JPS6224237A - Projector - Google Patents

Abstract

PURPOSE:To retrieve an image without almost no consideration of the timing when a manual operating tool is operated by projecting automatically the overall target image on a screen by switching said tool in a film stop operating state when more than half the target image is projected on the screen. CONSTITUTION:The titled projector has a film shift means driving automatically a drive device with respect to a film feeder so that the more than half the full image projected on the screen can be completely projected on the screen at the time of detecting an stop operation where the manual operating tool is switched in the film stop operating state. Namely, only the 3rd switch S3 is closed in the state where a film feed knob 19 is positioned in the center. The feed of a microfilm F is stopped. The microfilm F is conveyed at a certain speed based on the position relationship between the screen 4 and the microimage I with more than its half projected on the screen 4 at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to projectors such as microfilm leagues using microfilms of 16 mm or 35mm width, and movie projectors using film strips of various widths.

More specifically, it includes a projection device that projects an image imprinted on a roll of film onto a screen, and a film feeding device that feeds the film forward and backward in the longitudinal direction t and stops it by driving a drive device. The present invention relates to a projector provided with a manual operating tool for driving a drive device for the film feeding device.

[Conventional technology]

In the above-mentioned projector, the drive device for the film feeding device is driven by a manual operating tool, the film is fed in the longitudinal direction while visually observing the image projected on the screen, and when the desired image is projected on the screen, the manual operation is performed. Images can be searched by switching the operating tool to the film stop operating state and stopping the film advance. Conventionally, in such a projector, the drive device for the film feeding device is stopped immediately when the manual operating tool is switched to the film stop operation state.

[Problem that the invention seeks to solve]

However, when searching for an image as described above, the film has inertia because it is being fed at a predetermined speed. Therefore, in order to ensure that the entire target image is completely projected onto the screen, the manual operation tool must be operated accurately at a predetermined timing. In particular, as the image is projected onto a screen and the visual judgment is made to determine whether or not the image is the desired image, there is a tendency for the film stop operation using the manual operation tool to be delayed, causing the film to advance too far and cause the beginning of the desired image to be cut off. was often missing from the screen.

In addition, if the desired image is partially cut off from the screen and projected when film advance is stopped, the film must be advanced again using the manual operation tool, or the film must be conveyed separately. It was necessary to advance the film little by little by operating knobs and handles that were mechanically linked to the mechanism, making fine adjustments so that the entire desired image was projected onto the screen.

Therefore, such film feeding operations are cumbersome and
In particular, when a large number of images are searched in succession, work efficiency is extremely reduced.

In particular, in microfilm reader printers that have the function of copying projected images in addition to the function of projecting images, when copying after searching for a desired image, it is necessary to stop the film advance as described above. Sometimes, if a portion of the desired image is projected from the screen, there is a risk that not all of the desired image will be copied onto the copy paper. In such cases, particularly accurate image positioning is required.

In view of the above-mentioned circumstances, an object of the present invention is to easily display the entire target image on the screen when searching for an image by feeding the film by operating a manual operating tool and visually viewing the image projected on the screen. The goal is to be able to project.

[Means for solving problems]

A characteristic configuration of the projector according to the present invention is that a stop operation detection means is provided for detecting that a manual operating tool for driving a drive device for a film feeding device is switched to a film stop operation state, The present invention is characterized in that a film shifting means is provided for automatically driving a drive device for a film feeding device so that the entire image that has been projected on the screen at the time of detection is projected on the screen in its entirety.

[For production]

In other words, when searching for an image while visually viewing the image projected on the screen, you can automatically switch the manual operation tool to the film stop operation state when more than half of the desired image is projected on the screen. The entire target image is projected onto the screen. Therefore,
Images can be searched without much consideration of the timing of operating the manual operating tool.

