JPH08201915A - Information processor - Google Patents

Abstract

PURPOSE: To excellently correct the deviation of an optical axis by the small number of parts by controlling an optical member for correcting an image position according to the rotational angle of an optical member for rotating an image and correcting the positional deviation of an image projected on a screen surface. CONSTITUTION: A relation table between the rotational angle and the deviation value of the optical axis of a prism 7 are previously inputted and stored in a control circuit 20. By the control circuit 20, the deviation value of the optical axis of the prism 7 at the rotational angle is calculated based on the data of the rotational angle of the prism from photoencoders 25 and 26. Besides, the driving panel motors 14 and 15 of cams 14a and 15a for controlling the angle of a second mirror 9 being as the optical member for correcting an image position are rotated by the prescribed calculated angle in such a direction that the positional deviation of the image projected on the screen caused by the deviation of the optical axis accompanied with the rotation of the prism 7 is corrected. That means, the angle of the mirror 9 is controlled to be changed by the prescribed angle in such a direction that the positional deviation of the image projected on the screen caused by the deviation of the optical axis is corrected according to the rotational angle of the prism 7 in connection with the rotating operation of the prism 7 being as the optical member for rotating an image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image rotation optical member for correcting image position of image light of image information on an information recording medium such as a microfilm such as a microfilm reader / reader printer. The projection means including an optical member projects an image on the screen (reader screen / monitor screen) so that it can be viewed and read, and the position of the projected image on the screen surface is corrected by rotating the image rotation optical member to correct the image position. The present invention relates to an information processing apparatus capable of correcting the position of a projected image on a screen surface by controlling a use optical member.

Further, the present invention relates to an information processing apparatus having a recording function of guiding the image light to the printing means section or the reading means section via the projection means to record image information.

[0003]

2. Description of the Related Art A microfilm reader printer will be described as an example.

Conventionally, there is a micro film reader printer as shown in FIG. 1 is a lighting lamp, 2
Is the upper and lower parts of the light from the lamp 1 that serves as the film illuminator.
It is a condenser lens for focusing light on a platen glass (flat glass plate) 3 or 4. Platen glass 3.4
Is switched by an opening / closing mechanism (not shown) between an open state in which they are separated from each other with a predetermined gap, and a closed state in which they are pressed against each other. In the open state, the microfilm as an information recording medium between the platen glasses 3 and 4 is used. 5 is driven and driven, the target image information frame portion is searched and positioned between the platen glasses 3 and 4, and the platen glass 3 and 4 are converted to the closed state, whereby the target image information frame portion of the microfilm 5 is moved. Is pressed and held between the platen glasses 3 and 4, and flatness is obtained.

Then, the film-transmitted light (image light) of the illumination light by the illumination lamp 1 and the condenser lens 2 of the target image information frame portion of the microfilm 5 pressed and held between the platen glasses 3 and 4 is A semi-transmissive reader screen 12 is provided by a projection means (projection optical system, reader optical system) including a projection lens 6, a ladder prism 7 as an image rotation optical member, and first to fourth mirrors 8 to 11.
It is guided to the back side of the screen and is enlarged and image-projected on the screen 12, and the projected image 13 can be visually recognized and read from the front side of the screen 12 (reader mode).

When a copy of the projected image 13 is desired to be obtained, a copy button on the operation unit (not shown) is pressed to switch the apparatus to the print mode and the print mechanism 30 shown in FIG.
Is activated and copying is executed. That is, 31 and 32 are the first and second image light scanning for the print mode.
And is fixedly arranged on a support body (mirror carrier) 33 which is driven forward and backward P and Q along a guide member (not shown) so that their reflection surfaces form 90 °. The forward movement P of the support 33 causes the first scanning mirror 31 to enter the optical path between the second and third mirrors 9 and 10 of the projection means in a predetermined manner, and then the support 33 moves backward. By doing so, the image light from the second mirror 9 is scanned by the first scanning mirror 31, and the scanning light is enlarged and imaged on the surface of the rotary photosensitive drum 34 of the print mechanism 30 via the second scanning mirror 32. After projection (slit exposure), the printing mechanism 30 copies the projection image 13.

