JPH03226728A - Roll film carrier - Google Patents

Abstract

PURPOSE:To inhibit the feeding stop of a microfilm owing to that its emulsion surface side is attracted to a pressing glass by changing the position of the microfilm feeding surface by a mechanism for switching the position of the feeding surface of the film and pressing the non-emulsion surface side of the microfilm against the pressing glass. CONSTITUTION:When the image of the microfilm 1 is perused, or when retrieval is performed while perusing the image, a pair of pressing glasses 9 and 10 is in a closed state. In the case that the retrieval is performed while perusing the microfilm 1, that means, in the case that the film 1 is fed at a low speed or at an extremely low speed while keeping the pair of pressing glasses 9 and 10 closed, the position of the feeding surface of the film 1 is changed by the mechanism for switching the film feeding surface position so that the non-emulsion surface side of the film 1 may come into contact with one of the pair of the pressing glasses 9 and 10 (for example, in the case that the non-emulsion surface looks upward, so that it may come into contact with the upper glass 9, and in the case that it looks downward, so that it may comes into contact with the lower glass 10). Thus, the attraction of the emulsion surface side of the microfilm to the pressing glass does not prevent the film from being fed irrespective of the emulsion side direction of the microfilm.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a roll film carrier used in microreaders, reader printers, and other image projection devices.

(Prior Art) A lary roll film carrier used in a microreader, a reader printer, etc. is provided with a pressure-bonding glass portion for sandwiching a microfilm in an image projection optical path for projecting an image on the microfilm. The indentation glass section consists of an upper glass and a lower glass, and generally the upper glass is a fixed glass and the lower glass is a movable glass. The lower glass is provided with a gap material on both sides in the microfilm conveyance direction to provide a gap slightly larger than the thickness of the microfilm, and the lower glass presses the microfilm toward the upper glass to remove the microfilm. It is positioned within the depth of focus of the projection lens to obtain a stable projected image. When the microfilm is conveyed at a low speed or an extremely low speed in a closed state, a problem may occur in which the microfilm is adsorbed to the surface of the pressure-bonded glass and the conveyance stops. This kind of problem is caused by insufficient drying of the microfilm after development, and if the stabilizer remains in the emulsion layer, the stabilizer tends to become sticky when it contains water. Therefore, when the emulsion surface comes into contact with the bonded glass, it becomes easily adsorbed to the bonded glass. In order to eliminate these problems, a structure has been developed in which the surface of the pressure-bonded glass is made uneven to the extent that it does not affect image projection, thereby reducing the contact area between the pressure-bonding glass and the microfilm and preventing the two from adhering to each other. there were.

(Problems to be Solved by the Invention) However, although the above-mentioned problems are improved to some extent with the conventional configuration, it has been experienced that the above-mentioned problems still occur in a high-temperature and humid environment. In addition,
According to the inventor's confirmation regarding the above problem,
It has also been discovered that when the emulsion surface is reversed, the above problem does not occur because the emulsion surface hardly comes into contact with the bonded glass.

The problem to be solved by the present invention is to provide a roll film carrier having a transport mechanism that prevents the emulsion surface of the microfilm from adhering to the bonded glass and hindering transport, regardless of the direction of the emulsion surface of the microfilm. There is a particular thing.

(Means for Solving the Problems) In view of the above-mentioned problems, the present invention provides a roll film carrier used in an image projection device for projecting an image on a microfilm. , a gap material for securing a gap larger than the thickness of the microfilm between the pressure-bonded glasses when the pressure-bonded glasses are bonded together; The present invention is characterized by comprising a film conveying surface position switching mechanism that can change the position so that the non-emulsion surface side of the microfilm comes into contact with one of the pressure-bonded glasses of the pair of pressure-bonded glasses.

(Function) In the image projection device, once the microfilm is set on the roll film carrier, it can be loaded, searched, viewed,
Rewind etc. will be performed.

When viewing microfilm images or performing a search while viewing them, the crimp glass pair is in a closed state. When searching while viewing the microfilm, i.e., when transporting the film at low or very low speed with the crimp glass pair closed, the non-emulsion side of the microfilm comes into contact with one glass of the crimp glass pair (e.g. The film transport surface position switching mechanism changes the position of the film transport surface so that if the emulsion surface is on the upper side, it contacts the upper glass, and if it is on the lower side, it contacts the lower glass. .

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings. Fig. 2 shows a schematic configuration diagram of a roll film carrier. As shown in the figure, a microfilm (hereinafter referred to as film) 1 is wound around a supply reel 2 in the form of a roll.

The film 1 unwound from the supply reel 2 passes through a crimping section P, which is a part of the image projection optical path S, and is then wound onto a take-up reel 3.

The supply reel 2 is rotationally driven in two directions, that is, in the direction in which the film 1 is fed out and in the direction in which it is wound up, by a drive shaft 18 driven by a supply reel drive motor (not shown). Similarly, the take-up reel 3 is driven to rotate in two directions, forward and reverse, by a drive shaft 19 driven by a take-up reel drive motor (not shown).

Between the supply reel 2 and the pressure bonding section P, a feed drive roller 5 and its auxiliary roller 4, which are rotated only when the film is fed out, a pair of feed-side film guides 6, an encoder roller 7 and its auxiliary roller 8 are arranged. It is set up. On the other hand, a take-up film guide 12 having an 11-degree pair of guide rollers is disposed between the pressure bonding portion P and the ticket reel 3.

The image projection optical path S includes a light source 13, a mirror aperture, a condenser lens group I5, and a crimp glass pair 9 that is a component of the crimp part P.
, 10, a projection lens 16, and a screen 17.

FIG. 1 shows a perspective view of the crimped glass pair peripheral portion of the roll film carrier according to the present invention, that is, the crimped portion P. Here, in the crimp glass pair 9.1θ, the upper glass 9 is fixed, whereas the lower glass 10 is held by a lower glass holding plate 21, and the lower glass holding plate 21 is pivoted by a crimp solenoid 22. It is designed to rotate around a support pin 23. On both sides of the lower glass IO in the film conveyance direction, Mylar 24 with a thickness within 10 focal depths of the film is pasted so that a gap slightly larger than the film thickness is created between the lower glass IO and the upper glass 9 during pressure bonding. It's attached. The lower glass holding plate 21 has a lower glass lO
In the vicinity of the transport direction, a pair of transport rollers 25 or a pair of transport blocks 26, which are transport members according to the present invention, can be selectively attached and detached by a magnet 29 depending on the type of film l used. Further, as shown in FIG. 3, the lower glass 1G is attached in a floating state on a pair of leaf springs 27 attached to the lower glass holding plate 21, so that it can be fitted even if the upper glass 9 is slightly tilted. ing. When the pair of conveying rollers 25 is used as a conveying member, the upper surface of the lower glass 10 is at the same height as the upper end of the pair of conveying rollers 25 when not pressed, and when the pair of conveying rollers 25 is pressed, Use a material that has an elastic force that is approximately 0.5 mm lower than the upper end of the material. On the other hand, when the transport block pair 26 is used as the transport member, the upper surface of the lower glass lO is approximately 0.5 m higher than the upper end of the transport bronch pair 26 when not crimped, and the upper end of the transport block pair 26 when crimped. will be the same height as. Here, in order to prevent the encoder roller 7 and the glass l from coming into contact with the upper glass plate ≠ 9 when not pressed, the encoder roller 7 and the glass plate 1 should be placed approximately 0.0 mm lower than the lower surface of the upper glass plate 9. The film 1 is attached at such a position that it is transported under the Smm, so that the film 1 does not come into contact with the upper glass even if it is transported in a non-pressure state.

The above is the overall configuration of the roll film carrier and the configuration of the crimping part. Next, the operation and the like will be explained first, first for the entire roll film carrier, and then for the crimping section.

When the roll film cartridge is inserted into the roll film carrier from an opening (not shown), loading is detected by a micro S field (not shown), and film loading is started. At this time, the pressure-bonding glass pair 9 and 10 are controlled to remain open until the end of film loading, so that film loading is not hindered. After film loading is completed, it is determined whether a manual search for the film is necessary. If necessary, manual search is available.
If not, a controller search is performed. In the case of manual search, the conveyance speed is adjusted by a manual search knob (not shown), and when searching while viewing the projected film image, the conveyance speed that can be visually observed is, for example, 30 mm/s.

The conveyance speed is set to 30 mm/s by a CPU (not shown).
If it is determined that: If the conveyance speed is determined to be 30 mm/s or more, the bonded glass pair 9. IO is controlled open.

On the other hand, in the controller search, a CPU (not shown) determines how many frames are apart between the currently projected frame and the search target frame. - As an example, if the number of separated frames is 70 or more frames, the high-speed conveyance range is set, 6 to 69 frames are the medium-speed conveyance range, and 5 frames or less is the low-speed conveyance range.

In the case of high-speed and medium-speed transport ranges, the film is transported with the pressure glass pair 9.10 open, and when the film is to be transported in the low-speed transport range, the pressure glass pair 9.10 is closed.

After completing the above series of film viewing and searching operations,
A rewind is performed. Rewinding is performed by turning on a rewind SW (not shown). When the rewind SW is turned on, the bonded glass pair 9. IO is opened and the supply reel 2 is controlled to reverse. CPU not shown
When it is determined that the winding of the film has been completed by t;, the crushed glass pair 9. The IO is closed and the rewind ends.

Next, the operation of the crimping section will be explained. First, a case will be described in which a double film is used as the film 1 in a reader printer that has an even number of mirrors and is equipped with a prism for image rotation.

FIG. 3 is a schematic diagram of the vicinity of the crimping part where the film 1 is not pinched, and FIG. 4 is a schematic diagram of the vicinity of the crimping part with the film 1 being pinched. be. As shown in Figure 3, a pair of crimped glasses 9, 1
When the film 1 is not compressed, the film 1 is stretched between the encoder roller 7 and the guide roller 11, and does not come into contact with either the upper or lower glass and is transported without any trouble. As shown in FIG. 4, when the glass pair 9 and 10 are pressed together, the pair of conveying rollers 25 is used as a conveying member, so that the film 1 is pressed against the upper glass 9. In this case, the Mylar 24 provided on the lower glass 10 allows the upper glass 9 and the lower glass 1G to
Since there is a gap between them, since the film 1 is pressed against the upper glass 9, the emulsion side of the film 1 (in this case, facing the lower glass 10) is
It does not touch 0. Therefore, even if the film 1 is conveyed at a low speed or an extremely low speed in this state, the film 1 will not be attracted to the lower glass 10 and the conveyance will stop.

On the other hand, when a film obtained by further duplicating a master film or a dupe film is used as the film 1 in the above reader printer, the emulsion side of the film 1 becomes the front surface. First, the pair of conveyor rollers 25 shown in FIG. 1 is removed, and a pair of conveyor block locks 26 is attached in its place. By doing so, the emulsion side (front side) of the film 1 does not come into contact with the upper glass 9, and the back side touches the lower glass 10, so that conveyance does not stop as in the previous case (see FIG. 5).

Next, a case will be described in which a duplex film is used as the film l in a reader printer that has an odd number of mirrors and is equipped with a prism for image rotation. screen 1
In order to project a normal image on 7, the transport structure of the roll film carrier used in reader printers with an even number of mirrors is reversed so that the back side of the film, that is, the emulsion side, is on the upper side. A roll film carrier must be used. In that case, contrary to the case where the mirror configuration is an even number, the conveying member has a pair of conveying blocks.
use. On the other hand, when a film obtained by further duplicating a master film and a duplex film is used as the film 1, a pair of transport rollers 25 is used.

(Other Examples) The two types of conveyance guide members (a pair of conveyance rollers and a pair of conveyance blocks) near the pressure bonding part as in the above embodiment are not selectively exchangeable using magnets, but the type of film used, etc. When the transport roller pair is used, the transport block pair is retracted, and conversely, when the transport block pair is used, the transport roller pair is retracted. It may also be configured such that it switches to the retracted position. Alternatively, the lower glass and the conveying block pair may be integrally provided, and the conveying roller pair may be selectively attached or detached depending on the type of film used. Furthermore, a conveyance guide roller is provided separately from the lower glass holding plate, and is moved up and down by a separate drive from the lower glass holding plate, so that the conveyance guide roller is lowered when the emulsion side of the film is facing upward. and
The film may be moved upward only when the emulsion surface is facing downward to press the film against the upper glass.

Alternatively, instead of using a special conveyance guide member to raise and lower the film conveyance surface, the film conveyance surface may be raised and lowered by raising and lowering an encoder roller and a guide roller. Each of the configurations described above also provides the same effects as those of the embodiments described above. That is, in a roll film carrier used in an image projection device, even if a film that has been insufficiently dried is transported at low or very low speed with the bonded glass pair closed, the film transport surface position switching mechanism Since the film is pressed against the pressure bonding glass I on the non-emulsion surface side, there is no possibility that the emulsion surface of the film will stick to the pressure bonding glass and the conveyance will stop. In addition, in each of the above examples, the explanation was given on the structure of the pressure-bonded glass pair in which the upper glass is fixed and the lower glass is movable, following the example of a narrow roll film carrier, but the upper glass is movable and the lower glass is fixed. It may be in the form of

(Effect of the invention) In a roll film carrier used in an image projection device, the film transport surface position switching mechanism changes the position of the microfilm transport surface according to the type of microfilm used, the mirror configuration of the image projection device, etc. The non-emulsion side of the microfilm is pressed against the pressure glass by manual operation by the user or automatically as appropriate.

This solves the problem that even if the microfilm is conveyed at a low or very low speed with the pair of pressure-bonded glasses closed, the emulsion surface of the microfilm is adsorbed to the pressure-bonded glass and the transportation stops.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the vicinity of the press-bonded glass pair according to the present invention, Fig. 2 is a schematic configuration diagram of a roll film carrier incorporated in a reader printer, and Fig. 3 is a microfilm sandwiched between the press-bonded glass pair. Fig. 4 is a schematic diagram of the vicinity of the pressure-bonded glass pair with the bond released, and Figure 4 is a schematic diagram of the vicinity of the pressure-bonded glass pair using a pair of conveyor rollers, with the microfilm sandwiched between the pressure-bonded glass pair. , FIG. 5 is a schematic diagram of the vicinity of a pressure-bonded glass pair using a pair of transport blocks, with a microfilm sandwiched between the pressure-bonded glass pair. 1...Micro film, 9...Bottom pressure bonded glass. DESCRIPTION OF SYMBOLS 10... Lower pressure bonding glass, 13... Light source, eye... Mirror 15... Condenser lens group, 16... Projection lens. 17. Screen, P...Crimping part, S...Image projection optical path. 24... Mylar, 25... Conveyance roller pair. 26... Conveyance block pair. 27... Leaf spring. 29...Magnet

Claims (1)

[Scope of Claims] A roll film carrier used in an image projection device for projecting an image of a microfilm, comprising: a pair of pressure-bonded glasses, one of which is movable by pressure-bonding with respect to the other; a gap material for securing a gap between the pair of pressure-bonded glasses that is larger than the thickness; and a gap material disposed near the pair of pressure-bonded glasses for changing the position of the conveying surface of the microfilm so that the non-emulsion surface of the microfilm is A roll film carrier comprising: a film conveyance surface position switching mechanism that can be switched so that the side contacts one of the crimp glasses of a pair of crimp glasses;