JPH061337B2 - Film projection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the invention [Industrial field of application] The present invention relates to a film projection apparatus, and more specifically, to a film holding apparatus for locating a required film frame image on an illumination unit and Detachable film holding assembly,
A projection lens including a projection lens and a focus adjustment mechanism, which is opposed to the film holding assembly with a common projection optical axis, and projects a frame image positioned in the illumination section by the film holding assembly onto a projection target member. A film projection apparatus having an assembly.

[Conventional technology]

A micro film reader or a reader printer is a typical representative of the above film projection device. Hereinafter, a microfilm reader printer will be described as an example.

FIG. 6 shows a very schematic structure of an example of a microfilm reader printer. Reference numeral 1 denotes an exterior casing of the apparatus main body (printer main body), in which a photographing mechanism is incorporated in a substantially lower half portion of the outer casing, and a substantially upper half portion is a dark box portion, and a lower half portion and an upper half portion thereof. When viewed from the front side of the exterior casing, the space is largely retracted into the exterior casing to form a deep space 2, and the space serves as an arrangement portion for the film holding assembly 5 and the projection lens assembly 6. The film holding assembly 5 and the projection lens assembly 6 are arranged opposite to each other on the upper surface side of the floor plate 3 and the lower surface side of the ceiling plate 4 in the above-mentioned assembly disposition space 2 with their projection optical axes in common. 7
Is a film illuminating section including an illuminating lamp 7a, a condenser lens 7b, etc., and has a projection optical axis common to both of the assemblies 5 and 6 on the side opposite to the projection lens assembly 6 with the film holding assembly 5 in the middle. And is arranged upward. F indicates a portion of the microfilm held by the film holding assembly 5.

Thus, the lighting unit 7 is held by the film holding assembly 5.
The required film frame image Fa searched for the position is illuminated by the illumination unit 7, the film frame image transmitted light of the illumination light enters the projection lens assembly 6, and the fixed first mirror 8 in the dark box portion example → solid line An enlarged projection image is formed on the back surface of the screen 11 provided on the front side of the dark box through the path of the movable second mirror 9 → the fixed third mirror 10 in the tilted posture shown in FIG. The enlarged projection image of the film frame image Fa is read from the outer surface side of the screen 11.

To obtain an enlarged copy (enlarged copy) of the frame image Fa, a copy button (not shown) is pressed. Then, the movable second mirror 9 jumps up as shown by the two-dot chain line and is held at that position, and the scanning mirror box 12 once moves upward from the standby position shown by the solid line to the position shown by the two-dot chain line (forward movement a). )
To be done. The drive system and movement guide member of the scanning mirror box are omitted in the figure.

Further, the photosensitive drum 14 of the copying mechanism built in the lower half of the outer casing of the apparatus is rotationally driven in the direction of the arrow at a predetermined peripheral speed. The scanning mirror box 12 that has moved up to the position indicated by the chain double-dashed line is moved back to the first standby position b at a high speed in synchronization with the rotation of the photosensitive drum 14. As a result, a magnified image of the required film frame image Fa located on the illumination unit 7 is projected lens assembly 6 → fixed first mirror 8 → first mirror 12a of scanning mirror box 12 → second mirror 12 thereof.
The surface of the rotary photosensitive drum 14 is slit-exposed by the optical system of b → slit 13. Then, a toner image of an enlarged image corresponding to the slit exposure image, that is, the film frame image Fa is formed on the peripheral surface of the photosensitive drum by an image forming device (not shown) arranged around the drum, and the toner image is supplied. The copy paper is sequentially transferred onto the surface of the copy paper P fed from the paper portion 16 to the transfer portion 15 of the rotary photosensitive drum 14, and the copy paper passes through the fixing device 17 and is output as an enlarged copy of the required film frame image Fa as a discharge tray. It is discharged to 18. Reference numeral 16a denotes a copy paper cassette in which copying materials are stacked and stored, and can be freely taken in and out of the paper feeding unit 16 as indicated by an arrow. Reference numeral 16b indicates a sheet feeding roller, 16c indicates a deflection guide for the fed copy material, and 16d indicates a conveyance path of the copy material.

