary for switching the optical filter (hereinafter referred to as "space for filter switching"), it is necessary to secure a space in which only three optical filters are arranged and arranged. Thereby, the aperture device becomes larger. In particular, in order to achieve high resolution of the surveillance camera while suppressing the influence of the above-mentioned noise, if the maximum diameter of the aperture opening is largely ensured, the size of the optical filter is increased, and the space for filter switching is gradually increased. The enlargement has made the enlargement of the aperture device remarkable.

Therefore, the present inventors have proposed a brand-new filter switching device which can reduce the space for filter switching (Japanese Patent Application No. 2012-220064). In the filter switching device, a mechanism is used to switch the optical filters disposed on the incident light path by moving the two filter units by exchanging the positions of the two filter units. Further, in the filter switching device, a configuration is adopted in which two filter units are moved in opposite directions using a gear transmission mechanism including three intermediate gears.

However, it has recently been requested to make the filter switching device smaller. The present invention has been completed in response to such a request.

A first aspect of the present invention is a filter switching device, comprising: a first filter unit and a second filter unit, each having an optical filter, the optical filter being capable of being disposed at an incident light And a filter switching mechanism that rotatably supports the first filter unit and the second filter unit, and before the rotational movement, the first filter unit and the first The first filter unit and the second filter unit are rotationally moved in opposite directions by switching the positions of the two filter units, thereby switching the optical filter disposed on the incident light path. The filter switching mechanism includes a filter driving unit that generates a driving force for rotationally moving the first filter unit and the second filter unit, and transmits a driving force of the filter driving unit to a gear transmission mechanism of the first filter unit and the second filter unit, wherein the gear transmission mechanism includes a drive gear driven by the filter drive unit a first gear provided in the first filter unit, a second gear disposed in the second filter unit, and an intermediate gear, wherein the first gear train directly meshes with the drive gear, and the second gear train Engagement with the above-described drive gear via the intermediate gear described above.

A second aspect of the present invention is the filter switching device according to the first aspect, wherein the first gear and the intermediate gear are offset from a position in a tooth width direction of the drive gear, and the drive gear is generated. Engage, The drive gear and the second gear are offset in a tooth width direction of the intermediate gear to mesh with the intermediate gear.

A third aspect of the present invention is an aperture device comprising: the filter switching device described in the first or second aspect; and a diaphragm member that forms an aperture opening through which the incident light passes .

A fourth aspect of the invention is a camera comprising: the aperture device described in the third aspect.

According to the present invention, it is possible to further reduce the size of the filter switching device.

1‧‧‧ aperture device

2‧‧‧ aperture substrate

3, 4‧‧‧ aperture blades

5‧‧‧Aperture Drive Department

6‧‧‧Filter switching device

7‧‧‧ partition board

8‧‧‧ Cover member

10‧‧‧Connected holes

11‧‧‧ openings

12a, 12b, 12c, 12d‧‧ ‧ sales

14, 15‧‧‧Support shaft

16‧‧‧ claws

21‧‧‧Bend

22a, 22b, 22c‧‧‧ guiding slots

23‧‧‧Snap hole

24‧‧‧ Hole Department

25a, 25b, 25c‧‧‧ guiding slots

26‧‧‧Snap hole

27‧‧‧actuating components

28, 29, 30‧‧‧ reduction gears

28a‧‧‧Axis hole

29a‧‧‧Axis hole

30a‧‧‧Axis hole

31‧‧‧First member

32‧‧‧Second building

33‧‧‧Drive motor

34, 35‧‧‧ card sales

36a, 36b‧‧‧out hole

37‧‧‧ drive gear

38‧‧‧ drive gear

39‧‧‧Axis hole

40‧‧‧ Housing Department

41, 42, 43‧‧‧ support shaft

44‧‧‧ bracket

45‧‧‧Terminal Department

46‧‧‧Printed circuit board

47‧‧‧Wiring

50‧‧‧Filter switching mechanism

51‧‧‧First filter unit

52‧‧‧Second filter unit

53‧‧‧Filter switching mechanism

54‧‧‧Optical filter

55‧‧‧Filter support member

56‧‧‧ openings

57‧‧‧Filter support frame

58‧‧‧ base

59‧‧‧ Gear section (1st gear)

60‧‧‧ shaft hole

61‧‧‧Optical filter

62‧‧‧Filter support member

63‧‧‧Filter support frame

64‧‧‧ base

65‧‧‧ Gear section (2nd gear)

66‧‧‧Axis hole

67‧‧‧Filter Drive Department

68‧‧‧Gear transmission mechanism

71‧‧‧Rotating components

72‧‧‧ magnet

73‧‧‧winding shaft

74‧‧‧Support members

75‧‧‧ yoke

76‧‧‧ Magnet Holder

77‧‧‧arms

78‧‧‧ Gear section (drive gear)

79a, 79b‧‧‧ axis

80‧‧‧ terminals

81, 82‧‧‧ support piece

83‧‧‧ hole

84‧‧‧Relay substrate

85‧‧‧ wiring

86‧‧‧Intermediate gear

86a‧‧‧Axis hole

91‧‧‧ openings

92a, 92b, 92c, 92d‧‧‧ through holes

94‧‧‧ openings

95a, 95b, 95c, 95d‧‧‧through holes

96a, 96b, 97‧‧‧ detached holes

98‧‧‧Installation

100‧‧‧ camera

101‧‧‧Installation table

102‧‧‧ camera body

103‧‧‧Mirror tube

104‧‧‧object lens

105‧‧‧Photographic components

G1, G2‧‧‧

1(A) and (B) are diagrams showing a configuration example of a camera to which the present invention is applied.

Fig. 2 is an exploded perspective view of the aperture device according to the embodiment of the present invention as seen obliquely from below.

Fig. 3 is an exploded perspective view showing a configuration example of a diaphragm driving unit.

Fig. 4 is an exploded perspective view showing the configuration of the filter driving unit.