Moreover, the operation of stopping the film advance when more than half of the desired image is projected on the screen is
This is a very natural action for the operator, and reduces the risk of operational errors.
1 death [Example]
I■ Below'. ·drawing'. Base 10゛7・0 Examples of the present invention
1.Explain.
j As shown in Fig. 2, a microfilm reader printer is constructed by combining a league printer body (1), a film carrier (2), a controller (3), and (1).

In this microfilm reader printer, the microfilm (F) held on the film carrier (2)
) can be switched between a reader mode in which it is enlarged and projected onto a screen (4), and a print mode in which it is enlarged and copied onto recording paper using an electrophotographic process.

Film carrier (2), which is an example of a film feeding device
As shown in FIG. 3, a supply reel (5) and a take-up reel (6) are provided inside, and both reels (5),
(6) is guided by a plurality of guide rollers (7a) to (7c) to a pair of glass plates (8a) constituting the light irradiation section (8).
, (8b), they are placed in close contact with each other. This light irradiation part (8) is connected to the film carrier (2).
is installed on the reader printer main body (1), and the light source (
9) to condenser lens (10a), (10c)
, (10d), a reflecting mirror (10b), etc., and the center thereof is arranged to coincide with the center (L) of a beam of light arriving via an optical system (10) including a reflecting mirror (10b) and the like. The light beam from the light source (9) passes through the micro-image (1) at the light irradiation section (8), and the light beam from the light source (9) passes through the micro-image (1).
) is projected onto a screen (4) via a projection device (IP) consisting of a projection lens (11), a plurality of mirrors (not shown), and the like.

The rotating shaft (
12).

(13) are respectively different motors (14) and (15
). Then, one of the motors (14) and (15) which is an example of a drive device.

(15) is configured so that the microfilm (F) can be fed in either forward or reverse direction.

Furthermore, a disc (16) having a plurality of slits is linked to one of the aforementioned guide rollers (7b) that follows the feeding operation of the microfilm (F), and a disc (16) having a plurality of slits is interlocked with the disc (16). A photosensor (17) consisting of a light emitting part (17a) and a light receiving part (17b) is provided. This disk (16) and photosensor (17) constitute a pulse encoder (PI) that outputs a pulse signal in accordance with the feeding of the microfilm (F).

In addition, the light irradiation unit (8) is equipped with a blip detector (18) that detects the so-called blip (M), which is a mark for frame search imprinted on the microfilm (F) together with the microimage (1). It is. Specifically, this prep detector (18), as shown in FIG.
Two light receiving elements (18a) and (18) provided at positions facing the blip (M) of the microfilm (F)
It consists of a detection section (b), a connector (18c) for connection with other parts, and the like.

These light receiving elements (18a) and (18b) are arranged so that when the film carrier (2) is installed in the reader printer main body (1), the light from the light source (9) becomes a blip that is darker than the base part of the film (F). ) is used to detect blips (M) based on changes in received light intensity due to interruption. As the microfilm (F) is fed, this prep detector (18) detects the blip (M).
A counter (not shown) is counted up every time a micro image (1) is detected, and the frame number of the micro image (1) at that position can be known.

Based on the output signals obtained from the pulse encoder (PH) and prep detector (18), the microfilm (F) is controlled by controlling the drive of the two motors (14) and (15) mentioned above. The target micro-image (I) is searched for and screened (
4). If you select print mode in this state, the micro image (I)
can be enlarged and copied onto recording paper.

One way to search for a target micro-image (1) is to input the frame number attached to that micro-image (2) from the controller (3), and search for the blip (M) attached to each micro-image (1). ) is sequentially counted and the film (F) is conveyed until the counted value matches the input frame number.

Another method is to operate the film advance knob (19) provided on the reader printer main body (1) to
) while transporting the film (F) at low speed, visually check the micro image (1) projected on the screen (4), and stop transporting the film (F) when the desired image (1) is projected on the screen (4). It is also done by doing. When using this method, the film (F) can be moved by returning the film advance knob (19) to the film stop operation position when more than half of the target micro-image (1) is projected onto the screen (4). The aforementioned motors (14) and (1
5) to automatically feed the film (P).

