JP2017003605A - Light-amount adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-amount adjustment device that adjusts an opening area of a stop with a uniform amount of light kept with an attachable/detachable size only by forming a small slit in a main body device.SOLUTION: A light-amount adjustment device 10 includes a diaphragm mechanism in which an opening edge of a diaphragm is moved to thereby change an opening area and then an amount of passing light is adjusted, and the diaphragm mechanism comprises: an arm 31 that transmits drive force from a motor 11; and light shield members 32 to 35 that move due to the drive force to be transmitted by the arm, and thereby change an opening area of the diaphragm. The light shield members 32 and 33 are reciprocally moved in a linear direction, and mutual opening edges 32d and 33d get proximity or are spaced apart, and the light shield members 34 and 35 cause a movement of opening edges 34d and 35d in a crossing direction to the linear movement direction of the light shield members 32 and 33 to change the opening area of the diaphragm.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a light amount adjusting device that adjusts a diaphragm by moving a member.

  For example, an imaging device such as a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) is used in the image photographing device, and a light amount adjusting device for adjusting the light amount is mounted.

  The light quantity adjusting device is equipped with a diaphragm mechanism that adjusts the aperture area of the diaphragm. This diaphragm mechanism, for example, receives a rotational driving force of a motor (drive source) 201 by a power transmission mechanism 210 as shown in FIG. The plurality of light shielding members 220 are collectively moved so as to be transmitted (see Patent Document 1).

  The power transmission mechanism 210 is constructed by the support plate 211, the ring member 212, and the lever member 213, and is accommodated between the cover members 202 and 203 of the light amount adjusting device 200 in a state where the power transmission mechanism 210 further overlaps the light shielding member 220 that is stacked. Has been.

  In this power transmission mechanism 210, a ring member 212 is attached to a lever member 213 which is located on the cover member 203 side and rotates forward and backward by the rotational driving force of the motor 201, and the ring member 212 remains in a circular position. Thus, the lever member 213 is rotated forward and backward. Further, a support plate 211 is attached to the cover member 202 side so as not to rotate, and the support plate 211 rotatably supports one end side of the light shielding member 220 as a stationary rotation fulcrum 220a. The light shielding member 220 is connected to the ring member 212 at a connecting groove 220b in the vicinity of the rotation fulcrum 220a.

  With such a structure, the light shielding member 220 is positioned between the support plate 211 and the ring member 212 and rotated around the rotation fulcrum 220a so as to be rotated by the rotating ring member 212. The aperture area of the diaphragm is adjusted.

JP 2013-97178 A

  By the way, in such a light quantity adjusting device, it is performed to improve the quality of a captured image by attaching and detaching it to the image capturing device according to the environment of the shooting location or the imaging conditions, For example, the lens unit may be detachably mounted so as to be positioned on the front side of the image sensor of the image capturing apparatus.

  The cover members 202 and 203 of the light amount adjusting device 200 described in Patent Document 1 are wide to accommodate a circular ring member 212 having an outer diameter close to that of the constituent members of the lens unit, and the support plate 211 and The light blocking member 220 is stacked on the ring member 212 and becomes thicker in the optical axis direction. For this reason, in order to attach / detach the light amount adjusting device 200 to / from the lens unit, it is not possible to form an attaching / detaching slit on the outer peripheral surface of the lens unit, and it is necessary to disassemble it each time.

  In recent years, image capturing apparatuses have been improved in image quality, and there are cases where the influence of the shape of the aperture of the diaphragm occurs. For example, as the aperture shape of the stop becomes different from a circle, the amount of light in the aperture becomes more uneven, and this may cause image degradation particularly when the aperture area is reduced. Furthermore, when the corner (aperture angle) at the aperture edge of the stop becomes an acute angle, light is diffracted at the corner, and a so-called flare phenomenon (diffraction) occurs in which a strong light line is reflected in the photographed image. As a result, the captured image may be significantly degraded.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a light amount adjustment device that can adjust the aperture area of a diaphragm with a uniform light amount, with a detachable size by simply forming a small slit in the main body device.

  One aspect of the invention of a light amount adjusting device that solves the above problem is a light amount adjusting device that includes a diaphragm mechanism that adjusts the amount of light that passes by changing the aperture area by moving the aperture edge of the diaphragm, wherein the diaphragm mechanism Comprises a power transmission member that transmits a driving force from a driving source, and three or more light quantity adjustment members that move by the driving force transmitted by the power transmission member to change the aperture area of the diaphragm, The light quantity adjusting member is reciprocally moved on a straight line by a driving force transmitted by the power transmission member, and at least a pair of linear moving members in which the opening edges are close to or separated from each other, and the power Due to the driving force transmitted by the transmission member, the opening edge is moved in a direction intersecting the moving direction of the linear moving member, and the opening area of the diaphragm is changed together with the linear moving member. It is formed using the above cross-moving member.

  As described above, according to one aspect of the present invention, the aperture area of the diaphragm is adjusted with a uniform light amount with a detachable size by simply forming a small slit on the main body device side such as a lens unit of the image capturing device. It is possible to provide a light amount adjusting device that can handle the above.

