JP2007293114A - Light control diaphragm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more smoothly operate a diaphragm blade for controlling light, to simplify the structure of a light control diaphragm, then, to promote the miniaturization of the light control diaphragm. <P>SOLUTION: Two diaphragm blades 16 and 18 are arranged one by one on each side of a sheet-like frame 14, then, respective diaphragm blades 16 and 18 are surely separated from each other across the sheet-like frame 14, then, the diaphragm blades 16 and 18 never rub each other. Consequently, the frictional resistance in this manner is made smaller than that in the case the diaphragm blades 16 and 18 rub each other. Besides, the friction loss in the case respective diaphragm blades 16 and 18 slide is kept constant, irrespective of the sliding directions, consequently, the sliding mechanism for the diaphragm blades 16 and 18 is simply designed, and also, the working performance is kept constant, irrespective of the sliding directions of the diaphragm blades 16 and 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a light amount restricting device used in a projection type high definition television (HDTV) system, a video projector or the like.

  Projection-type high-definition television (HDTV) systems and video projectors use a lamp with a large amount of light as the light source so that the brightness of the image can be adjusted according to the usage environment. What can narrow down is common. Here, when the power applied to the lamp is reduced in order to reduce the light quantity of the lamp, there is a problem that if the lamp is used at 70% or less of the rated power, the lamp life is shortened. In view of this, a light quantity reduction device that mechanically blocks the light of the lamp is widely used so that the light quantity can be adjusted to a necessary light quantity without shortening the life of the lamp. The light quantity diaphragm device includes a plate-like frame in which an opening for daylighting is formed, and two diaphragm blades arranged so as to be slidable in parallel to the plate-like frame so as to close the opening. Then, the shielding area of the opening by the two diaphragm blades is adjusted according to the change in the overlapping area of the two diaphragm blades (see, for example, Patent Document 1).

Japanese Patent No. 2848413

  The present invention relates to an operation of a diaphragm blade for narrowing light in a light quantity diaphragm device that mechanically blocks light from a lamp, which can be used in a projection type high definition television (HDTV) system or a video projector. The purpose of this is to make it possible to perform smoothly. It is another object of the present invention to simplify the light quantity diaphragm device structure and promote miniaturization.

  In order to solve the above-mentioned problems, a light quantity diaphragm device according to the present invention includes a plate-like frame having an opening for daylighting, and is slidable in parallel to the plate-like frame so as to close the opening. The two diaphragm blades are arranged on the same, and the two diaphragm blades are formed in a shape that adjusts the shielding area of the opening according to a change in the overlapping area of each other. The two diaphragm blades are arranged one by one on one side of the plate-like frame, pins are provided upright on both sides of the plate-like frame, and the pins engage with each of the diaphragm blades. A long hole is formed, the long hole extends in parallel with the sliding direction of each diaphragm blade with respect to the plate-like frame, and has a length corresponding to at least the slide stroke of each diaphragm blade required for adjusting the diaphragm. Has the plate shape A slide guide that draws the diaphragm blades toward the surface of the plate-like frame over the entire stroke of the slide strokes of the diaphragm blades on both sides of the frame so that the diaphragm blades are sandwiched from the direction intersecting the sliding direction. It is characterized by being projected in a bowl shape.

  According to the present invention, since the two diaphragm blades are arranged one by one on one side of the plate-like frame, the diaphragm blades are reliably separated by the plate-like frame, and the diaphragm blades do not come into sliding contact with each other. That is, the frictional resistance generated when the diaphragm blades slide is generated between each diaphragm blade and the plate frame, and can be suppressed to be smaller than the frictional resistance when the diaphragm blades are in sliding contact with each other. Further, the friction loss during sliding of each diaphragm blade is constant regardless of the sliding direction. Therefore, the design of the diaphragm blade sliding mechanism is simplified, and the operation performance is constant regardless of the sliding direction of the diaphragm blade.