There are two types of film holding assemblies 5, a so-called roll film carrier when handling a roll film and a so-called fish film carrier when handling a fish film (including a strip film).

The roll film carrier includes a film winding / rewinding reel, a rotation driving mechanism thereof, a fixed / movable film platen mechanism, a film frame mark searching mechanism, and the like.

The fish film carrier includes a fixed / movable film platen mechanism, an X / Y moving mechanism of the platen mechanism, and an index plate setting section.

There are two types of the projection lens assembly 6, that is, a so-called single lens dropping type and a so-called lens turret type.

The single-lens drop-in type is a single lens-barrel that retains the projection-lens-barrel unit with the selected magnification out of several prepared individual enlargement / projection-magnification units, which is a drop-down type that can be inserted / removed and replaced. It includes a holding member and a focus adjusting mechanism for changing the holding position of the holding lens barrel for focusing.

In the lens turret type, a common support is provided with two or more lens barrels having different expansion projection magnifications, and each of these lens barrels is provided with a focus adjusting mechanism,
The lens barrel having a desired magnifying and projecting magnification is switched to the optical axis position of the projection optical system to be used by rotating or moving the support.

In general, the single lens drop-in type is suitable as the projection lens assembly 6 when the film holding assembly 5 is a roll film carrier, and the lens turret type is suitable as the projection lens assembly 6 when the film holding assembly 5 is a fish film carrier. Note that film projection is possible even in the case of a combination opposite to the above.

[Problems to be solved by the invention]

By the way, in the conventional microfilm reader / reader printer, etc., the film holding assembly 5 has the same structure as that of the microfilm used so that the microfilm used can be either roll film or fish film (or stop film). The roll film carrier or the fish film carrier can be detachably and removably attached to the main body of a device such as a reader or a reader / printer according to the above-mentioned configuration.

(1) As for the projection lens assembly 6, however, either the single-lens drop-down type or the lens turret type assembly, which is specified by the manufacturer, is installed and fixed to the main body of the apparatus. Corresponding to the replacement of the roll film carrier or the fish carrier as the holding assembly 5, the projection lens assembly 6 should be replaced with a single lens drop-down type or a lens turret type suitable for the replacement carrier. I couldn't.

(2) Further, as described above, the single lens drop-in type or lens turret type projection lens assembly 6 that is fixedly installed on the apparatus main body side is present so as to projectly face the film holding assembly 5. It becomes an obstacle during the attaching / detaching operation of the roll film carrier or the fish carrier as the film holding assembly 5. Therefore, the attaching / detaching method / structure of the carrier must be devised so as not to interfere with it. The procedure / structure is complicated. In particular, in the case of a roll film carrier, a relatively large film winding / rewinding reel and its rotation driving unit are provided on both sides of the film platen mechanism or the film frame mark search mechanism located in the film illumination unit 7 inside. Therefore, it is necessary to devise and attach it to the main body of the apparatus while avoiding interference with the projection lens assembly 6, and in many cases, the film platen mechanism section at the center is largely rotated and operated. Further, it has been a method of attaching / detaching by including a more complicated procedure, or a method of once disassembling a part of the constituent members and performing an attaching / detaching operation.

An object of the present invention is to solve the above-mentioned problems (1) and (2).

B. Structure of the Invention [Means for Solving the Problems] The present invention is a projection lens assembly of a single lens drop-in type, a lens turret type, etc. in a film projection apparatus such as the above-described micro film reader / reader printer. With respect to the holding, the engaging member provided on the projection lens assembly of the single-lens drop type and the engaging member provided on the projection lens assembly of the lens turret type are selectively engaged to position and hold the projection lens assembly. The gist is that the section is provided in the apparatus main body.

[Work]

That is, according to the present invention, since the projection lens assembly is formed as a unit that can be attached to and detached from a predetermined position of the apparatus main body, the roll film carrier or the fish film carrier as the film holding assembly can be exchanged for the apparatus main body. As for the projection lens assembly, a single lens drop-down type or a lens turret type suitable for the type of carrier to be exchanged can be exchanged and used in combination.