The printing mechanism 30 of this example is a copying mechanism utilizing a transfer type electrophotographic process. 34 is an electrophotographic photosensitive drum as an image carrier, 35 is a slit plate, 36 is a primary charging device, 37 is a toner developing device, 38 is a transfer device, 39 is a cleaning device, 40 is a paper feeding cassette, 41 is recording paper ( Transfer material), 42 is a paper feed roller, 43 is a registration roller pair, and 44 is a fixing device. Since the image forming principle and process of the print mechanism 30 itself are well known, the description thereof will be omitted.

A. Attitude correction means for the projected image 13 The image information photographed and recorded on the microfilm 5, which is an information recording medium, is originally tilted and photographed,
When the microfilm 5 is set on the film carrier in a tilted state, the projected image 13 on the screen 12 is also projected in a tilted state as shown in FIG. 7A and is difficult to observe and read. Further, in the print mode, an image is copied in the tilted state with respect to the recording paper surface and printed out, resulting in a miscopy.

The prism 7 as an image rotation optical member is for rotating the projected image in the tilted state to correct the posture to an erect image as shown in FIG. 7B. That is,
The prism 7 is rotatably arranged clockwise and counterclockwise around the optical axis of the projection lens 6. Reference numeral 21 is a knob for rotating the prism, and 22 is a gear integrally attached to the outer periphery of the prism 7. A gear 22 is attached to the shaft end of the knob 21.
A gear (not shown) is provided to engage with the knob 21.
When the forward / reverse operation is performed, the gear 22, that is, the prism 7 rotates in the clockwise / counterclockwise direction around the optical axis of the projection lens 6 in conjunction with the operation. When the prism 7 rotates, the projection image 13 rotates clockwise or counterclockwise on the screen 12 surface. Therefore, when the projected image 13 is projected in a tilted state as shown in FIG.
By rotating the prism 7 in the clockwise direction or the counterclockwise direction by 1 at an appropriate angle, the projected image 13 in the tilted state can be obtained without operating the film 5 or the film carrier, as shown in FIG. The image can be easily modified.

B. Position correction means for projected image 13 This is the effective image portion of the projected image (the effective area of the projected image,
The effective print area of the projected image is controlled to move to the center of the screen 12. The image position correction of the effective image portion is generally performed in the print mode.

That is, the second mirror 9 of the projection means is used as an image position correcting optical member, and the mirror 9 is swingable by the rotation of the cam 14a about one side a of the two right-angled sides and the other side. The cam 15a is arranged so as to be swingable around the side b of the center. 14 and 15 are cams 1
It is a drive device such as a pulse motor driven by 4a and 15a. The pulse motors 14 and 15 are cams 14 respectively.
By controlling the rotation of the a. 15a, the angle about the side a side of the mirror 9 and the angle about the side b side of the mirror 9 are changed respectively, and the projection image 13 on the screen 12 is displayed in the vertical direction of the screen surface. The position can be moved to the left and right.

Reference numerals 16 and 17 denote sensors such as a photo interrupter, which detect the slit plates 18 and 19 attached to the shafts of the pulse motors 14 and 15, respectively, so as to center the side a of the second mirror 9. And the home position angle with the side b as the center are detected, and the pulse motors 14 and 15 are drive-controlled based on the detected angular position, and the side a of the second mirror 9 is detected.
The angle control centered on the side and the angle control centered on the side b are performed.

A control circuit 20 receives a signal from an image area sensor (not shown) for detecting an effective image area on the screen 12, and the pulse motors 14 and 15 are based on data detected using the input signal. By rotating each of them by a predetermined calculated angle, the angle control centering on the side a side of the second mirror 9 so that the effective image portion moves to the center of the screen 12, and the angle centering on the side b side. Take control.

By the way, with respect to the posture correcting means for the projected image 13 of the a, a prism 7 as an optical member for image rotation is used.
Due to the optical characteristics, the optical axis shifts (moves the optical axis, shifts from the optical axis of the projection lens) due to the rotation operation. In general, the center of the projected image 13 on the screen 12 surface moves in a trajectory as shown in FIG. 8 due to the deviation of the optical axis of the prism. Here, the point c is the position of the center point of the projected image when the home position of the prism 7 is rotated. Point a is point c
The position of the center point of the projected image when the prism is rotated 90 ° from the above state is shown. Point b is the position of the center point of the projected image when the prism is rotated 180 ° from the state of point c.

