JP3735272B2 - Diaphragm member and camera iris device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for adjusting a light amount of an aperture device used in a video camera, a still camera or the like.
[0002]
[Prior art]
Conventional diaphragm devices used in video cameras, still cameras, and the like, in order to prevent problems such as hunting of the opening / closing member and a decrease in resolving power due to diffraction phenomenon at the time of a small diaphragm, a light amount adjusting filter member, such as an ND filter It is well known that a (Neutral Density Filter) is provided.
[0003]
Further, simply disposing a member having a uniform light transmittance only slightly improves the degree of the small stop, and the relationship between the change amount of the incident light quantity with respect to the change amount of the stop at the small stop is not much. There has been proposed hunting of the opening / closing member and other difficulties, and the light transmittance of the ND filter is changed stepwise.
[0004]
In the camera aperture device, the light quantity adjusting filter member is attached to the opening / closing member, and the attaching means is also disclosed in Japanese Utility Model Publication No. 63-23697.
[0005]
Japanese Utility Model Laid-Open No. 5-55132 discloses a filter member for adjusting the amount of light having a plurality of steps of light transmittance, which is formed by superposing a plurality of sheet-like materials, on a single opening / closing member. ing.
[0006]
[Problems to be solved by the invention]
In such a sticking means, the adhesive penetrates into the close contact surface between the light quantity adjusting filter member and the opening / closing member or the close contact surface between the plurality of sheet-like light amount adjusting filter members stacked by capillarity. The phenomenon was happening.
[0007]
If the permeated portion is excessive, the adhesive B protrudes to the aperture opening 80 of the opening / closing member E1 as shown in FIG. 11 or FIG. 13 when the filter member 120 of FIG. 10 or FIG. Optical functions such as unnecessary reflection of light by the adhesive that oozes up to the end face and optical refraction by the adhesive that oozes into the aperture between the filter members for light quantity adjustment stacked on multiple sheets Caused damage.
[0008]
In particular, the close contact surfaces of the light quantity adjusting filter members stacked on a plurality of sheets are more smooth than the open / close member provided with fine irregularities on the surface to eliminate the gloss, and the degree of close contact is higher due to the capillary phenomenon. The penetration was significant.
[0009]
In order to eliminate such problems, conventionally, the application amount and viscosity of the adhesive have to be kept uniform, which is difficult to manage, and skill is required for manual bonding.
(See Figure 14)
An object of the present invention is to prevent hunting and other problems of the opening and closing member, and when sticking a single or a plurality of light quantity adjusting filter members with an adhesive, the adhesive does not protrude to the aperture opening due to permeation. An object of the present invention is to provide a diaphragm device for a camera using a means that allows easy management of adhesives and can be applied by hand without requiring skill.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a flat plate-shaped light amount adjusting filter member which is singly or plurally stacked, and a flat plate-shaped filter support member having a concave opening, and the filter member is at least The filter support member covers a part of the recess opening including the deepest part of the concave opening of the filter support member and is adhered to the filter support member with an adhesive at a predetermined distance from the opening end, and the filter member is attached to the filter support member From the side part which has the filter part which covers an opening side part and a part of said opening, and the sticking part stuck by an adhesive agent, and the said filter part and sticking part cover the said opening part of the said filter part It is a diaphragm member or a diaphragm apparatus of a camera that has a shape in which a portion up to the sticking portion is connected in a substantially V shape or a substantially U shape.
[0011]
[Action]
The filter member having the above shape prevents the penetration of the adhesive by increasing the distance from the sticking portion.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
1 and 2 are exploded perspective views of a camera diaphragm device according to an embodiment of the present invention applied to a video camera diaphragm device.
[0013]
As shown in FIG. 1, the diaphragm device E includes a blade driving unit 10 and a diaphragm unit 50 that is driven to open and close by the blade driving unit 10.
[0014]
As shown in FIG. 2, the diaphragm 50 covers a ground plate 51 to which the blade driving unit 10 is attached, a first opening / closing member, for example, a diaphragm blade E1, a second opening / closing member, for example, the diaphragm blade E2, and one surface of the ground plate 51. 51, a holding plate 70 that slidably holds the diaphragm blades E1 and E2 between them, an operating lever 90 that engages with the diaphragm blades E1 and E2 and transmits the driving force of the blade driving unit 10, and an operating lever 90 A biasing spring 95 that always biases and biases in one direction is provided.
