JP2015138068A - optical unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the unintentional rotation of a turret-type optical unit when the unit receives an impact by eliminating the large displacement of a gravity center from a rotating shaft resulting from the existence/non-existence of a mounted part, and alleviating an influence of the moment.SOLUTION: An optical unit has: a rotating shaft; a disc-shaped holding member having at least three opening parts; a disc unit composed of a plurality of pieces of optical filters which are arranged so as to cover the opening parts, and fixed to the holding member; and a support member which supports the disc unit so as to be rotatable with the rotating shaft as a center. In the optical unit, a gravity center of the disc unit is decentered with respect to a rotating axial center of the holding member. A hollow form is formed in a region which is located at an opposite side with the opening part not covered with the optical filers and the rotating shaft sandwiched, and surrounded by a contour of the holding member between the two adjacent opening parts which are covered with the optical filters.

Description

  The present invention relates to a turret type optical unit.

  Conventionally, a turret-type optical unit that changes the type of optical filter by mounting multiple optical filters on a disc-shaped holding member (hereinafter referred to as a turret) and rotating the turret around its axis is installed. There is an imaging device.

  However, in the turret type optical unit, the weight balance of the turret is different, for example, the weight of the mounted optical filter is different from each other, or there is a portion where the optical filter is mounted and a portion where only the opening is vacant. If the center of gravity does not coincide with the center of the turret rotation axis, the center of gravity is reduced when the turret optical unit inside the imaging device is impacted by dropping the imaging device. There was a problem that the turret was inadvertently rotated due to the moment generated according to the deviation.

  As a method of correcting such a deviation of the center of gravity of the rotating body, Patent Document 1 proposes a method of removing a small portion of a part of the rotating body by laser light irradiation to bring the center of gravity closer to the center of rotation. .

JP 2010-75973 A

  However, in the method as disclosed in Patent Document 1, it is not possible to correct a large change in the center of gravity, which is caused by the difference in presence or absence of the optical filter in the turret described above. It is impossible to prevent the turret from rotating inadvertently.

  In the present invention, in the turret type optical unit, it is inadvertent when the turret type optical unit receives an impact by eliminating the large center of gravity deviation from the rotating shaft caused by the presence or absence of mounted parts and reducing the influence of the moment. The purpose is to prevent rotation.

  The optical unit of the present invention is capable of rotating around a certain axis and covers a disc-shaped holding member provided with at least three openings and some of the openings. In the optical unit that is arranged in such a manner and is composed of a plurality of optical filters fixed to the holding member, the center of gravity is decentered with respect to the rotation axis center of the holding member, the side of the adjacent optical filter and the holding In the region surrounded by the outer shape of the member, a lightening shape is provided.

As explained above, according to the turret type optical unit of the present invention,
By eliminating the large center-of-gravity shift from the rotation axis caused by the presence or absence of mounted components and mitigating the influence of the moment, the turret optical unit can be prevented from rotating carelessly when subjected to an impact.

Exploded perspective view of turret unit Turret front view Diagram with no hole in the turret unit Diagram with a hole in the turret unit Perspective view of turret unit and drive unit Side view of turret unit and drive unit Enlarged side view of the turret unit and drive unit Front view of lock parts a, b Front view and side view of lock drive unit Perspective view of turret unit, lock drive unit and lock parts a, b, c Front view, rear view and rear enlarged view of FIG. a, b Figure of unlocking from Figure 7a, Figure 7b a, b Optical unit and its peripheral exploded perspective view a, b Front view and side view showing the positional relationship during assembly of the turret unit and the drive unit a, b, c Front view of turret unit a, b Diagram showing relationship between photo interrupter and detection rib Photo interrupter signal waveform Overall view of an imaging apparatus equipped with the optical unit of the present invention Schematic showing the combination of two turret units System block diagram of the present invention Flow chart of the present invention Front view showing the arrangement relationship of the R-shaped part of the tip of the turret unit, the lock part, and the drive The figure showing the state where the lock parts are half-coupled to the turret unit The figure which showed how the gear range by which the R shape was formed at the front-end | tip with respect to the turret unit 100, a locking component, and a drive part are arrange | positioned.

