JPH0414331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film cassette used, for example, in an endoscope camera.

A film cassette for an endoscope is comprised of a film supply section and a film winding section with a bridge in between. A spool for winding the film is rotatably housed in the film winding portion of the film cassette, and an engaging claw integral with the spool is exposed on the upper surface of the film cassette. On the other hand, an endoscope camera has an opening/closing lid pivotally attached to the back side of the camera body, and the film cassette is loaded into a cassette storage chamber within the camera body by opening the opening/closing lid.

In this case, since the film cassette is loaded into the cassette storage chamber by sliding it from the back of the camera body in the direction of the optical axis, it is necessary to avoid interference between the film winding shaft on the camera side and the film cassette during loading. The film winding shaft is movable up and down, and when a film cassette is loaded, the film winding shaft is retracted upward, and after loading, it is lowered and engaged with an engaging claw of the film cassette.

However, making the film winding shaft movable up and down increases the height of the camera body by the stroke thereof, and it also becomes mechanically complex. Furthermore, when taking out the film cassette from the camera after photographing, it is necessary to remove the film cassette while retracting the film winding shaft upward, which makes it troublesome to attach and remove the film cassette.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to connect a spool constituting a film winding section to a film winding member and an engaging member that engages with a film winding shaft of a camera. The engaging member passes through the film winding section up and down and is movable in the thrust direction, making it easy to attach and detach the film cassette to and from the camera. The purpose of this invention is to provide a film cassette that can be used in a variety of ways.

The present invention will be described below based on an embodiment shown in the drawings. 1 and 2 show a film cassette for an endoscope, and 1 is a cassette body. The cassette main body 1 is comprised of a film supply section 3 and a film winding section 4 with a bridge 2 in between. An unexposed film 5 of, for example, 8 mm or 16 mm is housed in the film supply section 3 in a wound state, and one end of the film is connected to a spool 20 (described later) of the film winding section 4.

3 and 4 show an endoscope camera, and 6 is the camera body. This camera body 6
A cassette storage chamber 7 into which the cassette main body 1 is loaded is provided inside. An opening/closing lid 9 for opening and closing the opening 8 of the cassette storage chamber 7 is pivotally mounted on the back side of the camera body 6.

The opening/closing lid 9 is opened and the cassette body 1 is slid from the rear of the camera body 6 in the direction of its optical axis to be loaded into the cassette storage chamber 7.

Next, the cassette main body 1 will be explained in detail based on FIG. 2, FIG. 5, and FIG. 6. 10
11 is a lower case, and 11 is an upper case. A first cylindrical section 12 forming the film supply section 3 and a second cylindrical section 13 forming the film winding section 4 are integrally molded into the lower case 10 together with the bridge 2. In addition, the upper case 11
are provided with lids 14 and 15 that close the upper openings of the first and second cylindrical portions 12 and 13. Furthermore, an opening 16 is provided at the bottom of the second cylindrical portion 13, and a jetty 17 that projects upward is provided at the opening edge of the opening 16. Further, the lid body 15 is also provided with an opening 18 that faces the opening 16 and has a larger diameter than the opening 16.
A jetty 19 projecting downward is provided on the edge of the opening 8. A spool 20 is rotatably fitted between these openings 16 and 18.
The spool 20 is composed of an engaging member 21 and a film winding member 22 that fits into the engaging member 21, and has a film storage chamber 23 formed around its outer periphery. That is, the engagement member 21 has a cylindrical shape, and consists of a large diameter part 21A and a small diameter part 21B in the axial direction.
B vertically passes through the film winding member 22 and is movable in the thrust direction, and the large diameter portion 21A of the engaging member 21 and the film winding member 22 are arranged with a gap therebetween.

