JPH02190836A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To surely and easily set an image pickup range by providing a framing projection means for projecting a framing mark for displaying the image pickup range on a recording surface. CONSTITUTION:A slit plate 67 is disposed at a position equivalent to the image- forming position of a photographing lens in an initial position. A light projecting slit 68 is opened in the center part of the slit plate 67, and framing slits 71-76 and framing slits 78-83 are opened on the left side and the right side of the slit 68 respectively. Therefore, AF spot light A is projected on a screen 131 through a finder mirror with the light emitted from a xenon tube inside a main body 10 and passing through a pin hole and the framing mark F is projected in the same way with the light passing through the framing slits. Thus, the image pickup range is easily set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic copying device that draws an image on a recording surface of a blackboard or the like and prints it out on recording paper.

[Prior art] Characters and figures written on a recording surface such as a blackboard or whiteboard are imaged on an imaging unit such as a COD image sensor,
2. Description of the Related Art Electronic copying apparatuses are known in which a printer records an image on recording paper based on an image signal from an imaging unit.

In the electronic copying apparatus described in Japanese Patent Application Laid-open No. 58-162942, the image capturing range is confirmed through an optical finder, and then the printer is operated to record the image. Furthermore, in the electronic copying apparatus described in Japanese Patent Application Laid-open No. 58-69173, all image signals obtained from the imaging section are converted into digital data and then stored in a frame memory.
Based on these data, an image is displayed on a CRT or liquid crystal display panel, and this display screen is used to set the imaging range.

[Problem to be solved by the invention]

However, with the former electronic copying device, when taking an image, the user must look through a small viewfinder to set the imaging range, which is troublesome. Further, even if the imaging range shifts due to vibrations or the like immediately before the imaging operation, the photographer may not be able to recognize this, and the printer may end up printing a diagram with part of the intended line diagram missing.

In addition, the latter type of electronic copying device has a built-in optical viewfinder, which makes it large, heavy, and expensive.Furthermore, the image capturing method is such that it is stored in a frame memory and then trimmed within it, making it impossible to use pixels effectively. There were drawbacks.

[Purpose of the invention]

The present invention has been made to solve the above problems,
It is an object of the present invention to provide an electronic copying device that enables reliable and easy setting of an imaging range and is advantageous in terms of cost.

[Means to solve the problem]

In order to achieve the above object, the electronic copying apparatus of the present invention is provided with a framing projection means for projecting a framing mark for displaying an imaging range onto a recording surface.

Further, as the framing projection means, it is effective to use a TTL method in which a framing mark is irradiated via a photographing optical system in order to simplify the configuration.

[Effect]

According to the above, since the imaging range is set by actually projecting the framing mark onto the recording surface itself, there is no need to look through a small finder, and imaging and recording can be performed very easily and with a sense of security.

Furthermore, according to the TTL method, since the photographing optical system can be used as a projection optical system, it is possible to achieve downsizing and cost reduction, and it also enables highly reliable framing by eliminating the effects of vararax. .

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

〔Example〕

In FIG. 2 showing the external appearance of the electronic copying apparatus according to the present invention, an imaging section 11 is provided at the front upper part of the main body 10 of this electronic copying apparatus. On the top surface of the imaging unit 11 is a vertical range designation knob 12. Imaging button 13 and horizontal range designation dial 1
4 are arranged.

Rotate the horizontal range designation dial 14 to set the designation protrusion 14a to 3
By matching one of the two indicators 5, the width of the effective recording area can be selected in three stages depending on the horizontal size of the blackboard. An opening 17 is formed in the front surface of the imaging section 11, and a photographing lens 16 is built into the opening 17 so as to be movable forward and backward along the photographing optical axis 9. The front surface of the photographic lens 16 can be protected by a lens cover 26, which will be described later. A light-receiving sensor 18 is attached to the top of the photographic lens 16 to receive distance-measuring light, which will be described later. Then, the distance from the main body 10 to the blackboard is detected based on the photoelectric output from the light receiving sensor 18.

A handle 19 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 is a built-in printing unit that prints out the diagram recorded on the blackboard. In addition, the lower end of the lid 21 and the main body 1
A discharge port 24 for discharging the thermal recording paper 23 on which an image has been recorded is formed between the recording paper 23 and the recording paper 23. In addition, 122
An operating section is provided inside the main switch, a print mode switch 5, a density adjustment switch, and the like.

In FIG. 1 showing the main parts of the electronic copying device, a lens cover 26 made of transparent acrylic or the like is attached to a rotation shaft 27.
, and is biased clockwise by a spring 28. A locking lever 29 is attached to the other end of the rotation shaft 27.

