JP2525680Y2 - Light aperture device for camera - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a light amount diaphragm device for a camera.

[Conventional technology]

2. Description of the Related Art Conventionally, as a diaphragm device of a camera, for example, a video camera, there is one disclosed in Japanese Utility Model Application Laid-Open No. 59-4524. As shown in FIG. 12, this diaphragm device has an operating lever 3 having drive pins 321 and 322.
Drive device 310 with 20, aperture opening edge 363, guide holes 365, 367 provided on both side edges, elongated hole engaged with drive pin 321
An aperture blade 361 having a 369, an aperture opening edge 364, guide holes 366 and 368 provided on both side edges, an aperture blade 362 having an elongated hole 370 engaged with the drive pin 322, a light receiving aperture 331, and a guide hole 3
Guide pins 332,333,334,335 that engage with 65,366,367,368
And the diaphragm blades 361 and 362 are opened and closed via the driving pins 321 and 322 by the driving of the driving device 310.

[Problems to be solved by the invention]

However, this type of aperture device has a diametrically opposed 2
A circular motion in which the two drive pins 321 and 322 reciprocate at a rotation angle of less than 80 ° linearly translates the two diaphragm blades 361 and 362 relatively in the opposite direction, that is, converts the circular motion to a linear motion. Therefore, it is inevitable that a twist is applied to the aperture blades 361 and 362 which are vertically stacked. And diaphragm blade 361 on main plate 330
Are in direct contact with each other.
Large contact resistance with 30 prevents smooth opening and closing.

In addition, bulging portions are provided at the tops of the guide pins so that the blades 361, 362 do not separate from the guide pins 332, 333, 334, 335 during the movement of the blades.However, when the blades move, they do not catch on the bulging portions and do not perform a smooth opening / closing operation. There is.

Furthermore, during the assembling work, it is necessary to perform the assembly while positioning the swelling portion of the blade guide hole with the swelling portion, and the assembling work is troublesome.

Therefore, there is a drive device 310 provided on the back side of the base plate and a holding plate disposed on the top surface side of the base plate, with blades interposed therebetween.However, the height relationship between the drive pin and the holding plate and the guide pin and the holding plate If the height relationship is not taken into consideration, there is a risk that the blades will come off from these pins.

On the other hand, if the pressing plate is too close to the ground plate in order to prevent the blade from separating from each pin, the contact resistance between the flat surface of the pressing plate and the blade becomes large, and a smooth drawing operation may not be performed.

[Purpose of the invention]

This invention is a diaphragm device that opens and closes a light receiving opening by interposing a blade between a ground plate and a holding plate, and that the blade is detached from a drive pin that moves the blade and a guide pin that guides the movement of the blade. It is another object of the present invention to provide a camera aperture device capable of preventing and simultaneously converting the circular motion of the driving device into a relative linear motion of the aperture blade without waste, and capable of opening and closing smoothly and stably.

[Example of the invention]

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

<Configuration> In this embodiment, a diaphragm device will be described as an example of a camera opening / closing device. This diaphragm device is, as shown in FIGS. 1 to 5,
A guide plate, for example, a base plate 1, two diaphragm blades 3, 5 mounted on the ground plate 1, a guide plate, for example, a holding plate 7 for covering these diaphragm blades 3, 5, and a drive for driving the diaphragm blades 3, 5 Device 9.

As shown in FIG. 6, the base plate 1 includes a connector mounting portion 11, a light receiving opening 12 provided at the center, side walls 13 and 14 provided on both sides of the light receiving opening 12, and arc-shaped operation holes 15 and 16. , An arc-shaped projection 17 provided at the tip, and mounting holes 18, 1 of the driving device 9.
9, insertion hole 20, fixing hole 21, tip projections 22, 23, side wall
Guide members, e.g., guide pins 24, 25, 26, 27, which extend to the holding plate side on the sides 13, 14, and the operating holes 15, 16
Ribs 28, 29 provided on the outside of the light receiving opening 12, and protruding ribs 30, 31 provided from the inside of the operation holes 15, 16 in the outer peripheral direction of the light receiving opening 12.
And protruding ribs 32, 33 provided near the side walls 13, 14.
And a rib 34 provided at the center between the side walls 13 and 14, and protective projections 35 and 36 around the operation holes 15 and 16 as shown in FIG.

