JPS63202732A - Film projector - Google Patents

Abstract

PURPOSE:To reduce a decrease in lighting on a screen by varying an area where retrieval marks are lighted and varying the quantity of lighting according to the lighting area when detecting retrieval marks provided to sides of frames of a film. CONSTITUTION:Light from an exposure lamp 22 is controlled by a condenser lens 36 to illuminate the film F. An image of the film F is enlarged by a projection module 3, reflected by mirrors 38a-38e, and projected on the screen 1 in reader mode or recorded on recording paper P on a copying mechanism 68. At this time, the film F is moved breadthwise so as to decide whether or not there are plural frames in the width direction of the film F; and a sensor detects the retrieval marks provided to the sides of the frames of the frame F to decide the number of the frames. At this time, the lighting area is expanded so that no retrieval mark exits from the lighting area, and the quantity of lighting is increased corresponding to the area. Thus, the quantity of lighting is varied according to variation of the lighting area to eliminate a decrease in the illuminance on the screen, thereby making a projection image easy to see.

Description

[Detailed Description of the Invention] The present invention relates to a microfilm league or a microfilm league in which desired information can be searched by searching the search mark provided on the side of each frame of the film. The present invention relates to film projection devices such as film printers.

'r and its i Conventional film projection devices such as microfilm leagues and microfilm printers use film with search marks provided on the sides of each frame of the film, and the search marks are optically detected and The system is configured to automatically search for a desired frame in the film by counting.

Incidentally, there are three types of typical films used in the film projection apparatus as shown in FIGS. 18(a) to 18(c).

As shown in FIG. 18(A), the first film has one frame FF formed in the width direction of the film F, and one image is formed on this one frame FF. is imprinted thereon, and a search mark M is provided on one side of each frame FF. This type of film is commonly referred to as simplex film.

As shown in FIG. 18(B), the second film is divided into two columns along the longitudinal direction of the film F, and search marks M are formed on both sides of the film F. It is something that This type of film is usually called a duo film, and among the two divided columns, one column is called A channel CA and the other column is called B channel C3. This duo film is made by imprinting a continuous image on each frame FF a of the A channel CA, then reversing the film F, and imprinting another continuous image on each frame FF, + of the B channel C3. By embedding multiple images, it is possible to search for a plurality of consecutive images that are connected to each other.

As shown in FIG. 18(C), the third film is divided into two columns along the longitudinal direction of the film F, and a search mark M is formed on one side of the film F. It was formed. This type of film is usually
It is called a duplex film and has an A channel Ca and a B channel C3 like the above-mentioned duo film. This duplex film has FFA, which consists of multiple consecutive images that are connected to each other.

FFm, FFa, FFa, . . . are printed in this order.

When the film F is irradiated with a light source such as an exposure lamp, an illuminated area is formed, and the illuminated area is projected onto the screen as a projected image.

By the way, in such a film projection apparatus, it is often desired to enlarge and project a part of the projected image projected on the screen.

However, in general, the light intensity distribution in the illumination area is high at the center of the film F and low at the periphery, as shown in FIG. Moreover, when enlarging and projecting, there is a drawback that the overall illuminance decreases. Therefore, when the illumination area is expanded, the illuminance of the screen decreases, making the screen dark and difficult to see.

In addition, especially with duo films and duplex films, multiple images are projected in the width direction, so when searching by moving the film in the width direction and enlarging one of the images, the above-mentioned As the illuminance near the search mark M corresponding to the periphery of the film F becomes darker,
There is a problem in that the amount of light incident on the search mark sensor is reduced, and there is a possibility that the search mark may be detected incorrectly.

It is an object of the present invention to solve these conventional problems and provide a film projection device suitable for information retrieval.

4. In order to achieve the above-mentioned object of determining a point, the film projection device of the present invention includes a film transport mechanism that longitudinally transports a film on which search marks are formed on the sides of frames, and a film transport mechanism that transports a film on which search marks are formed on the sides of frames, a projection optical system for projecting an image, a first control means for changing the illumination area of the film, and a second control means for changing the amount of illumination light as appropriate in response to the change in the illumination area. The gist is:

According to the above configuration, the amount of illumination light changes as appropriate in response to changes in the illumination area of the film, so it is possible to control the illuminance on the screen so that it does not decrease, making it easier to perform information retrieval work. A film projection device suitable for this can be obtained.

