JPH0534836A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent a mirror from being opened by use of a cover locking means, except the time of detecting that a mirror unit is set on an original platen. CONSTITUTION:A stopper 127 is engaged with the latch 126 of a mirror cover 122 so as to close the mirror cover 122, but, when the mirror unit 61b is installed on the original platen 2, the attachment of the mirror unit 61b on the original platen 2 is detected by an attachment/detachment detector 129. The engagement of the stopper 127 is released by a releasing solenoid 128 based on the detection signal of the attachment of the mirror unit 61b by the attachment/detachment detector 129. Thus, the mirror cover 122 is open, and the mirror 66 is moved to a prescribed image reflecting position, so that the image projected from a projector unit can be formed on the original platen.

Description

Detailed Description of the Invention

 [Object of the Invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an image forming apparatus (copier) having a film adapter for copying an image such as a slide film.

[0002]

2. Description of the Related Art Conventionally, as means for copying a slide film, a projector unit for irradiating the film with light to form an image, and an image projected from the projector unit are reflected and connected to a document table. The mirror unit and the image are used. During normal copying, the light source in the main body of the copying machine is turned on to illuminate the document placed on the document table, and the reflected light is used to make a copy. When copying a film, place the mirror unit on the platen, turn on the lamp of the projector unit, send the transmitted light of the film to the platen, and make a copy using the image formed on the platen. To do. The mirror of the mirror unit is installed inside an openable / closable lid for switching between normal copying and film copying and for preventing dirt. Then, at the time of film copying, the mirror unit is set on the original table and the operator opens the lid. After that, the film copy can be performed by switching the copying machine to the film copy mode.

[0003]

Conventionally, since an operator manually opens and closes the lid of the mirror unit, there is a possibility that the mirror unit may be dropped and damaged by this momentum when the mirror unit is removed after film copying is completed. there were. Also, even when setting the mirror unit on the platen, it is necessary to open the lid by hand after placing the mirror unit in a predetermined position, which is troublesome and it is easy to make an operation error such as forgetting to open the lid. There was a problem.
Therefore, it is an object of the present invention to provide an image forming apparatus that uses a mirror unit that does not accidentally open the lid during transportation and has good operability for attachment / detachment. [Constitution of Invention]

[0004]

In order to achieve the above object, the image forming apparatus of the present invention is mounted on a document table,
The projector unit that irradiates the film with light to project an image, and the mirror that is detachably mounted on the document table and reflects the image projected from the projector unit, and the mirror reflects the projected image on the document table A mirror unit that can be moved to a position where an image is formed, an attachment / detachment detector that detects attachment of the mirror unit onto the document table, and a mirror of the mirror unit is moved to the document table image formation position. Urging means for urging the urging means, fixing means for locking the movement of the mirror to the image forming position of the document table by the urging means, releasing means for releasing the fixing operation of the fixing means, and the mirror by the attachment / detachment detector. And a control means for instructing the releasing means to perform a fixing operation releasing operation on the basis of a signal that the mounting of the unit is detected.

[0005]

In the image forming apparatus of the present invention, when the mirror unit is mounted on the document table, the attachment / detachment detector detects the mounting of the mirror unit on the document table. The control means, based on the attachment detection signal of the mirror unit by the attachment / detachment detector,
The releasing means is instructed to perform the fixing operation releasing operation, and the releasing means releases the fixing operation of the fixing means by this instruction. as a result,
The mirror of the mirror unit, which is biased by the biasing means so as to be moved to the document table imaging position, is moved to the document table imaging position.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a thermal transfer type color copying machine capable of selectively copying a film image as an example of the image forming apparatus of the present invention.

Reference numeral 1 denotes a copying machine main body, and an operation panel 50 is provided on the front portion of the upper surface of the main body 1. And the main body 1
A document table (transparent glass) 2 for setting a document (not shown) at the time of normal copying is fixed to the upper part of the document, and a document cover 5 as a document holder is provided so as to be openable and closable. Further, on the right side surface of the main body 1, a paper feeding cassette 2 for collectively storing papers as recording media
0 is detachably attached.

During film copying, for example, a projector unit 61a and a mirror unit 61b, which form an image projection device (film adapter) 61, are set on the upper surface of the main body 1. The projector unit 61 is for projecting a film image toward the mirror unit 61b, and includes a light source for irradiating the film with light, a focusing lens (details will be described later), and the like. There is. The mirror unit 61b is a mirror 6 for reflecting the film image from the projector unit 61a.
6, a Fresnel lens 67 for correcting uneven light distribution, and a screen 68 onto which the film image is projected. FIG. 3 shows the internal structure of the copying machine body 1.

Inside the main body 1, a document scanning unit 3 for scanning and reading a document set on a document table 2, and an image forming unit 4 below the document scanning unit 3 are arranged. The document scanning unit 3 includes, for example, the first carriage 7, the second carriage 8, the lens 1
6, a mirror unit 10, a photoelectric converter 11, and a drive system (not shown) that changes the position of each unit. The first carriage 7 has an exposure lamp 6 for irradiating the original with light, a reflector 12 as a reflection mirror for collecting the light from the exposure lamp 6 on the original surface, and a second carriage 8 for the light from the original table 2. Mirror 1 leading to the side
3 is installed. The second carriage 8 is equipped with mirrors 8a and 8b for guiding the light guided by the mirror 13 to the lens 16. The first and second carriages 7 and 8 are connected to each other by a timing belt (not shown) so that the second carriage 8 moves in the same direction at half the speed of the first carriage 7. It has become. As a result, the optical path length to the lens 16 is kept constant and scanning is performed. The lens 16
Is a lens with a fixed focal length, which is designed to be moved in the optical axis direction during zooming. Further, it may be a lens having a variable focal length such as a zoom lens. The mirror unit 10 is composed of two mirrors 10a and 10b, and their positions are changed according to the change of the optical path length corresponding to the selected magnification. The light from the lens 16 is guided to the photoelectric converter 11 by bending the optical path with the two mirrors 10a and 10b.