In order to eliminate the deviation of the optical axis due to the rotation operation of the prism 7, it is conceivable to perform the optical axis deviation correction processing in consideration of the optical axis deviation due to the rotation operation at the time of manufacturing the prism.
In this case, the optical characteristics are deteriorated such as the deterioration of the resolution. In addition, the amount of optical axis deviation also changes depending on the processing accuracy during manufacturing.

Therefore, a correction means is provided in a portion other than the prism to correct the optical axis. FIG. 9 shows an example. That is, on the lower surface side of the prism rotation gear 22 integrally attached to the outer periphery of the prism 7, a downward concave-convex annular cam 22a for optical axis deviation correction is provided along the circumference of the gear 22, and this cam 22a is provided. Stationary roller (cam follower) 2
3 and 24 are brought into contact with each other, and as the prism 7 rotates, the gear 22, that is, the prism 7 is inclined by the cam 22a and the rollers 23 and 24 with respect to the optical axis of the projection lens 6 corresponding to the unevenness of the cam 22a (the prism 7 Change the angle of the projection image 13 on the screen 12 surface.
It can be moved left and right. So cam 22
The unevenness of “a” is set in advance so that the angle of the prism 7 is changed in a direction of correcting the optical axis shift caused by the rotation operation of the prism 7 due to the characteristics of the prism 7.

Although not shown here, it is also possible to correct the optical axis shift by moving the prism 7 along a rotation thereof on a plane perpendicular to the optical axis.

As a result, when the prism 7 is rotated to correct the orientation of the projection image 13, the optical axis of the prism 7 is displaced due to the rotation of the prism 7, so that the effective image extends out of the screen 12, and the print output image is displayed. It is possible to prevent chipping of the image and to improve the operability and reliability without the need to operate the film carrier to move the projected effective image to the screen again. It is like this.

[0019]

However, in the above-described conventional configuration example, in order to correct the optical axis shift due to the rotation of the prism, which occurs due to the optical characteristics of the prism 7 as the image rotation optical member. A mechanism such as a precise annular cam 22a and cam followers 23 and 24 is required as the means.

Further, the optical axis deviation caused by the rotation of the prism, which occurs due to the optical characteristics of the prism 7, greatly changes the amount of the optical axis deviation due to the accuracy in manufacturing the prism. In the case of assembling, a correction corresponding to each prism is required, which hinders productivity.

Further, a prism rotation angle detecting means is provided as a means for correcting the optical axis deviation caused by the rotation of the prism.
When the prism is moved by an electrically controlled driving method such as a pulse motor to correct the optical axis deviation, the number of parts increases, which is a problem in terms of cost.

At the same time, the above countermeasures cause a cost increase because it is necessary to use a prism having a large size so that the projected image is not chipped due to the movement.

Therefore, in the present invention, the image light of the information recording medium is image-projected on the screen surface by the projection means including the image rotation optical member and the image position correction optical member, and the rotation operation of the image rotation optical member is performed. In an information processing apparatus for correcting the attitude of a projected image on a screen surface by means of the image position correction by controlling the image position correcting optical member, an image rotating optical member according to the rotation of the image rotating optical member is used. An object is to devise a means mechanism for correcting the position shift of a projected image on the screen surface due to the optical axis shift of a member, to simplify the means mechanism, reduce cost, and improve operability and productivity. To do.

[0024]

The present invention is an information processing apparatus having the following configuration.

(1) Image light of an information recording medium is image-projected on a screen surface by a projection means including an image rotation optical member and an image position correction optical member, and the screen is rotated by rotating the image rotation optical member. In an information processing apparatus that corrects the posture of a projected image on a surface by correcting the position of the projected image on the screen surface by controlling the image position correcting optical member, the information is corrected every time the rotation angle of the image rotating optical member changes. The optical axis of the image rotation optical member is displaced in accordance with the rotation of the image rotation optical member by controlling the image position correction optical member in association with the rotation angle of the image rotation optical member in association with the rotation of the image rotation optical member. An information processing apparatus, characterized in that a positional deviation of a projected image on a screen surface due to is corrected.

(2) The information processing apparatus according to (1), which has a recording function of guiding the image light to the printing means section or the reading means section via the projection means to record an image.

(3) A means for detecting the rotation angle of the image rotation optical member is provided, and the image position correction optical member is controlled by the control means in correspondence with the detection angle information of the detection means. The information processing apparatus according to (1).

