JPH09222668A - Film running device and film guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently prevent a film surface from being scratched by rubbing, transferring impression or involving dust in the case of tensioning the film surface with specified pressure by simple constitution. SOLUTION: This device is provided with a film guide 22 having plural through-holes on a guide surface opposed to film 5 or a tape, and a fluid supply means connected to the film guide 22. By outputting specified fluid from the through-holes and forming a fluid layer between the surface of the guide 22 and the film 5, the film 5 is tensioned in a state where the guide 22 does not come in contact with the film 5, and the dust is blown off with the pressure of the fluid, by which the dust is prevented from adhering to the film 5.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. TECHNICAL FIELD The invention belongs to the related art (FIG. 8) Problem to be solved by the invention Means for solving the problem Embodiment of the invention (1) Overall configuration (FIG. 1) (2) Film guide and pneumatic control system (FIGS. 2 to 4) (3) Operation and effects (4) Other embodiments (FIGS. 5 to 7)

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film traveling device and a film guide, and is suitable for application to, for example, a projector.

[0003]

2. Description of the Related Art Conventionally, in a projector, the film is intermittently driven, for example, at 24 frames per second, and each frame on the film is irradiated with light source light at a position where the film is stopped, so that the film is projected on the film. The recorded frame images are sequentially projected on the screen.

In FIG. 8, reference numeral 1 denotes a projector as a whole, and a movie film 5 is driven to run from the film supply reel 2 side to the film take-up reel 4 side through the housing 3. The film supply reel 2 is wound with a movie film 5, and the movie film 5 is housed in the housing 3.
To send out and supply. A film guide 6 is pressed against the movie film 5 supplied into the housing 3. The film guide 6 has a cylindrical portion and a flange portion, and the roller surface of the cylindrical portion that abuts the film surface of the movie film 5 is rotatably supported. The film guide 6 pushes the roller surface of the cylindrical portion against the film surface of the movie film 5 to feed it to the supply side sprocket 7 in a state in which a predetermined tension is added to eliminate slack and the like. The supply-side sprocket 7 has a gear shape, and the movie film 5 is driven at a predetermined rotation speed while fitting teeth in guide holes (not shown) provided at both ends of the movie film 5. Run at a constant speed. The supply-side sprocket 7 sends the movie film 5 to be run at a predetermined speed to the film trap section 8.

The film trap portion 8 is a film film 5
By limiting the position by sandwiching, the image frames of the frame images recorded on the movie film 5 are aligned. The projection unit 9 irradiates the movie film 5 thus aligned with the light source light emitted from the light source 10 via the condenser optical system 11. The flickering blade 12 provided between the film trap section 8 and the projection section 9 performs a shutter operation in synchronization with the frame feed speed of the movie film 5. As a result, the fritker blade 12
The light source light emitted from the projection unit 9 is intermittently shielded, and only when each frame image of the movie film 5 is on the optical axis of the light source light, the light source light is irradiated onto the movie film 5 without being blocked. Let In this way, the light source light radiated on the movie film 5 is
Image light is formed of each image transmitted through the movie film 5 and recorded on the movie film 5. The formed image light is passed through the projection optical system 13 to a screen (not shown).
Projected enlarged. In this way, the image recorded in the movie film 5 is projected on the screen.

The movie film 5 on which an image recorded by the emitted light from the light source is projected on the screen is sent to the film take-up reel 4 side by the frame feed sprocket 14 and the take-up side sprocket 15 to be wound up. . Here, frame feed sprocket 14 and winding side sprocket 1
An audio reproducing unit 16 is provided between the audio reproducing unit 5 and the audio reproducing unit 5.
The movie film 5 sent to the audio reproduction section 16 is
A tension of a predetermined pressure is added by the film guide 17. The film guide 17 has a cylindrical portion and a flange portion, and the roller surface of the cylindrical portion which abuts the film surface of the movie film 5 is rotatably supported. The film guide 17 presses the roller surface of the cylindrical portion against the film surface of the film film 5 to add tension of a predetermined pressure to eliminate slack and the like.
Send to 5. Further, by adding a predetermined pressure tension by the film guide 17, the movie film 5 is pressed against the reproducing section guide 18 and the position thereof is regulated.
The light source 19 irradiates the movie film 5 pressed against the reproducing section guide 18 with light source light. The light receiving element 20 reproduces the audio signal recorded in the movie film 5 by receiving the light source light that is emitted to and transmitted through the movie film 5.