FIG. 1 is a view showing an example of an image photographing device equipped with a light amount adjusting device according to an embodiment of the present invention, and is an external perspective view showing a schematic configuration thereof. FIG. 2 is an exploded perspective view of an image photographing apparatus equipped with a light amount adjusting device. FIG. 3 is a perspective view from above illustrating the slit on the side of the image capturing device into which the light amount adjusting device is inserted. FIG. 4 is an exploded perspective view showing components of the light amount adjusting device. FIG. 5 is a longitudinal sectional view showing the structure of the motor. 6A and 6B are views showing a state where a coil is wound around a bobbin of a motor component, where FIG. 6A is a top view, FIG. 6B is a side view, and FIG. 6C is a direction orthogonal to the side surface of FIG. FIG. 7A and 7B are diagrams showing the internal structure of the light amount adjusting device, in which FIG. 7A is a plan view when the four light-shielding members are removed and the inner surface side of the motor-side cover member is viewed, and FIG. It is a top view in the state where the shading member was attached to. 8A and 8B are diagrams showing the internal structure of the light amount adjusting device. FIG. 8A is a plan view when the inner surface side of the cover member opposite to the motor is viewed with the four light shielding members removed, and FIG. It is a top view in the state where four light shielding members were attached to (a). FIG. 9 is a diagram showing the internal structure of the light amount adjusting device, where (a) is a plan view when two rotating light shielding members are removed and the inner surface side of the motor-side cover member is viewed, and (b) is a plan view. It is a top view which shows the two light shielding members which linearly move to (a). 10A and 10B are diagrams showing an internal structure of the light amount adjusting device, and FIG. 10A is a plan view when the inner surface side of the cover member on the motor side is viewed by removing two light-shielding members that move linearly. FIG. 3A is a plan view showing two light shielding members rotating in (a). 11A and 11B are diagrams showing the aperture shape of the diaphragm of the light amount adjusting member, where FIG. 11A is a plan view showing the open state, and FIGS. 11B to 11D are diagrams showing the light-shielding member moving so as to gradually reduce the opening area. It is a top view which shows the opening shape when doing. FIG. 12 is an exploded perspective view showing a configuration when the rotating light shielding member is removed from the light amount adjusting device. 13A and 13B are diagrams showing the aperture shape of the diaphragm of the light amount adjusting member shown in FIG. 12, wherein FIG. 13A is a plan view showing the open state, and FIGS. 13B to 13D are designed to gradually reduce the aperture area. It is a top view which shows the opening shape when a light-shielding member moves. 14A and 14B are diagrams showing the support structure of the light shielding member, in which FIG. 14A is a partial cross-sectional side view when the cover member is cut at the longitudinal center passing through the rotation shaft of the motor, and FIG. It is a partial cross section side view when the cover member of an other side is cut | disconnected. FIG. 15 is a diagram showing a first other aspect of the present embodiment, and is an exploded perspective view showing components of the light amount adjusting device. FIG. 16 is a diagram showing a second other aspect of the present embodiment, and is an exploded perspective view showing components of the light amount adjusting device. It is a figure which shows one Embodiment of the light quantity adjustment apparatus of related technology, and is an exploded perspective view which shows the basic composition.

  As one aspect of the present invention, as in the above problem solving means, there is provided a light amount adjusting device including a diaphragm mechanism that adjusts the amount of light passing therethrough by changing the aperture area by moving the aperture edge of the diaphragm. The diaphragm mechanism includes a power transmission member that transmits a driving force from a driving source, and three or more light amount adjustment members that move by the driving force transmitted by the power transmission member to change the aperture area of the diaphragm. The light amount adjusting member is reciprocally moved on a straight line by a driving force transmitted by the power transmission member, and at least a pair of linear moving members in which the opening edges of each other are close to or separated from each other; Due to the driving force transmitted by the power transmission member, the opening edge is moved in a direction intersecting the moving direction of the linear moving member, and the opening area of the diaphragm is changed together with the linear moving member. One or more cross-moving member, the basic structure that is constituted by.

In addition to this basic configuration, the following configuration may be provided.
As a first other aspect, the diaphragm may be formed so as to open with a polygonal opening shape of a pentagon or more in which all opening angles on the opening side sandwiched between the opening edges are obtuse.

  In this aspect, the pair of linear moving members are reciprocated on the straight line so that the opening edges of the diaphragms are adjusted by moving the opening edges of the linear moving members close to or away from each other. The aperture area of the diaphragm is further adjusted by being close to or away from the direction intersecting the moving direction.

  At this time, since the pair of linear moving members only reciprocate on the straight line, the pair of linear moving members can reciprocate with a narrow width about the aperture diameter of the diaphragm, and the cross moving member moves from the crossing direction toward the diaphragm. So only a small range of movement can be done. As a result, the entire light-shielding member can be accommodated in a narrow width that is about the aperture diameter of the aperture while reducing the overlap of the light-shielding members, and can be constructed in a size that can be inserted into a slit having a small width.

  Further, for example, the opening edge of the cross moving member is added to the opening edges of the two sides formed for each linearly moving member, and the aperture shape of the diaphragm is made a pentagon (polygon) as in the first other aspect. Thus, the angle of the corner (opening angle) sandwiched between the opening edges can be made obtuse, and the opening area can be increased while passing through the aperture surface of the diaphragm with a uniform amount of light without causing a flare phenomenon or the like. Can be adjusted.

