JPH02186869A - Electronic copying device - Google Patents

Abstract

PURPOSE:To facilitate an operation and Further to attain a secure framing by preventing a mark, which is used for framing and focusing, from being photographed at the time of photographing while the framing and focusing is executed just before the photographing is executed. CONSTITUTION:A framing mark 122 is projected on a blackboard 121 and a target mark 124 for AF is projected on the central part of the blackboard. These framing mark 122 and target mark 124 are repeatedly projected and during this projection, the framing is completed so that a photographing objective area 120 can be received in the framing mark 122. In such a manner, just before the photographing is started, the final framing is executed and further after the mark projection operation is prohibited, the photographing is started. Thus, the framing can be easily executed without fail.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronic copying device that projects a frame mark representing an effective recording area onto a recording surface of a blackboard, whiteboard, or the like.

[Conventional technology]

JP-A-58-16'2942 and JP-A-58-69
As seen in Publication No. 173, an image written on a recording surface such as a blackboard or whiteboard is captured by an imaging device such as a CCD image sensor, and the image is printed out on recording paper based on the obtained image signal. Electronic copying devices are known.

In the electronic copying device described in Japanese Patent Application Laid-Open No. 58-162942, it is necessary to frame the device by looking through an optical viewfinder built into the main body of the device. It was inconvenient. Furthermore, in the method described in Japanese Patent Application Laid-Open No. 58-69173, image data is once captured in a frame memory, and based on this image data, the image is displayed on an electronic viewfinder such as a CRT for framing. An increase in cost due to the use of frame memory is unavoidable.

Under these circumstances, electronic copying devices are being considered that incorporate a projection mechanism into the main body of the device and project frame marks onto the recording surface to perform active framing. According to this, since framing is performed without observing both the image and the frame mark on the recording surface, the operation is simple and reliable framing is possible.

In addition, in order to obtain clear printed images, it is necessary to adjust the pit of the photographing lens according to the distance to the recording surface. Projection also has the advantage that the pit of the photographic lens can be automatically adjusted using the active autofocus method used in compact cameras and the like.

[Problem to be solved by the invention]

However, when framing and focusing are performed by projecting frame marks and pattern marks for distance measurement onto the recording surface as described above, these marks are displayed along with the image on the recording surface when imaging is started. A new problem arises in that the image is captured. Incidentally, since the projection of the frame mark light consumes a large amount of power, it causes disturbances in the imaging circuit due to fluctuations in the power supply voltage of the imaging circuit, noise entering the imaging device, and the like. Regarding pattern marks for distance measurement, for example, the above problem can be avoided by cutting visible light and projecting light through a filter that transmits infrared light. Since the mark is visible to the naked eye,
It is not possible to take an image while projecting this.

For this reason, it is necessary to stop the projection of the frame mark before starting imaging, but it is cumbersome to perform such a preliminary operation before starting imaging, and the frame mark and projection must be stopped before starting imaging. If the pattern mark is not projected, it will not be possible to confirm the final framing or perform focusing immediately before imaging.

(Purpose of the Invention) The present invention has been made to solve such a problem, and it is possible to perform framing and focusing until just before the start of shooting, while at the time of shooting, the marks used for framing and focusing may not be captured. An object of the present invention is to provide an electronic copying device that avoids the need for electronic copying.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a mark projection means that projects a frame mark representing an effective recording area on a recording surface such as a blackboard surface for a predetermined period of time, and a mark projection means that projects a frame mark representing an effective recording area on a recording surface such as a blackboard surface. A drive means for driving an imaging device that extracts an electrical image signal from an optical image obtained by the lens, and a control means for operating the drive means after prohibiting the operation of the mark projection means by a print start operation. It is something.

Note that the projection of the frame mark is performed intermittently.

Further, another invention includes a projection means for projecting a frame mark representing an effective recording area onto a recording surface such as a blackboard surface, a focusing means for adjusting pits of the photographing lens, and a frame mark obtained by the photographing lens by a print start operation. A driving means for driving an imaging device that extracts an electrical image signal from an optical image; and a control means for activating the driving means after prohibiting the operation of the mark projection means after activating the focusing means by a print start operation. It has been established that

[Effect]

According to the above configuration, the control means is activated by activating the mark projection means to perform a framing operation, and then performing a print start operation. When this control means operates, the operations of the mark projection means and the driving means are sequentially controlled. Immediately before the start of imaging, final framing is performed, and after the operation of the mark projection means is prohibited, imaging is started. Furthermore, since the mark projection means projects the frame mark intermittently, the durability of the light source used in the projection means can be extended.

