Information
-
Patent Grant
-
6597865
-
Patent Number
6,597,865
-
Date Filed
Friday, May 25, 200123 years ago
-
Date Issued
Tuesday, July 22, 200320 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 396 25
- 396 27
- 396 29
- 396 543
- 396 6
- 277 626
- 277 644
- 277 647
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International Classifications
-
Abstract
By pushing down a shutter release operation member (9), that is mounted on a front of a waterproof case of a waterproof type lens-fitted photo film unit, a release lever (70) is caused to rotate through a rotary shaft (71) that is put through a front wall of the waterproof case. Thereby, the release lever directly pushes an arresting member (59) through an opening (19c) provided on a front side of a unit body (3), releasing a shutter drive member (51) as having been arrested in a cocked position by the arresting member (59), and thus causing a shutter blade (45) to make an open-close movement. The waterproof case consists of a pair of case members that are put on the unit body from its front and rear sides, and are joined to each other by engagement. An elastic waterproof ring is force-fitted in a gap of the joint between the case members. The waterproof ring has a substantially semicircular sectional contour, and is provided with a ridge on a flat surface portion on the opposite side from a curved surface portion.
Description
FIELD OF THE ART
The present invention relates to a waterproof lens-fitted photo film unit. The present invention relates also to a waterproof ring, especially a waterproof ring for use in a waterproof case of the waterproof lens-fitted photo film unit.
BACKGROUND ARTS
The lens-fitted photo film units, which are preloaded with film and provided with simple photographic mechanisms, are widely used in general, because of handiness and low prices. Also, waterproof lens-fitted photo film units (hereinafter referred to as waterproof film units) have been brought into markets. The waterproof lens-fitted photo film unit is encased in a waterproof casing having a watertight structure, and permits operating it from outside the waterproof case for photography, so it is usable in the water.
An exemplary of the waterproof lens-fitted photo film unit is disclosed in Japanese Laid-open Patent Application No. 5-188457, wherein a waterproof case covers up a unit body configured substantially equivalent to a conventional lens-fitted photo film unit. In terms of handling properties in the water, a relatively large operation member is provided on a front side of the waterproof case, such that rotating the operation member causes a releasing member, that is provided inside the waterproof case, to press a shutter button of the unit body. Since the operation member is provided on the front side of the waterproof case, the positions the photographer's fingers holding the waterproof lens-fitted photo film unit are so limited that the fingers are prevented from entering the photographic field and being photographed. Besides, shutter-releasing is done without fail just by sliding the finger on the front surface of the waterproof case.
The operation member is coupled to the releasing member through a rotary shaft that is put through a front wall of the waterproof case. The releasing member is bent around to reach a top side of the unit body, so the tip of the releasing member is located on the shutter button that is provided on the top side of the unit body. When the operation member is pushed down and rotates, the releasing member rotates, and the tip presses the shutter button to take a photograph.
To provide a space for allowing the tip of the releasing member to move is provided on the top side of the above conventional waterproof lens-fitted photo film unit, a corresponding part of a top wall of the waterproof case is protruded upward. The protrusion of the top side of the waterproof case worsens the appearance.
As an example, the waterproof case consists of a case main body for containing the lens-fitted photo film unit, and a lid for closing an opening formed through the case main body. A gasket ring is fitted in a gland formed around a rim of the opening of the case main body,. After the unit body is inserted in the case main body, the lid is put over and fixed to the opening of the case main body. Then the waterproof ring is nipped in a gap between the rim of the opening and the lid, so the opening is closed in a watertight fashion.
The waterproof ring is usually a rubber ring with a round sectional contour. However, the waterproof ring having a round section is apt twist when it is large enough for the opening that permits putting in and taking off the lens-fitted photo film unit or a camera through it, and thus disadvantageous in assembling. Moreover, since the waterproof rings have conventionally been formed individually by a metal mold, the conventional waterproof rings are pretty expensive. As a waterproof ring that overcomes these disadvantages, one having a substantially semicircular sectional contour is getting widely used these days. As having a flat surface, the waterproof ring with the approximately semicircular section (hereinafter referred to as the semi-cylindrical type waterproof ring) is inapt to twist and can be formed by cutting off from a semi-product of a cylindrical tubular shape, that saves the manufacture cost.