  First, the first embodiment will be described.

  FIG. 14 is a perspective view showing the configuration of the entire imaging apparatus equipped with the optical unit of the present invention. In the drawing, the Z1 direction is the subject side, and the Z2 direction is the photographer side. In the following description, for convenience, the Z1 side will be referred to as the front and the Z2 side will be referred to as the rear.

  In the imaging device 1400, the lens 1402 can be attached to and detached from the lens mount 1401. An optical unit 1403 according to the present invention is disposed behind the lens mount 1401. Reference numeral 1404 denotes an operation button for operating the optical unit 1402. By pressing the operation button 1404, the photographer can switch the optical filter in the optical unit to a desired optical filter. Details will be described later. Further, an imaging element (not shown) is provided further rearward of the optical unit 1403, and a battery storage unit 1405 and a recording unit 1406 are provided further rearward thereof.

  Hereinafter, details of the optical unit of the present invention will be described.

  FIG. 1 a is an exploded perspective view of the turret unit 100 that is a component of the optical unit of the present invention, and FIG. 1 b is a front view of the turret 101 that is a component of the turret unit 100. Also, the Z axis in FIG. 1 a is the rotation axis of the turret unit 100.

  The turret 101 has a disk shape centered on the Z axis, and a gear 102 is formed on the outer periphery. An R is formed at the tip of a part of the outer peripheral gear 102. The reason will be described later. In addition, a hole 112 for inserting a rotation shaft for rotating in the α and β directions around the Z axis is provided. Further, sliding ribs 103a and 103b (which are not shown in FIG. 1a because 103b is on the opposite surface of 103a) and the turret position, which become sliding surfaces when rotating around the Z axis, are set. Detection ribs 104 are provided for detection. In the detection rib 104, slits 105a and 105b are formed.

  As shown in FIG. 1b, three openings 106a to 106c are provided every 120 ° in the disc-shaped interior of the turret 101, and two of the openings 106a, 106b, The optical filters 107a and 107b are attached so as to overlap. Examples of the optical filter include an ND (darkening) filter. Reference numerals 118a and 118b are portions serving as attachment seats for the optical filters 107a and 107b. The optical filters 107a and 107b are attached to the attachment seats 118a and 118b of the turret 101, and then attached to the adhesive grooves 108a to 108d provided in the turret 101. The adhesive is bonded by being poured and fixed to the turret 101.

  Reference numeral 109 denotes a pressing metal plate made of a thin plate-like metal, which prevents the optical filters 107a and 107b from being dropped when the optical filters 107a and 107b are peeled off, and contacts the optical filters 107a and 107b to charge the optical filters 107a and 107b. It has a role to prevent the adhesion of dust due to static electricity. The presser metal plate 109 is provided with relief holes 114 having a diameter larger than that of the sliding rib 103 in order to prevent interference between the three openings 110a to 110c and the sliding rib 103 of the turret 101 during assembly, like the turret 101. ing. After the optical filters 107a and 107b are bonded to the turret 101, the presser sheet metal 109 is put on the turret 101, and the screws 111a to 111c are inserted into the self-tap holes 120a to 120c provided in the turret 101 through the fool holes 119a to 119c. Fixed by hitting.

  Further, the turret 101 and the presser metal plate 109 are provided with the lightening holes 116 and 117 in addition to the holes and the openings described above.

  Next, the effect of the lightening holes 116 and 117 provided in the turret unit 100 will be described with reference to FIGS. 2A and 2B.

  FIG. 2a shows an assembled front view of the turret unit 200 when the above-described hollow holes 116 and 117 are not provided as an example, and FIG. 2b shows the turret unit when the hollow holes 116 and 117 are provided. 100 is an assembly front view.

  In FIG. 2a, the center of gravity of the turret unit 100 as a whole is the center of the turret unit 100 due to the weight difference between the portion where the optical filters 107a and 107b are attached and the opening 106c where the optical filter is not attached. The point P shifts to the A point. In this state, when the turret unit 100 receives an impact or the like from the outside, a moment force corresponding to the deviation of the center of gravity is generated, and the turret unit 100 rotates in the α or β direction.

