JPS5854339A - Film cassette for use in endoscope and device for pressing film - Google Patents

Abstract

PURPOSE:To keep flatness of a film in photographing, and to reduce size of an endoscope camera in the optical axis direction, by providing elastic plates for pressing a film face between feeding and winding chambers or protruding and approaching the film and also forming an exposure opening. CONSTITUTION:Elastic pressing plates 31, 32 are provided on the outlet of a film 21 feeding chamber 22 and the inlet of a film winding chamber 23, respectively, and also they have a function of a frame for defining a prescribed border of the face to be exposed with their ends. The film 21 is pressed on its emulsion side 21A, with the other side of the film 21 pressed by the rail side 33 of an endoscope camera, thus permitting flatness of the film 21 to be held, sharp photographing to be executed, and the size of the camera in the optical axis direction to be reduced because the pressing plates are arranged on the cassette side as compared with the conventional structure where the pressing plates were fixed on the camera side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a film cassette for an endoscope with a pressure plate that forms a flow exposure opening near the entrance and exit of the film, and maintains the flatness of the film during photography. The present invention also relates to a film cassette for an endoscope and a film suppression device that can reduce the size of an endoscope camera in the optical axis direction.

In recent years, endoscopes have been widely used for diagnosis and treatment in the medical field, and for taking photographs for observation and diagnosis.
An endoscopic camera is used.

FIG. 1 shows a schematic front view of an endoscope equipped with an endoscopic camera, and FIG. 2 is a perspective view showing an outline of the structure of a conventional endoscopic camera.

In these figures, an endoscope 1 consists of a flexible insertion section 2 that is inserted into a body cavity, and an operation section 3 for the operator to perform predetermined operations. An illumination optical system and an observation optical system are inserted and installed over the tip 4K, and an observation eyepiece 5 and a universal cord 6 that supplies illumination light to the illumination optical system are connected to the operation section 3. The universal cord 6 is connected to a light source device 7. The endoscope 1 can be used to directly observe the inside of a body cavity by bringing the eye close to the eyepiece 5, or to connect an endoscope camera 8 to the eyepiece 5 to view the inside of the body cavity through the finder 9 of the camera 8. The optical image formed by the observation optical system of the distal end 4 of the endoscope 1 can be observed through the eyepiece 5, and the camera 8 can be photographed by operating the shutter release button lO. There is.

The operating portion 3 includes an operating knob 12 for bending the bending portion 11 interposed between the insertion portion 2 and the distal end portion 4 in the vertical and horizontal directions. A large number of operating means, such as operation buttons 13 for supplying air and water for supplying air and water, are provided in a channel provided inside the insertion section 2.

Therefore, the three operating units are required to have high operating functionality so that each operating means can be easily operated. For this reason, when the endoscope camera 8 is attached and an operation means for photographing is added, the operation becomes complicated due to the large number of extreme pressures. Therefore, unlike a normal camera, the endoscopic camera 8 is
By controlling the exposure time within the light source device 7 and omitting a variable shutter speed mechanism, the device is made as compact and lightweight as possible.

This endoscopic camera 8 is designed so that a back cover 14 can be opened and a film cassette for internal printing can be loaded into a film cassette chamber 15. The winding claw shaft 17, which faces into the film cassette chamber 15, rotates in conjunction with a spur-shaped spool (not shown) in the endoscope film cassette, and rotates the film. It is like being rolled up.

On the other hand, in the case of film traps for endoscopes, cassettes are used because ease of operation is important.

FIG. 3 shows a conventional film cassette for an endoscope. This film cassette is small and lightweight like the Naiku Casting Camera, but it is compatible with ordinary surname film such as 35III.
+Difference from film 9, two film storage chambers (containers) are provided.

That is, the approximately cylindrical supply chamber n that accommodates the unused film 21 (before photography) and the winding chamber n that accommodates the used film 21 (after photography) are located at their cylindrical ends (in the illustration, the upper end). The bridges installed between the two sections are fixed at a certain distance.

