JP2005157162A - Iris device for controlling light of light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an iris device for controlling light of a light source which can always obtain a rectangular iris aperture and is advantageous to cost reduction and space utilization. <P>SOLUTION: A 1st iris blade is constituted of two arms 19, 20 and two blades 21, 22 pivoted by these arms 19, 20 and a 2nd iris blade is constituted of two arms 23, 24 and one blade 25. A 1st operation member 10 is reciprocally rotated by an output pin 12a of a motor, the arm 19 is rotated by a pin 10b and a 2nd operation member 11 is rotated by engagement of gear parts 10a, 11a. The 2nd operation member rotates the arm 23 by the pin 11b. Thereby the 1st iris blade and the 2nd iris blade are driven in opposite directions by the rotation of the motor and a rectangular iris aperture of different size can be always controlled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a diaphragm device used for a projector or a projector.

  Various projectors equipped with a liquid crystal panel, DMD (digital micromirror device), etc., and using film, etc., change the amount of illumination light from the light source according to the brightness of the projected room, or project anything. In order not to change the amount of light emitted from the light source itself to temporarily weaken the amount of light when it is not, a diaphragm device is arranged in the optical path of the light source light to change the optical path area. There is. In particular, in the case of a liquid crystal projector, it is known that deterioration of the liquid crystal panel can be prevented by using such an aperture device (see Patent Document 1). Also, in the case of a diaphragm device used in a liquid crystal projector, the aperture position of the optical path is not changed around the center position when fully opened. However, there are also known ones that deviate from the center position when fully opened (see Patent Document 2).

Further, in an overhead projector using a variable magnification optical system as a projection optical system, in order to obtain a projection image at a high magnification, a diaphragm device is arranged between the stage on which the document is placed and the light source, and the projection optical system An apparatus in which the area of the optical path opening is changed in conjunction with the zooming operation of the system is known (see Patent Document 3). Furthermore, in a projector used for lighting in a stage or a studio, an aperture device is arranged in the vicinity of the light source in order to regulate the projection range and shape of the light emitted from the light source. Is known (see Patent Document 4).
JP 2001-174910 A JP 2001-13581 A JP-A-8-227102 JP-A-7-99002

  The present invention relates to a diaphragm device that can be used in the projector and the light projector as described above, and relates to a diaphragm device that controls the shape of a diaphragm aperture in a square shape. By the way, in the case of such a type of diaphragm device, it is necessary to provide at least two diaphragm blades having a straight opening regulating edge so that the diaphragm blades can be reciprocated in different directions. Therefore, the diaphragm device described in Patent Document 3 (hereinafter referred to as the conventional example) also includes two L-shaped diaphragm blades (diaphragm frames 44A and 44B) each having two opening restriction edges. These are actuated relatively along the diagonal line of the rectangular opening (window 42) opened in the base plate (base 40).

  In this conventional example, the two diaphragm blades are operated by separate motors. However, having to prepare the number of motors by the number of diaphragm blades is extremely problematic in terms of cost. In the case of a large projector such as an overhead projector, it is not regarded as a problem relatively. However, when a plurality of motors are provided, the arrangement in the projector is restricted, and moreover, a liquid crystal projector, In the case of a projector that requires portability, such as a projector using DMD, it is extremely problematic in terms of miniaturization and weight reduction. Further, in the conventional example, a space for storing the diaphragm blades (diaphragm frames 44A and 44B) is required on all four sides of the opening (window 42), and the diaphragm blades are made to be able to control a small diaphragm opening. If the (diaphragm frames 44A, 44B) is increased, the storage space is increased.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a diaphragm device that includes two diaphragm blades and controls a rectangular diaphragm opening by a driving unit. When one diaphragm blade is operated, the other diaphragm blade is simultaneously operated in conjunction with it, and the storage space for the diaphragm blade when the opening formed in the base plate is fully opened is reduced. An aperture device for adjusting light source light.