Therefore, the drive of the motors (14), (15), etc. is controlled by operating a manual operating tool such as the film advance knob (19), and the micro image (1) is retrieved while the film (F) is being advanced. When doing so, there is no need to consider the timing of the operation of this film advance knob (19).
The entire target micro-image (1) can be easily projected onto the screen (4).

Furthermore, when copying the projected micro-image (r) after searching for the target micro-image (I), it is necessary to ensure that the entire target micro-image (1) is projected onto the screen (4). Therefore, without causing the inconvenience of parts being missing on copy paper,
It is also possible to easily copy the desired microimage (1).

Next, a control system (CD) that controls the operation of the microfilm reader printer having the above configuration will be explained.

This control system (CD) is as shown in Figure 1.
:□, its main part consists of a microcomputer (1'lc). This microcomputer: (MC) input port (
PIO) to (PI3) contain voltage signals obtained by converting the currents generated in the two light-receiving elements (18a) and (18b) described earlier using separate amplifiers (20a) and (20b),
A pulse signal from a pulse encoder (PH) and status signals of three switches (Sl) to (S,), which are opened and closed according to the operation of the film advance knob (19), are input.

The states of the three switches (Sl) to (S,) mentioned above are
It is set to change as follows. With the film advance knob (19) in the center position, only the third switch (S3) is closed. At this time, the feeding of the microfilm (F) is stopped. In addition, turning the film feed knob (19) to the right or left corresponds to the operation of feeding the film (F) in the forward or reverse direction, respectively, and the conveyance speed of the film (F) can be changed according to the amount of operation. It is composed.

The first switch (Sl) is the film advance knob (19)
The microfilm (F) is closed only when it is to the right of the center, and the microfilm (F) is fed in the forward direction at this time. And this switch (Sl)
Depending on the state, which motor (14) or (15) for forward/reverse feed is to be driven is selected. The second switch (SZ) is closed when the film feed knob (19) is operated by a predetermined amount or more to either the left or right, and controls the film (F) transport speed to a constant level. It is possible to switch between low speed and arbitrary high speed.

That is, when the first switch (S,) is closed, that is, when the film advance knob (19) is turned to the right,
Microcomputer (MC) output port (P2O)
The output signal from becomes L” level, and the relay (Ryl)
is in the "OFF" state, and the relay contact (TI) remains as shown. Therefore, the motor (14) that transports the microfilm (F) in the forward direction is driven. In addition, when this switch (Sl) is in the open state, that is, when the film advance knob (19) is turned to the left, the output signal from the output port (P2O) of the microcomputer (MC) is "
The relay (Ryl) becomes "ON" and the relay contact (T1) is switched to the right side in the figure.

Therefore, the motor (15) that transports the microfilm (F) in the opposite direction is driven.

On the other hand, this film advance knob (19) is connected to a variable resistor (V
*), and the output voltage according to the amount of operation is
Analog switch (22) via absolute value circuit (21)
is input to one terminal (i) of

The other terminal (D of this analog switch (22) is
A reference voltage set to a predetermined value is input. The analog switch (22) controls the drive current control circuit (23) for the two motors (14) and (15) according to the state of the output signal from the output port (P21) of the microcomputer (MC). The input voltage can be switched between the reference voltage mentioned above and the output voltage from the variable resistor (vi).

When the film advance knob (19) is slightly turned in either the left or right direction and the switch (S2) is still in the open state, the output signal from the output port (P21) is at the "H" level. The connection of the analog switch (22) is switched to the lower terminal (j) in the figure.
A reference voltage is input to the drive current control circuit (23).

In this state, the film (F) is conveyed in either forward or reverse direction at a constant low speed.