The supply chamber 22 and the winding chamber n are hollow cylinders that can be divided into upper and lower parts for loading a film, etc., and the inner cylindrical opening ends are made thinner and are fitted and connected to each other. After the film 21 is loaded, the fitting connection portion is fixed with tapes 25 and 25', respectively.

The film 21 is housed in the inner containers of the supply chamber n and the take-up chamber so as to communicate between the respective film entrances and exits of the winding chamber container. In this case, before use, most of the film 21 is stored in the supply chamber n, and every time a photograph is taken, the film 21 is
1 is moved to the winding chamber 23 side, and a predetermined container #! ! (Number of frames) After photographing, the film 21 in the winding chamber 23 is developed without being rewound. Therefore, the rewind mechanism can be omitted on the camera side, making it possible to reduce the size and weight accordingly and improve operational functionality.

The winding chamber n has a cylindrical recess (not shown) that opens downwardly on the inside so that the aforementioned winding claw shaft 17 can be inserted therein when the endoscope camera 8 is loaded. A spool (not shown) that engages with the claw at the tip of the claw shaft 17 is formed in the upper part of the inner cylinder forming this recess, and when the spool rotates with the rotation of the claw shaft 17, the inner cylinder of the winding chamber unit The film 21, whose body rotates and whose end portion is fixed to the inner cylinder with tape or the like, is wound around the inner cylinder and stored in the winding chamber. An emulsion surface 21A coated with a photosensitive emulsion is formed on one side of the film 21.

When such an endoscopic film cassette is loaded into the aforementioned endoscopic camera 8 and a photograph is taken, light passing through the photographing lens is incident on the emulsion surface 21A between both storage chambers with the optical axis as the central axis. When an optical line is imaged on the exposure aperture of a predetermined area of the emulsion surface 21A, the film 21 becomes as follows:
If it is not pressed with a pressure plate or the like when loaded into the endoscope camera 8, the applied emulsion will cause the emulsion surface 21A to curve (as shown in FIG.
9. Before use, the film 21 is wound and housed in the supply chamber n, so it may curve in the winding direction.

Therefore, when the film 21 is loaded into the endoscopic camera 8 and photographed, the film 21 is pressed with a pressure plate as shown by the reference numeral 26 in FIG. I tried not to.

Since the endoscope camera 8 was provided with the pressure plate 26 in this way, it was not possible to reduce the size of the endoscope camera 8 in the optical axis direction.

This invention was devised in view of the above-mentioned points, and by providing a pressure plate on the side of the film cassette used for endoscopy, the film is pressed during photographing to correct the curvature of the film surface and make it flat. In addition to making it possible to reduce the size of the endoscopic camera in the optical axis direction, by providing the endoscopic camera with a means for pressing the pressure plate, it is possible to keep the film flat during photography and to make it easier to wind up the film. An object of the present invention is to provide a film cassette for an endoscope and a film pressing device that can eliminate the risk of damaging the emulsion surface of the film.

The present invention will be explained below with reference to the drawings.

FIG. 5 shows a first embodiment of an endoscope film cassette according to the present invention.

This example uses tg3. In the film cassette for an endoscope shown in the figure, a supply chamber n of the film 21 and a winding chamber 23
a pressure plate 31 having elasticity at each film entrance and exit;
The feature is that 32 is provided.

That is, the pressure plates 31 and 32 are close to the film entrance/exit opening formed in the shape of a slit in each cylinder of the supply chamber n and the winding chamber n, and are integrated or separate along the film entrance/exit opening (in the vertical direction). It is formed by connecting parts of the body by gluing, etc. Each of these pressure plates 31 and 32 extends laterally as shown in the figure, and is curved so that when separated from the connecting portion of each cylindrical portion, an urging force to press the trap or emulsion surface 21A acts, or each connecting portion is formed in a curved manner. It curves sharply in the lateral direction from the top, so that the tip of the curve presses against the emulsion surface 21A of the film 21.

