JPS5816225A - Projecting device - Google Patents

Abstract

PURPOSE:To project a desired line of images correctly by providing a feeding means of feeding a recording body, on which two lines of images are recorded, forward and backward, and a projecting means of projecting a line of images at a projection optical path on a projection screen. CONSTITUTION:A film 4 and glass plates 16 and 17 are provided fixedly, and a projection lens 70 is freely movable in the width direction of the film. The projection lens 70 is moved by a solenoid to the position where the 1st or 2nd line of images of the film is projected on a screen 26. This projecting device is equipped with a lamp 14 and a diffusion plate 71 for diffusing light from the lamp 14, and both the lines of the film are lighted by the lamp 14 through a condenser lens 15 at the same time to project the lighted images upon the screen 26 through a projection lens 80 and mirrors 24 and 25. Thus, desired lines of images are projected correctly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection device for projecting a desired image on a recording medium having images recorded in at least two columns.

Films used in projection devices such as film readers or film reader printers include a film 2 on which an image 1 is recorded in one row, and a film 2 on which an image 1 is recorded in a second row, as shown in FIG.
As shown in the figure, there is a film 4 on which images 3 are recorded in two rows. m is a search mark provided on the side of each image. The shooting method for film 4 is called Duo, in which images are taken sequentially from the leading edge of the film on one side of the film, and once images have been shot on one side, the film is loaded in reverse, and images are taken sequentially from the trailing edge onto the remaining side of the film. This is a method of photographing back and forth, so to speak. In Figure 2, the left side is the leading edge of the film, and the right side is the trailing edge of the film, and this film 4 has a number attached to each image (actually, numbers are not recorded like this, but for convenience of explanation, each image is In order to search for images, search marks m are recorded on both sides of the film corresponding to each image (frame).

Conventionally, in a projection device such as a film reader or reader printer using this film 4, both sides 2
Since the images in the rows were projected onto the projection plane at the same time, it was not possible to increase the projection magnification of the desired image on one side, and the unnecessary image on the other side was also projected onto the projection plane. Therefore, it was not possible to immediately determine which side's image was the desired one.In order to eliminate the above drawback, it would be sufficient to project only the selected side's image onto the projection surface, but if the user If you change the selection (change the selection), there was a risk of making a mistake in selecting Tatsumi.

The present invention solves the above-mentioned drawbacks and allows images of a desired column to be corrected by 1-<
The present invention provides a projection device capable of projecting images.

The present invention will be explained below with reference to one specific example.

3 and 4 show a microfilm reader with a retrieval device to which the present invention is applied.

11 is supply 1J-ru, 12.13 is guide roller 14#
i A lamp for illuminating the microfilm 4 shown in FIG. 2, 15 is a condensing lens, 16.17 is a glass plate placed oppositely across the film movement path, 18 is a capster/roller,
19 is a pinch roller, and 20 is a take-up reel. A supply reel 11 and a take-up reel 20 are each connected to a film tensioning and winding motor, and a capstan roller 18 is connected to a film feeding motor (which has a torque greater than that of the film tensioning and winding motor). ing.

The microfilm 4 has a supply reel 11 and a take-up reel 20
The tape is passed between the capstan rollers 18 in forward and reverse directions, and is wound onto a take-up reel or rewound onto a supply reel.

21 and 22 are mark detectors, 23 is a projection lens, 24 is a first reflection mirror, 25 is a second reflection mirror, and 26 is a screen. The projection lens 23, mirrors 24, 25 and screen 26 are arranged at fixed positions. The image of only one row of the microfilm 4 is illuminated by the lamp 14, and the light beam transmitted through the microfilm 4 is
3, reflected by reflection mirrors 24 and 25, and illuminated toward the screen 26.
6 is enlarged and projected. Reference numeral 30 denotes a holding table, which is driven in a direction perpendicular to the feeding direction of the microfilm 4 by a drive source (not shown).

Supply reel 11, guide rollers 12, 13, glass plate 1
6.17, capstan roller 18, pinch roller 19
, the take-up reel 20, the mark detectors 21, 22, etc. are held on the Vi holding table 30 and move together with the holding table 30. The holding stand 30 is movably supported by a pair of rails 31 fixed to the main body, and is moved by a driving source in the directions of arrows a and b in FIG. within the projection optical path.

The first mark detector 21 detects the mark m provided on the side of the image in the first row of the microfilm 4, and the second mark detector 22 detects the mark m provided on the side of the image in the second row of the microfilm 4. Detect mark m. Each of the mark detectors 21 and 22 has a photoelectric conversion element, and is of a known type that outputs a high-level mark detection signal when receiving an optical signal from a mark.