Further, when the film advance knob (19) is further turned and the switch (S2) is closed, the microcomputer (
The output signal from the output capo (MC) (P21) is “L”.
At this time, the connection of the analog switch (22) is switched to the upper terminal (i) in the figure, and the output voltage from the variable resistor (V+*) is input to the drive current control circuit (23). In this state, the variable resistor (V*)
The drive current is either forward or reverse depending on the amount of operation of the motor (14
) or given in (15). Therefore, the microfilm (F) is fed in either the forward or reverse direction at a speed corresponding to the amount by which the film feed knob (19) is turned.

Furthermore, when the film advance knob (19) is positioned at the center while the microfilm (F) is being transported, that is, when the film advance is stopped, the output from the output port (P21) of the microcomputer (MC) is The signal changes to "H'" level. At this time, the connection of the analog switch (22) is switched to the lower terminal (j) in the figure, and the reference voltage is input to the drive current control circuit (23). In this state, a predetermined amount of drive current is applied to either the forward or reverse motor (14) or (15). Then, as explained in the rear frame, the microfilm is moved in either the forward or reverse direction based on the positional relationship between the screen (4) and the microimage (1) that is projected more than half onto the screen (4) at that time. (F) is conveyed at a constant low speed.

In addition, a microcomputer (MC) input capo)
Output signals from various input devices are input to (P2O) to (P35), and the microcomputer (MC)
The output ports (P22) to (P27) output control signals and the like to various output devices.

Next, in the micro image (1) search operation in the micro film reader printer with the above configuration, the film (P) is moved by operating the film advance knob (19).
) will be explained using the flowcharts shown in FIGS. 6 and 7.

The flowchart shown in FIG.
This is a routine for reading data between images, which is one of the subroutines that is called at regular intervals when 9) is operated to perform an image search.

When this routine is called, the forward feed flag (F
Check the status of OWFG ($110). This flag (FOWFG) is set to "l" when the film feed knob (19) is turned to the right and the microfilm (F) is fed in the forward direction. This flag (
FIFG) is set to "1", that is, when the microfilm (F) is being fed in the forward direction, (1111
), and if "1" is not set, that is, if the microfilm (F) is being fed in the opposite direction, the flow advances to step (121) and subsequent steps.

In either flow, the difference in detection timing of blips (M) for adjacent images (1) by the prep detector (18) is used as inter-image data. As explained earlier, the blip detector (18) has a detection section that includes two light receiving elements (18a).
, (18b), and these two light receiving elements (18a) and (18b) are arranged side by side along the feeding direction of the film (F) as shown in FIG.

For example, in the state shown in FIG. 5 in which the film (F) is fed to the right in the figure, the first light receiving element (18a) is
The signal outputted via a) (hereinafter, this signal will be referred to as a first signal; Psi) is at the "H" level. and,
The signal outputted from the second light receiving element (18b) via the amplifier (20b) (hereinafter referred to as the second signal; PS2) is at L" level. At this time, the transport of the blip (M) The edge on the lower side will be detected.

When the microfilm (F) is being fed in the forward direction, the second signal (PS2) is at "H" level and the first signal (Ps
i) becomes “L” level, that is, a certain blip (
When detecting the edge on the upper side of transport in the positive direction of M),
Start the counter (clouds 11-113). Next, a <film stop> subroutine for stopping the film (F) is called (114). In this subroutine, as will be explained later, the state of the third switch (S,) is checked. If this switch (S,) is not in the "ON" state, that is, if the film advance knob (19) is not in the stop operation position, the process returns without doing anything.

After that, when the second signal (PS2) becomes "H" level and the first signal (Psi) becomes "L" level, that is, (Ill
-112) The blip (M
), the counter is stopped when the edge of the blip (M) that is one step lower than 115 is detected.
11? ), and after setting the value of this counter to inter-image data (Dυ) (#30), the process returns to the main routine.

On the other hand, when the microfilm (P) is being fed in the opposite direction, when the second signal (PS2) is at "L" level and the first signal (Psi) is at "H" level, a certain blip ( When an edge on the upper side of conveyance in the opposite direction of M) is detected, a counter is started (I21 to I23).

