JPH06250287A - Picture projector - Google Patents

Abstract

PURPOSE:To provide an easy-to-see screen capable of making its angle perpendicular to the line of sight of a scanner by providing this picture projector so as to be able to adjust the inclined angle of the screen. CONSTITUTION:A nearly horizontal table 2 is provided on the top part of the pedestal 1 of a microfilm reader printer. A machine box 18 is provided on the top surface of the table 2. The machine box 18 has the screen 8, a screen frame 9 holding the screen 8 and a mirror. The screen frame 9 can be vertically rotated with respect to the machine box 18 by a knob 26 restrained on the screen frame 9 and the knob 26 is operated to turn so that the inclined angle of the screen 8 can be changed. The variable angle range of the screen 8 can be easily set by changing the position of a stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image projection device such as a microfilm reader and a microfilm reader printer.

[0002]

2. Description of the Related Art In conventional microfilm readers and reader printers, the screen of the reader is generally arranged in a substantially vertical plane with the angle fixed in advance to the main body of the apparatus, and the angle cannot be changed. there were.

[0003]

Therefore, when observing / reading the image information projected on the screen, depending on the person, the line-of-sight of the screen may be different due to the standing height of the device, the height of the sitting chair, the sitting height, etc. The projection image becomes difficult to see because the screen surface is viewed at an obliquely upward (elevation angle) or obliquely downward (depression angle) line of sight rather than at right angles to the surface.

In addition, even in a situation where indoor illumination light such as a fluorescent lamp or incident external light from a window is reflected on the screen surface and just enters the screen surface and the projected image on the screen surface is difficult to see, the screen angle is changed. No adjustment could be made to avoid the reflected light from entering the eye.

An object of the present invention is to solve the above problems.

[0006]

The present invention is an image projection apparatus characterized by the following configurations. (1) An image projecting device, wherein a device for projecting an image of a film on a screen is configured so that a tilt angle of the screen can be adjusted. (2) A reader unit for projecting the image of the film on the screen and a printer unit for projecting the image on the photoconductor,
An image projection apparatus comprising an operation member for adjusting a screen tilt angle. (3) An image projection apparatus characterized in that the illumination light amount of the film is changed according to the tilt angle of the screen. (4) An image projection device, characterized in that a light blocking member for restricting external light incident on the screen is provided. (5) An image projection apparatus, wherein the light shielding member is moved according to the inclination of the screen. (6) An image projection apparatus, wherein an index indicating a printable area in the printer unit is projected on a screen.

[0007]

Since the screen is rotatable, the angle of the screen can be adjusted so that the screen surface is in a relational attitude at right angles to the line of sight so that the projected image is easy to see.
Also, the angle of the screen can be adjusted so as to avoid the outside light reflected on the screen surface from entering the eyes.

[0008]

1 to 3 are schematic configuration diagrams of a microfilm reader printer as a first embodiment of an image projection apparatus of the present invention.

In FIGS. 1 and 2, reference numeral 1 denotes a wagon-shaped base as an apparatus main body, and a substantially horizontal table 2 is provided on the upper part of the base 1.

A partition wall 3 is provided on the lower surface of the table 2, and is located between the table 2 and the partition wall 3 and in front of the base 1.
That is, the light source lamp 4 is provided on the left side in the figure. A condenser lens 5 is provided on the table 2, and a microfish carrier 6 and an imaging lens 7 are provided on the table.

On the other hand, a machine box 18 is provided on the upper surface of the table 2, and the machine box 18 has a screen 8, a screen frame 9 for holding the screen 8, and mirrors 10-14. As shown in FIG. 3, the screen frame 9 can be vertically rotated with respect to the machine box 18 by a knob 26 that is locked to the screen frame 9. By rotating the knob 26, the screen frame 9 is inserted. The screen 8 is rotated up and down to change the angle of inclination of the screen surface. The knob 26 is rotatably provided on the machine box 18, and when the knob 26 stops rotating, the screen frame 9 stops rotating, and the screen 8 is held at the adjusted tilt position.

In the table 2, a slit 15 is provided below the mirror 13, and a process cartridge 16 as a printer section is provided below the slit 15. The process cartridge 16 contains a photosensitive drum 16A, a charger 16B, a developing device 16C, a cleaning device, etc., and the process cartridge 16 is removable.

Below the process cartridge 16, a sheet conveying section 17 is provided. On the sheet conveying section 17, a sheet feeding cassette 19 accommodating a transfer sheet P is detachably provided, and a sheet feeding roller 20, U-turn transport path 21,
Registration roller pair 22, transfer charger 23, fixing roller 2
4 is provided. A sheet discharge tray 25 is provided below the partition wall 3 and on the front side of the sheet conveying unit 17.

In the above configuration, in the reader mode, a desired image frame portion in the microfiche (not shown) set on the carrier 6 is positioned above the condenser lens 5.

