JPS6114037Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to
The present invention relates to a film search device for searching a film on which a map is recorded.

Recently, a driving guidance system has been developed that shows the driving trajectory of a vehicle on a map and informs the driver of the driving position of the vehicle. FIG. 1 shows an example of an on-vehicle information display device in this guidance system. This in-vehicle information display device 1 is installed in a vehicle interior, such as on a dashboard in front of a driver's seat, with a display window 1a facing the driver. A display panel 2 such as a liquid crystal display device is provided in this display window 1a. The vehicle is equipped with a sensor that measures travel distance and direction, and the measured values from these detectors are input to a microcomputer that is also installed on the vehicle, and the microcomputer calculates the vehicle's travel position. , the results are shown on the display panel 2 by a dotted travel trajectory x. Further, a film search device 3 is disposed behind the display panel 2. Each frame of the microfilm in the film search device 3 records a regional map of the entire country of Japan, and from among these frames, the map of the area where the vehicle is currently traveling is selected. . This map is displayed on the display panel 2 by a projection means consisting of a halogen lamp 4, a lens 5, etc.
is enlarged and projected. As a result, the current position of the vehicle can be known by visually observing the map imaged on the display panel 2 and the travel trajectory x traveling on this map.

As a film retrieval device 3 installed in such an on-vehicle information display device 1, there is one having a structure shown in FIG. In this device, a winding shaft 12 and an unwinding shaft 13 are provided on both sides of a film cassette 11, and a micro film F is wound around both shafts.
The frame of microfilm F is exposed from point a. A pulley 14 attached to the winding shaft 12 and a pulley 15 attached to the unwinding shaft 13
A belt 16 is wound between the pulley 14 and the gear 14a, which is integrally formed with the pulley 14 and meshes with a reduction gear, and this reduction gear 17 further meshes with a gear 19 of a stepping motor 18. It's on.

When searching for a desired frame on the microfilm F, the stepping motor 18 is rotated by a drive pulse from a driver circuit (not shown) to wind or rewind the microfilm F. At the same time, a bar code recorded in the margin of the frame appearing in the exposure window 11a is read by an optical detection means (not shown), and based on this read signal, when the desired frame coincides with the exposure window 11a, the stepping motor is activated. 18 is stopped.

However, in the mechanism shown in FIG. 2, when the stepping motor 18 is stopped, both shafts 12, 1
3, the film itself may be rewound due to the tension of the microfilm F wound around it. When such a phenomenon occurs, there will be a misalignment between the exposure window 11a and the frame appearing thereon, and a blank space will be created at the end of the display panel 2. One possible way to deal with this problem is to regularly form small feed holes in the edge of the film and engage sprockets in the small holes to feed the film at a constant speed. However, given the dimensions of the microfilm F, it is extremely difficult to make the small holes in the margins of the frames. Further, since the bar code is to be recorded in the margin of the edge of the film, there is a drawback that if the small hole is provided, there will be no space for the bar code.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned drawbacks of conventional film retrieval devices, and to provide a film retrieval device that can reliably feed the film at a constant speed.

The present invention is equipped with a winding shaft and an unwinding shaft on both sides of the cassette case, and forms a film passage sandwiched between the walls of the cassette case between the two shafts. In a film retrieval device which forms an exposure window and is configured to drive the winding shaft and the rewinding shaft by a motor, a capstan roller rotated at a constant speed by a motor is moved through the film path to open the film exposure window. The film is sandwiched between the abutting body disposed near the capstan roller and the capstan roller, and the film can be fed at a constant speed. The present invention is characterized in that a power transmission member is provided for transmitting the power of one driving motor to the winding shaft and the unwinding shaft.

The present invention uses a small cassette case that has a winding shaft and a rewinding shaft on both sides and a film passage sandwiched between walls. This is an improved version of the film feeder that was used to feed the film, and a capstan roller was installed in the film path to feed the film at a constant speed.

Hereinafter, embodiments of the present invention will be described based on the drawings from FIG. 3 onwards.