  On the other hand, in FIG. 2b, the fan-shaped hole (range S) surrounded by the outer periphery of the optical filters 107a and 107b and the turret unit 100 on the opposite side of the opening 106c with the rotation axis P point therebetween 116, 117 is provided so that the center of gravity of the turret unit 100 is shifted from the central point P to the B point, closer to the center of the turret unit 100 than the A point. The moment force generated according to the deviation of the center of gravity when receiving the force can be weakened, and the turret unit 100 can be prevented from rotating in the α or β direction.

  As will be described later, even when the turret unit 100 is provided with a lock member or the like for holding the posture separately, for example, an unexpected impact when the turret unit is rotating (unlocked), for example. Since the locking force of the lock member can be made weaker even during locking, the lock member can be reduced in size.

  Next, the structure of the drive means for rotating the turret unit 100 described above will be described. FIG. 3A is a view showing the relationship between the turret unit 100 and the drive unit 300 for rotating the turret unit 100, and FIG. 3B is a side view of FIG. 3A viewed from the x1 direction. The drive unit 300 includes a drive motor 302, a mounting sheet metal 303, a shaft 304, a pinion gear 305, and an intermediate transmission gear 306. The drive motor 302 is connected to a flexible substrate (not shown) at the electrical contact portion 310, and can receive either a forward current or a reverse rotation by receiving a drive current and an electrical signal.

  The attachment sheet metal 303 is a component for fixing the drive motor 302 to a front cover described later. The pinion gear 305 is press-fitted into the shaft 304 and transmits the power of the drive motor 302 to the intermediate transmission gear 306. Further, as shown in FIG. 3b, the intermediate transmission gear 306 is a two-stage gear, and the power received from the pinion gear 305 by the first-stage gear 307 is transmitted to the gear portion 102 of the turret unit 100 by the second-stage gear 308. .

  With the above configuration, the turret unit 100 can be rotated in the α or β direction by the forward or reverse rotation of the drive motor 302.

  In addition, since the intermediate transmission gear 306 is used, the drive motor 302 can be disposed so as to overlap in the thickness direction of the turret unit 100, and therefore, compared with a configuration that does not use the intermediate transmission gear as shown in FIG. The protrusion amount of the motor 302 (drive motor 332) can be suppressed, and a small configuration can be achieved (L1 <L2).

  Next, a lock mechanism for holding the turret unit 100 at a predetermined position will be described.

  In FIG. 4, 401 is a lock part for holding the turret unit 100 described above at a predetermined position. The lock part 401 is rotatable about the shaft hole 402 in the γ and ε directions. Reference numeral 403 denotes a meshing portion, which is a portion that actually locks. Further, the engagement portion 403 has an R shape at the tip. As will be described later, the lock component 401 normally has an urging force in the γ direction acting by an urging spring, and rotation in the ε direction is performed by pressing the projection 404.

  FIG. 5a shows a configuration of the lock driving unit 500 for operating the above-described lock component 401, and FIG. 5b is a view of FIG. 5a seen from the X2 direction. The lock drive unit 500 includes a lock drive motor 502, a mounting sheet metal 503, a worm gear 504, a slide shaft 505, and a rack 507. However, the slide shaft 505 in FIG. 5a is actually engaged with the slide shaft hole 508 inside the rack 507, and the slide shaft 505 and the slide shaft hole 508 are indicated by broken lines for the sake of explanation.

  The lock driving motor 502 is connected to a flexible substrate (not shown) at the electric contact portion 510 to receive a driving current and an electric signal.

  The attachment metal plate 503 is a metal plate for holding the lock driving unit 500 on an outer cover described later. Further, a slide shaft 505 is caulked to the attachment metal plate 503. The rack 507 engages with the slide shaft 505 in the slide shaft hole 508, meshes with the worm gear 504 in the transmission portion 509 (see FIG. 5b (see X2)), and the forward and reverse rotations of the lock drive motor 502 cause y1, y2 It can move in the direction. The contact surface 512 of the rack 507 is a surface for pushing the projection 404 of the lock component 401 described above.

  Next, a configuration for holding the turret unit 100 using the lock component 401 and the lock drive unit 500 described above will be described.