  In order to achieve the above object, the light source light adjusting diaphragm device of the present invention has a rectangular optical path opening, which forms a vane chamber between the two, and one of them is on the light source side. Both the two ground plates, both of which are disposed in the blade chamber, each of which is rotatable at one end relative to one of the ground plates in the lateral region of the opening. A first diaphragm blade and a second diaphragm blade, each of which is composed of at least one blade pivotally supported by the shaft, and attached to one of the main plates and reciprocally rotated by a driving means. A first operating member that moves the first diaphragm blade back and forth to the opening by reciprocating one of them and a rotation of the first operating member that is attached to one of the main plates and transmitted by the transmission means. Actuator To As and a second actuating member for advancing and retreating the second diaphragm blade one is reciprocating the arm of the is rotated in opposite direction the second diaphragm blade in the opening and.

  In the above configuration, the second actuating member is not provided, and the transmission means transmits one rotation of the arm of the first diaphragm blade to one of the arms of the second diaphragm blade. One of the arms of the second diaphragm blade may be rotated in a direction opposite to one of the arms of the first diaphragm blade, or the first operating member and the second operating member are not provided, The driving means directly reciprocates one of the arms of the first diaphragm blade, and the transmission means transmits one rotation of the arm of the first diaphragm blade to one of the arms of the second diaphragm blade; One arm of the second diaphragm blade may be rotated in a direction opposite to one of the arms of the first diaphragm blade.

  In such an aperture device for adjusting light source light, the transmission means may be configured to rotate the arm of the second aperture blade at a different rotation ratio than the arm of the first aperture blade. The drive means may be an electromagnetic drive device. And the electromagnetic drive device in that case may be comprised with the motor and the reduction gear mechanism.

  Further, in each of the light source light adjusting diaphragm devices as described above, the transmission means is engaged with the gear portion formed on the first operating member and the gear portion formed on the second operating member. Or a gear part formed on one of the arms of the first diaphragm blade and a gear formed on one of the arms of the second diaphragm blade and meshed with the gear part of the first diaphragm blade It may be made up of parts. Further, the transmission means may be a fitting configuration with a pin provided on one of the first operating member and the second operating member and a long hole provided on the other, or an arm of the first diaphragm blade. You may make it be a fitting structure by the pin provided in any one of the arm of one side and the said 2nd aperture blade, and the long hole provided in the other. Further, the transmission means has a link configuration in which one end of a link member is rotatably attached to the first operating member, or the other end of the link member is rotatably attached to the second operating member, One end of the link member may be rotatably attached to one of the arms, and the other end of the link member may be rotatably attached to one of the arms of the second diaphragm blade.

  The aperture device for adjusting light source light according to the present invention is an aperture device capable of operating two aperture blades in opposite directions and controlling so that aperture apertures having different optical path areas are always square. Since the diaphragm blades can be operated by a single drive means, the operation is very simple when operating manually, and when operating using an electromagnetic drive, only one electromagnetic drive is required. This is advantageous in terms of cost and space. Further, the two diaphragm blades of the present invention are each composed of two arms and at least one blade, and are a kind of parallel link mechanism. Therefore, when incorporated in a projector or the like, one side of the rectangular opening portion The space on the tip side of the aperture blade can be used effectively. Furthermore, if a plurality of blades are used for each diaphragm blade, the storage space for them can be reduced, resulting in a compact configuration, which is advantageous for controlling a small aperture opening. Also become.

  Embodiments of the present invention will be described with reference to three illustrated examples. 1 to 4 are for explaining the first embodiment. FIG. 1 is a front view showing the fully opened state of the optical path opening, and FIG. 2 is a cross-sectional view of the main part of FIG. 3 is a rear view of FIG. 1, and FIG. 4 is a front view showing a narrowed state of the optical path opening. 5 and 6 are diagrams for explaining the second embodiment. FIG. 5 is a front view showing a narrowed state of the optical path opening, and FIG. 6 is a cross-sectional view of the main part of FIG. is there. Further, FIG. 7 is a front view for explaining the third embodiment and showing a narrowed state of the optical path opening.

  First, the configuration of this embodiment will be described. The first ground plane 1 and the second ground plane 2 have substantially the same shape, the positions of the rectangular openings 1a and 2a for the optical path are aligned, and are attached to each other with a predetermined interval therebetween. 2 constitutes a blade chamber of two diaphragm blades to be described later. The ground plates 1 and 2 are arranged inside the projector and the light projecting device with the second ground plate 2 facing the light source in order to protect a motor described later from heat.