Fork-stand-■ Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 2 shows a reader printer as an example of a film projection device according to the present invention, in which a reader printer main body 2 having a screen 1 in the center and a film F on which a number of images are imprinted are conveyed in the direction of arrow X. Film carrier section 3
and a control section 5 which is connected to the film carrier section 3 via a cable 4 and controls the film transport speed, etc.
It consists of The reader printer also includes a projection optical system 6, and is configured to be switchable between a reader mode in which an image is enlarged and projected onto the screen 1, and a print mode in which the image is enlarged and copied onto recording paper.

FIG. 3 is a perspective view showing the film carrier section 3, including a film feeding mechanism 7 that transports the film F in the longitudinal direction (indicated by arrow X), and a film transport mechanism 7 that transports the film F in the width direction (indicated by arrow Y). A film moving mechanism 8 is provided.

Specifically, the film feeding mechanism 7 includes a first motor 10 rotating in the direction of arrow A, a rotating shaft 11 connected to the first motor 10 via a pinion 9. A supply reel 13 housed and detachable from the rotating shaft 11, a second motor 15 rotating in the direction of arrow B, and a take-up reel connected to the second motor 15 via a pinion 14.14. 16, a light irradiation unit 18 which is composed of a pair of upper and lower glass plates 17a and 17b and which sandwiches the film F, an appropriate number of guide rollers 19 which guide the conveyance of the film F, and a delivery belt 20. ,
It consists of a peeling belt 21. Further, the light irradiation section 18 is
When the film carrier section 3 is assembled into the league printer main body 2, the projection light axis from the exposure lamp 22 as an example of a light source is configured to coincide with the center of the film F.

23 is a moving table on which the film transport mechanism 7 is mounted.

In the film feeding mechanism 7 configured in this way,
When the cartridge 12 containing the supply reel 13 is mounted on the rotating shaft 11, the supply reel 13 momentarily rotates in the direction of arrow C. This is to eliminate slack in the film F wound around the supply reel 13. Next, a delivery belt 20 that is interlocked with a delivery motor (not shown) is brought into contact with the film F, the supply reel 13 is rotated in the direction of the arrow, and the leading end of the film F is pulled out via the peeling belt 21.

Thereafter, by driving the feed motor, the leading edge of the film F is moved to the guide rollers 19 and the light irradiation section 18.
The film passes through the gap between the pair of glass plates 17a and 17b constituting the film, and is wound onto the take-up reel 16. Thereafter, the delivery belt 20 and the peeling bell 1-21 are separated from the film F, and the film F is separated from the pair of glass plates 17a,
17b. Thereafter, the first motor 10 is appropriately driven to advance the film F, and the second motor 15 is driven to retract the film F, either in the forward or reverse direction. The film F can be conveyed in any direction.

Therefore, the film moving mechanism 8
, a base 25 having a substantially gate-shaped cross section that is slidably fitted onto a table 24 fixed to the league printer main body, and a third motor 27 with a pinion 26 pivotally supported and provided on the movable table 23. and a rank 28 which is fixed to the base 25 and meshes with the pinion 26. In addition, the moving table 23 has three long holes 29a, 29b,
29C is formed. The rack 28 is held in a state exposed to the movable table 23 by the elongated hole 29c, and guide pins 30a and 30b whose tips are fixed to the base 25 are engaged with the elongated holes 29a and 29b. As a result, the movable table 23 and the base 25 are connected. Furthermore, a rotary encoder 31 is attached to the third motor 27, and by making the third motor 27 capable of forward and reverse rotation, the moving table 23 is moved in the width direction of the film F with respect to the base 25. and the third motor 27 can be controlled by the rotary encoder 31.
The rotation speed is outputted as an electric signal, and the relative position between the moving stage 23 and the base 25 is detected via a film moving mechanism control section, which will be described later. In addition, in consideration of the case where a duplex film is used, the film moving mechanism 8 includes a frame feeding means for sequentially selecting and projecting two frames FFA and FF arranged in the width direction of the film F. It is installed.