  FIGS. 6 and 7a to 7c show a locked state in which the mesh portion 403 of the lock component 401 is engaged with the gear portion 102 of the turret unit 100. FIG.

  7a is an enlarged view of the periphery of the lock drive unit 500 from the front of FIG. 6, FIG. 7b is an enlarged view of the periphery of the lock drive unit 500 from the rear of FIG. 6, and FIG. 7c is a further enlarged view of part of FIG. FIG. However, for the sake of explanation, the front cover 700 and the coil spring 701 are omitted in FIGS. 6 and 7a.

  In the locked state, as shown in FIG. 7 a, the pressing surface 512 of the rack 507 is not in contact with the protrusion 404 of the lock component 401.

  Further, as shown in FIG. 7 b, the lock component 401 is urged in the γ direction by a coil spring 701 assembled to the outer cover 700. At this time, as shown in FIG. 7c, the meshing portion 403 is held down in the γ direction by the biasing force of the coil spring 701 at the contact points E1 and E2 with the gear portion. Further, as described above, an R shape is formed at the tip of a part of the gear portion 102 of the turret. This avoids a case in which when the turret unit 100 stops from a predetermined position and stops, the tip of the gear portion 102 and the tip of the engaging portion 403 of the lock part 401 come into contact with each other and the lock is not applied. Because.

  For example, FIG. 19 shows a state in which the engagement portion 403 of the lock component 401 has abutted at the contact point E3 with the gear 102 because the turret unit 100 has stopped while being shifted in the α direction from the predetermined position. ing. Even in such a case, since the gear tip 1902d is formed with an R shape, the gear tip 1902d and the tip R shape of the meshing portion 403 come into contact with each other, so that the turret unit 100 has a coil spring 701 at the contact point E3. The vertical force F1 is received from the urging force, and the turret unit 100 is rotated in the β direction by the component force F2 of F1 to be guided to a predetermined position and can be locked.

  The R shape of the gear tip does not have to be formed in all the gear portions 102 of the turret, and only the tip of the gear portion where the engagement portion 403 of the lock part 401 is fitted at a predetermined position where the turret unit 100 stops. By doing so, the loss of the transmission efficiency with the drive part 300 mentioned above can be suppressed to the minimum.

  Alternatively, as a unit specification, if the gear portion of the turret unit and the meshing portion of the lock part are allowed to shift by several teeth, by forming R at the tips of all the gear portions in the range, In this range, loss of transmission efficiency with the drive unit 300 can be minimized while avoiding the lock being lost.

  For example, in this embodiment, since the deviation of the meshing portion 403 between the turret unit 100 and the lock component 401 is acceptable for one tooth, in FIG. 19, when the gear portion 102 is originally stopped at a predetermined position, the meshing is performed. A tip R shape is formed with respect to the gear tips 1902a to 1902e corresponding to the gear portion in contact with the fitting portion 403 plus one front and rear tooth.

  FIG. 20 is a diagram showing how the gear range having the R shape formed at the tip, the lock component, and the drive unit are arranged with respect to the turret unit 100.

  Assuming that the gear range in which the tip R is formed is S1, as shown in FIG. 20, ranges S2 and S3 in which the tip R shape equivalent to the range S1 is formed are formed every 120 degrees with respect to the turret unit 100. ing. Thereby, even if the turret unit 100 stops at any predetermined position provided every 120 degrees, an R is formed at the tip of the gear portion 102 where the engagement portion 403 of the lock component 401 is fitted. become.

  Further, the intermediate transmission gear 306 for transmitting the power from the drive motor 302 to the turret unit 100 is arranged at a place avoiding the above-described ranges S1 to S3. That is, even if the turret unit 100 stops at any predetermined position, the intermediate transmission gear 306 does not mesh with the gear portion 102 in the range of S1 to S3. This is because at the moment when the turret unit 100 starts rotating from a state where it is stopped at a predetermined position, that is, the moment when the acceleration of the drive motor 302 becomes the largest, the transmission loss of power from the drive unit 300 is the largest. This is because the rotational operation and the load on the drive motor 302 are affected.

