JPH07199353A - Picture projector - Google Patents

Abstract

PURPOSE:To provide a picture projector such as an OHP device by which efficient presentation is executed. CONSTITUTION:A sheet feeder 30 and a remote control transmitter are attached to the OHP device 10. The sheet feeder 30 carries a sheet to a platen glass 12 by holding the sheet between a carrying film 36 and a pressing film 38. When the page of the carried sheet is specified by the remote control transmitter, the number of pages is increased/decreased every time a page sensor 61 detects the framed part of the sheet, and carrying the sheets is kept until attaining the specified number of pages. Feeding the sheets is stopped when an obliquely advancing amount (t) detected by an oblique advancing sensor at the time of carrying the sheet exceeds an allowable amount alpha.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image projection apparatus having a sheet conveying means.

[0002]

2. Description of the Related Art Conventionally, as an image projection device for projecting an image formed on a transparent film by transmitted light or reflected light, there is, for example, an overhead projector device (hereinafter referred to as OHP device). When giving a presentation using an OHP device, the presenter arranges OHP sheets in the order of explanation in advance, and puts the sheet on the platen glass of the OHP device as the presentation progresses. I used to remove it from the platen glass.

[0003]

However, in such a conventional OHP device, there is a presenter near the OHP device, and the following problems occur because the presenter exchanges sheets one by one. It was The image of the sheet is magnified and displayed on the screen by the OHP device, but the exchange of the sheet is a troublesome task for the presenter who stands by the screen and explains, and particularly answers questions from the audience after the presentation. For this reason, it was troublesome to find out the necessary sheet from the released sheets and place it on the platen glass of the OHP device in the correct orientation. Due to such troublesome work, it was often impossible to give a presentation efficiently.

Although it may be possible to allocate personnel to replace the seat, it is still possible to eliminate the trouble, and it is necessary to perform extra operations such as a signal for seat replacement, or to waste such staff. I had to place it.

Therefore, in order to solve these problems at a stretch, the present invention aims to provide an image projection apparatus such as an OHP apparatus capable of giving an efficient presentation.

[0006]

In order to achieve the above object, the image projection apparatus of the present invention is an image projection means for projecting an image of a sheet stopped at a predetermined position, and a sheet for conveying this sheet to the predetermined position. Conveying means, location detecting means for detecting a predetermined location of the sheet transported to the predetermined position,
And a conveyance control unit that controls the sheet conveyance unit according to the predetermined position detected by the position detection unit.

Further, the image projecting apparatus of the present invention comprises an image projecting means for projecting an image of a sheet stopped at a predetermined position, a sheet conveying means for bidirectionally conveying the sheet to the predetermined position, and a sheet conveying means for conveying the sheet to the predetermined position. Set position detecting means for detecting a predetermined position of the sheet, page counting means for increasing or decreasing the number of pages according to the predetermined position of the sheet detected by the position detecting means and the conveying direction thereof, and the number of pages are set. A page number setting means, a determination means for determining whether the number of pages set by the page number setting means and the number of pages increased or decreased by the page counting means, and the sheet conveyance according to the determination result of the determination means. And a conveyance control means for stopping the conveyance of the means.

Further, the image projecting apparatus of the present invention comprises an image projecting means for projecting an image of a sheet stopped at a predetermined position, and a sheet carrying means for carrying the sheet to the predetermined position.
A spot detecting unit that detects at least two spots of the sheet conveyed to the predetermined position, and a skew detection that detects the skew amount of the sheet in the conveying direction based on the at least two spots detected by the spot detecting unit. And a transport control unit that controls the sheet transport unit according to the skew amount detected by the skew detection unit.

[0009]

In the image projection apparatus of the present invention, the image of the sheet stopped at the predetermined position is projected by the image projection means, the sheet is conveyed to the predetermined position by the sheet conveying means, and is conveyed to the predetermined position by the position detecting means. A predetermined position of the sheet is detected, and the sheet transfer unit is controlled by the transfer control unit according to the predetermined position detected by the position detection unit.

Further, the image projection apparatus of the present invention projects the image of the sheet stopped at a predetermined position by the image projection means, and when the sheet conveying means conveys the sheet bidirectionally to the predetermined position, the position detecting means. Detecting a predetermined position of the sheet conveyed to the predetermined position by means of the page detecting means, and increasing or decreasing the number of pages by the page counting means in accordance with the predetermined position of the sheet detected by the position detecting means and the conveying direction thereof. The number of pages is set by the discriminating means, the discriminating means discriminates whether the number of pages set by the page number setting means coincides with the number of pages increased or decreased by the page counting means, and the conveyance control means discriminates the result of the discriminating means. Accordingly, the conveyance of the sheet conveying means is stopped.

Further, the image projection apparatus of the present invention projects the image of the sheet stopped at a predetermined position by the image projection means,
When the sheet conveying means conveys the sheet to the predetermined position, the position detecting means detects at least two positions of the sheet conveyed to the predetermined position, and based on the at least two positions detected by the position detecting means, The skew detection unit detects the skew amount of the sheet in the transport direction, and the transport control unit controls the sheet transport unit according to the skew amount detected by the skew detection unit.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the image projection apparatus of the present invention will be described with reference to the drawings.

[Structure of OHP Device 10] FIG. 1 is a schematic view showing the structure of the sheet feeder 30 mounted on the OHP device 10. First, the configuration of the OHP device 10 will be briefly described. The OHP device 10 has an "L" -shaped arm 10b standing upright from one of the four corners of the main body 10a.
A lens 10c is provided at the tip of b, and an opening / closing reflective mirror 10d is provided above it. A platen glass 12 is fitted on the upper surface of the main body 10a, and a halogen lamp (not shown) is attached as a light source inside the platen glass 12. The light emitted from this halogen lamp is the lens 1
The sheet 1 placed on the platen glass 12 is converged at 0c and reflected and diffused at the reflection mirror 10d.
The image of No. 5 is enlarged and projected on the screen at a position away from the main body 10a.