A search mark sensor 32 is provided on the surface of one of the glass plates 17a constituting the light irradiation section 18. As shown in FIG. 4, the search mark sensor 32 includes two light-receiving elements 33 facing each other with a film F in between.
a, 33b, and the light receiving element 33 via the cable 34.
a, 33b, and a search mark sensor body 35 connected to the search mark sensor body 35.

Further, a reference voltage (reference value) for detecting the search mark M is preset in the search mark sensor main body 35. In the search mark sensor configured in this way, for example, as shown in FIG. 4, the duplex film is conveyed in the direction of the arrow
When the search mark M intercepts the search mark M, the light receiving element 33a detects a change in the received light intensity, and then this change in the received light intensity is converted into a voltage. When the voltage is higher than the reference voltage, the search mark sensor main body 35 is activated and detects the search mark M. and the search mark sensor 32
A film counter (not shown) is incremented each time a search mark M is detected, and the frame FFA (
or FFI) is searched. Although not shown in the drawings, it goes without saying that in the case of a duo film, the search marks M of the A channel CA and the B channel C8 are detected by both the light receiving elements 33a and 33b.

FIG. 5 is a diagram schematically showing the outline of the projection optical system 6. As shown in FIG. That is, the projection optical system 6 includes the exposure lamp 22 and a condenser lens 36 (which moves in the direction of the arrow G as appropriate to change the illumination area of the film F via a drive means to be described later).
(hereinafter referred to as "C lens"), the above-mentioned light irradiation unit 18 that holds the film F, a projection module 37, and a plurality of mirrors 38a to 38e. Further, the projection module 37 has a projection lens 39 (hereinafter referred to as "P lens") that magnifies the image on the film P.
It consists of a lens unit 42 and a ladder-shaped image rotation prism 40. When the image on the film P is projected sideways or upside down, the image rotating prism 40 is rotated in the direction of arrow E by operating a push button switch (not shown) to transfer the film image onto the screen 1. It is intended to be projected as a royal image.

In such a projection optical system 6, in the reader mode, the image of the film F irradiated via the exposure lamp 22 and the C lens 36 passes through the projection module 37, and is transferred from the first mirror 38a to the second mirror. 38b - The image is enlarged and projected onto the screen 1 via the third mirror 38c. In the print mode, the second mirror 38b is rotated in the direction of arrow F, and the image that has passed through the projection module 37 passes through the first mirror 38a, the fourth mirror 38d, and the fifth mirror 38e. , is enlarged and copied onto the recording paper P via the copying mechanism 68. That is, the copying mechanism 68 is comprised of a well-known electrophotographic process such as a photosensitive drum 41 and a charging device (not shown), a developing device, a transfer device, a cleaning device, a static eliminating device, etc., and the film image that has passed through the mirror 38e is exposed to light. An electrostatic latent image is formed on the body drum 41, and then an enlarged copy of the film image is formed on the recording paper P through the electrophotographic process described above.

FIG. 6 shows a perspective view of the P lens unit 42 constituting the projection module 37. 43 is a mounting plate that holds the P lens 39 in an externally fitted manner; 44 is a P lens identification sensor that recognizes the magnification of the P lens 39; The P lens identification sensor 44 is composed of three photointerrupters 45a+45b+45c which are a combination of a light receiving element and a light emitting element. Further, the mounting plate 43 has cutout-like uneven portions 46a, 46b, and 46C formed on one end edge thereof. And the photointerrupters 45 a, 45 b, 45
c and the uneven portions 46 a and 46 b of the mounting plate 43
, 46c, the magnification of the P lens 39 is recognized and appropriately controlled by the S control mechanism described later.