On the contrary, if a contact plane with which the flat surface of the semi-cylindrical type waterproof ring is brought into contact with is flat, pressures are distributed, so it is impossible to obtain a sufficient water shielding effect. For this reason, the contact plane has to be previously formed with a ridge. However, such a ridge must protrude substantially perpendicularly to a direction of pulling the metal mold off the case main body or another member in which the waterproof ring is fitted. Therefore, providing a ridge on the contact plane results in complicating the metal mold and thus rising the cost. Furthermore, even a little unevenness of the ridge on the contact plane will provide gaps between the ridge and the flat surface of the semi-cylindrical type waterproof ring, and lower the water shielding effect.
The present invention is made in view of the above described facts, and has an object to provide a waterproof lens-fitted photo film unit that is handy to operate and has a compact and smart shape.
The present invention further has an object to provide a waterproof ring that is hard to twist even with an increased ring diameter, and is manufactured at a low cost, as well as provides a sufficient water shielding effect even where the contacting portion is flat.
DISCLOSURE OF THE INVENTION
A waterproof lens-fitted photo film unit of the present invention is comprised of a unit body containing a photo film and photographic mechanisms, and a waterproof case that covers the unit body in a watertight fashion and is provided with a shutter release mechanism. The photographic mechanisms include a shutter blade, a shutter driving member for causing the shutter blade to make an open-close movement, and an arresting member for arresting the shutter driving member at a cocked position. The unit body is formed with an opening for exposing the arresting member at least partly. The shutter release mechanism comprises an operation member that is provided on the waterproof case, and a releasing member that acts on the arresting member through the opening in cooperation with the operation member being operated, to release the arrestment of the shutter driving member by the arresting member, thereby causing the shutter blade to open and close.
According to the present invention, the releasing member provided inside the waterproof case acts directly on the arresting member through the opening of the unit body, to activate the shutter driving member. Therefore, the structure is simplified as compared to the case where the shutter button is pressed by the releasing member, making it possible to provide a compact waterproof lens-fitted photo film unit at a low cost.
Providing the operation member on the front side of the waterproof case and making the releasing member act on the arresting member through the opening that is formed through the front side of the unit body enable locating the releasing member in a lower position than the top side of the unit body, so it is possible to achieve a better appearance without any protrusion on the top side of the waterproof case.
According to a preferred embodiment of the present invention, the operation member is affixed to an end of a rotary shaft that is inserted in a hole formed through the front wall of the waterproof case, and the releasing member is affixed to the other end of the rotary shaft. The rotary shaft is formed integrally with the operation member from plastics, and the above other end consists of a pair of arms extending in parallel to an axial direction. Each arm has an engaging claw protruding radially outward from its peripheral surface. As the pair of arms are inserted from the front side into the above hole while being bent toward each other, the engaging claws are engaged with inside surface of the front wall of the waterproof case by virtue of resiliency of the arms. Thereby, the rotary shaft is stopped from slipping off. The releasing member is affixed to tips of the arms. Then, the arms can bend only in a limited amount. Thus, it is possible to assemble these members without any cumbersome works such heat caulking or riveting.
A waterproof ring of the invention is characterized by comprising a curved surface portion and at least a flat surface portion, having a substantially semicircular sectional contour, and being provided with a ridge on the flat surface portion that is on the opposite side from the curved surface portion. According to this configuration, even if the member the waterproof ring is brought into contact with is flat, contact pressure is not distributed, so a reliable water shielding effect is provided. Because it is unnecessary to provide a ridge on the member in which the semi-cylindrical type waterproof ring is to be mounted, the member becomes easier to form, so it is possible to cut the manufacturing cost while improving reliability on the water shielding effect.
Shaping the curved surface portion to have a sectional contour that forms an arc with a constant radius, and locating a center of the arc at a summit of a sectional contour of the ridge, the waterproof ring keeps a constant thickness inside a gap in which the waterproof ring is nipped, even if the waterproof ring turns around. Thus, water shielding effect is stabilized.
