JPS62223744A - Film projecting device - Google Patents

Abstract

PURPOSE:To automatically and vertically extrude the optical axis of a projection lens from a film surface by providing the titled device with a member for always rotating and exciting a pair of arm members to the film holding assembly side to press the film holding member side surface of a lens holder against the surface of an opposite member on the film holding assembly side at prescribed pressure. CONSTITUTION:A lower shaft pin 61b of a helicoid measuring cylinder 60 is inserted into a bearing hole 56 of a bearing plate and the cylinder 60 is used so as to be supported by a supporting member 50 through a bearing. Since the cylinder 60 to be moved to the projection lens assembly 6 side is moved upward as a whole by the distance between the upper and lower axis pins 61a and 61b from a film holding carrier 5, the floating press contact force on the lower surface of a lower flange 62 of the cylinder 60 to the upper surface of a frame retrieving device 102 arranged on a high position level A2 of the film holding carrier 5 side is made proper and the upper and lower shaft pins 61a, 61b can be made to respond to the upper position level change of the film holding carrier 5 side.

Description

[Detailed Description of the Invention] A. Purpose of the Invention [Field of Industrial Application] The present invention is a film projection device, more specifically, a lens holder on the projection lens assembly side is held by a floating mechanism and held by the lens holder. The present invention relates to a film projection device that automatically aligns the optical axis of a projection lens perpendicularly to a holding film surface on a film holding assembly side.

[Conventional technology]

A typical example of the above-mentioned film projection apparatus is a microfilm league or a microfilm league printer. A microfilm league printer will be explained below as an example.

Figure 9 shows an example of a microfilm league printer.
This shows a schematic configuration. 1 is the exterior case of the main body of the device (League Printer main body), and the copying mechanism is built in approximately the lower part of the exterior part, and the road part is a dark box part, and the lower and upper parts of the case are When viewed from the front side of the exterior casing, the space is largely retracted inward to form a deep space 2, which is used as a mounting portion for a film holding assembly 5 and a projection lens assembly 6. The film holding assembly 5 and the projection lens assembly 6 are disposed vertically 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 assembly installation space 2, respectively, with the projection optical axis common to each other. ing.

Reference numeral 7 denotes a film illumination section consisting of an illumination lamp 7a, a condensing lens 7b, etc., and is disposed below the film holding assembly 5 so as to share a projection optical axis with both assemblies 5 and 6, facing upward. F indicates a portion of the microfilm held by the film holding assembly 5.

Thus, it is held by the film holding assembly 5.

The required film frame image Fa searched for the illumination section 7 position
is illuminated by the illumination section 7, and the transmitted light of the film frame image of the illumination light enters the projection lens assembly 6, which moves from the fixed first mirror 8 on the dark box section side to the movable second mirror 8 in the fallen position shown by the solid line. An enlarged projected image is formed on the back surface of the screen 11 provided on the front side of the dark box via the path from the mirror 9 to the fixed third mirror 10. It is viewed and read from the outside.

If the user wishes to obtain an enlarged copy of the frame image Fa, the user presses a copy button (not shown).

That's possible! The second mirror 9 of lJJ springs up as shown by the two-dot chain line and is held in 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). be done. Note that the drive system, movement guide member, etc. of the scanning mirror box are omitted from the drawing.

Further, a photosensitive drum 14 of a copying mechanism built in the lower half of the outer casing of the apparatus is rotated in the direction of the arrow at a predetermined circumferential speed. The scanning mirror box 12, which has been moved upward to the position indicated by the two-dot chain line, is moved backward toward the initial standby position at a speed synchronized with the rotation of the photosensitive drum 14. As a result, an enlarged image of the required film frame image Fa located in the illumination section 7 is transmitted from the projection lens assembly 6 to the fixed first mirror 8 to the first mirror 12a of the scanning mirror box 12 to the second mirror 1.
2b→Slint exposure is performed on the surface of the rotating photosensitive drum 14 by the optical system of the slint 13. Then, an enlarged toner image corresponding to the slit exposure image, that is, the film frame image Fa, is formed on the circumferential surface of the photosensitive drum by an image forming device (not shown) disposed around the drum, and the toner image is The sheets are sequentially transferred onto two sides of the copy paper fed from the paper section 16 to the transfer section 15 of the rotary photosensitive drum 14, and the copy paper passes through the fixing device 17 and is delivered to the paper output tray as an enlarged copy of the required film frame image Fa. 18.