In FIG. 4, reference numerals 35-36 are array detectors for detecting the position of the microfilm array placed in the projection optical path of the projection lens 23.
Turns on/off depending on the 0 position. When the first row of microfilm is placed in the projection optical path, the first row detector 3
5 detects the holder 1- and outputs a high-level first row detection signal 1-', and when the second row of microfilm is not placed in the projection optical path, the second row detector 36 detects the holder 1-'. Detects 1- and outputs a high level second column detection signal.

Fig. 5 shows a search device applied to a record reader, in which 40 is a gear board for inputting the search number (frame number) of a desired image, and 41 is a memory circuit for storing the search number input into the gear board. , 42 is an addition/subtraction counter that counts the mark detection (i1) output from the first mark detector 21 and the second mark detector 22. The detection signal is added to the count L, and when in the subtraction state, the mark detection signal is subtracted to the count L. 43 is a comparison circuit that compares the content A of the counter 42 and the content B of the storage circuit 41, and calculates A-B=C. It calculates and outputs a signal indicating the film feeding direction depending on whether the subtraction value C is positive or negative, and when the two contents match, that is, the counter 4
When the count value A of 2 matches the search number B stored in the storage circuit 41 (A-B=C=0), a stop number is output.

45 is the rearmost image on the microfilm 4 (image number [2000J in FIG. 2).

This is a trailing end detector that detects that the winding reel (200 months) has been sent to the take-up reel 20.

FIG. 6 shows an example of the trailing edge detector 45, in which the intervals between the marks m provided for each frame of the microfilm 4 are constant, and the mark detection signal output when a parenthesis mark is detected is constant. A timer 46 is provided which operates at a time interval longer than the time interval of the mark detection signal when the film is running at a predetermined speed, and the mark detector 21 or Vi2 is detected at a desired interval while the film is being fed.
While outputting the mark detection signal from 2, the timer 46
is reset, and if no mark detection signal is generated from the mark detector by the time set by the timer 46, the timer 46 outputs a high-level trailing edge detection signal. A book known as a timer can be used. 47 is the or gate.

In FIG. 5, 47 is a feeding direction changing circuit that outputs a reverse rotation signal when receiving a rear end detection signal from the rear end detector 45;
48 is a film feeding patent 11 circuit. The film feed control cap 1 circuit 48 controls the film feed motor that drives the capstan roller 18, stops the motor when a stop signal is input from the comparison circuit 43, and receives a reverse rotation signal from the feed direction conversion circuit 47. When this happens, stop the motor and then reverse it. Note that the configuration is such that a brake device (not shown) is actuated in response to a stop signal output from the comparator circuit 43 to prevent rotation of the capstan roller 18.

G, , G2-...-G, ld77)" Kate,
OR,,OI(,.

0'R, Keor Gate, 50 is a holding table movement control circuit that controls the motor that drives the holding table 3o.

The holding table movement control circuit 50 drives a motor based on a signal output from the AND gate when the AND gate G is opened, and moves the moving table 30 so that the image of the second row of microfilm is located within the projection optical path. , Ota and Gate G
, when the AND gate opens, the motor is driven in the opposite direction to the above-mentioned direction by the signal output from this AND gate, and the holding table 3 is moved so that the image of the first row of the microfilm is located in the projection optical path.
0, and when the motion detectors 35 and 36 detect the holding table while the holding table is moving, the motor stops.

The AND gates G, , G, open and close according to the output signals of the column detectors 35 and 36, and which one of the mark detectors 2
The output signal of 1.22 is selectively sent to counter 42.

AND gate q, ~G6 outputs a signal that controls addition and subtraction of counter 42.

A signal indicating the feeding direction of the film is input to the signal lines 51 and 52, and when the microfilm 4 is being fed in the VC direction in which it is wound around the winding wheel 3o (hereinafter referred to as the forward direction), the signal line 51 is inputted. A high level forward feed signal is sent to
When the microfilm 4 is being fed in the direction in which it is rewound onto the supply reel 11 (hereinafter referred to as the reverse direction), a high level reverse feed signal is sent to the signal line 52. The forward and reverse feed signals can be obtained, for example, by using a feed signal output from the comparator circuit 43 or by detecting the rotational direction of the motor that drives the capstan roller 18.