7 and 8 are diagrams showing a C lens driving means 48 for moving the C lens 36 in the direction of arrow G. The C lens driving means 48 includes a pulse motor 49 fixed to a base 47, a binion 50 that is pivotally supported by the pulse motor 49, and a rack 51 that meshes with the binion 50.
and the first support member 5 while holding the C lens 36.
It consists of a holder 53 to which the rack 51 is fixed via 2, and a travel element 57 which is fixed to the holder 53 via a second support member 56 which is rectangular in plan view. Then, the holder 5
3 has one end slidably supported on a shaft 55 by a slide bearing 54 via the first support member 52, and
The other end of the holder 53 can be freely runnable on the base 47 by a running member 57 via a second support member 56 . The C lens driving means 48 is configured as described above, and by driving the pulse motor 49 to perform forward or reverse rotation by a predetermined amount, the C lens 36 held by the holder 53 is moved in the direction indicated by the arrow. It is said to be able to freely move forward and backward in the G direction.

FIG. 9 is a block diagram showing the control system of the reader printer of this embodiment. 58 is a CPU, which includes an arithmetic unit and a ROM.
, RAM, I10 port, etc. Reference numeral 59 indicates a key manual section, in which parameters such as scan mode setting, search mode setting, number of copies, search target frame, etc. are manually input. The key human power section 59 is an example of a determining means that can determine whether or not a plurality of frames exist in the width direction of the film F, and includes:
By selecting the search mode setting, it is possible to manually determine whether the film is a duplex film that needs to be moved in the width direction or a simplex film that does not need to be moved in the width direction. Also, to distinguish between simplex film (or duplex film) and duo film, the frame format of film F is different.
This can be automatically determined using a control mechanism that will be described later. The scan mode is used to set whether to prohibit or permit movement of the film F in the width direction. Reference numeral 60 denotes a display section on which the number of copies, frame number, etc. are displayed.

Thus, the light from the exposure lamp 22 that has passed through the film F is received by the light receiving element 33a and/or 33b.
As described above, the photoelectric conversion element of the search mark sensor 32 converts the amount of light transmitted through the film into voltage. Then, the search mark sensor 32 detects the change in voltage caused by the passage of the search mark M, and detects the change in the voltage of the A channel C through the search mark detection unit 61.
The detection signal of the search mark M of the A and B channels C3 is
Input to PO58. Further, when the P lens identification sensor 44 is irradiated with light, a photointerrupter 45a is activated.

45b and 45C are uneven parts 46a and 46b of the mounting plate 43,
46c is read, the magnification of the P lens 39 is recognized, and the electrical signal is sent to the CPO 5 via the P lens identification section 62.
Make it B. On the other hand, parameters such as scan mode settings are input to the CPU 58 from the key human power section 59, and the
From the PU 58 to the copy process control unit 63. C lens driving means control section 64, exposure lamp illuminance control section 65. Control signals are transmitted to the film transport mechanism control section 66 and the film movement mechanism control section 67, respectively.

The C lens drive means control section 64 is an example of a first control means that is a feature of the present invention, and the C.
According to the information G from 58 indicating the position of the C lens 36, the pulse motor 49 is driven to move the C lens to a desired position. That is, in the reader mode, the illumination area of the film F is controlled so that the search mark M does not deviate from the illumination area even when the third motor 27 of the film moving mechanism 8 is driven and the film F is moved in the width direction. The position of the C lens is set in the direction of magnification. Furthermore, in this embodiment, the C lens driving means 64 is configured to move the C lens appropriately in accordance with the magnification of the P lens so that optimum copying can be performed in the print mode.

Further, the exposure lamp control section 65 is an example of a second control means, and controls the light amount of the exposure lamp 22 using a well-known phase angle power control method according to information instructing the light amount from the CPU 58. That is, when the C lens 36 is set in a direction in which the illumination area is expanded by the C lens driving means control section 64, the amount of illumination light normally decreases and the projected image becomes difficult to see.Therefore, in this embodiment, The exposure lamp control section 65 changes the voltage of the exposure lamp 22 in response to changes in the illumination area due to the movement of the C lens, so that a constant light amount is always maintained.In other words, the C lens driving means 64 When the illumination area is expanded, the exposure lamp control section 65 is controlled to increase the voltage of the exposure lamp 22 in order to compensate for the decrease in the amount of illumination light.