Further, a lens barrel 31 that holds the photographing lens 16 is rotatably provided behind the lens cover 26. This lens barrel 31 is formed with a tooth row portion 32 with a tooth row of 30 degrees, and a gear 33 that meshes with this tooth row portion 32.
The rotation of the stepping motor 34 is transmitted to the lens barrel 3 via
1.

Since the threaded tooth row 30 is threadedly engaged with a threaded tooth row (not shown) provided on the main body of the electronic copying device, the lens barrel 31
moves back and forth according to its own rotation.

This stepping motor 34 is rotated forward or reverse in response to a distance measurement signal from an AF control section, which will be described later.

Note that a reflection type food sensor 36 is disposed close to the lens barrel 31. This photosensor 36 detects a signal piece 37 fixed to the lens barrel 31, and detects that the lens barrel 31 has rotated and returned to the initial position shown. ~ A cam 3 is provided at the rear end of the lens barrel 31.
8 is integrally formed, and a sliding pin 41 integrally formed with the mirror rotation lever 39 abuts on this cam 38. One end of this mirror rotation lever 39 is engaged with the locking lever 29 which is biased counterclockwise. Behind the lens barrel 31, a finder mirror 42 biased clockwise is rotatably supported by a shaft 43. The finder mirror 42 is set at the lowered position shown in the figure during framing, and is reversed and retracted from above the optical axis 9 of the photographic lens 16 during photographing. A pin 44 that engages with the mirror rotation lever 39 is implanted in the finder mirror 42 . Furthermore, a substrate 46 having an opening 47 formed therein is disposed above the finder mirror 42 . Low pins 48-50 and high pins 52-54 are implanted on the upper surface of the substrate 46. A mask plate 56 and a slit plate 67 are slidably disposed on this substrate 46.

The mask plate 56 has slits 57 to 59 and selection slits 61 to 6 for inserting the pins 48 to 50, respectively.
3 have been established. As shown in FIG. 3, the spacing between the selection slits is such that selection slits 62 and 63 are at
3, and L+ > L, 0. Further, a notch 65 is formed at the right end of the mask plate 56,
It forms an interval Lx (>L+) from the selection slit 63. Therefore, as described later, the selection slit 61
By selecting .about.63, three widths of the framing mark can be selected. Further, the lengths of the selection slits 61 to 63 degrees and the notch portions 65 in the vertical direction are unified to S. Note that an AF slit 62a for projecting light for distance measurement is connected to the selection slit 62.

The mask plate 56 has pins 48 to 5 in the slits 57 to 59.
0 and slides into contact with the substrate 46, so that it is slidably held in the -X direction. This slide is driven by a gear 64 that meshes with a tooth row formed on the edge of the mask plate 56.
This is done by rotating the The gear 64 rotates in accordance with the rotation of the lateral range designation dial 14. Horizontal range specification dial 1
The rotation amount of 4 is detected by the encoder 109 as a digital signal.

A slit mirror 67 is disposed at a position equivalent to the imaging position of the photographing lens 16 at the initial position.

A light projecting slit 68 is opened in the center of the slit plate 67, and framing slits 71 to 76 are opened on the left side thereof, and framing slits 78 to 83 are opened on the right side thereof. These framing slits are formed symmetrically with respect to the slit 68. The spacing between the framing slits 76 and 81, and the spacing between the framing slits 75 and 82.

The interval between 74 and 83 is L2, and the selection slit 61
~63. This corresponds to the distance between the notches 65. Further, the vertical lengths of the framing slits 71 to 76 and 78 to 83 are unified to P, which is set smaller than the vertical length S of the selection slit. The slit plate 67 is also provided with slits 86 to 8 through which the pins 52 to 54 are inserted, so that the slit plate 67 is held slidably in the Y-Z direction on the mask plate 56. . To make the slit plate 67 slide, a toothed part 89 is formed on the edge of the slit plate 67, and a gear 91
It meshes with the. A gear 92 provided with the vertical range designation knob 12 meshes with the gear 91, and the rotation of the gear 92 can control the sliding movement of the slit plate 67. gear 92
The amount of rotation is detected by the encoder 111 as a digital signal.

The internal reflecting mirror 93 has a xenon tube 94 installed therein as a projection light source, and is held by a holding plate 96. Hold Fi,
96 has the above-mentioned framing slits 71 to 76 and 78 to
Apertures 97 and 98 for projecting light to and from 83, respectively, and a partition plate 99 for separating these are provided. The partition plate 99 has a pinhole 1 for projecting AF spot light.
01, as shown in FIGS. 7(A) and 7(B), a slit plate 67 and a It is opened so that it is on the same plane.

Behind the viewfinder mirror 42 is a pair of shirts! −
102 and 103 are provided. This shaft 102
, 103, a line sensor 104 is supported so as to be movable in the horizontal direction, and the line sensor 104 can be slid through the wire 10 by the movement of a stepping motor 106. The line sensor 104 is
For example, light receiving elements numbered 1 to 2048 are arranged in a row from bottom to top. Reference numeral 107 indicates a reflective photosensor, which detects that the line sensor 104 is at the home position.

