JP3714852B2 - Light intensity adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light amount adjusting device such as a diaphragm device equipped in an optical apparatus such as a video camera, and more particularly to a light amount adjusting device including a filter for attenuating the light amount.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, a light amount adjustment filter of a light amount diaphragm device, generally an ND filter 14 (neutral density filter), is attached to an aperture blade 11 with an adhesive 15 as shown in FIG. The filter use surface 14a for attenuating the amount of light is pasted in a state where it protrudes from the opening 11a by a predetermined amount.
[0003]
The ND filter 14 is generally pasted using a pasting tool 40. As shown in FIG. 5A, the sticking jig 40 has a protruding step portion in which a positioning outer shape for determining the sticking position is formed by pressing the diaphragm blade 11 and the ND filter 14 by hand at the center thereof. 40a. (B) shows the state after the ND filter 14 is attached to the diaphragm blade 11. First, the opening 11 a of the diaphragm blade 11 is pressed by the protruding step 40 a of the jig 40 by hand. The ND filter 14 is placed on the protruding step portion 40a of the jig 40 while the state is maintained, and the position of the diaphragm blade 11 and the ND filter 14 is adjusted with one hand. While holding so as not to deviate, the adhesive 15 was applied to the bonding portion 14m of the ND filter 14 with another hand and joined to the aperture blade 11 in a procedure.
[0004]
[Problems to be solved by the invention]
However, in the method of using the above-mentioned sticking jig tool 40 and holding it by hand, one of the diaphragm blades 11 and the ND filter 14 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 the tool 40 is displaced from the positioning position or the adhesive 15 is unevenly dried and deviated from the initial attaching position. For this reason, there was a problem that proper light amount adjustment could not be performed.
[0005]
Therefore, the present invention can accurately determine the joining position without causing a positional shift between the diaphragm blade and the light quantity adjustment filter (ND filter), which are light quantity adjusting means, without causing a positional shift between the two, and perform appropriate light quantity adjustment. It is providing the light quantity adjustment apparatus which can be performed.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, a light amount adjusting device according to a first aspect of the present invention includes a light amount adjusting unit that opens and closes an opening to adjust the amount of light, and is attached to a predetermined position at the opening of the light amount adjusting unit. In the light amount adjustment device provided with the light amount adjustment filter attached thereto, the light amount adjustment unit and the light amount adjustment include a positioning means comprising a through hole or a notch for positioning the light amount adjustment unit and the light amount adjustment filter. Oite to both filters, at a position facing each moreover characterized in that provided at a position avoiding a partial wants the opening.
[0009]
According to the present invention, by providing positioning for attaching the hole portion or the notch portion to both the light amount adjusting means and the light amount adjusting filter, it is possible to perform attachment mounting without causing a positional shift without using a tool. In addition, the displacement can be regulated as compared with the case where it is simply applied to the tool, and the distortion and displacement of the light amount adjustment filter due to the load at the time of application can be suppressed.
[0010]
According to a second aspect of the present invention, in the light amount adjusting device according to the first aspect, the light amount adjusting means is provided with a plurality of the light amount adjusting means, and the hole or notch portion of the positioning means is attached with the light amount adjusting filter. It is characterized in that it is optically blocked by a light amount adjusting means other than the above.
[0011]
According to this invention, it is possible to prevent light leakage other than the opening due to the hole or the notch for positioning only by the light quantity adjusting means provided in plural.
[0012]
According to a third aspect of the present invention, in the light amount adjusting apparatus according to the first or second aspect , the hole or the notch of the positioning means is provided at a position where the light amount adjusting means and the light amount adjusting filter are opposed to each other. It consists of holes.
[0013]
According to the present invention, both the light amount adjusting means and the light amount adjusting filter are opposed to each other, and the hole portion or the notch portion serving as the tool hole is provided, thereby pressing both the light amount adjusting means and the light amount adjusting filter at the time of attachment. It can be easily pasted without it.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a light amount adjusting device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing a diaphragm device according to an embodiment of the present invention. The diaphragm device includes a light amount adjusting unit 10, a driving unit 20 that appropriately drives the light amount adjusting unit 10 to open and close, and a connection terminal unit 30 that supplies power to the driving unit 20 from an external device.