Shaping the ridge of the waterproof ring to have an arc-shaped sectional contour at least around the summit contributes to improving assembling adaptability in addition to the above effects, because it becomes unnecessary to fix the inserting direction of the waterproof ring.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a perspective view illustrating an appearance of a waterproof lens-fitted photo film unit according to a first embodiment of the present invention;
FIG. 2
is an exploded perspective view of a unit body of the waterproof lens-fitted photo film unit of the first embodiment;
FIG. 3
is an exploded perspective view of photographic mechanisms of the waterproof lens-fitted photo film unit of the first embodiment;
FIG. 4
is an exploded perspective view of a shutter release mechanism provided on a waterproof case of the waterproof lens-fitted photo film unit of the first embodiment;
FIG. 5
is a sectional view of the shutter release mechanism of
FIG. 4
;
FIG. 6
is an exploded perspective view of a waterproof case of the waterproof lens-fitted photo film unit of a second embodiment of the present invention;
FIG. 7
is a perspective view, partly in section, of a waterproof ring according to the present invention;
FIG. 8
is a perspective view of a semi-product for the waterproof ring;
FIG. 9
is a sectional view of a joint portion of the waterproof case using the waterproof ring;
FIG. 10
is a sectional view of a waterproof ring according to another embodiment; and
FIG. 11
is a sectional view of a waterproof ring according to still another embodiment.
PREFERRED EMBODIMENTS OF THE PRESENT INVENTION
The present invention will be described in more detail with reference to the accompanying drawings.
As shown in
FIG. 1
, a waterproof lens-fitted photo film unit
2
consists of a unit body
3
incorporated with photographic mechanisms having a taking lens
5
, a finder objective window
6
, a film counter window
7
and other elements exposed to the outside, and a parallelepiped waterproof case
4
that contains the unit body
3
in a watertight fashion.
The waterproof case
4
consists of a case main body
4
a
that is made of a transparent plastic and accepts the unit body
3
from its rear side opening, and a lid
4
b
that closes the rear side opening of the case main body
4
a
. A decoration label
3
a adhering to a center belt-like zone of the unit body
3
is displayed through the case main body
4
a
. It is possible to decorate the unit body
3
with a paper box instead of the decoration label
3
a.
A winding dial
8
is provided on a top side of the waterproof case
4
, and is rotated for film-winding by one frame. A shutter release operation member
9
and a push button type flash operation member
10
are provided on a front side of the waterproof case
4
in a watertight fashion. The shutter release operation member
9
is operated by hanging a finger on its operation end
9
a
and pushing down by the finger.
As shown in
FIG. 2
, the unit body
3
is constituted of a body basic portion
16
containing a cartridge main body
12
and a photo film
13
, an exposure unit
17
, a flash unit
18
, a front cover
19
, a rear cover
20
and other members.
The exposure unit
17
is fastened by hooks to a light-shielding barrel
21
that is provided in the center of the body basic portion
16
. The cartridge shell
12
and the photo filmstrip
13
, that is pulled out from the cartridge shell
12
and is coiled into a roll, are respectively contained in a cartridge chamber
22
and a film roll chamber
23
which are provided on the opposite sides of the light-shielding barrel
21
. The rear cover
20
is fastened by hooks to a rear side of the body basic portion
16
to cover these chambers from their rear sides, and bottom openings of these chambers are closed light-tightly with bottom lids
20
a
and
20
b
of the rear cover
20
.
The flash unit
18
is constituted of a flash light projector
18
b
, a main capacitor
18
c
, a synchronizing switch
18
d
and other elements which are mounted to a circuit board
18
a
having a flash circuit thereon. The flash unit
18
is fastened by hooks to a front side of the body basic portion
16
on the side of the film roll chamber
23
, and the front cover
19
is fastened by hooks to the front side of the body basic portion
16
to cover the flash unit
18
and the exposure unit
17
.
A winding knob
25
is disposed above the cartridge chamber
22
, and has a shaft engaged with an end of a spool
12
a
of the cartridge shell
12
. The winding dial
8
has a shaft that is put through a top wall of the waterproof case
4
, and a hole
19
a
formed through a top side of the front cover
19
, and is engaged in a hole
25
a
that is formed on a top side of the winding knob
25
. According to this configuration, rotating the winding dial
8
in a winding direction as shown by an arrow causes the spool
12
a
to rotate together with the winding knob
25
, thereby to wind the photo filmstrip
13
into the cartridge shell
12
. It is possible to provide a gear on a rear side of the waterproof case
4
to transmit rotation of the winding dial
8
to the winding knob
25
through the gear.
A flash charge start button
19
b
is formed integrally with a front wall of the front cover
19
, and is pressed by pressing the flash operation member
10
. Then an electric contact strip
18
e
is brought into contact with a pair of contacts on the circuit board
18
, to connect them electrically, so the flash circuit is turned on to charge the main capacitor
18
c.
In
FIG. 3
, the exposure unit
17
is an integral unit having elements of the photographic mechanism mounted on a base member
40
. Instead of providing the integrated exposure unit
17
, it is possible to mount the elements of the photographic mechanisms directly on the body basic portion
16
. A lens holder
43
for holding the taking lens
5
is mounted on a front side of the base member
40
, and a shutter blade
45
is pivotally mounted in between the lens holder
43
and the base member
40
.