Thus, the projector 1 can reproduce the image recorded in the movie film 5 and project it on the screen, and can also reproduce the audio signal recorded in the movie film 5 in the same manner.

[0008]

By the way, in the projector 1 having such a structure, a tension of a predetermined pressure is added to the movie film 5 by the film guides 6 and 17 so that the running movie film 5 is not loosened. It is done like this. However, since the roller surfaces of the film guides 6 and 17 are pressed against the moving movie film 5 as described above, there is a possibility that the movie film 5 may be damaged by friction with the movie film 5 or the like.

First, the movie film 5 may slip on the roller surface which abuts the film guides 6 and 17 during its running, and scratches the film surface by rubbing against scratches and the like existing on the roller surface. There is a problem that occurs. Secondly, due to the tension added to the movie film 5,
There is a problem that scratches and the like existing on the roller surfaces of the film guides 6 and 17 are transferred to the film surface as indentations and become scratches. Thirdly, dust generated by the components inside the projector 1 and dust floating in the apparatus, as well as dust caused by running abrasion of the roller surfaces of the film guides 6 and 17 by the movie film 5, is generated between the film surface and the roller surface. There is a problem of being caught and causing scratches on the film surface. In this case, even if scratches or the like do not occur, normal reproduction cannot be performed simply because dust or the like adheres to the film surface.

When these problems occur, the images and sounds recorded on the movie film 5 cannot be reproduced normally. In addition, the occurrence of such scratches leads to deterioration of the recording surface of the movie film 5, leading to a reduction in the number of times of screening and a shortening of the life of the movie film 5.

In order to avoid these problems, the roller surfaces of the film guides 6 and 17 are required to have extremely high surface accuracy. However, due to variations in processing accuracy, variations in molding, etc., scratches caused by handling, scratches caused by friction during traveling, and scratches caused by dust etc. Moreover, it is difficult to maintain perfect surface accuracy.

Further, the film guides 6 and 17 are provided with a nipping portion so as not to leave a fillet portion which causes unstable running and deformation of the movie film 5, thereby finishing the roller surface of the cylindrical portion with high accuracy. It was done like this. But,
In this case, the nib ends are concentrated and pressed against the film surface, and the problem of scratching the film surface due to scratches or indentations cannot be solved. Therefore, it is considered that the roller surface is finished with high precision and easily by eliminating the nig portion and forming the cylindrical portion and the flange portion separately. However, in this case, the maintenance work and the like becomes complicated due to the increase in the number of parts, and the problem that it is difficult to maintain the surface accuracy of the roller surface due to the factors described above cannot be solved.

The present invention has been made in consideration of the above points, and has a simple structure and is efficiently produced by rubbing, impression transfer or dust entrapment when a tension of a predetermined pressure is applied to the film surface. An object of the present invention is to propose a film traveling device and a film guide that can prevent the occurrence of scratches.

[0014]

In order to solve the above problems, the present invention provides a film guide having a plurality of through holes on a guide surface facing a film or a tape, and a fluid for connecting to the film guide. Provide a supply means.

A predetermined fluid supplied from the fluid supply means is output from the through hole to form a fluid layer between the guide surface facing the film or tape and the film, so that the film guide is not in contact with the film. The tension can be added to the film, and the dust can be prevented from adhering to the film by blowing off the dust by the pressure of the fluid.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) Overall Structure FIG. 1 in which parts corresponding to those in FIG. 8 are designated by the same reference numerals shows a projector 21 as a whole, excluding film guides 22 and 23 for adding a predetermined pressure tension to the movie film 5. The projector 1 has the same configuration as that of the projector 1 in FIG. That is, the projector 21 drives and runs the movie film 5 from the film supply reel 2 side to the film take-up reel 4 side through the housing 3. The film guide 22 provided in the housing 3 feeds the movie film 5 supplied from the film supply reel 2 to the supply side sprocket 7 in a state in which tension of a predetermined pressure is added to eliminate the slack. The supply-side sprocket 7 has a gear shape, and the movie film 5 is driven at a predetermined rotation speed while fitting teeth in guide holes (not shown) provided at both ends of the movie film 5. The vehicle is run at a constant speed and sent to the film trap section 8.

