JP2016142772A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device that includes a high light shielding property for preventing a sensor scorch at a time of non-shooting without increasing the number of components and costs and inducing increase in size of the imaging device in the imaging device including a turret type optical unit.SOLUTION: An imaging device is provided with: an image pick-up element capturing incident light from a lens; operation means for operating an imaging device; and control means for causing driving means and position detection means to rotate and stop an optical filter at a prescribed position in accordance with the operation means. Further, the control means allows a turret to be stopped relative to a phase capable of shielding light so that at least a part of a light beam of the incident light from the lens does not reach the image pick-up element by a part other than an opening part in the turret.SELECTED DRAWING: Figure 15b

Description

  The present invention relates to an imaging apparatus including a turret type optical unit.

  In conventional imaging apparatuses, various devices have been proposed as means for preventing sensor burns caused by sunlight or the like during non-shooting. In Patent Document 1, a plurality of optical filters are mounted on a disc-shaped holding member (hereinafter referred to as a turret), and the type of optical filter is changed by rotating the turret around a rotation axis. For the imaging device equipped with, a shielding plate is added inside the turret type optical unit to prevent sunlight from entering the sensor.

JP-A-7-311352

  However, the method of Patent Document 1 requires components as a shielding plate in addition to the turret type optical unit, which increases the number of components and cost, and further increases the size of the imaging apparatus.

  The present invention provides an image pickup apparatus having a turret type optical unit, without increasing the number of parts and cost, without increasing the size of the image pickup apparatus, and with high light-shielding properties for preventing sensor burn when not shooting. An object of the present invention is to provide an image pickup apparatus.

  In order to achieve the above object, an imaging apparatus of the present invention is capable of performing a rotation operation around a rotation axis and a rotation axis around the rotation axis, and a disc-shaped turret provided with a plurality of openings. A plurality of optical filters with different optical properties arranged to cover the opening and fixed to the turret, drive means for rotating the turret, and a phase for detecting the phase of the turret An image pickup apparatus having an optical unit provided with phase detection means, wherein the image pickup apparatus further takes in incident light from a lens and forms an image, and operation means for operating the image pickup apparatus The driving means and the position detecting means according to the operating means are provided with a control means for rotating and stopping the optical filter at a predetermined position. At least a portion of the rays of incident light from the figures and characterized in that it is possible to stop the turret in the phase that can be shielded so as not to reach the image pickup device by a portion other than the opening in the turret.

  According to the imaging device having the turret type optical unit of the present invention, without increasing the number of parts and cost, without increasing the size of the imaging device, and having high light-shielding properties for preventing sensor burn when not photographing. An image pickup apparatus provided can be provided.

Exploded perspective view of turret unit Turret front view Overall view of an imaging device equipped with an optical 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 Front view of lock drive unit Side view of lock drive unit Perspective view of turret unit, lock drive unit and lock parts Front view of FIG. Rear view of FIG. The rear enlarged view of FIG. The figure which unlocked from Drawing 7a and Drawing 7b The figure which unlocked from Drawing 7a and Drawing 7b Optical unit and its peripheral exploded perspective view Optical unit and its peripheral exploded perspective view Front view showing the positional relationship during assembly of the turret unit and the drive unit Side view showing the positional relationship when assembling the turret unit and the drive unit Front view of turret unit Front view of turret unit Front view of turret unit Diagram showing relationship between photo interrupter and detection rib Diagram showing relationship between photo interrupter and detection rib Photo interrupter signal waveform diagram Schematic showing the combination of two turret units Schematic diagram when light is shielded with one turret unit Schematic diagram when light is shielded with two turret units Schematic diagram when light is shielded with two turret units Schematic diagram when light is shielded with two turret units Schematic showing the turret unit in the normal position System block diagram flowchart Front view showing the arrangement relationship of the R-shaped part of the tip of the turret unit, the lock part, and the drive part The figure showing the state where the lock parts are half-coupled to the turret unit Control flow diagram of optical units 100 and 950 in a light-shielded state

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 2 is a perspective view showing the configuration of the entire imaging apparatus equipped with the optical unit of this embodiment. 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 apparatus 200, the lens 202 can be attached to and detached from the lens mount 201. An optical unit 203 is disposed behind the lens mount 201. Reference numeral 204 denotes an operation button for operating the optical unit 1402. By pressing the operation button 204, 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 203, and a battery storage unit 205 and a recording unit 206 are provided further rearward thereof.

  Hereinafter, details of the optical unit of the present embodiment will be described. FIG. 1a is an exploded perspective view of the turret unit 100, which is a component of the optical unit. FIG. 1 b is a front view of the turret 101 that is a component of the turret unit 100.