  FIGS. 8a and 8b show a state in which the lock 507 is moved in the y1 direction by operating the lock driving unit 500 from the states of FIGS. 7a and 7b, and the lock is released.

  The contact surface 512 and the projection 404 that are not in contact with each other in the state of FIG. 7a are in contact with each other, and the projection 404 is pushed up in the y1 direction by a force that resists the force of the coil spring 701. The lock is released by releasing from 102.

  Note that the position control of the lock drive unit 500 accompanying the above-described lock / unlock operation includes, for example, a method using a photo interrupter or a method using the number of steps of the drive motor 502, but details are omitted. .

  Next, the optical unit including the turret unit 100, the driving unit 300, and the lock driving unit 500 described above and the surrounding configuration will be described.

  9a and 9b are exploded perspective views of the optical unit 900 of the present invention and peripheral components. 9A and 9B, the Z axis is the rotation center of the turret unit, and the Z ′ axis is the axis (optical axis) that is the optical center during imaging. In the optical unit 900, a turret unit 950 having the same configuration as that of the turret unit 100 is arranged in series along the Z axis, and accordingly, a drive unit 930 for driving the turret unit 950, and the turret unit 950 are locked. A lock component 909 and a coil spring 910 are also mounted.

  The front cover 901 is a basic cover for attaching each element. Behind the front cover 901 are bosses 908a and 908b for fixing the mounting sheet metal 503 of the lock unit 500 with screws 904a and 904b, a lock part 401 and a coil spring 701 for locking the turret unit 100, respectively. A lock rotation shaft 914 that serves as a rotation shaft for the component 401, a lock component 909 that locks the singlet unit 950, and a coil spring 910 are attached, and a lock rotation shaft 915 that serves as a rotation shaft for the lock component 909 and a drive unit 300 are attached. The bosses 922a and 922b for fixing the sheet metal 303 with screws 920a and 920b, the intermediate transmission gear 306, the gear rotation shaft 924 serving as the rotation shaft of the intermediate transmission gear 306, and the mounting sheet metal 933 of the drive unit 930 are also provided. Secure with screws 935a and 935b Bosses 966a and 966b for holding the intermediate transmission gear 936, and a gear rotation shaft 938 serving as a rotation shaft of the intermediate transmission gear 936 and a shaft hole 112 of the turret unit 100, and the rotation shaft of the turret unit 100 A turret rotating shaft 925, a sliding surface 927 with respect to the sliding rib 103a of the turret unit 100, and bosses 940a to 940c for fixing the rear cover 928 with screws 929a to 929c are provided.

  Further, from the front of the front cover 901, a transparent glass 956 that seals the opening of the front cover 901 and transmits light is attached by double-sided tape (not shown), and the above-described photo interrupters 130a and 130b are provided on the front cover 901. The holes 939a and 939b are attached to each other by outer shape matching.

  The lock component 909 for locking the turret unit 950 is pushed simultaneously with the lock component 420 by the rack 507 of the lock drive unit 500 to be unlocked. The turret shaft 941 is disposed between the turret units 100 and 950, and the rear shaft 942 is fitted with the shaft hole 943 of the turret unit 950 and becomes the rotation shaft of the turret unit 950. Further, the turret shaft 941 is provided with a sliding surface 938a which is a contact surface to the sliding rib 103b of the turret unit 100 and a 938b which is also a contact surface to the sliding rib 951a of the turret unit 950. It also serves to prevent contact between 100 and 950. A shaft 946 in front of the turret shaft 941 has a D-cut shape and is attached by being fitted into a D-shaped recess 947 provided in the front cover 901 so as not to rotate.

  The rear cover 928 is provided with a sliding surface 955 for the sliding rib 951b of the turret unit 950, and a low-pass filter 961 is not shown from the rear of the rear cover so as to seal the opening of the rear cover 928. It is attached with double-sided tape. The photo interrupters 962a and 962b are attached to the holes 963a and 963b of the rear cover 1050 by matching their outer shapes.

  The photo interrupters 130a, 130b and 962a, 962b are actually mounted on a flexible board (not shown), and exchange electric signals through the flexible board.

