JPH0518744Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a portable microcomputer in which a screen for projecting reproduced images and a mirror for bending the projection optical axis are attached to the reader body so that they can be raised and lowered. This relates to film readers.

[Conventional technology]

For example, a microfilm reader is used to enlarge a photographic image recorded on a 16mm wide roll film to about A4 size for viewing. Such a microfilm reader includes a cassette loading section into which a cassette containing wound microfilm is loaded, a light source section which illuminates a predetermined frame of microfilm pulled out from the cassette, and an image of the illuminated predetermined frame. It includes a projection optical system that magnifies and projects an image, and a screen on which an enlarged image projected by the projection optical system is projected. In recent microfilm readers, in consideration of portability when not in use, a device has been devised in which the screen can be folded to form a compact, thin box-like structure.

In addition, in order to enlarge the image projected on the screen while keeping the reader body compact,
Generally, the projection optical axis is bent using a mirror to extend the optical path length. The mirror used for this purpose is also configured to be able to rise and fall freely when considering portability when the microfilm reader is not in use.

[Problem that the invention attempts to solve]

However, in the conventional microfilm reader equipped with the above-mentioned movable screen and mirror, in addition to raising the screen, it is also necessary to raise the mirror as a preparatory operation for use. For this reason, the preparation operation becomes complicated, and at the same time, both the screen and the mirror must be positioned at respective use positions, which tends to make the structure complicated.

This invention was made to solve the drawbacks of the conventional microfilm reader as mentioned above.
To provide a portable microfilm reader which simplifies operation by raising and lowering a mirror in conjunction with the raising and lowering of a screen, and also enables smooth raising and lowering of the screen and mirror.

[Means for solving problems]

In order to achieve the above object, the present invention includes a frame body that holds a screen, one end of which is pivoted to the reader body, and the other end of which is engaged with a guide groove formed in the lid body; A mirror frame having an engaging part slidably fitted into a groove formed in the main body and rotatable around the engaging part, one end being pivotally attached to the leader body and the other end being pivoted to the upper end of the mirror frame. a mirror arm having a cam groove formed in its intermediate portion, a screen arm having one end pivoted to the frame body and the other end engaging the cam groove, and the other end of the screen arm being a mirror arm. a first spring biasing toward the other end of the arm; and a second spring biasing the mirror frame so as to slide to a use position in which the engaging portion of the mirror frame is brought into contact with one end of the groove. The spring constitutes a mechanism for raising the screen and mirror of the portable microfilm reader.

[Effect]

In use, when the frame holding the screen is raised, the lid is opened accordingly. The screen arm has one end pivoted to the frame, and the other end engages with a cam groove of the mirror arm, so that the mirror arm is rotated and raised to the use position when the screen is raised. The mirror frame that holds the mirror is pivoted to the tip of the mirror arm, so the mirror rotates in conjunction with the rotation of the mirror arm, and the other end of the screen arm comes into contact with the end of the cam groove. The engaging portion provided on the mirror frame comes into contact with the end of the groove formed on the leader body, and the mirror is positioned at the use position.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

〔Example〕

In FIGS. 1 and 2 showing the microfilm reader using the present invention in an unused state and a used state, respectively, the reader main body 1 has an upper lid that can be opened and closed via a well-known hinge mechanism provided at the rear end. 2 is installed. When the buttons 3 provided on both sides of the top cover 2 are pressed in the state shown in FIG. As the screen 5 opens, the screen 5 rises up to follow this.

A plurality of light shielding plates 8 are provided on both sides between the screen frame 7 holding the screen 5 and the reader body 1. These light shielding plates 8 are composed of a plurality of blades, and the screen 5
As the reader stands up, it is pulled out one after another, and the triangular opening formed by the reader main body 1, the upper lid 2, and the screen frame 7 is shielded from light. Further, since the upper lid 2 blocks light from the back side of the screen 5, the rear side of the screen 5 is kept completely shielded from light by the upper lid 2, the light shielding plate 8, and the reader main body 1.