In addition, the elongated holes formed in each of the diaphragm blades that engage with the pins erected on both sides of the plate-shaped frame extend in parallel with the sliding direction of each diaphragm blade with respect to the plate-shaped frame, and at least the diaphragm adjustment. It has a length corresponding to the sliding stroke of each diaphragm blade that is sometimes required. Therefore, each diaphragm blade is secured with high operating accuracy by guiding the long hole with the pin over the entire stroke of the slide stroke with respect to the plate-like frame.
Furthermore, a slide guide that draws each diaphragm blade toward the surface of the plate-like frame over the entire stroke of the slide blades on both sides of the plate-shaped frame sandwiches each diaphragm blade from the direction intersecting the slide direction. It is projected in a bowl shape. The slide guide covers only a part of each diaphragm blade, so that the diaphragm blade can be prevented from falling off the plate-like frame over the entire stroke of the slide stroke of each diaphragm blade. Therefore, high operating accuracy of each diaphragm blade can be ensured only by the plate-like frame without using a separate falling prevention component such as a diaphragm blade falling prevention cover.

  In the present invention, an arm that includes two drive pins that engage with each of the two diaphragm blades and that simultaneously slide-drives each diaphragm blade, together with a motor that rotationally drives the arm, is provided on one side of the plate-like frame. So that one of the drive pins and the diaphragm blade arranged on the one side are engaged on the one side, so that at least one other drive pin does not obstruct the movement trajectory. It is desirable to penetrate through a hole formed in the plate-like frame and engage with a diaphragm blade disposed on the opposite side of the plate-like frame.

  According to the present invention, the two diaphragm blades arranged so as to sandwich the plate-like frame are both slid and driven by the arm and the motor arranged on one side of the plate-like frame. Thus, it is possible to increase the degree of freedom of the arrangement of the diaphragm blades on the surface that does not include the arm and motor.

In the present invention, the slide guide is provided at two or more positions separated in the sliding direction of the aperture blade, and the aperture blade includes a notch for avoiding the slide guide, and the notch It is desirable that the end of the diaphragm blade in the sliding direction is formed so as not to overlap with the slide guide at other positions in a state in which is coincident with one of the slide guides.
According to the present invention, when the diaphragm blade is assembled to the plate-shaped frame in which the slide guide is integrally formed, the diaphragm blade slide direction in a state where the notch of the diaphragm blade coincides with one of the slide guides of the plate-shaped frame. Since the end portion does not overlap with the slide guides at other positions, the diaphragm blades are set in parallel to both surfaces of the plate-shaped frame without interfering with any slide guide. Thereafter, when the diaphragm blades are slid along the plate-shaped frame, the diaphragm blades are overlapped with the slide guides, and the diaphragm blades are guided by the slide guides to be drawn toward the plate-shaped frame surface side.

In the present invention, the pins provided on both surfaces of the plate-shaped frame may be engaged with the elongated hole in a state where a notch formed in the diaphragm blade coincides with one of the slide guides of the plate-shaped frame. It is desirable that the two diaphragm blades are arranged apart from each other in the sliding direction.
According to the present invention, when the diaphragm blades are assembled to the plate-shaped frame, the diaphragm blades are set in parallel to both surfaces of the plate-shaped frame without interfering with the pins provided on both surfaces of the plate-shaped frame. In addition, since this pin is provided at two locations separated in the sliding direction of each diaphragm blade, each elongated blade is guided by the pin at two locations spaced in the sliding direction, and slides. Accuracy is ensured.

Further, in the present invention, protrusions are formed on both side surfaces of the plate-like frame and surfaces facing the plate-like frame of the slide guide protruding in a hook shape, and between the tips of the protrusions. It is desirable that a gap larger than the thickness of the aperture blade is secured.
According to the present invention, a gap equal to or larger than the thickness of the diaphragm blades is ensured on both side surfaces of the plate-like frame and on the opposite surface of the slide guide protruding in a bowl shape to the plate-like frame. The projection provided in the state makes point contact with the surface of the diaphragm blade, so that it is possible to reduce the frictional resistance when the diaphragm blade slides while ensuring the sliding accuracy of the diaphragm blade.