[Structure of Sheet Feeder 30] The sheet feeder 30 is mounted on the upper portion of the main body 10a of the OHP device 10 and continuously conveys the sheet 15 onto the platen glass 12, and the film is formed on both sides of the side plates 33a and 33b. It has a feeding section 40 and a film winding section 50. In the film winding unit 50, the feed roll 4 of the film feeding unit 40
The transport film 36 and the pressing film 38, which are integrally wound around the sheet 1, are wound by the winding roll 57 and the winding roll 59, respectively. This transport film 3
6 and the take-up roll 38 move bidirectionally between the film feed section 40 and the film take-up section 50. In addition, the sheet 15 is provided between the transport film 36 and the pressing film 38.
Is set in a state that the
Moves and is positioned on the platen glass 12. Therefore, the transport film 36 and the pressing film 38 must be made of a light-transmissive material, and polyethylene terephthalate (PET film) is used in this embodiment. The thickness of the pressing film 38 is the same as that of the transport film 3.
It is thinner than the thickness of 6. Feeding roll 4
1. A tensioner 43 and paper feed rollers 51 and 52 are provided between the take-up rolls 57 and 59. The tensioner 43 stretches the transport film 36 and the pressing film 38. The paper feed roller 52 is biased toward the paper feed roller 51 by a spring (not shown).

Further, the sheet 1 is attached to the film winding section 50.
A tray 54 on which the 5 is placed is provided. The tray 54 is swingable around a rotation shaft 57a of a winding roll 57 by a cam 54a and a cam follower 54b provided in the middle. When the cam 54a rotates in the direction of arrow c in conjunction with a lever (not shown), the scoop portion 54e on the front end side of the tray 54 presses the transport film 36 once and then scoops the sheet 15 placed on the transport film 36. Take action. A "F" -shaped member 54f is swingably provided in front of the tray 54, and a sheet is detected by a transmissive sheet sensor 54c disposed on one side of the displacement of the member 54f. 1
It is determined whether or not 5 is placed on the tray 54. Behind the tray 54 is a transmissive sheet R sensor 56.
Is provided to detect whether the sheet 15 is in the vertical direction or the horizontal direction. A page sensor 61 is attached to the side plate 33a, and its detection surface is directed toward the platen glass 12 to detect an edge portion 15a of the sheet 15 described later. The page sensor 61 is a reflection type sensor and uses the amount of reflection of projected light as an output signal.

In the film winding section 50, a sheet position sensor 64, which is a transmission type optical sensor, a model number setting switch 68, which is a rotary switch for setting the machine number of the OHP device, and a remote control transmitter, which will be described later, are also provided. A remote control receiver 67 for receiving an infrared signal emitted from 201, a timer setting display unit 69 to which a time setting switch 122b and a display unit 122a are attached to notify the setting of the announcement time and the remaining time are provided. Further, skew sensors 130a and 130b are provided at positions facing the sheet feeding roller 51. The skew sensors 130a and 130b are reflection type sensors having a light emitting diode and a photodiode, and detect the front end of the sheet 15 from the reflection amount of the light projected toward the sheet feeding roller 51. At this position, the sheet 15 is fed by the sheet feeding rollers 51 and 52.
It is a position where it is sandwiched while being pressed between the transport film 36 and the pressing film 38 by. Further, a path changeover switch 127 for changing over the sheet 15 in either the winding direction or the feeding direction (pass) is provided in conjunction with the lever (see FIG. 4).

[Drive System of Sheet Feeder 30] FIG. 2 is a sectional view of the sheet feeder 30 as seen from the direction of arrow A in FIG. The film take-up unit 50 takes up the take-up roll 57 for taking up the transport film 36, the take-up roll 59 for taking up the pressing film 38, the paper feed rollers 51, 5 as described above.
2. A winding motor 62 and a transmission mechanism 65 are provided. The winding motor 62 is composed of a stepping motor, and its output shaft has a pulley 57c of the winding roll 57.
A gear 63 that meshes with is attached. Pulley 57
c is press-fitted into one end of the roll cylinder 57d, and the pulley 57b is press-fitted into the other end of the roll cylinder 57d. As the central axis of the roll cylinder 57d, the roll shaft 57a is the pulley 57.
b and 57c are pivotally supported and fixed to the side plates 33a and 33b.
With such a structure, as the winding motor 62 rotates, the roll cylinder 57d rotates and winds the transport film 36 around it.

The transmission mechanism 65 includes a transmission shaft 75 and a pulley 75.
A combination of a and a one-way gear 76, and a pulley 75a pivotally supported by the transmission shaft 75 is belted between the pulley 75a pivotally supported by the output shaft of the winding motor 62. As a result, the power of the winding motor 62 is transmitted to the one-way gear 76 pivotally supported by the transmission shaft 75. Further, a torque limiter 59f is attached to a gear 59e pivotally supported by a roll shaft 59a, which is the central axis of the roll cylinder 59. The gear 59e meshes with the one-way gear 76 to output the output of the winding motor 62. It is transmitted to the roll shaft 59a. Pulleys 57c and 57d are press-fitted into the roll cylinder 59d similarly to the roll cylinder 57d. Roll axis 5
9a pivotally supports pulleys 57c and 57d, and side plates 33a and 3d.
It is rotatably attached to 3b. With this structure, when the rotation of the winding motor 62 is also transmitted to the roll cylinder 59d, the roll cylinder 59d winds the pressing film 38. Here, the peripheral speed of the roll cylinder 59d is the roll 5
Since the reduction ratio of the transmission shaft 75 is set to be higher than the peripheral speed of 7d, the pressing film 38 and the transport film 36 can be wound and sent out without being displaced from each other. Further, the brake plate 64 urged by the brake spring 63 comes into surface contact with the pulley 59c, and prevents the pressing film 38 wound by the frictional force from sagging. Similarly, the roll shaft 51a of the paper feed roller 51 is
Is fixed to the side plates 33a and 33b, and the pulley 51
b and 51c are pivotally supported by the roll shaft 51a. Pulley 51
b and 51c are press-fitted inside both roll cylinders 51d.