16a is a copy paper cassette loaded with copy materials;
It can be freely taken in and out of the paper feed section 16 as shown by the arrow.

16b is a paper feed roller, 16C is a deflection guide for the fed copy material, and 16d is a conveyance path for the copy material.

There are two types of film holding assembly 5: a so-called roll film carrier for handling roll film, and a so-called fee-2 film carrier for handling fish film (including strip film).

A roll film carrier consists of a film winding/rewinding reel, its rotational drive mechanism, a film holding platen mechanism,
It includes a film frame mark search mechanism, etc.

The fish film carrier includes a film holding platen mechanism, an XφY moving mechanism for the platen mechanism, an index plate setting section, and the like.

There are two types of projection lens assembly 6: a so-called single lens drop-in type and a so-called lens turret type.

The drop-in lens is a lens that holds a single lens barrel of the selected magnification from among several projection lens barrels with different magnification magnifications, allowing it to be inserted and removed freely. holder (lens barrel unit holding member),
It includes a focus adjustment mechanism that changes the holding position of the holding lens barrel for focusing.

The lens turret type has two or more lens regions each having different enlargement magnifications on a common support, and each of the lens barrels is equipped with a focus adjustment mechanism,
This structure is such that a lens barrel having a desired enlargement projection magnification is selectively positioned at the optical axis position of the projection optical system by rotating or moving the support body.

As described above for the projection lens assembly 6, the configuration in which the lens holder is supported by a floating mechanism to automatically align the lens optical axis perpendicularly to the film surface is intended to eliminate one-sided focal failure of the projection lens with respect to the film surface. It is mainly used for drop-in type projection lens assemblies.

Figures 10 and 11 respectively show general configuration examples of such floating mechanisms.

In the case shown in Figure 0, 91 is an immovable vertical and short cylinder that is integrated into the main body frame (not shown) on the side of the projection lens assembly 6, and 92 is a vertically short cylinder that can freely slide up and down and have some play in the front, rear, left and right directions. A lens holder 80 is inserted and arranged to be freely movable and is constantly urged downward by a spring member (not shown), and 80 is a projection lens tQf,')(el'L) inserted and held in the lens holder 92. It is the body.1
00 and 101 are upper and lower film holding platen glasses on the side of the film holding assembly 5, and F is a film sandwiched between the upper and lower platen glasses 100 and 101.

As described above, since the lens holder 92 is floating vertically, longitudinally, horizontally and horizontally within the vertical and short cylinder 91 and is pressed downward, the lower end surface of the lens holder 92 is pressed against the film holding assembly 5. The lens holder 9 is held in a stable sitting state in which it is always pressed against the upper surface of the upper platen glass 100 with a predetermined and constant appropriate pressing force.
The lens optical axis O-0 of the simple projection lens mirror 80 held in the projection lens mirror 2 is automatically brought out perpendicularly to the surface of the holding film on the film holding assembly 5 side, thereby preventing the occurrence of one-sided focal defects. The automatic vertical alignment of the optical axis 0-0 of the projection lens with respect to the film F plane described above is performed when the platen glasses 100 and 101 holding the film F are inclined to a certain degree 1-0 with respect to the horizontal as shown by the two-dot chain line. Even if there is, it will be done accordingly.

In the one shown in Fig. 11, 93 and 93 are two parallel vertical guide shafts integrated into the main body frame on the projection lens assembly side;
Reference numeral 94 denotes a helicoidal female cylinder that is guided to move up and down along its longitudinal guide axis. In this case, the diameters of the fitting holes 94a, 94a on the side of the helicoid female part relative to the vertical guide shafts 93, 93 are made larger than the diameters of the shafts 93, 93, so that the helicoid female tube 94 can also be moved to some extent in the front and rear and left and right directions. Play and move freely. Reference numerals 95 and 95 denote springs that constantly press and bias the helicoid female cylinder 94 downward along the vertical guide shafts 93 and 93. 96 is a male helicoid tube screwed into the female helicoid tube 94, and the female and male helicoid tubes 94 and 96 constitute a lens holder, and the male helicoid tube 96 inserts and holds the projection lens barrel 80. be done.