The AND gate G3 opens when the first column detection signal is input from the first column detector 35 and the forward feed signal is input, and outputs an addition signal. When the first column detection signal is input and the reverse feed signal is input, it opens and outputs a subtraction signal. Further, the AND gate G outputs an addition signal when the second column detection signal is input from the second column detector 36 and the reverse feed signal is input, and the AND gate G6 outputs an addition signal when the second column detection signal is input from the second column detector 36.
When the second column detection signal is input from 6 and the forward feed signal is input, a subtraction signal is output. The counter 42 is switched to the addition state by the addition signal, and switched to the subtraction state by the subtraction signal. In other words, the counter 42 is in an adding state when the microfilm is fed in the forward direction when the image of the first row of the microfilm is located in the projection optical path, and is in the adding state when the microfilm is fed in the backward direction. is in the subtraction state, and when the microfilm is fed in the backward direction while the image of the second column of microfilm is located in the projection optical path, it is in the addition state, and it is in the addition state when it is fed in the forward direction. When it is, it is in a subtraction state.

Next, the operation of the above device will be explained. Assume that the image of the first row of the microfilm 4 is placed on the projection optical path of the projection lens 23, and this image is projected onto the screen 26.

At this time, the counter 42 has a count value corresponding to the image number of the image projected on the screen, and
A row detector 35 detects the holding table 30 and outputs a first row detection signal. In this state, when the search number of the desired image in the second column of the microfilm 4 is input into the keyboard 40, since A-B=C>0, a forward feed signal is output from the comparison circuit 43 and the film feed control circuit A film feeding motor is driven via 48, and the microfilm 4 is fed in the direction in which it is wound onto the take-up reel 20. The first row detector 35 detects the holding base 1~, and as the film is fed in the forward direction, the AND gate q opens and the counter 42 enters the addition state, and the AND gate q1 opens and the The mark detection signal output from the 1-mark detector 21 is added up and counted by the counter 42. And the first part of the film
The image at the end of the column (image number [200(
l J ) passes the detection position of the mark detector 21, a trailing edge detection signal is output from the trailing edge detector 45, and this signal stops the film feeding motor and the film. On the other hand, the rear end detection signal opens the AND gate G.
The output signal from the AND gate (3) activates the motor for moving the holder at 1- via the holder movement control circuit 50 (7), and the holder 30 moves in the direction of arrow a, so that the two rows of microfilm are placed on the projection optical path. When the first row of detectors 35 and 30 have stopped, a reversal signal is output from the feeding direction changing circuit 47, and this reversing signal causes the film feeding motor to be controlled via the film feeding control circuit 48. is reversed, and the microfilm 4 is fed in the reverse direction.The second row detector 36
detects the holding table l~, and as the film is fed in the reverse direction, the AND gate G opens and the counter 42 enters the addition state, and the AND gate Q opens and the second mark detector The mark detection signal output from 22 is sent to counter 4.
It is added and counted at 2. During reverse movement, when the count value of the counter 42 and the search number stored in the storage circuit 41 match, a stop signal is output from the comparison circuit 43. This stop signal causes the film feeding motor to stop, the film to stop, the desired image to be placed at the projection position, this image to be projected onto the screen 26, and the search operation is completed.

Next, from this state, when the search number of the desired image in the first column is entered into the keyboard to start the search, the microfilm is fed in the forward direction, and then the trailing edge detector 45 detects the trailing edge. When the holding table 30 moves in the direction indicated by the arrow, the first row of images is placed in the projection optical path, and then the microfilm is fed in the reverse direction so that the first mark detector 21 corresponds to the desired image. When the search mark is detected, a stop signal is output from the comparison circuit 43, the film is stopped, and the desired image is searched.

In addition, if the microfilm is loaded into a predetermined feed path and the device is turned on to start, the counter 42 is reset by the signal generated when the power is turned on. Activating the holding table movement control circuit 50,
The holding stand is configured to be moved so that the image of the first row of the microfilm is located on the projection optical path no matter where the holding stand is located. According to this embodiment, the brightness and resolution of the image on the screen do not change, and the angle of view of the lens only needs to project one frame of image, so the lens is inexpensive.

The rear end detector is not limited to the above embodiments, and various known methods can be applied. For example, as shown in FIG.
The rear end of the film may be detected by providing a special mark m' with a shape different from 1 and detecting this mark m' with a detector, and the rear end of the microfilm is usually fixed to the core of the reel. Therefore, when the microfilm is fed to the rearmost edge, the film becomes stretched and the film stops being fed. This can be used to detect the trailing edge by detecting changes in the tension of the film. do not have.

Further, in the above embodiments, the film feeding mechanism and the like are moved together with the film in the film width direction, but only the film and reel may be moved in the film width direction.

7 and 8 show another embodiment of the invention, in which the projection lens is moved in the width direction of the film instead of moving the film.

