JPH0712974Y2 - Diaphragm device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a diaphragm device such as a video camera.

[Conventional technology]

Conventionally, as a diaphragm device for a camera, for example, a video camera, there is one disclosed in Japanese Utility Model Laid-Open No. 59-4524. As shown in FIG. 23, this diaphragm device includes a drive device 310 having an operating lever 320 having drive pins 321 and 322, a diaphragm opening 363, guide slits 365 and 367 provided on both side edges, and an elongated hole with which the drive pin 321 is engaged. A diaphragm blade 361 having 369, a diaphragm opening 364, guide slits 366 and 368 provided on both side edges, and a drive pin 322.
Diaphragm blade 362 having an elongated hole 370 to be engaged with, an opening 331,
Guide shaft 33 that engages with the guide slits 365,366,367,368
And a main plate 330 having 2,333,334,335, and a drive unit 310
Driven by the drive pins 321, 322, the two diaphragm blades 3
61,362 are designed to open and close.

Further, the guide shafts 332, 334, 333, 335 are step shafts having a flange α as shown in FIGS. 24 and 25, and a pair of guide shafts 332, 334 for supporting the blades 361 facing the main plate 330 and a pair of guide shafts 362 for supporting the blades 362. Guide shafts 333, 335 and blades 361
33 on the main plate 330 forming a step greater than the thickness of the
It is planted at 6,338,337,339 respectively.

Further, among the guide shafts 332, 334, 333, 335, at least one shaft 334 of the pair of guide shafts 332, 334 that supports the blade 361 facing the main plate 330 is a step shaft formed by one step more than the other shafts, and by this step Formed and the blade 362
Of the pair of guide shafts 333, 335 that support the blade 316 and the flange α of the pair of guide shafts 333 and 335 are substantially flush with each other.

[Problems to be solved by the device]

By the way, this type of diaphragm device has a diametrically opposite surface.
A form in which the two driving pins 321 and 322 reciprocate at a rotation angle of less than 80 ° to directly translate the two diaphragm blades 361 and 362 in parallel in a relatively opposite direction, that is, to convert the arc motion into a linear motion. Therefore, it is unavoidable that a twist is added to the upper and lower diaphragm blades 361 and 362.

However, in the above-mentioned diaphragm device, since the guide shafts 32 to 35 are erected on the protrusions 336 to 338, a gap is generated between the protrusions 336 to 338 and the guide shafts 332 to 335. The blades 361 and 362 are pinched, and the guide shaft 332-
There is a problem that burrs and the like are generated in the vicinity of the joints of the protrusions 336 to 338 of the 335 during processing, and the guide slits 365 to 368 are caught, so that the processing accuracy is easily affected.

Also, guide shafts 32 to 35 are erected on the protrusions 336 to 338,
Therefore, since the protrusions 337 and 338 are provided at the same positions as the guide shafts 333 and 334, the protrusions 337 and 338 are not provided with the guide slits 366 and 367.
Does not support the edges of the moving direction. Therefore, the wings 361,
The tip side of the 362 is liable to hang down, which easily hinders smooth movement.

[Purpose of device]

An object of the present invention is to obtain a diaphragm device capable of reducing the contact resistance over the entire opening and closing of the blade while supporting the side edge of the blade as stably as possible and smoothly opening and closing the blade.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a driving device in which a pair of blades is linearly movably sandwiched between a pair of substrates having a light receiving opening so as to be linearly movable in a relatively opposite direction, and the blades are attached to one substrate. A diaphragm device that opens and closes the light receiving opening by linearly displacing it by an arc motion of both ends of a rotating lever,
A guide device comprising: a guide slit provided on each of the blades along a movement direction; and a guide pin provided on one of the substrates and guiding the blade by engaging with each of the guide slits. On the side edge on one side in the direction intersecting the moving direction of each blade,
Two pieces are provided in sequence along the moving direction of the blades, and the guide slits on the side farther from the drive device out of the two guide slits provided on each blade are extended along the moving direction. A rib is provided on the substrate at a position different from each guide pin that engages with the distant guide slit, and the other end side edge portion in the moving direction of the distant guide slit is in contact with over the entire moving range. It has a different configuration.

[Action]

Since each blade is guided by a pair of guide pins provided at the front and rear of the moving direction, there is no need for a rotational movement about the guide pin as in the case of one guide pin,
The blades can be moved in a completely linear manner.