In this case as well, the lens optical axis 0-O is automatically aligned perpendicularly to the surface of the holding film on the film holding assembly 5 side, as in the case of FIG. 10 of FIG.

A knob 96a (focusing lever) integrated with the helicoid male cylinder 96 allows the male cylinder to be attached to the helicoid male cylinder 9.
When the male barrel 96 and the projection lens barrel 80 inserted and held therein move up and down relative to the female barrel 94, the lens barrel 8 is rotated to the left or right with respect to the film F surface.
The height position of 0 is changed and the focus is adjusted.

[Problem that the invention seeks to solve]

J-Note All conventional lens holder floating mechanisms have a play gap α that allows the lens holder to move back and forth and left and right to a certain extent, so this inevitably causes play in the lens holder. It gives a bad feeling of use. Also, if the film holding assembly is a fish film carrier, when it is used, the optical axis may move unstable due to the rattling of the lens holder, causing the projected image on the screen to be
Just adjust the movement up and down and left and right.

The present invention aims to solve this problem of backlash.

B1 Structure of the Invention [Means for Solving Problems] The present invention includes a pair of substantially parallel arm members that are supported by a fixed member on the projection lens assembly side so as to be able to swing freely about a horizontal axis. By supporting the lens holder between the members so as to be able to freely swing around a horizontal axis whose axis is substantially parallel to the swing center horizontal axis of the arm member, the lens holder is placed on the film holding assembly side facing the projection lens assembly. The member is held floating within a certain range in the vertical direction, front-rear direction, and left-right direction by swinging around each horizontal axis and the elastic flexibility of the arm members, and the pair of arm members are A member is provided that constantly rotates and biases the lens holder toward the film holding assembly, and the end surface of the lens holder on the film holding member side is brought into pressure contact with the opposing member surface on the film holding assembly side with a predetermined pressing force, thereby projecting lens light onto the film surface. The object of the present invention is to provide a film projection device characterized by automatic vertical alignment of the shaft.

[For production]

By configuring the lens holder floating mechanism as described above, the lens holder can be smoothly floated up and down, back and forth, and left and right without creating any play gaps that allow the lens holder to move back and forth and left and right to a certain extent. A mechanism is constructed to allow this. Therefore, it does not cause rattling,
Usability is improved.

〔Example〕

1 to 4 show one embodiment. The projection lens assembly 6 of this example is constructed as a unit that can be attached or detached to a predetermined position in the main body of a device such as a microfilm reader or a league printer, and is of a single lens drop-in φ floating type. In addition, the support point position of the lens holder in the floating mechanism can be adjusted in height to correspond to the level of the surface level of the lens holder press-contact member on the side of the used film holding assembly that is attached to and removed from the main body of the device. It is.

Figure 1 is a longitudinal cross-sectional side view of the lens unit installed in a predetermined position on the main body of the device, and Figure 2 is a lower part of the lens holder corresponding to the upper surface level of the film holding carrier, which is higher than in Figure 1. The same figure shows the end face position adjusted to a higher position, and Figure 3 is an exploded perspective view of the lens unit.
FIG. 4 is a diagram showing a state before installation or a state in which it is removed.

Reference numeral 20 denotes a lens unit attachment/detaching support that is firmly fixed with screws or the like at a predetermined lens unit mounting position on the apparatus main body side (in this example, a predetermined position on the lower surface of the ceiling plate 4 in the apparatus main body cavity 2) with its longitudinal direction in the front-rear direction. Railp 1/-1. 21
・21 is a screw hole, 22, 22 is a rail edge provided along the length of the left and right sides of the plate, and 23, 23 is a cam-shaped click protrusion provided in the middle of each of the left and right rail edges 22, 22. , when receiving a pressing force, it sinks downward against the elasticity of the connecting portions 23a-23a. 24 is a notch recess formed in the center of the front edge of the plate, and 25 is a light transmitting window hole formed in the center of the plate surface.

