JPH0643550A - Flat bed type microcamera - Google Patents

Abstract

PURPOSE:To lessen the possibility that a contact roller in rolling contact with a film generates dents on a film and the possibility that the contact roller generates rubbing flaws on the film according to the intermittent feed of the film, to obviate the generation of the burrs of chrome plating on the surface of the contact roller in contact with the film and to eliminate the need for a deburring operation. CONSTITUTION:This microcamera has the drive roller 53 formed with an annular groove 100 into which the film is inserted and which acts to position the film in its transverse direction and the contact roller 56 which is formed of a hollow cylinder and presses the film toward the drive roller 52. The outer peripheral surface of the contact roller 56 is formed of a central part consisting of a cylindrical surface and both ends consisting of curved surfaces which are continuous with this central part and increase in the angle formed by the tangent thereof and the axial line of rotation continuously from the central part. The contact roller 56 is formed of a hollow cylinder made of aluminum subjected to chrome plating on the surface and is supported on a supporting shaft 104 by roller bearings 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat-bed type micro camera for displaying a reduced image of a subject on a film held between an aperture mask and a flat plate.

[0002]

2. Description of the Related Art A film is sandwiched between an aperture mask (hereinafter simply referred to as a mask) perpendicular to the optical axis of a taking lens and a pressure plate, and a reduced image of a subject is taken on the film through a window of a frame formed on the mask. Flat-bed microcameras designed to fit in are known.

The pressure plate can be pressed and separated from the mask. The pressure plate is separated from the mask to feed the film, and the pressure plate is pressed against the mask to fix the film. Photography is performed with this film fixed.

FIG. 7 is an exploded view showing the structure of a conventional drive roller 2 and contact roller 3 for feeding the film 1. The film 1 is sandwiched between the rollers 2 and 3 and is fed intermittently. An annular groove 4 having a width substantially equal to the width of the film 1 is formed on the outer peripheral surface of the drive roller 2. The film 1 is engaged with the annular groove 4 and positioned in the width direction.

The contact roller 3 has a width substantially equal to that of the annular groove 4 and is pressed by a spring so as to engage with the annular groove 4. Therefore, when the drive roller 2 rotates, the film 1 sandwiched between the drive roller 2 and the contact roller is fed. The contact roller 3 is made of metal in a thick-walled cylindrical shape and is held by the support shaft 6 via a bush 5 made of resin or the like press-fitted therein.

[0006]

2. Description of the Related Art Here, in the conventional contact roller, both edges are chamfered by the conical surface 3a. Therefore, a sharp edge 3b having an angle β with respect to the rotation axis F is formed at the intersection of the conical surface 3a and the cylindrical surface of the contact roller 3. Therefore, when the contact roller 3 is pressed against the film 1 and rotated, the edge 3b causes a trace, that is, an indentation, on the film 1, which causes a problem that the image quality of the microfilm is deteriorated.

Further, since the conventional contact roller 3 is thick and heavy, it has a large moment of inertia and a large rotational friction resistance. As the film 1 is intermittently fed, all the other rollers such as the contact roller 3 and the tension roller are also intermittently repeatedly rotated and stopped. However, the inertia moment and the rotational friction of these rollers are repeated. If the resistance is large, the rotation cannot follow the movement of the film 1, and the surface of the film 1 is rubbed. This is one of the causes of scratching the film 1 and further degrading the image quality of the microfilm.

In particular, when the surface of the contact roller 3 or the like is plated with chrome, burrs due to this plating are likely to occur on the edge 3b as well, and therefore it is necessary to remove the burrs.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is less likely that an indentation is formed on a film when the contact roller rolls on the film, and the contact roller is accompanied by intermittent feeding of the film. A first object of the present invention is to provide a flat-bed type micro camera in which the risk of scratches on the film is reduced.

It is also an object of the present invention to provide a flat-bed type micro camera in which, when chrome plating is applied to the surface of the contact roller, plating burrs do not occur on the film contact surface and the work of removing burrs is unnecessary. The purpose is 2.