  Here, how to attach both will be described with reference to FIGS. The first ground plate 1 is provided with shafts 1b and 1c which are not clearly shown, but an annular groove is formed in the vicinity of the tip of the first ground plate 1 over the entire circumference. On the other hand, the second base plate 2 is formed with two holes 2b and 2c which are formed by connecting large and small openings into a keyhole shape. Therefore, first, when the ends of the shafts 1b and 1c are fitted to the large opening portions of the two holes 2b and 2c and the second ground plane 2 is moved to the left, the small opening portions of the two holes 2b and 2c are obtained. The edge of this bites into the grooves formed in the shafts 1b and 1c. After that, the second ground plate 2 is screwed to the first ground plate 1 with the four screws 3.

  As shown in FIG. 1, the motor mounting plate 4 is mounted on the surface side of the first ground plate 1 with four screws 5 at a predetermined interval. The motor mounting plate 4 has two bent portions 4 a and 4 b, and a printed wiring board 7 is attached to them by two screws 6. Further, two sensors 8 and 9 are attached to the printed wiring board 7. These sensors 8 and 9 are so-called photo-interrupters, and emit an L signal when the optical path between the light emitting unit and the light receiving unit is interrupted, and an H signal when the interrupted state is released. It is like that. Although these sensors 8 and 9 are arrange | positioned in a blade chamber, the arrangement | positioning state of the sensor 8 of them is shown by FIG.

  A first operating member 10 and a second operating member 11 are disposed between the first base plate 1 and the motor mounting plate 4. First, the first actuating member 10 has a gear portion 10a, an unsigned hole, and a pin 10b, and an upright shaft 10c. As shown in FIG. 2, the shaft 10 c is rotatably fitted in the hole of the first base plate 1, and its tip is rotatably fitted in the hole 2 d of the second ground plate 2. ing. Further, the pin 10b is inserted into the blade chamber through an arc-shaped long hole 1d formed in the first base plate 1. On the other hand, the second actuating member 11 also has a gear portion 11a and a pin 11b, and has a shaft 11c upright, but the first actuating member 10 has a hole not marked with the above symbol. Corresponding holes are not formed. The shaft 11c is rotatably fitted in the hole of the first ground plate 1 in the same manner as the shaft 10c described above, and its tip is rotatably fitted in the hole 2e of the second ground plate 2. At the same time, the gear portion 11a is engaged with the gear portion 10a, and is rotated by the same rotation angle in a direction opposite to that of the first operating member. Further, the pin 11b is inserted into the blade chamber through an arc-shaped long hole (not shown) formed in the first ground plane 1 such as the long hole 1d.

  A motor is attached to the motor mounting plate 4. This motor is a current control type motor called a moving magnet type motor or the like, and the permanent magnet rotor reciprocates only within a predetermined angle range in accordance with the energization direction to the stator coil. It is a rotating motor. Also in this type of motor, various types of motors are known depending on the difference in the configuration of the stator, but the motor used in this embodiment is of the most well-known type. Therefore, although it is not necessary to explain again, it will be briefly described mainly with reference to FIG. In FIG. 2, for easy understanding of the configuration, only the cross section of the motor is shown as viewed from the substantially right direction in FIG. 1, but the configuration of the mounting portion with respect to the motor mounting plate 4 is shown in FIG. It is shown in a manner that does not match 1.

  The rotor 12 is supported by a first stator frame 13 having a cup-like shape and a second stator frame 14 having a substantially flat plate shape. It winds so that the bearing part of the stator frames 13 and 14 may be enclosed, and the cylindrical yoke 16 is fitted by the outer side. Further, the output pin 12 a of the rotor 12 passes through an arc-shaped long hole 14 a formed in the second stator frame 14. The motor is attached by screws 17 and 18 with two holes formed in the second stator frame 14 fitted to the positioning pins 4c and 4d of the motor mounting plate 4. Further, the rotor 12 is made of a permanent magnet, but the rotation shaft is made of synthetic resin, and the output pin 12 a formed so as to be parallel to the rotation shaft is formed on the motor mounting plate 4. The arc-like long hole 4e is inserted into the hole of the first actuating member 10 that is not labeled. Furthermore, the arrangement position of the rotating shaft of the rotor 12 overlaps with the position of the shaft 10 c of the first operating member 10. For this reason, the first actuating member 10 rotates together with the rotor 12 at the same angle in the same direction at the same time.