On the other hand, the film feeding section 40 includes the feeding roll 41, the tensioner 43, the feeding motor 42 and the like as described above. A roll shaft 41a, which is a central shaft of the feed roll 41, is fixed to side plates 33a and 33b, and pulleys 41b and 41c are pivotally supported. Pulley 41b,
41c is press-fitted inside the roll cylinder 41d. A gear 41e is formed on the back of the pulley 41c and meshes with a gear 44 attached to the output shaft of the feed motor 42. With such a structure, the roll cylinder 41d can feed the transport film 36 and the pressing film 38 in accordance with the rotation of the feed motor 42. Also, tensioner 4
3 has a roll shaft 43a fixed to the side plates 33a and 33b and pulleys 43b and 43c pivotally supported by the roll shaft 43a.
The pulleys 43b and 43c are press-fitted inside the roll cylinder 43d, and the roll cylinder 43d applies tension to the transport film 36 and the pressing film 38.

Next, a frame mark 71 is formed for each frame (corresponding to one sheet 15) on the transport film 36 fed by the sheet feeder 30 as shown in FIG. The frame mark is formed of a material that blocks light, and when the sheet position sensor 64 detects a predetermined frame mark 71 when the frame mark 71 reaches the detection position of the sheet position sensor 64, a control described later is performed. The winding motor 62 or the feed motor 42 depends on the circuit 110.
Is stopped, and the transport of the transport film 36 and the pressing film 38 is stopped. The positioning of the sheet 15 sandwiched between the transport film 36 and the pressing film 38 on the platen glass 12 is completed by the detection of the frame mark 71.

Further, the width 15a of the sheet 15 is smaller than the width 36a of the transport film 36. this is,
When the sheet 15 is wound around the feed roll 41, the sheet 1
This is to prevent the pulleys 41b and 41c press-fitted at both ends of the roll cylinder 41d from colliding with each other due to the shift of 5. Further, an aluminum foil tape having high reflectance is attached to the front end of the sheet 15 to form an edge portion 15a. Further, the sheet position sensor 64 detects the frame mark 71 of the transport film 36 so that the central portion of the sheet 15 is positioned at the central portion of the platen glass 12. This is because I want to project the center of the sheet 15 as the center,
The OHP device 10 uses a lens to enlarge and project the image formed on the sheet 15 onto the screen to deal with the phenomenon that the periphery of the screen becomes relatively dark and it is difficult to clearly project the image. This is because

Further, the skew sensors 130a, 130a described above are used.
0b is provided in one row in the width direction perpendicular to the conveyance direction of the sheet 15, and outputs a signal that changes depending on the edging portion 15a of the sheet 15 through which the reflection amount of the light projected toward the side surface of the sheet feeding roller 51 passes. To do. Further, the above-mentioned page sensor 61 is attached to the side plate 33a, and similarly detects the edging portion 15a of the sheet 15 passing therethrough and outputs a signal. This signal contributes to increase or decrease in the number of pages.

[Structure of Control Circuit] FIG. 4 shows the structure of the control circuit 110 for driving the sheet feeder 30. The control circuit 110 is built in the sheet feeder 30.
The signal line 113 is also connected from the control circuit 110 to the OHP drive circuit 170 built in the main body 10a of the P device 10. The control circuit 110 is a well-known CPU, ROM, R
In addition to the AM and the input / output port, a one-chip microcomputer 115 including a timer counter 115a, a page position memory 115b and the like is mainly configured. The one-chip microcomputer 115 includes a remote control receiving circuit 118 that receives an infrared signal from a remote control transmitter 201, which will be described later, a time setting switch 122b that sets the time of the timer setting display unit 69 described above, and a model number that sets a model number. The setting switch 68 and the sheet 15 placed on the tray 54
A sheet sensor 54c for detecting the presence or absence of a sheet, a sheet R sensor 56 for detecting the vertical or horizontal direction of the sheet, a sheet position sensor 64 for detecting the position of the frame mark 71 of the transport film 36, and a sheet for either sheet feeding or discharging. 15
Path switch 127, seat 1
The skew sensors 130a and 130b for detecting skew 5 and the page designation switch 132 for designating the number of pages and the page sensor 61 are connected as input means. The timer counter 115a measures the time difference by starting the timer by an interrupt process activated by a signal from one of the skew sensors 130a and 130b and stopping the timer by a signal from the other. This time difference is used as a skew feeding amount t in a skew feeding amount measuring routine described later.
The page position memory indicates the current number of pages of the sheet 15, and the number of pages is increased or decreased based on the output signal of the page sensor 64 and the conveyance direction of the sheet 15.

As shown in FIG. 5, the timer setting display section 69 has a display section 122 in addition to the time setting switch 122b.
a, a count start key 122c, a count stop key 122d, a timer ON / OFF key 122e, and a buzzer 122f are provided. Timer ON / O
The FF key 122e sets whether to use the timer function. Each time it is pressed, it switches between ON and OFF. The time setting switch 122b is set to 9 for setting the presentation time.
It can be set up to 9 minutes and 59 seconds. When the count start key 122c is pressed, the countdown starts and the remaining time is displayed on the display unit 122a. When the count stop key 122d is pressed midway, the operation is temporarily stopped, and when the count start key 122c is pressed again, the countdown is restarted.

The page designating switch 132 is for the presenter to manually set the number of pages, but it can also be set by the remote control transmitter 201 as described later.

As shown in FIG. 6, the remote control receiving circuit 118 includes a light receiving unit 121, a buffer 123, and a processing circuit 1.
25 and a clock circuit 128. When an infrared signal output from a remote control transmitter 201 described later is received by a plurality of light receiving units 121, it is converted into a serial electric signal. The converted electrical signal is the buffer 123
Is input as serial data to the processing circuit 125 via. The processing circuit 125 takes in serial data according to the timing clock from the clock circuit 128, converts the taken serial data into parallel data, and outputs the parallel data from the output port 126.
As shown in FIG. 7, the light receiving unit 121 includes a photodiode 141, an amplifier 142, a limiter 143, a bandpass filter 144, a demodulator 145, an integrator 146, and a comparator 147. The photodiode 141 converts the infrared signal into an electric signal, and the amplifier 142 amplifies the electric signal. Limiter 1 for amplified electrical signals
The amplitude is limited by 43, only the signal component of a specific frequency is extracted through the band pass filter 144, and then demodulated by the demodulator 145. When the waveform of the demodulated signal is shaped by the integrator 146, the comparator 147 outputs only a signal of a certain level or higher.