[0011]

According to the present invention, a first object is to sandwich a film between an aperture mask and a pressure plate which are perpendicular to the optical axis of a photographing lens, and form a reduced image of a subject by the photographing lens on the aperture mask. In a flat-bed type micro camera for transcribing the film through the frame window, the drive roller provided with an annular groove into which the film is inserted and positions the film in the width direction, and the hollow roller formed into a hollow cylinder are inserted into the annular groove. A contact roller that presses the film against the drive roller, the outer peripheral surface of the contact roller having a central portion formed of a cylindrical surface,
The present invention is achieved by a flat-bed type micro camera characterized in that the center portion is formed by both end portions each having a curved surface whose tangent line makes an angle with the axis of rotation continuously increasing from the center portion.

A second purpose is to provide a contact roller,
It is achieved by forming the surface of the hollow cylinder made of aluminum with chrome plating on the surface and supporting it on a support shaft by a roller bearing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an external perspective view of a flat-bed type micro camera,
2 is a front view showing the internal structure of the camera, FIG. 3 is an enlarged perspective view near the mask, and FIG. 4 is an exploded perspective view near the pressure plate.

In FIG. 1, reference numeral 10 is a stand, and 12 is a horizontal photographing plate. An object such as a document is placed in accordance with the corner marks of the photographing plate 12. A column 14 is vertically erected from the back side of the photographing plate 12 on the stand 10, and a camera mount 16 is attached to the column 14 so as to be able to move up and down. The camera mount 16 is fixed at a predetermined height according to the photographing reduction ratio.

A photographing lens 18 (see FIG. 1) is fixed to the camera mount 16 vertically toward the photographing plate 12. A camera head 20 is attached to the upper surface thereof. The camera head 20 is rotatable about the optical axis of the lens 18, that is, the vertical axis, and can be fixed by tightening a lock lever 22.

Reference numeral 24 is an automatic exposure device, 26 is a lamp cover having a built-in illumination lamp, 28 is a display panel, and 30 is a control panel. The display panel 28 displays the driving status such as the frame size and the shooting. The control panel 30 is used to make various settings such as film sensitivity setting, number and mode for printing on film.

Next, the internal structure of the camera head 20 will be described with reference to FIGS. Note that FIG. 2 shows a state in which the cover plate 32 of the camera head 20 is opened upward. 2 and 3 34
Is a supply box accommodated on the left side of the camera head 20, and an unphotographed film 36 is accommodated therein. FIG. 2 also shows the lid plate 38 of the supply box 34 opened upward. In the supply box 34, the swing lever 40 monitors the remaining amount of the film 36 wound on a supply reel (not shown).

An aperture mask 44 is attached to the lower frame 42 of the camera head 20 so as to be removable from the front. A frame window 46 is formed on the mask 44 as shown in FIG.
The mask 44 is fixed at a position on the optical axis of. A light shielding plate 48 for discriminating the mask type is provided on the mask 44, and when the mask 44 is set on the frame 42, the camera head 20 automatically discriminates the type of the mask 44 from the position of the light shielding plate 48.

Reference numeral 50 is a guide roller, and 52 is a drive roller, which are arranged on the left and right sides of the mask 44 with the mask 44 interposed therebetween. The film 36 supplied from the supply box 34 is guided by the light blocking roller 54 provided in the supply box 34 and the guide roller 50 to reach the upper surface of the mask 44. Then, it is sandwiched between the drive roller 52 and the contact roller 56, and further wound on a winding-side reel (not shown) while a predetermined tension is applied by the tension roller 58. The take-up reel is loaded while being accommodated in a magazine (not shown), and engages with the take-up shaft 60 to rotate.

Reference numeral 62 is a pressure plate. The pressure plate 62 is shown in FIG.
As shown in FIG. 5, the upper plate 64 is superposed and is connected with the screw 66. A concave portion 68 for forming an air chamber is formed between the upper surface of the pressure plate 62 and the upper plate 64.
A plurality of small holes 70 communicating with the lower surface of the pressure plate 62 are opened at 8.