A keyboard 10 and a liquid crystal display panel 11 are provided on the front side of the reader main body 1. When in use, the liquid crystal display panel 11 is erected as shown in FIG. 2 and held in a position where the display can be easily viewed. In addition, a keyboard 10 and a liquid crystal display panel 1
1 is adapted to rise to the position shown in FIG. 4, and a cassette holder 100 is attached to its lower surface. With the cassette holder 100 moved to the raised position shown in FIG. 4, the cassette 12 containing the wound microfilm is loaded and unloaded.

The cassette 12 includes a supply reel 13 and a take-up reel 14, as shown in FIG. 3A. The cassette 13 includes a guard panel 15 which is normally locked in the closed position. When the lock release button 16 is pressed, the guard panel 15
is unlocked and can be opened as shown in FIG. 3B. Guard panel 15
is released, the microfilm 2
0 is exposed. A magnetic tape 21 is connected to the leading end of the microfilm 20, and search information and the like regarding the image taken on the microfilm 20 are recorded on the magnetic tape 21. At the beginning of the winding of the microfilm 20, the table of contents information recorded on the magnetic tape 21 is read by the magnetic head and displayed on the liquid crystal display panel 11. Furthermore, blip marks 20a are recorded on the margins of each frame of the microfilm 20, and as is well known, by optically detecting these, the number of frames to be advanced can be counted. A space 18 is formed at the bottom of the cassette 12 so as to penetrate into the back surface of the microfilm 20. As will be described later, during use, a part of the illumination optical system enters this space 18 to provide illumination from the back side of the microfilm 20.

After raising the cassette holder 100 as shown in FIG. 4 and inserting the cassette 12 into it,
When the cassette holder 100 is pushed down together with the keyboard 10, the cassette holder 100 and the keyboard 10 are locked in the position shown in FIG. Also, the cassette 12 is placed in the cassette holder 100.
When a certain amount of the lock is inserted, the lock release button 16 is pushed by the lock release plate 19. Then, when the cassette holder 100 is lowered, the guard panel 1
5 is opened upward as shown in FIG. 3B, and the liquid crystal display panel 11 is also pushed up to the use position shown in FIG. 2 by being pressed by this. Also, when the cassette holder 100 is locked in the lowered position, the supply reel 13,
Drive shafts 22 and 23 (FIG. 4) engage hubs formed on the bottom surface of each take-up reel 14.
Therefore, by driving the motor built into the reader body 1 to drive one of the drive shafts 22 and 23 and to follow the other, the microfilm 20
will be able to be sent accordingly.

In FIGS. 5 and 6, which show the screen 5 in an upright position, the space 18 formed in the cassette 12 has a cold storage space for directing the illumination light from the lamp 24 and the light source mirror 25 toward the microfilm 20. Mirror 26 is advanced. As is well known, the cold mirror 26 transmits heat rays and reflects light in the visible range, and prevents the microfilm 20 from becoming hot. The cold mirror 26 is held by a raised piece 27a of a chassis 27 made of a metal plate.
7a also acts as a heat sink for absorbing and dissipating the heat transmitted through the cold mirror 26, and cooperates with the cooling fan 31 to improve the heat dissipation effect.

In addition to condensing lenses 28 and 29, a pressure plate glass 30, a projection lens 32, and a trapezoidal prism 33 for changing the image attitude are attached to the chassis 27.
The pressure plate glass 30 is movable in the direction of the projection optical axis P, as is well known. When loading the cassette 12, the microfilm 20 is moved to the right by a solenoid (not shown) to facilitate insertion of the microfilm 20 into a predetermined film gate.
When in use, it is pressed onto the microfilm 20 to prevent the microfilm 20 from wobbling in the optical axis direction. Furthermore, the projection lens 32 can be moved forward and backward along the projection optical axis P for focus adjustment. The trapezoidal prism 33 has the function of inverting the left and right sides of the image taken on the microfilm 20 so that it can be viewed as a correct image on the screen 5. and,
The reproduced light beam passing through the photographic lens 32 and the trapezoidal prism 33 is reflected by a mirror 35 that bends the projection optical axis in order to extend the optical path length, and is then reflected onto the screen 5.
The image will be projected onto the back of the Note that this trapezoidal prism 33 can be omitted if the image is photographed on the microfilm 20 in consideration of the image orientation on the screen 5. Furthermore, if the trapezoidal prism 33 is made rotatable about the projection optical axis P, the image of the microfilm 20 can be transferred to the screen 5.
When projecting images onto a computer, the orientation of the projected image can be changed arbitrarily.