  As a second other aspect, the power transmission member receives a rotational force as a driving force from the driving source and extends in the opposite direction away from the rotating shaft so as to rotate forward and backward around the rotating shaft. A pair of arms, and a pair of first connecting portions that are respectively disposed at end portions of the arms and are connected to a pair of the linear moving members. The moving member may be reciprocated on a straight line in the opposite direction in accordance with forward and reverse rotation of the arm so that the opening edges facing each other approach or separate from each other.

  In this aspect, a pair of linear moving members are connected to both ends of the arm, respectively, and the arm is rotated forward and backward about the rotation axis, so that the pair of linear moving members are linear at positions adjacent to the arm. The aperture edge of the diaphragm can be moved close to or away from the top by reciprocating on the top, and the outer shape of the light amount adjusting device can be made into a longitudinal shape extending in a linear direction and easily inserted into a narrow narrow slit. The structure can be made.

  As a third other aspect, at least a pair of the light amount adjusting members are rotated about a rotation fulcrum in a direction in which the respective opening edges approach or separate from each other toward the opening center of the diaphragm. A pair of second connecting portions, each of which is disposed at an end portion of the arm, and a pair of the cross moving members are connected to each other. Each of the rotation fulcrums may be arranged so that the pair of cross-moving members is located on both sides of a virtual line connecting the pair of second connecting portions.

  In this aspect, the pair of cross moving members are rotated about the rotation fulcrum arranged on both sides across the arm, so that the pair of cross moving members are close to or spaced apart from each other toward the center of the aperture of the diaphragm. Since the arm is used in common with the linear moving member, the opening edge of the cross moving member moves only in the short direction relative to the opening edge of the linear moving member moving in the longitudinal direction. The opening area can be adjusted.

  For this reason, in addition to the linear moving member, the cross moving member can be installed in a compact shape without increasing the width of the light amount adjusting device. At this time, for example, the opening edge of the diaphragm is formed on the opening edges of the two sides of each linearly moving member so that the opening edge of the cross moving member is close to the both sides, so that the flare phenomenon is less likely to occur. Therefore, it is possible to easily form a stop having a hexagonal shape or more that is symmetrical with respect to the center line.

  As a fourth other aspect, the power transmission member and the light amount adjusting member are accommodated between a pair of cover members covering the front and back surfaces of the aperture, and restrict the moving direction of the linearly moving member. A direction regulating pin and a rotation support pin that rotatably supports the rotation fulcrum of the cross moving member may be formed directly on the inner surface of the cover member.

  In this aspect, since the direction regulating pin and the rotation support pin are formed directly on the inner surface of the cover member without interposing the member, it is thin to avoid the light amount adjusting device from becoming thick due to the stacking of the members. can do.

  As a fifth other aspect, the cross moving member is formed such that the width in the moving direction toward the opening center of the stop is less than or equal to half the opening diameter of the stop formed by the opening edge of the linear moving member. May be.

  In this aspect, it is only necessary to secure about half of the aperture diameter of the diaphragm as a space for the cross moving member to move so as to be located outside the opening edge of the linear moving member, and the width of the light amount adjusting device in the short direction is reduced. It can be accommodated up to about twice the opening diameter.

  As a sixth other aspect, each of the linear moving member and the cross moving member is supported so that the opposing surfaces of the linear moving member and the cross moving member of the light amount adjusting member are not in contact with each other. A supporting part may be formed.

  In this aspect, the linearly moving member and the crossing moving member can be moved in a non-contact state, avoiding an increase in size to unnecessarily increase the rotational force of the drive source, and improving durability. be able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 14 are diagrams for explaining an example of an image photographing device equipped with a light amount adjusting device according to an embodiment of the present invention.

  In FIG. 1, an image capturing apparatus 100 has a lens unit 70 attached to a camera electrical base 90 on which an image sensor 91 is mounted via a connecting device 80, a filter switching device 60 attached to the connecting device 80, and a lens. A light amount adjusting device 10 is attached to the unit 70.

  As shown in FIGS. 2 and 3, the lens unit 70 and the coupling device 80 are formed with slits 71 and 81 that open upward so as to intersect the optical axis X extending from the front surface side of the lens unit 70 to the image sensor 91. ing.

  In the light amount adjusting device 10 and the filter switching device 60, the main body portions 10A and 60A whose outer shapes are made in a substantially rectangular plate shape are inserted into the slits 71 and 81, and the aperture center Y of the diaphragm 10a and the filter window 60a is the optical axis. It is set so as to coincide with X. The light amount adjusting device 10 and the filter switching device 60 are detachably attached by screwing screws 73 and 83 into screw holes 72 and 82 at positions adjacent to one side of the slits 71 and 81 in the width direction. Yes.

  The screws 73 and 83 are screw holes 72 by positioning the shaft portions 73a and 83a in the U-shaped openings 75a and 85a of the fixing rods 75 and 85 on one side of the main body portions 10A and 60A exposed from the slits 71 and 81. The light quantity adjusting device 10 and the filter switching device 60 are fixed by being screwed and tightened. The light quantity adjusting device 10 is provided with a positioning rod 76 on the opposite side of the fixing rod 75 in the short direction, and by positioning a positioning pin 77 on the opposite side of the screw hole 72 of the slit 71 in the U-shaped opening 76a. It is designed to be positioned.

  The light quantity adjusting device 10 includes a diaphragm mechanism that adjusts the amount of light passing through the optical axis X by adjusting the opening area of the diaphragm 10a by the driving force of the motor (drive source) 11, and the filter switching device 60 is the same. Further, the filter 62 is slid in the vertical direction by the driving force of the motor 61, so that the filter 62 is moved between the filter window 60a and the adjacent cover members 68 and 69.

