JPH0522226B2 - - 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 top 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 purpose of the present invention is to provide a film cassette in which the engaging member is movable in the thrust direction so that the film cassette can be easily attached to and removed from the camera, and the camera can be made smaller. be.

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 described in detail with reference to FIGS. 2 and 5. 10 is a lower case, and 11 is an upper case. This lower case 10 has a first cylindrical section 12 forming the film supply section 3 and a second cylindrical section 12 forming the film winding section 4.
A cylindrical portion 13 is integrally molded with the bridge 2. Further, the case 11 is provided with lids 14 and 15 that close the upper openings of the first and second cylindrical parts 12 and 13. moreover,
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 edge of the opening 16. In addition, the lid body 15
Also, an opening 18 having a larger diameter is provided opposite to the opening 16, and a jetty 19 projecting downward is provided at the opening edge of the opening 18. A spool 20 is provided between the openings 16 and 18.
are rotatably fitted. This spool 20
It is composed of an engaging member 21 made of an inner cylinder and a film winding member 22 made of an outer cylinder.The annular groove 23 provided at the lower part of this engaging member 21 fits into the jetty 17, and the film winding member 21 is made of an inner cylinder. An annular groove 24 provided in the upper part of the winding member 22 fits into the jetty 19. The bottom portion 25 of the engaging member 21 is exposed through the opening 16, and an engaging claw portion 26 exposed through the opening 18 is provided on the upper portion thereof. In addition, the film winding member 22
The upper end portion is interposed between the jetty 19 and the engaging member 21, and the lower end portion is inserted into a guide groove 27 provided at the bottom of the second cylindrical portion 13, and is inserted into the outer peripheral portion of the film winding member 22. Formed film storage chamber 2
8 is shielded from light from the outside. Further, a polygonal portion 60 whose axial cross section is, for example, a quadrilateral is provided on a portion of the outer circumferential wall of the lower end portion of the engaging member 21 . Further, the film winding member 22 corresponding to the polygonal portion 60 is provided with a polygonal hole 59 having a rectangular cross section, for example, into which the polygonal portion 60 is fitted so as to be movable in the axial direction. That is, the engagement member 2
1 is non-rotatably engaged with the film winding member 22 and is configured to be movable in the thrust direction. In this case, the stroke of the engaging member 21 in the thrust direction is the annular wall 21a of the engaging member 21.
and the depth of the polygonal hole 59 of the film winding member 22 that engages with the hole. Further, a vertical gap 31 is provided between the engaging member 21 and the film winding member 22, and this gap 3
1 has an upper end connected to a stepped portion 22 of a film winding member 22.
b. A compression spring 32 whose lower end is supported by the stepped portion 21b of the engaging member 21 is interposed, and the film winding member 2
2, the engaging member 21 is always urged downward, that is, in the direction in which the engaging claw portion 26 retracts from the opening 18. Therefore, the upper surface of the engaging member 21 is held flush with the film winding member 22 and the lid 15.

Next, the camera body 6 will be described in detail based on FIG. 6. 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 lower end of the opening/closing lid 9 is pivotally attached to this pivot shaft 37, so that the opening 8 of the cassette storage chamber 7 can be opened and closed. 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 on the outer surface of the support wall 38, and the horizontal plate 41 is on the support member 3.
They are facing each other at the bottom of 4. Furthermore, the vertical plate 40 of the slide plate 39 has elongated holes 42 in the vertical direction,
42 are bored, and pins 43, 43 protruding from the support wall 38 are inserted into these long holes 42, 42. Therefore, the slide plate 39 has long holes 42 and 4.
It is vertically slidably supported by pins 43, 43 that engage with 2, and is constantly urged upward by a biasing spring 44. Further, a push-up pin 45 is provided protrudingly on the horizontal plate 41 of the slide plate 39, and a through hole 45a is provided in the support member 34 facing the push-up pin 45.
is drilled. And this push-up pin 4
5 is a cassette main body 1 loaded onto a support member 34;
When the slide plate 39 rises, it comes into contact with the bottom part 25 of the slide plate 39, so that the engagement member 21 can be pushed up against the restoring force of the compression spring 33. ing. 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 lever 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 54 is provided with an operating part 54 that faces the 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 lock lever 51 is closed, the operating 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 engaging member 21 in the film winding section 4 of the cassette main body 1. At this time, the engaging member 21
is biased downward by the compression spring 33, and is pushed up by the restoring force of the biasing spring 44, which is strong due to the spring force of the compression spring 33, so the engagement member 21 is raised by the push-up pin 45. , the engaging claw portion 26 of the engaging member 21 is connected to the film winding shaft 46.
It engages with the claw portion 47 of. 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.
1 is transmitted to the film winding member 22 via the engagement claw 31, so that 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 also descends, and the engaging member 21 of the cassette body 1 descends due to the restoring force of the biasing spring 33, so that the engaging claw portion 26 moves toward the film winding shaft 46.
It comes off from the claw part 47 of. The upper end of the engaging member 21 is flush with the film winding member 22 and the lid 15. Therefore, the opening/closing lid 9 is moved to its pivot shaft 37.
When the lock lever 51 is opened using the fulcrum as a fulcrum, the lock lever 51 rotates counterclockwise by the restoring force of the biasing spring 52, and its engaging portion 55 engages with the engaging stepped portion 49.
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, after loading, the opening/closing lid 9 is simply closed, and the engaging claw portion 2 of the film winding section 4 is moved by the sliding of the slide plate 39 interlocking with the opening/closing lid 9.
6 can be automatically engaged with the claw portion 47 of the film winding shaft 46.

As explained above, the spool constituting the film winding section is formed of a film winding member and an engaging member that engages with a film winding shaft of a camera, and the engaging member has a polygonal cross section in the axial direction. and a polygonal hole into which the polygonal part of the engaging member is fit movably in the axial direction is formed in the film winding member.
To easily attach and detach a film cassette to and from a camera without vertically moving the film winding shaft. Therefore, the structure on the camera side is simplified and the camera can be made smaller.

[Brief explanation of the drawing]

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,
FIG. 5 is a longitudinal sectional front view of the film winding section, FIG. 6 is a partially cutaway longitudinal sectional side view showing the internal structure of the camera, and FIG. 7 is a transverse plan view taken along the line of FIG. 6. 2... bridge, 3... film supply section, 4...
...Film winding section, 20...Spool, 21...
...Engagement member, 22...Film winding member, 46
... Film winding shaft, 59 ... Polygonal hole, 6
0...Polygonal part.

Claims (1)

[Claims] 1. In a film cassette in which a film supply section and a film winding section are formed with a bridge in between, the spool constituting the film winding section is engaged with a film winding member to which the film is fixed and a film winding shaft of a camera. an engaging member, the engaging member has a polygonal section in the axial direction, and the polygonal part of the engaging member is movable in the axial direction on the film winding member. A film cassette characterized by forming a polygonal hole into which the film cassette is inserted.