The mirror 35 is supported by a mirror frame 37 via a mirror holding plate 36 bonded to its back surface. A leaf spring 38 is interposed between the mirror frame 37 and the front surface of the mirror 35, and the mirror 35 is fixed to the mirror frame 37 by tightening a screw 39 screwed into the rear surface of the mirror frame 37. The tilt can be adjusted. A side plate 40 is fixed to the inner surface of the reader body 1, and a pin 4 protruding from the mirror frame 37 is inserted into a straight groove 41 formed in the side plate 40.
2 are engaged. A spring 43 is placed between the pin 42 and the side plate 40, urging the pin 42 to the right. Also, mirror frame 3
A mirror arm 47 whose one end is pivoted to the shaft 45 of the side plate 40 is pivoted to the other end of the mirror arm 7 .

The mirror arm 47 has a long hole 48 and a notch 4.
9. A cam groove 50 is formed. A pin 53 embedded in the other end of a screen arm 52 whose one end is pivoted to the screen frame 7 is engaged with the cam groove 50 . A spring 55 is hung between this pin 53 and a shaft 54 that pivots the mirror frame 37 and mirror arm 47, and biases the screen arm 52 counterclockwise around the shaft 56. , and urges the mirror frame 37 counterclockwise around the shaft 42. Further, a guide groove 58 is formed on the inner surface of the side plate 2a of the upper lid 2, and the lower part thereof is a wide portion 58a. The screen frame 7 is connected to the side plate 40 by a shaft 60.
A pin 61 protruding from the tip of the screen frame 7 connects to the guide groove 5.
8 is engaged.

When the screen is to be folded after use, the screen frame 7 is first pushed and rotated clockwise around the shaft 60.
Since the pin 53 at the tip of the screen frame 7 is guided by the inclined portion 50a of the cam groove 50, the screen arm 52 starts moving smoothly and moves down while rotating clockwise around the shaft 56 against the bias of the spring 55. At this time, the top cover 2 is lifted slightly in the opening direction. By further pushing down the screen frame 7, the screen arm 52 rotates clockwise to a position where the pin 53 abuts against the end of the straight portion 50b of the cam groove, and the screen frame 7 is folded up. During this time, the pin 61 of the screen frame 7 moves along the guide groove 58, so that the top cover 2 gradually closes in conjunction with the collapse of the screen frame 7.

Then, after the pin 53 reaches the end of the linear portion 50b of the cam groove, when the screen frame 7 is further pushed down, the mirror arm 47 is pushed down by the edge of the screen frame 7, and the mirror arm 47 is pushed down by the edge of the screen frame 7.
is now rotated clockwise about the shaft 45. The tip of the mirror arm 47 is pivoted to the mirror frame 37 via a shaft 54, and is further attached to the mirror frame 37.
Since the protruding pin 42 engages with the straight groove 41 of the side plate 40, the mirror arm 4
7 rotates clockwise, the mirror frame 3
7 rotates clockwise around the pin 42 while sliding to the left against the bias of the spring 43. Furthermore, as will be described later, the plurality of light shielding plates 8 that are pivotally attached to the shaft 60 are also folded in conjunction with the collapse of the screen frame 7.