Further, in the present invention, the protrusions formed on both side surfaces of the plate-like frame are shifted toward the center of the plate-like frame with respect to the protrusions formed on the surface of each slide guide facing the plate-like frame. It is desirable to be provided at a position.
According to this configuration, the protrusions formed on both side surfaces of the plate-like frame and the protrusions formed on the surface of each slide guide facing the plate-like frame are arranged so as to be shifted from each other. When the diaphragm blades are assembled to the plate-shaped frame, the diaphragm blades are inserted obliquely between the surface of the plate-shaped frame and the slide guide projecting like a bowl on the plate-shaped frame. It becomes possible. Therefore, even at a position where the diaphragm blade and the slide guide overlap, by performing such oblique insertion, the diaphragm blade can be set on the surface of the plate-shaped frame without interfering with the slide guide. Accordingly, the degree of freedom in selecting the positions of the plate-like frame and the diaphragm blades to be taken during the assembling work is increased. In addition, the restriction on the installation position of the slide guide of the plate-like frame resulting from considering the assembling work of the diaphragm blades is eased.

In the present invention, it is desirable that concave portions of a certain depth are formed on both surfaces of the plate-like frame to receive each diaphragm blade over the entire stroke of the slide stroke of each diaphragm blade.
According to this configuration, the diaphragm blades are fitted into the concave portion having a constant depth of the plate-like frame, and are more stably held on the plate-like frame. Also, when the diaphragm blade slides with respect to the plate-like frame, the plate-like frame moves in the recess over the entire stroke of the slide stroke, and the sliding accuracy is ensured. Furthermore, this contributes to a reduction in the thickness of the light quantity diaphragm device.

Furthermore, in the present invention, it is preferable that the plate frame is a resin molded product, and the two diaphragm blades are formed of a metal plate.
According to the present invention, when the diaphragm blade slides with respect to the plate-shaped frame, the relatively soft plate-shaped frame absorbs the sliding sound of the metal diaphragm blade and reduces the operating noise of the light quantity diaphragm device. It becomes possible. In addition, by making the plate frame a resin molded product, it is possible to secure good component accuracy while suppressing the manufacturing cost, and by making the aperture blades made of metal, it is possible to obtain lightweight, thin and highly accurate aperture blades. Become.

  Since the present invention is configured as described above, the light is narrowed down in a light quantity diaphragming device that can be used in a projection-type high-definition television (HDTV) system or a video projector and that mechanically blocks the light of the lamp. Therefore, the operation of the diaphragm blades can be performed more smoothly. Further, it is possible to simplify the structure of the light quantity diaphragm device and promote downsizing.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, parts that are the same as or correspond to those in the prior art are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIGS. 1 to 7, the light quantity diaphragm device 10 according to the embodiment of the present invention closes the plate-like frame 14 in which the opening 12 for lighting is formed and the opening 12, Two diaphragm blades 16 and 18 arranged one by one on one side of the plate-like frame 14 are provided. The plate-shaped frame 14 is a resin molded product, and the two diaphragm blades 16 and 18 are both formed of a metal plate. The diaphragm blades 16 and 18 are arranged parallel to the plate-like frame 14 and slidable to each other, and end sides 16a and 18a facing the opening 12 of the two diaphragm blades 16 and 18 (FIGS. 2 and 2). 3) is notched in a stepped shape, and has a shape that adjusts the shielding area of the opening 12 in accordance with the change in the overlapping area. The shapes of the end sides 16a and 18a of the two diaphragm blades 16 and 18 are not limited to the illustrated step shape as long as they exhibit the above functions.

Pins 20 and 22 are erected on both surfaces of the plate-like frame 14. The aperture blades 16 and 18 are respectively formed with long holes 24 and 26 with which the pins 20 and 22 are engaged. The long holes 24 and 26 extend in parallel with the sliding direction of the diaphragm blades 16 and 18 with respect to the plate-like frame 14 and have a length corresponding to at least the slide stroke of the diaphragm blades 16 and 18 required when adjusting the diaphragm. have. In the illustrated example, the long holes 24 and 26 are formed to have a length exceeding the slide stroke of the diaphragm blades 16 and 18 in consideration of workability during assembly. In the present embodiment, the pins 20 and 22 are provided on both surfaces of the plate-like frame 14 at two locations that are separated in the sliding direction of the diaphragm blades 16 and 18. And these pins 20 and 22 need to be located in the long holes 24 and 26 over the whole slide range of each aperture blade 16 and 18. Accordingly, the “length corresponding to the slide stroke” of the aperture blades 16 and 18 of the long holes 24 and 26 is the length obtained by adding the distance between the pins 20 and 22 to the slide distance of the aperture blades 16 and 18. That's it.
Furthermore, slide guides 28 and 30 for pulling the diaphragm blades 16 and 18 toward the surface side of the plate frame 14 are provided on both surfaces of the plate frame 14 over the entire stroke of the slide blades 16 and 18. The diaphragm blades 16 and 18 are projected in a bowl shape so as to be sandwiched from the direction intersecting the sliding direction.

