JPH0719026B2 - Image projection device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an image projection device capable of projecting information on an information recording medium such as a microfilm onto a screen.

(Prior Art) Conventionally, in this type of apparatus, when projecting an image on a microfilm, the film is closely held between holding glasses by using a mechanism as shown in FIG. It is known to employ a configuration for preventing one-sided blurring (partial defocusing) of an image.

That is, in this apparatus, cylindrical glass support rods 101a and 101b are attached to the pressing glass 100, and the glass support rods 101a and 101b are placed in the recesses of the support members 102a and 102b arranged in parallel with each other. Place the glass 100 in the arrow
It is rotatable in the X ₁ and X ₂ directions.

On the other hand, each support member 102a, 102b is a spring 1 fixed to the main body of the device.
It is connected to 03a, 103b and pulled in the direction of arrow Y,
Since the support members 102a and 102b are rotatably attached to the 104, the support members 102a and 102b can individually swing (arrows Z ₁ , Z ₂ or R ₁ , R ₂ directions).

As described above, by pressing the glass 100, which should hold the fill, against the fixed glass on the upper side with the freedom shown in FIG. 6 by the mechanism shown in FIG. 6, the microfilm can be brought into close contact with the fixed glass. It will be possible.

(Problems to be Solved by the Invention) However, in such a conventional example, since the glass 100 is pressed against the fixed glass by using a complicated mechanism as shown in FIG. 6, a pressing defect is likely to occur. Also, there is a problem that the cost becomes high because of the large number of parts.

Furthermore, when the tensions of the springs 103a and 103b are different due to variations in parts, etc., the pressing force of the glass 100 is not uniform, so that the film is not completely adhered to the fixed glass, and the above-mentioned projected image piece on the screen It also had the problem of blurring.

Therefore, the present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to reliably place the information recording medium at the reference position with a simple configuration when projecting an image on the screen. It is to provide a fixed information retrieval device.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, an information recording medium having an image frame to be searched is sandwiched between a pair of holding members, and the holding member for pressing among the holding members. In the image projection apparatus that presses the positioning holding member to hold the information recording medium at the reference position on the image projection optical path, the pressing holding member presses the information recording medium to the positioning holding member, and Is rotatably supported at a position for releasing the pressing holding member, and the pressing holding member is abutted against a part of the surface of the pressing holding member opposite to the surface facing the information recording medium to press the pressing holding member. It is characterized in that it is held at the pressing position.

(Operation) In the present invention having the above configuration, the information recording medium is sandwiched between the pressing and positioning holding members and the pressing holding member is pressed against the positioning holding member, thereby It is brought into close contact with the position holding member. In this case, since the pressing holding member is supported at one point, the degree of freedom in the pressing direction is large, and the information recording medium can be pressed uniformly against the surface of the positioning holding member.

(Example) Hereinafter, the present invention will be described based on illustrated examples.

FIG. 1 shows a schematic configuration of an embodiment of an image projection apparatus according to the present invention. In FIG. 1, F is a microfilm as an information recording medium on which a frame image is recorded, which is accommodated in the cartridge 1 in a roll shape. The film F is derived from the cartridge 1 and the information is searched for as follows. That is, first, when the cartridge 1 is set at a predetermined position, the drive pulley 2 and the separation pulley 3 move to the illustrated positions. The drive pulley 2 is wound around the conveyor belt 4 and is connected to a motor (not shown) so as to rotate in the direction of arrow A.
Rotation causes the transport belt 4 to move in the direction of arrow B and rotate the film F in the direction of arrow C.

On the other hand, the separation pulley 3 is rotated in the direction of arrow D, and the separation / conveyance belt 5 is moved in the direction of arrow E to separate the leading end of the film F from the roll and guide it in the direction of the guide 6. Here, when the leading edge of the film F passes near the roller 7, the fact is detected by a detecting means (not shown),
The roller F is lowered downward to press the film F against the separation / conveyance belt 5, so that the film F can be smoothly taken out.

The film F drawn out of the cartridge 1 in this way reaches the reel 13 through the transport path formed by the guides 6, 8, the pulleys 9, 10 and the glasses 11 and 12 as holding members, and reaches the reel 13. Wound up by.

Next, by rotating the film F and the reel 13 in the cartridge 1, the film F is moved in the direction of the arrow G ₁ or G ₂ , and further, the movement is performed so that the target frame is located between the glasses 11 and 12. Stop.

Then, the film F located between the glasses 11 and 12 is attached to the lens 1
A lamp 15 is used to certify the image light, and the image light is projected on the screen S via a mirror 16.

By the way, in this type of apparatus, usually, in order to prevent an image from being out of focus (partly out of focus) on the screen S when the image on the film F is projected, the lens of the glasses 11 and 12 is used. Glass 12 located on side 14
Is pressed against the fixed glass 11 on the mirror 16 side to bring the film F into close contact with the glass 11.

In this case, in order to press the pressing glass 12 against the fixed glass 11 with a force as uniform as possible, a complicated mechanism is used in the conventional example, but the pressing glass 12 is still pressed against the fixed glass 11 uniformly. This is difficult, and in addition, problems such as poor pressing and increased cost have occurred.

Therefore, in this embodiment, the film F is surely brought into close contact with the fixed glass 11 by a simple mechanism as described below.