Light receiving unit 121 having such a configuration
Are incorporated in three places of the remote control receiver 67, and the light receiving unit drive circuit 151 for driving the motor 158 of the light receiving unit 121 is connected to the one-chip microcomputer 115. FIG. 8 is a perspective view showing the mechanical configuration of the light receiving unit 121. The light receiving portion 153 is attached to the circular substrate 152 attached to the central axis of the rotatable cylindrical pointing rod 151, and the signal line 155 connected to the connector 154 of the light receiving portion 153 passes through the inside of the pointing rod 151. It is input to the remote control receiving circuit 118 described above. The pulley 156 is rotatably supported by the indicator rod 151, and when a certain torque is applied to the pulley 156 when the indicator rod 151 is locked and cannot rotate, the pulley 156 slips from the indicator rod 151 and only the pulley 156 rotates. It has a structure that A belt 157 is wound around the pulley 156 and the output shaft of the motor 158, and the pulley 156 rotates with the motor 158. In addition, the circular substrate 152
A stopper 159 is attached to a fixing member (not shown) on the surface of (1), and the stopper 159 allows the circular substrate 152 to make one forward and reverse rotation.

Further, constant current circuits 131 and 133 for driving the feed motor 42 and the winding motor 62, respectively, are connected to the one-chip microcomputer 115 as output means. The feed motor 42 and the take-up motor 62 are stepping motors, and are composed of four-phase pulse signals A, A *,
Driven by B and B *. That is, by shortening the cycle of cyclically outputting these four-phase pulse signals (A → A * → B → B *), the rotation of the stepping motor becomes faster, and the reverse rotation cyclic (A * → A → B *
→ By outputting to B), the stepping motor rotates in reverse. Further, the display unit 122a provided on the timer setting display unit 69 and the voice output unit 122h of the buzzer 122f are connected to the one-chip microcomputer 115 as output means.

In addition, the one-chip microcomputer 115 has O
The HP drive circuit 170 is connected. The OHP drive circuit 170 is an ON / O switch for the halogen lamp in the OHP device body.
The FF controls the adjustment of the illumination intensity and the movement of the lens.

[Configuration of Remote Control Transmitter 201] FIG. 9 shows the appearance of the remote control transmitter 201, and FIG. 10 shows the internal circuit configuration. Remote control transmitter 201 has multiple keys 2
09 (B0 to B11, F0 to F10) and the display unit 20
Have eight. The key 209 is attached to the conductive rubber laid on the keyboard substrate. A processing circuit 202 including a memory 202a and a clock circuit 20 on the keyboard substrate.
4, a laser oscillation circuit 207 is mounted in addition to the transmission circuit including the battery 205 and the LED circuit 206.
When the key 209 is pressed, the conductive rubber is pressed against the key matrix portion 203 of the keyboard substrate to conduct electricity, and it is determined which one of the plurality of keys 209 has been pressed in the processing circuit 202. A code that does not overlap with other keys is assigned to each key 209 in advance. The code signal of the key 209 pressed by the processing circuit 202 is converted into serial data, and the LED circuit 206 converts the electric signal into an infrared signal and transmits the infrared signal. Further, the remote control transmitter 201 is the OHP device 10
As a receiver, the machine number can be set, and only a specific OHP device can be controlled from a plurality of OHP devices. Use the numeric keys (F0-F9) on the keys 209 to set the machine number, and press the set key (F1
When 0) is pressed, the machine number is stored in the memory 202a of the processing circuit 202. At the same time, the set machine number is displayed on the display unit 208. When the keys (B1 to B11) are pressed, as shown in FIG. 11, the machine number code corresponding to the machine number stored in the memory 202a, the data code for controlling the operation, and the other remote controller transmitter when there are a plurality of remote controller transmitters are displayed. The system code for identifying the remote control transmitter and the extension code used when the function is extended are transmitted. When the OHP device 10 receives these codes, it judges the machine number code, and only when it matches the machine number preset by the machine number setting switch 68, the OHP device 10 operates according to the next data code. Further, when the key (B0) is pressed, the laser oscillation circuit 207 operates and emits the laser only while the laser pointer is pressed. No code has been specifically assigned to remotely control the laser pointer.

The transmission code serially output from the remote control transmitter 201 is 15 bits C1 to C14,
As described above, the system codes C1 to C5, the machine number codes C6 to C9, the data codes C10 to C15, and the extension codes C12 to C14 of the data codes are included. The system codes C1 to C5 are written in the built-in ROM of the one-chip microcomputer 115 on the OHP device 10 side corresponding to the remote control transmitter 201. Also,
Input the page you want to project with the ten keys (F0-F9) of the remote control transmitter 201 and press the page set key H0.
A code signal corresponding to the number of pages is transmitted. When this is received by the remote control receiving circuit 118, the number of pages input to the page designating switch 132 of the OHP device 10 is set.

FIG. 12 shows the machine number set in the remote control transmitter 201 and the machine number code transmitted accordingly. As mentioned above, the machine number setting switch 6
When the machine number set by 8 and the received machine number code match, the OHP device 10 operates according to the data code. When the machine number of the remote control transmitter 201 is set to "0", all OHP devices can be operated regardless of the set machine number. That is, the control circuit 110 determines whether or not the machine number codes C6 to C9 are designated by a combination of three bits "0". FIG. 13 shows data codes C10 to C15 set when the keys B0 to B11 among the keys 209 of the remote control transmitter 201 are pressed. 14
Is the light receiving unit 12 of the remote control receiving circuit 118 which described the serial signal output from the remote control transmitter 201.
1 shows reception data that is converted into a parallel signal by the processing circuit 125 when it is received by 1 and its function. For example, when the one-sheet feed button B1 is pressed, the sheet feeder 30 feeds one sheet 15 and returns one sheet 15 by pressing the one-sheet return button B2. In addition, the fine adjustment feed button B
3 is used to move the position of the sheet 15 to the feed side, and the sheet 15 moves only while being pushed. The fine adjustment return button B4 is used to move the position of the seat 15 to the return side,
The sheet 15 moves only while it is being pressed. When the sheet discharge button B5 is pressed, the sheet 15 is discharged, and when the preset button B6 is pressed, the sheet 15 is rewound to the first sheet 15. When the stop button B7 is pressed, one sheet is fed and sheet discharge or preset is interrupted.