The search image frame portion is illuminated from below by the light source lamp 4, and the transmitted light of the image frame of the illumination light is reflected by the mirrors 10 and 14 through the imaging lens 7, and the image information of the image frame is displayed on the screen 8. Is magnified, image-projected, and read from the outer surface side of the screen 8.

On the other hand, in the print mode, when a copy key (not shown) is pressed, the light entering the machine box 18 from the imaging lens 7 is sequentially reflected by the mirrors 10, 11, 12, 13 in the machine box 18. From the slit 15 to the photosensitive drum 16A, an enlarged image of image information of an image frame is image-projected (slit scanning exposure).

On the other hand, in synchronization with the above operation, the transfer paper P is conveyed below the process cartridge 16 through the U-turn carrying path 21 and the image is transferred. The sheet P that has received the image transfer passes through the fixing roller 24, undergoes image fixing, and is discharged and stacked on the discharge tray 25.

In the reader mode, the knob 26
By turning, it is possible to change the screen surface to an angle that is easy to see, depending on the position of the user, the brightness of the surroundings, and the like. FIG. 1 shows a state in which the screen faces upward, and FIG. 2 shows a state in which the screen faces downward.

The variable angle range of the screen can be easily set by changing the position of a stopper (not shown).

Next, a second embodiment of the present invention will be described.

In the first embodiment, when the screen surface is tilted upward, external light such as a fluorescent lamp is reflected on the screen surface, which makes it difficult to see the projected image.

Therefore, in this embodiment, when the screen is tilted upward, the amount of illumination light is increased so that the screen is bright and easy to see.

FIG. 4 is a side sectional view of a microfilm reader printer showing a second embodiment of the present invention. The same elements as those in the first embodiment are designated by the same reference numerals, and only the portions different from the first embodiment will be described. To do.

In FIG. 4, 9a is a light shielding plate provided on the screen frame 9, and 31 is a photo interrupter for detecting the position of the light shielding plate 9a.

The light shielding plate 9a rotates integrally with the screen frame 9, and the photo interrupter 31 detects the rotation position of the light shielding plate 9a and outputs a signal corresponding to the rotation position. The output signal of the photo interrupter 31 is sent to the angle detection circuit 501, and the angle detection circuit 50 detects the tilt angle of the screen 8. The data of the screen inclination angle detected by the angle detection circuit 50 is sent to the light amount control circuit 51, and the lamp 4 is adjusted by the light amount control circuit 51 to a light emission amount according to the screen inclination angle.

The light amount control circuit 51 improves the contrast of the projected image by increasing the light emission amount and making the screen surface brighter as the screen 8 tilts upward as shown in FIG. 1, as shown in FIG. As the screen tilts downward, the amount of light emission is reduced to darken the screen surface, and the amount of light emission of the lamp is adjusted so that a projected image with an appropriate contrast can always be read depending on the angle of inclination of the screen.

Next, a third embodiment of the present invention will be described.

In the case of the method of increasing the amount of illumination light so that the projected image on the screen surface can be easily seen as in the second embodiment, there is a drawback that the power consumption becomes large and the life of the light source lamp is shortened.

Therefore, in the present embodiment, when the screen is tilted upward, the light shielding member is projected toward the front side at a position above the screen so as to block the outside light from entering the screen surface. Is.

5 and 6 show a microfilm reader printer showing a third embodiment of the present invention. The same elements as those in the above embodiment are designated by the same reference numerals, and only the portions different from the above embodiment will be described. .

In FIGS. 5 and 6, reference numeral 9b is a gear provided on the screen frame 9 and having a pivot fulcrum S of the screen frame 9 as a center, 35 is a light-shielding member coming in and out from the groove 18a of the machine case 18, and 36 is a pinion gear. Is. This pinion gear 36
Is engaged with the rack 35a provided on the light blocking member 35 and the gear 9b of the screen frame 9,
Moves in synchronization with the rotation of the screen frame 9 in the groove 1 of the machine box 18.
It comes in and out from 8a.

Therefore, when the screen frame 9 rotates in the clockwise direction, the light shielding member 35 gradually projects from the machine box 18 in conjunction with the rotation of the screen frame 9.

On the other hand, when the screen frame 9 rotates counterclockwise, the light shielding member 35 interlocks with the rotation of the screen frame 9 and gradually returns to the inside of the machine box 18.

With the above construction, when the screen surface is tilted upward, the light-shielding member can be projected forward to block external light from entering the screen surface, resulting in a very easy-to-see screen.

In this embodiment, the light blocking member is gradually operated in association with the rotation of the screen. However, when the screen surface is tilted upward from a predetermined angle, the light blocking member is instantaneously projected to A configuration may be adopted in which the light blocking member is instantaneously retracted when the surface is tilted below a predetermined angle.

Next, a fourth embodiment of the present invention will be described.