Further, when the film holding assembly is attached to or detached from the main body of the apparatus, the projection lens assembly in the state of the apparatus, which becomes an interference obstacle, can be temporarily removed. Therefore, the structure for attaching and detaching the film holding assembly to the main body of the apparatus is extremely simple. Can be

〔Example〕

1 to 3 show a single-lens drop-down type projection lens assembly, which is a detachable unit body 6 at a predetermined position of the main body of an apparatus such as a microfilm reader / reader printer.
FIG. 1 shows an example configured as A. FIG. 1 is a vertical sectional side view of the lens unit 6A mounted in a predetermined position of the apparatus main body, FIG. 2 is an exploded perspective view of the unit, and FIG. It is the figure which showed the front state or the state removed.

Reference numeral 20 denotes a lens unit attachment / detachment support that is firmly fixed with a screw or the like at a predetermined lens unit mounting position on the device body side (in this example, a predetermined position on the lower surface of the ceiling plate 4 of the device body space 2) with the longitudinal direction being the front-rear direction. It is a rail plate. 21.2
1 is a screw hole, 22 and 22 are rail edges provided along the length of the left and right sides of the plate, and 23 and 23 are mountain cam-shaped click protrusions provided in the middle of the left and right rail sides 22 and 22, respectively. When a pressing force is applied, the joints 23a, 23a resist the elasticity of the joints and sink downward to operate. Reference numeral 24 is a notched concave portion formed at the center of the front end side of the plate, and 25 is a light transmitting window hole formed at the center of the plate surface.

Reference numeral 30 denotes an upper main frame of the lens unit 6A, and the lens unit 6A is attached to and detached from a predetermined position on the device main body side by engagement of the upper main frame and the rail plate 20 provided on the device main body side. Reference numerals 31 and 31 are rail strips provided so as to face each other inward along the upper edge lengths of the left and right frame sides of the main frame, and 32 and 32 are rail strips 31.3 on the left and right sides thereof.
Notch recesses provided in the middle part of 1; 33 is a rear wall plate provided downward on the rear side of the frame; and 34 (34) is a member provided outwardly at the left and right lower edges of the rear wall plate. Compound jaw projection 35 is a convex portion provided inwardly in the central portion on the front side of the frame, 36 (36)
Is a non-slip ridge formed on the front surface of the left and right sides of the frame as the grip portion for holding the lens unit.

The left and right rail strips 3 of the upper main frame 30 on the lens unit 6A side are provided on the tip side of the rail plate 20 on the apparatus main body side.
The rear end side of 1.31 is positioned correspondingly, and the left and right rail edges 22 and 22 of the rail plate 20 side are engaged with the left and right rail strips 31 and 31 of the upper main frame 30 side, respectively. Push in while sliding the frame 30 (arrow c in FIG. 3). The upper main frame 3 during the slide pushing
The rear end of each of the left and right rail strips 31 and 31 on the 0 side abuts on the click protrusions 23 and 23 existing in the middle of the left and right rail edges 22 and 22 on the rail plate 20 side, respectively. When the upper main frame 30 is further pushed in against the abutting resistance, the click protrusions 23, 23 sink downward against the elasticity of the connecting portions 23a, 23a, allowing the subsequent pushing movement of the upper main frame 30. To be done. Then, when the protrusion 35 on the frame front side of the upper main frame 30 is fitted into the notched concave portion 24 on the front end side of the rail plate 20 and is sufficiently pushed in until it abuts, the click protrusion 23. Notch recesses 33, 33 existing in the middle of the rail strips 32, 32 on the frame 30 side
At a corresponding position, the click projections 23, 23 return upward and engage with the recesses 33, 33. As a result, the upper main frame 30, that is, the lens unit 6A is positioned and supported at a predetermined position of the apparatus main body (shown by a chain line in FIGS. 1 and 3).

The lens unit 6A mounted and supported on the apparatus main body side is detached by a notch recess 33 that engages the upper main frame 30 of the lens unit 6A with each other in the direction opposite to the mounting direction (d in FIG. 3). By pulling against the engaging force between 33 and the click projections 23, the click projections 23, 23 sink downward and disengage from the cutout recesses 33, 33, and thereafter the upper main frame 30 The lens unit 6A is smoothly pulled out from the rail plate 20, and the lens unit 6A is easily removed from the device body side (FIG. 3).