The shutter blade
45
is urged by a coiled spring
47
to rotate in a counterclockwise direction, and closes a shutter aperture
49
that is formed through the base member
40
, in a closed position where the shutter blade
45
is in contact with an arc-shaped projection
48
. When the shutter blade
45
moves to an open position to open the shutter aperture
49
, a projection
45
a
comes to contact with the synchronizing switch
18
d
of the flash unit
18
, short-circuiting it. When the synchronizing switch
18
d
is short-circuited, the flash light projector
18
b
projects a flash of light.
On a top side of the base member
40
are mounted a shutter drive member
51
, a spring
56
, a frame counter disc
57
, a spring
58
, an arresting member
59
, a cam member
60
and so forth. On a rear side of the base member
40
is mounted a sprocket
61
through a shaft
65
of the cam member
60
. These members are held by a top plate
63
that is mounted above the base member
40
. The cam member
60
has a counter drive shaft
66
, a winding-stop cam
67
and a shutter charging cam
68
as an integral part.
The sprocket
61
is engaged in perforations
13
a
of the photo film
13
, so the sprocket
61
rotates as the photo film
13
is conveyed by rotating the winding wheel
8
, and thus the cam member
60
rotates along with the rotation of the sprocket
61
. When the photo filmstrip
13
is advanced by one frame, the cam member
60
has made a half revolution, and a groove
67
a
of the winding stop cam
67
reaches a position facing a claw portion
59
a
of the arresting member
59
. Then, the arresting member
59
rotates slightly in a clockwise direction according to the force of the spring
58
, letting the claw portion
59
a
into the groove
67
a
, and thus interrupting the film advancement. Simultaneously, a winding stop claw
59
b
is engaged in gears of the winding knob
25
, preventing it from being wound in the winding direction. That is, the winding knob
25
is set in a film winding stop condition.
When the shutter charge cam
68
makes a half revolution with a half revolution of the cam member
60
, a blade-like projection
68
a
of the shutter charge cam
68
pushes a projection
51
a
of the shutter drive member
51
, causing the shutter drive member
51
to rotate clockwise against the force of the spring
56
. As a result, an arresting projection
59
c
that is protruded downward from the arresting member
59
and an arrested projection
51
b
that is protruded upward from the shutter drive member
51
are brought into contact with each other and engaged with each other. Thus the shutter drive member
51
is arrested in a cocked position by the arresting member
59
.
As set forth in detail later, when a leg
59
d
extending downward from the arresting member
59
is pushed by a shutter release mechanism that is provided on the waterproof case
4
, and thus the arresting member
59
rotates counterclockwise, the arresting projection
59
c
is disengaged from the arrested projection
51
b
. Then the shutter drive member
51
rotates counterclockwise according to the force of the spring
56
, so a kick blade
51
a
of the shutter drive member
51
kicks an end
445
b
of the shutter blade
45
. Thereby, the shutter blade
45
rotates clockwise to open the shutter aperture
49
, exposing the photo filmstrip
13
. The shutter blade
45
returns to the position closing the shutter aperture
49
, according to the force of the coiled spring
47
.
As shown in
FIGS. 4 and 5
, the shutter release mechanism provided on the waterproof case
4
is constituted of a release lever
70
engaged with a rotary shaft
71
of the shutter release operation member
9
, an O-ring
72
, a spring
73
and other members, in addition to the shutter release operation member
9
. A hole
75
is formed through a front wall of the waterproof case
4
, and a hub
76
is formed around the hole
75
to protrude forward. A rubber O-ring
72
is fitted in the hub
76
. The rotary shaft
71
is inserted in the hub
76
and is able to rotate therein. The rotary shaft
71
is protruded into the waterproof case
4
through the hole
75
. The rotary shaft
71
closes the front of the hub
76
and stops the O-ring
72
from removing. The O-ring
72
prevents water and dust from entering the waterproof case
4
through the hole
75
.
The rotary shaft
71
consists of a pair of arms
77
and
78
extending in parallel to the axial direction of the rotary shaft
71
, and is formed integrally with the shutter release operation member
9
from plastics. A claw
77
a
or
78
a
is integrally formed on an outer peripheral surface of each arm
77
or
78
. The claws
77
a
and
78
a
are engaged with the rim of the hole
75
inside the front wall of the waterproof case
4
, to fasten the rotary shaft
71
to the waterproof case
4
. Tips
77
b
and
78
b
of the arms
77
and
78
are force-fitted in key holes
70
b
and
70
c
of the release lever
70
, fastening the release lever
70
to the tip of the rotary shaft
71
.