Two bosses 32 are formed on one side (the side appearing in FIG. 1) of the plate-like frame 14, and a motor 36 is fixed to the boss 32 via a bracket 34. The motor 36 is fixed to the plate frame 14 via the boss 32 and the bracket 34, so that a gap is formed between the motor 36 and the plate frame 14. A rotating shaft 37 (FIGS. 4 to 7) of the motor 36 protrudes into the gap between the motor 36 and the plate-like frame 14, and an arm 38 that drives each diaphragm blade 16, 18 is a boss fixed to the arm 38. 40 (FIGS. 4 to 7) is fixed to the rotating shaft 37 of the motor.
That is, the arm 38 that slide-drives each of the diaphragm blades 16 and 18 is disposed on one side of the plate frame 14 together with the motor 36 that rotationally drives the arm 38. The rotating shaft 37 of the motor 36 does not penetrate the plate-like frame 14, and therefore, the motor 36 is placed on the surface (FIG. 3) opposite to one side of the plate-like frame 14 to which the motor 36 is fixed. And there is no protrusion related to the mounting structure. Further, it is not necessary to secure a working space for the arm 18 on the opposite surface.

  In the embodiment of the present invention, the motor 36 and the arm 38 are both provided on the same surface of the plate-like frame 14, but the rotation shaft 37 of the motor 36 penetrates the plate-like frame 14 and is a motor. Of course, it is possible to project the arm 38 to the opposite surface and to arrange the arm 38 on the opposite surface to the motor.

  The arm 38 is an integral part in which the boss 40 is installed at the center in the longitudinal direction, and has two drive pins 42 and 44 that engage with the two diaphragm blades 16 and 18 at both ends. Yes. The drive pins 42 and 44 draw an arcuate movement locus at opposite positions around the rotation shaft 37 of the motor 36 when the arm 38 is driven to rotate by the motor 36. In the state where the arm 38 and the motor 36 are attached to the plate-like frame 14 as shown in the drawing, the drive pins 42 and 44 both have a length penetrating the plate-like frame 14. Further, through holes 46 and 48 are formed in the plate-like frame 14 so as not to obstruct the movement trajectory of the drive pins 42 and 44. The drive pins 42 and 44 are connected to the through holes 46 and 48. An arc-shaped movement trajectory is drawn inside. The through holes 46 and 48 are generally rectangular in the illustrated example, but may be formed in an arc shape along the movement locus of the drive pins 42 and 44.

  Further, each of the diaphragm blades 16 and 18 has only a driving force in a direction parallel to the sliding direction of the diaphragm blades 16 and 18 (left and right direction in FIGS. 2 and 3) from the arc-shaped movement locus of the drive pins 42 and 44. In order to cancel out the driving force in the direction perpendicular to the sliding direction (the vertical direction in FIGS. 2 and 3), slits 50 and 52 having substantially the same width as the diameters of the driving pins 42 and 44 are provided on the diaphragm blades 16 and 18. Are formed in a direction perpendicular to the sliding direction. The drive pin 42 is engaged with the slit 50 of the diaphragm blade 16 disposed on one side to which the motor 36 and the arm 38 of the plate frame 14 are fixed, and disposed on the opposite surface side of the plate frame 14. The drive pin 44 is engaged with the slit 52 of the diaphragm blade 18. Therefore, the diaphragm blades 16 and 18 can be driven to slide simultaneously by rotating the arm 38 within a certain angle range by the motor 36.

  In FIG. 2, the drive pin 42 is located at the right end of the through hole 46, and the drive pin 44 is located at the left end of the through hole 48. At this time, the overlapping area between the diaphragm blades 16 and 18 is in a minimum state, and the shielding area of the opening 12 of the plate frame 14 is minimum (opening area maximum). By rotating the arm 38 counterclockwise from this state, the diaphragm blades 16 and 18 slide in the direction in which the mutual overlapping area increases. When the drive pin 42 moves to the left end portion of the through hole 46 and the drive pin 44 moves to the right end portion of the through hole 48, the overlapping area between the aperture blades 16 and 18 becomes the maximum, and the plate-like frame 14 The shielding area of the opening 12 is maximum (opening area minimum). From this state, the arm 38 is rotated again clockwise to return to the state shown in FIG.