[0015]
As shown in FIG. 1, the base plate 51 is fitted with an optical path opening 52, a mounting portion 53 of the blade driving unit 10, several engaging protrusions 55 a, 55 b, 56 a, 56 b formed on the mounting portion 53, and fitting Ribs 57a and 57b, a small hole 54 for penetrating the drive shaft, and locking projections 58a and 58b for holding the lead wire printed board 38.
[0016]
Note that an escape portion 52N is formed in the optical path opening 52 so as not to prevent movement of an ND filter 89 described later.
[0017]
Further, in order to allow the diaphragm blades E1 and E2 to move without sliding against each other on the base plate 51, the engagement pins 59a and 59b that are slidably engaged with the diaphragm blades E1 and E2 and the diaphragm blades E1 and E2 are floated. Protrusions 61a to 61h are provided.
[0018]
The operating lever 90 is provided with a hole 91 for fitting the drive shaft of the blade driving unit 10 and pin portions 92a and 92b that engage with the diaphragm blades E1 and E2.
[0019]
The aperture blade E1 is formed of a black polyester thin piece or the like, and as shown in FIG. 4, the aperture opening forming portion 80 for restricting the amount of light, the small hole 82 fitted to the pin portion 92b, and the engagement pin 59b are engaged. A long hole 83 is provided.
[0020]
On the other hand, the aperture blade E2 is also formed of a thin piece of black polyester, and the aperture opening forming portion 85 for restricting the amount of light, the small hole 87 that engages with the pin portion 92a, and the long hole that engages with the engagement pin 59a. 88 are provided. The aperture opening forming portion 85 forms the aperture opening F together with the aperture opening forming portion 80 of the aperture blade E1.
[0021]
A light quantity adjusting filter member such as an ND filter (Neutral Density Filter) 89 is attached to the deepest portion of the aperture opening forming portion 80 of the aperture blade E1.
[0022]
The holding plate 70 has an optical path opening 71, elongated holes 72a and 72b formed so that the pin portions 92a and 92b of the operating lever 90 can rotate, coupling portions 74a and 74b coupled to the base plate 51, and engagement pins. Holes 75a and 75b facing 59a and 59b and protrusions 62a to 62d for floating the diaphragm blades E1 and E2 are provided.
[0023]
The optical path opening 71 is formed with an escape portion 71N so as not to hinder the movement of the ND filter 89 when the diaphragm blade E2 is attached to the ND filter 89.
[0024]
Next, the configuration of the blade driving unit 10 will be described.
[0025]
The blade drive unit 10 includes a permanent magnet body 11 pivotally supported at the center as shown in FIG. 1, a coupling-side bobbin 14 and a pin-side bobbin 25 surrounding the permanent magnet body 11, and as shown in FIG. The drive coil 130A and the brake coil 130B wound around the bobbins 14 and 25, and the hollow cylindrical magnetic circuit member (yoke) that is fitted on the outer periphery of the bobbins 14 and 25 and guides the magnetism of the permanent magnet body 11 35, an end plate 36 that presses the end of the magnetic circuit member 35, and a magnetic sensor 37 that detects the rotational angle position of the permanent magnet body 11, and is connected to the magnetic sensor 37 and the coils 130A and 130B. It is comprised from the conducting wire printed board 38. FIG.
[0026]
The permanent magnet body 11 is composed of a cylindrical magnet 12 and a drive shaft 13 fixed through the cylindrical center of the magnet 12, and is pivotally supported inside a bobbin 14 and a bobbin 25. Yes.
[0027]
Terminal pins 29a, 29b, 29c, and 29d for winding the wire ends of the coils 130A and 130B are provided on the top of the bobbin 25.
[0028]
Then, the magnetic circuit member 35 is fitted and the end plate 36 is covered, and then, the terminal pins 29a, 29b, 29c, and 29d are placed through the four small holes formed in the conductive wire printed board 38.
[0029]
Finally, the terminal pins 29a, 29b, 29c, 29d and the conductive wire printed board 38 are coupled with solder or the like, whereby the assembly of the blade driving unit 10 is completed.