[Operation of Sheet Feeder 30] Next, the basic operation of the sheet feeder 30 will be described. When the power is turned on, the path changeover switch 127 provided on the body of the sheet feeder 30 is set to the sheet set path. When the preset button B6 of the remote control transmitter 201 is pressed with the sheet set path set,
The one-chip microcomputer 115 outputs a phase switching signal of a constant cycle to the constant current circuit 133 to drive the winding motor 62 with a constant current. Conveying film 36 and pressing film 38
Starts rewinding by the rotation of the winding motor 62,
When the sheet position sensor 64 detects the frame mark 71 indicating the end of rewinding, the drive of the winding motor 62 is stopped. Next, when one sheet 15 is set on the tray 54, the sheet sensor 54C detects the presence of the sheet 15, and the one-chip microcomputer 115 receives the constant current circuit 1 upon receiving the detection signal.
A phase switching signal of a constant cycle is output to 31 and the feed motor 42
Constant current drive. The feed film 42 and the pressing film 38 are again fed by the feed motor 42 to the feed roll 41.
Although the sheet 15 is moved to the side, the sheet 15 set on the tray 54 at this time is sandwiched between the conveying film 36 and the pressing film 38 by the sheet feeding rollers 51 and 52.
The sandwiched sheet 15 moves in a layer with the transport film 36 and the pressing film 38 to move to the platen glass 1
When it reaches 2, the frame mark 71 formed on the transport film 36 is detected by the sheet position sensor 64, and the driving of the feed motor 42 is stopped. After that, the next one sheet 15 is set on the tray 54, and the same thing is repeated. When the last sheet 15 is set and the driving of the feed motor 42 is stopped by the sheet position sensor 64, the preset button B6 of the remote control transmitter 201 is pressed again, and the remote control reception circuit 118 is pressed.
A preset command is input to the one-chip microcomputer 115 via. The one-chip microcomputer 115 is a constant current circuit 1
The winding motor 62 outputs the phase switching signal of a constant cycle to the motor 33.
Is driven with a constant current. As a result, the transport film 36 and the pressing film are again moved to the respective rollers 57 and 59.
The sheet 15 is rewound into the tray scoop portion 54 at the same time.
They are scooped up by e and placed on the tray 54 in order. When the driving of the winding motor 62 is stopped, the setting of the sheet 15 is completed.

Next, when the one-sheet feed button B1 of the remote control transmitter 201 is pressed, a one-sheet feed command is input to the one-chip microcomputer 115 via the remote control reception circuit 118. The one-chip microcomputer 115 is a constant current circuit 131
A phase switching signal having a constant cycle is output to drive the feed motor 42 with a constant current. Conveying film 36 and pressing film 3
One sheet 15 sandwiched between 8 is platen glass 1
When the sheet position sensor 64 detects that the sheet is fed above the sheet 2, the driving of the feed motor 42 is stopped.
As a result, one sheet 15 is positioned on the platen glass 12, and the image formed on the sheet 15 is OH.
It is projected on the screen by a halogen lamp built in the main body 10a of the P device 10. By this repetition,
The sheet 15 can be continuously projected from the first sheet to the final sheet.

When the one sheet return button B2 of the remote control transmitter 201 is pressed, a command for returning one sheet is input to the one-chip microcomputer 115 via the remote control receiving circuit 118. Similarly to the above, the one-chip microcomputer 115 outputs a phase switching signal of a constant cycle to the constant current circuit 133 to drive the winding motor 62 with a constant current. When the sheet position sensor 64 detects that one sheet has been returned, the drive of the winding motor 62 is stopped. As a result, the previous sheet 15 can be projected.

Further, when it is desired to slightly shift the position of the sheet 15 set on the platen glass 12 in the feed direction, the fine adjustment feed button B3 of the remote control transmitter 201.
When is pressed, a command for fine adjustment feed is input to the one-chip microcomputer 115 via the remote control receiving circuit 118. The one-chip microcomputer 115 outputs a phase switching signal of a constant cycle to the constant current circuit 131 for a short period of time to drive the feed motor 42 with a constant current. Similarly, when the fine adjustment return button B4 of the remote control transmitter 201 is pressed, a fine adjustment return command is input to the one-chip microcomputer 115 via the remote control reception circuit 118.
The one-chip microcomputer 115 outputs a phase switching signal of a constant cycle to the constant current circuit 133 for a short period of time to output the winding motor 6
2 is driven with a constant current. Both the fine adjustment feed and the fine adjustment return commands drive the feed motor 42 and the winding motor 62 only while the fine adjustment feed button B3 and the fine adjustment return button B4 are being pressed. The cycle of the phase switching signal for fine adjustment feed and fine adjustment return is set longer than that for single feed and single return, and the transport speed for single feed and single return is smaller than that for fine adjustment and fine return. It's getting faster. When the stop button B7 of the remote control transmitter 201 is pressed while the sheets 15 are being fed or returned one by one, a stop command is input to the one-chip microcomputer 115 via the remote control receiving circuit 118 and the feed motor 42 Alternatively, the drive of the winding motor 62 is stopped.

When the sheet 15 is discharged to the outside of the machine, first, the path changeover switch 127 is set to the discharge side and the sheet discharge button B5 of the remote control transmitter 201 is pressed, and the one-chip microcomputer 115 is passed through the remote control receiving circuit 118. Sheet discharge command is input. As a result, the one-chip microcomputer 115 outputs a phase switching signal of a constant cycle to the constant current circuit 133 to drive the winding motor 62 with a constant current,
The sheets 15 are discharged one by one out of the machine. The above-described control such as reading of each sensor and each switch through the remote control receiving circuit 118 by the one-chip microcomputer 115 and output of a phase switching signal to the constant current circuits 131 and 133 is built in the one-chip microcomputer 115. It is executed by the program of the processing procedure stored in the ROM.

