JP3538740B2 - Light shielding member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding member, and more particularly to a light-shielding member for maintaining optical equipment in a light-tight state.

[0002]

2. Description of the Related Art In an optical apparatus such as a film pack holder, a light shielding member is used to maintain a sheet film unit housed therein in a light-tight state. Such a light shielding member has a leaf spring 1 as a core material as shown in FIG.
A light shielding cloth 2 is adhered to the leaf spring 1.

[0003]

However, in the conventional light shielding member, since the spring piece 3 of the leaf spring 1 is a flat plate, if the surface of the mating member with which the light shielding member comes into contact is inclined, there is a portion that does not contact the mating member. There is a disadvantage that external light enters through the gap between the portions. In addition, since the spring piece 3 of the leaf spring 1 is a flat plate, the front edge 2A of the light shielding cloth 2 comes into contact with the surface of the mating member. As a result, in the conventional light-shielding member, the frictional force generated when the partner member slides and moves is concentrated on the front edge 2A of the light-shielding cloth 2, so that the front edge 2A wears out early and reduces the light-shielding property. There are drawbacks.

[0004] The present invention has been made in view of such circumstances, and has as its object to provide a light-shielding member capable of improving light-shielding properties.

[0005]

According to the present invention, there is provided a light shielding member comprising a leaf spring member as a core material and a light shielding cloth adhered to a surface of the leaf spring member. The spring member is characterized in that its tip is divided into a comb shape and is curved. In order to achieve the above object, the present invention provides a holder body having an opening for photographing, and a sheet film unit disposed slidably in the holder body and housed therein, in a light-tight state. A light-shielding member attached to a film pack holder having a slide frame having a sliding lid for maintaining the light-shielding member, wherein the light-shielding member is formed by using a leaf spring member having a distal end formed in a comb shape and having a curved shape as a core material. A light-shielding cloth is attached to a surface of the leaf spring member, and the light-shielding member is at least one of a sliding portion between the holder main body and the lid and a sliding portion between the holder main body and the slide frame. It is characterized in that it is attached to one side.

[0006]

According to the first aspect of the present invention, since the distal end of the leaf spring member is formed in a comb shape, the leaf spring member is tilted even if the counterpart member with which the leaf spring member contacts is inclined. And contact the opposing member without gaps. Further, in the present invention, since the leaf spring member is formed in a curved shape and the contact area with the mating member is increased, the wear of the light shielding cloth is reduced.

According to a second aspect of the present invention, there is provided a light-shielding member attached to a film pack holder. The light-shielding member is formed by using a leaf spring member having a comb-shaped tip and a curved portion as a core material. A light-shielding cloth is attached to the surface of the member, and the light-shielding member is attached to at least one of the sliding portion between the holder body and the sliding lid of the film pack holder and the sliding portion between the holder body and the sliding frame. Thus, the light-shielding property of the film pack holder is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a light shielding member according to the present invention will be described below in detail with reference to the accompanying drawings. First, a film pack mounted on a film pack holder to which the light shielding member of the present invention is attached will be described. As shown in FIG. 1, a film pack 10 has a cap 12 removably attached to a front end portion of a box-shaped pack body 14, and a plurality of sheet film units 16 in the pack body 14.
Are stacked and stored. A lid 20 with a handle 18 for opening and closing the opening 14A is attached to an opening 14A formed on the front surface of the pack body 14. The lid 20 is larger in size than the sheet film unit 16, and slides along a groove 22 formed in the inner surface of the side wall of the pack body 14 when pushed and pulled with the handle 18.

As shown in FIG. 2, a claw member 24 urged upward is provided inside the cap 12, and a pair of claws 26, 26 formed on the claw member 24 are provided on the tip end side of the lid 20. The lid 20 is locked to the cap 12 by engaging with the formed locking holes 28, 28 (see FIG. 1). On the back surface of the lid 20, a projection 30 is formed on the handle 18 side, which engages with the step 31 of the pack body 14 to prevent the lid 20 from moving toward the cap 12. Thus, the cap 12 does not come off the pack body 14 when the tip of the lid 20 is connected to the cap 12. When the lid 20 is pulled out from the pack body 14 by a certain amount, the locking holes 28, 28
9 and 29 are engaged. Thus, the lid 20 is locked when pulled out by a certain amount.

As shown in FIG. 1, the sheet film unit 16 includes a 4 × 5 inch size sheet film 32,
It comprises a thin-film sheath 34 made of metal or the like having three sides bent so as to support the base surface side and surround three sides of the sheet film 32. Sheet film 3
If the flatness of 2 is maintained and the strength is sufficient, the sheath 34 can be made of plastic.