Moreover, of the two guide slits provided on the blade,
Along the extension of the guide slit in the moving direction of the drive unit, the other end side edge of the guide slit in the moving direction is provided with a rib that makes contact over the entire moving range.
The outer edge of the blade is supported as much as possible to prevent the blade from hanging down, the contact resistance can be reduced over the entire opening and closing of the blade, and the blade can be opened and closed smoothly.

Further, since the rib is provided at a position different from the guide pin that engages with the guide slit farther from the driving device, unlike the conventional case in which both of them are coaxially above and below, processing of the connecting portion between the guide pin and the substrate is performed. The guide slit can move smoothly along the guide pin without being affected by accuracy.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 22.

<Structure> As shown in FIGS. 1 to 5, the diaphragm device of this embodiment has a substrate, for example, a base plate 1, two diaphragm blades 3 and 5 to which the base plate 1 is attached, and these diaphragm blades 3, 5. A substrate that covers 5 such as a pressing plate 7 and a driving device 9 that drives the diaphragm blades 3 and 5 are provided.

As shown in FIG. 6, the main plate 1 has a connector mounting portion 11, a light receiving opening 12 provided in the center, side walls 13 and 14 provided on both sides of the light receiving opening 12, and arcuate operation holes 15 and 16. , An arcuate protrusion 17 provided at the tip and mounting holes 18 and 19 of the drive device 9.
, Insertion hole 20, fixing hole 21, tip projections 22, 23, and side wall 1
Two guide members provided on the 3 and 14 sides, for example guide pins 24, 25, 26 and 27, and ribs provided outside the operating holes 15 and 16.
28, 29, ribs 30 and 31 provided in the outer peripheral direction of the light receiving opening 12 from the inside of the operation holes 15 and 16, ribs 32 and 33 provided near the side walls 13 and 14, and the side wall 13, Rib in the center between 14
34 and protective projections 35, 36 around the operating holes 15, 16 as shown in FIG.
It has and.

As shown in FIG. 6, the connector mounting portion 11 has pin holes 41, 42.
, Fixing hole 43, mounting hole 44, and mounting pin 45 shown in FIG.
And are provided.

The light receiving opening 12 is provided with a notch 46.

The guide pins 25 and 27 are located inside the guide pins 24 and 26 as shown in FIG.

The ribs 29, 33, 34 are formed higher than the other ribs 28, 30, 31, 32.

The ribs 32, 33 are rib portions extending along the side walls 13, 14 between the projections 22, 23 and the guide pins 24, 26, and of the guide slits 51, 57 on the side remote from the drive device described later. For example, ribs 32A, 33A narrower than the width of the guide slits 51, 57 for holding the moving direction edge portions 51A, 57A in contact with each other over the entire moving range, and guides provided in a direction perpendicular to the ribs 32A, 33A. Ribs with which the widthwise edges 51B and 57B of the slits 51 and 57 contact
It has 32B and 33B. The ribs 32 and 33 are guide pins 2
Although it extends to the vicinity of 4,26, it does not overlap with the guide pins 24,26, and thus they are provided at different positions.

As shown in FIG. 9, two diaphragm blades 3 are sequentially provided along the moving direction of the blade at one side edge portion in a direction intersecting the moving direction of the blade 3, and engage with the guide pins 24, 25. Guide slits (oblong holes) 51, 52 parallel to the side edges, guides such as oblong holes 53 provided in a direction at right angles to the moving direction of the diaphragm blades 3, an aperture opening edge 54 having an obtuse angle portion 60, And a triangular filter 55. Incidentally, as shown in FIG. 7, when the diaphragm blade 3 is mounted on the base plate 1, the width is such that the end portions facing the guide slits 51, 52 do not contact the side wall 14.

The filter 55 is linearly cut at the overlapping portion with the diaphragm blade 5, has a mounting hole 62 as shown in FIG. 3, and is fixed to the diaphragm blade 3 with an adhesive.

The diaphragm blade 5 has an obtuse angle portion 61 provided at the center as shown in FIG.
And a diaphragm opening 56 having a plurality of aperture openings, and two parallel to the side edges engaged with the guide pins 26 and 27, which are sequentially provided in pairs on one side edge portion in a direction intersecting the moving direction of the blades 5 along the moving direction of the blades. It is provided with guide slits (oblong holes) 57 and 58, and guides, for example, oblong holes 59, provided in a direction perpendicular to the moving direction of the diaphragm blades 5.