The film trap section 8 is a film film 5
By limiting the position by sandwiching, the image frames of the frame images recorded on the movie film 5 are aligned. The projection unit 9 irradiates the movie film 5 thus aligned with the light source light emitted from the light source 10 via the condenser optical system 11. Fritker blade 1 provided between the film trap section 8 and the projection section 9
Reference numeral 2 indicates that each frame image of the movie film 5 is on the optical axis of the light source light by intermittently blocking the light source light emitted from the projection section 9 by performing a shutter operation in synchronization with the frame feed speed of the movie film 5. Only when you come to the movie film 5
Irradiate on top. The light source light radiated on the movie film 5 in this way passes through the movie film 5 and
Form image light consisting of each image recorded above. The formed image light is enlarged and projected on a screen (not shown) via the projection optical system 13, and the image recorded in the movie film 5 is projected on the screen.

The movie film 5 on which an image recorded by the emitted light from the light source is projected on the screen is sent to the film take-up reel 4 side by the frame feed sprocket 14 and the take-up side sprocket 15, and is taken up. . Also, the frame feed sprocket 14 and the winding side sprocket 15
An audio reproducing unit 16 is provided between the audio recording medium and the audio recording medium, and reproduces the audio signal recorded in the movie film 5. The film guide 23 provided in the audio reproducing section 16 is
A tension of a predetermined pressure is applied to the movie film 5 to send it out to the winding side sprocket 15 in a state where slack is eliminated, and at the same time, the movie film 5 is pressed against the reproducing section guide 18 to regulate the position. The light source 19 irradiates the movie film 5 pressed against the reproducing section guide 18 with light source light. The light receiving element 20 reproduces the audio signal recorded in the movie film 5 by receiving the light source light that is emitted to and transmitted through the movie film 5.

(2) Construction of Film Guide and Pneumatic Control System The film guides 22 and 23 have a cylindrical shape in which one opening end is closed, and pneumatic pressure for supplying air of a predetermined pressure to the other opening end. The control system is connected. The film guides 22 and 23 add a predetermined pressure tension to the movie film 5 (FIG. 8) arranged at the opposite positions by blowing out the air flow supplied from the pneumatic control system from the peripheral side surface. The structure of the film guide 22 is shown below. Since the film guide 23 has the same structure as the film guide 22, the description thereof will be omitted.

In the film guide 22 shown in FIG.
Stepped flange portions 25 corresponding to the width of the motion picture film 5 are provided at both ends of a cylindrical guide portion 24 having one open end closed. In addition, on the peripheral side surface of the guide portion 24, about 1 [m
A predetermined number of circular through holes 26 having a diameter of m] are formed. Furthermore, the inward surface side of each flange portion 25 is a film film 5
In order to prevent edging due to the edges and to stabilize the film guide, a part is formed so as to escape toward the outer periphery in a tapered shape to the outside (not shown).

The rear middle portion of the guide portion 24 is attached to the tension arm 27, and one end portion of the flexible air introducing passage 28 made of nylon tube piping material is connected to the rear end portion. There is. Air introduction path 28
The other end is connected to an air delivery device 29, which is a compressor, and introduces the air delivered from the air delivery device 29 into the guide portion 24.

Here, as shown in FIG. 3, the tension arm 27 to which the guide portion 24 is attached is an arm portion having a predetermined length. The tension arm 27 is used for the projector 2
1 (FIG. 1) is rotatably supported by a shaft 30 press-fitted and fixed in a predetermined housing position. As a result, the rotation of the tension arm 27 moves the guide portion 24 attached at a position separated from the shaft 30 by a predetermined distance. Therefore, by rotating the tension arm 27 in the direction of the arrow shown in the drawing, the entire film guide 22 can be moved, and thus a predetermined amount of tension can be added to the movie film 5.

