JP2554732B2 - Imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used at a position separated by an appropriate distance from a flat recording surface such as a blackboard, and an optical image on the recording surface is converted into an electrical image signal. The present invention relates to an image pickup device which is converted into and read.

[Conventional technology]

Image a character or figure written on a recording surface such as a blackboard or whiteboard on an image pickup unit such as a CCD image sensor,
2. Description of the Related Art There is known an electronic copying apparatus in which an image is recorded on a recording sheet by a printer based on an image signal from an image pickup section.

In the apparatus described in Japanese Patent Laid-Open No. 58-162942, the image recording range is confirmed through the optical finder, and then the copying apparatus is operated to record the image. Also,
In the electronic copying apparatus described in JP-A-58-69173, all the image signals obtained from the image pickup section are converted into digital data and stored in a frame memory, and based on these data, a CRT, a liquid crystal display panel, etc. The image is displayed, and the imaging range is set using this display screen.

[Problems to be Solved by the Invention]

However, with the former copying machine, it was difficult to operate because the recording range had to be set while looking through a small viewfinder. Further, even if the recording range shifts due to vibration or the like immediately before image recording, the photographer cannot recognize this and eventually prints with a part of the target diagram missing.

In the latter electronic copying machine, the built-in optical viewfinder makes it large, heavy, and costly.
In terms of the imaging method, there is a drawback that the pixels cannot be effectively used because they are once stored in the frame memory and trimmed therein.

[Object of the Invention]

The present invention has been made to solve the above-described problems, and can effectively and simply display a range that is effectively imaged, even though it is used at an arbitrary distance from the recording surface of an image as an original. It is an object of the present invention to provide an image pickup device configured as described above.

[Means for solving the problem]

In order to achieve the above object, in the image pickup apparatus of the present invention,
A framing projecting means for projecting a framing mark for displaying an imaging range is provided on a recording surface on which an image to be imaged is recorded, separated from the imaging device, and installed at an appropriate distance.

Further, as the framing projection means, it is effective to use the TTL method of irradiating the framing mark through the imaging optical system in order to simplify the configuration.

[Action]

According to the above, since the framing mark is actually projected on the recording surface itself to set the imaging range, it is not necessary to look into a small finder, and the imaging / recording can be performed very easily and with a sense of security.

Further, according to the TTL method, since the photographing optical system can be used as a projection optical system, it is possible to achieve compactness and cost reduction, and further, it is possible to eliminate the influence of parallax and perform highly reliable framing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

〔Example〕

In FIG. 2 showing the appearance of an electronic copying apparatus using the present invention, an image pickup section 11 is provided on the front upper part of the main body 10 of the electronic copying apparatus. A vertical range designation knob 12, an image pickup button 13, and a horizontal range designation dial 14 are arranged on the upper surface of the image pickup section 11. Rotate the lateral range designation dial 14 to indicate
By matching 14a with any of the three indices 5, the horizontal width of the imaging range can be selected in three steps according to the horizontal size of the blackboard. An opening 17 is formed in the front surface of the image pickup unit 11, and a photographing lens 16 is built in the inside thereof so as to be movable back and forth along the photographing optical axis 9. The front surface of the taking lens 16 can be protected by a lens cover 26 described later. A light receiving sensor 18 for receiving light for distance measurement, which will be described later, is attached to the upper part of the taking lens 16. The photoelectric output from the light receiving sensor 18 detects the distance from the main body 10 to the blackboard.

A handle 19 for carrying is provided behind the image pickup 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, a print unit for printing out the diagram recorded on the blackboard is built in. Further, between the lower end of the lid 21 and the main body 10, a discharge port for discharging the thermosensitive recording paper 23 on which an image is recorded.
24 are formed. An operation section in which a main switch, a print mode switch, a density adjustment switch and the like are arranged is provided inside the lid 22.

In FIG. 1 showing the main part of the electronic copying apparatus, a lens cover 26 formed of a transparent acrylic plate or the like is fixed to a rotary shaft 27 and is urged clockwise by a spring 28. A locking lever 29 is attached to the other end of the rotating shaft 27. Also, behind the lens cover 26 is a shooting lens.
A lens barrel 31 that holds 16 is rotatably provided. The lens barrel 31 is formed with a thread row 30 and a tooth row portion 32, and the rotation of the stepping motor 34 is transmitted to the lens barrel 31 via a gear 33 meshing with the tooth row portion 32. . Since the thread row 30 is screwed with a thread row (not shown) provided on the main body of the electronic copying apparatus, the lens barrel 31 moves back and forth according to the rotation of itself.