  It should be noted that concave portions 14a and 14b of a certain depth for receiving the diaphragm blades 16 and 18 are provided on both surfaces of the plate-like frame 14 over the entire stroke of the slide strokes of the diaphragm blades 16 and 18 (FIG. 1, FIG. 2, FIG. 3 and FIG. 5). Accordingly, the diaphragm blades 16 and 18 always slide in the recesses 14a and 14b.

  Further, the slide guides 28 and 30 and the pins 20 and 22 integrally formed on the plate-like frame 14 and the diaphragm blades 16 and 18 have the following characteristics. Here, the slide guide 28, the pin 20, and the aperture blade 16 provided on one surface side of the plate-like frame 14 will be described as an example with reference to FIGS. 8 to 12, but provided on the other surface. The slide guide 30, the pin 22, and the diaphragm blade 18 have the same characteristics. For convenience of explanation, in FIG. 8 to FIG. 10, illustration of the opening portion 12, the boss 32, and the through holes 46 and 48 formed in the plate frame 14 is omitted.

  First, the slide guide 28 (28A, 28B, 28C) is projected in a bowl shape so as to sandwich the diaphragm blade 16 from the direction intersecting the slide direction, and the slide direction of the diaphragm blade 16 (see FIG. 8 to 10 in the left-right direction in FIG. 10. On the other hand, the diaphragm blade 16 includes a notch 54 for avoiding the slide guide 28, and in the state in which the notch 54 coincides with one of the slide guides 28 (28 </ b> A), 16b in FIG. 8 is formed so as not to overlap the slide guides (28B, 28C) at other positions. In addition, the notch of the aperture blade 18 provided on the opposite surface is indicated by reference numeral 55 in FIG.

  Specifically, as shown in FIG. 8, in a state in which the notch 54 of the diaphragm blade 16 is aligned with the slide guide 28A, the distance L1 between the slide guides 28A and 28B and the slide from the notch 54 of the diaphragm blade 16 are slid. The distance L2 to the direction end portion 16b satisfies the relationship L1> L2, and the distance L4 from the slide direction end portion 16b to the slide guide 28C satisfies L4> 0, so that the above condition is satisfied. Has been. As shown in FIG. 9, the distance L1 between the slide guides 28A and 28B and the distance from the notch 54 of the aperture blade 16 to the end 16c in the sliding direction with the notch 54 aligned with the slide guide 28B. L2 satisfies the relationship of L1> L2 and the distance L4 from the slide direction end portion 16d to the slide guide 28C satisfies L4> 0, so that the above condition is satisfied (L4 The condition of> 0 can be excluded by adopting the configuration described later.

Further, the pin 20 provided on the plate-like frame 14 has two positions where the notch 54 formed on the diaphragm blade 16 engages with the long hole 24 in a state where the notch 54 is coincident with one of the slide guides 28 of the plate-like frame 14. Further, the diaphragm blades 16 are spaced apart from each other in the sliding direction.
Specifically, as shown in FIG. 8, the right pin of the two pins 20 that are spaced apart in the sliding direction of the aperture blade 16 with the notch 54 aligned with the slide guide 28A; The distance L3 from the right end of the long hole 24 is L3> 0, and as shown in FIG. 9, the notch 54 is aligned with the slide guide 28B in the sliding direction of the aperture blade 16. The distance L3 between the left pin of the two pins 20 that are spaced apart from each other and the left end of the long hole 24 satisfies L3> 0, whereby the above condition is satisfied.

Further, as shown in FIG. 10, a hemispherical projection 56 is formed on the surface of the plate-like frame 14, and a hemispherical projection 58 is provided on the surface of the slide guide 28 projecting in a bowl shape so as to face the plate-like frame. (The protrusions on the opposite surface are respectively indicated by reference numerals 60 and 62 in FIG. 5). As shown in FIG. 11, a gap S equal to or greater than the thickness t of the diaphragm blade 16 is secured between the tips of the protrusions 56 and 58.
In addition, as shown in FIG. 12, the projection 56 formed on the surface of the plate-like frame 14 is different from the projection 58 formed on the surface of each slide guide 28 facing the plate-like frame. It is provided at a position shifted toward the center (upper side in FIG. 12).

