JP3145531U - Mounting structure of optical filter to diaphragm blade - Google Patents

Abstract

An optical filter can be accurately positioned with respect to a diaphragm blade only by providing a minimum number of positioning means, thereby simplifying the shape of the optical filter and the diaphragm blade and facilitating the filter mounting operation. An optical filter mounting structure for an aperture blade that can be easily realized is provided.
An attachment structure in which an ND filter is bonded to an aperture blade, and the ND filter is formed in a substantially rectangular planar shape having a front end edge, a left and right side edge, and a rear end edge as outer peripheral edges. A pair of left and right U-shaped notches 26 are formed on the left and right side edges of the ND filter, and the diaphragm is engaged with the U-shaped notch of the optical filter to position the optical filter in the front-rear direction and the left-right direction. Forming a convex part 16 to be formed, and forming the convex part as a substantially hemispherical convex part by pressing a resin thin plate as a material from the back side to the front side, and engaging the notch with the convex part. Then, the optical filter was positioned with respect to the diaphragm blade, and in this state, the optical filter was adhered to the diaphragm blade by applying an adhesive to the rear edge of the optical filter.
[Selection] Figure 1

Description

  The present invention relates to an optical filter mounting structure when an optical filter is mounted on a diaphragm blade incorporated in a diaphragm device for an optical apparatus such as a video camera, a still camera, or a surveillance camera.

  In a diaphragm device for adjusting the amount of light, the amount of movement of the diaphragm blades for adjusting the same amount of light decreases as the diameter of the diaphragm decreases. Therefore, it is necessary to control the movement of the diaphragm blade with higher accuracy, and the control becomes difficult. Therefore, when the aperture diameter is small, an optical filter (light quantity attenuation filter = ND filter) that restricts the amount of light passing through is inserted into the aperture opening, and the substantial aperture diameter is enlarged to reduce the aperture diameter. The device is designed to increase the control resolution.

  Specifically, a small piece of ND filter is attached to the aperture side of the aperture blade, and when the aperture blade falls below a predetermined aperture diameter, the ND filter is positioned within the aperture diameter so as to control the amount of light passing therethrough. It is configured.

  This ND filter is usually attached to the diaphragm blade with an adhesive, and is attached with a filter usage surface for attenuating the amount of light from the edge of the aperture section of the diaphragm blade protruding into the aperture. Yes.

  5 (a), 5 (b) and FIGS. 6 (a), 6 (b) are explanatory views of a conventional ND filter mounting method described in Patent Document 1. FIG.

  In the method shown in FIG. 5, the ND filter is pasted using a pasting tool. As shown in FIG. 5A, the sticking jig 140 has a protruding step 141 that determines the position of the edge of the opening 111 of the diaphragm blade 110 and the edge 121 of the ND filter 120 at the center. Have.

  FIG. 5B shows a state after the ND filter 120 is attached to the diaphragm blade 110, and the attachment is performed according to the following procedure. First, the opening 111 of the aperture blade 110 is fixed to the protruding step 141 of the jig 140 while being held by hand, and the ND filter 120 is stacked on the protruding step 141 of the jig 140 while maintaining the state. To be placed. Then, while holding the diaphragm blade 110 and the ND filter 120 so that the positions of the diaphragm blade 110 and the ND filter 120 do not shift with one hand, apply the adhesive S to the range including the concave portion 125 for bonding the ND filter 120 with the other hand. The diaphragm blade 110 is joined.

  However, in the method that is performed by holding the above-described sticking jig 140 by hand, one of the diaphragm blades 110 and the ND filter 120 that are often overlapped at the time of bonding is caused by hand shake or the like. It has been difficult to ensure accurate positional accuracy because it has shifted from the positioning position 140, or the adhesive S has unevenness in its drying and shifted from the initial attachment position.

Therefore, as shown in FIG. 6A, four protrusions 216 and 217 are provided on the surface of the diaphragm blade 210 around the opening 211, and these four protrusions 216 and 217 are provided in FIG. 6B. As shown, the ND filter 220 is positioned with respect to the aperture blade 210 by fitting the four notches 226 and 227 provided in the front edge portion and the rear edge portion of the rectangular ND filter 220 in correspondence with each other, In this state, a structure has been proposed in which the diaphragm blade 210 and the ND filter 220 are joined by applying the adhesive S to a range including the adhesive recess 225 at the rear edge of the ND filter 220.