Next, in the same way as before, the subroutine for stopping the film (F) (Film Stop) is called (12
4). If the film advance knob (19) is not at the stop operation position, it will return without doing anything as before.

- After that, when the second signal (PS2) becomes "L" level and the first signal (Psi) becomes "H" level, that is, (I2
The blip (
When detecting the edge of the blip (M) that is one step lower than M), the counter is stopped (125~
1127). After setting the value of this counter to inter-image data (0+) (J130), the process returns to the main routine.

On the other hand, the flowchart shown in FIG.
This is the (film stop) subroutine called at step ) or step (124).

When this routine is called, as explained earlier, the state of the third switch (s3) is changed to the state of the input port (PI).
3) (#51). This switch (
Ss) is closed only when the film advance knob (19) is at the film stop position, that is, at the center. And when this switch (S3) is closed,
i Microcomputer (MC) input port (P
I3) is at the "L" level.

(1151)
If 3) is determined to be at the "T" level, this means that the film advance lip (19) is at a position other than the film stop operation position, and the process returns without doing anything. On the other hand, if it is determined that the input port (PI3) is at the "L" level, it means that the film advance knob (19) has been switched to the film stop operation position, and the film (F) is stopped at the fixed position. In order to perform this, the flow advances to step (J152) and subsequent steps.

In the step (1152), the value of the counter described above at this time, that is, when the film advance lip (19) is switched to the film stop operation position, is set to the current data (opening, opening, etc.).
). Next, the output signal from the output port (P21) is set to H" level (#53). As a result, the analog switch (22) is switched in FIG.
A reference voltage is input to the drive current control circuit (23).

Therefore, regardless of whether the motor (14)
, (15) will be driven at a constant speed.

Next, the current data (Dr) is compared with -2/2 of the inter-image data (D,) obtained in the previous step (130) (+155). If the current data (OF) is larger than -half of the inter-image data (D,), it means that more than half of the micro-image (I) on the downstream side of the conveyance is projected on the screen (4). In this case,
The flow advances to steps after step (161). Furthermore, if the current data (D,) is smaller than -half of the inter-image data (0+), more than half of the micro-image (I) on the upper side of the conveyance is projected on the screen (4). . In this case, the flow advances to step ($71) and subsequent steps.

In either case, the microfilm (F) is automatically rotated forward or backward so that the entire microimage (I), of which half or more is projected onto the screen (4), is projected onto the screen (4). It is designed to be transported by crabs. In both step (1161) and step (171), the state of the forward feed flag (FOWFG) is checked.

If it is determined that the forward feed flag (FOWFG) is set to "1" in step (161), if the microfilm (F) is being fed in the forward direction and the microfilm (F) is being fed in the forward direction, This is the case when more than half of the image (I) is projected onto the screen (4). In this case,
Furthermore, in order to feed the film (F) in the forward direction, the output signal from the output port (P2O) of the microcomputer (MC) is set to the "L" level (162). After that, (11
Proceed to step 80).

Also, in step (161), the forward feed flag (FOWF
If it is determined that "1" is not set in G), the microfilm (F) is being fed in the opposite direction and more than half of the microimage (T) on the lower side of the transport is on the screen ( 4) is projected. In this case, the film (F) must be sent in the opposite direction (163). Proceed to step.

On the other hand, in step (#71), the forward feed flag (FOWF
If it is determined that 1" is set in G), the microfilm (F) is being fed in the forward direction, and
This is a case where more than half of the micro-image (1) on the upper side of the conveyance is projected onto the screen (4). In this case, the output signal from the output port (P2O) of the microcomputer (MC) is set to "H" level in order to send the film (F)'a in the reverse direction (1172). after that,(
Proceed to step 1180).