  Next, the configuration of the first diaphragm blade and the second diaphragm blade arranged in the blade chamber will be described. The first aperture blade is composed of two arms 19 and 20 and two blades 21 and 22. Among them, the arm 19 has a hole formed at one end thereof rotatably fitted to the shaft 10 c of the first actuating member 10, and the arm 20 has a hole formed at one end thereof formed by the first base plate 1. It is made to fit in the shaft 1e erected so that it can rotate. The arm 19 has a hole in which the pin 10b of the first operating member 10 is fitted. Therefore, this arm 19 rotates with the rotor 12 and the first actuating member 10 simultaneously in the same direction at the same rotation angle. Further, the arm 19 is formed with a light shielding part 19 a having a slit, and the light shielding part 19 a is inserted between the light emitting part and the light receiving part of the sensor 8. Further, the two blades 21 and 22 are arranged with the blade 21 facing the first ground plane 1 side, and both of them are pivotable with respect to both the arms 19 and 20 by a connecting shaft member. It is supported.

  On the other hand, the second diaphragm blade is composed of two arms 23 and 24 and one blade 25. The arm 23 has a hole formed at one end thereof rotatably fitted to the shaft 11 c of the second actuating member 11, and the arm 24 has a hole formed at one end thereof standing on the first ground plane 1. The shaft 1f provided is rotatably fitted. Further, a hole is formed in the arm 23, and the pin 11b of the second operating member 11 is fitted therein. Therefore, this arm 23 is configured to rotate simultaneously with the second operating member 11 in the same direction at the same rotation angle. Further, the arm 23 is formed with a light shielding part 23 a having a slit, and the light shielding part 23 a is inserted between the light emitting part and the light receiving part of the sensor 9. Further, the blade 25 is pivotally supported by both of the arms 23 and 24 by a connecting shaft member.

  Next, the operation of this embodiment will be described. FIG. 1 shows a state in which the opening 1a (2a) is fully opened and the opening area of the optical path is maximized. At this time, the coil 15 of the motor is in a non-energized state, but as is well known in this type of motor, a magnetic member (not shown) provided on the first stator frame 13 and the rotor The rotor 12 is given a force that rotates in the clockwise direction by the attractive force acting between the 12 permanent magnets, but the rotation is blocked by a stopper (not shown), and this rotational position is changed. To keep. Therefore, the first operating member 10 and the first diaphragm blade can also maintain this state, and thereby the second operating member 11 and the second diaphragm blade also maintain this state.

  In this state, when it is desired to reduce the amount of illumination light from the light source, a positive current is supplied to the coil 15 of the motor. As a result, the rotor 12 rotates counterclockwise in FIG. 1 and rotates the first operating member 10 counterclockwise, so that the second operating member 11 passes through the transmission means including the gear portions 10a and 11a. And rotated clockwise. Accordingly, the arm 19 of the first diaphragm blade and the arm 23 of the second diaphragm blade are rotated in opposite directions, the blades 21 and 22 are moved downward, the blade 25 is moved upward, and the openings 1a are respectively moved. Let's enter. At this time, since the two blades 19 and 20 of the first diaphragm blades have their pivotal positions different in the length direction of the arms 19 and 20, the two blades 19 and 20 move while reducing the mutual overlap. Will go.

  Thereafter, when the blades 19 and 20 and the blade 25 move to a predetermined position, the blades are stopped by a stopper (not shown), and the narrowed state shown in FIG. 4 is obtained. FIG. 4 shows a state in which the motor mounting plate 4 is detached from the first ground plate 1, but only the motor output pin 12 b and the sensors 8 and 9 are shown. In this manner, when the narrowed state shown in FIG. However, even if the current is cut off in this way, the first diaphragm blade and the second diaphragm blade are reliably maintained in this state. The reason is that in this state, the rotor is caused by the attractive force acting between the magnetic member (not shown) provided on the first stator frame 13 and the permanent magnet of the rotor 12. This is because 12 is given a force that rotates counterclockwise.