The large-diameter portion 21A of the engaging member 21 is disposed at the bottom of the second cylindrical portion 13, and an annular groove 24 that fits into the jetty 17 is carved in the lower surface of the large diameter portion 21A. Therefore, the bottom portion 21 of the engaging member 21
a is exposed from the opening 16. Further, the small diameter portion 21B of the engaging member 21 is formed on a rotating shaft 25, and an engaging claw portion 26 is provided at the upper end of the rotating shaft 25. The rotating shaft 25 is fitted into the fitting hole 22a of the film winding member 22. The film winding member 22 has a cylindrical shape similar to the above-mentioned engaging member, and has an annular groove 27 cut into its upper end surface to fit into the projection 19 of the lid 15. Furthermore, the engagement member 2
A compression spring 28 that fits around the rotating shaft 25 is interposed between the upper surface of the film winding member 1 and the lower surface of the film winding member 22.
6 is biased in the direction of immersion. Further, a protrusion 29 extending in the axial direction is provided on a part of the rotating shaft 25 of the engagement member 21, and an engagement groove 30 is carved in the fitting hole 22a of the film winding member 22 facing the protrusion 29. It is set up. Then, the protrusion 29 and the engagement groove 30
The engaging member 21 is engaged with the engaging member 21 and is movable in the thrust direction, but the rotating direction is transmitted, and the rotation of the engaging member 21 is transmitted to the film winding member 22. Further, if the outer diameter of the film winding member 22 is D ₁ and the outer diameter of the engaging member 21 is D ₂ , then
There is a relationship of D ₁ ≧ D ₂ , and the film winding member 22
One side edge of the film 5 wound around the outer periphery of the film 5 is also wound around the engaging member 21, and even in this state, the engaging member 21 can move in the thrust direction. However, after the film 5 is wound, the film 5 is loosened and the inner diameter of the film 5 is expanded, so that the engaging member 21 can move in the thrust direction without resistance.

Next, the camera body 6 will be described in detail based on FIG. 7. That is, 34 is a support member provided in the cassette storage chamber 7, which includes a plurality of support stands 36 protruding from the bottom 35 of the cassette storage chamber 7.
It is fixed by. Therefore, this support member 34 is spaced apart from the bottom 35 of the cassette storage chamber 7, and a pivot shaft 37 is pivotally supported on the front edge thereof. The opening/closing lid 9 is attached to this pivot shaft 37.
The lower end of the cassette storage chamber 7 is pivoted to open and close the opening 8 of the cassette storage chamber 7. Further, support walls 38, 38 are bent at both ends of the support member 34 and stand along both side surfaces of the cassette storage chamber 7, and one of the support walls 38, that is, the film of the cassette body 1 is bent. A slide plate 39 is provided on the side facing the winding section 4. This slide plate 39 is formed in an L-shape, and its vertical plate 40 is attached to the outer surface of the support wall 38, and its horizontal plate 41 is attached to the support member 38.
are facing each other at the bottom. Furthermore, the vertical plate 40 of the slide plate 39 has elongated holes 42 and 4 in the vertical direction.
2 are bored, and these long holes 42, 42 are connected to the support wall 3.
8, protruding pins 43, 43 are inserted.
Therefore, the slide plate 39 is supported by the pins 43, 43 which engage with the elongated holes 42, 42 so as to be slidable in the vertical direction, and is constantly urged upward by the urging spring 44. Also, this slide plate 39
A push-up pin 45 is provided protrudingly on the horizontal plate 41 of the
A through hole 45a is bored in the support member 34 facing this. The push-up pin 45 is attached to the bottom 2 of the engaging member 21 in the film winding section 4 of the cassette body 1 loaded onto the supporting member 34.
1a, and when the slide plate 39 rises, it comes into contact with the bottom part 21a of the slide plate 39, and the engagement member 21 is compressed by the compression spring 28.
It is now possible to push up against the restoring force of. That is, the engaging member 21 of the spool 20 can be pushed up against the claw portion 47 of the film winding shaft 46 provided at the upper part of the cassette storage chamber 7, and the engaging claw portion 26 can be engaged with the engaging member 21 of the spool 20.