As shown in FIG. 2, for example, seven sheet film units 16 are stacked and housed in the pack body 14, and these sheet film units 16 are pressure plate springs 36 each having one end fixed to the inner wall on the back surface of the pack body 14. 2 to the front side (upward in FIG. 2). Thus, the sheet film unit 16 is pressed against the back surface of the lid 20. The inside of the pack main body 14 is
A sheet film unit 16 is housed in the left room, and a disk 40 for displaying a counter is provided in the right room. Numbers indicating the number of shots, for example, “1”, “2”,..., “7”, and an end mark “E” are engraved on the lower surface of the disc 40, and one of these numbers is the pack body. 14 and the film pack holder 50 can be observed through a window (not shown) formed in the holder main body 52. The disc 40 is driven by a mechanism on the film pack holder 50 side each time one sheet film unit 16 is photographed. Code 44
Is a light blocking member that prevents external light from entering from a gap between the sliding contact surface of the pack body 14 on which the sliding lid 20 slides and the sliding lid 20.

As shown in FIG. 1, the film pack holder 50 includes a holder main body 52, a lid 54 attached to the upper surface of the holder main body 52 so as to be openable and closable, and a slide frame slidably mounted in the holder main body 52. 56. A photographing opening 58 smaller in size than the sheet film unit 16 is formed on the surface of the lid 54, and an outer peripheral edge of the photographing opening 58 is in contact with an upper peripheral edge of the sheet film unit 16 to position the sheet film unit 16 at a photographing position. Is formed on the receiving surface 60. Further, a light shielding member 42 according to the embodiment of the present invention is provided on the rear end side of the rear surface of the lid 54.
Is attached. This light blocking member 42 will be described later.

Further, leaf springs 64, 64,... Are attached to the inside of both side walls 62, 62 along the longitudinal direction of the lid 54, respectively. The leaf spring 64 mounts the film pack 10 in the film pack holder 50 and
When the is closed, the pack body 14 is pressed downward in the figure, and also acts to press down the sheet film unit 16 discharged from the pack body 14 from above.

As shown in FIG. 2, a ridge 66 is formed near the hinge of the lid 54, and a pair of projections 68 are formed on the ridge 66. When the lid 54 is closed, the ridge 66 engages with the groove 70 of the cap 12 and
2 can be held in the film pack holder 50, and the protrusions 68 are provided on the protrusions 72, 7 of the claw member 24.
2, the pawl 26 is retracted from the locking holes 28, 28 of the lid 20, and the engagement of the lid 20 with the cap 12 can be released.

A box 74 provided on the rear end side of the slide frame 56 shown in FIG. 1 controls the sliding movement of the slide frame 56 with the holder main body 52,
A mechanism for driving 0 is built in. As shown in FIG. 2, the film pack holder 50 has a large-format camera 76 in which the front surface of the lid 54 in which the photographing opening 58 is formed is indicated by a two-dot chain line.
Is light-tightly mounted on the exposure frame 78 through positioning ridges 80 and 82.

A pair of claws 90 extending downward are provided on the rear end side of the lid 54 shown in FIG. The claw 90 is attached to the lid 5
When the shutter 4 is closed, the cover 54 is locked to the holder main body 52 by engaging with a not-shown claw provided on the holder main body 52 side. Also,
The claw 90 pushes a knob 94 provided at the rear end of the lid 54 shown in FIG.
The engagement with the pawl (not shown) on the side is released. This allows
The lid 54 can be opened.

A lock piece 84 is provided on the rear end surface of the slide frame 56 so as to be slidable in the vertical direction. The lock piece 84 is held at an upper position and a lower position by a click mechanism (not shown). When the lock piece 84 is located at the upper position, it engages with a groove 86 formed on the back surface of the lid 20. Thereby, the lid 20
Inadvertent withdrawal operation is prevented, and the lid 20 does not open even if the film pack 10 is carried while being attached to the film pack holder 50, so that it is safe. Reference numeral 88 shown in FIG. 1 is an arc-shaped projection that can be seen from the photographer side when the film pack holder 50 is mounted on a large format camera,
For example, a red mark is displayed when the preparation for shooting is completed.

By the way, the light shielding member 42 described above is
4 is attached along the width direction of the lid 54 to the rear end of the back surface of the lid 4 when the lid 54 shown in FIG.
It presses and abuts on 0A to block external light incident from the gap between the lid 54 and the lid 20. When the lid 54 is closed, the pull lid 20 is sandwiched between the light shielding member 42 on the lid 54 side and the light shielding member 44 on the pack body 14 side. Furthermore,
The light blocking member 45 shown in FIG. 2 is also attached to the bottom surface of the holder main body 52. The light shielding member 45 is attached along the width direction of the holder main body 52, and shields external light that enters from a gap between the holder main body 52 and the slide frame 56.