Fig. 5 is a perspective view showing the arrangement of the gears of the gear transmission mechanism.

Fig. 6 is a view showing the relative positional relationship of the height directions of the gears of the gear transmission mechanism.

Fig. 7 is a perspective view showing a first configuration state of the filter switching device.

Figure 8 is a perspective view showing the positional relationship of the respective portions of the first configuration state.

Figure 9 is a view of the arrow E of Figure 8.

Fig. 10 is a perspective view showing a second configuration state of the filter switching device.

Figure 11 is a perspective view showing the positional relationship of the respective portions of the second configuration state.

Figure 12 is a view of the arrow F of Figure 11;

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

<Composition of camera>

First, the configuration of the camera will be described.

Fig. 1 shows an example of a configuration of a camera to which the present invention is applied. (A) is an external view of the entire camera, and (B) is a schematic view of the inside of the lens barrel. The illustrated camera 100 is, for example, a surveillance camera that is placed on a ceiling portion (or a wall, a column, etc.) of a building for the purpose of preventing theft. This camera 100 includes a mounting table 101 and a camera body 102. The mounting table 101 is, for example, a structure that is fixed to a ceiling portion of a building by bolt locking.

The camera body 102 includes a barrel portion 103 and a counter lens 104. An optical system including the objective lens 104 is incorporated in the inside of the barrel portion 103. The objective lens 104 is attached to the front end of the barrel portion 103. Further, an aperture device 1 as a functional portion of the optical system and an imaging element 105 are incorporated in the camera body 102. The diaphragm device 1 forms a diaphragm opening in the middle of a traveling path (hereinafter referred to as "incident light path") of light incident on the barrel portion 103 (hereinafter referred to as "incident light"), and adjusts the aperture opening by adjusting the aperture opening The size, the amount of incident light is adjusted.

The imaging element 105 is an imaging element that can perform color photography, and is configured by, for example, a CCD (Charge Coupled Device) imaging element, a CMOS (Complementary Metal Oxide Semiconductor) imaging element, or the like. The imaging element 105 has, for example, a photographic surface in which a plurality of (majority) pixels are arranged in a matrix. The photographic element 105 is configured to switch incident light incident on the imaging surface by the aperture opening of the aperture device 1 into an electrical signal. One of the photoelectric switching elements is incorporated.

Further, the present invention is not limited to the camera 100 exemplified herein, and can be used for a camera having another configuration of the diaphragm device 1. Further, as a configuration of the optical system, various changes such as the type of the lens, the number of sheets, the arrangement, and the arrangement of the diaphragm device 1 can be performed.

<Composition of aperture device>

Next, the configuration of the aperture device will be described.

Fig. 2 is an exploded perspective view of the aperture device according to the embodiment of the present invention as seen obliquely from below. Here, in the thickness direction of the aperture device, the side on which the diaphragm driving portion to be described later is attached is referred to as the upper surface side (upper side), and the side on which the diaphragm blade is attached is referred to as the lower surface side (lower side).

The aperture device 1 shown in the drawing is configured to include a diaphragm substrate 2, a pair of (two) aperture blades 3 and 4, a diaphragm drive unit 5, a filter switching device 6, a partition plate 7, and a cover member 8.

<Aperture substrate>

The aperture substrate 2 serves as a member for mounting a base that constitutes a member of the aperture device 1. The pair of aperture blades 3 and 4 are provided as an example of a diaphragm member that forms an aperture opening through which incident light passes. The pair of diaphragm blades 3, 4 are formed to form a diaphragm opening in a state of being overlapped with each other. If the size of the aperture opening is relatively large, the amount of light passing through the opening (the amount of incident light) relatively increases, and if the size of the aperture opening is relatively small, the amount of light passing through the opening relatively decreases. The filter switching device 6 switches between optical filters disposed in an incident light path through which incident light passes. The diaphragm driving unit 5 moves the pair of diaphragm blades 3 and 4 relative to each other in order to adjust the size of the diaphragm opening. Hereinafter, the configuration of each part will be described in detail.

The diaphragm substrate 2 is made of, for example, a resin. The side on which the pair of diaphragm blades 3 and 4 are attached in the thickness direction of the diaphragm substrate 2 serves as the lower surface side of the diaphragm substrate 2. A communication hole 10 and an opening 11 through which incident light passes are formed in the aperture substrate 2. The opening 11 is formed in a circular shape in a state of passing through the thickness direction of the diaphragm substrate 2. Further, four pins 12a, 12b, 12c, and 12d and two support shafts 14, 15 are provided on the lower surface side of the diaphragm substrate 2. The four pins 12a, 12b, 12c, and 12d are for the aperture blades 3, 4, and The spacer 7 and the cover member 8 are attached to the diaphragm substrate 2 and used. The support shafts 14 and 15 are used to attach the constituent members (described later) of the filter switching device 6 to the diaphragm substrate 2. Further, claw portions 16, ... are provided on the outer peripheral portion of the diaphragm substrate 2 at four locations. The claw portions 16 are used to attach the cover member 8 to the diaphragm substrate 2.

(aperture blade)

The pair of diaphragm blades 3 and 4 are made of, for example, a material that is coated with a surface of a plate-like material containing polyethylene terephthalate with a carbon film to make it electrically conductive. Each of the aperture blades 3, 4 is formed in a thin plate shape as a whole.

One of the aperture blades 3 is provided with a bent portion 21, three guiding grooves 22a, 22b, 22c, and an engaging hole 23. The bent portion 21 is integrally bent to be formed in a substantially U shape, and a portion is cut into a V shape. An ND (Neutral Density) filter (not shown) is attached to a portion (a V-shaped cut portion) of the bent portion 21. The three guide grooves 22a, 22b, and 22c are formed in parallel with each other along the longitudinal direction of the diaphragm blades 3. The two guide grooves 22a and 22b of the three guide grooves 22a, 22b, and 22c are formed on the same straight line. Further, the remaining one of the guide grooves 22c is formed at an edge portion opposite to the curved portion 21 with respect to the two guide grooves 22a and 22b. The engagement holes 23 are formed on the extension lines of the two guide grooves 22a and 22b. Further, the engaging hole 23 is formed to be long in plan view in the short side direction of the diaphragm blade 3 Hole shape.

