JPH02190837A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To facilitate framing, to simplify the constitution of a device and to make the device compact and the cost of the device low by providing a mark projection means for projecting a framing mark for displaying an image pickup range on a recording surface and a range-finding mark for focusing. CONSTITUTION:A light projecting window 20 and a light receiving window 22 for using at the time of range-finding and at the time of framing are provided above and below a lens cover 18 so that the cover 18 is put between both windows. At the time of framing, a frame for framing is projected on the surface of a blackboard with light projected from the light projecting window 20. At the time of range-finding, the light projected from the window 20 is made incident on the light receiving window 22 so as to detect a distance from a main body 10 to the blackboard. Thus, framing is easily performed with the simple constitution, the device is made compact, and the cost of the device is made low.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic copying device that captures an image of a recording surface and prints the image on a predetermined recording paper.

[Conventional technology]

2. Description of the Related Art A variety of electronic copying devices that include a built-in video camera and printer have been proposed in order to obtain hard copies of characters and diagrams written on recording surfaces such as blackboards and whiteboards.

These electronic copying devices measure and focus using special light (for example, infrared light) that can be distinguished from surrounding light, and then use an optical system to form an image on an imaging unit such as a CCD image sensor. This is then recorded on recording paper using a printer.

When using such an electronic copying device, first, so-called framing is performed to align the imaging range (field of view) with the recording surface. Conventionally, this framing has been performed by looking through a finder formed on the top surface of the device body, but it may be difficult to perform framing depending on the installation location of the device.

A method has also been proposed in which images are captured in a wide field of view including the recording surface, all image signals are temporarily written into a frame memory, and a necessary range is determined and printed out.

[Problem to be solved by the invention]

However, with an optical viewfinder, depending on the installation location, such as when the main body of the device is installed in the center of a desk, it may be difficult to see through the viewfinder, making framing operations difficult. In addition, in devices that use frame memory, the frame memory itself not only increases costs and complicates the circuit configuration, but also reduces efficiency because only a portion of the obtained image signal is used for printout. But there was a problem.

[Object of the Invention] The present invention has been made in view of the above points, and it is possible to easily perform framing, simplify the configuration of the device,
The purpose is to make the device more compact and lower in cost.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a light emitting means and a mark projection means for projecting a framing mark for displaying an imaging range on the recording surface and a distance measurement mark for focusing using light from the light emitting means. ing.

[Operation] Since the present invention is configured as described above, the positional relationship between the imaging range of the device and the recording surface can be easily confirmed regardless of the installation location of the device.

In addition, since both distance measurement light and framing light are obtained from one light source, various components such as the light source drive circuit and projection lens that accompany this light source are also affected by the L! !・The required minimum amount is required, and the configuration of the device is simplified.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows the external appearance of the electronic copying device according to this embodiment. In the figure, an imaging section 12 is formed at the front of the upper part of the main body 10, and a handle 14 is formed at the rear of the imaging section 12 for easy carrying when moving. Also,
An imaging aperture 16 is formed on the front surface of the field image section 12, and a transparent lens cover 18 is attached to cover the aperture 16.

On the top and bottom of the lens cover 18, distance measuring devices are placed between them.
A light projecting window 20 and a light receiving window 22 are provided for use during framing. At the time of framing, a framing frame is projected onto the blackboard surface using the light emitted from the light emitting window 20, and during distance measurement, the light emitted from the light emitting window 20 is made to enter the light receiving window 22 and the main body 10 is The distance from the point to the blackboard is detected. Note that details of these effects will be described later.

Further, on the top surface of the imaging unit 12, there are a framing start button 23 for starting framing, an imaging start button 24 for starting imaging, and a horizontal range for imaging.
A horizontal range designation dial 26 for switching between stages and a vertical range designation knob 28 for designating a range in the gentle direction are provided.

On the other hand, on the side of the main body 10 there are two large and small! 30°32 is provided so that it can be opened and closed freely. A print unit for recording an image on the blackboard surface is built inside the lid 30. Further, an ejection port 36 is formed between the lower end of the M32 and the main body 10 to eject the thermal recording paper 34 on which an image has been recorded.

FIG. 1 shows the configuration of the main parts of this embodiment. In the figure, 38 is a photographing lens arranged inside the lens cover 18, and a drive motor 4 is connected to the lens through a gear 40.
By rotating the lens 2, the lens moves forward and backward along the optical axis for focusing.

44 is a strobe light emitting tube, 46 is an infrared filter, 48 is a slit plate, and 50 is a light projection lens, and each of these members constitutes a light projection section.

Here, the strobe light emitting tube 44 is controlled by the floodlight drive circuit 52 and emits light intermittently. In addition, the infrared filter 46 has an infrared light transmitting section 47 formed in the center that cuts visible light and transmits only infrared light, and a portion other than this infrared light transmitting section 47 cuts infrared light. It is designed to transmit visible light. The slit plate 48 is a light shielding plate in which a template-shaped and circular through hole is formed, and the strobe light emitting tube 48
The light from the infrared light transmitting section 47 is shaped into a frame shape for framing, and the infrared light from the infrared light transmitting section 47 is shaped into a circular pattern. Further, the projection lens 50 projects the light that has passed through the slit plate 48 onto the surface of the blackboard 56. With this configuration, the distance measuring light (infrared light) Ll and the framing light (visible light) L2 are separated.