A spring
73
is fitted on the hub
76
, and is covered with the shutter release operation member
9
. A protrusion
80
is provided on the front side of the waterproof case
4
in the vicinity of the hub
76
, and is located inside the operation end
9
a
of the shutter release operation member
9
. One end
73
a
of the spring
73
is hooked on the protrusion
80
, and the other end
73
b
is hooked on a pin
9
b
that is provided inside the shutter release operation member
9
. The spring
73
urges the shutter release operation member
9
in the clockwise direction, so an inner surface of a bottom side wall of the operation end
9
a
is pressed against the protrusion
80
. To take a photograph, the shutter release operation member
9
is pushed down till an inner surface of a top side wall of the operation end
9
a
comes to contact with the protrusion
80
. As the finger removes, the shutter release operation member
9
returns to the initial position.
An opening
19
c
is formed through the front side of the front cover
19
, for exposing the leg
59
d
of the arresting member
59
and the arrested projection
51
b
of the shutter drive member
51
. The release lever
70
has an eccentric end portion
70
c
that is extended in the axial direction such that the end portion
70
c
is protruded into the opening
19
c
and is located closely on the left side of the leg
59
d
when the unit body
3
is contained in the case main body
4
a
. Since the end portion
70
c
of the release lever
70
is located inside the unity body
3
through the opening
19
c
, the thickness of the waterproof case
4
can be reduced.
When the operation end
9
a
of the shutter release operation member
9
is pushed down after the shutter drive member
51
is cocked by winding up the film by one frame, the release lever
70
rotates in the counterclockwise direction together with the rotary shaft
71
, so the end portion
70
c
of the release lever
70
directly pushes the leg
59
d
to disengage the engaging projection
59
c
of the arresting member
59
from the engaged projection
51
b
of the shutter drive member
51
, thereby activating the shutter drive member
51
to make an exposure.
In this way, the release lever
70
that is the release member for releasing the shutter mechanism directly pushes the arresting member
59
through the opening
19
c
of the front of the unit body
3
, so it comes to be possible to locate the release member at a position lower than the top surface of the unit body
3
. Accordingly, the waterproof case
4
gets a neat appearance with no protuberance on the top side. Besides, as the end portion
70
c
of the release lever
70
is inserted in the unit body
3
through the opening
19
c
, the thickness of the waterproof case
4
can be reduced.
The shutter release mechanism of the waterproof case
4
is assembled in the following sequence. First, the O-ring
72
is fitted in the hub
76
, and the spring
73
is fitted on the hub
76
. Thereafter, the rotary shaft
71
of the shutter release operation member
9
is plugged into the hub
76
from its front side, while hanging the ends
73
a
and
73
b
of the spring
73
on the protrusion
80
and the pin
9
b
. At that time, the arms
77
and
78
of the rotary shaft
71
are thrust into the O-ring
72
and the hole
75
while being bent to close their tips
77
b
and
78
b
to each other. When the claws
77
a
and
78
a
of the arms
77
and
78
are put through the hole
75
, the arms
77
and
78
resiliently return to their initial position, so the claws
77
a
and
78
a
are hooked on the inside of the front wall of the waterproof case
4
. Thus, the rotary shaft
71
is easily stopped from removing. As the rotary shaft
71
plugs the hub
76
watertight, water will not enter the waterproof case
4
through the hole
75
. Since the shutter release operation member
9
is formed integrally with the rotary shaft
71
, a process for attaching the shutter release operation member
9
is not needed. Next, the tips
77
b
and
78
b
of the arms
77
and
78
are force-fitted in the key holes
70
a
and
70
b
of the release lever
70
to affix the release lever
70
. Thereby the arms
77
and
78
are stopped from bending, ensuring the anti-removal of the rotary shaft
71
and also preventing the arms
77
and
78
from twisting. In this way, the shutter release mechanism can be assembled without the need for cumbersome works, like heat caulking or riveting. So the number of parts as well as the number of assembling processes may be reduced.