When the diaphragm blade 5 is attached to the main plate 1 as shown in FIG. 7,
The width is such that the end portions facing the guide slits 57, 58 do not contact the side wall 13.

The holding plate 7 has an opening 70 facing the light receiving opening 12 of the main plate 1 and operating holes 71, 72 facing the operating holes 15, 16 as shown in FIG.
And holes 73,74,75,76 facing the holes 18,19,20,21, pin holes 77,78,79,80 facing the guide pins 24,25,26,27, and the operating holes 71, Ribs that are provided on the periphery of 72 and project toward the diaphragm blades 3 and 5
81,82 and ribs 83,84 provided inside the operating holes 71,72
And ribs 85, 86 provided on the side of the opening 70 and the operating holes 71, 72, and ribs 87, 88 provided on the tip side of the opening 70.
And engaging portions 89, 90 having holes (not shown) for engaging the tip protrusions 22, 23.

The pressing plate 7 configured as described above is attached by engaging the engaging portions 89 and 90 with the tip protrusions 22 and 23 of the main plate 1 as shown in FIG. 1 and screwing the screw 91 into the hole 21 through the hole 76. To be

As shown in FIG. 11, the drive device 9 includes an operating portion such as an operating lever.
100, spring 101, mounting cover 102, and cylindrical yoke 1
03, a magnet 105 having a rotating shaft 104, and a pair of bearing washers 106, 1 having shaft holes 113, 114 and supporting both sides of the rotating shaft 104.
07, a pair of coil frames 108 and 109 for covering the magnet 105, a magnetic detection element wiring flexible cable 110 (for example, a flat wiring sheet), a coil wiring flexible cable 111 (for example, a flat wiring sheet), and a pressing cover 112. Is equipped with.

The operating lever 100 includes a mounting portion 120 having a D-shaped insertion hole 120A into which the rotary shaft 104 is inserted, as shown in FIG.
Engaging portions that engage with the long holes 53 and 59 of 3, 5 such as drive pins 121 and 122, and holding portions 123 and 124 that hold one end of the spring 101.
It has and.

The mounting cover 102 has a column 12 having mounting holes 125 and 126 facing the mounting holes 18 and 19 of FIG. 6 as shown in FIGS. 17 (A) and (B).
7, 128, an insertion hole 129 opposed to the insertion hole 20, and a pair of hooks 130, and the columns 127, 128 are screwed 147, as shown in FIG.
It is fixed to the main plate 1 by 148.

At the tip of the rotating shaft 104, a mounting portion 104A having a D-shaped cross section with a peripheral surface partially cut is provided. As shown in FIG. 14, a pair of magnetic field processing display grooves 132 are provided on the end surface of the magnet 104.

The coil frames 108 and 109 have the same structure, and are the receiving grooves of the magnet 105.
133, a window 134 provided in the accommodation groove 133, and an accommodation groove 133
A shaft groove 135 provided at both ends of the shaft groove 135, a mounting groove 136 for mounting the washers 106 and 107 provided in the shaft groove 135, and an engagement hole 137.
, The engaging protrusion 138, the hook engaging groove 139, and FIG.
16 Inner flange 140, outer flange 141 with a pair of pin mounting holes 143 on both end faces, and inner flange 140
The coil winding portion 14 provided between the 140 and the outer flange 141.
2 and an accommodating portion 144 for attaching the flexible cable 110 for magnetic detection element wiring provided on the outer flange 141 as shown in FIG. 13, the coil winding portion 142 is wound with the coil 145, and the pin attaching hole is provided. A connecting protrusion, for example, a metal pin 146 is attached to 143, and the end of the coil 145 is attached to the pin 14
Wrapped around 6 and soldered.

The magnetic detection element wiring flexible cable 110 is made of, for example, a synthetic resin in a sheet shape, and a magnetic detection element 150 such as a Hall element that detects the amount of rotation of the magnet 105 is attached and an attachment portion 151 that is accommodated in the accommodation portion 144, A hole 152 facing the shaft groove 135 and a connecting portion to be connected to the connector 153 of FIG.
154 and four wires for power supply and output of the magnetic detection element 150
155 and attached as shown in FIGS. 19 and 20.