  When returning from the state of FIG. 4 to the state of FIG. 1, a current is supplied to the motor coil 15 in the opposite direction to the above. Thereby, the rotor 12 rotates in the clockwise direction, and in FIG. 4, the first operating member 10 is rotated in the clockwise direction, so that the second operating member 11 is rotated in the counterclockwise direction. Therefore, the arm 19 and the arm 23 are rotated in opposite directions, the blades 21 and 22 are moved upward, and the blade 25 is moved downward to retract from the opening 1a. At this time, the two blades 21 and 22 of the first aperture blade move while increasing the mutual overlap. After that, when the blades 21 and 22 and the blades 25 fully open the opening 1a, the blades are stopped by a stopper (not shown). After the stop, when the power to the coil 15 is cut off, the state shown in FIG. Become.

  Here, the roles of the sensors 8 and 9 will be described. In the state of FIG. 1, the sensor 8 is shielded in its optical path by the light shielding part 19 a of the arm 19 and emits an L signal. In the case of the sensor 9, the slit formed in the light shielding part 23 a of the arm 23 is provided. It is in the optical path and emits an H signal. In the state of FIG. 4, conversely, the sensor 8 has a slit formed in the light shielding portion 19 a in the optical path and emits an H signal, and the sensor 9 is shielded by the light shielding portion 23 a of the arm 23. And the L signal is emitted. Thus, in the fully open state of the opening 1a, the sensor 8 emits an L signal and the sensor 9 emits an H signal. In the narrowed state, the sensor 8 emits an H signal and the sensor 9 outputs an L signal. Therefore, it is possible to know the state of the diaphragm blades currently in the projector or the like by using these signals. Also, for example, if the H signal is not emitted from the sensor 8 and the L signal is not emitted from the sensor 9 even though the motor is turned to the narrowed-down state, there is some trouble on the circuit or the mechanism. It is also possible to know that has occurred. This also applies to the second and third embodiments described later.

  Thus, in the case of the present embodiment, the first operating member 10 is rotated by the rotation of the rotor 12, and the arm 19 of the first aperture blade is rotated by the first operating member 10. Further, the rotation of the first operating member 10 is transmitted to the second operating member 11 by the transmission means including the gear portions 10a and 11a, and the second operating member 11 rotates the arm 23 of the second diaphragm blade. However, the present invention is not limited to such a configuration. That is, the rotor 12 may be configured not to rotate the first operating member 10 but to rotate the second operating member 11. Also, the gear portions corresponding to the gear portions 10a and 11a may be formed directly on the arms 19 and 23 and meshed with each other. In such a configuration, the second actuating member 11 is unnecessary, but it goes without saying that the rotation shaft of the arm 23 must be provided on the first base plate 1. In addition, when the gear portions are formed in the arms 19 and 23 and meshed with each other, the output pin 12b of the rotor 12 is directly fitted in the hole provided in the arm 19, The first actuating member 10 can also be dispensed with.

  Next, Example 2 will be described with reference to FIGS. FIG. 5 shows a narrowed-down state similar to FIG. 4 described above, and the same reference numerals are given to substantially the same members and parts as those of the first embodiment. Therefore, only the differences from the configuration of the first embodiment will be described. Also in this embodiment, the driving means is a moving magnet type motor having the same configuration as in the first embodiment, but FIG. 5 shows a state in which the motor mounting plate 4 is removed as in FIG. It is shown by. Therefore, in FIG. 5, only the rotor 12 (two-dot chain line) and its output pin 12a are shown. Further, as can be seen from FIG. 5, in the case of this embodiment, the first operating member 10 and the second operating member 11 as described above are arranged between the first base plate 1 and the motor mounting plate 4. It has not been. The output pin 12a passes through the arc-shaped elongated hole 1g formed in the first ground plate 1, and is rotatably fitted in the hole formed in the arm 23 of the second diaphragm blade in the blade chamber. Yes.

  The first diaphragm blade arm 19 and the second diaphragm blade arm 23 arranged in the blade chamber have different shapes from those in the first embodiment, and both are different from those in the first embodiment. They are connected by means of the transmission means. That is, the arm 19 is rotatably attached to a shaft 1h provided on the first base plate 1, and forms an overhanging portion 19b in addition to the light shielding portion 19a, and has a long hole 19c therein. . Further, the arm 23 is rotatably attached to the shaft 1i provided on the first ground plate 1. The arm 23 is formed with an overhanging portion 23b in addition to the light shielding portion 23a, and a pin 23c is provided therefor, The long hole 19c is fitted. FIG. 6 shows a specific connection configuration between the long hole 19c and the pin 23c. That is, one end of the pin 23c is crimped to the overhanging portion 23b, the long hole 19c is fitted therein, the plain washer 26 is fitted from above, and finally, in the vicinity of the tip of the pin 23c. A retaining ring (E-ring) 27 is fitted in an annular groove formed over the entire circumference.