[Rotating Operation of Light-Receiving Unit 121] Next, FIG. 15 shows the operation of the light-receiving unit 121. OHP
At the same time when the power of the device 10 is turned on, the control circuit 110 causes the motor 158 to rotate forward through the receiving unit drive circuit 151 (step S310). The motor 158 has a light receiving portion 15
Energization is performed for T seconds, which is a time sufficient for the 3 to make one rotation. A circular substrate 152 that is driven by a motor 158 to rotate.
Since the rotation is restricted by the stopper 159, it stops at a position where it hits the stopper 159, and only the pulley 156 idles in accordance with the rotation of the motor 158. After T seconds have passed, this time, the motor is energized in the opposite phase for the same T seconds to rotate the motor 158 in the opposite direction. After that, the same operation is repeated until the light receiving unit 153 receives the infrared signal (step S315). The rotation of the motor 158 is stopped at the moment when the light receiving unit 153 receives the infrared signal (step S320). At the stop position, the light receiving unit 153 receives the subsequent infrared signal, and the control circuit 110 executes the corresponding process (step S330). As a result of processing,
System code C1 to C5, machine number code C6 to C9
If they match, the control according to the data codes C10 to C15 is executed (step S345), but if they do not match, the control is not executed (step S34).
0). If the light receiving unit 153 remains for a set time sufficient to execute the control, this routine is once ended (step S350). When the routine is started again, the rotation of the light receiving section 153 is restarted in step S310. In this way, by stopping the rotation of the motor 158 and directing the light receiving unit 153 toward the remote control transmitter 201, the next infrared signal can be quickly caught. As described above, the light receiving unit 1
Since 21 has a mechanism for rotating the light receiving unit 153, the infrared signal from the remote control transmitter 201 can be received over a wide range without being limited to the range of the directional characteristics of the light receiving unit 153. This leads to giving a degree of freedom to the place where the OHP device 10 is placed.

[Sheet 15 Conveying Operation] Next, the conveying operation of the sheet 15 will be described as an example of the control of the OHP device 10 shown in step S345. FIG. 16 is a flowchart showing the operation of conveying the sheet 15. First, it is determined whether or not the received data D0 to D3 is in the single-sheet feeding mode (step S560), and when it is in the single-sheet feeding mode, the sequence control of the single-sheet feeding operation is performed to set the sheet 15 on the platen glass 12 to 1 Sheets are sent (step S580). If it is not the one-sheet feeding mode, it is judged whether it is the one-sheet returning mode (step S570). If it is the one-sheet returning mode, the sequence control of the one-sheet returning operation is performed and one sheet 15 is placed on the platen glass 12. It rewinds and this routine is once ended (step S590).
If it is not the one-sheet return mode, it is further determined whether or not it is the fine adjustment mode (step S610). If it is the fine adjustment mode, the fine adjustment operation sequence control is performed and this routine is once ended (step S630). If it is determined that the mode is not the fine adjustment mode, it is further determined whether or not it is the sheet discharge mode (step S620). If it is the sheet discharge mode, the sheet discharge operation control sequence is performed (step S640), but if it is not the sheet discharge mode. This routine is temporarily terminated as it is. Thus, the sheet 15 can be moved slightly by using the fine adjustment mode.

[Measurement of Skew Amount] Next, a skew amount measurement routine will be described. This is executed in the one-sheet feeding operation sequence described above. FIG. 17 is a flowchart showing a skew amount measurement routine. When the edging portion 15a of the sheet 15 placed on the transport film 36 passes the skew sensors 130a and 130b, the amount of reflection increases at the edging portion 15a to which the aluminum foil tape is attached, so the skew sensors 130a and 130b. Is shown in FIG.
A signal waveform with a steep rising edge is output as shown in. FIG. 18 shows the case where the sheet 15 is skewed to the skew sensor 130a side. One-chip microcomputer 1
15 is a timer counter 115 depending on the rising edge of the previous signal of the two skew sensors 130a and 130b.
The time measurement of a is started, and the time measurement is ended by the rising edge of the signal thereafter. The absolute value of the measured time difference is calculated as the skew feeding amount t (step S710). Further, it is judged whether or not the skew feeding amount t exceeds the allowable amount α (step S720), and when it exceeds the feeding amount α, the feed motor 42 is temporarily stopped and then the winding motor 62 is driven to drive the sheet 15.
Is rewound (step S730). On the other hand, when the skew feeding amount t does not exceed the allowable amount α, the sheet 1 is directly used.
Continue sending 5.

[Page Control] Next, page control will be described. The one-chip microcomputer 115 clears the value of the page position memory 115b to "0" when the above preset is completed. When one sheet 15 is fed, the page sensor 61 detects the edge portion 15a of the sheet 15. With this detection signal, the one-chip microcomputer 115 increments the value of the page position memory 115b.
When one sheet is returned, the conveyance direction is opposite, so the value of the page position memory 115b is decremented. FIG. 19 is a flowchart showing the page control routine. This routine is repeatedly executed. First, it is determined whether or not the page number is designated in the page designation switch 132 manually or by the remote control transmitter 201 (step S81).
0). If not specified, this routine is once ended. When it is designated, it is determined whether the designated number of pages matches the number of pages stored in the page position memory 115b (step S820). If they match,
This routine is temporarily terminated because the sheet 15 currently projected may remain as it is. When they do not match, it is determined whether or not the page of the sheet 15 currently projected is over the specified page (step S83).
0). When it is determined that the sheet has passed too much, the sheet winding control sequence is executed (step S840), and is executed until the specified page is reached (step S85).
0). On the other hand, when the current page has not reached the designated page, the sheet feeding control sequence is executed (step S860), and the sheet is fed to the designated page (step S870).

[Timer Function] Next, the control circuit 110
The timer function executed by will be described. FIG. 20 is a flowchart showing the timer function. This routine is repeatedly executed by the control circuit 110. First, the timer ON / OFF key 122e is turned ON.
If the count start key 122c is pressed, the time setting switch 122b determines whether the presentation time is set (step S41).
0), if not set, this routine is once terminated. If it is set, the remaining time of the time set by the time setting switch 122b is displayed on the display unit 122a (step S420). The remaining time is displayed every 5 minutes (step S430), and 5 minutes before the end of the presentation, the buzzer 122f is sounded only once to inform the presenter of the time (step S440). The display is lit up indicating that the remaining time has reached 5 minutes ago (step S4
45) When the set time is reached (step S450), the buzzer 122f is sounded twice and the display section 122a is displayed in a blinking manner to notify the presenter that the end time has come (step S460). When the count stop key 122d is pressed midway, the control circuit 110 suspends this routine by interrupt processing and saves the state up to that point in the RAM built in the one-chip microcomputer 115.
When the count start key 122c is pressed again, the state immediately before the stop is resumed. In this way, the presenter can be given time to give a presentation effectively by notifying the presenter of the passage of time by the sound of the buzzer 122f and the change in the display.