When taking a photograph, the structure is such that light is incident from the center of the emulsion surface 21A so as to form an optical image on the emulsion surface 21A, and a predetermined exposure aperture of the emulsion surface 21A is exposed. The ends of the round cans extending in the horizontal direction of the zero-pressure plates 31 and 32 are formed so as to function as ring frames that define the boundaries on both sides of a predetermined area to be exposed (of course, this must be done). (It never goes unnoticed.)

When the endoscopic film cassette with the pressure plates 31 and 32 formed in this way is loaded into the endoscopic camera 8,
The film 21 has an emulsion surface 21A (exposed surface) side facing the elastic pressure plates 31 and 32K, and the other side of the film 21 that is not exposed to light is connected to the rail surface 33 (of the endoscope camera 8).
(indicated by phantom lines in FIG. 5), it is pressed (from both sides) and kept flat. According to this example,
Because the pressure plates 31 and 32 are provided on the film cassette side without providing a pressure plate on the inner camera side, when the film cassette is attached to the endoscope camera, even if the film 21 is curled, it will always remain flat. Since the endoscope camera is kept in the same shape, it is possible to take sharp photographs, and the size of the endoscope camera in the optical axis direction can be made smaller than that of a camera in which a pressure plate is provided on the endoscope camera side. Further, since the pressure plates 31 and 32 can also serve as a frame, the number of parts can be reduced.

In another embodiment shown in FIG. 6, the elastic pressure plate 3 described in the first embodiment of the film cassette
1 and 32 are usually provided so as to be separated from the film 21, and when taking a photograph on the endoscope camera side, the film 21
Means for pressing is provided.

That is, in this embodiment, the laterally extending pressure plate 34
, 35 are formed so as to be separated from a position close to the emulsion surface 21A, so that they always exhibit an elastic force in the direction away from the emulsion surface 21A against the force acting on the film 21 surface (emulsion surface 21A) side. It is formed. On the other hand, the endoscopic camera according to the present invention is provided with means for pressing the film 21, which will be described below.

In front of the pressure plates 34 and 35 (in the direction away from the emulsion surface 21A, or in the front a along the optical axis direction), suppression bottles 36 and 37 are movable slide plates made of a magnetic material such as iron. 38: Each is planted.

For example, the supply chamber 22 and the winding chamber 23 are located between the slide plates.
It is arranged so as to be movable back and forth under a plate 39 that supports the bottom of the loaded film 21 at approximately the center of the film 21, and an electromagnet 42 is arranged on the side of the plate. There is.

When current flows through a coil wound around a magnetic material such as an iron core with little hysteresis of the electromagnet 42 placed at the rear and the magnetic material is excited, this slide plate part moves backward (as shown by the arrow). Electromagnet 42 side) K absorption is moved, and the pressing bottles 36 and 37 planted on this slide root press the pressure plates 34 and 35 backward, and the pressure plates 35 push the emulsion surface 21A of the film 21 backward. It is configured to press.

In this case, both ends of the pressing plate 35 are configured to press the emulsion surface 21A at the boundary of the holding frame.

When no current flows through the coil of the electromagnet C, the pressing plate 35 is configured to press and move each pressing bottle 36, 37 forward by its elastic force, and the slide plate side also moves forward at the same time. (The illustration shows this state.

).

The lead wires (conductor wires) connected to both ends of the excitation coil of the electromagnetic right heart are connected to an external power source via a switch 43 indicated by the symbol.

The switch 43 is configured to be turned on and off in response to opening and closing of the back cover (for example, 14) when, for example, an endoscopic film cassette is inserted into the endoscopic camera according to this embodiment.