  The light amount adjusting device 10 and the filter switching device 60 change the opening shape and the opening area of the diaphragm 10a and change the type of the filter 62 in accordance with the environment of the place where the image shooting device 100 is installed, the shooting conditions, and the like. In such a case, it can be easily replaced by being pulled out from the slits 71 and 81. When there is no need to set the light amount adjusting device 10 or the filter switching device 60, a dummy (not shown) that closes the slits 71 and 81 may be inserted and fixed.

  As shown in FIG. 4, the light amount adjusting device 10 includes a pair of cover members 51 and 52 that face and face each other with respect to the optical axis X, and a light shielding member between the cover members 51 and 52. (Light amount adjusting member) A space for accommodating 32 to 35 is formed. The light amount adjusting device 10 functions as an aperture mechanism by moving the light shielding members 32 to 35 by the rotational driving force of the motor 11 installed on one end side in the cover members 51 and 52.

  As shown in FIG. 5, the motor 11 is attached to a rotating shaft 17 so that a rotor magnet (rotating body) 12 rotates integrally. The rotating shaft 17 is formed on bobbins 18 and 19 at both ends. It is inserted into the bearing holes 18a and 19a and is rotatably supported. As shown in FIG. 6, the rotor magnet 12 has a coil (electric wire) 21 wound around a hollow portion 11 s and 11 t of bobbins 18 and 19 to be sheathed together with a speed detection coil 22, and the outer side thereof is a yoke (ferromagnetic material). ), The magnetic field generated by the coils 21 of the bobbins 18 and 19 is prevented from leaking outside. With this configuration, the light quantity adjusting device 10 causes the motor 11 to be energized to effectively cause the rotor magnet 12 to generate a magnetic field generated by the coils 21 of the bobbins 18 and 19, thereby rotating the rotating shaft 17 to generate a rotational driving force. It comes to use.

  The motor 11 has an optical path area on the optical axis X that passes between opening edges 32d and 33d of light shielding members 32 and 33, which will be described later, by inserting the projecting rotary shaft 17 into the elongated hole 52b of the cover member 52. After sliding in the direction toward the opening 52a to be secured, a hook (not shown) is hooked on the lower bobbin 18 and fixed. Thereafter, the yoke 13 is externally mounted and rotated, whereby the protrusion 13a at the lower portion of the yoke 13 is inserted and fixed under the flange 52w of the cover member 52. The upper portion of the yoke 13 has a small diameter, and is structured to hold the upper bobbin 19.

  In FIG. 1, reference numeral 26 denotes a printed wiring board, and the printed wiring board 26 is connected to the image photographing apparatus 100 side via a connector 29 so that it can be easily replaced. A current for rotationally driving the rotary shaft 17 is supplied from the image capturing apparatus 100. The printed wiring board 26 is also assembled with a circuit necessary for the speed detection coil 22 and is compactly assembled on one surface side of the yoke 13. Reference numeral 14 denotes an insulating tape.

  Further, 28 is a magnet, and the magnet 28 is built in the motor 11, and the arm 31 (to be described later) is returned to the home position when the power is OFF by breaking the magnetic balance of the yoke 13. Note that the spring is not limited to the magnet 28, and for example, a spring (not shown) may be attached to the boss 31c of the arm 31 so as to apply a load that rotates in one direction.

  In the light amount adjusting device 10, an arm (power transmission member) 31 having a lever shape projecting on both sides in the orthogonal direction is integrally formed on one end side of the rotating shaft 17 of the motor 11 by joining or fitting. The arm 31 has lever-shaped end connecting pins 31a and 31b that are extended on opposite sides separated from a boss 31c that connects the rotating shaft 17 to light shielding members 32 to 35. With this configuration, the light amount adjusting device 10 transmits the rotational driving force of the motor 11 to the light shielding members 32 to 35 via the arm 31, and the opening edges 32 d and 33 d and the opening edge 34 d that are in the mutually facing positional relationship. The amount of light is adjusted by changing the aperture shape and the aperture area of the diaphragm 10a formed between the apertures 35d and 35d.

  In FIG. 1, reference numeral 39 denotes a filter. As this filter 39, for example, an ND (Neutral Density) filter or the like is appropriately attached to ensure the size of the aperture so that an optimal image can be captured. Can do.

  Specifically, in the light amount adjusting device 10, the light shielding members 32 to 35 are respectively disposed so as to be positioned around the diaphragm 10 a formed in the openings 51 a and 52 a of the cover members 51 and 52. When the face-to-face faces 35 are close to or separated from each other, a part of the peripheral edge functions as the opening edges 32d to 35d to change the opening area and the opening shape of the diaphragm 10a. Each of the light shielding members 32 to 35 is made of a deformed plate-like long member extending in the longitudinal direction so as to be movably accommodated in a space between the rectangular cover members 51 and 52.

  As shown in FIGS. 7 and 8, the light amount adjusting device 10 has the rotating shaft 17 of the motor 11 attached to the boss 31 c that is the rotation center of the arm 31 disposed on one side (one end side) of the cover members 51 and 52. The connecting pins 31a and 31b at the tip of the arm 31 receive the rotational driving force of the motor 11 and are reciprocally rotated in the forward and reverse directions. 7 (a) and 8 (a) are plan views showing a state in which the arm 31 is installed on the inner surface side of each of the cover members 51 and 52, and FIG. 7 (b) and FIG. b) is a plan view showing a state in which the light shielding members 32 to 35 are connected to the arm 31 on the inner surfaces of the cover members 51 and 52, respectively.

  In the arm 31, the connecting pins 31a and 31b at both ends extend in an oblique direction in the drawing of the elongated connecting grooves 32j and 33j and the light shielding members 34 and 35 extending in the horizontal direction of the light shielding members 32 and 33 in the drawing. The connecting holes 34j and 35j of the elongated holes are slidably inserted into the connecting grooves 34j and 35j. The light shielding members 32 to 35 are reciprocally moved in conjunction with the reciprocating rotation of the connecting pins 31a and 31b.

  As shown in FIG. 9, the light shielding members 32 and 33 are provided with connecting grooves 32j and 33j into which the connecting pins 31a and 31b of the arm 31 are inserted on one end side in the longitudinal direction. It is formed in a shape that opens in an orthogonal direction to the direction. FIG. 9A is a plan view showing a state in which only the light shielding members 32 and 33 are installed on the inner surface side of the cover member 52 and connected to the arm 31, and FIG. , 33 only.

  As a result, when the arm 31 rotates forward and backward by the rotational driving force of the motor 11 with the opening edges 32d and 33d arranged at positions separated from the arm 31 on one side, the light shielding members 32 and 33 are connected to the connecting grooves 32j and 32j, respectively. 33j can be driven and moved in the opposite direction while maintaining the connected state with the connecting pins 31a and 31b, and can be moved in the direction in which the opening edges 32d and 33d facing each other approach or separate from each other.

  The light shielding members 32 and 33 are guide grooves parallel to a straight line (longitudinal direction) connecting the optical system center Y (optical axis X) in the openings 51 a and 52 a of the cover members 51 and 52 and the center of the rotating shaft 17 of the motor 11. 32m, 32n, 33m, 33n are formed, and these guide grooves 32m, 32n, 33m, 33n are formed directly on the inner surface of the cover member 52 without interposing extra members. The pins 52s to 52v are inserted and held so as to be slidable in the parallel direction.

  As a result, the light shielding members 32 and 33 are connected to the guide grooves when the connection grooves 32j and 33j on one end side connected to the connection pins 31a and 31b move in the opposite directions in conjunction with the forward / reverse rotation of the arm 31. The direction in which 32m, 32n, 33m, and 33n move is restricted by the direction restriction pins 52s to 52v, and can slide in the linear direction while maintaining the posture parallel to the longitudinal direction. For this reason, the light shielding members 32 and 33 can make the opening edges 32d and 33d facing each other approach or separate in a stable state, and adjust the amount of light to be passed and the shape according to the opening shape and opening area of the diaphragm 10a. be able to. That is, the light shielding members 32 and 33 constitute a linear movement member, and the connection pins 31a and 31b of the arm 31 constitute a first connection part.

  Here, the light shielding members 32 and 33 are formed with opening edges 32d and 33d so as to have two sides each having an apex angle on a straight line connecting the opening center Y of the cover members 51 and 52 and the rotation shaft 17 of the arm 31. So that the opening angle (the included angle) of the apex angle between the opening edges 32d1 and 32d2 and the opening edges 33d1 and 33d2 exceeds 90 ° and is approximately 120 °. It is formed (see FIG. 11).

  On the other hand, as shown in FIG. 10, the light shielding members 34 and 35 are connected to the connection grooves 34j and 35j by using the connection pins 31a and 31b of the arm 31 in common, similarly to the light shielding members 32 and 33. The connecting grooves 34j and 35j are formed in a shape that extends in an oblique direction with respect to the longitudinal direction and opens. 10A is a plan view showing a state in which only the light shielding members 34 and 35 are installed on the inner surface side of the cover member 52 and connected to the arm 31, and FIG. 10B is the light shielding member 34. As shown in FIG. , 35 is a plan view showing only 35.

  Further, the light shielding members 34 and 35 are provided with fulcrum holes (rotating fulcrum) 34h and 35h in the vicinity of the connecting grooves 34j and 35j on one end side in the longitudinal direction, and the inner surface of the cover member 52 is provided in the fulcrum holes 34h and 35h. A fulcrum pin (rotation support pin) 52h and a direction restriction pin 52t formed directly on the shaft are inserted and supported rotatably. The fulcrum holes 34h, 35h, the fulcrum pin 52h, and the direction restricting pin 52t are respectively positioned on the upper side or the lower side across the arm 31 (so as to straddle the virtual line Li that connects the connection pins 31a, 31b of the arm 31). Has been placed. Since the direction restricting pin 52t functions as a rotation fulcrum of the light shielding member 35, like the fulcrum pin 52h, in this case, the direction restricting pin 52t will be referred to as a fulcrum pin 52t.

  Thereby, the light shielding members 34 and 35 are rotatably supported around the fulcrum pins 52h and 52t inserted into the fulcrum holes 34h and 35h when the arm 31 rotates forward and backward by the rotational driving force of the motor 11. 34j and 35j can be moved in the opposite direction while being connected to the connecting pins 31a and 31b, and can be moved in the same direction in which the facing opening edges 34d and 35d are close to or separated from each other.

  The light shielding members 34 and 35 are manufactured so as to rotate to a desired rotation angle in conjunction with the forward and reverse rotation by commonly using the connecting pins 31a and 31b of the arm 31 for moving the light shielding members 32 and 33 in the longitudinal direction. Has been.

  Specifically, the light shielding members 34 and 35 are linearly moved in a direction substantially orthogonal to the longitudinal direction (short direction) by rotating the opening edges 34d and 35d forward and backward around the fulcrum holes 34h and 35h. The shapes of the connecting grooves 34j and 35j are formed so that the diaphragm 10a has a desired opening shape and opening area when approaching or separating from each other. That is, the light shielding members 34 and 35 constitute a cross moving member, and the connecting pins 31a and 31b of the arm 31 constitute a second connecting portion together with the first connecting portion.

  The light shielding members 34 and 35 are U-shaped grooves that open so that the direction regulating pins 52s, 52u, and 52v of the cover member 52 can enter inside when the opening edges 34d and 35d are rotated in a direction away from each other. 34u and 35u are formed, respectively, so as to allow the opening edges 34d and 35d to sufficiently rotate away from the diaphragm 10a formed by the opening edges 32d and 33d of the light shielding members 32 and 33. .

  With this structure, the light amount adjusting device 10 blocks the light when the connecting pin 31b of the arm 31 rotates in the direction toward the outer side of the cover members 51 and 52 (the connecting pin 31a is the inner side) in FIGS. The opening edges 32d and 33d of the members 32 and 33 are linearly moved away from each other, and the opening edges 34d and 35d of the light shielding members 34 and 35 are also rotated and moved away from each other. Further, when the connecting pin 31b of the arm 31 rotates in the direction toward the inner side of the cover members 51 and 52 (the connecting pin 31a is the outer side), the opening edges 32d and 33d of the light shielding members 32 and 33 are close to each other. The opening edges 34d and 35d of the light shielding members 34 and 35 are also rotationally moved in directions close to each other.

  As shown in FIG. 11A, the light amount adjusting device 10 is configured such that when the connecting pin 31b of the arm 31 rotates to the maximum position in the direction toward the outer side of the cover members 51 and 52 (the connecting pin 31a is on the inner side). Further, the aperture edges 32d to 35d of the light shielding members 32 to 35 are retracted to the outside of the openings 51a and 52a of the cover members 51 and 52 so as to be fully opened, and the aperture 10a (opening) where the openings 51a and 52a are maximized. Area and opening shape).

  Although not shown in the figure, the light amount adjusting device 10 rotates when the connecting pin 31b of the arm 31 rotates to the maximum position in the direction toward the inner side of the cover members 51 and 52 (the connecting pin 31a is the outer side). The light shielding members 32 to 35 are overlapped to the inside of the opening edges 32d to 35d and are fully closed, and function as the closed diaphragm 10a (opening area and opening shape).

  Between the full opening and the full closing of the aperture stop 10a, the light amount adjusting device 10 starts from the maximum position where the connecting pin 31b of the arm 31 is closest to the outside of the cover members 51 and 52 (the connecting pin 31a is inside). The opening edges 32d to 35d of the light shielding members 32 to 35 move toward each other toward the center Y (optical axis X) of the openings 51a and 52a of the cover members 51 and 52 according to the amount of rotation rotating in the reverse direction. Is done.

  At this time, as shown in FIGS. 11 (b) to 11 (d), the light amount adjusting device 10 gradually adjusts the light amount passing through the aperture 10a by reducing the aperture area of the aperture 10a. The opening edges 32d to 35d of 32 to 35 move in the direction approaching each other, and the longitudinal direction width L1 and the short direction width L2 of the opening diameter of the diaphragm 10a maintain the same size.

  Further, the light amount adjusting device 10 moves the opening edges 32d1 and 32d2 and the opening edges 33d1 and 33d2 of the two sides where the light shielding members 32 and 33 are formed at an opening angle of about 120 ° to move closer to each other in the longitudinal direction. On the other hand, the opening edges 34d and 35d of the light shielding members 34 and 35 are close to each other from a direction substantially perpendicular to the longitudinal direction. For this reason, the light shielding members 34 and 35 maintain the state where the opening edge 34d is about the opening angle α = 120 ° with respect to the opening edges 32d1 and 33d1 of the light shielding members 32 and 33, and the opening edge 35d is the light shielding members 32 and 33. While maintaining the state of the opening angle α = 120 ° with respect to the opening edges 32d2 and 33d2, the two can approach each other.

  Therefore, the light quantity adjusting device 10 can adjust the opening area while maintaining the substantially hexagonal opening shape in which the opening edges 32d to 35d of the light shielding members 32 to 35 make the opening angle obtuse, and the opening edges 32d to 32d can be adjusted. The image sensor 91 can be irradiated with a uniform amount of light passing through the diaphragm 10a without causing a flare phenomenon at 35d.

  Here, as shown in FIG. 12, even if the light quantity adjusting device 10 does not include the light shielding members 34 and 35, the openings of the cover members 51 and 52 are provided as shown in FIGS. 13 (a) to 13 (d). From the state in which the apertures 51a and 52a function as the maximum aperture 10a (the aperture area and the aperture shape), the aperture area of the aperture 10a can be gradually reduced to adjust the amount of light passing therethrough.

