JPH0223851B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film cassette having a winding shaft that engages with a spool shaft of a film winding device provided in a camera.

Generally, two methods are used to wind up a film stored in a film cassette so as to be windable. On the one hand, as shown in Japanese Utility Model Publication No. 48-42937, a plurality of recesses are provided on the winding shaft on the film cassette side, a convex winding member is provided on the spool shaft on the camera side, and the two are fitted together. This is a method in which the spools are engaged with each other and the film is wound onto the winding shaft in accordance with the rotation of the spool shaft. On the other hand, the
As shown in No. 2602005, a gear is provided on the winding shaft on the film cassette side, and a gear is also provided on the spool shaft on the camera side, and the two are meshed and engaged with each other, and the film is wound according to the rotation of the spool shaft. This is a method of winding it around a shaft.

In the former method, the concave portion is set to be considerably larger than the convex portion in order to ensure smooth fitting. Therefore, there are cases where the rotation of the spool shaft is not immediately transmitted to the winding shaft. That is, the amount of winding of the film varies with constant rotation of the spool shaft. Therefore, conventionally,
It is necessary to increase the number of frames for blank winding to some extent, which results in the disadvantage of wasting film.

In addition, although the latter method does not have the disadvantages mentioned in the former method, it becomes impossible to use the empty space inside the cassette to provide the fitting part between the recess and the protrusion. . That is, the gears have no choice but to mesh on the outer surface of the film cassette. Therefore, conventional film cassettes have had to be large in size, which is not desirable.

This invention was made in view of the above circumstances,
The object is to provide a film cassette in which the rotation of a spool shaft of a film winding device provided in a camera is immediately transmitted to the winding shaft, and which can be miniaturized.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An endoscope camera equipped with an embodiment of a film cassette according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the endoscope camera includes a camera body 1, and the camera body 1 has a film cassette storage chamber at the rear thereof. This film cassette storage chamber has an opening at the bottom of the camera body 1, and is freely closed by a back cover (not shown). A film cassette 2 is detachably mounted in this film cassette storage chamber. In this embodiment, the film cassette 2 has a total number of 20 film frames 3. As shown in FIG. 2, this film cassette 2 has a film supply chamber 2a and a film winding chamber 2b.
and a bridge 2c connecting these. One end of the film 3 is locked to a winding shaft 2d (shown in FIGS. 4 and 5) of the film winding chamber 2b, and the other end of the film 3 is wound in an unexposed state in the film supply chamber 2a. It has been turned around and contained.

Behind this opening 4a, immediately before the film 3, that is, the film supply chamber 2a of the film cassette 2.
A movable mirror portion 5 is disposed between the film winding chamber 2b and the film winding chamber 2b. The movable mirror section 5 is rotatable between a first position where it blocks the photographing optical path and reflects light from the copying object toward the pentagonal roof prism 6, and a second position where it does not block the photographic optical path. There is. That is, this movable mirror section 5 functions as a mirror shutter of an endoscopic camera. A pentagonal roof prism 6 is disposed above the movable mirror section 5, which receives light from an object when the movable mirror section 5 is in the first position. An eyepiece 4b is provided on the rear surface of the camera body 1 located behind the pentagonal roof prism 6.

A large-capacity capacitor 9 is disposed below the camera body 1 in front of the film supply chamber 2a. Further, above the capacitor 9, a first motor 7 for driving the movable mirror section 5 is arranged. The drive shaft of this first motor 7 is parallel to the rotation axis of the movable mirror section 5. This first
The driving force of the motor 7 is transmitted to the movable mirror section 5 by a mirror drive mechanism (not shown).

A second motor 8 for winding the film is disposed within the camera body 1 in front of the film winding chamber 2b. The drive shaft of the second motor 8 is parallel to the spool shaft 49 of the film winding chamber 2b. The driving force of the second motor 8 is transmitted to a spool shaft 49 via a film winding device 40, which will be described later. Above the second motor 8, a piece count counter 38 for the remaining formula is disposed.

Next, the film winding device 40 will be explained with reference to FIGS. 3 and 4.