Further, a notch portion 48 is provided in the vertical plate 40 of the slide plate 39, and an engaging stepped portion 49 is formed at the lower end of this notch portion 48. Further, a lock clipper 51 is pivotally supported on the support wall 38 facing the notch 48 and is rotatable about a pin 50, and is biased counterclockwise by a biasing spring 52. . The upper end of the lock lever 51 is provided with an operating part 54 that faces a pressing part 53 protruding from the back surface of the opening/closing lid 9, and the lower end is provided with an engaging part 55 that can be freely engaged with and detached from the engaging stepped part 49. is provided. This lock lever 51 is the opening/closing lid 9.
When opened, the engaging portion 55 rotates counterclockwise due to the restoring force of the biasing spring 52 and engages the engaging stepped portion 49, locking the slide plate 39 in the lowered position and closing. Sometimes the action part 54 is pressed by the pressing part 53.
is pressed and rotated clockwise to retract the engaging portion 55 from the engaging stepped portion 49 and release the lock.

Next, the camera body 6 configured as described above
The operation of attaching and detaching the cassette body 1 to and from the cassette body 1 will be explained. When the opening/closing lid 9 of the camera body 6 is open, the lock lever 51 is rotated counterclockwise by the restoring force of the biasing spring 52, as shown by the two-dot chain line in FIG. Therefore, the engaging portion 5
5 engages with the engagement step portion 49 of the slide plate 39 to hold the slide plate 39 in a lowered state. In this state, when the cassette body 1 is inserted into the cassette storage chamber 7 of the camera body 6 from behind in the direction of the optical axis, the cassette body 1 is placed on the support member 34 of the cassette storage chamber 7. After loading the cassette body 1 into the predetermined position of the cassette storage chamber 7, open/close lid 9
When the lid is closed, the action portion 54 of the lock lever 51 is pressed by the pressing portion 53 of the opening/closing lid 9. Therefore, the lock lever 51 rotates clockwise against the restoring force of the biasing spring 52, and its engaging portion 55 is disengaged from the engaging stepped portion 49 and is held as shown by the solid line in FIG. Ru. When the slide plate 39 is unlocked, the slide plate 39 slides upward by the restoring force of the biasing spring 44. Therefore, the push-up pin 45 penetrates through the through hole 45a and projects upward,
It comes into contact with the bottom 21a of the engaging member 21 in the film winding section 4 of the cassette main body 1. At this time,
The engaging member 21 is urged downward by the compression spring 33, but is pushed up by the restoring force of the urging spring 44, which is stronger than the spring force of the compression spring 33, so that it is engaged by the push-up pin 45. The member 21 rises, and the engaging claw portion 26 of the engaging member 21 engages with the claw portion 47 of the film winding shaft 46. Therefore,
The rotation of the film winding shaft 46 is transmitted to the engaging member 21 via the engaging claw portion 26 that engages with the claw portion 47.
Since the rotation of the engaging member 21 is transmitted to the film winding member 22 via the protrusion 29 and the engaging groove 30, the film 5 in the film supply section 3 can be wound up by the film winding member 22. .

Further, when photographing is completed and the cassette body 1 is to be taken out from the camera body 6, the opening/closing lid 9 of the camera body 6 is first unlocked. Next, the slide plate 39 is slid downward against the restoring force of the biasing spring 44 by appropriate means. As a result, the push-up pin 45 is also lowered, and the engaging member 21 of the cassette body 1 is lowered by the restoring force of the compression spring 28, and the engaging claw portion 26 is moved toward the film winding shaft 46.
It comes off from the claw part 47 of. The upper end of the rotating shaft 25 of the engaging member 21 is flush with the film winding member 22 and the lid 15. Therefore, when the opening/closing lid 9 is opened using its pivot shaft 37 as a fulcrum, the lock lever 51 is rotated counterclockwise by the restoring force of the biasing spring 52, and its engaging portion 55 engages with the engaging stepped portion 49. engage. Therefore, the slide plate 39 is locked in the lowered state, and the cassette main body 1 can be taken out from the cassette storage chamber 7 to the rear.