As shown in FIG. 6, pin holes 41 and 42 are
, Fixing holes 43, mounting holes 44, and mounting pins 45 shown in FIG.
Are provided.

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

The side walls 13 and 14 are provided with recesses 13A and 13B and 14A and 14B.

As shown in FIG. 6, the opening side guide pins 24 and 26 are located outside the drive section side guide pins 25 and 27 and are thinner than the drive section side guide pins 25 and 27.

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

As shown in FIG. 6, the protruding ribs 30, 31 have parallel portions 30A, 31A parallel to the side walls 13, 14, and inclined portions 30B, 31B inclined in the outer peripheral direction of the light receiving opening 12.

The protruding ribs 32, 33 are provided between the protrusions 22, 23 and the opening-side guide pins 24, 26 along the side walls 13, 14, and the moving-direction edges 51A, 57A of the opening-side long groove-shaped slits 51, 57 described later. For example, ribs 32A, 33A narrower than the width of the opening-side long groove-shaped slits 51, 57 with which
And ribs provided in a direction perpendicular to the ribs 32A and 33A and contacting the widthwise edges 51B and 57B of the opening-side long groove-shaped slits 51 and 57.
32B and 33B.

As shown in FIG. 9, the aperture blade 3 has an opening-side long groove parallel to the side edge engaging with the opening-side guide pin 24 and an opening-side long groove parallel to the side edge engaging with the drive unit-side guide pin 25. A drive-portion-side long groove-shaped slit 52 wider than the drive-portion slit 51; a drive-portion-side long groove-shaped slit 52 provided in a direction perpendicular to the moving direction of the diaphragm blade 3; An edge 54, an edge 97 having a smaller curvature than an arc portion 96 of the aperture blade 5, which will be described later, and facing the aperture opening edge 54;
And a filter 55 having a triangular shape.

The aperture opening edge 54 is provided with an arc portion 95 and an obtuse angle portion 60.

As shown in FIG. 7, when the diaphragm blade 3 is mounted on the main plate 1, the end of the diaphragm blade 3 facing the guide holes 51 and 52 does not contact the side wall 14.

The filter 55 has a mounting portion 62 as shown in FIG. 3 while the overlapping portion with the diaphragm blade 5 is cut in a straight line.
The diaphragm blade 3 is fixed with an adhesive.

As shown in FIG. 10, the aperture blade 5 engages with an aperture opening edge 56 provided at the center, a guide hole 57 parallel to a side edge engaging with the opening side guide pin 26, and a drive section side guide pin 27. A driving-unit-side long groove-shaped slit 58 wider than the guide hole 57 parallel to the side edge to be formed, and a width wider than the driving-unit-side long groove-shaped slit 58 provided in a direction perpendicular to the moving direction of the diaphragm blade 5. Hole 59
And

The aperture opening edge 56 is provided with an arc portion 96 and an obtuse angle portion 61.

When the diaphragm blade 5 is mounted on the main plate 1 as shown in FIG. 7, the width of the end portion facing the guide holes 57, 58 is set so as not to contact the side wall 13.

By the way, the aperture blade 5 is provided with an arc-shaped opening edge 56, and the aperture blade 3 is provided with an edge 97 having a smaller curvature than the opening edge 56 intersecting with the opening edge 56. Even when the edge 97 of the blade 3 intersects, the opening edge 56 and the edge 97 do not bite and can slide smoothly.