The other aperture coil 4 is provided with a hole portion 24, three guide grooves 25a, 25b, 25c, and an engagement hole 26. The hole portion 24 is integrally formed in a circular shape approximate to a perfect circle, and a part thereof is cut into a V shape. An ND filter (not shown) is attached to a portion (the cut portion of the V shape) of the hole portion 24. The hole portion 24 is formed by overlapping the aforementioned curved portion 21 to form a diaphragm opening. The three guide grooves 25a, 25b, and 25c are formed in parallel with each other along the longitudinal direction of the diaphragm blades 4. The two guide grooves 25a and 25b of the three guide grooves 25a, 25b, and 25c are formed on the same straight line. Further, the remaining one of the guide grooves 25c is formed at an edge portion opposite to the hole portion 24 with respect to the two guide grooves 25a and 25b. The engagement holes 26 are formed on the extension lines of the two guide grooves 25a and 25b. Further, the engaging hole 26 is formed in a long hole shape in plan view in the short side direction of the diaphragm blade 4.

(aperture drive unit)

The diaphragm driving unit 5 is configured to move the respective diaphragm blades 3 and 4 in opposite directions when the size of the diaphragm opening formed by the two diaphragm blades 3 and 4 is adjusted. As shown in FIG. 3, the diaphragm driving unit 5 is configured by using the operating member 27, the three reduction gears 28, 29, and 30, the first seat member 31, the second seat member 32, and the drive motor 33.

(actuating member)

The actuating member 27 is motivated to move the pair of diaphragm blades 3, 4 in opposite directions. The actuating member 27 is formed, for example, by molding a resin body. A pair of engaging pins 34 and 35 (FIG. 2), a pair of disengaging holes 36a and 36b, a drive gear 38, and a shaft hole 39 are integrally formed in the actuating member 27. A shaft hole 28a is provided at the center of the reduction gear 28. Similarly, a shaft hole 29a is provided in the reduction gear 29, and a shaft hole 30a is provided in the reduction gear 30. Each of the three reduction gears 28, 29, and 30 has two gear portions of two sizes arranged in the upper and lower stages. Further, the small-diameter gear portion (not shown) of the reduction gear 28 meshes with the drive gear 38, and the large-diameter gear portion of the reduction gear 28 meshes with the small-diameter gear portion (not shown) of the reduction gear 29. Further, the large-diameter gear portion of the reduction gear 29 meshes with the small-diameter gear portion of the reduction gear 30, and the large-diameter gear portion of the reduction gear 30 meshes with the drive gear 37. The drive gear 37 is attached to the rotating shaft of the drive motor 33. The drive motor 33 is constituted by, for example, a stepping motor.

The first member 31 and the second member 32 are attached to the housing portion 40 of the diaphragm substrate 2 . The accommodating portion 40 of the diaphragm substrate 2 is formed in a box shape, and three support shafts 41, 42, 43 are provided in the casing. The first member 31 is detachably attached to the accommodating portion 40 of the diaphragm substrate 2. The second seat member 32 is detachably attachable to the first seat member 31. The drive motor 33 is attached to the second seat member 32 using the bracket 44. Further, a printed circuit board 46 is mounted on the terminal portion 45 of the drive motor 33 by soldering. Further, a wiring 47 to which a terminal is attached is attached to the printed circuit board 46 by soldering.

Further, the configuration of the diaphragm driving unit 5 is basically similar to that described in Japanese Laid-Open Patent Publication No. 2013-109253.

(Composition of filter switching device)

The filter switching device 6 includes: a first filter unit 51 and a second filter unit 52, each having an optical filter configurable in an incident light path through which incident light passes; and a filter switching mechanism 53 for The first filter unit 51 and the second filter unit 52 are rotatably supported, and the positions of the first filter unit 51 and the second filter unit 52 are exchanged before the rotational movement, by making the first The filter unit 51 and the second filter unit 52 face each other The rotation is moved in the opposite direction, and the optical filter disposed on the path of the incident light is switched.

(filter unit)

The first filter unit 51 and the second filter unit 52 basically have a similar configuration. Therefore, the configuration of the first filter unit 51 will be described in detail herein.

The first filter unit 51 is configured by using an optical filter 54 and a filter supporting member 55 that supports the optical filter 54. The optical filter 54 is formed, for example, on a square (a square in the illustrated example) glass substrate. In view of the labor involved in obtaining a plurality of optical filters 54 from a large-sized glass substrate which is a mother board of the optical filter 54, it is preferable that the shape of the optical filter 54 is a rectangle. However, the shape of the optical filter 54 is not limited thereto, and for example, it may be a circle or a polygon other than a square.

The filter supporting member 55 is obtained by, for example, molding a resin. A circular opening portion 56 is formed in the filter supporting member 55 in a state of penetrating the filter supporting member 55. This opening portion 56 is for a person who passes the incident light as a target of the filter ring. Therefore, the optical filter 54 is attached in a state in which the opening 56 is closed. The optical filter 54 is fixed to one side of the filter support member 55 using, for example, an adhesive.

A filter support frame 57, a base portion 58, and a gear portion 59 are integrally formed on the filter support member 55. A step (depression) is provided on one side of the filter support frame 57 so as to surround the opening 56, and an optical filter 54 is attached to a portion of the step. The optical filter 54 is housed in the step of the filter support frame 57 so as not to protrude in the thickness direction of the filter support frame 57. Further, the base portion 58 of the filter supporting member 55 is formed in a sector shape, and a gear portion 59 is formed in a circular arc portion of the sector. From the filter support frame 57 to the base portion 58, all but the above-described step portions are formed equally flat. On the other hand, the base portion 58 and the gear portion 59 are formed such that the gear portion 59 protrudes in the thickness direction of the filter supporting member 55. With a stage structure. The teeth of the gear portion 59 are disposed in a state in which the arc portion of the sector forming the base portion 58 protrudes beyond the outer side. A shaft hole 60 as a fulcrum when the filter unit 51 is rotationally moved is formed in the base portion 58. The arc portion of the base portion 58 and the pitch of the teeth of the gear portion 59 are centered on the shaft hole 60, respectively.