[0017]
The light amount adjusting unit 10 is attached to appropriate positions of the aperture blades 11 and 12 and the opening of the aperture blade 11, and covers the aperture when the captured light amount is strong. Density filter), projections 13b and 13c that slidably support the aperture 13a and the aperture blades 11 and 12 that open and close the opening 13a as appropriate, and bending fixing portions 13e and 13g that fix and support the drive unit 20 are formed. A ground plate 13 is provided.
[0018]
The drive unit 20 that opens and closes the light amount adjusting unit 10 as appropriate is extended from both sides of the drive unit 20 and a locking claw 23a that is locked by bending fixing portions 13e and 13g of the base plate 13, and is cut out from the base plate 13. Interlocking arms 22a and 22b that engage with the operating coupling slits 11s and 12s of the aperture blades 11 and 12 through the holes 13d and 13f, a conductive coil 24 in which a driving coil and a braking coil are wound around the outer peripheral portion 23, and the conductive coil 24, a lead terminal 25 for electrically pulling out each coil end, a magnet rotor 21 that is rotatably supported inside the casing and swings the interlocking arms 22a, 22b, and when the magnet rotor 21 is not in operation. A yoke 26 made of a C-shaped magnetic body with a partly side surface 26a for magnetically determining the position is cut.
[0019]
A connection terminal unit 30 for supplying power to the driving unit 20 from an external device and driving it appropriately connects each lead terminal 25 of the conductive coil 24 to an external power source to a support unit 31 soldered and fixed to the driving unit 20. The magnetic detection element 33 which detects the magnetic change of the electrode pattern 32 and the magnetic pole of the magnet rotor 21 and outputs a control signal for detecting the aperture opening amount at that time and controlling it to an appropriate aperture amount is provided.
[0020]
The diaphragm device having the above structure is mounted in a lens unit of an optical device such as a camera, and adjusts the light quantity by narrowing the light quantity passing through the opening 13a with the diaphragm blades 11 and 12. At that time, as the outside light brightness increases, the aperture is narrowed down, and the ND filter 14 enters the optical path from a predetermined amount of the aperture position, whereby the amount of light is transmitted and attenuated, and the aperture amount by the aperture blades 11 and 12 is increased, thereby causing a diffraction phenomenon. To prevent.
[0021]
Next, the attachment structure of the ND filter 14 provided on the diaphragm blade 11 of the diaphragm device will be described with reference to FIGS. 2A and 2B show a first embodiment of the attachment structure of the ND filter 14, where FIG. 2A shows a state before attachment, and FIG. 2B shows a state after attachment. As shown in the figure, the jig 40 has positioning pins 40b and 40c. The aperture blade 11 is formed with a hole 11b fitted into the positioning pins 40b and 40c and a long hole 11c, and the ND filter 14 is similarly fitted and positioned with the positioning pins 40b and 40c. A long hole 14c is formed. The ND filter 14 further includes a groove-shaped adhesive portion 14m formed so that the adhesive 15 does not flow out on the filter use surface 14a. As shown in the figure, the diaphragm blade 11 is set on the jig 40 and the ND filter 14 is superposed and held, and the adhesive portion 14 m of the ND filter 14 and the diaphragm blade 11 are joined using the adhesive 15. The adhesive 15 is left as it is for a while until it is dried to some extent, and is completely fixed without being displaced.
[0022]
FIG. 3 shows a second embodiment of the attachment structure of the ND filter 14, wherein (a) shows a state before attachment, and (b) shows a state after attachment. Unlike the above-described embodiment, this embodiment has a structure in which the ND filter 14 is directly attached to the aperture blade 11 without performing any processing on the jig 40. The jig 40 shown in the figure is an example used as a work table, and the jig 40 may not be used. The aperture blade 11 is formed with positioning projections 11h and 11i, while the ND filter 14 placed on the aperture blade 11 is formed with recesses 14d and 14e fitted to the projections 11h and 11i. The Further, similarly to the first embodiment, the adhesive portion 14n is formed on the filter use surface 14a so that the adhesive 15 does not flow out. The joining procedure is such that the concave portions 14d and 14e of the ND filter 14 face down and are superposed and held on the convex portions 11h and 11i for positioning the diaphragm blade 11, and the adhesive portion 14n of the ND filter 14 and the diaphragm are bonded using the adhesive 15. The blades 11 are bonded. Thereafter, the adhesive 15 is left to dry to some extent, and is completely fixed so as not to be displaced.