In this way, when attaching and detaching the cassette body 1 to and from the camera body 6, the cassette body 1 can be attached and detached from the rear of the camera body 6 without moving the film winding shaft 46 up and down as in the conventional case, and the opening/closing lid 9 can be closed after loading. By simply sliding the slide plate 39 in conjunction with the opening/closing lid 9, the engaging claw portion 26 of the film winding section 4 can be automatically engaged with the claw portion 47 of the film winding shaft 46.

Note that in the above embodiment, the engagement member 21
As an engagement means for transmitting the rotation of the film to the film winding member 22, a projection 29 is provided on the rotation shaft 25, and an engagement groove 30 is provided in the fitting hole 22a that fits into the rotation shaft 25. However, the present invention is not limited to the above embodiment, and may be configured as shown in FIG. 8 or 9. That is, the film winding member 2 shown in FIG.
A through hole 56 is bored along the axial direction in the eccentric portion of No. 2,
A rod-shaped body 57 is protruded from the engaging member 21 and is inserted into the through hole 56 so as to be movable in the thrust direction. In addition, FIG. 9 shows a rotating shaft 25 of the engaging member 21.
is an elliptical non-circular column 58, and the fitting hole 22a of the film winding member 22 is a non-circular hole 59 that fits into the non-circular column 28. Although not shown, the rotating shaft 25 and the fitting hole 22
a may be engaged by spline.

As described above, the present invention includes a spool constituting a film winding section formed by a film winding member and an engaging member, and this engaging member is engaged with a film winding shaft of a camera. Since the engaging member is configured to be movable in the thrust direction, the film cassette can be easily attached and detached from the camera without vertically moving the film winding shaft. Therefore, the structure of the film cassette becomes simple and can be made smaller, and the structure of the camera side can also be simplified and made smaller. Further, since the engaging member is formed to pass through the film winding portion and is supported on the upper and lower sides of the cassette body, it does not tilt during installation and has the advantage of stable rotation.

[Brief explanation of drawings]

1 to 7 show one embodiment of the present invention, and FIG. 1 is a plan view of a film cassette;
Figure 2 is a front view, Figure 3 is a partially cutaway rear view of the endoscope camera, Figure 4 is a side view,
Figure 5 is a vertical front view of the film winding section, Figure 6 is a perspective view of the spool, Figure 7 is a partially cutaway side view of the internal structure of the camera, and Figures 8 and 9 are of the spool. FIG. 3 is a perspective view showing different embodiments. 2... bridge, 3... film supply section, 4...
...Film winding section, 20...Spool, 21...
...Engagement member, 22...Film winding member, 46
...Film winding shaft, 29...Protrusion, 30...
Engagement groove, 56... Through hole, 57... Rod-shaped body, 58...
...Non-circular column part, 59...Non-circular hole part.

Claims (1)

[Scope of Claims] 1. In a film cassette in which a film supply section and a film winding section are formed with a bridge in between, a spool constituting the film winding section is connected to a film winding member and a large diameter section in the axial direction. a small diameter portion, the small diameter portion vertically passing through the film winding member, and an engaging portion that engages with a film winding shaft of a camera at an upper end of the small diameter portion, and is movable in the thrust direction. The rotational force of the engaging member is transmitted to the film winding member through the engaging means to wind up the film, and the large diameter portion of the engaging member and the film are 1. A film cassette, wherein the engaging member is arranged with a gap from the film winding member, and the outer diameter of the large diameter portion of the engaging member is the same as or smaller than that of the film winding member. 2. Claim 1, characterized in that the engaging means comprises a protrusion provided in the axial direction of the engagement member and an engagement groove provided on the film winding member and engaged with the protrusion. Film cassette as described. 3. The engaging means comprises a through hole drilled in the eccentric portion of the engaging member in the axial direction, and a rod-shaped body protruding from the film winding member and inserted into the through hole. A film cassette according to scope 1. 4. Claims characterized in that the engaging means is constituted by a non-circular columnar part provided on the engaging member and a non-circular hole part provided in the film winding member and fitted into the non-circular columnar part. The film cassette according to item 1.