In this way, by pushing down the screen frame 7, the mirror 35, top lid 2, and light shielding plate 8 are folded, but as shown by the two-dot chain line in FIG. When the wide portion 58a of the groove 58 is reached, the interlock between the lowering of the screen frame 7 and the closing of the top cover 2 is interrupted. At this point, while holding down the screen frame 7 with one hand,
When the top lid 2 is pushed down with the other hand, the pin 61 of the screen frame 7 is pushed by the upper edge of the wide part 58a, so the screen frame 7 is also brought down as the top lid 2 is closed. by mirror 3
5 will also be folded so as to fit under the screen 7. When the upper cover 2 is completely lowered to the closed position, the hook 4 (FIG. 1) is engaged with a locking hole formed in a required portion of the reader body 1, and is folded as shown in FIG. 7. In addition, in FIG. 7, the light shielding plate 8, springs 43, 55, etc. are omitted in order to prevent the drawing from becoming complicated. By folding the screen 5 and mirror 35 in this way,
The outer shape of the microfilm reader becomes a thin box shape as shown in FIG.

When raising the lid 2 from the state shown in FIG. 52, the screen frame 7 rises toward the use position shown in FIG. In addition, springs 43, 55
The above-mentioned standing up operation can be automated by increasing the urging force of the screen 5 and the mirror 35.
It is preferable to use the biasing forces of the springs 43 and 55 as an auxiliary aid. Then, lift the screen frame 7 by hand and insert the pin 53 into the inclined portion 50a of the cam groove 50.
By abutting the terminal end of the screen 5
and mirror 35 are set in the operating condition shown in FIG.

Note that numerals 70 and 71 indicate a power supply unit and a control unit, respectively. The power supply unit 70 includes an AC-DC converter, a voltage stabilization circuit, etc., and also includes a plug 7 for supplying AC power.
It has two sockets 73. The control unit 71 also controls the feeding of the microfilm 20,
It includes a control circuit for controlling the drive of a motor for rewinding, counting the number of film frames, and searching for a predetermined frame.

By the way, in order to block light on both sides behind the screen 5 when the screen 5 is stood up,
As shown in FIG. 2, a plurality of light shielding plates 8 are used. This light shielding plate 8 has five blades 8a, 8b, 8c, 8d, 8e as shown in FIG.
It consists of These blades 8a-8
e is pivotally attached to a shaft 60 of the screen frame 7, and when the screen 5 is stood up, the leader is arranged so that the blade 8e closest to the screen 5 is the shortest and the blade 8a closest to the leader body 1 is the longest. They are formed longer in the order closer to the main body 1.

Arc-shaped slots 75a-75e are formed at the distal end of each of the blades 8a-8e.
A pin 76 protruding from the leader body 1 is engaged with the slot 75a of the blade 8a.
Further, a pin 77a protruding from the blade 8a is provided in the slot 75b, and a pin 77a protruding from the blade 8a is provided in the slot 75c.
A pin 77b protruding from the blade 8c is engaged with the slot 75d, a pin 77d protruding from the blade 8d is engaged with the slot 75e, respectively. The uppermost blade 8e is fixed to the screen frame 7 with screws 80 through a bent portion 78 formed at its upper end. Furthermore, the back surface of the screen 5 is held by this bent portion 78, and as a result, the screen 5
and the blade 8e are both integrated with the screen frame 7 by screws 80.

A pin 81 that engages with the elongated hole 48 of the mirror arm 47 is attached to the lower edge of the blade 8a.
Pins 82 that engage with the notches 49 of the mirror arm 47 are protruded from the lower edges of the mirror arms 47, respectively. These pins 81 and 82 function to restrict the movement of the blades 8a and 8b when the screen frame 7 is laid down and the light shielding plates 8 are stored in an overlapping manner. That is, the blades 8a,
8b until the mirror arm 47 is lowered.
The blades 8c to 8d are held in the position shown in FIG. 8 by the pins 81 and 82, and during this time the blades 8c to 8d are rotated by free fall. Therefore, at the beginning of the fall of the screen frame 7, the longer blades 8a, 8b
This is effective in preventing accidents such as the intrusion of foreign objects and pinching of fingers, as this eliminates the possibility of a gap being formed at the lower edge of the side plate 2a of the upper lid 2 due to the rotation of the lid.