FIG. 4 shows an air pressure control system for supplying air from the air delivery device 29 to the film guide 22. The air delivery device 29 is a compressor, and the film guide 2
The second guide portion 24 is connected via an air introduction passage 28. The air supplied from the air delivery device 29 is set to a predetermined air pressure by the primary side pressure valve 31 and the secondary side pressure valve 32, and the supply amount is controlled to the required flow rate by the flow rate control valve 33. Is introduced into the guide portion 24. Here, in the air introduction passage 28 connected to the guide portion 24,
A pressure detector 34 is arranged. The pressure detector 34 detects the air pressure in the guide portion 24 and gives the detection result to the pressure detection circuit 35. The pressure detection circuit 35 compares the detection result with a preset air pressure and notifies the control circuit 36 of the comparison result. The control circuit 36 controls the flow rate control valve 33 based on the notified comparison result to adjust the flow rate of the supplied air.

(3) Operation and Effect In the above-mentioned structure, the film guides 22 and 23 provided on the projector 21 are pressed against the moving film 5 by the rotation of the tension arm 27. Thereby, the film guides 22 and 23 regulate the film surface direction of the movie film 5 by the guide portion 24, and regulate the film position by the flange portion 25.
The running of the movie film 5 can be guided.

At this time, the film guides 22 and 23 are
Air having a predetermined pressure supplied from the air delivery device 29 into the guide portion 24 is output from the through hole 26. The output air forms an air layer between the guide portion 24 and the movie film 5. As a result, direct contact between the movie film 5 and the film guides 22 and 23 can be suppressed, and dust can be blown off by the air pressure to prevent the dust from being caught and attached to the film surface. Thus, it is possible to prevent the film guides 22 and 23 from being scratched, and film scratches due to the inclusion of dust, adhesion to the film surface, and the like. Further, at this time, the tapered relief provided on the inward surface side of the flange portion 25 can prevent abrasion due to the film edge and guide the movie film 5 in a stable and reliable manner.

Further, since the film guides 22 and 23 can be added with tension in such a state that they are not in contact with the film surface of the movie film 5, it is necessary to request the peripheral side surface of the guide portion 24 to have high surface accuracy. It can disappear and can be easily processed and handled. In this case, maintenance of surface accuracy can be easily achieved. Further, the air introduction path 28 connected to the film guides 22 and 23 is formed of a flexible member, so that the load is reduced when the tension arm 27 is rotated so as not to obstruct the rotation. ing.

A method of applying the present invention to a film guide having a conventional cylindrical guide portion and a shaft portion that rotatably supports the guide portion is also conceivable. That is, the air flow introduced into the guide portion via the shaft portion is output from the plurality of through holes provided on the peripheral side surface of the guide portion. Also in this case, the same effect as the above case can be obtained. However, in this case, the guide portion that outputs the airflow to the film surface freely rotates as the film travels. For this reason, it is necessary to uniformly provide the guide portion with through holes for outputting an air flow over the entire peripheral side surface, resulting in useless air output except for the portion facing the film surface. Therefore, the efficiency of the air output is reduced as a whole, which causes a problem that it is difficult to obtain a desired air pressure to a necessary place.

Further, in the case of such a structure, since the guide portion is configured to be rotatable, it is necessary to seal the structural gap between the two. However, complete sealing is difficult, and there is a problem in that air leakage occurs and the air output decreases. Further, there is a problem that the seal portion is deteriorated by the rotation of the guide portion. Further, in order to make the guide portion rotatable, it is necessary to provide a highly accurate bearing and a seal portion, and it is necessary to connect the air introduction path to the shaft portion in consideration of the rotation of the guide portion. Therefore, the number of parts increases and the structure becomes complicated, and maintenance becomes difficult. Furthermore, since the guide portion is configured to be rotatable as described above, the shape is limited to the cylindrical shape, and the degree of freedom in design is narrowed.