In
FIG. 6
showing a waterproof lens-fitted photo film unit according to the second embodiment of the present invention, a waterproof case
91
consists of a front case member
92
that is put on a unit body
3
from the front side to cover front, top, bottom and opposite lateral sides of the unit body
3
, a rear case member
93
that is mounted to the front case member
92
from the rear side of the unit body
3
, and a waterproof cover
94
that is put on the outside of the front case member
92
.
The front case member
92
is formed from a transparent plastic, and has an exposing section
95
on its front side for exposing a taking lens
5
and a finder objective window
6
of the unit body
3
to outside. A groove
96
is formed around the circumference of the exposing section
95
. The rear side of the front case member
92
is made to be an open end for accepting the unit body
3
. Around the circumference of the open end
97
, a grant
98
for fitting a waterproof ring
100
therein and a ridge
99
are formed integrally with the front case member
92
(see FIG.
7
).
As shown in
FIG. 8
, the waterproof ring
100
is a semi-cylindrical type waterproof ring
100
whose section has a substantially semi-circular shape consisting of an outer surface section
101
having an arc-shaped profile, and flat inner, top and bottom surface sections
102
,
103
and
104
. A ridge
105
having an arc-shaped profile is provided on a middle position of the inner surface section
102
. As the material for forming the semi-cylindrical type waterproof ring
100
, an ordinary rubber is used, but any other elastic material is usable insofar as it has proper waterproof properties. Since the semi-cylindrical type waterproof ring
100
has the flat inner, top and bottom surface sections
102
,
103
and
104
, it is inapt to twist even where the ring has a large diameter. So the semi-cylindrical type waterproof ring
100
is superior in assembling facility. Because the ridge
105
with the arc-shaped profile is pressed against a bottom surface of the grant
98
that is formed around the outer periphery of the open end
97
, contacting pressure of the waterproof ring
100
onto the bottom surface of the grant
98
is not distributed even through the bottom surface is flat. Accordingly, the waterproof ring
100
is kept in tight contact with the front case member
92
. Since it is not necessary providing a ridge on the bottom surface of the grant
98
for the purpose of preventing pressure distribution, the front case member
92
is easy to form.
Moreover, as shown in
FIG. 9
, the semi-cylindrical type waterproof ring
100
may be produced by cutting the individual waterproof ring
100
off a semi-formed product
107
of a cylindrical tubular shape that consists of a number of semi-produced waterproof rings
100
a
piled up in the direction of thickness. Therefore, the semi-cylindrical type waterproof ring
100
is easy to mass-produce and thus manufactured at a low cost.
As shown in
FIG. 6
, a hole
75
is formed through a front wall of the front case member
92
, and a hub
76
is formed to protrude from around the hole
75
. An O-ring
72
is fitted in the hub
76
. A rotary shaft
71
, the rotational center of a shutter release operation member
9
, is inserted in the hub
76
so as to be able to rotate therein, and a tip of the rotary shaft
71
is put through the hole
75
into the waterproof case
91
. A release lever
70
is attached to the tip of the rotary shaft
71
. When a unit body
3
is accommodated in the front case member
92
, the release lever
70
is put into an opening
19
c
that is formed through the front of a front cover
19
, and is engaged with the shutter mechanism of the exposure unit. So the shutter mechanism is actuated by operating the shutter release operation member
9
to swing. A coiled spring
73
is mounted on the periphery of the hub
76
, to urge the shutter release operation member
9
in a clockwise direction in the drawing, so that the shutter release operation member
9
is always returned to its initial position.
On the top side of the front case member
92
is provided a upward protruding hub
109
, to which a winding dial
8
is rotatably mounted. A shaft
8
b
of the winding dial
8
is inserted through a hole
108
of the hub
109
into the waterproof case
91
, and is engaged in an engaging hole
25
a
of a winding knob
25
through an opening formed through the front cover
19
of the unit body
3
.
The waterproof cover
94
is formed from a semi-transparent elastomer, a high-polymer with elasticity, and has a corresponding shape to the front case member
92
, but is slightly larger than the front case member
92
so that the waterproof cover
94
may be tightly fitted on the outside of the front case member
92
. The waterproof cover
94
has an opening
116
formed through its front side, for uncovering the exposing section
95
that is formed on the front side of the front case member
92
. A ridge
117
is formed through around the rim of the opening
116
, and is protruded toward the front case member
92
. The ridge
117
is made slightly larger in width than the groove
96
of the front case member
92
, and is crushed into the groove
96
, so that the ridge
117
is kept in tight contact with the inner walls of the groove
96
, making joint between the waterproof cover
94
and the front case member
92
watertight.