(4) A means for detecting the effective area of the projected image on the screen surface is provided, and the image position correcting optical member is controlled by the control means in correspondence with the detection position information of the detection means. The information processing device according to (1).

(5) A means for detecting the rotation angle of the image rotation optical member and a means for detecting the effective area of the projected image on the screen surface are provided, and the rotation of the image rotation optical member is performed by using both means. The information processing apparatus according to (1), which has a function of measuring the amount of deviation of the optical axis associated with the above and determining a correction amount of the optical axis deviation.

(6) The information processing apparatus according to (1), wherein the image rotation optical member is a prism.

(7) The optical member for image position correction is a mirror, and the position of the projected image on the screen surface is corrected by controlling the angular orientation of the mirror by the control means. The information processing device described.

(8) The information processing device according to (1), characterized in that the information processing device is a reader or reader printer for an information recording medium such as a microfilm.

[0033]

That is, the present invention focuses on an existing image position correcting optical member as the projection means, and projects the image on the screen surface due to the optical axis shift of the image rotating optical member accompanying the rotation of the image rotating optical member. Is also used as the position deviation correcting means, and the rotation angle of the image rotation optical member is linked to the rotation of the image rotation optical member every time the rotation angle of the image rotation optical member changes as described above. By controlling the image position correcting optical member in accordance with the above and correcting the positional deviation of the projected image on the screen surface due to the optical axis deviation of the image rotating optical member accompanying the rotation of the image rotating optical member, Compared to a structure that requires complicated adjustment such as a precise annular cam and cam follower, it has a simple structure with a small number of parts, and the optical axis shift accompanying the rotation of the image rotation optical member while suppressing the cost increase. Satisfactorily correct Things can, it becomes possible to almost omitted adjusted by using in combination with means for detecting an effective area of the projected image, it is possible to improve operability, reliability, and productivity.

[0034]

【Example】

<Embodiment 1> (FIGS. 1 to 3) FIG. 1 is a schematic configuration diagram of a microfilm reader printer as an information processing apparatus according to the present invention. Figure 5 above
The same components and parts as those of the reader printer shown in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, a slit disk 25 is provided on the prism 7 as an optical member for image rotation concentrically with the prism rotation gear 22 on the outer periphery thereof.
5 is equipped with a sensor 26 such as a pair of photo interrupters, and photo encoders 25 and 26 are provided as a rotation angle detecting means of the gear 22, that is, the prism 7.

Then, in order to correct the posture of the tilt projection image 13 on the surface of the screen 12, when the knob 21 is rotated to rotate the prism 7 as required, the rotation angle of the prism is detected by the photo encoders 25 and 26. The angle information is input to the control circuit 20.

A relationship table between the rotation angle of the prism 7 and the amount of optical axis deviation is input to the control circuit 20 in advance and stored in the memory. The control circuit 20 calculates the optical axis shift amount of the prism 7 at the rotation angle based on the prism rotation angle data from the photo encoders 25 and 26, and controls the angle of the second mirror 9 as the image position correcting optical member. Cam 14a
The drive pulse motors 14 and 15 of 15a are rotated by a predetermined calculation angle in a direction in which the positional deviation of the projected image on the screen due to the optical axis deviation caused by the rotation of the prism 7 is corrected.

That is, as described above with reference to FIG. 8, the center of the projected image 13 on the surface of the screen 12 moves due to the optical axis shift caused by the rotation of the prism 7.

When the deviation of the center of the projected image of FIG. 8 due to the rotation of the prism 7 is focused on in the vertical direction, it becomes as shown in FIG. The X axis represents the rotation angle of the prism 7, and the Y axis represents the vertical shift. In order to correct this vertical displacement,
The angle about the side a of the second mirror 9 is controlled by controlling the pulse motor 14 so that the image moves on the screen 12 in the direction opposite to the direction of deviation of the center of the projected image.

The shift in the left-right direction is as shown in FIG. The X axis represents the rotation angle of the prism 7, and the Y axis represents the lateral shift. In order to correct the shift in the left-right direction, the angle about the side b of the second mirror 9 is controlled so that the image moves in the direction opposite to the shift direction of the center of the projected image. Let

These correction control operations are performed simultaneously when the prism 7 is rotated.