The copying process control section 63 controls the copying mechanism 68 in accordance with commands from the CPU 58 to perform a copying operation. The film feeding mechanism control section 66 is controlled by the CPU 5.
The first motor 10 and the second motor 15 are controlled based on the information G that instructs the transport speed, transport direction, etc. from B, and the film F is moved forward or backward. The film moving mechanism control section 67 drives the third motor 27 (see FIG. 3) in accordance with information from the CPU 5B instructing the film projection position. Further, a display command such as the number of copies is transmitted from the CPU 5B to the display section 60, and a predetermined display is performed.

Next, the control procedure of this embodiment is shown in FIGS. 1 and 10 to 16.
A detailed explanation will be given based on the flowchart shown in the figure. The flags used in these flowcharts are defined as shown in Table 1.

[Margin below]

1 is a flowchart showing the overall control procedure of this embodiment.

Steps (Sl) to (S4) show the initial setting state. In other words, by setting (ENB) to "0", the scan prohibition mode is set and Sl), (BC
By setting NT) to "0", the counter that counts the number of B channels is set to "0", and by setting (DUO) to "0", the mode is set to non-duo film (32); Next, by setting (MODE) to "0", the simplex/duo search mode is entered (S3), and the power is turned on. Next, enter the initial value of the number of pieces for A channel and B channel manually (S4)
, load the film and output the frames (S5)
, and then enters into concrete control.

First, it is determined whether (ENB) = 0, that is, whether there is a possibility of the film moving in the width direction.
)=0, proceed to route A; if (ENB)=1, proceed to route B. When proceeding to route A, first execute the subroutine for C lens processing 1 (S7), then execute the subroutine for exposure lamp processing 1 (S8),
Thereafter, it is determined whether there is a print request (S9).

In this route A, the position of the C lens 36 and the illuminance of the exposure lamp 22 are set to be optimal for copying by C lens processing 1 (C lens driving means control section 64) and exposure lamp processing 1 (exposure lamp control section). It is something. Specifically, as shown in FIG. 10, in the C lens processing 1, the magnification of the P lens 39 attached to the projection optical system 6 is read via the P lens identification sensor 44 (S71), and the electrical signal is read. Input to CPU 58. Then the CPU5
The C lens driving means 48 is appropriately driven in accordance with the information from the B lens, and the C lens is moved to the optimum position for copying according to the magnification of the P lens 39 (S72), and the process returns (S72).
S73). In other words, even if the copy size is the same A4 size, the copy area of the film will be different if the magnification of the P lens is different, but in this example, if the magnification of the P lens is large, the position of the C lens is set in a direction that narrows down the magnification of the P lens. The position of the C lens is set so that the illuminance of the copying area of the film is uniform.

In addition, as shown in FIG. 11, the exposure lamp processing 1 is as follows:
The magnification of the P lens 39 is read in the same manner as the step (S71) of C lens processing 1 (S82), and then the light amount is set by the exposure lamp control unit 65 (S83).
That is, the position of the C lens differs depending on the magnification of the attached P lens, and therefore the illuminance of the copy area also changes.

On the other hand, if (ENB)=1 in step (S6), the flow of route B is proceeded. In this case, it is the scan permission mode, that is, the mode in which the film can be moved in the width direction, and the C lens processing 2 subroutine is executed (5IO).
Next, execute the exposure lamp processing 2 subroutine.
l), then determine whether there is a print request (3
9).

This route B is C
The position of the lens 36 and the illuminance of the exposure lamp 22 are set. Specifically, in the above C lens processing 2, C
The lens driving means 48 is driven, and as shown in FIG.
Move and set the C lens to the optimal position for detecting the search mark M so as not to depend on the magnification of the attached P lens (S
101). In other words, normally, the larger the magnification of the P lens, the narrower the illumination area of the film, and if the film is moved in the width direction, there is a risk that the search mark M will go outside the illumination area, but even if the film is moved in the width direction, To prevent the search mark M from leaving the illumination area, C is set regardless of the magnification of the P lens.
By setting the optimum position of the lens 36, the search mark M can be detected.

Further, in the exposure lamp processing 2, as shown in FIG. 13, the exposure lamp control section 65 sets the illuminance to be optimal for searching for a film (S111). For example, when the film F is moved in the width direction as described above, the illumination area is expanded to include the movement range by the C lens processing 2 (S10), regardless of the magnification of the P lens 39. Expanding the illumination area usually reduces the illuminance at the film surface. Therefore, this exposure lamp processing 2 (S1
In 1), in order to prevent the above-mentioned decrease in illuminance, the illumination area is
Exposure lamp 22 when enlarged by lens processing 2
The voltage is controlled to increase.