The waterproof cover
94
also has openings
118
and
119
on its front and top sides, for exposing the hubs
76
and
109
of the front case member
92
. Because the openings
118
and
119
are smaller than the opening
116
, and rarely remove off the surface of the front case member
92
, any water-shielding device, such as the ridge
117
around the opening
116
and the groove
96
, is not provided around the openings
118
and
119
.
The rear side of the waterproof cover
94
is formed as an open end
114
for permitting putting the waterproof cover
94
on the front case member
92
. A brim
115
is integrally formed around the entire circumference of the open end
114
. The brim
115
is put on the outside of the ridge
99
of the front case member
92
, as shown in FIG.
7
.
The rear case member
93
is formed from a transparent plastic, so a not-shown finder window of the unit body
3
may be viewed from outside the rear case member
93
. A groove
124
is formed on the front side of the rear case member
93
around its entire circumference, and the open end
97
of the front case member
92
is inserted in this groove
124
. The groove
124
has a width that is slightly less than a total thickness of the open end
97
and the waterproof ring
100
covering the outside of the outer periphery of the open end
97
. Accordingly, when the open end
97
is inserted into the groove
124
, the outer surface section
101
and the ridge
105
of the waterproof ring
100
are depressed, and thus brought into tight contact with the inner walls of the groove
124
and the bottom surface of the grant
98
as well, ensuring watertight joint between the front and rear case members
92
and
93
.
A pair of strips
127
are provided on the front of either horizontal side of the rear case member
93
. The strips
127
are each formed with an engaging hole
126
, and are engaged with engaging claws that are not-shown but formed on inside of side walls of the front case member
92
. Through this engagement, the rear case member
93
is securely fastened to the front case member
92
.
As shown in
FIG. 10
, the outer surface portion
101
of the semi-cylindrical type waterproof ring
100
preferably forms an arc in profile that is formed around a summit P of the ridge
105
with a radius R. According to this configuration, if the waterproof ring
100
turns round as it is mounted, the thickness of the waterproof ring
100
would not change in between the case members
92
and
93
, so the contact pressure of the waterproof ring
100
is kept constant, providing stable water-shielding effects. Although the ridge
105
is entirely arc-shaped in profile in the illustrated embodiment, the same effect is provided by a ridge which is arc-shaped in profile at least around its peak.
As shown in
FIG. 11
, a semi-cylindrical type waterproof ring
181
may have an inner surface portion
182
of a roof-shape that consists of a pair of gently sloped surfaces
182
a
and
182
b
. Because being easy to remove from the metal mold, the waterproof ring of this shape is preferable in view of forming. Shaping an outer surface portion
183
to be an arc in profile that is formed about a peak Q of the inner surface portion
182
provides the same effects as the waterproof ring
100
of FIG.
10
.
In the above described embodiment, the ridge is provided on the flat inner surface of the semi-cylindrical waterproof ring. But it is possible to provide a flat surface portion on the outside of the waterproof ring, and provide a ridge on this flat surface portion. The ridge on the flat surface portion may have a triangular, trapezoidal or rectangular profile.
The structure of the shutter-release mechanism mounted to the waterproof case is not to be limited to the above described structure, insofar as it acts directly on the arresting member through an opening of the film unit. For example, it is possible to provide a shutter release operation member and a release lever which may rotate about parallel axes to each other, and couple these axes to each other through gears. It is alternatively possible to provide a release member on a tip of a push-type operation member. The location of the operation member is not limited to the front of the waterproof case, but the operation member may be located on the top, rear or side portion of the waterproof case, in correspondence with the location of the opening that exposes the arresting member at least partly.
Although the front case member constitutes a case main body, and a rear case member constitutes a lid for closing the open end of the case main body in the waterproof case used in the illustrated embodiments, it is not necessary to limit the waterproof case to this configuration. For example, the waterproof case may be constituted of a front case half and a rear case half. The waterproof case may also be constituted of those parts which cover the unit main body from the top and bottom.
Thus, the present invention is not to be limited to the above embodiments, but various modification will be possible without departing from the scope of claims.
INDUSTRIAL APPLICATION FIELD
The present invention is preferably applicable not only to the waterproof lens-fitted photo film units, but also to the compact cameras. The semi-cylindrical type waterproof ring of the present invention is preferable not only for use in waterproof cases of the waterproof lens-fitted photo film units, but also for use as a waterproof ring in a fitting joint between parts of any kind, such as a fitting joint in a housing of a waterproof camera.