JP 2001-356386 A

  However, in the case of the mounting structure of FIG. 6, the ND filter 220 needs to be positioned in four directions, front, rear, left, and right with respect to the diaphragm blade 210, so that the four notches 226, 227 are connected to the four protrusions 216, 217. Although it is made to engage while aligning, since there are many positions of positioning, there was a possibility that it might be troublesome to align a position. Further, since the number of the protrusions 216 and 217 and the notches 226 and 227 is large, the shape of the aperture blade 210 and the ND filter 220 is complicated, which may increase the cost. In addition, it is difficult to form the small protrusions 216 and 217 on the surface of the diaphragm blade 210 made of a very thin material, which is difficult to realize.

  In consideration of the above circumstances, the present invention can accurately position the optical filter with respect to the diaphragm blades only by providing a minimum number of positioning means, thereby simplifying the shape of the optical filter and the diaphragm blades and the filter. An object of the present invention is to provide an optical filter mounting structure for a diaphragm blade that can be easily mounted and can be easily realized.

  According to the first aspect of the present invention, a convex portion is formed on the surface of a diaphragm blade made of a resin thin plate that adjusts the amount of light, and on the other hand, a small piece of optical filter made of resin thin plate for attenuating the amount of light attached to a part of the diaphragm blade. A notch is formed in the outer peripheral edge, and the optical filter is positioned with respect to the diaphragm blade by engaging the notch with the convex portion. In this state, the optical filter is attached to the diaphragm blade. An optical filter mounting structure, in which the optical filter is an outer peripheral edge, the side protruding toward the center of the opening is the front, the opposite side is the rear, and the direction perpendicular to the front-rear direction is the left-right direction A substantially rectangular plane shape having a front edge, a left and right side edge, and a rear edge, and a pair of left and right U-shaped notches are formed on the left and right side edges of the optical filter, The optical filter By engaging with a U-shaped notch, the convex portion for positioning the optical filter in the front-rear direction and the left-right direction is formed, and the convex thin resin plate as a material is directed from the back side to the front side. The optical filter is formed as a substantially hemispherical convex portion by pressing, and the notch is engaged with the convex portion to position the optical filter with respect to the diaphragm blade, and in this state, the rear end of the optical filter The optical filter is bonded to the diaphragm blade by applying an adhesive to the edge.

  The invention of claim 2 is an optical filter mounting structure for the diaphragm blade according to claim 1, wherein the U-shaped notch of the optical filter is formed symmetrically.

  The invention of claim 3 is an optical filter mounting structure for the diaphragm blade according to claim 1 or 2, wherein the diameter of the corner where the outer peripheral edge of the substantially hemispherical convex portion and the surface of the diaphragm blade intersect. The width of the U-shaped notch is set to be slightly larger than that, and the optical filter is positioned with respect to the aperture blade by the contact between the corner and the lower end of the inner surface of the notch. .

The invention of claim 4 is an optical filter mounting structure for the diaphragm blade according to any one of claims 1 to 3, wherein the U-shaped notch on the left and right side edges of the optical filter is a first notch. And when the convex portion corresponding to the first notch is a first convex portion, a second U-shaped notch is further formed on the rear edge of the optical filter, and the diaphragm blades, A second convex portion that fits into the second U-shaped notch is provided, and the second convex portion is formed into a substantially hemispherical shape by pressing a resin thin plate that is a material from the back side to the front side. The optical filter is positioned with respect to the aperture blade by forming the convex portion and engaging the first notch with the first convex portion, and the second convex portion with the second convex portion. A U-shaped notch is fitted, and in this state, the second U-shaped notch and the second notch By applying adhesive to a range including the part, characterized by being bonded to the diaphragm blade the optical filter.