Further, in another invention, the control means is activated by activating the mark projection means to perform a framing operation, and then performing a printing start operation. When this control means operates, the operations of the mark projection means, focusing means, and driving means are sequentially controlled. Immediately before the start of imaging, final focusing is performed, and after the operation of the mark projection means is prohibited, imaging is started.

An embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

In FIG. 1 showing the external appearance of an electronic copying device according to the present invention, an imaging section 11 is provided at the front of a main body 10 of the electronic copying device. On the top surface of the imaging unit 11 is a vertical range designation knob 12. Image capture button 13, horizontal range designation dial 14. A framing button 15, which will be described in detail later, is also provided.

The horizontal range designation dial 14 is formed with a designation protrusion 14a. By rotating the horizontal range designation dial 14 and aligning the designation protrusion 14a with any of the three indicators 16,
The width of a standard blackboard is 90 cm, 12
The width of the effective recording area corresponding to either 0 cm or 180 cm can be selected.

A photographic lens 17 is installed at the back of the opening 18 on the front surface of the imaging section 11. An AF packing device light receiving window is formed above the photographing lens 17, and a light receiving lens 19 is fitted into this light receiving window. Further, a handle 20 for carrying is provided at the rear of the imaging unit 11. Two large and small lids 21 and 22 are provided on the side surface of the main body 10 so as to be openable and closable. Inside the lid 21, there is built-in a print unit that prints out a line drawing of the effective image area selected by the vertical range designation knob 12 and the horizontal range designation dial 14. Further, a discharge port 24 is formed between the lower end of the lid 21 and the main body 10 for discharging the thermal recording paper 23 on which an image is printed. Furthermore, inside the lid 22 there is a main switch and a print mode switch.

An operation section in which a concentration adjustment switch and the like are arranged is provided.

In FIG. 2 showing the main parts of the electronic copying apparatus, a toothed part 31 is formed on a lens barrel 30 that holds the photographic lens 17 movably along the optical axis 17a. When the pulse motor 33 is driven, the gear 32. The lens barrel 30 rotates via the tooth row 31, thereby moving the photographing lens 17 along the optical axis 17a. A reflective photosensor 34 is disposed adjacent to the lens barrel 30. This photosensor 34 is connected to the lens barrel 3
The signal piece 35 fixed at 0 is detected, and it is detected that the lens barrel 30 has rotated and reached the initial position P shown in the figure.

A light receiving element 36 composed of a PSD is disposed behind the light receiving lens 19. This light receiving element 36 receives a portion of the light emitted from the photographing lens 17 and reflected by the blackboard surface, and outputs a current signal A that varies depending on the light receiving position.
It is output to the F control section 37. This AF control section 37 outputs a distance measurement signal according to the current signal to a microcomputer to be described later,
The drive of the pulse motor 33 is controlled via a microcomputer.

Behind the lens barrel 30, a finder mirror 41 driven by a mirror drive unit 40 is rotatably supported on a shaft 42. A substrate 43 is disposed above the finder mirror 41, and an opening 44 is formed in the substrate 43. Furthermore, three short pins 45 and three tall pins 46 are implanted on the upper surface of the substrate 43.

The substrate 43 has a mask plate 47 and a slit plate 48.
are superimposed. Three elongated holes 49 are formed along the longitudinal direction of this mask plate 47, and the pins 45 are inserted into these three elongated holes 49, respectively. Three selection slits 50 to 52 having the same length are formed along the optical axis 17a direction so as to be sandwiched between the elongated holes 49, with their ends aligned. A notch 53 is connected to the selection slit 51 and has a T-shaped shape. Furthermore, a notch 54 having the same shape as the selection slit 51 is formed on the right side surface of the mask plate 47 so as to correspond thereto. Mask plate 47 with tooth row formed
A gear 55 meshes with the rear side surface of the
is fitted onto the shaft of the lateral range designation dial 14. Therefore, when you turn the horizontal range designation dial 14,
The mask plate 47 slides along the longitudinal direction of the substrate 43. This sliding amount is digitally detected by a potentiometer 56.