Similarly, the second filter unit 52 is configured using an optical filter 61 and a filter supporting member 62 that supports the optical filter 61. Further, a filter support frame 63, a base portion 64, and a gear portion 65 are integrally formed on the filter supporting member 62. Further, a shaft hole 66 is formed in the base portion 64 of the filter supporting member 62.

The two filter units 51 and 52 are attached to the diaphragm substrate 2 in a state in which the filter mounting surfaces are opposed to each other. At this time, the gear portion 59 of the filter supporting member 55 and the gear portion 65 of the filter supporting member 62 are disposed to face outward, respectively. In other words, the gear portion 59 is disposed to protrude from the cover member 8 side, and the gear portion 65 is disposed to protrude from the partition plate 7 side.

The combination of the optical filters 54 and 61 used in the above two filter units 51 and 52 can be considered as various combinations. As an example, an infrared filter is used to form an optical filter 54 and is configured by a dummy filter. The mirror constitutes another optical filter 61. The infrared blocking filter is a filter that blocks infrared rays from incident light. The dummy filter is a filter (light path length correction filter) used to correct the optical path length. Specifically, the dummy filter is an optical path length when the optical filter (in this embodiment, an infrared ray blocking filter) used in combination is disposed in the incident light path, and the dummy filter is disposed on the incident light path. When the length of the light path is equal to the length, the length of the optical path is corrected.

(filter switching mechanism)

The filter switching mechanism 53 is configured to include a filter driving unit 67 (FIG. 4) that generates a driving force for rotationally moving the first filter unit 51 and the second filter unit 52; The gear transmission mechanism 68 (FIGS. 2 and 5) transmits the driving force of the filter driving unit 67 to the first filter unit 51 and the second filter unit 52.

(filter drive unit)

As shown in FIG. 4, the filter driving unit 67 is configured by using a rotating member 71, a magnet 72, a bobbin 73, a coil (not shown), a support member 74, and a yoke 75. A magnet holder portion 76, an arm portion 77, and a gear portion 78 are integrally formed on the rotating member 71. The magnet holder portion 76 holds a portion of the magnet 72. On the upper and lower surfaces of the magnet holder portion 76, shafts 79a and 79b (Fig. 5) are provided coaxially. The equal shafts 79a and 79b are the rotation centers of the rotating member 71. The arm portion 77 extends in an L shape from the lower end of the magnet holder portion 76, and a gear portion 78 is formed at the extended end thereof. The gear portion 78 is formed in an arc shape. The arm portion 77 is connected to the intermediate portion of the arc of the gear portion 78.

The magnet 72 is constructed using a square permanent magnet. The reason why a square permanent magnet is used as the magnet 72 is advantageous in terms of cost and ease of processing as compared with the use of a cylindrical permanent magnet. However, in the practice of the present invention, the shape of the permanent magnet is not limited to a specific shape. The magnet 72 is assembled to the magnet holder portion 76 in a fixed state. In this assembled state, the virtual axes connecting the upper and lower shafts 79a, 79b are arranged to pass through the center of the magnet 72.

The bobbin 73 is mainly formed of an insulating material such as resin. Four terminals 80, ... are provided at the upper end of the bobbin 73. A terminal of the winding of the coil is connected to the terminal 80. The coil is wound around the bobbin 73 so as to surround the magnet holder portion 76 of the holding magnet 72. The support member 74 has two support pieces 81 and 82, and is attached to the bobbin 73 so as to hold the upper portion of the coil by the support pieces 81 and 82. The support piece 82 of the support member 74 is provided with a hole (not shown), and corresponding to this, also at the bottom of the bobbin 73 A hole 83 is also provided in the portion. A shaft 79a of the magnet holder portion 76 is inserted into the hole of the support piece 82, and a shaft 79b of the magnet holder portion 76 is inserted into the hole 83 of the bobbin 73. Thereby, the rotating member 71 is rotatably supported by the bobbin 73 and the support member 74.

The yoke 75 is a system that suppresses leakage of magnetic lines of force toward the outside. The yoke 75 is formed in a cylindrical shape. The yoke 75 accommodates a bobbin assembly including the rotating member 71, the magnet 72, the bobbin 73, the coil, the support member 74, and the like. However, in a state in which the bobbin assembly is housed in the yoke 75, the arm portion 77 and the gear portion 78 of the rotating member 71 are disposed to protrude from the yoke 75.

A relay substrate 84 is attached to the upper end of the yoke 75. The relay substrate 84 is composed of a circular printed circuit board corresponding to the diameter of the yoke 75. The four terminals 80 and the wiring 85 with a connector are soldered to the relay substrate 84, respectively. The relay substrate 84 is electrically connected to a coil wound around the bobbin 73 and a filter control unit (not shown). The filter control unit causes a current to flow to the coil based on predetermined conditions. If current flows in the coil, a magnetic force is generated. This magnetic force serves as a driving force for rotationally moving the two filter units 51 and 52. Further, when a magnetic force is generated by energizing the coil, the rotating member 71 performs a rotating operation by the action of the magnetic force. At this time, the direction in which the rotating member 71 rotates changes in accordance with the direction of the current flowing in the coil. Therefore, in the filter control unit, the rotation direction of the rotating member 71 can be switched by inverting the polarity (positive electrode, negative electrode) when the current flows through the coil.

The filter driving unit 7 including the above configuration is attached to the housing portion 20 (FIG. 4) of the diaphragm substrate 2 in a positional relationship adjacent to the diaphragm driving unit 5. At this time, the gear portion 78 of the rotating member 71 is disposed so as to protrude from the lower surface side of the diaphragm substrate 2 through the communication hole 10 (FIG. 2).