  Next, the operation of the present embodiment will be described, but the points overlapping with the operation description of the first embodiment will be described in a simplified manner. FIG. 5 shows a narrowed state. At this time, the coil 15 of the motor is in a non-energized state, but this state is maintained depending on the configuration of the motor. In this state, when it is desired to increase the amount of illumination light from the light source, a reverse current is supplied to the coil 15 of the motor. Accordingly, the rotor 12 rotates counterclockwise in FIG. 5 and rotates the arm 23 of the second aperture blade counterclockwise. The arm 19 and the arm 23 are connected by the long hole 19c and the pin 23c. Therefore, the arm 23 rotates the arm 19 in the clockwise direction. Therefore, the arm 19 and the arm 23 rotate in opposite directions, the blades 21 and 22 are moved upward, and the blade 25 is moved downward to retract from the opening 1a. Thereafter, when the opening 1a is fully opened, it is stopped by a stopper (not shown), and the power supply to the coil 15 is cut off. Further, in order to change from such a fully opened state to the narrowed state shown in FIG. 5, a current in the forward direction is supplied to the coil 15, but the operation in that case is the reverse of the above case. The description will be omitted.

  Thus, in the case of the present embodiment, the second diaphragm blade arm 23 is directly rotated by the rotation of the rotor 12. Further, the rotation of the arm 23 is transmitted to the arm 19 by the connection configuration of the long hole 19c and the pin 23c. However, the present invention is not limited to such a configuration. That is, a long hole corresponding to the long hole 19c may be formed in the arm 23, and a pin corresponding to the pin 23c may be provided in the arm 19. Further, the rotor 12 may be configured not to rotate the arm 23 but to rotate the arm 19. In the case of the present embodiment, the rotor 12 directly rotates the arm 23, but the second operating member 11 in the first embodiment which does not have the gear portion 11a is provided, and the second It does not matter if it is rotated via the actuating member 11. Further, as in the first embodiment, the first operating member 10 and the second operating member 11 are provided, and instead of the gear portions 10a and 11a, a long hole corresponding to the long hole 19c is formed in one of them. In addition, a pin corresponding to the pin 23c may be provided on the other side.

  Next, Example 3 will be described with reference to FIG. FIG. 7 shows a narrowed-down state similar to FIG. 4, and the same reference numerals are given to substantially the same members and parts as those of the first embodiment. Therefore, only the differences from the configuration of the first embodiment will be described. Also in the case of the present embodiment, the driving means is a moving magnet type motor having the same configuration as in the case of the first embodiment, but FIG. 7 shows the state in which the motor mounting plate 4 is removed. The components of the motor are not shown. Further, in the case of the present embodiment, the first operating member 10 in the first embodiment is not provided, but the second operating member 11 is provided with no gear portion 11a, and in FIG. Only the pin 11b and the shaft 11c of the second actuating member 11 are shown. And the pin 11b penetrates the circular arc-shaped long hole 1j formed in the 1st ground plane 1, and is rotatably fitted in the hole of the arm 23 in the blade chamber. Therefore, in the case of the present embodiment, the motor is disposed on the second operating member 11 side, and the rotor 12 rotates the second operating member 11 and the second operating member rotates the arm 23. It has become.

  The arm 19 of the first diaphragm blade disposed in the blade chamber is rotatably attached to the shaft 1h of the first base plate 1 in the same manner as in the second embodiment, and the arm 23 of the second diaphragm blade is As in the case of the first embodiment, the second operating member 11 is rotatably attached to the shaft 11c. In addition to the light shielding portions 19a and 23a, the arms 19 and 23 are formed with overhang portions 19b and 23b, respectively, as in the case of the second embodiment, and the tips of the overhang portions 19b and 23b are formed. The parts are connected by a link member 28 as a transmission means. In addition, the connecting configuration is such that the shafts 28a and 28b provided on the link member 28 are rotatably fitted in the holes formed in the projecting portions 19b and 23b, and correspond to the retaining ring 27 in the second embodiment. A retaining member is used to prevent the removal.