In the above-mentioned embodiment, since the guide portion 24 does not rotate regardless of the traveling of the film, the through hole 26 is selectively or limited only to the portion facing the movie film 5. The air output can be effectively utilized. Also, because of the structure that does not rotate,
It is possible to prevent air leakage without requiring the configuration of the bearing and the seal portion and to form the device with a simple configuration, thereby improving the reliability.

According to the above construction, the film guides 22 and 23 each having the one open end closed and the guide portion 24 having the plurality of through holes 26 communicating with the inner space on the guide surface are provided. An air delivery device 29 for supplying air of a predetermined pressure is provided to the film guides 22 and 23, and the air delivered from the air delivery device 29 is output from the through holes 26 provided in the film guides 22 and 23, so that the film guide 22 An air layer is formed between the peripheral side surfaces of the film 23 and 23 and the film film 5. As a result, tension can be added to the movie film 5 in a state where the film guides 22 and 23 and the movie film 5 are not in contact with each other, and dust is adhered to the movie film 5 by blowing dust by the pressure of air. Thus, it is possible to realize the projector 21 which can prevent the scratches caused by scratching, impression transfer, or dust entrainment when a tension of a predetermined pressure is applied to the film surface of the movie film 5.

(4) Other Embodiments In the above-described embodiments, the case where the invention is applied to the projector 21 has been described. However, the present invention is not limited to this, and a belt-shaped film or film while adding a tension of a predetermined pressure is used. If it is a device for running a tape, it may be applied to other devices such as a video tape recorder or a movie film recording device.

In the above-mentioned embodiment, the case where the cylindrical portions 24 of the film guides 22 and 23 are provided with the plurality of through holes 26 to output the air is described. A cylindrical portion capable of outputting air may be provided without providing a through hole by forming a member that can be ventilated from the inside to the front side, such as a coarse sintered metal, ceramics, or a mesh material.

Further, in the above-mentioned embodiment, the case where the cylindrical through hole 26 of the film guides 22 and 23 is provided in the cylindrical portion 24 is described, but the present invention is not limited to this, and may be, for example, a slit shape. A through hole having another shape may be provided.

Further, in the above-described embodiment, the flange portions 2 are provided at both ends of the cylindrical portion 24 of the film guides 22 and 23.
I described the case where 5 was placed facing inward,
The present invention is not limited to this, and may be provided on only one side.

Further, in the above-mentioned embodiment, the case where the compressor is used as the air delivery device 29 has been described, but the present invention is not limited to this, and an air cylinder or a blower device or the like may be used.

In the above embodiment, the case where the air is output from the film guides 22 and 23 to form the air layer between the film films 5 is described, but the present invention is not limited to this, and the film film is not limited to this. It is also possible to output a gas or liquid other than air, such as an inert gas, which does not affect the above.

Further, in the above-mentioned embodiment, the case of the film guides 22 and 23 having the cylindrical guide portion 24 has been described, but the present invention is not limited to this, and outputs a predetermined fluid to the film surface of the movie film. The guide portion may be formed in any shape as long as it has a suitable shape. In FIG. 5, reference numeral 37 denotes a guide portion as a whole, which has a shape suitable for folding the traveling direction of the film to about 180 °. That is, the guide portion 37 is formed in a D-shape as a whole by processing the adjacent two corner portions of the quadrangular prism into a saddle shape to form a guide surface. The guide portion 37 has a void inside and closes one open end. The guide portion 37 has a saddle-shaped guide surface formed with a plurality of through-holes communicating with internal voids, and outputs a predetermined fluid from the through-holes.

In FIGS. 6 and 7, numeral 38 indicates a guide portion as a whole, and the film traveling direction is about 90 [°].
The shape is suitable for folding back. That is, the guide portion 38 is formed by processing a predetermined corner portion of a square pole into an R shape to form a guide surface. The guide portion 38 has a void inside and closes one open end. Further, the guide portion 38
Has a plurality of through holes communicating with the internal voids formed in the guide surface, and outputs a predetermined fluid from the through holes 37. In this way, by forming the guide portion in a shape having a curvature only at a portion corresponding to the running state of the film, it is possible to easily manufacture and to improve the strength. Further, by providing a means for adding tension to the movie film in a separate configuration, the guide portion 37 or 38 can be provided at the corner portion of the housing, the support column or the like, and an efficient device design can be realized.