As shown in FIGS. 3 and 4, the light shielding member 42 is a leaf spring 1 for pressing the surface 20A of the lid 20 in the width direction.
00 is used as a core material, and a light shielding cloth 102 is attached to the leaf spring 100. The light-shielding cloth 102 is a black nonwoven fabric formed by combining short fibers into a felt shape. The leaf spring 100 is formed by integrally forming a substrate 104 and a spring piece 106. The base 104 is a rectangular flat plate that is long in the width direction of the lid 54, and is formed by screws 108, 108.
Fixed to 4A. The spring piece 106 presses the pull lid 20 by its elastic force, and is formed in a curved shape so as to increase the contact area with the pull lid 20. The tip portion 106A of the spring piece 106 is bent to the opposite side to the side of the lid 20 to prevent the lid 20 from catching on the lid 20 during the push-pull operation indicated by the arrow in FIG. I have. Further, as shown in FIG. 5, the spring pieces 106 are formed in a comb shape along the longitudinal direction of the substrate 104. Accordingly, even when the front surface 20A of the lid 20 shown in FIG. 3 is inclined with respect to the rear surface 54A of the lid 54, the spring pieces 106, 106,. The light blocking member 44 on the pack body 14 and the light blocking member 45 on the holder body 52 are
2, the description is omitted.

Next, the operation of the film pack holder 50 configured as described above will be described. First, the cover 54 of the film pack holder 50 is opened, and the film pack 10 is opened.
Is mounted in the holder main body 52. Next, when the lid 54 is closed, as shown in FIG. 2, the projection 66 engages with the groove 70 of the cap 12, and the cap 12 is
And between the projections 68 by the projections 68.
2, the claw member 24 is moved downward, and the claw 26 of the claw member 24 is disengaged from the locking hole 28 of the lid 20. Thereby, the lock of the lid 20 is released.

Next, the film pack holder 50 is inserted in FIG.
Is mounted on the exposure frame 78 of the large format camera 76 as shown in FIG. When the pull lid 20 is pulled out and completely moved to the position shown in FIG. 6, the locking holes 28, 28 of the pull lid 20 engage with the claws 29, 29 on the slide frame 56 side, and The opening is regulated, and the opening 14A of the pack body 14 is completely opened. Then, the first sheet film unit 16 </ b> A is pushed up by the pressure plate spring 36. The sheet film unit 16A is provided with the opening 14A.
And is pressed against the receiving surface 60 of the film pack holder 50 to be held at the photographing position.

When the lid 20 is returned to the original position, the lid 20 enters between the first sheet film unit 16A and the second sheet film unit 16B,
The flatness of the sheet film unit 16A at the photographing position is maintained. At this time, the lid 20 is locked to the pack body 14 and the engagement between the holder body 52 and the slide frame 56 is released by the latch mechanism built in the box portion 74. In addition, a mark indicating the completion of shooting preparation is displayed on the arc-shaped projection 88 seen from the photographer side. When the shutter of the large format camera 76 is released in this state, the first sheet film unit 16A is exposed.

After the first photographing operation is completed in this way, when the user grips the handle 18 and pulls the lid 20, the slide frame 56 and the film pack 10 are left with the cap 12 left as shown in FIG. It is pulled out of the film pack holder 50 integrally. At this time, since the photographed first sheet film unit 16A is locked at the same position by the edge portion of the receiving surface 60, the pack body passes through the gap between the upper portion of the partition plate 13 and the receiving surface 60. Get out of 14. The sheet film unit 16A completely removed from the pack body 14 is pushed into the bottom of the holder body 52 by the urging force of the leaf spring 64, the left end is held by the bent plate 110, and the right end is the pack body 1
4 is held by the rear inner wall 14A.

When the film pack 10 is inserted into the holder main body 52 together with the slide frame 56, the sheet film unit 16A passes through the collection port 15, which is a gap between the lower end of the partition 13 and the rear inner wall 14A. 14 and rides on the pressure plate spring 36 to be inserted into the lowermost layer of the unexposed sheet film unit 16. When the film pack 10 is completely inserted into the holder main body 52 in this manner, the second sheet film unit 1
6A is located directly below the lid 20. Thus, the preparation for photographing the second sheet film unit 16B is completed.