After the C lens 36 and the exposure lamp 22 are set optimally for copying processing or search mark M detection in this way, predetermined copying processing, search processing, etc. are performed. Next, these control procedures will be explained in detail.

Print processing, search processing, scan mode change processing,
If none of the search mode changing processes is requested, the process returns to step (S6) through the flow of (S9)→(S12)→(S13)→(S14).

When there is a request to change the search mode, for example, to change the simplex/duo search mode to the duplex search mode, the process proceeds from step (S14) to the flow of route 1, i.e., in this case, the duplex search is performed. Manually change the mode (315),
Next, check whether you are in duplex mode or not.
16) If it is detected that the film is a depressing film, then (MODE) is set to "1" (317), and the process returns to step (S6). If you want to search for a film other than Deuflex film, manually select the film mode (515), confirm that it is not a Deuflex film (516), set (MODE) to "0" (31B), and step (31B). Return to S6). This route 1
shows an example of a determining means for determining whether or not a plurality of frames exist in the width direction of the film F.

If there is a request to change the scan mode, (S9)→(
Proceed to S12)-(S13), and this step (S13)
Proceed to route 2 flow. That is, for example, if it is desired to change the scan prohibition mode to the scan permission mode, the scan permission mode is manually activated (S19). Next, check whether the mode is scan permission mode (520).
Set (ENB) = 1 for scan permission mode (521), and (ENB) = 0 for scan prohibition mode.
522) and returns to step (S6). This scan mode changing process is performed by the film moving mechanism control section 67.

If there is a request for search processing, the process proceeds to route 3 from step (312). That is, when there is a search request, first enter the search target frame number (TN) manually (523), then enter the search process subroutine (324) and the film scan process subroutine (324), which will be described later.
After executing step S25) and projecting a predetermined image on the screen, the process returns to step S6. This search request processing is processed by the film feeding mechanism control section 66 and film movement mechanism control section 67.

If there is a print request, proceed to the flow of route 4 from step (S9). In other words, if there is a print request, first manually enter the desired number of copies using the 326 key.
), the C lens processing 1 subroutine is executed in the same manner as the flow shown in FIG. 10, and the position of the C lens is set to be optimal for copying (S27). This C lens processing 1 is always executed when printing is performed in any case. Next, a copy processing subroutine is executed (328), and the process returns to step (S6).

Note that after C lens processing 1 (S27), it is necessary to perform exposure lamp processing 1 similar to step (S8), but in this embodiment, this exposure lamp processing 1 is included in the copy processing (328). . Note that this printing process is performed by the copying process control section 63.

Therefore, in the above search process, the piece number of the A channel or the piece number of the B
This is done by matching the frame number of the channel with the search target frame number. FIG. 14 is a flowchart showing the control procedure for search processing. First, when the search processing subroutine is called (S24), it is checked whether the frame number of the A channel is the frame number for the purpose of search (S201). And if the piece number of A channel is the same as the piece number for search purpose, A
Set the channel as the search end channel (5202), stop the first and second motors 10 and 15 (see FIG. 3), stop the film (S203), and return (S2).
04). If the A-channel piece number and the retrieval-purpose piece number are different, it is checked whether the B-channel piece number is equal to the retrieval-purpose piece number (S205).

If the piece number of the B channel and the piece number for the search purpose are the same, the B channel is set as the search end channel and 320
6), then proceed through the same flow (S203) to (3204) as described above.

Next, if neither the A channel nor the B channel is the piece number for the search purpose, it is first checked whether the piece number of the A channel is larger than the piece number for the search purpose (S207).
). If the frame number of the A channel is larger than the frame number to be searched ((AN)>(TN)), the frame number to be searched is searched by proceeding through the flow of route 5 and retracting the film. On the other hand, if the frame number of the A channel is smaller than the frame number to be searched for, the search is performed on the B channel side.