Reference numeral 30 denotes an upper main frame of the lens unit 6, and the lens unit 6 is attached to and removed from a predetermined position on the apparatus main body side by engagement between this upper main frame and the rail plate 20 provided on the apparatus main body side. Reference numerals 31 and 31 indicate rail strips provided inwardly facing each other along the upper edge lengths of the left and right frame sides of the main frame, and 32 and 32 indicate midway portions of the left and right rail strips 31 and 31. 33 is a rear wall plate provided with a downward JL on the side without the frame, 34 (34) is an engaging claw protrusion provided outward on the lower edge of the left and right sides of the rear wall plate, respectively. ,
35 is a convex portion provided inward at the center of one front side;
6 (3Ei) is an anti-slip protrusion formed on the surface of the lens unit gripping portion, with the outer surface portions on the front end side of the left and right sides of the frame serving as the lens unit gripping portions.

Left and right rail strips 31 of the upper main frame 30 on the lens unit 6 side are provided on the tip side of the rail plate 20 on the device main body side.
- Move the rear end side of 31 to the corresponding position and engage the left and right rail edges 22, 22 on the rail play 1, 20 side with the left and right rail strips 31, 31 on the upper main frame 30 side, and connect them to the rail plate 20. Push in while sliding the upper main frame 30 (arrow C in FIG. 4). While pushing the slide, the upper main frame 3
The rear end of each of the left and right rail strips 31, 31 on the 0 side abuts on the click protrusions 23, 23 present in the middle of the left and right rail edges 22-22 on the rail plate 20 side, respectively. When the upper main frame 30 is pushed further against the abutment resistance, the click protrusions 23, 23 sink downward against the elasticity of the connecting portions 23a, 23a, allowing the upper main frame 30 to continue pushing movement. be done. Then, when the convex part 35 on one front side of the upper main frame 30 is engaged with the notch recess 24 on the leading edge side of the rail plate 20 and pushed in sufficiently until it hits, the upper main frame will be at the click protrusion 23 position. The notch recesses 33, 33 existing in the middle of the rail strips 32, 32 on the 30 side are located in corresponding positions, and the click protrusions 23, 23 move upward and engage with the recesses 33, 33. This allows the upper main frame 3
0, that is, the lens unit 6 is positioned and supported at a predetermined position in the main body of the apparatus (as shown by the two-dot chain line in FIGS. 1 and 4).

To remove the lens unit 6 that is mounted and supported on the main body of the device, move the upper main frame 30 of the lens unit 6 in the direction opposite to the above-mentioned mounting direction (arrow d in FIG. 4) through the four notches 33 that engage with each other.・By pulling against the engagement force between the click protrusions 23 and 33, the click protrusions 23 move downward and disengage from the notch recesses 33.
Thereafter, the upper main frame 30 is smoothly pulled out from the rail plate 20, and the lens unit 6 is easily removed from the main body of the apparatus (FIG. 4).

In this embodiment, in order to smoothly insert and remove the upper main frame 30 from the rail plate 2o, the rail plate 20
The left and right rail edges 22 are tapered rail edges that are slightly tapered in front of each other. Corresponding to this, the upper main frame 3
The engagement rail strips 31 and 31 on the 0 side are also tapered rail strips that taper toward the front of each other.

Reference numeral 40 indicates a lower main frame of the lens unit 6, 41 indicates a helicoidal female cylinder fitting hole provided in the lower main frame, and 42 indicates a rear wall plate provided upward on the frame side; Board 42
The downward rear wall plate 33 of the upper main frame 3° is fitted into the inside of the upper main frame 30, and when it is fully fitted, the engaging claw protrusion 34 on the upper main frame 30 side
(34) are fitted into and engaged with the engagement holes 43, 43 provided on the lower main frame 30 side, so that the upper and lower main frames 30, 40 are engaged and integrated.

Reference numeral 50 denotes a helicoid female cylinder support member, and a pair of L-shaped arms 52 are provided on the left and right sides of the horizontal axis 51 in the left-right direction.