  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 side of 103a) and the position of the turret are the sliding surfaces when rotating around the Z axis. 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 ° inside the disc-shaped 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 mounting seats for the optical filters 107a and 107b. The optical filters 107a and 107b are attached to the mounting 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 metal, which prevents the optical filters 107a and 107b from being dropped when they 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.

  Next, the structure of the drive means for rotating the turret unit 100 described above will be described. FIG. 3A is a view showing a relationship between the turret unit 100 and a driving 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 rotation or a reverse rotation by receiving a drive current and an electrical signal. In addition, by adopting a general stepping motor or the like and finely controlling the step angle, accurate positioning is possible. 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.

  Further, since the intermediate transmission gear 306 is used, the drive motor 302 can be arranged so as to overlap in the thickness direction of the turret unit 100, so that the drive motor 302 is driven in comparison 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. In addition, like the drive motor 302, a stepping motor or the like is employed to finely control the step angle and enable accurate positioning.

  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 rotates forward and backward by the lock drive motor 502, 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 7 a to 7 c show a locked state in which the gear portion 102 of the turret unit 100 is engaged with the meshing portion 403 of the lock component 401. 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 an enlarged view of a 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. 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. 7 c, the meshing portion 403 is held down in the γ direction by the biasing force of the coil spring 701 at the contact points E <b> 1 and E <b> 2 with the gear portion 102.

  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. 18 is a diagram showing how the gear range having the R shape formed at the tip, the lock part, 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. 18, 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.

  The position control of the lock drive unit 500 accompanying the lock / unlock operation described above 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 and peripheral components of the present embodiment. 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 at the time of 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 rotating shaft 914 serving as a rotating shaft of the component 401, a locking component 909 for locking the turret unit 950, and a coil spring 910 are attached, and the locking rotating shaft 915 serving as the rotating shaft of the locking component 909 is attached. The bosses 922a and 922b for fixing the 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 metal plate 933 of the drive unit 930 are also screwed. 935a, The bosses 966a and 966b for fixing with 35b and the intermediate transmission gear 936 are held, and the gear rotation shaft 938 serving as the rotation shaft of the intermediate transmission gear 936 and the shaft hole 112 of the turret unit 100 are fitted to each other. A turret rotation shaft 925 serving as a rotation shaft, 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 a 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 that is a contact surface to the sliding rib 103b of the turret unit 100, and 938b that 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 illustrated from the rear of the rear cover so as to seal the opening of the rear cover 928. Not stuck 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 of the arrangement relationship of the turret units 100 and 950, the drive units 300 and 930, and the intermediate transmission gears 306 and 936, as viewed 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 symmetrical 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. 14 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) to (4) in FIG. Switching from (1) to (2) is performed by rotating the turret unit 950 in the β direction by 120 degrees, and switching from (2) to (3) is performed by turning the turret unit 100 in the α direction by 120 degrees. By rotating 950 by 120 degrees in the β direction, switching from (3) to (4) is possible 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 operation of the turret units 100 and 950 in the light shielding state will be described with reference to FIGS. 15a to 15e. The light blocking state here is a state that prevents at least a certain amount of incident light from the subject side from entering the sensor.For example, this state may be when the power is turned off when shooting is not performed. preferable.

  First, as an example, a case where only the turret unit 100 and the sensor substrate 971 are represented and light is shielded by one turret unit 100 will be described. FIG. 15A is a perspective view showing the positional relationship between the turret unit 100 and the sensor substrate 971, and FIG. 15B is a front view of the state of FIG. 15A as viewed from the front.

  Further, 1501 in FIGS. 15a and 15b represents a sensor light receiving range. In the light-shielded state, the turret unit 100 has the normal position of the ND filter 107b as shown in FIG. 15B, that is, the center 1505 of the ND filter 107b and the center 1506 of the sensor light receiving range 1501 as shown in FIG. It stops in a state where the phase is shifted by θ1 from the position in the state where the projections coincide with each other along Z ′. At this time, a part of the light beam entering the sensor from the lens is blocked by the mask metal plate 109. For example, FIG. 15B shows a state in which a portion indicated by 1501a is shielded from light by the mask metal plate 109. In addition, regarding the light rays that cannot be shielded by the mask metal plate, the one having the higher light attenuation rate is allowed to pass through the ND filters 107a and 107b attached to the turret unit 100. That is, FIG. 15a shows the stop position when the light attenuation rate of the ND filter is 107b> 107a.

  In the above description, the front turret unit 100 has been described. However, if the rear turret unit 950 is controlled instead to stop at the same position, substantially the same effect can be obtained. .

  Next, a case where the two turret units 100 and 950 are combined to shield light will be described. FIG. 15c is a perspective view showing the positional relationship between the turret units 100 and 950 and the sensor substrate 971, and FIG. 15d is a front view of the state of FIG. 15c as viewed from the front.

  When light is shielded by two turret units 100 and 950, as shown in FIG. 15d, both turret units 100 and 950 are in their normal positions, that is, positions where the centers of the ND filters 107b and 984b are on the optical axis Z ′. Is stopped in a state where the phase is shifted by θ1 and θ2.

  By shifting the phase so that the regions where the turret units 100 and 950 shield each other are complemented as described above, a wider range of the mask sheet metal 109 and the turret unit 100 (or 950) than in the case of one sheet is obtained. 989 can block light. For example, FIG. 15d shows a state where portions indicated by 1501a and 1501b are shielded from light by the mask metal plates 109 and 989. FIG. At this time, for the light rays that cannot be shielded by the mask metal plates 109 and 959, the ND filters attached to the turret units 100 and 950 are allowed to pass the light rays having a higher attenuation rate. That is, FIG. 15d shows the stop position when the light attenuation rate of the ND filter is 107b> 107a and 984b> 984a.

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

  The control unit 1601 performs predetermined control according to an operation signal from the operation button 204 or the power button 207 of the imaging apparatus. When an operation signal is received from the operation button 204 or the power button 207 of the imaging apparatus, the lock drive unit 500 and the turret drive units 300 and 930 are started to operate, and the lock detection unit 1602 and the turret detection unit (photo interrupter). Receiving signals from 130a, 130b, 962a, 962b, the operations of the lock driving unit 500 and the turret driving units 300, 930 are stopped. 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 serving as the detection unit and the 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 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 where the detection rib 104 blocks the light of the photo interrupter 130a (130b), and FIG. 12b shows a state where the detection rib 104 does not block the light of the photo interrupter, that is, the slit 105a (105b) is the 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 signal waveforms of the photo interrupters 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. If the signal 105b is passing (not obstructed by the detection rib 104) (FIG. 12b) is HI, the signal from 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 identify 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 control flow of the above-described optical units 100 and 950 will be described. FIG. 17 is a control flow of the optical units 100 and 950 in a normal state.

  First, when a filter change operation is performed using the operation button 204 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 from 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 components 401 and 1009 is operated (1704), and when the lock is released (s1705), the operation of the lock drive unit 500 is stopped (s1706). In accordance with the signal sent from the control unit 1602, 300 and 930 start rotating in either forward rotation or reverse rotation (s 1707).

  Then, the turret unit 100 receives the rotation of the driving unit 300, receives the power of the driving unit 930, and the turret units 100 and 950 start rotating (s1708).

  Thereafter, when the 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 unit 100, The rotation of 950 is also stopped (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).

  Next, FIG. 20 is a control flow of the optical units 100 and 950 in the light shielding state.

  First, when the power button 207 is operated to turn off the power (s2002), the control unit 1601 reads the signals of the photo interrupters (PI) 130a, 130b, 962a, 962b and confirms the current positions of the turret units 100, 950. .

  Then, a combination of ND filters (107a, 984a) having the highest light attenuation rate in a light shielding state, that is, a part of the light beam is shielded by the mask metal plates 109, 989 and the mask metal plates 109, 989 cannot be shielded. In order to arrange the turret units 100 and 950 at such positions as to transmit the light, it is determined which of the forward rotation and the reverse rotation should be started (s2004).

  Thereafter, the lock drive unit 500 for pushing up the lock components 401 and 1009 operates (s2005). When the lock is released (s2006), the operation of the lock drive unit 500 stops (s2007), and instead the drive unit In accordance with the signal sent from the control unit 1602, 300 and 930 start to rotate in either forward rotation or reverse rotation (s2008).

  Then, the turret unit 100 receives the rotation of the driving unit 300, receives the power of the driving unit 930, and the turret units 100 and 950 start rotating (s2009).

  When the detection of the photo interrupters (PI) 130a, 130b, 962a, 962b provided in the optical unit is confirmed (s2010), the turret is rotated in the forward or reverse direction by a predetermined step from the location where the PI is detected. After that (s2011), the drive units 300 and 930 are stopped, and the turret is stopped at a position where the light is blocked (s2012).

  Then, the lock drive unit 500 operates again (s2013). After the turret units 100 and 950 are locked by the lock components 401 and 909 (s2014), the lock drive unit 500 stops operating (s2015).