As shown in FIG. 8, the holding plate 7 has a light receiving opening 70 facing the light receiving opening 12 of the base plate 1, drive pin moving holes 71 and 72 facing the operation holes 15 and 16, and holes 18, 19, 20, 21. Holes 73, 74, 7 facing
5,76 and pin holes 77,7 facing the guide pins 24,25,26,27
8, 79, 80, ribs 81, 82 provided on the periphery of the drive pin moving holes 71, 72 and protruding toward the diaphragm blades 3, 5; and, like the ribs 81, 82, protruding toward the blades 3, 5 side. First protrusion-like ribs 83, 84 provided inside the drive pin moving holes 71, 72, and a drive unit side guide pin provided on a side portion between the light receiving opening 70 and the drive pin movement holes 71, 72. Second protruding ribs 85 and 86 extending from the hole 80 to the opening side guide pin hole 79 and from the drive unit side guide pin hole 78 to the opening side guide pin hole 77, respectively, along the moving direction of the blade.
And ribs 87, 88 provided on the tip side from the light receiving opening 70,
Engaging portions 89 and 90 having holes (not shown) that engage with the tip protrusions 22 and 23, and convex portions 93 that engage with the concave portions 13A, 13B, 14A and 14B.
A, 93B, 94A, 94B.

The holding plate 7 configured as described above engages the engaging portions 89 and 90 with the tip protrusions 22 and 23 of the base plate 1 as shown in FIG.
The screw 91 is screwed into the hole 21 and attached.

As described above, the diaphragm blades 81 and 82 around the drive pin moving holes 71 and 72 of the holding plate 7 and the first protruding ribs 83 and 84 provided between the drive pin moving holes 71 and 72 together therewith make the diaphragm blade.
The lifting of the apertures 3,5 is restricted, and the elongated holes 58,59 of the aperture blades 3,5 are prevented from coming off from the drive pins 121,122 described later.

In addition, the second protruding rib 85 between the opening side guide pin hole 77 facing the guide pins 24, 25 provided on the base plate and the drive unit side guide pin hole 78, and similarly faces the guide pins 27, 27. Opening side guide pin hole 79 to drive unit side guide pin hole
The second protruding rib 86 between the aperture blades 80 allows the aperture blades 3,5
The guide holes 51, 52, 57, 58 of the blades 3, 5 are prevented from coming off from the guide pins 24, 25, 26, 27 that guide the movement of the blades.
Further, each of these ribs is provided with a holding plate 7 and aperture blades 3,5.
It also has the function of reducing the contact resistance with the contact.

The base plate 1 is provided with tip projections 22 and 23, and the holding plate 7 is provided with engaging portions 89 and 90, so that the base plate 1 and the holding plate 7 are fitted at one end and fixed at the other end. Therefore, not only can the base plate 1 and the holding plate 7 be integrated, but also the tip projections 22 and 23 and the engaging portions 89 and 90 on the end faces do not hinder the insertion into the mounting holes of the lens barrel. And can be smoothly mounted on the lens barrel using the side walls 13 and 14 of the base plate 1 as guides.

As shown in FIG. 11, the driving device 9 includes an operating lever 100, a spring 101, a mounting cover 102, a cylindrical yoke 103, a magnet 105 having a rotating shaft 104, and a rotating shaft 1 having shaft holes 113 and 114.
A pair of bearing washers 106 and 107 supporting both sides of 04, a pair of coil frames 108 and 109 covering the magnet 105, a flexible cable 110 for wiring a magnetic sensing element (for example, a flat wiring sheet), and a flexible cable 111 for coil wiring
(For example, a flat wiring sheet) and the holding cover 112
And

The operating lever 100 includes a mounting portion 120 having a D-shaped insertion hole 120A into which the rotating shaft 104 is inserted, and elongated holes 53,5 of the diaphragm blades 3,5.
9 are respectively provided with driving pins 121 and 122 that engage with the holding members 123 and 124 that hold one end of the spring 101.
Reference numerals 1 and 122 are attached so as to extend from the base plate 1 side toward the moving holes 71 and 72 of the holding plate 7.

The mounting cover 102 includes columns 127 and 128 attached to the mounting holes 18 and 19 in FIG. 6, an insertion hole 129 facing the insertion hole 20, and
A pair of hooks 130 is provided, and columns 127 and 128 are fixed to the base plate 1 by screws 147 and 148 as shown in FIG.

At the tip of the rotating shaft 104, a mounting portion 104A having a D-shaped cross section with a partially cut peripheral surface is provided. Magnet 105
Are provided with a pair of magnetic field processing display grooves 132.