An AF light projection slot 60 is formed in the center of the slit plate 48 along the optical axis 17a direction. Also,
The slit plate 48 has dogleg-shaped framing slits 6 that are symmetrical about the slot 60.
Twelve 1's are formed. Furthermore, three elongated holes 62 into which the pins 46 are inserted are formed around the slit plate 48. A pin 46 is inserted into this elongated hole 62 to regulate the sliding direction of the slit plate 4. A gear 63 meshes with the side surface of the slit plate 48 on which the tooth row is formed. This gear 63 meshes with a gear 64 in which the vertical range specifying knob 12 is embedded. Therefore, the slide of the slit plate 48 can be controlled by the vertical range designation knob 12,
The sliding amount is detected as a digital signal by a potentiometer 65 that is interlocked with a gear 64.

A beam flap 66 is arranged above the slit plate 48 and is held by a holding plate 67.

This reflector 66 has a xenon tube 6B as a light source.
is installed. This xenon tube 68 starts intermittent lighting when the framing button 15 is turned on. In this embodiment, the xenon tube 68 is lit intermittently, but it may be lit continuously. The retaining plate 6
7 is an opening 69, 70 for projecting light from the xenon tube 68 into the slit 61, and a partition plate 71 for separating these.
and is provided. AF pinhole 7 on partition plate 71
2 is formed.

A pair of shafts 8 are located behind the finder mirror 41.
0.81 is provided. This shirt 1-80.81
A slidable imaging means such as a line sensor 82 is attached to the holder, and the line sensor 82 is slid by a stepping motor 84 via a wire 83. In this line sensor 82, for example, light receiving elements numbered 1 to 2048 are arranged in a row from bottom to top. code 8
Reference numeral 5 indicates a reflective photosensor, which detects the home position of the line sensor 82.

FIG. 3 shows a block diagram of the present invention, in which the microcomputer 90 includes a framing unit 92, an imaging unit 93, and so on, which are indicated by broken lines. It controls the imaging unit drive unit 94 and the print unit 95.

The framing unit 92 includes the photosensor 34 AF control section 37 . Driver 97. Framing button 15. It consists of a xenon tube 68 whose lighting is controlled by a strobe circuit 96. The signal from the framing button 15 is sent to the microcomputer 9.
When input to 0, the xenon tube 68 is lit intermittently at regular intervals via the strobe circuit 96. A portion of the light projected from the xenon tube 68 is reflected by the blackboard surface, and the light receiving element 36 outputs a signal to the AF control section 37.

The AF control section 37 calculates the distance to the blackboard based on this signal and sends a distance measurement signal to the microcomputer 90. A driver 97 is connected to the pulse motor 33. The microcomputer 90 controls the amount and direction of rotation of the pulse motor 33 using the ranging signal from the AF control section 37 and the signal from the photosensor 34.

In the imaging unit 93, a potentiometer 5665 and a driver 98 for driving the line sensor 82 are connected to the microcomputer 90. A binarization circuit 82a is connected to the line sensor 82.
2 a converts the image signal read by the line sensor 82 into a binary signal and outputs it to the microcomputer 90 . This microcomputer 9
o selects a series of 1600 binary signals from 2048 binary signals output from all the light receiving elements of the line sensor 82 in accordance with the signal from the potentiometer 65. For example, if the imaging target area exists above the imaging optical axis 17a, binary signals from 1 to 1600 are selected, and if the imaging target area exists below the imaging optical axis 17a, 429
Select the binary signals from number 2048 to number 2048.

In the imaging unit drive unit 94, a photo sensor 85°, a driver 99° that drives the stepping motor 84, and a driver 100 that drives the mirror drive unit 40 are connected to a microcomputer 90. The stepping motor 84 has its rotation amount and rotation direction controlled by pulses output from the microcomputer 90, and causes the line sensor 82 to run.

In the print unit 95, stepping motors 103. thermal head 10
4 is connected to the microcomputer 90. Then, when the line sensor 82 reads the first line, the thermal head 104 prints the first line. When the printing of this first line is completed, the line sensor 82
Reading and printing are performed alternately, such as reading the line. Note that when the thermal head 104 prints the last line and stops its operation, the microcomputer 90 stops the rotation of the stinger motor 103 that drives the drawing device 105 after a certain period of time.