FIG. 3 is a perspective view showing a film retrieval device 20 according to the present invention. This film retrieval device 20 is installed in the on-vehicle information display device 1 similarly to the one shown in FIG. A winding shaft 22 and a rewinding shaft 23 are provided on both sides of the cassette case 21, and a microfilm F recording map information and the like is wound around both shafts 22 and 23.
In addition, an exposure window 2 is provided in the center of the cassette case 21.
1a is open, and the film frame appearing in this exposure window 21a is projected onto the display panel 2. A ratchet/slip mechanism 24 is connected to the lower end of the winding shaft 22, and a gear 25a and a pulley 25b are connected to the lower end of the ratchet/slip mechanism 24.
are connected. On the other hand, a pulley 27 is attached to the lower end of the unwinding shaft 23 via a ratchet-slip mechanism 26, and a belt 28 is hung between this pulley 27 and the pulley 25b. Further, the gear 25a meshes with a reduction gear 29, and further, this reduction gear 29 meshes with a drive gear 31 provided at the base of a shaft 30a of a stepping motor 30. A rubber capstan roller 32 is fixed to the tip of the shaft 30a of the stepping motor 30. This capstan roller 32 extends to a position parallel to the exposure window 21a, and as shown in FIG. They are in pressure contact.
The microfilm F can be held between the capstan roller 32 and the contact body 21a.

The ratchet-slip mechanism 24 has a ratchet function and a slip function. The ratchet mechanism connects the gear 25a and the pulley 25b to the winding shaft 22 when rotating in the winding direction (arrow α direction), and connects the gear 25a and the pulley 25b to the winding shaft 22 when rotating in the unwinding direction (arrow β direction).
When the gear 25a and the pulley 25b rotate to the left, the gear 25a and the pulley 25b are separated from the winding shaft 22.
The gear 25a and the pulley 25b are in the winding direction (arrow α
When a load is applied to the winding shaft 22 while the winding shaft 22 is rotating in the direction (the direction of the winding shaft 22), the slip function causes the winding shaft 22 to
The gear 25a and the pulley 25b rotate in a slip manner.
A constant winding tension is generated on the microfilm F. On the other hand, the ratchet/slip mechanism 26 also has a ratchet function and a slip function, and when the pulley 27 rotates in the winding direction (arrow α direction), the connection between the pulley 27 and the rewinding shaft 23 is broken, and when the pulley 27 rotates in the rewinding direction (arrow β direction) and a load is applied to the rewinding shaft 23, the rewinding shaft 23 and the pulley 27 slip due to the slip function. As a result, a constant rewinding tension is generated on the microfilm F when the pulley 27 rotates in the rewinding direction (arrow β direction).

Next, the operation and effects of the film retrieval device according to the present invention will be explained.

When this film retrieval device 20 is mounted on the in-vehicle information display device 1, when a desired map number is input using the operating mechanism, a stepping motor is activated by drive pulses from a driver circuit based on instructions from a controller (not shown). 30 rotates. The rotational force of the stepping motor 30 in the forward and reverse directions acts directly on the microfilm F by the capstan roller 32 as a force. That is, the capstan roller 32 moves in the direction of the arrow α.
When rotated in the direction, this capstan roller 32
The microfilm F held by the contact members 21b is sent out at a constant speed in the winding direction. At the same time, the rotation of the stepping motor 30 is transmitted to the drive gear 31 and the reduction gear 25a. and,
Due to the slip function of the ratchet/slip mechanism 24, the winding shaft 22 winds up the microfilm F within a constant tension. Conversely, when the capstan roller 32 rotates in the direction of the arrow β, the microfilm F is fed out in the unwinding direction. Further, the rotation of the stepping motor 30 is transmitted to the gear 25a via the drive gear 31 and the reduction gear 29, and further, the pulley 27 is rotationally driven in the direction of the arrow β via the pulley 25a and the belt 28. Then, due to the slip function of the ratchet/slip mechanism 26, the rewinding shaft 23 rewinds the microfilm F within a constant tension.