Claims
- 1. A waterproof lens-fitted photo film unit comprising:a unit body containing a photo film and photographic mechanisms, said photographic mechanisms comprising: a shutter blade, a rotatable shutter driving member for causing said shutter blade to make an open-close movement, and a rotatable arresting member positioned to make contact with and arrest said shutter driving member at a cocked position; a waterproof case that covers said unit body in a watertight fashion; an opening formed through said unit body; an operation member mounted on and put through said waterproof case such that said operation member may be operated from outside of said waterproof case; and a releasing member mounted to said operation member inside said waterproof case, wherein a tip of said releasing member is inserted into said unit body through said opening, and is in direct contact with said arresting member inside said unit body when said operation member is operated, thereby to release said shutter driving member from arrestment of said arresting member, and cause said shutter blade to make said open-close movement.
- 2. A waterproof lens-fitted photo film unit as recited in claim 1, wherein said opening is formed through a front side of said unit body, and said operation member is provided on the front side of said waterproof case.
- 3. A waterproof lens-fitted photo film unit as recited in claim 2, wherein said operation member is affixed to an end of a rotary shaft that is inserted in a hole formed through a front wall of said waterproof case, and said releasing member is affixed to the other end of said rotary shaft.
- 4. A waterproof lens-fitted photo film unit as recited in claim 3, wherein said rotary shaft is formed integrally with said operation member from plastics, and has a portion on said other end that is constituted of a pair of arms extending in parallel to an axial direction, each of said arms having an engaging claw protruding radially outward from a peripheral surface of said arm, wherein said arms are inserted from the front side into said hole formed through said front wall, while being bent toward each other, thereby to bring said engaging claws into engagement with inside surface of said front wall of said waterproof case by virtue of resiliency of said arms, and fasten said rotary shaft to said front wall in a rotatable fashion, and said releasing member is thereafter affixed to tips of said arms.
- 5. A waterproof lens-fitted photo film unit comprising:a unit body containing a photo film and photographic mechanisms; a waterproof case that covers said unit body in a watertight fashion, said waterproof case consisting of a pair of case members which are joined to each other after being put over said unit body; and a waterproof ring formed from an elastic material disposed between said case members, the ring having first and second contact faces in contact with the respective case members, the first and second contact faces being arranged directly opposite one another, the first contact face having an arcuate shape in cross-section, the second contact face having a center arcuate section with an immediately adjacent flat section on either side in cross-section section.
- 6. The waterproof lens-fitted photo film unit of claim 5, wherein the immediately adjacent flat sections of the second contact face are coplanar.
- 7. The waterproof lens-fitted photo film unit of claim 5, wherein the arcuate cross-sectional shape of the first contact face has a radial center point that lies on a surface of the center arcuate section of the second contact face.
- 8. A waterproof lens-fitted photo film unit as recited in claim 5, further comprising a waterproof cover that covers said case members at least partly.
- 9. A waterproof lens-fitted photo film unit comprising:a unit body containing a photo film and photographic mechanisms; a waterproof case that covers said unit body in a watertight fashion, said waterproof case consisting of a pair of case members which are joined to each other after being put over said unit body; and a waterproof ring formed from an elastic material disposed between said case members, the ring having first and second contact faces in contact with the respective case members, the first and second contact faces being arranged directly opposite one another, the first contact face having an arcuate shape in cross-section, the arcuate cross-sectional shape of the first contact face having a radial center point that lies on a surface of the second contact face.
- 10. The waterproof lens-fitted photo film unit of claim 9, wherein the second contact face has an arcuate shape in cross-section.
- 11. The waterproof lens-fitted photo film unit of claim 10, wherein the arcuate second contact face has an immediately adjacent flat section on either side.
- 12. The waterproof lens-fitted photo film unit of claim 9, wherein a second contact face comprises in cross-section two flat sections arranged at an oblique angle with respect to one another, the radial center point of the first contact face corresponding to a vertex of the two flat sections.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-333938 |
Nov 1998 |
JP |
|
10-369537 |
Dec 1998 |
JP |
|
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP99/06459 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO00/31585 |
6/2/2000 |
WO |
A |
US Referenced Citations (6)
Foreign Referenced Citations (5)
Number |
Date |
Country |
4-116837 |
Oct 1992 |
JP |
5-142703 |
Jun 1993 |
JP |
5-188457 |
Jul 1993 |
JP |
6-82897 |
Mar 1994 |
JP |
8-24749 |
Oct 1996 |
JP |