Regarding the operation of the electronic copying apparatus of the present invention configured in this way, FIGS. This will be explained with reference to the time chart shown in the figure. The main body 10 is placed on a stand 123 placed in front of the blackboard 121, and the horizontal range designation dial 14 is rotated to set the indicating protrusion 14a to the index 1 corresponding to the horizontal width of the blackboard 121.
Match 6.

After turning on the power, when the framing slit 5 is pressed, the microcomputer 9 to which the framing signal was input at T.
0 supplies a light emission trigger to the xenon tube 68 at regular intervals,
The xenon tube emits light intermittently for 6 days. This intermittent light emission should be spaced out in order to meet the demand for miniaturization of power supply devices, but if the number of times of light emission per second becomes less than one, the framing operation becomes extremely difficult. For this reason, it is preferable that the number of lighting times per second is two to three times.

The xenon tube 68 emits light, and the framing slit 6
1 and the selection slit, the light passes through the finder mirror 4.
1 onto a blackboard 121, and an AF target mark 124 is projected onto the center thereof.

This framing mark 122 and target mark 12
4 is repeatedly projected after T1.

During this time, the orientation and position of the main body 10 are determined so that the imaging target area 120 falls within this framing mark 122. Next, framing is performed in the vertical direction, and as shown in the figure, the imaging target area 120 is located at the framing mark 1.
22, turn the vertical range designation knob 12 clockwise in FIG. When the slit plate 48 slides toward the front side of the main body 10 due to this rotation, the framing mark 122 projected on the blackboard 121
moves upward and coincides with the outer edge of the imaging target area 120. In this way, while the projections are repeated,
Finish the framing. Note that this projection time may vary depending on the durability of the light source, the time spent on framing, etc.
It is set between seconds and 12 seconds, preferably between 8 seconds and 10 seconds. In addition, if the framing is not completed within this projection time, by pressing the framing button 15 again, the framing mark 122
Then, projection of the target mark 124 is restarted.

A portion of the light that first projects the target mark 124 is reflected by the blackboard 121 and enters the light receiving element 36 via the light receiving lens 19 . The current signal output by the light receiving element 36 is converted into a distance measurement signal by the AF control unit 37, and the current signal is output by the microcomputer 90.
sent to. The microcomputer 90 to which the ranging signal is input is T1
At the same time, the pulse motor 33 is rotated counterclockwise via the driver 97.

The lens barrel 30 rotated by this pulse motor 33 is
At 2 o'clock, the photographing lens 17 is moved to the focusing position along the optical axis direction. At this time, since the framing mark 122 is gradually brought into focus, it can be visually confirmed that the photographing lens 17 has moved to the in-focus position. After time T2, the pulse motor 33 is driven intermittently based on the ranging signal output from the microcomputer 90. Note that in this embodiment, the target mark 12
4 is projected using the light source of the framing mark 122,
Although the distance measurement is performed in synchronization with the projection of the framing mark 122, another light source may be used to reduce the number of distance measurements.

Then, when the imaging button 13 is pressed at T3, a lighting signal is output from the microcomputer 90 into which the print signal has been input, and the framing mark 122 and target mark 12
4 projections are performed. Incidentally, the image capture button 13 may be fully pressed while the framing mark 122 is being projected.

By projecting this final target mark 124, the AF
The final ranging signal is outputted once from the control unit 37 at time T1. Based on this ranging signal at T3, the lens barrel 30
moves the photographing lens I7 to the final in-focus position. Thereafter, at time T4, the mirror drive section 40 starts operating and moves the finder mirror 41 out of the photographing optical path of the photographing lens 17.

When the finder mirror 41 moves out of the photographing optical path at time T5, the light passing through the photographing lens 17 reaches the sliding surface of the line sensor 82. At the same time, stepping motor 8
4 rotates clockwise to cause the line sensor 82 at the start position to travel from right to left via the wire 83.

The running line sensor 82 outputs an image signal to the microcomputer 9o from 17:00 to Tb at a timing corresponding to the resistance value of the potentiometer 56. The microcomputer 90 selects a series of 160 images from all the output image signals.
0 binary signals are input to the thermal head 104 of the print unit 95 via the driver 102 for each line.