The second motor 8 is fixed to the camera body 1 in front of the film winding chamber 2b of the film cassette 2. A small-diameter drive gear 41 is coaxially fixed to the drive shaft of the second motor 8. This drive gear 41 includes a large diameter film feed amount detection gear 4.
2 are meshing. This detection gear 42 is rotatably supported on the camera body 1. A small-diameter gear 43 is fixed above the detection gear 42 and coaxially therewith. This gear 43 has a large diameter first
The intermediate gears 44 are in mesh with each other. This first intermediate gear 44 is rotatably supported on the camera body 1. A second intermediate gear 45 having a small diameter is fixed coaxially to the lower side of the gear 44. This second intermediate gear 45 meshes with a third intermediate gear 46 having a large diameter. This third intermediate gear 46 is rotatably supported on the camera body 1. A fourth intermediate gear 47 having a small diameter is fixed coaxially to the lower side of this gear 46. A driven gear 48 meshes with this fourth intermediate gear 47 . This driven gear 48 is fixed to a spool shaft 49. The spool shaft 49 is rotatably supported on the camera body. This spool shaft 49 is connected to the winding chamber 2
The elastic member 10 is engaged with a concave portion of the elastic member 10 provided on the winding shaft 2d of b, as will be described later, and is configured to wind up the film 3 in accordance with the rotation of the spool shaft 49.

That is, a holding member 50 is provided at the tip of the spool shaft 49 facing the elastic member 10.
In this embodiment, the holding member 50 has an insertion member 51, for example, a plurality of pins, which can be inserted into the recess of the elastic member 10 at its distal end. This holding member 50 is provided at the tip of the spool shaft 4a, rotates therewith, and is slidable along the axial direction thereof. This holding member 50 is a spring 52
is urged outward along the axial direction by.

As shown in FIG. 5, each pin 51 has a sharp tip, and three pins are provided in this embodiment. The pins 51 are arranged at equal intervals on the same circumference. When the film cassette 2 is stored in the cassette storage chamber of the camera body 1, the tip of each pin 51 elastically deforms the elastic member 10 provided in the film winding chamber 2b of the film cassette 2. The member 10 is inserted into the recess.

Here, a plurality of through holes 39, for example eight, are formed at equal intervals along the circumferential direction on the peripheral edge of the film feed amount detection gear 42. These through holes 39
A detection unit 54 is disposed opposite to one of the sensors. The detection unit 54 has a light emitting element and a light receiving element facing each other with the gear 42 as a boundary. When one of the through-holes 39 faces the light-receiving element, the light-emitting element receives light from the light-emitting element through the through-hole 39, and outputs a predetermined signal to notify the rotational position of the drive shaft of the second motor 8. Output. This detection section 54
is for detecting that the film 3 has traveled a certain distance and stopping the drive of the second motor 8 at an arbitrary position.

Film winding device 4 configured as described above
0 and film cassette 2, their mutually related operations will be explained below.

First, the film cassette 2 is installed in the cassette storage chamber of the endoscope camera. As a result of this attachment, as shown in FIG.
The book pin 51 is inserted against the biasing force of the spring 52. By this insertion, the elastic member 10 is elastically deformed corresponding to the inserted portion of the pin 51,
To cave in. That is, the side surface of the insertion part of the pin 51,
The side surfaces of the recessed portion of the elastic member 10 engage with each other in the rotational direction. Therefore, the spool shaft 49 of the camera body 1 and the winding shaft 2d of the film cassette 2 are engaged with each other in the rotational direction, and as the spool shaft rotates, the winding shaft 2d is immediately connected to the winding shaft 2d without any time delay. rotates, and the film 3 is wound up.

The endoscope camera containing the film cassette 2 is connected to an endoscope (not shown) through the opening 4a. In this state, it is possible to observe and photograph using an endoscope, and when the mirror 6 is in the first position before the shutter release operation, as shown in FIG. The light is reflected by the mirror 6 and guided to the eyepiece 4b via the pentagonal roof prism 6, where it is observed. When photographing this subject image, a shutter release operation is performed by pressing a release button (not shown), the mirror 6 is rotated to the second position, and the photographing light from the subject reaches the third side of the film. . This mirror 5a is driven by a first motor 7. In response to a series of reciprocating rotations of the mirror 6 between the first position and the second position, a predetermined portion of the film 2 is exposed to photographing light from the subject, and one frame is photographed. .

After this release operation is completed,
The second motor 8 of the film winding mechanism 40 is automatically driven to rotate the drive gear 41 counterclockwise as shown in FIG. This rotation is transmitted to the driven gear 48 via the gear trains 42 to 47, and the spool shaft 49 rotates counterclockwise.
According to the rotation of this spool shaft 49, each pin 51
The side surface of the inserted portion presses the contacting side surface of the recessed portion of the elastic member 10 in the rotational direction, and as a result, the photographed film 3 begins to be wound into the film winding chamber 2b.