[0023]
FIG. 4 shows a third embodiment of a structure for attaching the ND filter 14, wherein (a) shows a state before attachment, and (b) shows a state after attachment. As in the second embodiment, this embodiment has a structure in which the ND filter 14 is directly attached to the diaphragm blade 11 and the jig 40 is used as a work table. The diaphragm blade 11 is formed with four positioning projections 11d, 11e, 11f, and 11g, and one ND filter 14 has a notch 14g, corresponding to the positioning projections 11d, 11e, 11f, and 11g. 14h, 14i, and 14j are formed. Further, similarly to the first and second embodiments, an adhesive portion 14m is provided so that the adhesive 15 does not flow out to the filter use surface 14a. As shown in the figure, the notch portions 14g, 14h, 14i, and 14j of the ND filter 14 are engaged with the positioning projections 11d, 11e, 11f, and 11g of the diaphragm blade 11 and held in an overlapped state as shown in the figure. The adhesive portion 14m of the ND filter 14 and the diaphragm blade 11 are adhered using the adhesive 15, and the adhesive 15 is left until it is dry, and is completely fixed without being displaced. Since the third embodiment has more engagement points than the second embodiment, the third embodiment can be joined in a more stable state and is less likely to be displaced.
[0024]
As in the embodiment shown in FIGS. 2 to 4 described above, it is possible to attach the ND filter 14 and the aperture blade 11 to the ND filter 14 and the diaphragm blade 11 with high accuracy and without causing any positional deviation. it can. And since the adhesion | attachment operation | work can also be performed easily, the reduction of a man-hour is achieved.
[0025]
Incidentally, the engaging member such as a hole or notch provided for positioning and joining the ND filter with respect to the light amount adjusting means is usually shielded by the other light amount adjusting means or the light amount adjusting means. Is prevented by a base plate that slidably supports the light and leaks into an opening of a camera or the like. In the above embodiment, the ND filter is attached to the diaphragm blade that narrows the opening diameter of the opening as the light amount adjusting means. However, the ND filter is simply attached to a member having a shape similar to that of the blade that takes in and out the opening. It may be attached.
[Brief description of the drawings]
FIG. 1 is a partially exploded perspective view of a light amount adjusting device according to the present invention.
FIG. 2 is a perspective view for explaining an ND filter attaching structure according to the first embodiment of the present invention.
FIG. 3 is a perspective view for explaining an ND filter attaching structure according to a second embodiment of the present invention.
FIG. 4 is a perspective view for explaining an ND filter attaching structure according to a third embodiment of the present invention.
FIG. 5 is a perspective view for explaining a conventional ND filter attaching structure;
[Explanation of symbols]
11 Aperture blade 11a Opening portion 14 Light quantity adjustment filters 14b and 14c Hole portion

Claims (3)

In a light amount adjustment device comprising: a light amount adjustment unit that opens and closes an opening to adjust a light amount; and a light amount adjustment filter that is attached to a predetermined position in the opening of the light amount adjustment unit.
Positioning means comprising a through-hole or cutout portion for positioning paste and said light amount adjusting means and the light intensity adjustment filter, Oite both light amount adjusting means and the light intensity adjusting filter, at positions facing each addition the A light amount adjusting device, characterized in that it is provided at a position avoiding a desired portion of the opening. A plurality of the light amount adjusting means are provided, and the hole or notch of the positioning means is optically blocked by a light amount adjusting means other than the light amount adjusting means to which the light amount adjusting filter is attached. The light quantity adjusting device according to claim 1 . The light quantity adjusting device according to claim 1 or 2, wherein the hole or notch of the positioning means comprises a tool hole provided at a position where the light quantity adjusting means and the light quantity adjusting filter are opposed to each other.

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