Furthermore, in step (171), the forward feed flag (FOW
If it is determined that "1" is not set in FG), the microfilm (F) is being fed in the opposite direction.
In this case, more than half of the micro-image (1) on the upper side of the conveyance is projected onto the screen (4). In this case, the film (F) should be sent in the forward direction (1173), and the output signal from the output port (P2O) of the microcomputer (?iC) should be set to the "L3 level". Proceed to.

In the step <180) and the subsequent step <(181), the two light receiving elements (18) of the blip detector (18) are
a).

(18b) is used to detect the blip (M) of the target microimage (I). In other words, the first signal (Psi
) is at “H” level and the second signal (PS2) is at “L” level, that is, when the trailing edge of the film of the blip (M) of the target micro-image (1) is detected.
Proceed to step (182).

At this time, the positional relationship between the blip (M) and the prep detector (18) is as shown in FIG.

Furthermore, in this state, the entire micro-image (1) corresponding to the detected blip (M) is displayed on the screen (4).
) is projected on.

In the step ($182), the output signal of the output port (P21) is set to L" level. As a result, the analog switch (22) is switched in FIG.
The output voltage from the variable resistor (VR) is manually input to the drive current control circuit (23) via the absolute value circuit (21). However, at this time, the film advance knob (19
) is located in the center. Therefore, the output voltage of the variable resistor (vm) is [OV].

Therefore, the input voltage to the drive current control circuit (23) is also [O
V, and no drive current is supplied to the motors (14) and (15), and the microfilm (F
) is stopped. In other words, the film (F) is stopped with the entire target micro-image (1) projected onto the screen (4).

In the previous embodiment, the film feed knob (19) linked to the variable resistor (VR) was described as an example of the manual operating tool. As the manual operation tool (19), it is also possible to use a push button, a lever, or the like. Furthermore, it is possible to make modifications such as providing a biasing mechanism that biases these manual operating tools toward the film stop operation state, or changing the transport speed of the microfilm (F) by the manual operating tools in stages. It is.

In addition, in the previous embodiment, the third switch (S,)
When the film feed knob (19) is closed, it is detected that the film advance knob (19) serving as a manual operation tool has been switched to the film stop operation position. Instead of this, for example, the following configuration is also possible.

That is, in the previous embodiment, the film advance knob (19) is linked to the variable resistor (Va), and this variable resistor (Va) is linked to the variable resistor (Va).
The output voltage of l) depends on the feeding direction of the film (F) [
OV], it could take either a positive or negative value. Therefore, by utilizing this fact, the output voltage of the absolute value circuit (21) is detected, and when this detected voltage becomes [Ov] or a predetermined microvoltage or less, the film advance knob (19) stops the film. It may also be possible to detect that it has been switched to the operating position. The voltage detection means in such a configuration and the third switch (SS) in the previous embodiment are referred to as stop operation detection means.

Furthermore, in the previous embodiment, a microcomputer (MC)
The control system (CD) whose main component is
When the film feed stop operation is detected, the counter value corresponding to the distance from the edge of the upper blip on the transport side is latched as the current data (Or), and this data (D
, ) and the adjacent micro-image (1
) and the inter-image data (DI) corresponding to the distance between
The film (F) is fed in either the forward or reverse direction based on the information on the feeding direction of It was configured to stop sending. Instead of this, the following modification is also possible.

1) Start and stop the counter by detecting the edge of the micro image (1).

2> In the case of the previous embodiment, the pulse encoder (
The pulse signal obtained from PR) corresponds to the feed amount of the film (F). Therefore, the film feeding direction is determined based on the determination when the film feeding stop operation is detected, and then the counter is added or subtracted depending on the feeding direction. When adding the counter, the counter value becomes equal to the inter-image data (D,), and when subtracting the counter, the counter value becomes “
The feeding of the film (F) is stopped when it reaches 0''.

(3) Over the entire length of the microfilm (F), set virtual coordinates corresponding to the output pulses from the pulse encoder (PI) and advance the film (F).
The output pulse from the pulse encoder (PR)
Add or subtract js. Each micro image (1
) is divided by the coordinate value corresponding to its center.