(gear transmission mechanism)

The gear transmission mechanism 68 is substantially composed of four gears. Specifically, the gear transmission mechanism 68 is composed of the above-described three gear portions 59, 65, and 78 and the intermediate gear 86. Among them, the gear portion 59 corresponds to the first gear, the gear portion 65 corresponds to the second gear, and the gear portion 78 corresponds to the drive gear. The intermediate gear 86 is composed of a spur gear. A shaft hole 86a is provided at the center of the intermediate gear 86.

Fig. 5 is a perspective view showing the arrangement of the gears of the gear transmission mechanism. In addition, FIG. 6 is a schematic view showing the relative positional relationship of the height directions of the respective gears of the gear transmission mechanism. As shown in the figure, the gear portion 59 integrally provided in the filter unit 51 directly meshes with the gear portion 78. Further, the gear portion 65 integrally provided in the filter unit 52 meshes with the gear portion 78 via the intermediate gear 86. The gear portion 59 and the intermediate gear 86 mesh with the gear portion 78 in a position shifted in the tooth width direction of the gear portion 78. Therefore, in the tooth width direction of the gear portion 78, a step G1 is secured between the gear portion 59 and the intermediate gear 86. By the presence of the gap G1, even when the gear portion 59 and the intermediate gear 86 overlap in plan in the operation of the gear transmission mechanism 68, interference (contact) between the two can be avoided. Further, the gear portion 59 and the intermediate gear 86 mesh with the gear portion 78 at different positions in the circumferential direction of the gear portion 78. The intermediate gear 86 meshes with the gear portion 65 and the gear portion 78 at the same time. Further, the gear portion 65 and the gear portion 78 are engaged with the intermediate gear 86 at a position shifted in the tooth width direction of the intermediate gear 86. Therefore, in the tooth width direction of the intermediate gear 86, a step G2 is secured between the gear portion 65 and the gear portion 78. By the presence of the gap G2, even when the gear portion 65 and the gear portion 78 overlap each other in the operation of the gear transmission mechanism 68, interference (contact) between the two can be avoided.

(Partition plate)

The partition plate 7 is formed in a thin plate shape. The partition plate 7 is, for example, the above-mentioned diaphragm blades 3, 4 It is similarly formed by coating a surface of a plate-shaped material containing polyethylene terephthalate with a carbon film to make it conductive. The partition plate 7 is disposed between the diaphragm blades 3 and 4 and the filter units 51 and 52 in the thickness direction of the diaphragm substrate 2.

The partition plate 7 is formed with an opening 91 and four through holes 92a, 92b, 92c, and 92d. The opening 91 is formed in a circular shape in a state of penetrating the partition plate 7. When the partition plate 7 is attached to the diaphragm substrate 2, the opening 91 is disposed concentrically with the opening portion 11 of the diaphragm substrate 2. The four through holes 92a, 92b, 92c, and 92d are fitted to the four pins 12a, 12b, 12c, and 12d provided in the diaphragm substrate 2, respectively.

(cover member)

The cover member 8 is obtained, for example, by molding a resin or the like. The cover member 8 is attached to the lower surface side of the diaphragm substrate 2. At this time, the diaphragm blades 3 and 4, the partition plate 7, and the filter units 51 and 52 are housed between the diaphragm substrate 2 and the cover member 8. The cover member 8 is formed with an opening 94, four through holes 95a, 95b, 95c, and 95d and detachment holes 96a, 96b, and 97. The opening 94 is formed in a circular shape in a state of passing through the cover member 8. When the cover member 8 is attached to the diaphragm substrate 2, the opening portion 94 is disposed concentrically with the opening portion 11 of the diaphragm substrate 2. The four through holes 95a, 95b, 95c, and 95d are fitted to the four pins 12a, 12b, 12c, and 12d provided in the diaphragm substrate 2, respectively. The detachment holes 96a and 96b are designed to avoid interference with the engagement pins 34 and 35 of the actuator member 27. The escape hole 97 is used to avoid interference with the gear portion 78 of the rotating member 71. Further, four attachment pieces 98, ... are formed on the outer peripheral portion of the cover member 8. Each of the attachment pieces 98, ... is locked to the claw portion 16, ... provided on the diaphragm substrate 2, respectively.

<Description of the mounting state of the constituent members>

Next, the mounting state of the constituent members of the diaphragm device 1 will be described.

Two diaphragm blades 3 and 4, a partition plate 7, two filter units 51 and 52, an intermediate gear 86, and a cover member 8 are attached to the lower surface side of the diaphragm substrate 2. Further, a diaphragm driving unit 5 and a filter driving unit 67 are attached to the upper surface side of the diaphragm substrate 2.

When the diaphragm blade 3 is attached to the diaphragm substrate 2, the guide grooves 22a, 22b, and 22c of the diaphragm blade 3 are fitted to the pins 12a, 12c, and 12d of the diaphragm substrate 2.

Further, when the diaphragm blades 4 are attached to the diaphragm substrate 2, the guide grooves 25a, 25b, and 25c of the diaphragm blades 4 are fitted to the pins 12a, 12b, and 12c of the diaphragm substrate 2.

When the partition plate 7 is attached to the diaphragm substrate 2, the through holes 92a, 92b, 92c, and 92d of the partition plate 7 are fitted to the pins 12a, 12b, 12c, and 12d of the diaphragm substrate 2.

When the two filter units 51 and 52 are attached to the diaphragm substrate 2, the shaft hole 60 of the first filter unit 51 and the shaft hole 66 of the second filter unit 52 are respectively fitted and locked to the aperture substrate 2 Supported on the shaft 14.

When the intermediate gear 86 is attached to the diaphragm substrate 2, the shaft hole 86a of the intermediate gear 86 is fitted and locked to the support shaft 15 of the diaphragm substrate 2. At this time, the intermediate gear 86 is meshed with the gear portion 65.