If the blades 8a to 8e are connected by pins and slots in this way, the blades 8a to 8e will be pulled out in sequence as the screen frame 7 rises, and the adjacent blades will be partially separated from each other. Since they overlap, a reliable light blocking function can be obtained. Furthermore, when not in use, it can be stored in a thin space, which is very convenient for making the microfilm reader compact.

According to the microfilm reader configured as described above, when in use, the mirror 35 is automatically raised to the use position in conjunction with raising the screen frame 7, and the rear surface of the screen 5 is shielded from light. The light shielding plate 8 also moves to a predetermined position. Since the screen 5 and the mirror 35 are connected via the link mechanism, the mirror 35 is positioned as well as the screen 5. Furthermore, when storing the screen frame 7, the mirror 35 falls under the screen 5 and the light shielding plate 8 is also folded compactly.

[Effect of idea]

As described above, according to the portable microfilm reader of the present invention, three parts are attached to the frame: a frame that holds the screen, a mirror frame that holds the mirror, and a lid that covers the screen when not in use. Connected by a screen arm having one end pivoted, and a mirror arm having one end pivoted to the reader body and having a cam groove in the middle with which the other end of the screen arm engages,
In addition, the mirror frame is not only rotatable but also slidable along the groove formed in the reader body, and the mirror frame is biased toward the use position by the first and second springs. because there is,
The operation when raising the screen toward the use position is easy, and the mirror can be rotated smoothly and stably in conjunction with the operation to raise the screen, thereby greatly improving the operability.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an embodiment of the present invention when not in use. FIG. 2 is an external perspective view showing an example of the present invention in use. Figure 3 A, B
2A and 2B are perspective views of the cassette with the guard panel closed and opened, respectively; FIG. FIG. 4 is a perspective view of the cassette holder in a popped-up state. FIG. 5 is a sectional view of essential parts showing a projection optical system and a structure for raising and lowering a screen in an embodiment of the present invention. FIG. 6 is a fragmentary plan view of essential parts of an embodiment of the present invention. FIG. 7 is a sectional view of a main part showing a state in which the screen is laid down. FIG. 8 is a side view of main parts showing a state in which the light shielding plate is opened. 1...Reader body, 2...Top lid, 5...Screen, 7...Screen frame, 8...Shading plate, 10
... Keyboard, 12 ... Cassette, 24 ... Lamp, 26 ... Cold mirror, 32 ... Projection lens, 35 ... Mirror, 37 ... Mirror frame, 40
...Side plate, 47...Mirror arm, 52...Screen arm.

Claims (1)

[Claims for Utility Model Registration] A screen on which a reproduced image is projected and a mirror for bending the projection optical axis are rotatably incorporated into the reader body, and are rotated to a storage position by a lid when not in use. In a portable microfilm reader that covers a screen and a mirror, the frame body holds the screen and has one end pivoted to the reader body and the other end engaged with a guide groove formed in the lid body; A mirror frame that holds the mirror and has an engaging part that is slidably fitted into a groove formed in the reader body and is rotatable around the engaging part, one end of which is pivoted to the reader body and the other end of which is attached to the reader body. A mirror arm that is pivoted to the upper end of the mirror frame and has a cam groove formed in its middle portion; a screen arm that has one end pivoted to the frame and the other end engaged with the cam groove; and a screen arm. a first spring that urges the other end of the mirror arm toward the other end of the mirror arm; and a first spring that urges the other end of the mirror arm toward the other end of the mirror arm, and the mirror frame is slid to a use position in which an engaging portion of the mirror frame is brought into contact with one end of the groove. The lid is opened in conjunction with the rotation of the frame, and the rotation of the frame also rotates the mirror arm toward the use position via the screen arm. A portable microfilm reader characterized in that the mirror is positioned at a use position by restricting the rotation of the mirror arm by bringing the other end of the screen arm into contact with the terminal end of the cam groove.