Now, according to the embodiment of the present invention having the above-described configuration, the following operational effects can be obtained.
First, since the two diaphragm blades 16 and 18 are arranged one by one on one side of the plate-like frame 14, the diaphragm blades 16 and 18 are reliably separated by the plate-like frame 14, and the diaphragm blades 16 and 18 are mutually connected. There is no sliding contact. That is, the frictional resistance generated when the diaphragm blades 16 and 18 slide is generated between the diaphragm blades 16 and 18 and the plate frame 14, and the frictional resistance when the diaphragm blades 16 and 18 are in sliding contact with each other. Can be kept smaller. Further, the friction loss when the diaphragm blades 16 and 18 slide is constant regardless of the sliding direction. Therefore, the design of the sliding mechanism of the diaphragm blades 16 and 18 is simplified, and the operation performance is constant regardless of the sliding direction of the diaphragm blades 16 and 18.

  In addition, the long holes 24 and 26 formed in each of the diaphragm blades 16 and 18 with which the pins 20 and 22 erected on both surfaces of the plate frame 14 are engaged with each other. It extends in parallel with the 18 slide directions and has a length corresponding to at least the slide stroke of each of the diaphragm blades 16 and 18 required during aperture adjustment. Accordingly, the diaphragm blades 16 and 18 are guided by the long holes 24 and 26 by the pins 20 and 22 over the entire stroke of the slide stroke with respect to the plate frame 14, so that the diaphragm blades 16 and 18 have high operation accuracy. Is secured.

Furthermore, slide guides 28 and 30 for pulling the diaphragm blades 16 and 18 toward the surface side of the plate frame 14 are provided on both surfaces of the plate frame 14 over the entire stroke of the slide blades 16 and 18. The diaphragm blades 16 and 18 are projected in a bowl shape so as to be sandwiched from the direction intersecting the sliding direction. The slide guides 28 and 30 cover only a part of the diaphragm blades 16 and 18, so that the diaphragm blades 16 and 18 are dropped from the plate frame 14, and the slide strokes of the diaphragm blades 16 and 18 are moved. Can be prevented over the entire process. Accordingly, each diaphragm blade 16, 18 can be used only by the plate-like frame 14 (and slide guides 28, 30 integrated therewith) without using a separate drop prevention component such as a cover for preventing the diaphragm blades 16, 18 from falling off. It is possible to ensure high operating accuracy.
In addition, since the slide guides 28 and 30 are in sliding contact with only a part of the diaphragm blades 16 and 18, friction loss during sliding compared to a cover that covers the entire diaphragm blades 16 and 18 such as a drop-off prevention cover. Is small.

  Further, since the two diaphragm blades 16 and 18 arranged so as to sandwich the plate-like frame 14 are both slid and driven by the arm 38 and the motor 36 arranged on one side of the plate-like frame 14, On the surface (FIG. 3) opposite to the one surface side of the plate-like frame 14 to which the motor 36 is fixed, there are no protrusions related to the motor 36 and its mounting structure, and an operating space for the arms 16 and 18 is secured. There is no need. Therefore, it is possible to increase the degree of freedom of arrangement of the diaphragm blades 18 on the surface of the plate-like frame 14 on the side where the arm 38 and the motor 36 are not provided. Further, since the degree of freedom of arrangement of the diaphragm blades 18 is increased, it is possible to organize the entire structure of the light quantity diaphragm device 10 and promote downsizing.

Further, when the diaphragm blades 16 (18) are assembled to the plate-shaped frame 14, the notches 54 (55) of the diaphragm blades 16 are moved as shown in FIG. 8 and FIG. 30) Since the sliding direction end portions 16b, 16c, 16d of the diaphragm blade 16 do not overlap with the slide guides 28B or 28C at other positions in a state of being coincident with one 28A or 28B of 30), the diaphragm blade 16 is It is set parallel to both surfaces of the plate frame 14 without interfering with any slide guide 28. Thereafter, when the diaphragm blades 16 are slid along the plate frame 14, the diaphragm blades 14 overlap the slide guides 28 (see FIGS. 2 and 3), and the diaphragm blades are moved by the slide guides 28 to the plate frame 14. It is guided so that it may be drawn in to the surface side.
When the diaphragm blades 16 (18) are assembled to the plate frame 14 at the position shown in FIG. 9, a rib (wall) is provided at the right end of the plate frame 14 in response to a request for improving the strength of the plate frame 14. When it is necessary to provide the plate frame 14, it is necessary to extend the plate frame 14 to the right by the width of the rib in order to avoid interference between the rib and the right end of the diaphragm blade 16.