The stepping motor 34 is normally / reversely rotated according to a distance measurement signal from an AF control unit described later. A reflection type photo sensor 36 is arranged in the vicinity of the lens barrel 31. The photo sensor 36 detects the signal piece 37 fixed to the lens barrel 31 and detects that the lens barrel 31 has rotated and returned to the illustrated initial position.

A cam 38 is integrally formed at the rear end of the lens barrel 31, and a sliding pin 41 integrally formed with a mirror rotation lever 39 is in contact with the cam 38. The locking lever biased counterclockwise is provided at one end of the mirror rotation lever 39.
29 engaged. Behind the lens barrel 31, a finder mirror 42 biased clockwise is pivotally supported by a shaft 43. This finder mirror 42
It is set to the lower position shown in the figure during framing, and is reversed during shooting to retract from the optical axis 9 of the shooting lens 16. The viewfinder mirror 42 includes the mirror rotation lever.
A pin 44 that engages 39 is implanted. A substrate 46 having an opening 47 is arranged above the finder mirror 42. Lower pins 48-50 and higher pins 52-54 are planted on the top surface of the substrate 46. A mask plate is placed on this substrate 46.
A slit plate 67 and a slit plate 67 are slidably arranged.

The mask plate 56 is provided with slits 57 to 59 for inserting the pins 48 to 50 and selection slits 61 to 63, respectively. As shown in FIG. 3, the interval between each selection slit is selectively slit 62 and 63 is L _0, 61 and 63 is set to L _1, it is L _1> L _0. Further, a cutout portion 65 is formed at the right end portion of the mask plate 56, and has a distance L ₂ (> L ₁ ) from the selection slit 63. Therefore, as described below, the selection slit
The widths of the framing marks can be selected in three ways by selecting 61 to 63. Further, the vertical lengths of the selection slits 61 to 63 and the cutout portion 65 are unified to S. An AF slit 62a for projecting light for distance measurement is connected to the selection slit 62.

The mask plate 56 is slidably held in the V-X direction by inserting the pins 48 to 50 into the slits 57 to 59 and slidingly contacting the substrate 46. This sliding is performed by the rotation of the gear 64 that meshes with the tooth row formed on the edge of the mask plate 56. The gear 64 rotates according to the rotation of the lateral range designation dial 14. The rotation amount of the lateral range designation dial 14 is detected by the encoder 109 as a digital signal.

A slit plate 67 is arranged at a position equivalent to the image forming position of the taking lens 16 at the initial position. A light projecting slit 68 is formed in the center of the slit plate 67, framing slits 71 to 76 are formed on the left side, and framing slits 78 to 83 are formed on the right side. These framing slits are formed symmetrically about the slit 68. The spacing between the framing slits 76 and 81 is L ₀ ,
The distance between 75 and 82 is L ₁ , and the distance between 74 and 83 is L ₂ , which corresponds to the distance between the selection slits 61 to 63 and the notch 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 has a slit 86 for inserting the pins 52 to 54.
˜88 are also opened, whereby the slit plate 67 is slidably held on the mask plate 56 in the YZ directions. In order to slide the slit plate 67, a tooth row portion 89 is formed at the edge of the slit plate 67 and meshes with the gear 91. The 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 of the slit plate 67. The rotation amount of the gear 92 is detected by the encoder 111 as a digital signal.

The inner reflecting mirror 93 has a xenon tube 94 as a light source and is held by a holding plate 96. The holding plate 96 has openings 97 and 98 for projecting light to the framing slits 71 to 76 and 78 to 83, respectively, and a partition plate 99 for separating these.
Are provided. The partition plate 99 has a pinhole 101 for projecting the AF spot light. As shown in FIGS. 7A and 7B, the AF slit 62a of the mask plate 56 and the slit plate 6 are formed.
The light projecting slit 68 of 7 is opened so as to be flush with the slit plate 67 at a position corresponding to an opening formed by overlapping.

Behind the finder mirror 42 is a pair of shafts 10.
2,103 are provided. A line sensor 104 is movably supported in the horizontal direction on the shafts 102 and 103, and the line sensor 104 can be slid via a wire 108 by driving a stepping motor 106. The line sensor 104 includes, for example, light receiving elements No. 1 to No. 2048 arranged in a line from bottom to top. Code 107
Indicates a reflection type photo sensor, and detects that the line sensor 104 is at the home position.