FIG. 2 is a perspective view of the pressing glass 12 of this embodiment as viewed from the back side. As shown in the figure, on the lower surface of the pressing glass 12, a supporting member 17 having an area about half that of the glass 12 is attached, and a convex portion 17a extending in the longitudinal direction of the pressing glass 12 is provided at the center thereof. It is provided. Further, projections 17b for glass are provided on both sides of the support member 17.

3 (a), (b), and (c) show the pressing mechanism for the glass 12 in this embodiment. That is, an arm 18 for moving the pressing glass 12 is provided below the pressing glass 12.
Is rotatably supported by supporting portions 19 provided on both sides of the glass 12, and is connected to a solenoid SL via a connecting member 20. This arm 18 is a convex portion 17 of the support member 17.
Arranged in a direction orthogonal to a, the driving portion 18a is formed below the pressing glass 12 by being bent in a substantially U-shape, and the driving portion 18a comes into contact with the convex portion 17a at one point. There is. Further, the extension portion 18b of the arm 18 is bent stepwise, and the drive portion 18a and the extension portion 18b are arranged in a predetermined rotational direction about the longitudinal direction of the arm 18 as shown in FIG. 3 (b). The drive portion 18a is bent at the corners of and is moved by a slight movement of the extension portion 18b driven by the solenoid SL so that the drive portion 18a abuts on the convex portion 17a. In this case, in order to press the pressing glass 12 against the fixed glass 11 with a uniform force, it is desirable to bring the convex portion 17a into contact with the arm 18 near the center of gravity of the pressing glass 12 and the supporting member 17.

Incidentally, as shown in FIG. 3 (c), the projection 17b provided on the support member 17 is fitted in the groove 20 of this example, and the upper surface of the glass 12 is provided to smooth the movement of the film F when pressed. A spacer member 21 is provided.

In the above configuration, the solenoid SL is energized and the arm is energized.
When the extended portion 18b of 18 is pulled in the direction of arrow H, its drive portion 18a rotates in the direction of arrow I and comes into contact with the convex portion 17a of the support member 17 at one point, pushing up the pressing glass 12 upward and fixing it to the fixed glass 11. Press. In this case, since the pressing glass 12 receives a driving force from one point of the arm 18, the pressing glass 12 has a large degree of freedom.
It is possible to reliably press 12 along the contact surface of the fixed glass 11. Therefore, the film F can be held in close contact with the fixed glass 11 serving as a reference during image projection,
So-called image blurring can be prevented.

Further, since the present embodiment is mechanically simpler than the conventional example, it is less likely that a pressing failure will occur, and the number of parts is small, so that the cost can be reduced.

The mechanism for supporting the pressing glass 12 at one point and pressing it against the fixed glass 11 is not limited to the above embodiment. That is, in the following description, the same parts as those in the above-mentioned embodiment are designated by the same reference numerals and will be described. As shown in FIG.
The convex portion 30 may be provided on the 18a and the convex portion 30 may be brought into contact with a flat plate-shaped support portion 31 provided on the lower surface of the pressing glass 12. In this case, there is an effect that it is not necessary to process the pressing glass 12 side.

Further, as shown in FIG. 5, one end of an elongated arm 41 rotatable about a shaft 40 is connected to a solenoid SL, and a convex portion 42 provided at the other end is provided on the lower surface of the pressing glass 12. Abut,
It is also possible to transmit the driving force of the solenoid SL to the pressing glass 12 at one point to drive it. In this case, there is an effect that the structure of the pressing mechanism is further simplified and the cost can be reduced.

(Advantages of the Invention) In the present invention having the above-described configuration and operation, the pressing member is pressed by abutting against a part of the surface of the pressing holding member opposite to the surface facing the information recording medium. Since the holding member for holding is held at the pressing position, the information recording medium can be pressed uniformly and can be surely brought into close contact with the holding member for positioning, and as a result, so-called one-sided blur at the time of image projection can be prevented. You can

Further, since the pressing holding member may be supported by a part,
The pressing mechanism can be simplified, and it is possible to reduce the cost as well as to prevent defective pressing.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the image projection apparatus according to the present invention, FIG. 2 is a perspective view of the pressing glass of the embodiment seen from the back side, and FIGS. 3 (a) to 3 (c) are The pressing mechanism of the pressing glass in the embodiment is shown in FIG. 4 (a), which is a schematic front view, FIG. 4 (b) is a schematic left side view, FIG. 4 (c) is a perspective view, and FIG. FIG. 5 is a perspective view showing a pressing mechanism of a pressing glass according to another embodiment of the present invention, FIG. 5 is a perspective view showing a pressing mechanism of a pressing glass according to still another embodiment of the present invention, and FIG. FIG. 3 is a perspective view showing a pressing mechanism for pressing glass in the projection device. Explanation of code 11 …… Fixed glass (holding member for positioning) 12 …… Pressing glass (holding member for pressing) 17 …… Support member, 17a …… Convex section 18 …… Arm, 18a …… Drive section 18b …… Extended Part F: Microfilm (information recording medium) SL: Solenoid

Claims (1)

[Claims] 1. An information recording medium having an image frame to be searched is sandwiched between a pair of holding members, and a pressing holding member of the holding members is pressed against a positioning holding member to bring the information recording medium on an image projection optical path. In the image projecting device for holding the information recording medium at the reference position, the pressing holding member is rotatably supported at a position for pressing the information recording medium against the positioning holding member and a position for releasing the pressing, and the pressing holding member. 2. An image projection apparatus, wherein the pressing holding member is held at the pressing position by abutting a pressing member on a part of the surface opposite to the surface facing the information recording medium and pressing the same.