The image position correction by the angle control of the mirror 9 causes image distortion, but the deviation of the optical axis does not require the image position correction to the extent that the image distortion becomes a problem, so that there is no problem in use.

As described above, in association with the rotation operation of the prism 7 which is the optical member for image rotation, according to the rotation angle,
The second mirror 9 is controlled to change a predetermined angle in a direction for correcting the positional deviation of the projected image on the screen due to the optical axis deviation caused by the rotation of the prism 7, so that the optical axis deviation due to the rotation of the prism 7 causes the second mirror 9 on the screen. The second mirror 9 which is an optical member for image position correction and its drive control means 20. 1 for correcting the positional deviation of the projected image of No. 1 require no special mechanism.
It is done automatically using 4.14a.15.15a,
It is also possible to prevent the operability from being lowered by moving the projected image vertically and horizontally when operating the image on the screen.

As the prism rotation angle detecting means, in addition to the photo encoders 25 and 26 described above, a method using a variable resistor and a method using an electric contact can be cited, and any of them can be effectively used.

Further, the second image-correcting optical member is used.
Of course, the mirror 9 also has the original function of moving the effective image portion of the projected image to the center of the screen 12. That is, a signal from an image area sensor (not shown) that detects an effective image area on the screen 12 is input to the control circuit 20, and the pulse motors 14 and 15 are respectively set to predetermined values based on the data detected using the input signal. The second mirror 9 is driven to rotate by the calculated angle so that the effective image portion moves to the center of the screen 12, and the angle control centering on the side a side and the angle control centering on the side b side are performed.

<Embodiment 2> In the apparatus of Embodiment 1 described above, a service person or an operator rotates the prism 7 to input the relationship table between the rotation angle of the prism 7 and the optical axis shift amount to the control circuit 20. By confirming the center movement state of the projected image on the screen 12 for each rotation angle of the prism 7, the relationship between the rotation angle of the prism 7 and the optical axis deviation amount is input to the control circuit 20 from a keyboard (not shown) or the like. There is.
However, this operation is a little complicated.

In the second embodiment, an image area sensor (not shown) for detecting the effective image area on the screen 12 is used to detect the movement of the image area for each rotation angle of the prism 7, and based on the detected data. The amount of optical axis deviation due to the rotation of the prism 7 is obtained, and the optical axis deviation correction amount in the second mirror 9 is automatically adjusted when the prism 7 is rotated.

As described with reference to FIG. 8 above, the prism 7
The center of the projected image 13 on the surface of the screen 12 moves due to the optical axis shift caused by the rotation of the. The movement of the center of the projected image due to the optical axis shift when the prism 7 is manufactured is shown in FIG.
Since it takes a form substantially close to, the necessary correction amount can be known by measuring the amount of deviation at points a and b in FIG. This time,
For any prism, points a and b are at the same angle from point c.

Now, when the state of setting the optical axis deviation correction amount is entered, first, at point c, the image area is detected using an image area sensor (not shown). Next, at the part corresponding to the point a,
The image 13 projected on the screen 12 is similarly detected using an image area sensor (not shown),
The deviation of the image area is obtained by comparing with the image area detection data obtained at the point c.

Next, the prism 7 is rotated, and the same operation is performed at the point b.

The correction amount of the mirror 9 at each rotation angle of the prism 7 can be obtained by calculating the similar figure of FIG. 8 based on the data obtained in this way.

As a result, the complicated adjustment process requires an operation for rotating the prism 7 from the outside, and a remarkable improvement in productivity can be obtained.

<Third Embodiment> (FIG. 4) In the second embodiment described above, the prism 7 is pulsed as shown in FIG. 4 although the prism 7 is manually rotated when the optical axis deviation is adjusted. In the case of a reader printer configured to be rotated using a driving means such as a motor 27, the adjustment process can be automated by the reader printer itself performing the prism rotation operation when adjusting the optical axis deviation. .

The rotation of the prism 7 is carried out by transmitting the rotational force of the pulse motor 27 to the gear 22 via the gear 27a. Reference numeral 28 denotes a home position sensor of the prism 7, and a slit plate 28a attached to the gear 22 for indicating the home position is the gear 22 detected by the sensor 28, that is, the rotation angle position of the prism 7 is the home position of the prism 7. . The control circuit 20
When the power is turned on, the pulse motor 27 is driven to drive the prism 7
After detecting the home position of, the prism rotation angle is controlled by counting the number of output pulses.