  However, since the light shielding members 34 and 35 are not provided, the aperture shape of the aperture 10a formed by the opening edges 32d and 33d of the light shielding members 32 and 33 cannot be narrowed from the short direction, and the longitudinal length of the aperture 10a in the aperture diameter can be reduced. The direction width L1 has become larger than the short direction width L2. The difference between the longitudinal direction width L1 and the short direction width L2 becomes more prominent as the aperture area of the stop 10a is reduced, and the amount of light passing through the stop 10a becomes uneven. Further, as the aperture area of the diaphragm 10a becomes smaller, the aperture angles α of the aperture edges 32d1 and 33d1 and the aperture edges 32d2 and 33d2 of the light shielding members 32 and 33 become acute angles of about 60 °, and flare phenomenon is likely to occur. End up.

  Therefore, the light amount adjusting device 10 of the present embodiment can be sized in the longitudinal direction and the short direction only by installing the moving light shielding members 34 and 35 that commonly use the arm 31 in addition to the light shielding members 32 and 33. It is constructed so that the amount of light passing therethrough can be adjusted with high quality without increasing the size.

  In addition, as shown in FIG. 14A, the light amount adjusting device 10 has a guide rail (supporting portion) that is smoothly continuous with an end face top portion formed in an arch shape on the inner surface of the cover member 51 facing the light shielding member 32. ) 51r is formed to extend in parallel with the moving direction of the light shielding member 32, and the light shielding member 32 is supported in contact with the top of the guide rail 51r. In addition, a cylindrical protrusion (support portion) 51 f having a hole for inserting the direction regulating pin 52 t on the cover member 52 side is formed on the inner surface of the cover member 51 facing the guide groove 32 m of the light shielding member 32, and faces the light shielding member 33. A cylindrical protrusion (supporting portion) 51g having a hole into which the direction regulating pins 52s, 52u, 52v on the cover member 52 side are inserted is formed on the inner surface of the cover member 51. These cylindrical protrusions 51f and 51g are different in height and are supported so that the opposing surfaces of the light shielding members 32 and 33 are not in contact with each other. For this reason, since the light shielding members 32 and 33 are generally anti-reflective on the surface, the surface accuracy of the surface is rough and the sliding load increases, but the guide rail 51r and the cylindrical protrusions 51f and 51g At the same time, the contact load between the light shielding members 32 and 33 is also reduced.

  Similarly, as shown in FIG. 14B, the light quantity adjusting device 10 has a guide rail 52r1 that is smoothly continuous with an end face top portion formed in an arch shape on the inner surface of the cover member 52 facing the light shielding members 34 and 35. , 52r2 are extended so as to follow the rotational movement direction of the light shielding members 34, 35, and the light shielding members 34, 35 are in contact with and supported by the tops of the guide rails 52r1, 52r2. For this reason, the light shielding members 34 and 35 are similarly reduced by making the contact load with the guide rails 52r1 and 52r2 only the top, and at the same time, the contact between the light shielding members 34 and 35 is also reduced.

  Furthermore, in addition to the guide rails 51r, 52r1, and 52r2 and the cylindrical protrusions 51f and 51g functioning as support parts, the light amount adjusting device 10 has a large diameter around the direction regulating pins 52s to 52v and the fulcrum pins 52h and 52t. By forming the step portion (support portion) D and forming the step, the step portions D are supported so that the light shielding members 32 to 35 do not contact each other. The step portion D is not limited to this, and although not shown in the drawings, the step portion D protrudes from the inside of the side surface portion formed around the cover member 52 into which the cover member 51 is fitted inside. The light shielding member 32 may be formed in a shape, and may be supported so that the light shielding member 32 does not contact the light shielding member 35 by the protruding shape.

  As described above, in the light amount adjusting device 10 of the present embodiment, the opening edges 32d and 33d of the light shielding members 32 and 33 are reciprocated (closed or separated) in the linear direction to adjust the opening area of the diaphragm 10a. The members 32 and 33 can be formed to have a narrow width about the opening diameter of the diaphragm 10a. In addition to the light shielding members 32 and 33, the light quantity adjusting device 10 moves the aperture edges 34d and 35d of the light shielding members 34 and 35 toward the center of the opening in the same direction, which is close to or away from the substantially orthogonal direction. The opening area and the opening shape can be adjusted. At this time, the light shielding members 34 and 35 are formed to have a width of about half or less of the maximum aperture diameter of the diaphragm 10a, and only need to be moved within a small range that intersects the linear reciprocation of the light shielding members 32 and 33. Further, the light shielding members 32 to 35 have a small overlapping area, and the opening area of the diaphragm 10a and the like can be adjusted with only four sheets without overlapping extra members.

  For this reason, the main body 10A of the light amount adjusting device 10 can be constructed with a thin structure while narrowing the width of the cover members 51 and 52, and is inserted into the slit 71 having a small width and thickness of the lens unit 70. Can do.

  The light quantity adjusting device 10 is configured so that the opening edges 34d and 35d of the light shielding members 34 and 35 are close to the opening edges 32d1, 32d2, 33d1 and 33d2 of the two sides of the light shielding members 32 and 33, respectively. Therefore, it is possible to adjust the aperture area while maintaining the shape of the diaphragm 10a in a substantially regular hexagon (may be pentagon, heptagon, octagon or more). Specifically, the opening angle α between the opening edges 32d1 and 32d2 of the light shielding member 32 and the opening edge 34d of the light shielding member 34 and between the opening edges 33d1 and 33d2 and the opening edge 35d of the light shielding member 35 is 120 °. The opening area of the diaphragm 10a can be adjusted while the obtuse angle is at a level (an angle exceeding at least 90 °).