  According to the configuration as described above, in an imaging device having a turret type optical unit, without increasing the number of parts and cost, without causing an increase in the size of the imaging device, and for preventing sensor burn when not photographing. An imaging apparatus having high light shielding properties can be provided.

  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 outer gear,
103a, 103b sliding rib, 104 detection rib, 105a, 105b slit,
106a-106c opening, 107a, 107b optical filter,
108a to 108d adhesive groove, 109 mask metal plate, 110a to 110c opening,
111a, 111b mounting screw, 112 shaft hole, 114 relief hole,
116 Mouth hole, 117 Meat hole, 120a-120c Self-tapping hole,
200 imaging device, 201 lens mount, 202 lens, 203 optical unit,
204 Battery storage unit, 205 Battery storage unit, 206 Recording unit,
207 Power button, 300 drive unit, 302 drive motor, 303 mounting sheet metal,
304 shaft, 305 pinion gear, 306 intermediate transmission gear,
307 1st stage gear, 308 2nd stage gear, 310 terminal part, 401 lock parts,
402 Shaft hole, 403 meshing portion, 404 protrusion, 500 lock drive unit,
502 lock drive motor, 503 worm gear, 505 slide shaft,
507 rack, 508 shaft hole, 509 transmission section, 510 terminal section,
512 pressing surface, 700 front cover, 701 coil spring,
752a to 752e gear tip, 901 front cover,
904a, 904b mounting screws, 908a, 908b mounting bosses,
901 Locking part, 910 Coil spring, 914 rotation axis, 915 rotation axis,
920a, 920b mounting screw, 922a, 922b boss, 924 rotation shaft,
925 Rotating shaft, 927 Sliding surface, 928 Rear cover,
929a to 929c mounting screw, 930 drive unit, 933 mounting sheet metal,
935a, 935b mounting screw, 936 intermediate transmission gear,
938a, 938b sliding surface, 939a, 939b hole, 940a-940c boss,
941 Turret shaft, 942 Rear shaft of turret shaft, 943 Shaft hole,
942 A shaft in front of the turret shaft, 947 recess, 950 turret unit,
951a, 951b sliding rib, 955 sliding surface, 956 transparent glass,
961 Low-pass filter, 962a, 962b photo interrupter,
963a, 963b hole, 966a, 966b boss, 970 image sensor,
971 sensor substrate, 972 sensor plate, 982 elastic member,
983 opening, 984a, 984b optical filter, 989 mask sheet metal,
1201 light emitting unit, 1202 sensor light receiving surface,
1501 A portion of the sensor light-receiving surface that is shielded by the mask metal plate,
1501a A portion of the sensor light-receiving surface that is shielded by the mask metal plate,
1902a to 1902e Tip R shape part

Claims (7)

A rotating shaft, a disc-shaped turret capable of rotating around the rotating shaft, and a plurality of openings provided, and arranged to cover the openings and fixed to the turret An imaging apparatus having an optical unit provided with a plurality of optical filters having different optical properties, a driving unit for rotating the turret, and a phase detection unit for detecting the phase of the turret The imaging device further captures incident light from a lens to form an image, an operating means for operating the imaging device, the driving means and the position detecting means according to the operating means, Control means for rotating and stopping the optical filter at a predetermined position is provided, and the control means causes at least a part of light rays from the lens to be incident on the light. Imaging device, wherein the through portions other than the opening it is possible to stop the turret in the phase that can be shielded so as not to reach the image pickup device in Retto. The imaging apparatus according to claim 1, wherein the optical filter fixed to the turret is a dark filter having a different light attenuation rate. The optical unit has two turrets, and the control means shields at least some of the incident light from the lens from reaching the image sensor by a portion other than the opening in the first turret. The second phase is set to a phase where at least a part of the light beam that could not be blocked by the first turret so as not to reach the imaging device can be blocked by a portion other than the opening in the second turret. The imaging apparatus according to claim 1, wherein the turret can be stopped. When the turret is stopped, the control means is a neutral density filter having the highest attenuation rate among the neutral density filters fixed to the same turret so that the light beam that could not be blocked so as not to reach the image sensor The imaging device according to any one of claims 1 to 3, wherein the turret is stopped at a phase that transmits light. The sheet metal member according to claim 1, further comprising a thin plate-like sheet metal member fixed to the turret so as to be in close contact with the optical filter and masking unnecessary external light from entering the optical filter. 5. The imaging device according to any one of 4. The imaging apparatus according to claim 1, wherein the driving unit is a stepping motor. The imaging apparatus according to claim 1, wherein the operation unit is a power button.