  The image sensor 970 and the sensor substrate 971 on which the image sensor 970 is mounted are held by adhesion to the sensor plate 972. The sensor plate 972 is fixed to the imaging apparatus main body by an attachment part (not shown). The rear cover 928 and the image sensor 970 are assembled so that the dust-proof elastic member 982 is sandwiched in a charged state. Therefore, the optical unit 928 and the image sensor 970 are hermetically sealed so that dust or the like is sealed. Has a structure that does not invade.

  In the above configuration, the transparent glass 956, the optical filter 107b, the opening 983, the low-pass filter 961, and the image sensor 970 are arranged in series on the optical axis Z ′. That is, light entering from the front is transmitted through the transparent glass 956, the optical filter 107b (107a or opening 106c), the opening 983 (or optical filters 984a and 984b), and the low-pass filter 961, and the image sensor 970. Is imaged.

  FIGS. 10a and 10b are views showing the arrangement relationship of the turret units 100 and 950, the drive units 300 and 930, and the intermediate transmission gears 306 and 936 after assembly from the front and side. As shown in FIGS. 10a and 10b, the driving unit 300 and the intermediate transmission gear 306, and the driving unit 930 and the intermediate transmission gear 936 are symmetric with respect to the Y axis and opposite to the Z axis direction. Be placed. This is because the drive units 300 and 930 are arranged in the lateral direction of the two turret units 100 and 950, thereby minimizing the thickness L3 in the Z-axis direction and the width X3 in the X direction as an optical unit (possible) It is an arrangement for minimizing (within a certain range).

  Next, the switching operation of the two turret units 100 and 950 will be described. FIG. 15 is a diagram schematically showing combinations of turrets.

  In the present embodiment, the combination passing through the optical axis of the turret units 100 and 950 is basically an optical filter + aperture or an aperture + optical filter, and there is always one optical filter that transmits simultaneously. This is to prevent deterioration in image quality due to the fact that two optical filters are simultaneously transmitted and a light amount drop occurs according to the transmittance.

  At this time, there are four combinations of the openings 106c and 983 and the optical filters 107a, 107b, 984a, and 984b as shown by 1-4 in FIG. Switching from 1 to 2 rotates the turret unit 950 in the β direction by 120 degrees. Switching from 2 to 3 rotates the turret unit 100 in the α direction by 120 degrees and the turret unit 950 in the β direction by 120 degrees. Thus, switching from 3 to 4 can be performed by rotating the turret unit 100 by 120 degrees in the α direction. That is, in any combination, it is possible to switch to a desired optical filter + opening combination by rotating one or both of the turret units 100 and 950 in the α or β direction by 120 degrees.

  Next, the system of the optical unit 900 will be described with reference to the system block diagram of FIG.

  Upon receiving an operation signal from the operation button 1404, the control unit 1601 starts the operation of the lock driving unit 500 and the turret driving units 300 and 930, and the lock detection unit 1602 and the turret detection units (photo interrupters) 130a, 130b, 962a, The operation of the lock driving unit 500 and the turret driving units 300 and 930 is stopped in response to the signal from 962b. The lock drive unit 500 and the turret drive units 300 and 930 operate and stop the lock components 401 and 909 and the turret units 100 and 950, respectively, according to the signals.

  Next, a method for detecting the position of the turret units 100 and 950 by the photo interrupters 130a, 130b, 962a, and 962b, which are the detection units, and control thereof will be described. However, since the detection method and control of the positions of the turret unit 100 and the turret unit 950 are the same, only the turret unit 100 will be described here.

  11a to 11c are front views after the turret unit 100 is assembled. FIG. 11b shows a state where the turret unit 100 is rotated 120 degrees in the α direction from FIG. 11a, and FIG. 11c shows a state where the turret unit 100 is further rotated 120 degrees in the α direction from FIG. For the sake of explanation, photo interrupters 130a and 130b, which are parts attached to the front cover, are displayed.

  The slits 105a and 105b are provided 120 degrees apart as in the relationship between the openings 106a to 106c. Photo interrupters 130a and 130b are arranged at two positions directly above the detection rib 104 or the slits 105a and 105b. The photo interrupters 130a and 130b are also arranged 120 degrees apart like the slits 105a and 105b and the openings 106a to 106c. 12A shows a state in which the detection rib 104 blocks the light of the photo interrupter 130a (130b). FIG. 12B shows a state in which the detection rib 104 does not block the light of the photo interrupter, that is, the slit 105a (105b) has a photo interrupter 130a (130b). The state located between is shown.