Similar to the magnetic detection element wiring flexible cable 110, the coil wiring flexible cable 111 is formed of a synthetic resin in a sheet shape, and has a hole 156 and a pin 14 facing the axial groove 135.
Four mounting portions facing each other, for example, a mounting portion 158 having a pin hole 157, and a connecting portion 160 connected to the connector 159 of FIG.
And four wires 161 connected to both ends of the two coils 145
And is mounted on the flexible cable 110 for wiring the magnetic detection element in the state of FIG. 19 as shown in FIG.

Then, the flexible cables 110 and 111 are guided to the main plate 1 side along the peripheral surface of the yoke 103, and as shown in FIG.
Fixed at 5.

The connectors 153 and 159 are connected to the printed circuit board 162 as shown in FIG.
Is attached to. This printed circuit board 162 is
It has a fixing hole 163 facing the fixing hole 43 in the figure, a hole facing the mounting hole 44, and a hole that engages with the mounting pin 45.
It is fixed to the connector mounting portion 11 by.

The cover 112 has four pins 1 as shown in FIGS. 12 (A) and (B).
Hole 170 facing 46, two round holes 171, hook engaging groove
It has a hook 172 that engages with 139 and is attached to the coil frames 108 and 109 as shown in FIGS. 3 and 4.

With the configuration as described above, the rib 32 with which the moving direction edges 51A, 57A of the guide slits 51, 57 contact the main plate 1 along the moving direction extension lines of the guide slits 51, 57 of the diaphragm blades 3, 5
Since A and 33A are provided, for example, as shown in FIG.
The rib 33A comes into contact only with the edge portion 57A when moving.

Therefore, while stably supporting the side edges of the diaphragm blades 3 and 5 as much as possible, the contact resistance can be reduced over the entire opening and closing of the diaphragm blades 3 and 5, and the diaphragm blades 3 and 5 can be smoothly opened and closed. can do.

Further, since the ribs 32B and 33B that come into contact with the edge portions 51B and 57B of the guide slits 51 and 57 are provided, the edge portions 51B and 5 having a narrow width and tending to bend.
7B can be stably supported over the entire opening and closing of the diaphragm blades 3 and 5, and the diaphragm blades 3 and 5 can be smoothly opened and closed.

In the above embodiment, the ribs 32A and 33A that contact the moving direction edge portions 51A and 57A of the guide slits 51 and 57 are provided on the extension lines of the guide pins 24 and 26, but the guides are provided on the extension lines of the guide pins 25 and 27. A rib may be provided so as to contact the edges of the slits 52 and 58 in the moving direction. When the order of assembling the diaphragm blades 3 and 5 is reversed, the ribs provided on the base plate 1 and the ribs provided on the pressing plate 7 may be provided in reverse.

<Operation> In such a configuration, this diaphragm device is inserted into the lens barrel of the camera across the optical path, the tip is positioned by the protruding portion 17, and is fixed to the lens barrel through the holes 43 and 163 with screws. .

In such a state, when the diaphragm is set by the manual operation, the coil 145 is excited so that the output corresponding to the set value can be obtained from the magnetic detection element 150. As a result, the magnet 105 rotates, and the operating lever 100 rotates clockwise in FIG. Therefore, the drive pin 12 of FIG.
1,122 moves in the long holes 53,59 of the diaphragm blades 3,5, the diaphragm blade 3 is guided by the guide pins 24,25 and moves to the right, and the diaphragm blade 5 is guided by the guide pins 226,27. Move to the left to form the set diaphragm aperture.

Then, under the photographing condition where the diaphragm blades 3 and 5 should be sufficiently narrowed down, the photographing light is reduced in quantity by the filter 55 instead of being reduced in quantity by the diaphragm blades 3 and 5. Therefore, the filter 55 does not use the diaphragm device with an extremely small diaphragm aperture, and hunting of the driving device 9 and diffraction of light are avoided.

When the excitation of the coil 145 is released, the return force of the spring 101 closes the diaphragm blades 3 and 5 to the state shown in FIG.

[Effect of device]

According to this invention, since each blade is guided by a pair of guide pins provided at the front and rear in the moving direction, there is no need for a rotational movement about the guide pin as in the case of one guide pin. , The blades can be moved completely linearly. Moreover, of the two guide slits provided on the blade, the other end side edge portion in the moving direction of the farther guide slit extends over the entire moving range along an extension line of the farther guide slit in the moving direction. Since the ribs that come into contact with each other are provided, it is possible to support the outer edge of the blade as much as possible and prevent the blade from hanging down, it is possible to reduce the contact resistance throughout the opening and closing of the blade, and to open and close the blade smoothly. it can.