FIG. 5 shows a block diagram of the present invention, in which the microcomputer 112 is connected to the AF unit 113 (imaging unit) 114 . It controls the imaging unit drive unit 116° and the print unit 117.

The AF unit 113 includes a photosensor 36. AF control section 1
18. A driver 119 is provided. The light receiving sensor 18 receives the AF spot light projected through the photographing lens 16 and the reflected light on the blackboard, and outputs a photocurrent. The AF control unit 118 determines the distance to the blackboard based on the output from the light receiving sensor 18 and sends a distance signal to the microcomputer 112.

A driver 119 is connected to the stepping motor 34. The microcomputer 112 controls the amount and direction of rotation of the stepping motor 34 using the ranging signal from the AF control section 118 and the signal from the photosensor 36.

The imaging unit 114 is an E/coder 109. It includes a driver 121 that drives I11 and the line sensor 104. The microcomputer 112 sets the horizontal reading range of the line sensor 104 according to the signal from the encoder 109, and also sets the vertical pixel of the output from the line sensor 104 to be used for printing according to the signal from the encoder 111. A region (for example, 1600 pixels among pixels 1 to 2048) is set. A binarization circuit 110 is connected to the line sensor 104. Binarization circuit 11
0 corresponds to the photoelectric output from each pixel based on a predetermined threshold level, and sends it to the microcomputer 112 by associating "1" with the output above the threshold level and "0" with the output below it. do. The microcomputer 112 controls image recording by associating white with input signal "1" and black with input signal "0", for example.

In FIG. 8, which shows the projection of the framing mark onto the screen 131 to be imaged, light emitted from the xenon tube 94 inside the main body 10 and passed through the pinhole 101 is directed to the screen 131 via the finder mirror 42.
An AF spot light A is projected onto the frame, and the light that has passed through the framing slit similarly projects a framing mark F.

In FIG. 6 showing the positional relationship between the slit plate 67 and the mask plate 56, in the position shown in FIG. ing. This projected image forms framing marks F+ and Fz on the screen 131.
, F2. F, and the effective recording area is determined in the center.

Furthermore, if a wider effective recording area is required, the mask plate 56 can be slid in the direction {circle around (2)} by rotating the lateral range designation dial 14 and turning the gear 64 to the right. As a result, the selection slits 63.61 are replaced with the framing slits 72.75 and 79.8, as shown in FIG.
It can be moved above 2. Therefore, the framing marks F on the screen 131 become F, to F, +, and a wider effective recording area is obtained. Also, if you want to frame upwards, use the vertical range designation knob 1.
2 should be rotated to the right. Due to this right rotation, the slit plate 67
moves in the Y direction, the framing mark F gradually rises while maintaining the same width, and stops when the right rotation is stopped. The state shown in FIG. 6(C) corresponds to the upper limit of the framing mark. The effective recording area E at this time is the area E shown with diagonal lines.

If a wider effective recording area is required, rotate the horizontal range designation dial 14 to the right to create a frame jig slit. Framing marks corresponding to 3, 74, 78, and 83 can be projected.

At this time, the framing slits 78 and 83 are located in the notch 65 and project the framing mark.

After that, when the image capture button I3 is pressed, the AF control unit 118 performs distance measurement as described above, and the microcomputer 112 causes the driver 119 to rotate the stepping motor 34 clockwise and move the lens barrel 31 from the initial position. move toward the in-focus position.

In the approach area where the cam 3B rotates from the initial position, the cam 3B touches the sliding pin 4.
1 to rotate the mirror rotation lever 39 counterclockwise.

When the mirror rotation lever 39 is rotated counterclockwise, the rotation shaft 27 is rotated counterclockwise via the locking lever 29, and the lens cover 26 is flipped up.

At the same time, the mirror rotation lever 39 presses the pin 44 to push up the finder mirror 42.

When the lens cover 26 and finder mirror 42 are flipped up, the light that has passed through the photographic lens 16 reaches the line sensor 104 at the start position.

When the lens barrel 31 further rotates and reaches the in-focus position, the microcomputer 112 stops the rotation of the stepping motor 34. In synchronization with this, the stepping motor 106 rotates clockwise, causing the line sensor 104 at the home position to travel from right to left via the wire 10B.

In this way, the line sensor 104 starts running, and when the line sensor 104 moves to the position corresponding to the signal from the encoder 109, the microcomputer 112 sends the driver 1
The command was issued on 21. As a result, the line sensor 10
4 starts reading the image from a position corresponding to the horizontal size of the blackboard, and the line sensor 104 outputs an image signal for each line. Note that, as described above, the line sensor 10
4 is constructed by arranging 2048 minute light-receiving elements, so 2048 signal outputs from these light-receiving elements can be obtained as one line of image signals.