  According to the first aspect of the present invention, the optical filter can be accurately positioned in the front-rear direction and the left-right direction with respect to the diaphragm blades only by providing a minimum number of positioning means (combination of convex portions and notches). Accordingly, it is possible to simplify the shapes of the optical filter and the diaphragm blades, and it is possible to facilitate the mounting operation by the amount of the portions where the convex portions and the notches are aligned. Further, since the optical filter can be attached so as not to be displaced, the size of the optical filter can be set to the minimum necessary, and the yield when using an expensive filter material can be improved. In addition, since the optical filter is adhered to the diaphragm blade by applying an adhesive to the rear edge of the optical filter, it is possible to prevent adverse effects on the optical system due to the protrusion of the adhesive. Moreover, since the convex part of the aperture blade is formed by pressing the resin thin plate from the back side to the front side, the convex part can be formed by a simple processing method and is easy to realize.

  According to the invention of claim 2, since the U-shaped notch of the optical filter is formed symmetrically, the optical filter can be positioned and bonded and fixed to the diaphragm blade regardless of the front and back, and the mounting workability is improved. I can plan.

  According to the third aspect of the invention, the optical filter is lifted by obtaining the dimensional accuracy of the corner where the outer peripheral edge of the substantially hemispherical convex portion formed on the surface of the diaphragm blade and the surface of the diaphragm blade intersect. And firmly adhere to the surface of the diaphragm blade in close contact.

  According to the fourth aspect of the present invention, the second U-shaped notch formed on the rear edge of the optical filter is fitted to the second convex portion of the aperture blade, and the second U-shaped notch is fitted. Since the adhesive is applied to the range including the second convex part and the optical filter is adhered to the diaphragm blade, the second convex part and the U-shape are different from the adhesive only on the flat part. Since the adhesive is placed on a portion where a large number of undulations are continuously applied by the notch, the adhesion between the optical filter and the diaphragm blade can be made more reliable.

Embodiments of the present invention will be described below with reference to the drawings.
1A and 1B are diagrams showing the relationship between an aperture blade and an ND filter (optical filter). FIG. 1A is a perspective view showing a state before the ND filter is positioned on the aperture blade, and FIG. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1B, FIG. 3 is a perspective view showing a state where the ND filter is attached to the diaphragm blade with an adhesive, and FIG. It is a disassembled perspective view which shows the whole aperture | diaphragm | squeezing apparatus comprised incorporating the aperture blade.

As shown in FIG. 1, the aperture blade 10 is provided with an opening 11 for adjusting the amount of light, a slide groove 12 for sliding, and a drive groove 13 for driving. Further, in the peripheral portion of the opening 11, three convex portions 15, 16, 16 swelled on the surface side are provided in the vicinity of the portion that defines the aperture diameter when the aperture diameter is reduced. Here, out of the three convex portions 15, 16, 16, two symmetrical convex portions 16, 16 on the side close to the opening 11 are referred to as a first convex portion 16, and the remaining one convex portion is referred to as a first convex portion. Two convex portions 15 are distinguished. Here, the front-rear direction refers to a direction away from the center of the opening 11, and the left-right direction refers to a direction orthogonal thereto.

  The diaphragm blade 10 is made of a material called a carbon feather (trade name) which has a very thin (for example, 0.068 mm) light-shielding polyethylene film and has a smooth surface by roughing the surface by fine surface matting (sand blasting). The three convex portions 15, 16, and 16 are formed as substantially hemispherical convex portions by pressing a resin thin plate (film) as a material from the back surface side to the front surface side. .

  On the other hand, the ND filter (optical filter) 20 for attenuating the amount of light attached to a predetermined part of the diaphragm blade 10 is made of a material obtained by coating a light-reducing substance on the surface of a very thin polyethylene film having a thickness of about 0.15 mm, for example. Thus, the outer peripheral edge is formed in a substantially square piece having a front edge 21, a left and right side edge 22, and a rear edge 23.