Further, since the guide pins that engage the ribs with the guide slits far from the drive device are provided at different positions, the guide slits are not affected by the processing accuracy of the connecting portion between the guide pin and the substrate, You can move smoothly.

[Brief description of drawings]

1 to 22 show one embodiment of the present invention,
Each figure represents the following: 1 is a front view of the diaphragm device, FIG. 2 is a bottom view of the diaphragm device, FIG. 3 is a rear view of the diaphragm device, FIG. 4 is a left side view of the diaphragm device, and FIG. 5 is a main plate 1 and an operating lever. FIG. 6 is a view showing a mounting state of 100, FIG. 6 is a view showing a structure of the base plate 1, FIG. 7 is a view showing a state in which diaphragm blades 3 and 5 are placed on the base plate 1, and FIG. 8 is a structure of the pressing plate 7. FIG. 9, FIG. 9 and FIG. 10 are views showing the shapes of the two diaphragm blades 3 and 5, FIG. 11 is a view showing the configuration of the driving device 9, and FIGS. 12 (A) and (B) are covers. 112 shows the structure of 112, FIG. 13 is a front view of the coil frame 108, and FIG. 14 is the magnet 105.
15 is a plan view of the coil frame 109, FIG. 16 is a side view of the coil frame 109, and FIGS. 17 (A) and (B) are mounting covers 1
A view showing the structure of 02, FIG. 18 is a view showing the structure of the actuating lever 100, FIG. 19 is a view showing a state in which the flexible cable 110 for magnetic detection element wiring is attached to the coil frames 108 and 109,
FIG. 20 is a view showing a state in which the mounting portion 151 of the flexible cable 110 for magnetic detection element wiring is attached to the housing portion 144 of the coil frame 108, and FIG. 21 is the flexible cable 110 for magnetic detection element wiring and the coil in the coil frames 108 and 109. FIG. 22 is a view showing a state in which the wiring flexible cable 111 is attached, and FIG. 22 is a view showing a state in which the rib 33 and the diaphragm blade 5 are overlapped with each other. 23 to 25 are views for explaining the conventional technique. 1 ...... Base plate 3, 5 ...... Aperture blade 7 ...... Press plate 9 ...... Drive device 12 ...... Light receiving aperture 24 to 27 ...... Guide pin 32, 32A, 32B ...... Rib 33, 33A, 33B ...... Rib 51 , 52 …… Guide slit 53 …… Oval hole 55 …… Filter 57,58 …… Guide slit 59 …… Oval hole 51A, 51B, 57A, 57B …… Edge 100 …… Actuating lever 121,122 …… Drive pin

Continuation of the front page (56) Reference JP-A-57-38425 (JP, A) JP-A-57-125968 (JP, A) Actually opened 62-197134 (JP, U) Actually opened 60-74133 (JP , U) Actually open Sho 61-121429 (JP, U) Actually open Sho 59-4524 (JP, U) Special public Sho 57-53575 (JP, B1) Special public Sho 57-46534 (JP, B1) Special public Sho 36-20138 (JP, B2) US Patent 3938168 (US, A)

Claims (1)

[Scope of utility model registration request] 1. A circular arc at both ends of a rotary lever in a driving device in which a pair of blades are linearly movably sandwiched between a pair of substrates having a light receiving opening so as to be linearly movable in relatively opposite directions. A diaphragm device that opens and closes the light receiving opening by linearly displacing by movement, wherein a guide slit is provided on each of the blades along the moving direction, and is provided on one of the substrates, and the guide slit is provided on each of the guide slits. In a diaphragm device provided with a guide pin that engages to guide the blade, two guide slits are sequentially provided on one side edge portion in a direction intersecting the moving direction of each blade along the moving direction of the blade. Of the guide slits provided on each of the blades, the guide slits on the far side of the guide slits on the far side of the guide slits on the far side from the drive device. It is characterized in that a rib is provided on the substrate at a position different from each of the guide pins engaged with the slits, and an edge portion on the other end side in the moving direction of the distant guide slit is in contact with the entire moving range. A diaphragm device.