When the cover member 8 is attached to the diaphragm substrate 2, the attachment pieces 98, ... of the cover member 8 are respectively locked to the claw portions 16, ... of the diaphragm substrate 2.

When the diaphragm driving unit 5 is attached to the diaphragm substrate 2, the operating member 27 and the three reduction gears 28, 29, and 30 are attached to the accommodating portion 40 of the diaphragm substrate 2, and the first seat member 31 is attached from above. At this time, the support shafts 42 and 43 are passed through the disengagement holes 36a and 36b of the actuating member 27, and the shaft hole 39 of the actuating member 27 is fitted to the support. On the shaft 41. Further, the shaft hole 29a of the reduction gear 29 is fitted to the support shaft 41 such that the reduction gear 29 is superposed on the actuating gear 38 of the actuating member 27. Further, the engaging pins 34, 35 of the actuating member 27 are protruded from the lower surface side of the diaphragm substrate 2. Then, the engaging pin 34 is engaged with the engaging hole 23 of the diaphragm blade 3, and the engaging pin 35 is engaged with the engaging hole 26 of the diaphragm blade 4. Further, the shaft hole 28a of the reduction gear 28 is fitted to the support shaft 42, and the shaft hole 30a of the reduction gear 30 is fitted to the support shaft 43.

When the filter driving unit 67 is attached to the diaphragm substrate 2, the yoke 75 in which the rotating member 71, the magnet 72, and the like are housed is attached to the upper surface side of the diaphragm substrate 2. At this time, the arm portion 77 and the gear portion 78 of the rotating member 71 are passed through the communication hole 10 (FIG. 2) of the diaphragm substrate 2 to protrude from the lower surface side of the diaphragm substrate 2. Further, the gear portion 78 is meshed with the gear portion 59 and the intermediate gear 86.

As described above, by attaching the respective constituent members of the diaphragm device 1 to the diaphragm substrate 2, the two diaphragm blades 3, 4 are supported by the pins 12a, 12b, 12c, and 12d so as to be linearly movable. Further, the two filter units 51 and 52 are rotatably supported around the support shaft 14, and the intermediate gear 86 is rotatably supported around the support shaft 15.

Next, the operation of the diaphragm device 1 will be described. The operation of the aperture device 1 has a diaphragm adjustment operation and a filter switching operation. Hereinafter, each operation will be described in order.

<Description of aperture adjustment operation>

First, the aperture adjustment operation will be described. The aperture adjustment operation refers to an operation of changing the size of the aperture opening formed by the pair of aperture blades 3, 4. More specifically, the aperture adjustment operation refers to an operation of adjusting the size of the aperture opening by relatively moving the pair of aperture blades 3, 4. Adjusting the size of the aperture opening in the aperture device 1 The operation of adjusting the amount of incident light in the monitor camera or the like having the diaphragm device 1 is substantially the same.

Actually, the size of the aperture opening is adjusted by the aperture device 1 to drive the drive motor 33 of the diaphragm drive unit 5. Then, the driving force of the drive motor 33 is transmitted from the drive gear 37 to the actuating gear 38 via the reduction gear 30, the reduction gear 29, and the reduction gear 28. Then, the actuating member 27 is rotated in accordance with the driving of the drive motor 33.

Further, when the actuating member 27 rotates, the diaphragm blades 3 and 4 that are engaged with the engaging pins 34 and 35 of the actuating member 27 linearly move in the longitudinal direction of the diaphragm substrate 2. At this time, the direction in which the diaphragm blades 3 move and the direction in which the diaphragm blades 4 move are opposite to each other. As described above, when the pair of diaphragm blades 3 and 4 are relatively moved, the size of the diaphragm opening formed by the overlapping of the diaphragm blades 3 and 4 changes. Therefore, the size of the aperture opening can be adjusted by changing the amount of rotation and the direction of rotation of the drive motor 33.

<Description of filter switching action>

Next, the filter switching operation will be described.

The filter switching operation refers to an operation of switching the optical filters (54, 61) disposed on the incident light path. More specifically, the filter switching operation refers to an operation of switching the arrangement state of the optical filters 54 and 61 from the first configuration state to the second configuration state or from the second configuration state to the first configuration state. The first arrangement state refers to a state in which the optical filter 54 is disposed through the incident light path of the aperture opening, and the optical filter 61 is retracted from the incident light path. The second arrangement state refers to a state in which the optical filter 61 is disposed on the incident light path and the optical filter 54 is retracted from the incident light path.

Here, in the first arrangement state, as shown in FIG. 7, the optical filter 54 of the first filter unit 51 is disposed in and out of the opening portion 11 (FIG. 2) of the diaphragm substrate 2, The optical filter 61 of the second filter unit 52 is disposed to be retracted from the opening 11 . Fig. 8 is a perspective view showing the positional relationship of the respective portions in the first arrangement state, and Fig. 9 is a view taken along the arrow E of Fig. 8. When the arrangement state of the optical filters 54 and 61 is switched from the first arrangement state to the second arrangement state, the gear portion 78 is rotated counterclockwise from the state of FIG. Then, the intermediate gear 86 and the gear portion 59 rotate in the clockwise direction, and the gear portion 65 rotates in the counterclockwise direction. Further, the first filter unit 51 is rotationally moved clockwise about the support shaft 14, and the second filter unit 52 is rotationally moved counterclockwise about the support shaft 14. As a result, the position of the first filter unit 51 and the position of the second filter unit 52 are exchanged.