In addition, in this embodiment, in order to smoothly insert and remove the upper main frame 30 with respect to the rail plate 20, the rail plate 20
The left and right rail edges 22, 22 are tapered rail edges that are slightly constricted in front of each other. Corresponding to this, the upper main frame 3
The engagement rail strips 31, 31 on the 0 side are also tapered rail strips that are mutually narrowed forward.

Reference numeral 40 is a lower main frame of the lens unit 6A, 41 is a helicoid female tube fitting hole provided in the lower main frame, and 42 is a rear wall plate provided upward on the rear side of the frame. Board 4
The downward rear wall plate 33 of the upper main frame 30 is fitted into the inside of the second main frame 30, and when fully fitted, the engaging claw projections 3 on the upper main frame 30 side.
4 (34) is an engaging hole 43 provided in the lower main frame 30.
The upper and lower main frames 30 and 40 are engaged and integrated with each other by fittingly engaging with 43.

Reference numeral 50 is a helicoid female tube support member, and a pair of L-shaped arms 52, 52 are provided on the left and right portions of a horizontal shaft 51 in the left-right direction. The vertical arms 53, 53 of the left and right L-shaped arms are arm plates having elasticity in the front-rear direction, and the bearing plates 55, 55 are provided at the distal ends of the horizontal arms 54, 54 so as to face each other vertically. There is. Reference numerals 56 and 56 are bearing holes formed in those bearing plates. Also, the portions of the horizontal arms 54, 54 near the horizontal axis 51 are made into bent portions 57, 57 to give the arms vertical elasticity. Further, the horizontal axis portion 51a between the left and right L-shaped arms 52, 52 has an appropriate torsional elasticity.

The above-mentioned helicoid female tube support member 50 includes the left and right end portions 51b and 51b of the horizontal shaft 51 and the left and right L-shaped arms 52 and 52.
The shaft portion 51a between them is fitted into bearing grooves 44b (44b) and 44a provided on the rear frame side of the lower main frame 40 so as to be received, and the lower main frame 40 and the upper main frame 30 are When combined and integrated as described above, the convex portion 37 provided on the lower edge of the rear wall plate 33 on the upper main frame 30 side has the bearing groove 44 of the lower main frame 30.
The shaft 51 is prevented from dancing at a position facing a. The vertical arms 53, 53 of the left and right L-shaped arms 52, 52 are fitted inside the rear wall plate 42 of the lower main frame 40.
0 elastically contacts the inner surface of the rear wall plate 33. The helicoid female cylinder 60 includes the horizontal arms 54.5 of the arms 52.
The lower main frame 40 is supported by bearings between the four bearing plates 55, 55.
Bearing plates 55.5 in the helicoid female cylinder fitting hole 4 of
5 around the shaft pin 61 (61) that is supported by
It is freely swingable and swingable within a range regulated by front and rear guard walls 46a and 46b which are integrated with 0.

Reference numeral 70 is a helicoid male cylinder screwed into the helicoid female cylinder 60 from the upper end side, 71 is a finger projection for turning operation provided on the outer circumference of the male cylinder, and 72 is a turning range regulating stopper piece. When the helicoid male cylinder 70 rotates leftward with respect to the female cylinder 60, the stopper piece 72 abuts against the first receiving portion 45a on the lower main frame 40 side to be received, and rotates rightward. Then, the second receiving portion 45b on the opposite side of the first receiving portion 45a is contacted with the second receiving portion 45b to be received, so that the helicoid male cylinder 70 is located between the first and second receiving portions 45a and 45b. The helicoid female cylinder 60 can be freely rotated within a range of approximately 180 °.

A single lens barrel 80 is used for the helicoid male barrel 70.
Is dropped from the upper end of the male cylinder and set.

The above-mentioned members 30, 40, 50, 60, 70, 80 constitute a projection lens unit body 6A of a single lens drop-in type which is detachable from the apparatus main body.