[0040]

As described above, according to the present invention, a film guide having a plurality of through holes on the guide surface facing the film or tape, and a fluid supply means connected to the film guide are provided to allow the film to penetrate. A predetermined fluid is output from the hole to form a fluid layer between the guide surface and the film. This makes it possible to add tension to the film without contacting the film guide, and to prevent dust from adhering to the film by blowing off the dust by the pressure of the fluid, thus providing a simple structure and efficient operation. It is possible to realize a film traveling device and a film guide which can prevent the occurrence of scratches caused by scratching, impression transfer or dust entrainment when a tension of a predetermined pressure is applied to the film surface.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a projector according to an embodiment.

FIG. 2 is a side view showing the configuration of the film guide according to the embodiment.

FIG. 3 is a front view provided for explaining addition of tension to a film by a film guide.

FIG. 4 is a block diagram showing the configuration of a pneumatic control system.

FIG. 5 is a side view showing a film guide according to another embodiment.

FIG. 6 is a side view showing a film guide according to another embodiment.

FIG. 7 is a perspective view for explaining the regulation of the traveling direction of the film by the film guide of another embodiment.

FIG. 8 is a side view showing the configuration of a conventional projector.

[Explanation of symbols]

1, 21 ... Projector, 2 ... Film supply reel, 3 ...
... Housing, 4 ... Film take-up reel, 5 ... Movie film, 6, 17, 22, 23 ... Film guide, 7
...... Supply side sprocket, 8 …… Film trap part,
9 ... Projection unit, 10, 19 ... Light source, 11 ... Condenser optical system, 12 ... Fritker blade, 13 ... Projection optical system, 14 ... Frame feed sprocket, 15 ... Winding side sprocket, 16 …… Audio playback section, 18 ……
Playback section guide, 20 ... Light receiving element, 24, 37, 38 ...
… Guide part, 25 …… Flange part, 26 …… Through hole, 2
7 ... Tension arm, 28 ... Air introduction path, 29 ...
… Air delivery device, 30 …… Shaft, 31 …… Primary pressure valve,
32 ... Secondary pressure valve, 33 ... Flow control valve, 34 ...
Pressure detector, 35 ... Pressure detection circuit, 36 ... Control circuit.

Claims (8)

[Claims] 1. A film running device for running a belt-shaped film or tape while applying a tension of a predetermined pressure by the film guide, wherein the film guide is provided with a plurality of guide surfaces facing the film or tape. A film running device comprising a through hole, wherein a predetermined fluid supplied from a fluid supply means is output from the through hole to add the tension of the predetermined pressure to the film or tape. 2. The film running device according to claim 1, wherein the guide surface has a curved surface shape corresponding to at least a winding angle of the film or tape. 3. The film running device according to claim 1, wherein the guide surface is provided with a stepped portion having a flange shape at positions corresponding to both ends in the width direction of the film or tape. 4. The film traveling apparatus according to claim 1, wherein the fluid is gas or liquid having a predetermined pressure. 5. A film guide adapted to apply a tension of a predetermined pressure to a belt-shaped film or tape, wherein the film guide has a plurality of through holes on a guide surface facing the film or tape. A film guide characterized in that the tension of the predetermined pressure is added to the film or tape by outputting a predetermined fluid supplied from the fluid supply means from the through hole. 6. The film guide according to claim 5, wherein the guide surface has a curved surface shape corresponding to at least a winding angle of the film or tape. 7. The film guide according to claim 5, wherein the guide surface is provided with flange-like stepped portions at positions corresponding to both ends in the width direction of the film or tape. 8. The film guide according to claim 5, wherein the fluid is a gas or a liquid having a predetermined pressure.