[0055]

As described above, the present invention focuses on the existing image position correcting optical member in the projection means, and shifts the optical axis of the image rotating optical member with the rotation of the image rotating optical member. Is also used as a position deviation correcting means for the projected image on the screen surface by the optical axis, and every time the rotation angle of the image rotation optical member changes, the rotation angle of the image rotation optical member is linked to the rotation of the image rotation optical member. By controlling the image position correcting optical member in accordance with the above and correcting the positional deviation of the projected image on the screen surface due to the optical axis deviation of the image rotating optical member accompanying the rotation of the image rotating optical member, Compared to a structure that requires complicated adjustment such as a precise annular cam and cam follower, it has a simple structure with a small number of parts, and the optical axis shift accompanying the rotation of the image rotation optical member while suppressing the cost increase. Good correction That it is possible, it becomes possible to almost omitted adjusted by using in combination with means for detecting an effective area of the projected image, it is possible to improve operability, reliability, and productivity.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a microfilm reader printer according to a first embodiment.

FIG. 2 is a graph of a vertical rotation amount of a prism rotation angle and a projected image center.

FIG. 3 is a graph of a prism rotation angle and a lateral shift amount of a projected image center.

FIG. 4 is a perspective view of a main part of the device according to the third embodiment.

FIG. 5 is a schematic configuration diagram of a conventional microfilm reader printer.

FIG. 6 is a schematic configuration diagram of a printer mechanism unit.

7A is a diagram of a projected image in a tilted state, and FIG. 7B is a diagram of a projected image after rotation correction.

FIG. 8 is a movement locus diagram of the center of the projected image due to the optical axis shift caused by the rotation of the prism.

FIG. 9 is a perspective view of an example of an optical axis shift correction mechanism associated with rotation of a prism.

[Explanation of symbols]

1 Lighting Lamp 5 Micro Film (Information Recording Medium) 6 Projection Lens 7 Image Rotating Prism 8-11 Mirror 12 Screen 13 Projected Image 21/22 Prism Rotating Knob and Gear 25/26 Photo Encoder (Prism Rotation Angle Detection Means ) 14/15 second mirror (image position correcting optical member) drive source 14a / 15a cam 16/18/17/19 photo interrupter and slit plate 20 control circuit

Claims (8)

[Claims] 1. Image light of an information recording medium is image-projected onto a screen surface by a projection means including an image rotation optical member and an image position correction optical member, and the screen surface is rotated by rotating the image rotation optical member. In an information processing apparatus that corrects the posture of the projected image above by correcting the position of the projected image on the screen surface by controlling the image position correcting optical member, the image is corrected every time the rotation angle of the image rotating optical member changes. Due to the optical axis shift of the image rotation optical member caused by the rotation of the image rotation optical member by controlling the image position correction optical member in association with the rotation angle of the image rotation optical member in association with the rotation of the rotation optical member. An information processing device, characterized in that a positional deviation of a projected image on a screen surface is corrected. 2. The information processing apparatus according to claim 1, wherein the information processing apparatus has a recording function of guiding the image light to a printing unit or a reading unit via the projection unit to record an image. 3. An optical member for image position correction is provided with a means for detecting the rotation angle of the optical member, and the image position correcting optical member is controlled by the control means in correspondence with the detection angle information of the detection means. The information processing apparatus according to claim 1. 4. An image position correcting optical member is provided with a means for detecting an effective area of a projected image on a screen surface, and the image position correcting optical member is controlled by the control means in correspondence with detection position information of the detecting means. The information processing device according to claim 1. 5. A means for detecting a rotation angle of an image rotation optical member and a means for detecting an effective area of a projected image on a screen surface, wherein both means are used to rotate the image rotation optical member. The information processing apparatus according to claim 1, wherein the information processing apparatus has a function of measuring a shift amount of the optical axis that accompanies it and determining a correction amount of the optical axis shift. 6. The information processing apparatus according to claim 1, wherein the image rotation optical member is a prism. 7. The image position correcting optical member is a mirror, and the position of the projected image on the screen surface is corrected by controlling the angular posture of the mirror by the control means. Information processing equipment. 8. The information processing apparatus according to claim 1, wherein the information processing apparatus is a reader of an information recording medium such as a microfilm or a reader printer.