  As shown in FIGS. 12a and 12b, the photo interrupter 130a (or 130b) can detect the position of the object by the light receiving unit 1202 detecting whether or not the object blocks the light from the light emitting unit 1201. it can. FIG. 13 shows the signal waveforms of the photointerrupters 130a and 130b in the states of FIGS. 11a to 11c.

  When the detection rib 1104 blocks between the light emitting unit and the light receiving unit of the photo interrupters 130a and 130b (FIG. 12A), the electrical signal is LOW, and the slit 105a / between the light emitting unit and the light receiving unit of the photo interrupters 130a and 130b is detected. When the signal 105b is passing (not blocked by the detection rib 104) (FIG. 12b) is HI, at the timing when the signal of either the photo interrupter 130a or 130b is first switched from LOW to HI. By giving a control signal for stopping the turret unit 100, the turret unit 100 can be stopped every 120 degrees.

  Further, it is possible to specify the current position of the turret unit 100 in FIGS. 11a to 11c by the combination of the HI / LOW signals of the photo interrupters 1130a and 1130b.

  Finally, the overall control flow of the above-described optical units 100 and 950 will be described with reference to FIG. First, when the filter changing operation is performed by the operation unit 1402 mounted on the imaging apparatus (s1702), the control unit 1601 reads the signals of the photo interrupters (PI) 130a, 130b, 962a, and 962b and outputs the signals of the turret units 100 and 950. The current position is confirmed, and it is determined whether the turret units 100 and 950 should be rotated in the direction of α or β in FIG. 9A (s1703). Thereafter, the lock drive unit 500 for pushing up the lock parts 401 and 1009 operates (1704), and when the lock is released (s1705), the operation of the lock drive unit 500 stops (s1706), and instead the drive unit In accordance with the signal sent from the control unit 1602, 300 and 930 start to rotate either forward or reverse (s1707). Then, the turret unit 100 receives the rotation of the drive unit 300, receives the power of the drive unit 930, and the turret units 100 and 950 start rotating (s1708).

  Thereafter, when detection of the photo interrupters (PI) 130a, 130b, 962a, 962b provided in the optical unit is confirmed (s1709), the driving units 300, 930 are stopped (s1710), and the turret units 100, 950 are accordingly accompanied. Also stops (s1711). Then, the lock drive unit 500 operates again (1712). After the turret units 100 and 950 are locked by the lock components 401 and 909 (s1713), the lock drive unit 500 stops operating (s1714).

  According to the optical unit having the above configuration, the turret type optical unit was shocked by eliminating the large center of gravity deviation from the rotating shaft caused by the presence or absence of mounted components and reducing the influence of the moment. It can be prevented from rotating inadvertently.

  Next, a second embodiment will be described. As shown in FIG. 20, the second embodiment is different from the first embodiment in that a metal piece 2016 serving as a weight is attached to the turret unit 2000 instead of the lightening shape of the first embodiment. The metal piece 2016 is fixed to the turret unit 2000 by bonding or the like, for example, in an area (range R) surrounded by the outer end of the turret unit 2000 of the opening 2006 and the outer periphery of the turret unit. Since other configurations are the same as those of the first embodiment, they are omitted here.

  With the configuration as described above, the turret unit 2000 is displaced from the center point P to the point B, closer to the center axis than the point A in FIG. Thus, the moment force generated according to the shift of the center of gravity when receiving the force can be weakened, and the turret unit 2000 can be prevented from rotating in the α or β direction.

  Further, since it is not necessary to provide a hollow hole as in the first embodiment, even in the case where inconvenience occurs when light is transmitted through the opening hole, for example, this embodiment can be applied. .