A pipe 72 stands upright in the center of the upper plate 64,
A coil spring 76 is compressed between the flange 74 fixed to the pipe 72 and the upper plate 64. A rubber tube 78 is connected to the pipe 72 (see FIGS. 2 and 3), and the other end of the tube 78 is connected to a diaphragm type air pump (not shown). The pipe 72 communicates with the recess 68 of the pressure plate 62.

The pressure plate 62 is vertically driven by an electromagnetic actuator 82 via an L-shaped bracket 80. That is, as shown in FIG. 4, the lower horizontal portion 80a of the bracket 80 is sandwiched between the washer 74 fixed to the pipe 72 and the coil spring 76, while the vertical portion 80b of the bracket 80 has two screws on the frame 42. It is held so as to be vertically movable by 84 and 86.

The electromagnetic actuator 82 is the plunger 8
2a and the electromagnetic coil 82b (FIG. 3), the lower end of the plunger 82a is attached to the upper end of the vertical portion 80b by a pressure release lever 88. Further, both ends of a tension coil spring 90 are locked to the lever 88 and the lower screw 86.

Therefore, the coil spring 90 imparts a downward habit to the plunger 82a and the bracket 80, and the pulling force of the spring 90 causes the pressure plate 62 to move.
Is pressed against the mask 44 via the coil spring 76. Therefore, at the time of photographing, the film 36 placed on the mask 44 is sandwiched and positioned between the mask 44 and the pressure plate 62.

At this time, the plunger pump sucks the negative pressure inside the recess 68 through the tube 78 and the pipe 72, and the film 36 is sucked from the small hole 70 to the lower surface of the pressure plate 62. Therefore, the film 36 adheres to the lower surface of the pressure plate 62 without slack in the frame window 46 of the mask 44, and the plane accuracy of the film 36 at the time of photographing is improved.

When the film 36 is moved, the electromagnetic solenoid 82b of the electromagnetic actuator 82 is excited, and the pressure plate 62 is attracted upward together with the plunger 82a. As a result, the pressure plate 62 separates from the film 36, and the film 36 becomes movable. In this state, the drive roller 52 is rotated by a predetermined angle to feed the film 36 by one frame, and the unphotographed area of the film 36 is put in the frame window 46.

Next, the contact roller 56 will be described with reference to FIGS. FIG. 5 is an exploded view showing the contact roller 56 in cross section together with the drive roller 52, and FIG. 6 is a view showing the surface shape of the contact roller 56. The drive roller 52 has an annular groove 100 having substantially the same width as the film 36 on the outer peripheral surface thereof. Further, the contact roller 56 has substantially the same width as the annular groove 100, and rolls while pressing the film 36 against the annular groove 100.

The contact roller 56 is made of aluminum into a substantially thin cylindrical shape, and is held on the support shaft 104 by two roller bearings 102, 102. That is, the two roller bearings 102, 102 have a retaining ring 108 fixed to the support shaft 104 with a spacer 106 interposed therebetween.
It is sandwiched between the nut and the nut 110.

The outer peripheral surface 112 of the contact roller 56 is
As shown in FIG. 6, a central portion 112a having a cylindrical surface,
Both ends 112b smoothly continuing to the central portion 112a
(Only one is shown in FIG. 6). In both end portions 112b, an angle α formed by a tangent line B on a plane including the rotation axis line A with the rotation axis line A and an angle α formed by a tangent line C (parallel to the rotation axis line A) in the central portion 112a with the rotation axis line A = 0.
It is formed by a curved surface that continuously increases smoothly.

For example, the curved surfaces of the both end portions 112b can be formed as follows. That is, on a plane including the rotation axis A, a curved surface obtained when an arc of radius R having a center E on a straight line D passing through the edge of the central portion 112a and orthogonal to the rotation axis A is rotated about the rotation axis A. can do. Instead of the circular arc having the radius R, a curved surface obtained by rotating a curve of another shape such as an elliptic curve or a quadratic curve around the rotation axis A may be used.