  A pair of left and right U-shaped first notches 26 are formed symmetrically on the left and right side edges 22 of the ND filter 20, and a second U-shaped notch 25 is formed on the rear end edge 23 of the ND filter 20. Only one is formed. The first notch 26 on the left right edge 22 is fitted into the first convex portion 16 of the diaphragm blade 10, and the two left and right pairs of the notch 26 and the convex portion 16 are fitted to the diaphragm blade 10. Thus, the ND filter 20 can be positioned in the front-rear direction and the left-right direction. Further, the second notch 25 of the rear end edge 23 is fitted into the second convex portion 15 of the diaphragm blade 10, so that the pair of the notch 26 and the convex portion 16 of the left and right side edges 22 can be supplemented. The ND filter 20 can be positioned with respect to 10.

  In this case, the relationship between the substantially hemispherical convex portions 15 and 16 and the cutouts 25 and 26 is such that the outer peripheral edges of the convex portions 15 and 16 and the diaphragm blades, as shown in FIG. The widths 25H and 26H of the U-shaped cutouts 25 and 26 are set to be slightly larger than the diameters 15D and 16D of the corners at which the surface of the corner 10 intersects. The optical filter 20 is positioned with respect to the aperture blade 10 by the contact of the lower end of the inner surface. That is, by accurately measuring the corners of the raised portions 15 and 16 that are raised on the surface of the diaphragm blade 10, the ND filter 20 can be accurately positioned without being lifted up and in close contact with the surface of the diaphragm blade. I am doing so.

  When the ND filter 20 is attached to the diaphragm blade 10, an adhesive is previously applied in the vicinity of the second convex portion 15 of the diaphragm blade 10, and the ND filter 20 is placed on the diaphragm blade 10 in this state. As shown in FIG. 1 (b), the first notch 25 of the ND filter 20 is fitted into the first convex portion 16 of the diaphragm blade 10, and the ND filter 20 is coupled to the second convex portion 15 of the diaphragm blade 10. The second notch 26 is fitted. By doing so, the positioning of the ND filter 20 is completed, and in this state, the adhesive S is again applied to the range including the second notch 25 and the second convex portion 15 at the rear edge from the top of the ND filter 20. Applying and bonding the ND filter 20 to the surface of the diaphragm blade 10. Thus, the diaphragm blade 10 with the ND filter 20 as shown in FIG. 3 is completed.

  After that, as shown in FIG. 4, in combination with the diaphragm blade 10B to which the ND filter 20 is attached in the same manner as in the other pair, it is placed on the diaphragm substrate 40, and the slide groove 12 is formed on the pin 42 on the diaphragm substrate 40. By fitting, the two diaphragm blades 10 and 10B are slidably assembled. At the same time, the rotary lever 53 of the drive unit 50 is engaged with the drive grooves 13 of the aperture blades 10 and 10B, and a cover (not shown) is placed on the aperture substrate 40, thereby completing the aperture device 60. Can do.

As described above, according to the mounting structure of the ND filter of the present embodiment, only a minimum number of positioning means (a combination of the two left and right first convex portions 16 and the first notch 25) is provided.
The D filter 20 can be accurately positioned with respect to the diaphragm blade 10 in the front-rear direction and the left-right direction. Accordingly, the shapes of the ND filter 20 and the diaphragm blade 10 can be simplified, and the mounting work can be facilitated by the amount of the portions where the convex portions 16 and the notches 26 are aligned. Further, since the ND filter 20 can be mounted so as not to be displaced, the size of the ND filter 20 can be set to the minimum necessary, and the yield can be improved when using an expensive filter material.

  In addition, since the ND filter 20 is bonded to the diaphragm blade 10 by applying the adhesive S to the rear edge 23 of the ND filter 20, the adverse effect on the optical system due to the protrusion of the adhesive S does not occur. can do. Moreover, since the convex part 16 of the aperture blade 10 is formed by pressing the resin thin plate from the back side to the front side, the convex part 16 can be formed by a simple processing method and easy to realize. It is.

  Further, since the first cutouts 26 of the ND filter 20 are formed symmetrically, the ND filter 20 can be positioned and bonded and fixed to the diaphragm blades 10 regardless of the front and back sides, and the mounting workability can be improved.

  In addition, since the ND filter 20 is positioned in the front-rear and left-right directions by the combination of the two sets of the first convex portion 16 and the first notch 26, from the viewpoint of positioning, the second convex portion 15 and the second notch 25 are provided. However, by providing the second protrusion 15 and the second notch 25, it is possible to improve the adhesion so as to be particularly resistant to peeling.