A vertical bearing plate 55 is provided at the tip of each horizontal arm 54.
55 are provided facing each other. Reference numerals 56 and 56 are bearing holes formed in these bearing plates. 56a and 56b are four semicircular notches provided at the upper and lower edges of each of the bearing plates 55, respectively.

Regarding this helicoid female cylinder support member, each of the left and right vertical arms 53 (a) is a spring arm plate having elastic flexibility in the front-rear direction.

b. Each of the left and right horizontal arms 54 is provided with a downwardly bent portion 57φ57 at a portion closer to the horizontal axis 51, so that the six arms 54
・A certain degree of flexibility in elastic deflection in the vertical direction is given to each of the parts 54.

C1 The bearing plates 55, 55 at the tip of each horizontal arm 54, 54 move in the left-right direction (Fig. 3e
This gives a certain degree of flexibility in elastic deflection in the f-direction) and the torsion direction (f-direction).

d, horizontal shaft portion 51a between the left and right L-shaped arms 52;
It also gives a moderate amount of elastic torsional freedom.

The above-mentioned helicoidal female cylinder support member 50 includes left and right ends 51b-51b of the horizontal shaft 51 and left and right L-shaped arms 52, 52.
The bearing having the shaft portion 51a between the two on the rear frame side of the lower main frame 40 is fitted into the grooves 44b (44b) and 44a and is supported, so that the lower main frame 40 and the upper main frame 30 are connected. When integrated as described above, the rear wall plate 33 on the upper main frame 30 side
A convex portion 37 provided on the lower edge of the bearing of the lower main frame 30 is positioned opposite to the groove 44a, thereby preventing the shaft 51 from swinging.

Each vertical arm 53-53 serving as a spring arm plate of the left and right L-shaped arms 52, 52 is attached to the inner surface of the rear wall plate 33 of the upper main frame 30 which is fitted inside the rear wall plate 42 of the lower main frame 40. The horizontal arms 54 are urged to rotate downward about the shaft 51 by elastically contacting the horizontal arms 54 . The downward rotation of the horizontal arms 54, 54 about the axis 51 is such that the lower surfaces of the base sides of the horizontal arms 54, 54
The angle is limited to the angle until it comes into contact with a part of the

60 is helicoid female cylinder, 61a (81a)φ
61b ([11b) is a pair of upper and lower shaft pins which are fitted at two locations 180° opposite each other on the outer surface of the side circumference thereof, and 62 is a lower end flange. This helicoidal female cylinder 60 connects the upper shaft pin 61 a (Eila) between the bearing plates 55 of the left and right L-shaped arms 52-52 to the bearing hole 56 of the bearing plate.
・Insert into 56 (Fig. 1) or lower shaft pin 61
b (Ellb) is inserted (Fig. 2) and supported by a bearing.

Upper shaft pin 61a (eta) of helicoid female cylinder 60
When the bearing holes 56-56 of the bearing plates 55-55 bear the bearing plates 55-55, the lower shaft pins 6lb (fllb) are located correspondingly in the notch recesses 56b and 56b on the lower edge side of the bearing plates 55 and 55. (Figure 1). Also, the lower shaft pin 6 l b
(131b) is mounted in the bearing holes 56, 56 of the bearing plates 55, 55, the upper shaft pin 61a (81a) is the notch recess 56a, 56a on the upper edge side of the bearing plate 55, 55.
(Fig. 2).

Each of the above notched recesses 56a, 56a, 56b-56b (
7) The size is the shaft bin 61a (61a), 61b (8
It should be suitably larger than the diameter of 1b).

The helicoid female cylinder 60 supported between the bearing plates 55 and 55 as described above has a shaft pin 61 a (81
a) or 6lb (Blb), the notched recesses 56b, 56b and the shaft pin 6lb (Blb) or the notched recessed part 56a* 56a and the shaft pin 61a (
81a) or within the range restricted by the front and rear guard walls 46a and 46b integral with the lower main frame 40.