  In this embodiment, the metal piece 1016 is used as the weight. However, the present invention is not limited to this, and other parts may be attached as long as the center of gravity is corrected.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

100 Turret unit 101 Turret 102 Peripheral gears 103a and 103b Sliding rib 104 Detection ribs 105a and 105b Slits 106a to 106c Openings 107a and 107b Optical filters 108a to 108d ················· Adhesive grooves 110a to 110c ··· Opening portions 111a and 111b ··· Mounting screws 112 ··· Shaft hole 114 · ······················· • Drive unit 302 Drive motor 303 Mounting plate 304 Shaft 305 Pinion gear 306 Intermediate transmission gear 307 First gear 308 Second gear 310 Terminal 401 Lock part 402 ... shaft hole 403 ... meshing part 404 ... projection 500 ... lock drive unit 502 ... lock Drive motor 503 ... Worm gear 505 ... Slide shaft 507 ... Rack 508 ... Shaft hole 509 ... Transmission part 510 ... Terminal part 512 ... Pushing surface 700 ... Front cover 701 ... Coil springs 752a to 752e · · · Gear tip 901 · · · Front cover 904a and 904b · Mounting screws 908a and 908b · Mounting boss 901 · · · Locking part 910 · · · Coil spring 914 · · · Rotating shaft 915 · · · Rotating shafts 920a and 920b 922a, 922b ... Boss 924 ... Rotating shaft 925 ... Rotating shaft 927 ... Sliding surface 928 ... Rear cover 929a to 929c ... Mounting screw 930 ... Drive unit 933 ... Mounting plate 935a, 935b ... Installation Screws 936 intermediate transmission gears 938a, 938b sliding surfaces 939a, 939b holes 940a to 940c Turret shaft 942 ... Turret shaft rear shaft 943 ... Turn hole 942 ... Turret shaft front shaft 947 ... Recess 950 ... Turlet units 951a, 951b ... Sliding ribs 955 ... Sliding surface 956 ... Transparent glass 961 ... Low pass filters 962a and 962b ... Photo interrupters 963a and 963b ... Holes 966a and 966b ... Boss 970 ... Imaging element 971 ... Sensor substrate 972 ... Sensor plate 982 ... Elastic member 983 ... Openings 984a, 984b ... Optical filter 1201 ... Light emitting part 1202 ... Light receiving part 1400 ... Imaging device 1401 ... Lens mount 1402 ... Lens 1403 ... Optical unit 1404 ... Battery compartment 1405 ... Battery Storage unit 1406... Recording unit 190 a to 1902e ... tip R-shaped part 2000 ... turret unit 2001 ... turret 2002 ... outer peripheral gear 2003 ... sliding ribs 2004 ... detection ribs 2005a, 2005b ... slits 2006 ... openings 2007a, 2007b ... Optical filters 2011a, 2011b ... Mounting screws 2016 ... Metal pieces

Claims (6)

A circle composed of a rotating shaft, a disc-shaped holding member provided with at least three openings, and a plurality of optical filters arranged to cover the opening and fixed to the holding member An optical unit having a plate unit and a support member that supports the disk unit so as to be rotatable about the rotation axis, and the center of gravity of the disk unit is eccentric with respect to the rotation axis center of the holding member The opening not covered by the optical filter and the two adjacent openings located on the opposite side across the rotation shaft and covered by the optical filter, and the outer shape of the holding member An optical unit, wherein a hollow shape is provided in an enclosed area. The optical unit according to claim 1, wherein the opening is rectangular. The said lightening shape is provided on the opposite side of the rotation shaft with respect to the direction in which the center of gravity of the disk unit is eccentric with respect to the rotation shaft center of the holding member. Item 3. The optical unit according to Item 1 or Item 2. The optical unit according to any one of claims 1 to 3, wherein the lightening shape is an opening. The optical unit according to any one of claims 1 to 4, wherein the lightening shape is a concave seat. A circle composed of a rotating shaft, a disc-shaped holding member provided with at least three openings, and a plurality of optical filters arranged to cover the opening and fixed to the holding member An optical unit having a plate unit and a support member that supports the disk unit so as to be rotatable about the rotation axis, and the center of gravity of the disk unit is eccentric with respect to the rotation axis center of the holding member And a weight member for correcting the center of gravity is provided in an area surrounded by the end of the holding member on the opening side and the outer shape of the holding member.