The microcomputer 90 simultaneously outputs the binary signal and rotates the stepping motor 103 via the driver 101.
For example, a pull-out device 105 consisting of a roller or the like is activated.

As a result, the recording paper 23 is transported toward the discharge port 24. Then, the thermal head 104 prints on the recording paper 23 line by line in accordance with the image signal selected by the microcomputer 90.

When the line sensor 82 completes reading of the imaging target area 120 at time T6, the microcomputer 90 rotates the stepping motor 84 counterclockwise and the pulse motor 33 clockwise.

When the stepping motor 84 rotates counterclockwise, the line sensor 82 slides on the shaft 81, 82 and moves to the starting position. Then, at 17:00, line sensor 8
2 reaches the home position, the photosensor 85 is turned on and outputs a position detection signal to the microcomputer 90. The microcomputer 90 that inputs the position detection signal is the driver 9
8, the rotation of the stepping motor 84 is stopped.

When the pulse motor 33 rotates clockwise at T1, the lens barrel 30 rotates clockwise toward the initial position via the toothed portion 31. During this rotation, the microcomputer 90 operates the mirror drive unit 40 at time T8, and the finder mirror 41 rotates clockwise. Then, at 17:00, the lens barrel 30 rotates to the initial position, and the photo sensor 3
4 is turned on, the rotation of the pulse motor 33 is controlled by the microcomputer 90.
will be stopped by

In the above embodiment, the light from the xenon tube 68 is transmitted to the finder mirror 41. Although the image was projected by TTL through the photographic lens 17, a projection lens may be provided on the exterior of the main body 10 to project the light from the xenon tube 68 onto the blackboard 12I.

〔Effect of the invention〕

As described in detail above, the present invention includes a mark projection means for projecting a frame mark representing an effective recording area on a recording surface such as a blackboard surface for a predetermined period of time, and an electric drive means for driving an imaging device that takes out an image signal; and control means for prohibiting operation of the mark projection means by a print start operation when the mark projection means is in operation, and then operating the drive means. Therefore, since the frame mark can be continuously projected onto the recording surface for a predetermined period of time, there is no need to look through a small finder, and if framing cannot be performed within the predetermined period of time, the projection means must be operated again. This allows the projection of the frame mark to be restarted, making framing very easy. Furthermore, since the projection is completed in a predetermined time and projection is performed intermittently within the predetermined time, the durability of the light source used in the projection means can be improved. Furthermore, if imaging and framing at the same position are completed quickly, the camera can
Print start operation can be performed. Further, in another invention, since a focusing means is provided, an image with matching pits can be captured.

[Brief explanation of the drawing]

FIG. 1 is an external view of an electronic copying apparatus according to the present invention. FIG. 2 is an exploded perspective view showing the main parts of the electronic copying apparatus of the present invention. FIG. 3 is a block diagram showing the electrical configuration of the electronic copying apparatus of the present invention. FIG. 4 is a time chart of signals used in the electronic copying apparatus of the present invention. FIG. 5 is an explanatory diagram showing the usage state of the electronic copying apparatus of the present invention. Body Vertical Range Designation Knob Imaging Button Horizontal Range Designation Dial Framing Switch Lens Barrel 4L/68/Finder Mirror Xenon Tube Line Sensor/Image Target Area/Blackboard/Framing Mark/Target Mark.

Claims (3)

[Claims] (1) In an electronic copying device that focuses an image of a recording surface such as a blackboard surface onto an imaging device through a photographing lens and creates a hard copy of the image based on an image signal from the imaging device, an image that is effective on the recording surface a mark projection means for projecting a frame mark representing a recording area for a predetermined period of time; a drive means for driving the imaging device in response to a print start operation; An electronic copying device comprising: control means for operating the drive means after prohibition. (2) The electronic copying apparatus according to claim 1, wherein the projection of the frame mark is an intermittent projection. (3) In an electronic copying device that focuses an image of a recording surface such as a blackboard surface onto an imaging device through a photographing lens and creates a hard copy of the image based on an image signal from the imaging device, an image that is effective on the recording surface. a projection means for projecting a frame mark representing a recording area; a focus means for adjusting pits of the photographing lens; a drive means for driving the imaging device upon a print start operation; and a drive means for driving the imaging device upon a print start operation. and control means for prohibiting the operation of the mark projection means and then operating the drive means.