In the mounted state, the lower surface of the lower end flange 62 of the helicoid female cylinder 60 is on the upper surface of the upper platen glass 100 on the side of the roll film carrier 5A as the film holding assembly as shown in the first illustration, the members 53, 53, 57, 57,
Elasticity of 51a and shaft pin 61 (61) of helicoid female cylinder 60
The helicoid female cylinder 60 is floated by the swinging about the center of the helicoid to be stably elastically held in a stable pressure contact state with a substantially constant pressing force, whereby the optical axis of the lens optical axis is vertically aligned with respect to the film. Reference numeral 101 is a lower platen glass, and the film F is sandwiched between the platen glasses above and below the film F. When the film is running, the lower platen glass 101 goes down, and the pinching of the film is released.

The helicoid male cylinder 70 in which the single lens barrel 80 is dropped and set is rotated leftward or rightward with respect to the female barrel 60 by an appropriate amount to rotate the male barrel 70, that is, the single lens barrel 80.
Moves up and down with respect to the female cylinder 60, and the position of the single lens barrel 80 with respect to the surface of the film F changes to adjust the focus.

FIG. 4 is a perspective view of an example of a lens turret type projection lens assembly which is a detachable unit body 6B with respect to the apparatus main body. In this example, the first and second two lens barrels 91 having different magnifying projection magnifications are used.
・ Two-cylinder switching type equipped with 92.

Reference numeral 93 is an upper board of the unit body 6B, and a rail strip 31 which is engaged with the rail plate 20 on the apparatus main body side is provided on this board, as in the case of the unit body 6A shown in FIGS.
-31, notched concave portions 32, 32, and convex portion 35 are provided, so that the unit body 6B can be easily positioned and attached to a predetermined position of the apparatus body as in the case of the unit body 6A.

FIG. 5 is a view showing a state in which the lens unit body 6B is attached to the apparatus main body. As the film holding assembly, a fish film carrier 5B is attached.
The lens barrel support rotatably supported on the lower surface of the upper substrate 93 by rotating the lens switching lever 94 (FIG. 4) of the mounted projection lens unit 6B to the left or right. The body 98 rotates to rotate the first lens barrel 9
The first or second lens barrel 92 is switchably positioned at the optical axis position of the projection optical system. Focus adjustment is performed by the adjusting ring 9 of the adjusting mechanism provided in each of the first and second lens barrels 91 and 92.
It is performed by rotating 5.96.

Thus, the roll film carrier 5A or the fish film carrier 5B as a film holding assembly.
The projection lens assembly can be used in combination by exchanging the single lens dropping type 6A or the lens turret type 6B for the replacement of the apparatus main body.

Further, when the film holding assemblies 5A and 5B are attached to and detached from the apparatus main body, the projection lens assembly 6A or 6B that is in the mounted state, which becomes an interference obstacle, can be temporarily removed. Therefore, the film holding assemblies 5A and 5B can be attached to and detached from the apparatus main body. The structure and operation can be extremely simple. It is also possible to attach and detach various optional units.

C. Effect of the Invention As described above, according to the present invention, the intended purpose is well achieved, and it is effective and appropriate as an improvement of this type of film projection apparatus.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 is a vertical sectional side view of an example of a unitary single-lens drop-in type projection lens assembly when it is attached to an apparatus main body.
Fig. 3 is an exploded perspective view thereof, Fig. 3 is a state diagram before mounting or after removal, Fig. 4 is a perspective view of an example of a lens turret type projection lens assembly unitized, and Fig. 5 shows it in the main body of the apparatus. FIG. 6 is a schematic diagram of an example of a microfilm reader printer in a mounted state. 5A is a roll microfilm carrier as a film holding assembly, 5B is the same fish film carrier, 6A is a single lens drop-in type unit body as a projection lens assembly, and 6B is the same lens turret type unit body.

Claims (1)

[Claims] 1. A film holding assembly which holds a film, positions a desired film frame image on an illuminating section, and is detachable from an apparatus main body, and a projection optical axis common to the film holding assembly. A film projection apparatus having a projection lens assembly including a projection lens and a focus adjustment mechanism for image-projecting a film frame image positioned on an illuminating unit by a film holding assembly onto a projection target member. The apparatus body is provided with a holding portion for selectively holding one of the engagement member provided on the projection lens assembly and the engagement member provided on the lens turret type projection lens assembly to position and hold the projection lens assembly. A film projection device.