As described above, in this embodiment, the skew amount t of the sheet 15 conveyed by the skew sensors 130a and 130b is detected before the sheet 15 is positioned on the platen glass 12, It is possible to prevent the sheet 15 from being placed on the platen glass 12 while being skewed and projecting an inclined image on the screen.

When the sheet feeder 30 automatically feeds the sheet 15 and stops the sheet 15 at a predetermined position on the platen glass 12, the sheet 15 is conveyed by being sandwiched between the conveying film 36 and the pressing film 38 and conveyed. The sheet 15 can be held and conveyed at a fixed position with respect to the conveying film 36 without being affected by disturbances such as resistance and wind, and the end portion of the sheet 15 does not float on the platen glass 12. . Since both sides of the sheet 15 are wrapped, the sheet 15 can be conveyed in a protected state without being damaged.

Further, according to the present embodiment, the remote control transmitter 201 is used to control the equipment related to the presentation of the OHP device 10, for example, the opening / closing of the curtain and the ON / OFF control of the lighting equipment. , The presenter can multi-control while being at the side of the screen for more effective presentation.

Further, since the presentation time and the like are set by remote control with the remote control transmitter 201, the presenter can easily operate even from a place standing beside the screen. Further, the light receiving unit 153 provided in the sheet feeder 30 has directivity, and even if the OHP device 10 is placed in a place where the optical signal from the presenter is hard to reach depending on the direction, the light receiving unit 153 is driven by the motor 158. Since 153 rotates, the presenter's remote control transmitter 201
The optical signal from can be easily received. further,
When operating a plurality of OHP devices 10, it is determined that the model number set by the model number setting switch 68 and the model number transmitted by the remote control transmitter 201 match. Therefore, a plurality of OHP devices 10 are arranged. They can be selectively and efficiently operated. In this way, an efficient presentation can be performed by multi-control using the remote control transmitter 201.

[Other Remote Control Transmitter 601] FIG. 21 shows the configuration of another remote control transmitter 601. The configuration is almost the same as that of the remote control transmitter 201 described above, but only different parts will be described. The remote control transmitter 601 is additionally provided with four keys (D0 to D3) such as a time setting key D0, and a buzzer 610 is attached to the front. In addition, the ten keys (C0 to C9) have been upgraded, and the timer time can be set with four digit numbers using the ten keys (C0 to C9). Display unit 608
Of these, the first two digits represent the fraction and the next two digits represent the number of seconds. When you first enter a number with the numeric keypad, that number is displayed in the lowest digit of the display. Next, when a number is entered with the ten keys, the first entered number is shifted to the next digit of the display and displayed, and the second entered with the ten key is displayed in the lowest digit. When you enter the number with the ten-key pad for the third time, the two-digit number that has already been displayed is shifted to the next place and displayed. Similarly, if the time setting key D0 is pressed after inputting a four-digit number, a code signal indicating this is transmitted. At the same time, the buzzer 610 sounds and notifies that it has been transmitted. In addition, the remote control transmitter 6
When the OHP device 10 receives the transmission signal from 01 through the remote control receiving circuit 118, the set time is displayed on the display unit 122a of the timer setting display unit 69. Further, the remote control transmitter 601 is provided with a timer ON / OFF key D3, which is pressed to switch between ON and OFF, and at the same time, the buzzer 601 sounds. Similarly, when the count start key D1 is pressed after setting the presentation time, the countdown starts. If the count stop key D2 is pressed during the countdown, the countdown is temporarily stopped. The countdown of the count start key D1 is restarted again. Similarly, when the count start key D1 and the count stop key D2 are pressed, the buzzer 601 also sounds to notify that the count start and count stop have been performed. The buzzer 601 also sounds when the page set key H0 is pressed.

The above embodiment can be variously modified without departing from the scope of the present invention. For example, the sheet sensor 54c may be a reflection type optical sensor including a light emitting diode and a light receiving diode. The edging may be performed by applying a light absorbing material to part or all of the front end of the sheet. Instead of using the front end of the sheet as a reference, marks may be provided on both sides in the middle of the sheet for reference. In addition to the optical sensor, a magnetic sensor using a Hall element or the like may be used, in which case the mark is made of a magnetic material. Further, it may be a mechanical sensor such as a micro switch, and may be set so as to detect the thickness of the sheet 15. Although the border portion 15a is used for detecting the page of the sheet, the frame mark 71 may be used. In this embodiment, the sheet position sensor, the skew sensor and the page sensor are separately arranged.
It is also possible to substitute 0a and 130b.

Further, the control of the sheet conveying operation may be added with the control of decreasing the sheet conveying speed when the designated number of pages becomes close to the counted number of pages. When a skew of a sheet is detected, instead of once controlling the transport direction of the sheet after the stop, the transport direction is different from the transport direction of a correctly set sheet without skew.
For example, control and mechanical structure for discharging in a direction shifted by 90 degrees may be added. When two detections used for calculating the skew feed amount are used for page counting, one of the two marks may be detected as one page or two detections may be performed as one page. Further, the skew feeding sensor is provided on the front edge of the sheet 15 and has an edge portion 15
Although the front end position was detected from the difference in the amount of reflected light due to a,
The sheet 1 without the edging portion 15a having high reflectance
When it is possible to determine whether or not 5 passes, for example, when the pressing film 38 is present on the sheet 15 more than the pressing film 38 alone, the reflectance is high and the skew sensor can detect this difference. Special sheet 1
You don't have to use 5. The skew feeding amount measuring routine may be executed not only in the single-sheet feeding control sequence but also in the preset stage. At this time,
You can quickly find a seat setting error in the preparation stage before the announcement.