According to the embodiment configured as described above, the state in which the endoscopic film cassette is inserted into the endoscopic camera provided with the suppression device according to the present invention is as shown in FIG. 6 or 7.
FIGS. 7 and 8 show the case where the case back is not closed and opened, that is, when the switch is turned off and on, in the embodiment shown in FIG. FIG. 8 is a schematic plan view showing the state of the film 21 in the case of the film 21 in relation to the positional relationship with the pressure plate 35 and the pressure bottle 37 (FIG. 8, of course, shows the state inside the back cover).

In the state shown in FIG. 6 or 7, the switch 4
3 is turned on to excite the electromagnetic right heart, the space between the slide plates is attracted and moved to the rear electromagnet C side, and at the same time, the suppression bottle 37 is also moved rearward, and each pressure plate 35
To suppress the pressure backward, each pressure plate A, 35 is a film 21
From the emulsion side 21□I-2゜331
One side will be kept flat. Predetermined number of sheets (number of frames)
When you take a photo and open the back cover, the switch 43Fi turns off 9 and the electromagnet 42 no longer attracts the slide blades, so the elastic force of the pressure plates 34 and 35 causes each suppression bottle x,
It is pushed 3'ya forward, and the suppression bins 36, 37 and slide wings are in the position 11 shown in FIG. 6 (and FIG. 7).

If the switch core is configured to be turned on when exposed to light by operating a shutter or the like, and turned off when the film 21 is wound, the pressure plate 34,
This eliminates the possibility that the emulsion layer 35 may damage the emulsion surface 21A, so that it can function more effectively.

In each of the above-mentioned embodiments, the rail picture frame and the pressure plates 31, 3
Even if the arms 2 and 35 are replaced, substantially the same effect can be obtained.

Further, the aforementioned pressure plates 31, 32, or 34, 35 are not plate-shaped members as shown in the figures, but are slit-shaped.

As described above, according to the present invention, since the film cassette is provided with a pressure plate, it has the advantage that it is smaller in size than the optical axis direction of the endoscopic camera, and the film can be kept flat during photography. has. Furthermore, since the pressure plate is configured to double as a frame, there is an advantage that the number of component parts can be reduced.

In addition, since the endoscope camera is equipped with a means for pressing the pressure plate by operating a switch, it is possible to keep the film flat when taking photographs and to avoid pressing the emulsion side of the film during winding. This prevents the emulsion surface from being damaged during winding. □

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing an endoscope equipped with an endoscopic camera, FIG. 2 is a schematic perspective view showing the structure of a conventional endoscope,
FIG. 3 is a schematic perspective view showing a conventional film cassette for endoscopes, FIG. 4 is a schematic perspective view showing how the film is curved, and FIG. 5 is a first film cassette for internal stitching according to the present invention. FIG. 6 is a schematic perspective view showing another embodiment of the present invention, FIGS. 7 and 8 are for explaining the operation of FIG. 6, and FIG. FIG. 8 is an explanatory plan view schematically showing the back cover in an open state, and FIG. 8 is an explanatory plan view schematically showing the back cover in a closed state.

Claims (3)

[Claims] (1) In an endoscopic film cassette that has a film supply chamber and a film winding chamber, and in which a lightless opening is formed on the film surface between these chambers, the film entrance/exit of the supply chamber and winding chamber is A five-fill cassette for an endoscope, characterized in that an elastic pressure plate is provided that extends from the vicinity to suppress or approach the film surface between these two chambers to form an exposure opening. (2) The film cassette for an endoscope according to claim 1, wherein the pressure plate is made of a member having elasticity in the direction in which the film is pressed. (3) It has a film supply chamber and a film winding chamber, and is provided near the film entrance and exit of the film supply chamber and winding chamber,
In an endoscopic camera into which a film cassette for an endoscopic knife is inserted which has a pressure plate biased in a direction away from the film, a means for pressing the pressure plate toward the film side is provided so that the film can be suppressed during photography. A film suppression device characterized by: