JPH0588276A - Negative film holding member and film projecting device - Google Patents

Abstract

PURPOSE:To prevent an index member from damaging a negative film at the time of abutting in a film projecting device where the film is prevented from being set wrong in a negative film holding member even when the film is warped and which is provided with a mechanism for advancing the index member for focusing. CONSTITUTION:In the case of placing the negative film F which is recessed in the center part on the lower holding plate 14 of the negative film holding member 5 and loading it, the float of the edge of the film is regulated by the overhanging part 14 of a short guide 14c, so that the film is correctly set at the time of closing an upper holding plate 13. When the index film stuck to the holder is allowed to abut on the film F held by the member 5 by an adjusting button in a state where the member 5 is loaded in the film projecting device and focusing is performed, the projecting part of the adjusting button is engaged with the notch of the member 5 so that the member 5 is fixed and prevented from moving.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film projection device for projecting a film image onto an image reading device and a negative film holding member for the film projection device.

[0002]

2. Description of the Related Art A conventional film projection apparatus is shown in FIGS.
There is something like 0. That is, in the film projection device 12, the light emitted from the projection light source 2 illuminates the film F in the film holding member 5 through the condenser lenses 3 and 4 together with the light reflected by the reflecting mirror 1, and the illuminated film F The light image is projected onto a document table glass 9 of the image reading device via a projection lens 6 and a Fresnel lens 8 held by a lens barrel 7. At this time, the user of the apparatus turns the lens barrel 7 through the intermediate gear 10 by turning the focus adjusting knob 11 while visually observing the projected image, thereby obtaining a predetermined focus state. Then, the negative film holding member 5
11, the upper holding plate 13 and the lower holding plate 14 are made of plate materials, and each hinge portion 13
a and 14a are rotatably attached by a hinge shaft 15, and the upper and lower holding plates sandwich the negative film original F, and the negative film original F has a longitudinal direction of the lower holding plate 14. By abutting against the longitudinal guide 14d, the lateral direction thereof is respectively positioned by the lateral guides 14b and 14c provided facing the lower holding plate 14, and the upper holding plate 13 is provided with the respective guides 14b.
escape holes 13b, 13c, 13 for receiving b, 14c, 14d
d is open. Therefore, the negative film holding member 5
The user first opens the upper holding plate 13 by rotating the upper holding plate 13 about the hinge shaft 15 and abuts one end of the negative film original F in the longitudinal direction against the longitudinal guide 14d of the lower holding plate 14 while facing it. The negative film document F is set between the short guides 14b and 14c, and then the upper holding plate 1
3 is rotated about the hinge shaft 15, the upper holding plate 13 is closed, and the work of setting the negative film original F is completed.

Next, regarding the film projection apparatus, there is a means as shown in FIG. 13 as a means for easily and surely obtaining the focused state at the time of the focus adjustment work. this is,
The projection index 20 is superimposed on the projection image on the Fresnel lens 8. The details of this means will be described with reference to FIG. 13. An index film 21 having indexes 20a, 20b and 20c as shown in FIGS. 14 to 16 is attached to a holder 22.
Is U-shaped at the tip of a rotating lever 25 that supports a rotating shaft 25a on the machine body while engaging the shaft 22a with an elongated hole 24 provided on the machine body while being vertically supported by a support protrusion 23 of the machine body. It is held by the portion 25b. The tip 22b and the index film 21 of the holder 22 in the state of the two-dot chain line in the figure are retracted outside the projection optical path region shown by the two-dot chain line in the figure. When the user of the apparatus presses the tip portion 26a of the adjustment button 26 during the focus adjustment work, the shaft portion 26b of the adjustment button 26 and the elongated hole 25c of the rotary lever 25 are engaged, so The moving lever 25 rotates counterclockwise in the figure, and the holder 22 moves the U-shaped portion 2 of the rotating lever 25.
When the shaft 22a is pushed by 5b, its tip 22b
The lower surface is moved in the direction of arrow a while rubbing against the support protrusion 23. Further, when the holder 22 advances in the direction a, the lower protrusion 22c of the holder 22 abuts on the support protrusion 23. By the way, since one end 24a of the elongated hole 24 of the machine body is formed wider than the other portion, the shaft 22a of the holder 22 is separated from the contact state with the U-shaped portion 25b of the rotating lever 25, and the holder 22 is The index film 21 is rotated in the clockwise direction in the figure by the weight of the support projections 23 as a fulcrum until the index film 21 comes into contact with the film F, resulting in a solid line state in the figure.
Therefore, the index film 21 comes into contact with the film F from almost vertically above the film F, so that rubbing between the index film 21 and the film F at the time of contact can be prevented.

In this state, the user of the apparatus judges the focused state by looking at the projection index having a clear contrast, instead of judging the focused state by the actual projected image,
Adjust the focus. When the focus adjustment work is completed, the device user pulls back the adjustment button 26 in the left direction in the drawing, whereby the rotating lever 25 is rotated in the clockwise direction in the drawing. Then, first, the U-shaped portion 25b of the rotating lever 25 comes into contact with the shaft 22a of the holder 22, and when the rotating lever 25 further rotates, the holder 22 is counterclockwise in the drawing so as to be triggered with the support protrusion 23 as a fulcrum. Rotate in the direction. As a result, the index film 21 moves vertically above the film F, so that rubbing between the index film 21 and the film F can be prevented. When the rotating lever 25 further rotates clockwise in the drawing, the holder 22 moves in the direction of the arrow b in the drawing and enters the state shown by the chain double-dashed line in the drawing. As previously mentioned,
In this state, the tip 22b of the holder 22 and the index film 21 are retracted outside the projection optical path region shown by the chain double-dashed line in the figure, so that the actual film projection image reading operation is possible.

[0005]

However, depending on the state of the negative film original, the negative film holding member of the above-mentioned conventional example does not work well in the lateral direction, and the negative film original is displaced in the film holding member 5. The negative film original is deformed in the worst case. That is, as shown in FIG. 12, when the negative film original F is warped in a concave shape and the warp amount S is larger than the height h of the short guide 14c of the lower holding plate 14, the negative film original F is shown in the figure. As shown in the drawing, there is a case where the short guide 14c is set over the case, and in this state, when the upper holding plate 13 is rotated around the hinge shaft 15 to be closed, the negative film original F is set in a displaced state. However, in the worst case, the negative film original F is deformed. Such a case does not occur if the state of the negative film original F is flat or in the state of being convex inward as opposed to FIG. 12, but the negative film original F
Is composed of a transparent polyester film coated with emulsion, and due to the difference in the expansion coefficient of the two substances due to the ambient temperature and humidity, it becomes a so-called bimetal, so the warpage direction can occur in any direction. As described above, the concave state occurs as described above, resulting in defective setting of the negative film original and deformation of the film.

On the other hand, in the above-described conventional film projection apparatus, if the user moves the film holding member 5 with the index film 21 and the film original F in contact with each other, the index film 21 and the film original F will be moved. Rub against each other,
There is a drawback that scratches are generated on both sides, and good image quality cannot be maintained, and when the film holding member 5 is forcibly moved, the index film 21 and the holder 22 are finally damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the above-described conventional negative film holding member and to provide a film holding member which does not cause a defective setting or deformation of a film original. Further, the present invention provides a film projection device which eliminates the above-mentioned drawbacks of the conventional film projection device and prevents the index member and the film original from being abraded even when they are in contact with each other during focusing. The purpose is to provide.

[0008]

In order to achieve the above object, the present invention is detachable from a film projection device,
In the negative film holding member for positioning the negative film in the lateral direction by a pair of opposed positioning guide portions provided on one plate member and sandwiching the negative film document with the other plate member, the pair of opposed negative film holding members are opposed to each other. At least one side of the positioning guide portion is provided with a floating regulation means for a certain amount or more of the negative film original from the plate material. Further, in order to achieve the above-mentioned object, the present invention is a film projection apparatus having a film holding member, a focus adjusting mechanism, and a mechanism for advancing the focusing index member into the projection optical path while abutting against the film original. In the above, there is provided means for engaging and fixing the film holding member when the index member has entered the projection optical path. Further, there may be provided means for preventing the index member from entering the projection optical path when the film holding member is not in the film projection position.

[0009]

With the above-described negative film holding member, one side edge of the negative film original becomes higher than the height of the positioning guide portion in the lateral direction when a negative film original having a concave curvature is mounted. Since it can be suppressed by the floating control means, the negative film original can be reliably positioned in the lateral direction. In the film projection apparatus having the above structure, the film holding member cannot be moved unless the index member is retracted from the projection optical path by providing the film holding member with the engaging and fixing means. No scratches caused by rubbing against. When the film holding member is not in the film projection position, the means for preventing the index member from entering the projection optical path can prevent contact between the index member and the film holding member.

[0010]

The first embodiment of the negative film holding member of the present invention will be described below.
An embodiment will be described with reference to FIG. FIG. 1 is a sectional view of an essential part, and 13 to 15 are the same as FIG. Then, the hook portion 1 provided on one end surface of the upper holding plate 13
The upper support plate 13 and the lower support plate 14 are hinged by the open spring 16 wound around the hinge shaft 15 by hooking one end on the 3e and the other end on the hooking part 14e provided on the one end surface of the lower holding plate 14. It is biased in the opening direction about the shaft 15, and the maximum opening angle θ at this time is that the rotation stopper 17 is integrally provided on the hinge shaft 15 side of the lower holding plate 14 so that the movement amount of the upper support plate 13 can be controlled. By restricting, the height a of the short guide 14c near the hinge shaft 15 on the lower surface side (inner surface side) of the upper support plate 13 is set so as not to exceed the height h of the short guide 14c. Other configurations are the same as those in FIG. In the present embodiment having the above-described structure, the user slides the negative film original F from the left side in the drawing and sets it in the illustrated state. At this time, by tilting the entire negative film holding member downward to the right in the drawing, the negative film original F is surely abutted against the short guide 14c due to its own weight. At this time, since the right end of the negative film original F is regulated in the upward direction by the lower surface side of the upper holding plate 13, even the negative film original F having the concave shape as shown in the drawing is guided by the short guide 1.
Positioning in the lateral direction is ensured without overcoming 4c. The user rotates the upper holding plate 13 counterclockwise in the drawing to close it while holding the entire negative film holding member in the state of lowering to the right in the drawing, and locks it by a mechanism (not shown). The setting work of is completed.

2 and 3 show a second embodiment of the negative film holding member of the present invention. In this embodiment, the upper holding plate 13 is completely opened with respect to the lower holding plate 14 in order to improve the setting property of the negative film original as in the conventional example shown in FIG. The lower holding plate 14 is used as an upper regulating portion on the right side of the document F in the drawing.
The short guide 14c is provided with a projecting portion 14f at the tip thereof. Other configurations are the same as those in FIG.
In the present embodiment having the above-described structure, as shown in FIG. 2, the user first turns the upper support plate 13 clockwise about the hinge shaft 15 to bring it into a completely opened state. Then, the negative film document F is slid from the upper left side in the drawing, and the edge of the negative film document F is set in a state of being engaged with the projecting portion 14f of the short guide 14c as shown in the figure. At this time, unlike the above-described first embodiment, the upper support plate 13 is in the completely open state, so that the amount of slipping of the negative film original F can be reduced, and the settability thereof is significantly improved. As in the case of the first embodiment, the negative film holding member is entirely tilted downward in the drawing so that the negative film original F can surely hit the short guide 14c by its own weight. Here, when the user rotates the upper holding plate 13 counterclockwise in the drawing, the lower surface of the upper holding plate 13 sequentially contacts the negative film original F as shown in FIG. It is set to correct the warp.

FIG. 4 shows a third embodiment of the negative film holding member of the present invention. In this embodiment, instead of the short guide 14c with the projecting portion 14f of the lower holding plate 14 in the second embodiment, the short guide 14 of the lower holding plate 14 is used.
Separately from c, a projecting member 18 in which a shaft 18a is rotatably engaged with a hole 14g provided in an end surface of the lower holding plate 14 is provided adjacent to the short guide 14c. The other structure is similar to that of the second embodiment. In the present embodiment having the above-mentioned configuration, when setting a negative film original F in a concave state as shown in the drawing, the projecting member 18 is set to the solid line position and the procedure is exactly the same as in the second embodiment. When setting the negative film original F in a flat or medium convex state, by rotating the projecting member 18 clockwise in the drawing to the position of the broken line, the film can be set from vertically above.

In each of the above embodiments, the negative film original F is attached to the short guide 14c near the hinge shaft 15.
Although a floating regulation means of a certain amount or more is provided, such a floating regulation means has a short guide 14 on the side far from the hinge shaft 15.
b, or both short guides 14b, 1
Float control means may be provided on each of the 4c. However,
If it is provided on both sides, the negative film document will be set in the lower holding plate by bending the negative film document in the concave direction in the setting path of the negative film document.
Although the operability is slightly deteriorated, the floating regulation of the negative film original can be more surely performed.

Next, a first embodiment of the film projection apparatus of the present invention will be described with reference to FIGS. FIG. 5 is a longitudinal sectional view of an essential part of this embodiment, and FIG. 6 is a transverse sectional view of the essential part thereof. 4 to 7 and 21 to 26b are the same as those of FIG. Further, 26c is a projection provided on the front surface of the adjustment button 26 (on the side opposite to the tip end 26a), and 5a is an outer edge portion facing the projection 26c of the film holding member 5, and is a projection at a projection setting position for each film image. The notch 5b which can be engaged with 26c is formed. Reference numeral 27 denotes a machine body guide that guides the tip portion 26a of the adjustment button 26. Other configurations are the same as those in FIGS. 9, 10 and 13 described above. In the present embodiment having the above-described configuration, when the user of the apparatus pushes the tip portion 26a of the adjustment button 26 slidably engaged with the machine body guide 27 in the case of the focus adjustment work, the holder is similar to the above-described conventional example. 22 advances in the direction of arrow a, and the index film 21
Contacts the film F. At the same time, the adjustment button 26
The projecting portion 26c engages with the notch 5b of the film holding member 5 and fixes the film holding member 5 as shown in FIG. In this state, the film holding member 5 cannot be moved by the engagement between the protrusion 26c of the adjustment button 26 and the notch 5b of the film holding member 5. When the focus adjustment work is completed and the user of the apparatus pulls back the adjustment button 26 to the left in the drawing, the protrusion 26c and the notch 5 of the film holding member 5 are formed.
The engagement with b is lost, and the film holding member 5 becomes movable.

Next, in the case where the film holding member 5 is not at the film projection position, if the film holding member 5 is not at the film projection position in FIG.
Even if 6 is pushed in, the protrusion 26c of the adjustment button 26 abuts the outer edge portion 5a of the film holding member 5, and the adjustment button 26 cannot move any further. Therefore, the holder 22 to which the index film 21 is attached stops in the state before the solid line state shown in FIG. As a result, even if the operation user pushes the adjustment button 26 in a state where the film holding member 5 is not in the film projection position, the index film 21,
It is possible to prevent the holder 22 from contacting the film F or the film holding member 5.

7 and 8 show a second embodiment of the film projection apparatus of the present invention. The adjustment button is the first
The push type is used in the embodiment, but the slide type is used in the present embodiment. That is, the adjustment button 31 slidable on a machine body (not shown) is provided with a knob portion 31a on the front side thereof, and a shaft portion 31b and an overhanging portion 31c on the rear surface side thereof, and the shaft portion 31b is provided with the rotation lever 25. Engaged with the long hole 25c. A locking lever 32 rotatably supported by a shaft 32c is provided between the adjustment button 31 and the film holding member 5, and the locking lever 32 is provided on one side thereof with an outer edge of the projecting portion 31c. The abutting shaft portion 32a has the film holding member 5 on the other side.
The protrusions 32b that can be engaged with and disengaged from the notches 5b are provided respectively. The other structure is similar to that of the first embodiment.

In this embodiment having the above-described structure, when the user of the apparatus enters the focus adjustment work and slides the knob portion 31a of the adjustment button 31 in the state shown by the two-dot chain line in FIG. The shaft portion 31b also advances in the direction of arrow c, and the turning lever 25 turns clockwise in the drawing. Then, the holder 22 becomes the U-shaped portion 25 of the turning lever 25.
When the shaft 22a is pushed by b, it moves in the direction of the arrow c in the figure while rubbing the lower surface of the tip 22b of the shaft 22a against the support projection 23. Furthermore, when the holder 22 advances in the direction c,
The lower protrusion 22c of the holder 22 abuts on the support protrusion 23. Here, since one end 24a of the elongated hole 24 of the machine body is formed wider than other portions, the shaft 22 of the holder 22 is
a is separated from the contact state with the U-shaped portion 25b of the rotation lever 25, and the holder 22 rotates counterclockwise in the figure until the index film 21 contacts the film F with the support projection 23 as a fulcrum by its own weight. Then, the state becomes a solid line in the figure. Therefore, since the index film 21 comes into contact with the film F from almost vertically above the film F, the index film 2 at the time of contact is formed.
1 and the film F can be prevented from rubbing against each other.

On the other hand, as shown in FIG. 8, when the adjustment button 31 is slid in the direction of the arrow c in the figure as described above, the locking lever 32 is pushed by the overhanging portion 31c of the adjustment button 31 to push the shaft portion 32a. Rotate in the direction of the middle arrow e,
The protrusion 32b is engaged with the notch 5b of the film holding member 5, and finally the solid line state is reached. In this state, the film holding member 5 cannot be moved by the engagement between the protrusion 32b of the locking lever 32 and the notch 5b of the film holding member 5. When the focus adjustment work is completed and the user of the apparatus moves the adjustment button 31 in the direction of arrow d in the drawing to return to the state of the chain double-dashed line in the drawing, the locking lever 32 is moved in the direction of arrow f in the drawing by a mechanism not shown. The adjustment button 3
With the movement of No. 1, it rotates in the f direction in the figure, and the protrusion 32b
The engaging relationship with the notch 5b of the film holding member 5 disappears, and the film holding member 5 becomes movable.

Next, in the case where the film holding member 5 is not in the film projection position in FIG. 8, if the film holding member 5 is not in the film projection position, even if the apparatus user slides the adjustment button 31 in the c direction, The protrusion 3 of the locking lever 32 rotated in the direction of arrow e with the sliding operation.
2b hits the outer edge portion 5a of the film holding member 5,
The adjustment button 31 cannot move any further. Therefore, the holder 22 to which the index film 21 is attached stops in the state before the solid line state shown in FIG. As a result, even if the user of the apparatus slides the adjustment button 31 in the direction c while the film holding member 5 is not in the film projection position, the index film 21 and the holder 22 may contact the film F or the film holding member 5. Can be prevented.

[0020]

As described above, the negative film holding member of the present invention is provided with at least one side of the pair of opposing short-side positioning guide portions, and a predetermined amount or more of floating control means from the plate material. By providing the negative film originals in the lateral direction, even if the negative film originals are concave, it is possible to prevent the occurrence of misalignment due to overcoming the positioning guide and the deformation of the negative film originals. There is an effect that a good image can be obtained by performing directional positioning. Further, compared with the case where the height of the guide portion is increased to improve the certainty of positioning of the negative film original in the lateral direction, a larger space around the negative film original can be secured, so that the negative film caused by the heat generated by the light source for illumination is used. This has the effect of suppressing heat damage, such as heat deformation due to a rise in the temperature of the document.

Next, the film projection apparatus of the present invention has a mechanism for advancing the film holding member, the focus adjusting mechanism, and the focusing index member into the projection optical path in the state of being brought into contact with the film original as described above. In the film projection apparatus having the above, by providing means for engaging and fixing the film holding member when the index member has entered the projection optical path, the film holding member is fixed when the index member and the film document are in contact with each other. It is possible to prevent the both from being scratched by being moved, maintain good image quality, and prevent damage to the index member itself. Further, when the film holding member is not in the film projection position, by providing a means for preventing the index member from entering the projection optical path, the apparatus user can start the focus adjustment operation without the film holding member in the film projection state. The index member and its holding member and the film and its holding member are prevented from coming into contact with each other even when the index member is extended into the projection optical path, the index member and its holding member are prevented from being damaged, and scratches or the like occur on the film. Can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a negative film holding member according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a negative film holding member according to a second embodiment of the present invention in an open state.

FIG. 3 is a sectional view of the same in a closed state.

FIG. 4 is a sectional view of a negative film holding member according to a third embodiment of the present invention.

FIG. 5 is a sectional view of the essential parts of a first embodiment of the film projection apparatus according to the present invention.

FIG. 6 is a top view of the fixing mechanism of the film holding member.

FIG. 7 is a cross-sectional view of essential parts of a film projection apparatus according to a second embodiment of the present invention.

FIG. 8 is a top view of the fixing mechanism of the film holding member.

FIG. 9 is a schematic sectional view of a conventional film projection device.

FIG. 10 is a perspective view of the same.

FIG. 11 is a top view of a negative film holding member of a conventional example.

FIG. 12 is a sectional view thereof.

FIG. 13 is a cross-sectional view of essential parts of a conventional film projection device.

FIG. 14 is an example of an index of an index member.

FIG. 15 is also an example of another index.

FIG. 16 is another example of another index.

[Explanation of symbols]

F ・ ・ Negative film, 5 ・ ・ Film holding member, 5a ・
..Outer edge portion, 5b..notch, 11 ... focus adjustment knob, 12 ... film projection device, 13 ... upper holding plate, 1
4 ... Lower holding plate, 14b, 14c ... Short guide, 14
f ... Overhanging part, 15 ... Hinge shaft, 17 ... Rotation stopper, 18 ... Overhanging member, 20 ... Index, 21
..Index films, 22..Holders, 25..Rotating levers, 26,31..Adjustment buttons, 26c..Projections,
31c ... Overhanging part, 32 ... Locking lever

Claims (3)

[Claims] 1. A detachable film projection device, comprising:
In the negative film holding member for positioning the negative film in the lateral direction by a pair of opposed positioning guide portions provided on one plate member and sandwiching the negative film document with the other plate member, the pair of opposed negative film holding members are opposed to each other. The negative film holding member, characterized in that at least one side of the positioning guide portion is provided with a floating film regulating means for a certain amount or more of the negative film original from the plate material. 2. A film projection apparatus having a film holding member, a focus adjusting mechanism, and a mechanism for advancing a focusing index member into the projection optical path while abutting against the film original, wherein the index member is in the projection optical path. A film projecting device comprising means for engaging and fixing a film holding member when the film projecting apparatus is in the state of entering. 3. The film projection apparatus according to claim 2, further comprising means for preventing the index member from entering the projection optical path when the film holding member is not in the film projection position.