On the other hand, in the second arrangement state, as shown in FIG. 10, the optical filter 61 of the second filter unit 52 is disposed in and out of the opening portion 11 (FIG. 2) of the diaphragm substrate 2, and the first filter is disposed. The optical filter 54 of the mirror unit 51 is disposed to be retracted from the opening 11 . Figure 11 is a perspective view showing the positional relationship of the respective portions of the second configuration state. Figure 12 is a view of the arrow F of Figure 11; When the arrangement state of the optical filters 54 and 61 is switched from the second arrangement state to the first arrangement state, the gear portion 78 is rotated clockwise from the state of FIG. Then, the intermediate gear 86 and the gear portion 59 rotate in the counterclockwise direction, and the gear portion 65 rotates in the clockwise direction. Further, the first filter unit 51 is rotationally moved counterclockwise about the support shaft 14, and the second filter unit 52 is rotationally moved clockwise about the support shaft 14. As a result, the position of the first filter unit 51 and the position of the second filter unit 52 are exchanged.

When the optical filters 54 and 61 disposed on the incident light path are actually switched by the aperture device 1, the following filter switching operation is performed. That is, the magnetic field is formed by energizing the coil provided in the filter driving unit 67. Then, the rotating member 71 rotates according to the direction and intensity of the magnetic field formed by energization of the coil, and the rotation thereof The driving force is transmitted to the respective filter units 51, 52 via the gear transmission mechanism 68. Specifically, the rotational driving force of the rotating member 71 transmits the gear portion 78 from the gear portion 78 to the gear portion 59 as a common driving gear, and is transmitted from the gear portion 78 to the gear portion via the intermediate gear 86. 65. At this time, the transmission of the driving force of the self-rotating member 71 toward the first filter unit 51 is performed by the two gears (59, 78), and the driving force of the self-rotating member 71 toward the second filter unit 52 is transmitted. It is carried out by three gears (65, 78, 86). Therefore, the two filter units 51 and 52 are rotationally moved in opposite directions with respect to the support shaft 14 as a center. Further, the positions of the optical filters 54, 61 of the two filter units 51, 52 are exchanged before and after the above-described rotational movement.

In the above-described filter switching operation, the teeth of the gear portion 59 and the teeth of the gear portion 65 are reciprocated in a state in which the positions are vertically shifted in the same circular orbit with the support shaft 14 as the center. Further, the teeth of the gear portion 59 and the teeth of the intermediate gear 86 overlap in plan view during the filter switching operation. However, the step G1 shown in FIG. 6 does not interfere with each other and is shifted. Further, the teeth of the gear portion 65 and the teeth of the gear portion 78 overlap in the plan view during the filter switching operation. However, the step G2 shown in FIG. 6 does not interfere with each other and is shifted. Therefore, the four gears (59, 65, 78, 86) constituting the gear transmission mechanism 68 can be smoothly operated. Further, by the gear transmission mechanism 68, the driving force of the filter driving portion 67 can be surely transmitted to the two filter units 51, 52.

<Effects of the embodiment>

According to the embodiment of the present invention, as compared with the applicant's prior application (Japanese Patent Application No. 2012-220064), the following effects can be obtained.

In other words, the configuration of the gear transmission mechanism 68 that transmits the driving force of the filter driving unit 67 to the two filter units 51 and 52 is made in comparison with the prior invention. According to the above embodiment, three intermediate gears are used, and one intermediate gear 86 may be used. Therefore, it is possible to reduce the number of parts of the gear transmission mechanism 68 and to save space. Further, since the number of gears constituting the gear transmission mechanism 68 is small, the influence of the backlash becomes small.

Further, in the above-described embodiment, the meshing position of the gear portion 59 and the intermediate gear 86 with respect to the gear portion 78 is shifted in the tooth width direction of the gear portion 78, and the gear portion 78 and the gear are provided in the tooth width direction of the intermediate gear 86. The meshing position of the portion 65 with respect to the intermediate gear 86 is shifted. Therefore, the interference of the gears constituting the gear transmission mechanism 68 can be avoided, and the gears (59, 65, 78, 86) can be densely arranged. Thereby, the size and thickness of the filter switching mechanism 53 including the gear transmission mechanism 68 can be reduced.

Further, for reference, the effects obtained by the applicant's previous invention are also described below.

In the above-described embodiment, the optical filters 54 and 61 disposed on the incident light path are switched by exchanging the positions of the two filter units 51 and 52. Therefore, the filter can be reduced in comparison with the conventional configuration. Space for mirror switching. In other words, as in the conventional configuration, when the filter support member in which the two optical filters are arranged adjacent to each other is moved, it is necessary to arrange only three optical filters in a space for the filter switching. space. On the other hand, in the configuration in which the positions of the first filter unit 51 and the second filter unit 52 are exchanged before and after the rotational movement, the space for the filter switching is substantially only required to be arranged and arranged. The space of the two optical filters 54, 61 is sufficient. Therefore, it is known to narrow the space for filter switching. As a result, the size of the diaphragm device 1 can be reduced. In particular, when the size of the imaging element is to be increased as a countermeasure against the high resolution of the surveillance camera or the like, and the maximum diameter of the aperture opening is largely ensured, the aperture device 1 is not required to be extremely increased. , the maximum diameter of the aperture opening can be enlarged.

In the conventional configuration, when an impact force is applied to the aperture substrate Next, the filter support member is often biased in one direction by the magnetic force of the magnet so that the filter support member does not move inadvertently due to the impact force (positional misalignment). Therefore, in the case where the optical filter is switched by the movement of the filter supporting member, in order to apply a larger magnetic force to the filter supporting member, it is necessary to supply the filter driving portion (coil or the like) to some extent. The big operating voltage.

On the other hand, in the above embodiment, when an impact force is applied to the diaphragm substrate 2, the impact force acts as follows. That is, the impact force applied to the diaphragm substrate 2, for example, acts in a direction to prevent the movement of the first filter unit 51 in the direction in which it is moved, and acts in the direction in which the second filter unit 52 is prevented from moving. The reason is as follows. First, when an impact force is applied to the diaphragm substrate 2 in a direction parallel to the moving direction of the diaphragm blades 3, 4, a moving force is applied to each of the filter units 51, 52 in a rotation direction about the support shaft 14. At this time, each of the filter units 51, 52 is subjected to a movement force of substantially the same magnitude in the same direction, but the gears of the gear transmission mechanism 68 mesh with each other to prevent movement in the same direction. Therefore, even if an impact force is applied to the diaphragm substrate 2, the movement of the filter units 51, 52 can be suppressed. Thereby, the magnetic force (capacity) of the above magnet can be weakened. Further, even if the magnetic force of the magnet is not utilized depending on the situation, the required impact resistance can be ensured. As a result, the optical filter can be switched with a smaller operating voltage. In addition, it is possible to reduce the power consumption by ensuring the necessary impact resistance.