Further, a liquid crystal shutter capable of setting the data indicating the remaining time of the presentation displayed on the display section 122a may be provided at one corner of the platen glass, and at this time, the remaining time is displayed at one corner of the image projected on the screen. You can also do it. The image on the sheet is not limited to transmitted light, and may be projected on the screen by reflected light. Further, the projected image may be either a reverse image or a normal image with respect to the image formed on the sheet. The remote operation may be performed by a radio signal having a unique frequency other than the infrared signal.
The timer, the buzzer and the display unit for notifying the arrival of the time may use the buzzer and the display unit of the remote control transmitter. At this time, the remote control transmitter and the OHP device bidirectionally communicate with each other. For example, when the time measured by the OHP device reaches a set value, it is transmitted to the remote control transmitter and the display section of the remote control transmitter blinks. It is also possible to adopt a configuration such as Further, the light receiving unit may be one that can receive light from all directions with a solid angle of 4π, and even at this time, by adding a configuration for rotating the light receiving unit around a predetermined axis, a shield is provided between the light receiving unit and the remote control transmitter. However, there is a case where light can be received even in a range where it cannot receive light as it is. Further, although the light receiving section 153 is configured to rotate about one axis, it may be configured to rotate about two axes. At this time, the two axes are provided so as to be orthogonal to each other or at a predetermined angle. Either is fine. Alternatively, a cable may be provided in the middle such as an optical fiber. Instead of using the model number data to specify the OHP device, the protocol of the optical signal may be different so that only the specific OHP device can receive the data. The timer may be configured to start upon replacement of the seat, or the lap time of each seat may be displayed or stored each time the seat is replaced. Instead of the OHP device 10 that projects the image of the sheet 15 placed on the platen glass, a slide projector that sets a slide film in a cassette and projects the image may be used.

[0051]

According to the present invention, the conveyance of a sheet is automatically controlled by detecting a predetermined portion of the sheet, so that the presenter can find out a necessary sheet from among the sheets that have been presented by the presenter. You can avoid the trouble of placing it on the platen glass in the correct orientation. In particular, a desired sheet is automatically conveyed and displayed by simply specifying the number of pages, so that an efficient presentation can be performed. Further, when the sheet is conveyed in a skewed state, it is possible to perform a more efficient presentation by performing control such as stopping the conveyance.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a sheet feeder 30 mounted on an OHP device 10 according to an embodiment.

FIG. 2 is a cross-sectional view showing a structure of a sheet feeder 30.

FIG. 3 is a sheet 15 placed on a platen glass 12.
It is explanatory drawing which shows the position.

FIG. 4 is a block diagram showing a configuration of a control circuit 110.

5 is a front view showing the external appearance of a timer setting display unit 69. FIG.

FIG. 6 is a block diagram showing a configuration of a remote control receiving circuit 118.

FIG. 7 is a circuit diagram showing a configuration of a light receiving unit 121.

FIG. 8 is a perspective view showing a drive system of the light receiving unit 121.

9 is a perspective view showing the external appearance of a remote control transmitter 201. FIG.

10 is a circuit diagram showing an internal circuit of a remote control transmitter 201. FIG.

FIG. 11 is an explanatory diagram showing the structure of a transmission code.

FIG. 12 is an explanatory diagram showing a machine number code corresponding to a machine number.

FIG. 13 is an explanatory diagram showing a data code corresponding to a key.

FIG. 14 is an explanatory diagram showing received data corresponding to a key function.

FIG. 15 is a flowchart showing a turning operation of the light receiving unit 121.

FIG. 16 is a flowchart showing a conveying operation of the sheet 15.

FIG. 17 is a flowchart showing the measurement of the skew feeding amount.

FIG. 18 is a timing chart showing the measurement of the skew feeding amount.

FIG. 19 is a flowchart showing page control.

FIG. 20 is a flowchart showing the operation of the timer.

FIG. 21 is a perspective view showing a configuration of a remote control transmitter 601.

[Explanation of symbols]

 10 ... OHP device 15 ... Sheet 30 ... Sheet feeder 36 ... Conveying film 38 ... Holding film 201, 601 ... Remote control transmitter

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideaki Furukawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (9)

[Claims] 1. An image projection means for projecting an image of a sheet stopped at a predetermined position, a sheet conveying means for conveying the sheet to the predetermined position, and a portion for detecting a predetermined portion of the sheet conveyed to the predetermined position. An image projection apparatus comprising: a detection unit; and a conveyance control unit that controls the sheet conveyance unit according to the predetermined position detected by the position detection unit. 2. An image projecting means for projecting an image of a sheet stopped at a predetermined position, a sheet conveying means for bidirectionally conveying the sheet to the predetermined position, and a predetermined portion of the sheet conveyed to the predetermined position. A position detecting means for detecting, a page counting means for increasing or decreasing the number of pages according to a predetermined position of the sheet detected by the position detecting means and a conveying direction thereof, a page number setting means for setting the page number, Discriminating means for discriminating between the number of pages set by the page number setting means and the number of pages increased or decreased by the page counting means, and conveyance for stopping the conveyance of the sheet conveying means according to the discrimination result of the discrimination means. An image projection device including a control unit. 3. The image projection apparatus according to claim 2, wherein a mark is added to the sheet, and the page counting means counts the mark. 4. The image projection according to claim 2, further comprising remote control means for controlling the sheet conveying means by remote control, and the remote control means is provided with the page number setting means. apparatus. 5. An image projecting means for projecting an image of a sheet stopped at a predetermined position, a sheet carrying means for carrying the sheet to the predetermined position, and at least two positions of the sheet carried to the predetermined position are detected. A spot detecting unit, a skew detecting unit that detects the skew amount of the sheet with respect to the transport direction based on at least two spots detected by the spot detecting unit, and a skew amount detected by the skew detecting unit. And an image projecting apparatus including a sheet transporting unit that controls the sheet transporting unit according to the above. 6. The image projection apparatus according to claim 5, wherein the transport control unit switches the transport direction of the sheet transport unit. 7. The image projection apparatus according to claim 5, wherein the sheet conveying unit includes a display unit that displays a skew amount of the sheet. 8. The position detecting means detects marks provided at two positions on the sheet.
The image projection device according to claim 7. 9. The image projection apparatus according to claim 8, wherein the mark is the mark according to claim 3.