When the film advance stop operation is detected, the microfilm (P) corresponding to the center of the screen (4) is
Find the coordinate values of.

At this time, the entire micro-image (1) having the coordinate value closest to this coordinate value is projected onto the screen (4).

That is, the feeding direction of the film (P) is determined according to the sign of the value obtained by subtracting the other coordinate value from one coordinate value, and the feeding amount of the film (F) is determined according to the absolute value of that value.

Then, while feeding the microfilm (F) based on the determined information, the output pulses from the pulse encoder (PE) are added or subtracted according to the feeding direction of the film (F), and the value is determined to produce the desired microimage. When the coordinate values match (1), the feeding of the film (F) is stopped.

4) As in the case of the previous embodiment, if the film (F) is transported at a constant speed after the time when the stop operation of film feed is detected, the speed and the time when the stop operation is detected are Based on the determined required movement amount, it is possible to determine the time from that time until the entire target micro-image (1) is projected onto the screen (4). Therefore, a timer is started when a stop operation is detected, and the feeding of the film (P) is stopped when the time determined as described above has elapsed.

In other words, when the film advance stop operation is detected, more than half of the micro image (1
) to project the entire film onto the screen (4). (14) , (
As mentioned above, the configuration for automatically driving the film shifting means (
CD).

In the above embodiment, a microfilm reader printer is used, which has a mode for enlarging and projecting a microimage (I) imprinted on a microfilm (F) onto a screen (4) and a mode for enlarging and copying it onto copy paper. The present invention described above can alternatively be applied to a microfilm reader that does not have a copying function.

In addition to the microfilm reader printer described in the previous embodiment and the above-mentioned microfilm league, which targets microfilm (F) with a width of 16 or 35, the present invention can also be applied to films of various widths. It can also be applied to various types of projectors that target strips, and these are collectively referred to as projectors. In addition, microfilm (F) and filmstrip are called film (F), and microimage (1) imprinted on microfilm (F) and each image portion imprinted on the filmstrip are called images (1). to be called.

〔Effect of the invention〕

As described above, the projector according to the present invention has
When searching for an image while visually viewing the image projected on the screen, when more than half of the desired image is projected on the screen, switch the manual operation tool to the film stop operation state, and the desired image will be automatically searched. The entire image is projected onto the screen, and even if the beginning of the desired image is missing from the screen due to a delay in operating the manual operation tool, subsequent fine adjustments will be necessary. A song that disappears.

Therefore, it is possible to search for images without considering the timing of the operation of the manual operating tool, and it has become possible to search for images quickly and reliably. especially,
When searching for a large number of images in succession, the work efficiency can be greatly improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the projector according to the present invention, and the first embodiment is shown in the drawings.
Figure 2 is a circuit diagram of the control system, Figures 2 and 3 are perspective views of the inside of the film carrier, Figures 2 and 3 are front views of the microfilm reader printer, and Figure 4 is a perspective view showing the positional relationship between the prep detector and the microfilm. Figure, 5th
The figure shows blip detection.
2 is a flowchart showing part of the operation.
(2) 0. ' 7, (JL'A, I1, (4) 1.-.2.,, f'-n, (14),
(15)... Drive device, (19)...
Manual operating tool, (F)...Film, (1)...
...Image, (IF) ...Projection device, (
CD)...Film shift means, (S,)...
...Stop operation detection means.

Claims (1)

[Claims] This film feeding device includes a projection device that projects an image imprinted on a roll of film onto a screen, and a film feeding device that feeds the film forward and backward in the longitudinal direction and stops it by driving a drive device. In a projector equipped with a manual operation tool for driving a drive device for a film, a stop operation detection means is provided for detecting that the manual operation tool is switched to a film stop operation state, and when the stop operation detection means detects a stop operation, A projector provided with a film shifting means for automatically driving a drive device for the film feeding device so that the entire image projected on the screen is projected onto the screen.