The coil frames 108 and 109 have the same configuration, and include a housing groove 133 for the magnet 105, a window 134 provided in the housing groove 133, and a housing groove 1.
33, shaft grooves 135 provided at both ends of the shaft 33, mounting grooves 136 for mounting washers 106 and 107 provided in the shaft grooves 135, and engagement holes 137.
, An engagement protrusion 138, a hook engagement groove 139, and a connection protrusion, for example, a metal pin 146. A coil is wound around the peripheral surface, and an end of the coil is wound around the pin 146, and solder Is attached.

The flexible cable 110 for magnetic sensing element wiring is formed in a sheet shape, for example, from synthetic resin, and faces the mounting portion 151 on which the magnetic sensing element 150 such as a Hall element for detecting the amount of rotation of the magnet 105 is attached, and the shaft groove 135. Hole 152 and the third
A connection portion 154 connected to the connector 153 shown in the figure and four wires 155 for power supply and output of the magnetic detection element 150 are provided.

The flexible cable 111 for coil wiring is formed of a synthetic resin sheet like the flexible cable 110 for magnetic detection element wiring, and has a hole 156 and a pin facing the shaft groove 135.
A mounting portion 158 having four mounting portions, for example, a pin hole 157, facing the 146, and a connecting portion 16 connected to the connector 159 in FIG.
0, and four wires 161 connected to both ends of the coil wound around the two coil frames 108, 109, and are mounted on the flexible cable 110 for wiring the magnetic sensing element.

Then, the flexible cables 110 and 111 are guided to the base plate 1 side along the peripheral surface of the yoke 103, and the tapes as shown in FIG.
Fixed at 165.

The connectors 153 and 159 are connected to the printed circuit board 1 as shown in FIG.
Attached to 62. The printed circuit board 162 has a fixing hole 163 facing the fixing hole 43 in FIG. 5, a hole facing the mounting hole 44, and a hole engaging with the mounting pin 45.
It is fixed to the connector mounting portion 11 by 4. Cover 112
Has a hook 172 which engages with the hook engaging groove 139, and is attached to the coil frames 108 and 109 as shown in FIGS.

<Operation> In such a configuration, the diaphragm device is inserted into the lens barrel of the camera across the optical path, the distal end is positioned by the protrusion 17, and fixed to the lens barrel via the holes 43 and 163 with screws. .

In such a state, when the aperture is set by a manual operation, the coil 145 is excited so that an output corresponding to the set value is obtained from the magnetic detection element 150.
As a result, the magnet 105 rotates, and the operating lever 100 rotates clockwise in FIG. For this reason, the drive pin shown in FIG.
121 and 122 move in the elongated holes 53 and 59 of the diaphragm blades 3 and 5, the diaphragm blade 3 moves to the right by being guided by the guide pins 24 and 25, and the diaphragm blade 5 is guided by the guide pins 26 and 27. Move to the left to form the set aperture.

Under photographing conditions in which the aperture blades 3 and 5 should be fully stopped down, the photographing light is filtered by the aperture
As a result, the amount of light is reduced. Therefore, the filter 55 does not use the aperture device with an extremely small aperture, and hunting of the driving device 9 and diffraction of light are avoided.

[Effect of the invention]

In short, the present invention is directed to a camera light amount aperture device that opens and closes the light receiving opening by supporting two blades movably in opposite directions relatively between a base plate having a light receiving opening facing each other and a holding plate. Since the protruding ribs are provided on the base plate before and after the diaphragm blade moving direction of the light-receiving opening on the ground plate side, contact resistance between the ground plate and the diaphragm blade is reduced, and fluttering and catching of the blade near the light-receiving opening can be prevented. .

Since the pressing plate has a protruding rib protruding toward the base end of the blade at the driving pin moving hole side of the pressing plate, the distance between the tip of the driving pin and the blade can be set with a margin. Separation of the blade from the pin can be prevented, and contact resistance between the holding plate and the blade in the vicinity can be reduced.

Since the pressing plate is provided with a protruding rib protruding toward the blade guided by the guide pin along the moving direction of the blade from the guide pin hole side of the drive unit side of the holding plate toward the opening side of the guide pin hole, The distance between the tip of the guide pin and the blade can be set with a margin, so that the blade can be prevented from separating from the guide pin, and the contact resistance between the holding plate and the blade in the vicinity can be reduced.