This allows you to change the line of images that are projected cleanly. In FIG. 7, the film 4 and the glass plate 16, 17
etc. are provided at fixed positions, and the projection lens 70 is provided movably in the direction of the arrow, that is, in the width direction of the film. Projection lens 70
The F-j solenoid (not shown) moves the film to a position where the first or second row of images are projected onto the screen 26. The solenoid is activated by the output signal of the rear end detector 45. This is a diffusion plate that diffuses the light from the 71 lamps 14. The lamp 14 and the condenser lens 15 are arranged so that images of both rows of the film are illuminated at the same time. In this embodiment, since the lens only needs to be moved, it can be moved at high speed. In FIG. 8, the film 4, glass plates 16, 17, etc. are provided at fixed positions, and the projection lens 80
, a lamp 81 and a condensing lens 82 are provided on a movable table 83. The moving table 83 is connected to a fi 84. The solenoid 84 is actuated by the output signal of the rear end detector 45 mentioned above to move the moving table 83 to the position indicated by the broken line. When the solenoid 84 becomes inactive, the coil spring 83 moves the moving table 83 to the position indicated by the broken line.
returns to its original solid line position. When the moving table 83 is placed at the solid line position, the image of the first row of the microfilm 4 is illuminated by the lamp 81, and the illuminated image is reflected on the screen 2 by the projection lens 80 and the reflection mirrors 24 and 25.
6. When the moving table 83 is placed at the position shown by the broken line, the image of the second row of microfilm is illuminated by the lamp 81, and the illuminated image is projected onto the projection lens 80. It is projected onto a screen 26 by reflection mirrors 24 and 25. According to this embodiment, columns can be selected at high speed and good lighting effects can be obtained.

Note that the present invention can also be applied to a recording medium that does not have a search mark or a recording medium that has images recorded in multiple columns.

Furthermore, the recording medium is not limited to film, and various long-cut materials can be used.

As described above, according to the present invention, the row of desired images can be automatically positioned on the projection optical path, there is no fear of making a mistake in selecting the row, and furthermore, the desired image can be projected onto the entire projection surface. can.

[Brief explanation of the drawing]

1 and 2 are front views of a microfilm, FIG. 3 is a schematic configuration diagram of a film reader showing one embodiment of the present invention, FIG. 4 is a sectional view of the reader, and FIG. 5 is a retrieval device. A configuration diagram, FIG. 6 is a configuration diagram showing one embodiment of a rear end detector,
7 and 8 are sectional views of main parts showing other embodiments of the present invention. 4...Microfilm, 111...
Supply reel, 20... Take-up reel, 30...
...Holding stand, 35°36...Rear end detector. Applicant Canon Co., Ltd.) Y Agent Marushima Gi-11 “+””;'qj Lee1' Mao N I Otsukoku procedural amendment (voluntary) Commissioner of the Japan Patent Office Shima 1) Haruki Tono1, of the case Indication 1982 Patent Application No. 114956 2, Name of the invention Projection device 3, Relationship with the case of the person making the amendment Patent applicant address 3-30-2 Shimomaruko, University 11-ku, Tokyo Name (100) Canon Co., Ltd. Representative Kakuryu Sanbu 4, Agent Address: Canon Co., Ltd., 3-30-2, Shimomaruko, Ota-ku, Tokyo 146 (telephone: 758-2111), arinu residence 5, ``Detailed description of the invention'' of the specification subject to amendment Column and Drawing 6, contents of amendment (1) On page 5, line 10 of the specification, "one" is amended to read "selected one." (2) Same as above, page 8, line 1, ``Correct number -1 to ``signal.'' (Correction of "Long missing item" in line 15 of page 18 of the same edition as "long item". (4) Correcting Figure 8 as shown in the attached sheet.

Claims (4)

[Claims] (1) Recording images in at least two columns 1- Feeding means for feeding a recording medium in the forward and reverse directions across the projection optical path, and transferring images in the columns located in the projection optical path onto the projection plane. The recording medium is provided with a projection means for projecting images, and a detection means for detecting that the recording medium has been sent to the rear end, and when the detection means detects that the recording medium has been sent to the rear end, images of different rows are projected onto the projection optical path. A projection device characterized in that it is configured such that the projection device is placed in a position. (2) A patent characterized in that a holding means for holding the recording medium is provided, and by moving this holding means in a direction perpendicular to the feeding direction of the recording medium, the row of the recording medium to be projected on the projection plane is changed. A projection device according to claim 1. (3) The projection means has a lens that is movable in a direction perpendicular to the projection optical path, and by moving this lens, the row of recording media to be projected onto the projection plane is changed. The projection device according to item 1. (4) The projection apparatus according to claim 3, further comprising an illumination means for illuminating the recording medium, and the illumination means is moved in conjunction with the lens.