It is desirable that the surface of the contact roller 56 (film contact surface) be plated with chrome. At this time, since there is no edge on the surface of the contact roller 56, burrs due to plating do not occur on the surface. It should be noted that it is preferable to perform a Raydent treatment (a plating treatment name of Yoshizaki Plating Co., Ltd.) when applying the chrome plating because the plating surface color can be made black.

In the above embodiment, the contact roller 56 made of aluminum is used, but hollow stainless steel may be used instead of aluminum, or conductive resin plated synthetic resin may be used. Also, this contact roller 56
Is applied to the light blocking roller and the tension roller 58,
It is desirable to reduce these moments of inertia and rotational friction resistance. In this case, slippage between the rollers 54 and 58 and the film 36 due to intermittent running of the film 36 can be reduced, and scratches generated on the film 36 due to the slippage can be reduced.

[0033]

As described above, according to the invention of claim 1, both end portions (112b) of the outer peripheral surface of the contact roller (56) are
Since the angle (α) formed by the tangent line (B) and the rotation axis (A) continuously increases from the central portion (112a) side, the film (36) is provided with the contact roller (56). There is less risk of indentation on the film (36) when they come into contact with each other.

Further, since the contact roller (56) is made of a hollow cylinder, it is lightweight and has a small moment of inertia. Therefore, when the film (36) is intermittently fed, less slippage occurs on the surface of the film (36), and this slip reduces scratches on the film (36).

If the contact roller (56) is made of an aluminum hollow cylinder and the surface is chrome-plated and is pivotally supported by a roller bearing, the rotation will be smoother and the surface of the film (36) will be smooth. The scratches caused by slippage can be further reduced (Claim 2). If the light-shielding roller (54) and the tension roller (58) are also formed of hollow cylinders like the contact roller (56) to reduce the moment of inertia, the slip of these rollers is also reduced and the film (36) is not damaged. It is possible to further reduce.

[Brief description of drawings]

FIG. 1 is a perspective view showing the appearance of a flat-bed type micro camera.

FIG. 2 is a front view showing the internal structure of the camera head.

FIG. 3 is an enlarged perspective view around a mask.

FIG. 4 is an exploded perspective view near the pressure plate.

FIG. 5 is a diagram showing a cross section of a contact roller and a drive roller.

FIG. 6 is a diagram showing a surface shape of a contact roller.

FIG. 7 is a view showing a cross section of a conventional contact roller and a drive roller.

[Explanation of symbols]

 18 Photography Lens 36 Film 44 Aperture Mask 46 Frame Window 52 Drive Roller 56 Contact Roller 62 Pressure Plate 100 Annular Groove 102 Roller Bearing 112 Contact Roller Outer Surface 112a Center Part 112b Both Ends A Rotation Axis B, C Tangent α Angle

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[Procedure amendment]

[Submission date] February 16, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 2]

[Figure 3]

[Figure 1]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

Claims (2)

[Claims] 1. A flat floor system in which a film is sandwiched between an aperture mask and a pressure plate which are perpendicular to the optical axis of a photographing lens, and a reduced image of a subject is photographed on the film through a frame window formed in the aperture mask. In a micro camera, a drive roller having an annular groove formed therein for positioning the film therein and for positioning in the width direction thereof, and a contact formed of a hollow cylinder for engaging the annular groove and pressing the film against the drive roller Both ends of the contact roller, wherein the outer peripheral surface of the contact roller has a central portion formed of a cylindrical surface, and a curved surface which is continuous with the central portion and whose tangent to the rotation axis increases continuously from the central portion. A flat-bed type micro camera characterized by being formed by and. 2. The flat-bed micro camera according to claim 1, wherein the contact roller is formed of an aluminum hollow cylinder having a surface plated with chrome, and is supported by a roller shaft on a support shaft.