Here, the through hole 3 of the film feed amount detection gear 42 is
The detector 54 detecting the number 9 sends the detected number of through holes 39 as a pulse to a control circuit (not shown), and this control circuit counts the number of pulses. Then, in response to the detection of the total number of film frames from a control switch (not shown), the control circuit controls the number of film frames based on the set number of pulses and the number of frames that have been photographed.
The amount of rotation of the second motor 8 is determined so that the feed is constant regardless of the number of frames, and when the number of pulses from the detector 50 matches the determined number of pulses, a stop signal is sent to the drive circuit. Output. Therefore, the second
The motor 8 stops driving, and the winding of one frame of the film 3 is completed.

Here, the number of pulses determined by the control circuit is such that it gradually decreases as the winding of the film 3 progresses. Even in the case of numbers, the number of pulses is set to be different from each other.
In this way, constant length feeding of the film 3 is realized, in which the feeding of the film 3 is constant regardless of the number of frames to be photographed.

This invention is not limited to the above-mentioned embodiment, but can be modified in various ways without departing from its scope. For example, the elastic member 10 does not need to be made of rubber, and may be of any material that undergoes elastic deformation. Optimally, this elastic deformation should occur sufficiently in the direction of insertion of the pin 51, but not in the direction of rotation.

Further, the number of pins 51 is not limited, and may be at least one. However, when the number of pins is one, this pin is installed at a predetermined distance from the center of rotation. Furthermore, the insertion member 51 that causes the elastic member 10 to undergo elastic deformation is not limited to a pin,
For example, as shown in FIGS. 6 and 7, a blade-shaped member 53 may be used.

According to this embodiment, the elastic members 10 are elastically deformed by the spool shaft 49 of the camera winding device 40 and are engaged with each other along the rotational direction of the film cassette. It is characterized by being fixed to the winding shaft 2d of No. 2. Therefore,
According to this embodiment, the rotational force of the camera's winding device is transmitted to the winding shaft on the film cassette side without delay, making it possible to reduce the number of empty windings, which was conventionally required to be somewhat large. This allows you to save on film. At the same time, the camera winding device and the film cassette can be connected in an empty space inside the cassette, making it possible to downsize the film cassette. On the other hand, rotational force has conventionally been transmitted by gear-to-gear or recess-to-protrusion fitting, but due to the respective rotational positions, the fitting does not occur smoothly, making it difficult to insert the film cassette. It was hot. However, in this embodiment, a needle or blade-like member applies elastic deformation to the elastic member to connect them to each other,
Since rotational force is transmitted through this connection, the cassette can be smoothly inserted into the camera regardless of the rotational position of the elastic member.

As described in detail above, the film cassette according to the present invention includes a film supply chamber for storing unexposed film, a film winding chamber having a winding shaft for winding up exposed film, a film supply chamber and a film cassette for storing unexposed film. A film cassette that is attached to a camera and is equipped with a connection part that connects to a winding chamber at a certain distance, the film cassette being attached to a camera, the film cassette having a winding shaft that engages with a spool shaft of a winding device installed in the camera. A recessed portion recessed in the axial direction is provided near the shaft center, an elastic member is fixed in the recessed portion so as to be integrated with the winding shaft, and the elastic member is elastically deformed by the spool shaft.
The winding shaft is characterized in that it engages with the spool shaft along the direction of rotation. Therefore, according to the present invention, it is possible to provide a film cassette in which the rotation of the spool shaft of the film winding device provided in the camera is immediately transmitted to the winding shaft, and which can be miniaturized.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing the internal structure of an endoscope camera, FIG. 2 is a perspective view showing an embodiment of a film cassette according to the present invention, and FIGS.
The figures are a top view and a sectional view showing the film winding device, and FIG. 5 is a perspective view showing the insertion member taken out.
FIG. 6 is a sectional view showing another embodiment of the invention, and FIG. 7 is a perspective view showing the insertion member shown in FIG. 6 taken out. 2... Film cassette, 2a... Film supply chamber, 2b... Film winding chamber, 2c... Bridge, 2d... Winding shaft, 10... Elastic member, 4
0...Film winding device, 49...Spool shaft.

Claims (1)

[Scope of Claims] 1. A film supply chamber for storing unexposed film; a film winding chamber having a winding shaft for winding exposed film; and a film supply chamber and a film winding chamber connected at a certain distance apart. In a film cassette that is attached to a camera and includes a connecting portion, a recess recessed in the axial direction is provided near the axis of the winding shaft that engages with a spool shaft of a winding device provided in the camera, and a recess is provided in the recess. An elastic member is fixedly fixed to the winding shaft so as to be integral with the winding shaft, and the winding shaft is engaged with the spool shaft along the rotational direction by elastically deforming the elastic member by the spool shaft. film cassette.