  That is, in a state where the second U-shaped notch 25 formed on the rear edge 23 of the ND filter 20 is fitted to the second convex portion 15 of the diaphragm blade 10, the second U-shaped notch 25 and Unlike the case where the adhesive S is simply placed on a planar portion by applying the adhesive S to the range including the second convex portion 15 and adhering the ND filter 20 to the diaphragm blade 10, the second convex portion Since the adhesive S is placed on a portion where a large number of undulations are continuously attached by the 15 or the U-shaped notch 25, the ND filter 20 and the diaphragm blade 10 can be more reliably bonded. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the relationship between the aperture blade of embodiment of this invention, and an ND filter (optical filter), (a) is a perspective view which shows the state before positioning an ND filter to an aperture blade, (b) is an aperture of an ND filter. It is a perspective view which shows the state after positioning to a blade | wing. It is II-II arrow sectional drawing of FIG.1 (b). It is a perspective view which shows the state which affixed the ND filter on the aperture blade with the adhesive agent. It is a disassembled perspective view which shows the whole aperture | diaphragm | squeezing apparatus comprised incorporating the aperture blade. (A), (b) is explanatory drawing of the attachment method of the conventional ND filter. (A), (b) is explanatory drawing of the attachment structure of the conventional ND filter.

Explanation of symbols

10, 10B Aperture blade 11 Opening portion 15 Second convex portion 16 First convex portion 20 ND filter (optical filter)
25 Second notch 26 First notch S Adhesive

Claims (4)

A convex portion is formed on the surface of the diaphragm blade made of resin thin plate for adjusting the amount of light, while a notch is formed on the outer peripheral edge of a small piece of optical filter made of resin thin plate for attenuation of light amount attached to a part of the diaphragm blade. The optical filter is positioned with respect to the diaphragm blade by engaging the notch with the convex portion, and in this state, the optical filter is attached to the diaphragm blade with the optical filter bonded to the diaphragm blade. And
When the optical filter is an outer peripheral edge, the front side is the front side, the opposite side is the rear side, and the direction perpendicular to the front-rear direction is the left-right direction. Formed into a substantially rectangular planar shape having a rear edge,
Forming a pair of left and right U-shaped notches on the left and right side edges of the optical filter;
On the other hand, by engaging the U-shaped notch of the optical filter on the diaphragm blade, the convex portion for positioning the optical filter in the front-rear direction and the left-right direction is formed,
The convex part is formed as a substantially hemispherical convex part by pressing a resin thin plate as a material from the back side to the front side,
By engaging the notch with the convex portion, the optical filter is positioned with respect to the diaphragm blade, and in that state, an adhesive is applied to the rear edge of the optical filter, so that the optical filter is A structure for attaching an optical filter to an aperture blade, which is bonded to the aperture blade.   2. The optical filter mounting structure for an aperture blade according to claim 1, wherein the U-shaped notch of the optical filter is formed symmetrically.   The width of the U-shaped notch is set slightly larger than the diameter of the corner where the outer peripheral edge of the substantially hemispherical convex portion and the surface of the aperture blade intersect, and the corner and the inner surface of the notch The structure for mounting an optical filter on an aperture blade according to claim 1 or 2, wherein the optical filter is positioned with respect to the aperture blade by abutment of a lower end. When the U-shaped cutouts on the left and right side edges of the optical filter are first cutouts, and the convex portions corresponding to the first cutouts are the first convex portions,
A second U-shaped notch is further formed on the rear edge of the optical filter, and the diaphragm blade is provided with a second convex portion that fits into the second U-shaped notch,
The second convex part is formed as a substantially hemispherical convex part by pressing a resin thin plate as a material from the back side to the front side,
By engaging the first notch with the first convex part, the optical filter is positioned with respect to the diaphragm blade, and the second U-shaped notch is provided on the second convex part. Mating,
In this state, the optical filter is bonded to the diaphragm blade by applying an adhesive to a range including the second U-shaped notch and the second convex portion. 4. An optical filter mounting structure for the diaphragm blades according to any one of items 3 to 4.

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