70 is a helicoid male tube screwed into the helicoid female tube 60 from the upper end side, and both female and male tubes 60-7
0 is the lens holder. Reference numeral 71 indicates a protrusion for rotation operation provided on the outer periphery of the male cylinder 70, and reference numeral 72 indicates a rotation range regulating stopper piece. When the helicoid male cylinder 70 rotates counterclockwise with respect to the female cylinder 60, the stopper piece 72 comes into contact with the first receiver on the lower main frame 40 side and is received by the part 45a, and the helicoid male cylinder 70 rotates clockwise. As it progresses, the first receiver has a portion 45a and approximately 18
The second receiver on the opposite side of 0° is received by contacting the portion 45b, so that the helicoid male tube 70 is attached to the helicoid female pigeon 60 within the approximately 18o0 range between the first and second receiving portions 45a and 45b. On the other hand, it can be rotated freely.

Single lens barrel 80 for the above helicoid male barrel 70
is set by dropping it from the upper end of the male cylinder.

The above-described members 30-40, 50-60, and 70-80 constitute a single-lens drop-in/floating type projection lens unit body 6 that is detachable from the neck wear body.

In the γ1 state, the lower surface of the lower end flange 62 of the helicoidal female cylinder 60 is placed on the upper surface of the upper platen glass lOO on the roll film carrier 5 side as a film holding assembly, as shown in the first figure.
Oscillating around the horizontal axis 51 of 0, helicoid female cylinder 60
The shaft bottle 61a (81a) or the same 6lb (81
b), and the floating of the helicoid female cylinder 60 due to the elastic bending freedom or twisting freedom of each part of the helicoid female cylinder holding member described in items a to d above, so that the helicoid female cylinder 60 is elastically maintained at a predetermined approximately constant level. The optical axis of the lens is automatically vertically aligned with respect to the film.

The male helicoid barrel 70 with the single lens barrel 80 set therein is rotated to the left or right by an appropriate amount with respect to the female barrel 60, thereby removing the male barrel 70, that is, the single lens barrel 80.
moves up and down with respect to the female barrel 60 to change the position of the single lens barrel 80 relative to one surface of the film, thereby adjusting the focus.

Left and right L-shaped arms 52 of the helicoid female cylinder holding member 50
- 52 may be configured as separate left and right members as shown in the fifth figure, and may be provided with bearings on the bearing portions on the lower frame 40 side. In this case, each horizontal arm 54 has a vertical direction. Bent portion 57 for providing a certain degree of elastic flexibility
-57 can be omitted.

Axial pin 61 a (81 a) of helicoid female cylinder 60
Or, the rotation movement range around 6 l b (Blb) can be controlled by the front and rear guard walls 46a and 4 that are integral with the lower main frame 40.
6b, the bearing plates 55 have notched recesses 56a (5θa) and 56 on the upper and lower edges as shown in FIG.
It may be of a form having only the bearing holes 56, 56 without b (58b).

Next, in FIG. 1, when the top surface level of the upper platen glass 100 on the film holding assembly 5 side, which the lower surface of the lower end flange 62 of the helicoidal female cylinder 60 serving as a lens holder comes into contact with, is A, FIG. The holding assembly 5 further has a film frame search device 102 on the upper platen glass 100, and the bottom surface of the lower end flange 62 of the helicoidal female tube 60 is brought into contact with the top surface of the frame search device 102. Position level A1 when the top position level A2 of the search device 102 is as shown in FIG. 1 above.
This shows a case where it is considerably higher than . In Fig. 2, 102a is the outer frame of the frame searcher, work 02b11102
0 is a prism and a photoelectric converter as a coma detection element.

In the above case, the frame search device LO2 with a high position level
If the lower surface of the lower end flange 62 of the helicoidal female tube 60 on the side of the projection lens assembly 6 were simply brought into contact with the upper surface, the floating pressure would be excessively greater than in the case of FIG. 1, and the floating effect could not be obtained. Since it is not compatible with the projection lens assembly 6, it becomes impossible to use the film holding carrier 5 of this type by converting it into the main body of the apparatus.

Therefore, in such a case, the support of the helicoidal female cylinder 60 of the projection lens assembly 6 by the support member 50 is changed as shown in FIG.