During the push-pull operation of the pull lid 20, the light shielding member 42 of the present embodiment forms the spring piece 106 of the leaf spring 100 in a comb shape as shown in FIG. Even when the surface 20A of the lid 20 is tilted and pushed and pulled, each of the spring pieces 106, 106,... Follows the inclination and abuts on the entire surface of the surface 20A of the lid 20 in the width direction. Thus, the light shielding member 42 of the present embodiment can reliably shield external light even when the lid 20 is inclined with respect to the lid 54.

Further, in the light shielding member 42 of this embodiment, since the spring piece 106 is formed in a curved shape, the contact area S of the spring piece 106 with the lid 20 is smaller than that of the conventional light shielding member as shown in FIG. It becomes wider in comparison. As a result, the frictional force per unit area applied to the light-shielding cloth 102 by the frictional force generated at the time of the push-pull operation of the lid 20 becomes smaller.
02 can be reduced. Therefore, the light shielding member 42 of the present embodiment can improve the light shielding property as compared with the conventional light shielding member.

FIG. 8 is a perspective view showing a second embodiment of the light shielding member according to the present invention. The light blocking member 112 shown in FIG.
The spring piece 116 of the leaf spring 114 is entirely curved,
Like the light shielding member 42 of the first embodiment shown in FIGS. 3 and 4, the contact area with the lid 20 is made large. Further, the distal end portion 116A of the spring piece 116 extends upward so as not to be caught on the surface 20A of the pull lid 20 when the pull lid 20 is pushed and pulled. Further, the spring piece 116
As shown in FIG. 9, is formed in a comb shape along the longitudinal direction of the substrate 118, and the spring piece 1 of the first embodiment shown in FIG.
In this case, the same effect as in the case of 06 is obtained. Reference numeral 120 denotes a light shielding cloth (nonwoven fabric), and reference numeral 122 denotes a leaf spring 114.
Are through holes for fixing to the lid 54 with two screws (not shown).

Therefore, the light shielding member 112 of the second embodiment is also
Like the light shielding member 42 shown in FIG. 4, the light shielding property can be improved as compared with the conventional light shielding member. In this embodiment, the light shielding member applied to the film pack holder has been described. However, the present invention is not limited to this, and may be applied to other optical devices such as a camera requiring a light-tight state.

[0029]

As described above, according to the light shielding member of the present invention, the tip of the leaf spring member as the core material is divided into a comb shape and formed in a curved shape, so that the light shielding property is improved. be able to.

[Brief description of the drawings]

FIG. 1 is an external view of a film pack holder and a film pack to which a light shielding member according to the present invention is applied.

FIG. 2 is a cross-sectional view showing a state where a film pack holder is mounted on a camera.

FIG. 3 is an enlarged side sectional view showing a light blocking state of the pull lid when the lid is closed.

FIG. 4 is an enlarged perspective view showing a first embodiment of a light shielding member.

5 is a perspective view of a leaf spring of the light shielding member shown in FIG.

FIG. 6 is a cross-sectional view of the film pack holder and the film pack in a state where the lid is pulled out.

FIG. 7 is a sectional view of the film pack holder and the film pack in a state where the film pack is pulled out together with the slide frame.

FIG. 8 is an enlarged perspective view showing a second embodiment of the light shielding member.

9 is a perspective view of a leaf spring of the light shielding member shown in FIG.

FIG. 10 is an enlarged perspective view showing an embodiment of a conventional light shielding member.

[Explanation of symbols]

10 ... Film pack 14 ... Pack body 16 ... Sheet film unit 20 ... Lid lid 42, 112: light shielding member 50 ... Film pack holder 52: Holder body 54 ... Lid 56 ... Slide frame 100, 114 ... leaf spring 102,120 ... Shading cloth 104, 118: substrate 106, 116 ... Spring piece

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G03C 3/00 G03B 17/00, 17/02

Claims (2)

(57) [Claims] 1. A light-shielding member having a leaf spring member as a core material and a light-shielding cloth adhered to a surface of the leaf spring member, wherein the leaf spring member has a comb-shaped tip and is curved. A light-shielding member characterized by being made. 2. A holder main body having an opening for photographing,
A light-shielding member attached to a film pack holder having a slide frame that is slidably disposed on the holder body and has a lid that keeps a sheet film unit housed therein in a light-tight state. The light-shielding member is formed by attaching a light-shielding cloth to a surface of the leaf-spring member with a leaf spring member having a tip divided and formed in a comb shape and having a curved shape as a core material, wherein the light-shielding member is formed of the holder body. A light-shielding member attached to at least one of a sliding portion between the slide body and the sliding lid and a sliding portion between the holder body and the slide frame.