  Next, the operation of the present embodiment will be described, but the points overlapping with the operation description of the first embodiment will be described in a simplified manner. FIG. 7 shows a narrowed state. At this time, the motor coil 15 is in a non-energized state, but this state is maintained by the configuration of the motor already described. In this state, when it is desired to increase the amount of illumination light from the light source, a reverse current is supplied to the coil 15 of the motor. Thereby, the rotor 12 rotates counterclockwise and rotates the arm 23 of the second aperture blade counterclockwise via the second actuating member 11, but the arm 19 and the arm 23 are linked to the link member 28. Therefore, the arm 23 rotates the arm 19 in the clockwise direction. Therefore, the arm 19 and the arm 23 rotate in opposite directions, the blades 21 and 22 are moved upward, and the blade 25 is moved downward to retract from the opening 1a. Thereafter, when the opening 1a is fully opened, it is stopped by a stopper (not shown), and the power supply to the coil 15 is cut off. Further, in order to change from such a fully opened state to the narrowed state shown in FIG. 7, a current in the forward direction is supplied to the coil 15, but the operation in that case is the reverse of the above case. The description will be omitted.

  Thus, in the case of the present embodiment, the rotation of the rotor 12 causes the arm 23 of the second diaphragm blade to rotate via the second operating member 11. Further, the rotation of the arm 23 is transmitted to the arm 19 through the link member 28. However, the present invention is not limited to such a configuration. That is, in this embodiment, the rotor 12 rotates the arm 23 via the second operating member 11, but the arm 23 is directly rotated without providing the second operating member 11. There is no problem. Further, the rotor 12 does not rotate the arm 23 via the second actuating member 11, but the first actuating member 10 is provided without the second actuating member 11, and the first actuating member 10 is interposed therebetween. The arm 19 may be configured to rotate. Further, as in the first embodiment, the first operating member 10 and the second operating member 11 are provided, and instead of the gear portions 10a and 11a, both are connected by a link member corresponding to the link member 28. There is no problem.

  By the way, in each of the above-described embodiments, a current-controlled moving magnet type motor is used as the driving means. However, the first operating member 10 or the second operating member 11 may be manually rotated. Alternatively, an electromagnetic driving device such as a step motor or a DC motor may be used as the driving means. And when using a step motor, a DC motor, etc., it is good to have a reduction gear mechanism. In each of the above embodiments, the optical path area can be selected from a state in which the opening 1a is fully opened and a narrowed state. However, when a manual or step motor is used, It is possible to stop between them and select one or more optical path areas. And what has been made them is an embodiment of the present invention.

  Further, in the case of each of the above embodiments, the first diaphragm blade has two blades 21 and 22. This is because when the first diaphragm blade is retracted from the opening 1a, the two blades 21 and 22 are superposed so that the storage space is smaller than in the case of the single diaphragm like the second diaphragm blade. It is. If it is made up of three, the storage space becomes smaller. And it cannot be overemphasized that such a structure is applicable also to a 2nd aperture blade. In the case of each of the above embodiments, the arm 19 and the arm 23 rotate in opposite directions, but the rotation angles are the same. However, if the rotation angles are different, the center of the square opening area in the narrowed-down state can be shifted in the vertical direction from the center of the opening 1a. As a specific configuration for doing so, in the case of the first embodiment, the pitch circle radii of the gear portions 10a and 11a of the two actuating members 10 and 11 may be made different. In the case of Example 2 and Example 3, the lengths of the projecting portions 19b, 23b from the rotation shafts 1h, 1i of the two arms 19, 23 (the length to the connecting portion) may be different. . All of these are also embodiments of the present invention.

  As is clear from the description of the above embodiments, the first operating member 10 or the second operating member 11 may be directly operated by the driving means. Therefore, the 1st operation member given in a claim is not limited to the 1st operation member 10 in an example, but may be the 2nd operation member 11 in some cases. For the same reason, the first diaphragm blade described in the claims may be the first diaphragm blade or the second diaphragm blade in the embodiment.