As shown in FIG. 3, the light separating means includes a mirror 57 having an infrared light reflecting section 55 in the center that reflects only infrared light from the light that has passed through the slit 4. It is also possible to use

On the other hand, 58 is a lens that focuses the light reflected on the surface of the blackboard 56. Reference numeral 60 denotes an infrared filter that blocks visible light and transmits only infrared light, and is designed to select distance-measuring light L1 from the light reflected by the blackboard 56. Reference numeral 62 denotes a light receiving sensor that receives infrared light L1 for distance measurement, and a photoelectric signal outputted thereby is supplied to a distance measurement detection circuit 64.

The distance detection circuit 64 performs calculations based on the photoelectric signal and obtains a distance measurement signal.

The control device 66 controls the projector drive circuit 52. It is connected to the distance measurement detection circuit 64 and the driver 68 that drives the drive motor 42, and is designed to comprehensively control each of these circuits.

Next, the operation and effect of the above embodiment will be explained. The main body 10 is placed R on a desk placed in advance in front of the blackboard 56, the M2O is opened, and the main switch is turned on.

Thereafter, the horizontal range designation dial 26 is used to manually set the blackboard 56 to a position corresponding to the horizontal size. When the lateral range designation dial 26 is operated, one slit film 48 is selected according to the designation dial and set on the optical axis.

Next, when the start button 21 is pressed, the control device 66
, the strobe light bulb 44 is activated by the action of the floodlight drive circuit 52.
emits light intermittently, and the infrared transmitting section 54 of the infrared filter 46
The light that has passed through the other portions enters the slit plate 48.

The light incident on the slit sunscreen 48 is projected onto the blackboard 56 from the light projection window 20 through the light projection lens 50 as a frame-shaped light.

Then, while looking at this joint frame for framing, the main body 10 of the apparatus is moved on the desk to perform framing. That is, when you operate the vertical range designation knob 28 while looking at the framing mark on the blackboard 56, the slit board 48 slides up and down, and the framing mark also moves up and down, so you can set the vertical range at an appropriate position. The imaging range is determined by combining the designated knobs 2 and 2.

Next, when the imaging start button 24 is pressed, the slit plate 48 is moved away from the optical axis, and the infrared light of the light incident on the infrared filter 46 is transmitted through the infrared light transmitting section 47, and is transmitted through the light projection lens. 50. The infrared light L1 incident on the light projecting lens 50 is reflected from the light projecting window 20 near the center of the black Fi, 56, and enters the lens 58 through the light receiving window 22. The infrared light L1 for distance measurement that has entered this lens 58 is focused here and then enters the infrared filter 60, cuts off the surrounding visible light, and only the infrared light is received by the light receiving sensor 62. .

The light receiving sensor 62 photoelectrically converts the incident light and supplies it as a ranging signal to the ranging detection circuit 64.

The distance detection circuit 64 detects the main body 1 from the input distance measurement signal.
0 and the blackboard 56 and supplies this distance measurement information to the control device 66. Then, the control device 66 controls the driver 6.
8, and based on the input ranging information, the drive motor 42 is moved forward from the infinite position for focusing.

When focusing is completed, the strobe light tube 4
4 is turned off and the imaging light L3 that has passed through the photographing lens is received by an image sensor (not shown), and then image information is printed on a recording paper 34 and sent out from the discharge port 36.

Next, another embodiment of the present invention shown in FIGS. 4 and 5 will be described.

In the apparatus shown in FIG. 4, a drive circuit for a light source 72 for distance measurement and a light source 74 for framing is integrated into a single projector drive circuit 7.
It is summarized in 6. In addition, in the figure, 78.80 is a visible light cut filter, 82 is a slit plate, 84, 86.8
8 is a lens, 90 is a light receiving sensor, 91 is a distance measurement detection circuit, and other functions are the same as in the embodiment described above.

The apparatus shown in FIG. 5 is equipped with one light source 94 and two projector drive circuits 92 for driving it, similar to the embodiment shown in FIG. Then, an infrared filter 96 and a projection lens 98 are arranged in front of the light source 94, and the infrared light transmitted through these is made to enter the blackboard 56, and the light reflected here is sent to the lens 100, the infrared filter 102, and the light receiving sensor 104. A distance measurement detection circuit 10
6 to form distance measurement information.

On the other hand, a slit plate 108 is disposed on the lower surface of the light source 94, and the light that has passed through the slit plate is reflected by a mirror 110, and further transmitted through a projection lens 112, so that the light passes through the blackboard 5.
The joint frame of the slit is projected onto 6.

As described above, according to each of the embodiments described above, the configuration of the light projecting section of the electronic copying apparatus can be simplified.

It should be noted that the present invention is not limited to the above-mentioned embodiment in any way, and can be applied to devices having similar functions in addition to electronic copying devices.

(Effects of the Invention) In the present invention, framing is performed by projecting a predetermined mark onto the recording surface, and since both distance measurement light and framing light are obtained from one light source, the configuration is simple. This has the effect of allowing easy framing.

Furthermore, the simplification of the configuration has the advantage of making the device more compact and lower in cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a perspective view showing the external appearance of the electronic copying device according to the embodiment. FIG. 3 is a front view showing another configuration of the main parts of the embodiment. FIG. 4 is a plan view showing another embodiment of the present invention. FIG. 5 is a front view showing another embodiment of the present invention. 44... Strobe light emitting tube 46... Infrared filter 47... Infrared light transmitting section 48... Slit plate I I, 2 - Blackboard, infrared light for ranging, visible light for framing, imaging light.

Claims (1)

[Scope of Claim] An electronic copying device that images a recording surface after focusing based on distance measurement information and prints out the image of the recording surface on recording paper, comprising: a light emitting means; and a light emitting means that uses light from the light emitting means. An electronic copying apparatus characterized by comprising mark projection means for projecting a framing mark for displaying an imaging range and a distance measurement mark for focusing on the recording surface.