FIG. 5 is a block diagram of the present invention, in which the microcomputer 112 shows the AF unit 113, the image pickup unit 114,
It controls the image pickup unit drive unit 116 and the print unit 117.

The AF unit 113 includes a photo sensor 36, an AF control unit 118, and a driver 119. The light receiving sensor 18 receives the reflected light on the blackboard of the AF spot light projected through the taking lens 16 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. The driver 119 is connected to the stepping motor 34. Microcomputer 112 is AF control unit 118
The rotation amount and direction of the stepping motor 34 are controlled by the distance measurement signal from the photo sensor 36 and the signal from the photo sensor 36.

The image pickup unit 114 includes encoders 109 and 111 and a driver 121 that drives the line sensor 104. The microcomputer 112 is a line sensor according to the signal from the encoder 109.
The horizontal reading range of 104 is set, and in the output from the line sensor 104 according to the signal from the encoder 111, the vertical pixel area used for printing (for example, 1600 of 1st to 2048th). Pixel). A binarization circuit 110 is connected to the line sensor 104. The binarization circuit 110 associates the photoelectric output from each pixel with “1” for outputs above the threshold level and “0” for outputs below it, with reference to a predetermined threshold level. It is sent to the microcomputer 112. The microcomputer 112 controls the image recording by associating the input signal "1" with white and the input signal "0" with black, for example.

In FIG. 8 showing the state of projecting the framing mark onto the screen 131 which is an imaging target, the light emitted from the xenon tube 94 inside the main body 10 and passing through the pinhole 101 is
The AF spot light A is projected on the screen 131 via the finder mirror 42, and the light passing through the framing slit similarly projects the framing mark F.

In FIG. 6 showing the positional relationship between the slit plate 67 and the mask plate 56, the framing slits 71, 76 and 80, 81 are respectively the selection slits 63, 62 at the position shown in FIG.
Located at the top of the. This projected image becomes the framing marks F ₁ , F ₂ , F ₃ , and F ₄ on the screen 131, and the imaging range is displayed in the center. If a wider imaging range is required, the mask plate 56 may be slid in the V direction by rotating the lateral range designation dial 14 and rotating the gear 64 clockwise. As a result, as shown in FIG. 7B, the selection slits 63 and 61 are respectively replaced by the framing slits 72 and 75.
And can be moved over 79,82. Therefore,
Framing marks F on the screen 131 is as shown in F ₅ to F _8, a wider imaging range. Further, when framing upward, the vertical range designation knob 12 may be turned clockwise. Since the slit plate 67 moves in the Y direction by this right rotation, the framing mark F gradually rises with the same width, and stops by stopping right rotation. Sixth
The state shown in FIG. 6C corresponds to the upper limit of the framing mark. The imaging range E at this time is a shaded area E.

If a wider imaging range is required, turn the lateral range designation dial 14 clockwise so that the framing slit 7
Framing marks corresponding to 3,74,78,83 can be projected. At this time, the framing slits 78 and 83
Is located at the cutout portion 65 and projects a framing mark.

After that, when the image capture button 13 is pressed, as described above,
The AF control unit 118 measures the distance, and this microcomputer 112
Reference numeral 119 rotates the stepping motor 34 clockwise to move the lens barrel 31 in the initial position toward the in-focus position. Cam 38 is a sliding pin in the approach area where it turns from the initial position.
41 is pressed to rotate the mirror rotation lever 39 counterclockwise.

When the mirror rotation lever 39 rotates counterclockwise, the rotation shaft 27 rotates counterclockwise via the locking lever 29, and the lens cover 26 jumps up. At the same time, the mirror rotation lever 39 presses the pin 44, and the viewfinder mirror 42
Push up.

When the lens cover 26 and the finder mirror 42 jump up, the light passing through the taking lens 16 reaches the line sensor 104 at the start position. When the lens barrel 31 further rotates to reach the in-focus position, the microcomputer 112 stops the rotation of the stepping motor 34. In synchronism with this, the stepping motor 106 rotates clockwise to drive the line sensor 104 at the home position from right to left via the wire 108.

In this way, the line sensor 104 starts traveling, and when the line sensor 104 moves to the position corresponding to the signal from the encoder 109, a command is issued from the microcomputer 112 to the driver 121. As a result, the line sensor 104 starts reading an 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 104 is configured by arranging 2048 minute light receiving elements, so that 2048 signal outputs from these light receiving elements are obtained as image signals for one line. become.