  Therefore, it is possible to avoid the formation of an opening edge (opening angle) that causes a flare phenomenon in the diaphragm 10a, and the imaging element 91 is irradiated with a uniform amount of light passing through the opening surface of the diaphragm 10a. Can do.

  Further, since the light shielding members 32 to 35 are supported by the guide rails 51r, 52r1, 52r2 and the cylindrical protrusions 51f, 51g so as not to contact each other, durability can be ensured. The compact and lightweight motor 11 can be employed without the need to unnecessarily increase the rotational driving force.

  Specifically, since this type of light amount adjusting device is often set to an overall thickness of 2.0 mm, a structure such as that shown in FIG. The part to be inserted into the slit 71 becomes larger than 2.0 mm and is difficult to adopt. In the light amount adjusting device 10 of this embodiment, since only the light shielding members 34 and 35 are added, the thickness of the main body portion 10A can be reduced to 2.0 mm or less. As the number of pixels increases, the device can be made thinner.

  As another aspect of the present embodiment, the motor 11 in the present embodiment may be replaced with another drive type motor. For example, as shown in FIG. 15, a circular stepping motor 111 is screwed to a connecting member 112 fixed to the cover member 52, and the rotational driving force of the stepping motor 111 is transmitted to the reduction gear 113 to correct the arm 31. You may make it reversely rotate. In addition, as shown in FIG. 16, a box-type stepping motor 121 may be attached to the cover member 52 with a fastening plate 125, and the arm 31 may be directly rotated in the forward and reverse directions by the rotational driving force of the stepping motor 121. Needless to say, the same effects as those of the above-described embodiment can be obtained in these cases.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 10 Light quantity adjustment apparatus 10A Main part 11 Motor 17 Rotating shaft 29 Connector 31 Arm 31a, 31b Connection pin 32-35 Light shielding member 32d-35d Opening edge 32j-35j Connection groove 32m, 32n, 33m, 33n Guide groove 34h, 35h 51, 52 Cover members 51f, 51g Cylindrical protrusions 51r, 52r1, 52r2 Guide rail 52h Supporting pins 52s-52v Direction restricting pins 60 Filter switching device 70 Lens unit 71, 81 Slit 80 Connecting device 90 Camera electrical base 91 Imaging element 100 Image capturing Device D Stepped portion Li Virtual line L1 Longitudinal direction width L2 Short direction width X Optical axis Y Aperture center α Aperture angle

Claims (7)

A light amount adjusting device including a diaphragm mechanism that adjusts the amount of light that passes by changing the opening area by moving the opening edge of the diaphragm,
The diaphragm mechanism includes a power transmission member that transmits a driving force from a driving source, and three or more light amount adjustment members that move by the driving force transmitted by the power transmission member to change the aperture area of the diaphragm. prepare for,
The light quantity adjusting member is reciprocally moved on a straight line by a driving force transmitted by the power transmission member, and at least a pair of linear moving members in which the opening edges are close to or separated from each other, and the power One or more cross movements in which the opening edge is moved in a direction intersecting the moving direction of the linear moving member by the driving force transmitted by the transmission member, and the opening area of the diaphragm is changed together with the linear moving member. And a light amount adjusting device.   The light amount adjusting device according to claim 1, wherein the diaphragm is opened with a polygonal opening shape of a pentagon or more in which all opening angles on the opening side sandwiched between the opening edges are obtuse angles. The power transmission member receives a rotational force as a driving force from the driving source, and a pair of arms extended in opposite directions separated from the rotating shaft so as to rotate forward and reverse about the rotating shaft, A pair of first connecting portions that are respectively arranged at the ends and to which each of the pair of linear moving members is connected;
The pair of linear moving members are reciprocated on the straight lines in opposite directions in accordance with forward and reverse rotations of the arms, and the opening edges facing each other approach or separate from each other. 2. The light quantity adjusting device according to 2. The light quantity adjusting member is a pair of at least one pair that is moved by rotating about a rotation fulcrum in a direction in which the opening edges of the diaphragms approach or separate from each other toward the opening center of the diaphragm. With
The power transmission member includes a pair of second connecting portions that are respectively disposed at end portions of the arms and are connected to a pair of the cross moving members.
4. The light amount adjusting device according to claim 3, wherein each of the rotation fulcrums is disposed so that a pair of the cross moving members are located on both sides of an imaginary line connecting the pair of second connecting portions. The power transmission member and the light amount adjusting member are accommodated between a pair of cover members covering the front and back of the aperture opening,
The direction regulating pin that regulates the moving direction of the linearly moving member and the rotation support pin that rotatably supports the rotation fulcrum of the cross moving member are formed directly on the inner surface of the cover member. The light quantity adjusting device according to claim 4.   The width of the cross moving member in the moving direction toward the opening center of the stop is formed to be less than or equal to half of the opening diameter of the stop formed by the opening edge of the linear moving member. The light quantity adjusting device according to any one of the above. A support portion for supporting each of the linear movement member and the cross movement member is formed so that the opposing surfaces of the linear movement member and the cross movement member of the light amount adjustment member are in a non-contact state. The light quantity adjusting device according to any one of claims 1 to 6.

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