That is, it is checked whether the frame number of the B channel is smaller than the frame number for search purpose ((BN)<(TN)) (320B). The search mark M is present on the B channel only in the case of Duo film, and as mentioned above, the A channel and B channel are reversed and continuously imprinted on the Duo film, so ((BN)< (TN
)), similarly to ((AN)>(TN)), the frame number to be searched for is retrieved by passing through the flow of route 5 and retracting the film. Specifically, this route 5 first outputs the film return output (5209),
Next, it is checked whether there is a search mark M on the A channel (S210). If there is a search mark M on the A channel, (AN) is set to ((AN)-1) and the film is moved back one frame (S211).

Also, in step (S210), the search mark M is placed on the A channel.
If there is no search mark M, a check is made to see if there is a search mark M on the B channel (S212). If there is no search mark M on the B channel, the process returns to step (S201). If there is a search mark M on the B channel, (BN
) to ((BN)+1)5213), then (
BCNT) is set to ((BCNT)-1) and the film is moved back one frame (5214), and the process returns to step S20.

Note that the film return output in step (S209) is performed by driving the second motor 15 (see FIG. 3).

Also, if the piece number of the A channel is smaller than the piece number for the search purpose ((AN) < (TN)), and the piece number of the B channel is larger than the piece number for the search purpose ((BN)>
(TN)") performs the search by advancing the frame in the film advance direction. In other words, it issues a film advance output (5215), and then follows the steps shown in the flowchart (S216) → (3217) → (S218). →(32
19)→(S220), etc. Thereafter, the subroutine "rBCh check to reconfirm that this film is a duo film" is executed (5221), and then the process returns to step (S201). Note that the film feed output in step (S215) can be performed by driving the first motor 10.

This process is repeated until the frame number on the A channel side or the B channel side matches the frame number for the search purpose. That is, (S201) → (S 202) → (S 203) →
(3204) or (205) → (S 206) → (S
The search operation is repeated until the flow goes through 20'3)→(S334).

FIG. 15 is a flowchart showing the subroutine of the above rBCh check, which determines whether the film used is a duo film. That is,
When the rBCh check J subroutine is called,
First, check whether the number of search marks for B channel is 10 or more ((
BCNT)≧10) is checked (S222). If (BCNT)<10, it is determined that it is not a duo film, and the process returns (S224). Also (B
CNT) ≧10, it is determined that it is a duo film,
(DUO) is set to "1" (S223), and the process returns (S224).

FIG. 16 shows a subroutine flowchart of the film scanning process (S25) in FIG. 1. When this subroutine is called, it is first checked whether scanning is permitted (S301). If scanning is not permitted, output a scan neutral output on the screen (5302) and return (
S303). In this case, the image is projected so that the center of the screen and the center of the film F coincide. If scanning is permitted, it is checked whether the search mode is simplex/duo search mode (S304). If you are in simplex or duo search mode, check whether it is a duo film or not (5305).
If it is not a duo film, it is a simplex film, so only one image is recorded on each frame of film F, and a scan neutral output is generated.53
02), return (S303). Also, in the case of duplex search mode and duo search mode, check whether the search end channel is A channel (8305), and if it is A channel, issue scan A channel output (S307) and return (S303). .

In this case, the film image projected on the A channel is projected so that its center coincides with the center of the screen. On the other hand, if the search end channel is not the A channel, that is, if the search end channel is the B channel, output the scan B channel output (8308) and return (3303).
). In this case, the film image projected on the B channel is projected so that its center coincides with the center of the screen.

FIGS. 17A to 17C show an example of a projected image when the film F is projected onto the screen 1 of the reader printer configured as described above. In other words, the dimension d in the width direction of the simplex film frame FFO is usually
The magnification is set so that v is approximately equal to the vertical dimension 1) v of the screen 1. and,
Each frame FF of the simplex film is moved by the moving stage 23 (see FIG. 3) of the film carrier section 3 so that the center line Co along the longitudinal direction of the film coincides with the center line Cs of the screen 1. It is positioned and the 17th
The image is projected as shown in Figure (a) (scan neutral output).

Furthermore, if a duo film or duplex film is used in this state, as shown in FIG.
, respectively, are projected on the screen 1 vertically side by side.