The microcomputer 112 supplies image signals for 1600 light receiving elements in the area corresponding to the signal from the encoder 111 to the print unit 117 out of the image signals for one line input from the line sensor 104 in this way. For example, when the imaging range is set to the uppermost side by adjusting the vertical range designation knob 12, among the image signal outputs from the line sensor 104 consisting of light receiving elements numbered 1 to 2048, the lower 1 to 16.00 Only the signal output from the light-receiving element numbered is supplied to the driver 122 as a valid signal.

The driver 122 has a built-in buffer memory for one line, and when an image signal for one line is supplied from the microcomputer 112, the thermal head 123 is driven to print one line on the recording paper 23. Furthermore, when printing for one line is completed, the microcomputer 112 drives the stepping motor 124 via the driver 1-25, thereby transporting the recording paper 23 by a predetermined unit length.

At the same time, the stepping motor 106 is driven by a predetermined unit angle via the driver 127, the line sensor 104 is moved in the horizontal direction, and imaging and printing for the next line are continued.

Printing continues in this way, and the line sensor 104
takes an image at the end reading position determined by the setting position of the horizontal range designation dial 14, and when the printing is completed, the microcomputer 112 reverses the stepping motor 106 via the driver 127. This causes the line sensor 104 to be moved toward the home position.

Then, the line sensor 1
04 is detected to have returned to the home position, the stepping motor 106 stops.

Also, when printing for one screen is completed, the microcomputer 11
A reverse rotation signal is also supplied to the driver 119 from 2, and the stepping motor 34 rotates clockwise to rotate the lens barrel 31.
In this process, the mirror rotation lever 39° locking lever 29 is operated by the cam 38, and the finder mirror 42 and lens cover 26 are returned to the initial position shown in FIG. Then, when the photosensor 36 detects that the lens barrel 31 has returned to its initial position, the stepping motor 34 also stops, and the entire apparatus is restored to its initial state.

In addition, in the above-mentioned embodiment, the photographing lens 16 is used, and the TT
Although the L method is used to project the framing marks, it is of course possible to provide a projection optical system separately from the photographing lens 16 to project the framing marks.

〔Effect of the invention〕

As described in detail above, in the present invention, an electronic copying apparatus that obtains an image on a recording surface as a hard copy is provided with a framing projection means for projecting a framing mark indicating an effective recording area onto the recording surface. Therefore, it is possible to provide an electronic copying device that is low cost, easy to use, and has fewer mistakes in framing settings.

Furthermore, when the framing projection means irradiates projection light through the photographing optical system, the photographing optical system can also be used as a projection optical system for framing marks, so that it can be used as a low-cost and compact electronic A copying device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the main parts of an electronic copying apparatus according to the present invention. FIG. 2 is an external view of the electronic copying device shown in FIG. 1. FIG. 3 is a plan view of the mask plate used in the embodiment of FIG. 1. FIG. 4 is a plan view of the slit plate used in the embodiment of FIG. 1. FIG. 5 is a block diagram showing the electrical configuration of the electronic copying apparatus of FIG. 1. Figure 6 (A) shows the arrangement of the slit plate and mask plate to obtain a narrow range/central effective recording area, and (B) shows the arrangement to obtain a medium range/central effective recording area. and (C
) is an explanatory diagram showing the arrangement for obtaining a middle range/top effective recording area. FIG. 7(A) is a vertical sectional view of the slit plate and the pinhole portion, and FIG. 7(B) is a plan view of the slit plate and the pinhole portion. FIG. 8 is an explanatory diagram of the operation of the electronic copying device shown in FIG. 1. 11... Imaging unit 12... Vertical range specification knob 13... Imaging button I4... Horizontal range specification dial 16... Photographing lens 18... Light receiving sensor 31... Lens barrel 3rd... Cam 39... Mirror rotation Moving lever 42...finder mirror 46...substrate 56...mask plate 61-63...selection slit 67...slit plate 71-76.78-83...framing slit 94
・ ・ 96 ・ ・ 101 ・ 102° 104 ・ 109° Xenon tube holding plate・pinhole 103・・shaft・line sensor 111・・encoder. -11-L2-111

Claims (2)

[Claims] (1) A photographing optical system that forms an image of a recording surface onto an imaging surface, an imaging means that photographs the image recorded on the imaging surface and outputs an image signal, and indicates an effective recording area for the recording surface. An electronic copying device comprising: a framing projection means for projecting a framing mark. (2) The electronic copying apparatus according to claim 1, wherein the framing projection means irradiates projection light through the photographing optical system.