  Further, when the diaphragm blades 16 (18) are assembled to the plate-shaped frame 14, the pins 20 (22) provided on both surfaces of the plate-shaped frame 14 do not interfere with the diaphragm blades 16 and both surfaces of the plate-shaped frame 14. Set in parallel with Moreover, since this pin 20 is provided at two locations that are separated in the sliding direction of each diaphragm blade 16, each diaphragm blade 16 is at two locations that are separated in the sliding direction, and the long hole is formed by the pin 20. Guided and slide accuracy is ensured.

  Further, a gap larger than the thickness t of the diaphragm blades 16 (18) is formed on both side surfaces of the plate-like frame 14 and the surface of the slide guide 28 (30) projecting in a bowl shape. The projections 56, 58 (60, 62) provided in a state where S is secured are in point contact with the surface of the diaphragm blade 16, so that the diaphragm blade 16 slides while ensuring the sliding accuracy of the diaphragm blade 16. It is possible to reduce the frictional resistance.

In addition, the projections 56 (60) formed on both side surfaces of the plate-shaped frame 14 are plate-shaped with respect to the projections 58 (62) formed on the surface of each slide guide 28 (30) facing the plate-shaped frame 14. Since it is provided at a position shifted toward the center of the frame 14, a large gap is generated between both protrusions. Therefore, when the diaphragm blades 16 (18) are assembled to the plate-like frame 14, as shown in FIG. 12, the surface of the plate-like frame 14 and the slide guide 28 protruding in a bowl shape on the plate-like frame 14 are provided. It is possible to insert the diaphragm blades 16 obliquely between the two. That is, even when the aperture blade 16 and the slide guide 28 overlap each other, the aperture blade 16 can be set on the surface of the plate-like frame 14 without interfering with the slide guide 28 by performing such oblique insertion. It becomes. Accordingly, the degree of freedom in selecting the positions of the plate-like frame 14 and the diaphragm blades 16 to be taken during the assembling work is increased.
In addition, the restriction on the installation position of the slide guide 28 (30) of the plate-like frame 14 resulting from considering the assembling work of the aperture blade 16 (18) is eased. Specifically, by performing the above-described oblique insertion of the aperture blade 16 (18), the condition of L4> 0 described in FIGS. 8 and 9 can be excluded.

  In addition, the diaphragm blades 16 and 18 are fitted into the concave portion 14b of a certain depth of the plate-like frame 14 and are held on the plate-like frame 14 more stably. Further, when the diaphragm blades 16 and 18 slide with respect to the plate-like frame 14, the plate-like frame 14 moves in the recess 14b over the entire stroke of the slide stroke, so that sliding accuracy is ensured. Furthermore, this contributes to a reduction in the thickness of the light quantity diaphragm device 10.

  Further, when the diaphragm blades 16 and 18 slide with respect to the plate frame 14, the relatively soft plate frame 14 which is a resin molded product absorbs the sliding sound of the metal diaphragm blades 16 and 18, and the light quantity It is possible to reduce the operating sound of the diaphragm device 10. Further, by making the plate-like frame 14 a resin molded product, it is possible to secure good component accuracy while suppressing the manufacturing cost, and by making the diaphragm blades 16 and 18 made of metal, a lightweight, thin and highly accurate diaphragm blade is obtained. It becomes possible.