It is the front view of Example 1 which showed the full open state of the opening part for optical paths. It is principal part sectional drawing of FIG. It is a rear view of FIG. It is the front view of Example 1 which showed the narrowing-down state of the opening part for optical paths. It is the front view of Example 2 which showed the narrowing-down state of the opening part for optical paths. It is principal part sectional drawing of FIG. It is the front view of Example 3 which showed the narrowing-down state of the opening part for optical paths.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st ground plate 1a, 2a Opening part 1b, 1c, 1e, 1f, 1h, 1i, 10c, 11c, 28a, 28b Shaft 1d, 1g, 1j, 4e, 19c, 14a Long hole 2 2nd ground plate 2b, 2c, 2d, 2e holes 3, 5, 6, 17, 18 screws 4 motor mounting plates 4a, 4b bent portions 4c, 4d positioning pins 7 printed wiring boards 8, 9 sensors 10 first operating members 10a, 11a gear portions 10b, 11b, 23b Pin 11 Second operating member 12 Rotor 12a Output pin 13 First stator frame 14 Second stator frame 15 Coil 16 Yoke 19, 20, 23, 24 Arm 19a, 23a Light shielding portion 19b, 23b Overhang portion 21, 22, 25 Blade 26 Flat washer 27 Retaining ring 28 Link member

Claims (9)

  Two ground planes each having a rectangular optical path opening, forming a vane chamber between them and having one side facing the light source, and both are arranged in the vane chamber, respectively A first diaphragm blade and a second diaphragm blade comprising two arms whose one ends are rotatable with respect to one of the ground planes in a lateral region of the opening and at least one blade pivotally supported by both the arms. A first diaphragm blade attached to one of the two diaphragm blades and reciprocally rotated by a driving means to reciprocate one of the arms of the first diaphragm blade to advance and retract the first diaphragm blade to the opening; One of the arm of the second diaphragm blade is attached to one of the actuating member and the base plate, and the rotation of the first actuating member is transmitted by the transmission means and is rotated in a direction opposite to the first actuating member. Stop apparatus of the source light for adjusting, characterized in that it comprises a second actuating member to advance and retreat in the opening the second diaphragm blade is reciprocating, the a.   The second operating member is not provided, and the transmission means transmits one rotation of the first diaphragm blade arm to one of the second diaphragm blade arms, and one of the first diaphragm blade arms. 2. The diaphragm device for adjusting light source light according to claim 1, wherein one of the arms of the second diaphragm blades is rotated in a direction opposite to that of the second diaphragm blade.   The first actuating member and the second actuating member are not provided, and the driving means directly reciprocates one of the arms of the first aperture blade, and the transmission means is an arm of the first aperture blade. Is transmitted to one of the arms of the second diaphragm blade, and one of the arms of the second diaphragm blade is rotated in a direction opposite to one of the arms of the first diaphragm blade. 2. A diaphragm device for adjusting light of a light source according to claim 1.   The said transmission means is comprised so that the arm of the said 2nd aperture blade may be rotated with a different rotation ratio from the arm of the said 1st aperture blade, The Claim 1 thru | or 3 characterized by the above-mentioned. A diaphragm device for adjusting light source light.   5. The diaphragm device for adjusting light source light according to claim 1, wherein the driving means is an electromagnetic driving device.   6. The aperture device for adjusting light source light according to claim 5, wherein the electromagnetic drive device is constituted by a motor and a reduction gear mechanism.   The transmission means comprises a gear part formed on the first operating member and a gear part formed on the second operating member and meshed with the gear part, or one of the arms of the first diaphragm blade The gear portion formed on the first diaphragm blade and the gear portion formed on one of the arms of the second diaphragm blade and meshed with the gear portion of the first diaphragm blade, A diaphragm device for adjusting light source light according to any one of the above.   The transmission means has a fitting configuration with a pin provided on one of the first operating member and the second operating member and a long hole provided on the other, or one of the arms of the first diaphragm blade. The light source according to any one of claims 1 to 6, wherein the light source has a fitting configuration with a pin provided on one of the arms of the second diaphragm blade and a long hole provided on the other. A diaphragm for light adjustment.   The transmission means has a link structure in which one end of a link member is rotatably attached to the first operating member, or the other end of the link member is rotatably attached to the second operating member, or the arm of the first diaphragm blade 7. A link structure in which one end of a link member is rotatably attached to one side and the other end of the link member is rotatably attached to one of the arms of the second diaphragm blade. 2. A diaphragm device for adjusting light source light according to 1.