Therefore, it is possible to obtain a camera diaphragm device that prevents the blade from being detached from the drive pin for moving the blade and the guide pin for guiding the movement of the blade, and that can smoothly and stably open and close.

[Brief description of the drawings]

1 to 11 show one embodiment of the present invention.
Each figure represents the following: 1 is a front view of the drawing device, FIG. 2 is a bottom view of the drawing device, FIG. 3 is a rear view of the drawing device, FIG. 4 is a left side view of the drawing device, and FIG. 6 shows the structure of the main plate 1, FIG. 7 shows the state where the diaphragm blades 3, 5 are mounted on the main plate 1, and FIG. 8 shows the structure of the holding plate 7. 9 and 10 are diagrams showing the shapes of the two diaphragm blades 3 and 5, and FIG. 11 is a diagram showing the configuration of the driving device 9. FIG. 12 is a diagram for explaining the prior art. 1 ... ground plate, 3,5 ... aperture blades, 7 ... holding plate, 9 ...
... Drive device, 12 ... Light receiving aperture, 24,26 ... Open side guide pin, 25,27 ... Drive section side guide pin, 30,31,34 ... Base plate rib, 30A, 31A ... Parallel section, 30B , 31B …… Slope section, 51,5
7 …… Open-side long groove slit, 53 …… Long hole, 55 …… Filter, 52,58 …… Drive part side long groove slit, 59 …… Long hole, 70 …… Light-receiving opening, 77,78,79, 80 …… pin holes, 71,72…
... Driving pin moving holes, 81,82 ... Projecting ribs, 83,84 ... First projecting ribs, 85,86 ... Second projecting ribs, 100 ... Activating lever, 121,122 ... Drive pins

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-38425 (JP, A) JP-A 62-197134 (JP, U) JP-A 1-75225 (JP, U) JP-A 57-384 146125 (JP, U) JP-A 51-148944 (JP, U) JP-A 61-121429 (JP, U) JP-B 57-53575 (JP, B2) JP-B 59-32991 (JP, Y2) U.S. Pat. No. 3,938,168 (US, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A driving device in which two blades are linearly movable in a relatively opposite direction between a ground plate having a light receiving opening and a holding plate opposed to each other and are linearly movable in the opposite direction. In a camera light amount aperture device that opens and closes the light receiving opening by linearly displacing the both ends of the moving lever by an arc movement, the two light emitting blades engage with elongated holes respectively provided on a base end side in a movement direction of the two blades, A drive unit attached to an end of the base plate, the drive unit having an operation lever having drive pins at both ends extending from the base plate side to the holding plate side and moving the two blades by rotation; A pair of opening-side guide pins that are provided on the base plate extending toward the side and guide the blades on both sides in a direction intersecting with the blade moving direction of the light-receiving opening,
A drive section side guide pin that is located between the opening side guide pin and the drive section and guides the blades, and is formed along side edges of the two blades, and is formed on the opening side guide pin and the drive section side guide pin. An opening-side long groove-shaped slit and a driving unit-side long groove-shaped slit to be engaged with; a ground plate provided between the driving unit and the light receiving opening of the ground plate and between the light receiving opening and the driving unit opposite end; A projecting rib on the ground plate projecting from the flat surface to the blade side to separate the blade from the ground plate flat surface; a pair of drive pin moving holes formed on the holding plate and facing a moving drive pin region; Side guide pin,
A pair of opening-side guide pin holes and a drive unit-side guide pin hole respectively opposed to the drive unit-side guide pins, and the holding plate is moved by a drive pin from the flat surface of the holding plate on the drive pin moving hole side of the holding plate. A first protruding rib of a presser plate protruding from the base end side of the blade, and a drive unit side guide pin hole side between the drive pin moving hole of the presser plate and the presser plate side light receiving opening; And a second protruding rib of a holding plate that is provided in the moving direction of the blade from the front to the opening side guide pin hole side and protrudes from the flat surface of the holding plate toward the blade guided by the guide pin. Light amount aperture device for cameras.