In the above embodiment, if the screen 8 is set at a position where the optical axis and the screen surface are not orthogonal to each other as shown in FIG.
The projection magnification varies depending on the location of the screen, and the projected image will be distorted. FIG. 8 is a diagram showing a distorted state of the projected image at that time. In FIG. 8, 42 is a key frame as an index showing the print range, and the projected image is a printed image when the screen surface and the optical axis are orthogonal to each other. It shows the effective print range when obtaining as. Reference numeral 43 denotes a print effective range when the projection image is obtained as a print image when the optical axis and the screen surface intersect as shown in FIG.

As shown in the figure, in the above embodiment, when the angle of the screen surface is changed, the print effective range of the projected image changes accordingly, so that it becomes difficult for the operator to accurately recognize the print effective range.

Therefore, in this embodiment, by disposing a member for projecting and displaying the key frame on the screen in the projection optical path of the film original image, the distortion amount of the film original image projected image and the distortion of the key frame projected image on the screen. The quantities are made to match.

FIG. 7 is a side sectional view of a microfilm reader printer showing a fourth embodiment of the present invention. The same elements as those in the above-mentioned embodiment are designated by the same reference numerals, and only the portions different from the above-mentioned embodiment will be explained. To do.

In the figure, reference numeral 41 denotes a projection member made of a transparent material such as a film sheet or glass, which is arranged in the vicinity of the screen 8 on the optical path R of the original image of the original film so as to be orthogonal to the optical axis R of the original image of the original film image. It is arranged. As shown in FIG. 9, the projection member 41 is provided with non-transparent or translucent key frames 41a to 41d, and the key frames 41a to 41d.
41d coincides with the print effective range of the original film projection image of the film on the arrangement surface of the projection member 41.

With the above configuration, the original film projection image and the projection images of the key frames 41a to 41d are combined and projected on the screen 8, so that the screen 8 is set at a position where the optical axis R and the screen 8 are not orthogonal. Also, as shown in FIG. 10, the projected image of the original film and the projected images 41a 'to 41 of the key frame are formed.
Since d'is projected and displayed on the screen 8 with the same distortion, the operator can see the projected images 41a 'to 41d' of the key frame.
Therefore, the print effective range 43 of the projection image of the original film image can be easily recognized.

In this embodiment, the projection member 41 is arranged near the screen, but in order to enhance the resolution of the key frame,
It is preferably placed near the screen.

However, the arrangement of the projection member 41 can be easily changed by separately providing an optical path for projecting the key frame in addition to the projection optical path of the original film image.

Further, in this embodiment, the key frames fixedly arranged near the screen are projected, but the key frames may be moved in accordance with the distortion of the projected image of the original film. At that time, the key frame may be provided on the screen or at a place other than the screen.

[0046]

As described above, since the operator's line of sight can be made perpendicular to the screen by considering the angle of the screen surface, the screen is very easy to see.

When the screen surface is tilted upward, 1. The amount of illumination light is increased to reduce the reflection of external light on the screen surface, making it difficult to see the projected image, and to prevent the external light from entering the screen surface by projecting the light shielding member forward above the screen. This makes the screen very easy to see.

Further, even if the projection image of the film original image is distorted by synthesizing the projection image of the key frame showing the printing effective range and the projection image of the film original image and projecting it on the screen, the operator correctly confirms the printing effective range. it can.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a microfilm reader printer as an example of an image projection apparatus of the present invention.

FIG. 2 is a schematic configuration diagram showing a state in which a screen is rotated.

FIG. 3 is an external perspective view thereof.

FIG. 4 is a schematic configuration diagram of a second embodiment.

FIG. 5 is a schematic configuration diagram of a third embodiment.

FIG. 6 is a sectional view showing an interlocking mechanism of a third embodiment.

FIG. 7 is a schematic configuration diagram of a fourth embodiment.

FIG. 8 is a diagram illustrating a projected image.

FIG. 9 is a front view of a projection member.

FIG. 10 is a diagram illustrating a projected state of a key frame.

[Explanation of symbols]

 4 lamps 8 screen 9 screen frame 26 knob

Claims (6)

[Claims] 1. An apparatus for projecting a film image on a screen, wherein the tilt angle of the screen is adjustable. 2. An image projection comprising a reader unit for projecting an image of a film on a screen, a printer unit for projecting the image on a photoconductor, and an operation member for adjusting an inclination angle of the screen. apparatus. 3. The image projection apparatus according to claim 1, wherein the illumination light amount of the film is changed according to the inclination angle of the screen. 4. The image projection apparatus according to claim 1, further comprising a light blocking member for restricting external light incident on the screen. 5. The image projection apparatus according to claim 4, wherein the light shielding member is moved according to the inclination angle of the screen. 6. The image projection apparatus according to claim 2, wherein an index indicating a printable area of the printer unit is projected on a screen.