It is a perspective view of the light quantity diaphragming device concerning an embodiment of the invention. FIG. 2 is a front view of the light quantity diaphragm device shown in FIG. 1. FIG. 2 is a rear view of the light quantity diaphragm device shown in FIG. 1. FIG. 2 is a left side view of the light quantity diaphragm device shown in FIG. 1. FIG. 2 is a right side view of the light quantity diaphragm device shown in FIG. 1. FIG. 2 is a top view of the light quantity diaphragm device shown in FIG. 1. FIG. 2 is a bottom view of the light quantity diaphragm device shown in FIG. 1. It is a schematic diagram which shows the specific characteristics of the slide guide and pin integrally molded in the plate-shaped frame, and the aperture blade of the light quantity aperture device according to the embodiment of the present invention. It is a schematic diagram which shows the specific characteristics of the slide guide and pin integrally molded in the plate-shaped frame, and the aperture blade of the light quantity aperture device according to the embodiment of the present invention. It is a schematic diagram which shows the specific characteristic of the slide guide formed in the plate-shaped frame of the light quantity diaphragming apparatus which concerns on embodiment of this invention. It is arrow A figure of FIG. It is an arrow B figure of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10: Light quantity stop apparatus, 12: Opening part, 14: Plate-shaped frame, 14a, 14b: Concave part of fixed depth, 16, 18: Diaphragm blade, 20, 22: Pin, 24, 26: Slotted hole, 28, 30 : Slide guide, 36: Motor, 38: Arm, 42, 44: Drive pin, 46, 48: Through hole, 50, 52: Slit, 54, 55: Notch, 56, 58, 60, 62: Projection

Claims (8)

A plate-like frame in which an opening for daylighting is formed, and two diaphragm blades arranged so as to be slidable in parallel to the plate-like frame so as to close the opening. The diaphragm blade is a light amount diaphragm device formed in a shape that adjusts the shielding area of the opening according to a change in the overlapping area of each other,
The two diaphragm blades are arranged one by one on one side of the plate frame,
Pins are erected on both surfaces of the plate-like frame, and each of the diaphragm blades is formed with a slot that engages with the pin, and the slot corresponds to the sliding direction of each diaphragm blade with respect to the plate-like frame. Extending in parallel and having a length corresponding to at least the sliding stroke of each diaphragm blade required at the time of aperture adjustment,
A slide guide that draws each diaphragm blade toward the surface of the plate frame over the entire stroke of the slide stroke of each diaphragm blade on both sides of the plate-shaped frame is a direction intersecting each diaphragm blade with its sliding direction. A light quantity restricting device, wherein the light amount restricting device protrudes like a bowl so as to be sandwiched between the two. An arm having two drive pins that engage with each of the two diaphragm blades and slidingly driving each diaphragm blade at the same time is disposed on one side of the plate-like frame together with a motor that rotationally drives the arm, One of the drive pins and the diaphragm blade arranged on one side engage with each other, and at least one other drive pin is formed on the plate-like frame so as not to obstruct the movement trajectory. 2. The light quantity diaphragm device according to claim 1, wherein the diaphragm is engaged with a diaphragm blade disposed on an opposite surface side of the plate-like frame through the hole formed therein. The slide guide is provided at two or more positions separated in the sliding direction of the aperture blade,
The aperture blade includes a notch for avoiding the slide guide, and the slide blade has an end in the sliding direction at a position other than the slide guide in a state where the notch coincides with one of the slide guides. The light quantity diaphragm device according to claim 1, wherein the light amount diaphragm device is formed so as not to overlap with the light amount. The pins provided on both surfaces of the plate-like frame are in two positions where the notches formed in the diaphragm blades engage with the elongated holes in a state where the notch is coincident with one of the slide guides of the plate-like frame. 4. The light quantity diaphragm device according to claim 3, wherein the diaphragm blades are spaced apart from each other in the sliding direction. Protrusions are formed on both side surfaces of the plate-like frame and surfaces facing the plate-like frame of the slide guide projecting in a bowl shape. Between the tips of the protrusions, the thickness is equal to or greater than the thickness of the diaphragm blades. The light quantity diaphragm device according to any one of claims 1 to 4, wherein a gap is secured. The protrusions formed on both side surfaces of the plate-like frame are provided at positions shifted toward the center of the plate-like frame with respect to the protrusions formed on the surface of each slide guide facing the plate-like frame. The light quantity diaphragm device according to claim 5. 7. A concave portion having a fixed depth is formed on both surfaces of the plate-like frame for receiving each diaphragm blade over the entire stroke of the slide stroke of each diaphragm blade. The light quantity restricting device according to claim 1. The light quantity diaphragm device according to any one of claims 1 to 7, wherein the plate frame is a resin molded product, and the two diaphragm blades are formed of a metal plate.

Images