The microcomputer 112 uses the encoder 111 among the image signals for one line thus input from the line sensor 104.
The image signals for 1600 light receiving elements in the area corresponding to the signal from are supplied to the print unit 117. For example, when the imaging range is set to the uppermost position by adjusting the vertical range designation knob 12, the lower 1 to 1600 of the image signal output from the line sensor 104 including the 1st to 2048th light receiving elements is set.
Only the signal output from the second light receiving element is supplied to the driver 122 as valid.

The driver 122 has a built-in buffer memory for one line, and when the 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. When the printing for one line is completed, the microcomputer 112 sets the driver 125
The stepping motor 124 is driven via the, and the recording paper 23 is transported 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 moves in the horizontal direction, and imaging and printing for the next one line are continued.

Printing is continued in this way, and the line sensor 104
Takes an image at the end reading position determined by the setting position of the lateral 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 move toward the home position. Then, when the photo sensor 107 detects that the line sensor 104 has returned to the home position, the stepping motor 106 stops.

When printing for one screen is completed, the microcomputer 11
A reverse rotation signal is also supplied from 2 to the driver 119, and the stepping motor 34 rotates clockwise to return the lens barrel 31 to the initial position. In this process, the cam 38 operates the mirror rotation lever 39 and the locking lever 29, and the finder mirror 42 and the lens cover 26 are returned to the initial positions shown in FIG. When the photo sensor 36 detects that the lens barrel 31 has returned to the initial position, the stepping motor
34 also stops and the entire device is restored to the initial state.

In the above-mentioned embodiment, the taking lens 16 is used and the TTL
Although the framing mark is projected by the method, it is also possible to project the framing mark by providing a projection optical system separately from the taking lens 16.

〔The invention's effect〕

As described above in detail, in the present invention, the framing projection means is incorporated in the image pickup device, and the framing mark indicating the image pickup range is projected toward the recording surface which is separated from the image pickup device main body and is placed at an appropriate shooting distance. Therefore, it is possible to confirm the image pickup range accurately and easily by comparing with the image on the recording surface, and it is possible to perform framing with few setting errors.

Further, when the framing projection means irradiates the projection light through the photographing optical system, the photographing optical system can also be utilized as a projection optical system for a framing mark, so that a low-cost and compact image pickup device can be provided. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a main part of an electronic copying apparatus according to the present invention. FIG. 2 is an external view of the electronic copying apparatus shown in FIG. FIG. 3 is a plan view of the mask plate used in the embodiment of FIG. FIG. 4 is a plan view of the slit plate used in the embodiment of FIG. FIG. 5 is a block diagram showing the electrical construction of the electronic copying apparatus of FIG. FIG. 6 (A) shows the arrangement of the slit plate and the mask plate for obtaining the imaging range of the narrow range / center part, and (B) shows the arrangement for obtaining the imaging range of the middle range / center part, (C) is an operation explanatory view showing an arrangement for obtaining the middle range and the uppermost imaging range. FIG. 7A is a vertical sectional view of the slit plate and the pinhole portion, and FIG. 7B is a plan view of the slit plate and the pinhole portion. FIG. 8 is a diagram for explaining the operation of the electronic copying apparatus shown in FIG. 11 ... Imaging unit 12 ... Vertical range specification knob 13 ... Imaging button 14 ... Horizontal range specification dial 16 ... Photo lens 18 ... Photo sensor 31 ... Lens barrel 38 ... Cam 39 ... Mirror rotation lever 42 ... Finder mirror 46 ... Board 56 ... Mask plate 61-63 ... Select slit 67 ... Slit plate 71-76, 78-83 ... Framing slit 94 ... Xenon tube 96 ... Holding plate 101 ... Pinhole 102, 103 ... Shaft 104 ... Line sensor 109, 111 ... Encoder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Nishitani 2-26-30 Nishiazabu, Minato-ku, Tokyo Fuji Photo Film Co., Ltd. (56) References

Claims (2)

(57) [Claims] 1. An image to be picked up is separated from a recording surface and used at an arbitrary shooting distance. An image of the recording surface is formed on the image pickup surface by a shooting optical system, and is formed on the image pickup surface. An image pickup apparatus for converting an image on a recording surface into an image signal and reading the image by an image pickup means, and framing for projecting a framing mark indicating a range imaged by the image pickup means onto the recording surface. An image pickup apparatus comprising projection means. 2. The image pickup apparatus according to claim 1, wherein the framing projection means projects the framing mark through the photographing optical system.