[0030]
The ND filter 89 in this embodiment is disposed at the deepest concave portion of the aperture forming portion 80 of the aperture blade E1 as shown in FIG. 5, and is substantially U-shaped along the concave shape of the aperture forming portion, and is predetermined from both sides. It is connected to the sticking part at a distance.
[0031]
In addition, since this ND filter shape is a shape that supports both sides covering the opening from the sticking part, the decrease in the support strength of the ND filter is minimized, and the distance from the sticking part to the opening is increased. 9, the penetration part of the adhesive is prevented from reaching the opening forming part 80.
[0032]
Further, the ND filter has a substantially U-shaped central portion cut as shown in FIG. 6, and an end portion of the ND filter may be adhesive, or a substantially V-shaped shape as shown in FIG. 7. It may be in shape.
[Second Embodiment]
As shown in FIG. 8, even if a plurality of ND filter materials are laminated and pasted, the penetration of the adhesive on the contact surfaces between the ND filters and between the ND filters and the diaphragm blades is caused in the openings. To prevent it from reaching.
[Other Examples]
Although not shown in the drawings, the present invention is not limited to the above-described embodiment. In the above-described embodiment, adjacent opening / closing members are moved in opposite directions relative to each other, and formed by the aperture opening forming portion of the opening / closing member. The aperture device that changes the size of the aperture that can be applied to a filter driving member that does not contribute to the aperture forming portion.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing the overall structure of a diaphragm device for a camera according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of the throttle portion of FIG.
3 is an exploded perspective view showing a structure of a blade driving unit in FIG. 1. FIG.
4 is a plan view excluding the pressing plate of FIG. 2;
FIG. 5 is an explanatory diagram of a configuration of a light amount adjusting filter member and an opening / closing member in FIG. 2;
FIG. 6 is an explanatory view showing another example of the light quantity adjusting filter member.
FIG. 7 is an explanatory view showing another example of the light quantity adjusting filter member.
FIG. 8 is an explanatory diagram of a second embodiment.
FIG. 9 is an explanatory view showing a range in which the adhesive of the present invention permeates.
FIG. 10 is an explanatory diagram of a filter member for adjusting light quantity in a conventional example.
FIG. 11 is an explanatory view showing a range in which the adhesive penetrates.
FIG. 12 is an explanatory diagram of a light quantity adjusting filter member that is stacked in two cases in a conventional case.
FIG. 13 is an explanatory view showing a range in which the adhesive penetrates.
FIG. 14 is an explanatory diagram of manual bonding.
[Explanation of symbols]
B Adhesive E Camera diaphragm device E1 Diaphragm blade 80 Opening forming portion 89 Light quantity adjusting member (ND filter) (first embodiment)
110 Light quantity adjusting member (ND filter) (second embodiment)

Claims (4)

Consists of a plate-shaped light intensity adjustment filter member, a plate-shaped filter support members having a concave shape opening,
The filter member covers at least a part of the recessed opening including the deepest part of the recessed opening of the filter supporting member and is adhered to the filter supporting member by an adhesive at a predetermined distance from the opening end,
The filter member has a filter part that covers the filter support member opening side part and a part of the opening, and a sticking part that is stuck by an adhesive, and the filter part and the sticking part are formed of the filter part. A diaphragm member characterized by forming a shape in which a part from both sides covering the opening to a sticking part is connected in a substantially V-shape or a substantially U-shape. The diaphragm member according to claim 1, wherein at least two of the light quantity adjusting filter members are stacked and attached to the filter support member. In a camera diaphragm device equipped with a diaphragm member for light quantity adjustment,
The diaphragm member is
It consists of a flat plate-shaped light amount adjusting filter member and a flat plate-shaped filter support member having a concave opening,
The filter member covers at least a part of the recessed opening including the deepest part of the recessed opening of the filter supporting member and is adhered to the filter supporting member by an adhesive at a predetermined distance from the opening end,
The filter member has a filter part that covers the filter support member opening side part and a part of the opening, and a sticking part that is stuck by an adhesive, and the filter part and the sticking part are formed of the filter part. An aperture device for a camera, characterized in that a shape in which both sides covering the opening and a sticking portion are connected by a substantially V-shape or a substantially U-shape . The diaphragm device for a camera according to claim 3, wherein at least two of the light quantity adjusting filter members are stacked and adhered to the filter support member .

Images