That is, the lower shaft pin 61b of the helicoid female cylinder 60 (
61b) is inserted into the bearing holes 56 of the bearing plate, and the helicoid female cylinder 60 is reassembled and used so that it is supported by the bearing on the support member 50.

Then, the helicoidal female cylinder 60 on the projection lens assembly 6 side is entirely moved upward relative to the film holding carrier 5 by the distance between the upper shaft pin 61a and the lower shaft pin 61b than in the case of FIG. Therefore, the lower end flange 6 of the helicoidal female cylinder 60 is connected to the upper surface of the frame searcher 102 at the high position level A2 on the side of the film holding carrier 5.
The floating pressure contact force on the lower surface of No. 2 is in a proper state.

Upper and lower shaft piers that change the support point of the helicoid female tube 60
If 61 a (61 a) to 6 l b (81 b) are further increased, even more changes in the upper surface position level on the film holding carrier 5 side can be coped with.

Figures 7 and 8 show other embodiments. In this example, the floating mechanism side fulcrums 61 and 6 of the helicoid female cylinder 60 are
1 and the end face 62 on the side of the film holding assembly, a vertically movable male threaded cylinder 65 is screwed into the lower end side of the helicoid female cylinder 60 in order to make it possible to continuously adjust the length of the part between the film holding assembly side end face 62. By turning to adjust the amount of downward protrusion from the helicoidal female cylinder 60, it is possible to adjust steplessly whether the upper surface level on the side of the film holding carrier 5 is low (FIG. 7) or high (FIG. 8).

Reference numeral 66 indicates a set screw that locks the adjusted rotational position of the threaded cylinder.

C1 Effects of the Invention As described above, the present invention provides a lens holder floating mechanism that allows the lens holder to be moved up and down, back and forth, left and right, without the presence of play gaps that allow the lens holder to move back and forth and left and right to a certain extent. Since it has a structure that allows it to float smoothly, there is no rattling and it is comfortable to use, and the intended purpose is well achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a vertical sectional side view of the projection lens assembly unit mounted at a predetermined position on the main body of the device, and Fig. 2 is a longitudinal side view of the projection lens assembly unit attached to the film holding carrier at a high top level. Figure 3 is an exploded perspective view of the projection lens assembly unit, and Figure 4 shows the projection lens assembly unit before it is attached to the device body or after it has been removed. Fig. 5 is a state diagram, Fig. 6 is a perspective view showing a modified example of the helicoidal female cylinder holding member, and Fig. 7 is
The figure is a longitudinal sectional front view of the main part of another embodiment unit, and Figure 8 is the same figure as above with the threaded cylinder screwed into the helicoidal female cylinder in accordance with the film holding carrier with a high upper neck level.
FIG. 9 is a schematic configuration diagram of an example of a microfilm league printer, and FIGS. 10 and 11 are respectively explanatory diagrams of the configuration of a conventional floating mechanism. 5 is a film holding assembly, 6 is a projection lens unit, 60 and 70 are a helicoid female cylinder and a helicoid male cylinder as lens holders, and 80 is a single lens barrel. Figure 5 Figure 11 Figure 10

Claims (1)

[Claims] (1) A pair of substantially parallel arm members are supported by a fixed member on the projection lens assembly side so as to be able to swing freely around a horizontal axis, and a lens holder is placed between the pair of arm members so that the horizontal axis is the center of swing of the arm members. By supporting the lens holder so that it can freely swing around horizontal axes whose axes are substantially parallel, the lens holder can swing around each of the above-mentioned horizontal axes with respect to the opposing member on the film holding assembly side that faces the projection lens assembly. and a member that maintains the arm members floating within a certain range in the vertical, longitudinal, and horizontal directions due to the elastic flexibility of the arm members, and that constantly urges the pair of arm members to rotate toward the film holding assembly. A film projection system characterized in that the end surface of the lens holder on the side of the film holding member is brought into pressure contact with the surface of the opposing member on the side of the film holding assembly with a predetermined pressing force to automatically vertically align the optical axis of the projection lens with respect to the film surface. Device.