As the microfilm F is wound and rewound as described above, a bar code recorded in the margin of the side edge of each frame is detected by an optical detection means (not shown) provided at the upper or lower part of the exposure window 21a. ). Then, this read signal is input to the controller, and the map number input from the operating mechanism is compared with this input signal.
Then, the frame recording the desired map is placed in the exposure window 21.
When the signal appears at point a, the pulse oscillation to the stepping motor 30 is stopped, and the search operation is completed. Then, the map recorded on the frame appearing in the exposure window 21a is projected onto the display panel 2, and the imaged map and the travel trajectory x are superimposed and can be viewed through the display window 1a.

Further, FIG. 5 shows another embodiment. In this example, a pinch roller 41 is used as the contact body,
This pinch roller 41 is pressed against the capstan roller 32 by a spring 42.

As described above, according to the present invention, the following effects can be achieved.

In a conventional film retrieval device using a small cassette case, which has a winding shaft and a rewinding shaft on both sides and a film passage sandwiched between walls between the two, as shown in FIG. As previously mentioned, the film was fed by driving a winding shaft or a rewinding shaft. By improving this, a capstan roller is placed near the film exposure window provided in the film path, and the capstan roller is brought into surface contact with the film to feed the film. When using a cassette, the film can be reliably fed at a constant speed. Therefore, the film frame can be accurately stopped at the film exposure window, and image shift due to the projector can be prevented.

Since the power of one motor that drives the capstan roller is transmitted to the winding shaft and rewinding shaft, it is possible to start and stop the capstan roller and to start and stop the winding or rewinding shaft. It will be possible to synchronize. That is, when the capstan roller starts or stops feeding out the film, the winding shaft or the rewinding shaft can be rotated or stopped at the same time. Therefore, it is no longer possible to apply unreasonable tension to the film held between the capstan roller and the abutting body by driving the winding shaft or the like. Particularly during retrieval operations in which the film is frequently fed and stopped, it is possible to prevent excessive tension from being applied to the film. In addition, the present invention is directed to a small film cassette that has a winding shaft and an unwinding shaft on both sides, and a film passage sandwiched between walls between them. Since the distance between the capstan roller and the winding shaft (or rewinding shaft) is becoming shorter, if the timing of starting and stopping of the capstan roller and the winding shaft (rewinding shaft) is different, excessive tension will be applied to the film. However, with the present invention, as mentioned above, the capstan roller, the winding shaft, and the rewinding shaft can be started and stopped in synchronization, so that large films can be moved between the capstan roller, the winding shaft, and the rewinding shaft. It becomes possible to effectively prevent tension from acting.

Furthermore, since the capstan roller, the winding shaft, and the unwinding shaft are driven by one motor, the structure is simple and can be manufactured compactly.

Further, as described in claim (2), if the inner wall surface of the cassette case is used as the abutting body, the structure is simple and space is available. on the other hand,
If a pinch roller is used as the contact member as described in claim (3), the film rolling operation will be more stable.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an in-vehicle information display device, FIG. 2 is a perspective view of a conventional film search device, FIG. 3 is a perspective view of a film search device according to the present invention, and FIG.
The figure is a sectional view showing the pressure contact part of the capstan roller.
FIG. 5 is a sectional view showing the pressure contact portion of the capstan roller when a pinch roller is used. 21...cassette case, 21a...exposed window,
22... Winding shaft, 23... Rewinding shaft, 25a,
25b, 27, 28, 29, 31...Power transmission member, 30...Stepping motor, 32...Capstan roller, 21b, 41...Abutting body (41
...Pinch roller), F...Film.

Claims (1)

[Claims for Utility Model Registration] (1) A winding shaft and a rewinding shaft are provided on both sides of the cassette case, and a film passageway sandwiched between the walls of the cassette case is formed between the two shafts. In this film retrieval device, a film exposure window is formed in the film passage, and the winding shaft and the rewinding shaft are driven by a motor. A contact member disposed near the film exposure window in the film passage and facing the capstan roller and the capstan roller sandwich the film so that the film can be fed at a constant speed; . A film retrieval device comprising a power transmission member for transmitting the power of one motor driving the capstan roller to the winding shaft and the rewinding shaft. (2) The film retrieval device according to claim 1, wherein the abutting member is an inner wall surface of a cassette case. (3) The film retrieval device according to claim (1) of the utility model registration, wherein the abutting member is a pinch roller.