In the above embodiment, since the two filter units 51 and 52 having the common support shaft 14 as the center of rotation are rotatably supported, the operation of each of the filter units 51 and 52 is compact. Therefore, it is possible to contribute to the minimization of the space for filter switching. Further, since the configuration in which the two filter units 51 and 52 are moved by using the gear transmission mechanism 68 is adopted, the configuration of the drive system becomes very compact.

In the above embodiment, the pair of aperture blades 3, 4 and 2 filter sheets A partition plate 7 is disposed between the elements 51, 52 to avoid interference (contact) of the positions. Therefore, by arranging the partition plate 7 in the middle, the diaphragm blades 3, 4 and the filter units 51, 52 can be arranged close to each other. On the other hand, in the case where the partitioning plate 7 is not provided, in order to avoid interference between the diaphragm blades 3 and 4 and the filter units 51 and 52, it is necessary to arrange them so as to be largely spaced apart. Therefore, in the case where the partitioning plate 7 is provided, the total thickness can be made thinner than in the case where the partitioning plate is not provided. In particular, in the case where a single focus lens or the like (so-called strong light lens) is used in the optical system, it is necessary to arrange the front side of the aperture opening (the subject side) of the aperture device 1 in the optical system. The lens and the lens disposed on the rear side are disposed close to each other. Therefore, in the aperture device 1, it is very effective to reduce the thickness of the vicinity of the aperture opening interposed between the lenses.

<Modifications, etc.>

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications and improvements are also possible in addition to the specific effects that can be derived from the constituent elements of the invention and the combinations thereof.

For example, in the above-described embodiment, the gear portion 59 is integrally formed in the filter supporting member 55. However, the present invention is not limited thereto, and the filter supporting member 55 and the gear portion 59 may be different members, and the gear may be used using an adhesive or the like. The portion 59 is fixed to the filter support member 55. This is also similar to the filter support member 62 and the gear portion 65.

Further, the combination of the optical filters to be switched is not limited to a combination of different types of optical filters, and may be a combination of optical filters of the same kind (only the optical characteristics are different).

Further, the filter switching device of the present invention can be widely applied to various optical devices including an aperture device and a camera.

1‧‧‧ aperture device

2‧‧‧ aperture substrate

3, 4‧‧‧ aperture blades

5‧‧‧Aperture Drive Department

6‧‧‧Filter switching device

7‧‧‧ partition board

8‧‧‧ Cover member

10‧‧‧Connected holes

11‧‧‧ openings

12a, 12b, 12c, 12d‧‧ ‧ sales

14, 15‧‧‧Support shaft

16‧‧‧ claws

21‧‧‧Bend

22a, 22b, 22c‧‧‧ guiding slots

23‧‧‧Snap hole

24‧‧‧ Hole Department

25a, 25b, 25c‧‧‧ guiding slots

26‧‧‧Snap hole

34, 35‧‧‧ card sales

51‧‧‧First filter unit

52‧‧‧Second filter unit

53‧‧‧Filter switching mechanism

54‧‧‧Optical filter

55‧‧‧Filter support member

56‧‧‧ openings

57‧‧‧Filter support frame

58‧‧‧ base

59‧‧‧ Gear section (1st gear)

60‧‧‧ shaft hole

61‧‧‧Optical filter

62‧‧‧Filter support member

63‧‧‧Filter support frame

64‧‧‧ base

65‧‧‧ Gear section (2nd gear)

66‧‧‧Axis hole

68‧‧‧Gear transmission mechanism

71‧‧‧Rotating components

76‧‧‧ Magnet Holder

77‧‧‧arms

78‧‧‧ Gear section (drive gear)

86‧‧‧Intermediate gear

86a‧‧‧Axis hole

91‧‧‧ openings

92a, 92b, 92c, 92d‧‧‧ through holes

94‧‧‧ openings

95a, 95b, 95c, 95d‧‧‧through holes

96a, 96b, 97‧‧‧ detached holes

98‧‧‧Installation

Claims (4)

A filter switching device, comprising: a first filter unit and a second filter unit, each having an optical filter configured to be disposed in an incident light path through which incident light passes; and filtering a mirror switching mechanism that rotatably supports the first filter unit and the second filter unit, and positions the first filter unit and the second filter unit before and after the rotational movement In an exchange manner, the first filter unit and the second filter unit are rotationally moved in opposite directions, thereby switching an optical filter disposed in the incident light path, and the filter switching mechanism is provided a filter driving unit for generating a driving force for rotationally moving the first filter unit and the second filter unit, and a driving force for transmitting the filter driving unit to the first filter unit and The gear transmission mechanism of the second filter unit, wherein the gear transmission mechanism includes a drive gear that is driven by the filter drive unit, and is provided in the a first gear of the filter unit, a second gear disposed in the second filter unit, and an intermediate gear, wherein the first gear train directly meshes with the drive gear, and the second gear train is coupled to the intermediate gear via the intermediate gear The drive gears described above are engaged. The filter switching device according to claim 1, wherein the first gear and the intermediate gear are offset from a position in a tooth width direction of the drive gear to mesh with the drive gear, and the drive gear and the first The two gears are staggered in the tooth width direction of the intermediate gear to mesh with the intermediate gear. An aperture device characterized by comprising: A filter switching device according to claim 1 or 2; and a diaphragm member that forms an aperture opening through which the incident light passes. A camera characterized by comprising: an aperture device of claim 3 of the patent application.