Therefore, in this reader printer, by changing the magnification of the P lens, it is possible to enlarge and project the A channel or the B channel together with the search mark M onto the screen 1. That is, when using a duo film or a duplex film, the film moving mechanism 8 moves the entire moving stage 23 of the film carrier section 3 in the width direction of the film F to change the relative position between the film F and the screen 1. In addition, as mentioned above, the film F
The C lens is set to move so that the illumination area of
As shown in FIG. 17(c), the entire frame of either channel (FFA or FF) can be projected onto the screen 1 along with the search mark M.

As can be seen from the above example of the reader printer, the film projection device of the present invention controls the position of the C lens so that the search mark M does not deviate from the illumination area even if the film F moves in the width direction, and also controls the position of the C lens so that the illumination area Even if the exposure lamp voltage is changed, the illumination light amount is maintained approximately constant by correspondingly changing the voltage of the exposure lamp, so a bright and easy-to-see projected image can be obtained, and it is also possible to use duo film or duplex film. Even when used, the search mark sensor main body 35 can reliably detect the search mark M, making it possible to easily and quickly search for desired information and achieve the desired purpose.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that the design can be changed without departing from the scope of the invention. Since the optimal illumination area is considered to be fixed, the exposure lamp voltage for duplex film or duo film and the exposure lamp voltage for simplex film are set in advance to match the optimal illumination area depending on the type of film. The exposure lamp control section 65 may be configured to select the exposure lamp voltage to be used. Also C
It is also preferable to provide a plurality of lenses to form a C lens group, move some of them in the direction of the projection optical axis, and control them continuously. Further, in this embodiment, the film is automatically moved in the width direction, but it may be moved manually.

As described in detail above, the film projection device of the present invention has a first
The control means changes the illumination area of the film, and the second control means changes the amount of illumination light appropriately in response to the change in the illumination area, so that the illuminance on the screen does not decrease. (A bright and easy-to-see projected image can be obtained.Also, even when a duo film or duplex film is used, the illuminance near the search mark M does not decrease, so there is no possibility of erroneously detecting the search mark. This has the effect of making it suitable for information retrieval.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the overall control procedure of a reader printer as an embodiment of the present invention, FIG. 2 is a front view of the reader printer, FIG. 3 is a perspective view showing the film carrier section, and FIG. FIG. 5 is a perspective view of the search mark sensor, FIG. 5 is a diagram schematically showing the projection optical system, FIG. 6 is a perspective view of the projection lens identification sensor, FIG. 7 is a plan view of the C lens driving means, and FIG. The figure is a front view of Fig. 7, Fig. 9 is a block diagram showing the control system of the reader printer, Fig. 10 is a flowchart of C lens processing 1, Fig. 11 is a flowchart of exposure lamp processing 1, and Fig. 12. is a flowchart of C lens processing 2, FIG. 13 is a flowchart of exposure lamp processing 2, FIG. 14 is a flowchart of search processing,
Figure 15 is a flowchart of "Bch check", Figure 16 is a flowchart of film scanning processing, Figures 17 (a) to (c) are projection images projected on the screen, and Figure 18 (a). Figure 18 (b) is a plan view of the simplex film, Figure 18 (b) is a plan view of the duo film, and
Figure 8 (c) is a plan view of the duplex film, the first
FIG. 9 is a diagram showing the light amount distribution on the film surface. 6... Projection optical system, 7... Film feeding mechanism, 64
... C lens drive means control section (first control means), 6
5... Exposure lamp control section (second control means), M...
・Search mark, F...Film. Patent applicant Minolta Camera Co., Ltd. Figure 2 Figure 4 Figure 7 Figure 8 Figure 10 Figure 11 Figure 12 Figure 13 (A) FF Figure 17 (C) Figure 18 (B) 114? t-AM Figure 19

Claims (1)

[Claims] (1) A film feeding mechanism that transports the film with search marks formed on the sides of the frame in the longitudinal direction, a projection optical system that projects the image imprinted on the film, and a projection optical system that changes the illumination area of the film. 1. A film projection apparatus comprising: a first control means; and a second control means for appropriately changing the amount of illumination light in response to changes in the illumination area.