The photoelectric converter 11 photoelectrically converts the light guided by the mirror section 10 to convert the original image into cyan (C), green (G), yellow (Y) or red (R), Separately output as color signals of green (G) and blue (B) light. For example, CC
It is mainly composed of a D-type line image sensor. In this case, for example, one pixel of the original image corresponds to three consecutive elements (C, G, Y or R, G, B) of the CCD sensor. The output of the photoelectric converter 11 is output to an A / D converter described later. The first and second carriages 7, 8, the lens 16, the mirror 10
The movements of a and 10b are performed by stepping motors as scanning motors.

The image forming section 4 is provided with a platen drum 22 at a substantially central portion thereof. The platen drum 22 is made of an elastic material such as rubber around the platen drum 22,
It has a function as a platen roller of the thermal head 24. The platen drum 22 winds the paper (recording medium) P by rotating in the clockwise direction so that the paper P is not displaced even in the overlay printing.
In addition, around the platen drum 22 at predetermined intervals,
Pressure rollers 25, ... Are provided to prevent the paper P from floating from the platen drum 22. The circumference of the platen drum 22 is slightly longer than the length of the maximum paper size in the longitudinal direction.

A thermal head 24 is disposed in the lower left portion of the platen drum 22. The thermal head 24 is attached to a radiator integrally formed on the rear end surface of the holder. An ink ribbon 26 as an image forming medium is interposed between the platen drum 22 and the thermal head 24.

Cores 30, 31 of the ink ribbon 26
Is connected to a drive shaft of a motor (not shown) via a drive force transmission mechanism (not shown), and is rotationally driven as necessary.

A paper feed roller 41 is provided below the main body 1.
Is provided so that the sheets P stored in the sheet feeding cassette 20 can be taken out one by one. The paper P taken out by the paper feed roller 41 is sent by the carrying roller 42 to the registration roller 21 arranged diagonally above and to the left, and the leading end thereof is aligned. After this, the registration roller 21
The platen drum 22 through the guides 43, 43
To the gripper 23 and the pressure roller 2
The state of being wound around the platen drum 22 by 5, ... Is fed accurately.

Reference numeral 46 in the drawing denotes a manual paper feeding device for manually feeding the paper P or the like. The paper P supplied from the manual paper feeding device 46 is also wound around the platen drum 22 in the same manner as described above.

The sheet P, the front end of which is fixed by the gripper 23, is rotated clockwise to cause the platen drum 2 to rotate.
Wrapped around 2. After the leading edge of the thermal head 24 passes through the printing area, the thermal head 24 moves to the platen drum 22.
Printing is performed by applying pressure to.

When the printing of the first color is completed, the platen drum 22 is supposed to have rotated almost once. here,
The thermal head 24 is released once, and the ink ribbon 26
Is wound up and the next color is cued. Then, the platen drum 22 starts to rotate clockwise again, the thermal head 24 performs printing, and the next color is overprinted (printed).

As described above, in the case of full-color copying, image formation is performed by four operations of yellow, magenta, cyan and black, or three operations of yellow, magenta and cyan. In the case of a single color such as black, the operation is performed once.

When ejecting the sheet, the platen drum 22 is rotated clockwise until the trailing edge of the sheet P reaches the sheet ejection guide 27.
Rotate 2 counterclockwise. Then, the rear end of the paper P is separated from the platen drum 22 by a separation claw (not shown) and is guided to the paper discharge guide 27. Thus, finally, the front end of the paper P is released from the gripper 23, and the paper ejection guide 27
By being transported by, the paper P that has been copied is discharged onto the paper discharge tray 28.

Here, at the accommodating position of the paper feeding cassette 20 of the main body 1, a cassette size for detecting the size of the paper P accommodated in the set paper feeding cassette 20, that is, the width and the length. A detector 60a is provided. The cassette size detector 60a is turned on / off by a claw (not shown) provided on the paper feeding cassette 20.
It is composed of a plurality of micro switches that are turned off.

Further, the manual paper feeding device 46 in the main body 1
At the setting position of, a manual sheet size detector 60b for detecting the size of the manually fed sheet P, that is, the width and the length is provided. The manual sheet size detector 60b is for performing width detection by a light transmission type detector and length detection by an actuator using a magnetic proximity switch. That is, a plurality of LED transmissive optical sensors are provided for each standard size such as A3 size and A4 size, and the width of the paper P is detected by the outputs from these optical sensors. Further, the length of the paper P is detected by an actuator that moves with the passage of the paper P based on the time when the magnetic proximity switch is on and the transport speed of the paper P. FIG. 4 shows a case where a projection image is copied, that is, a film image is copied.

At the time of film copying, a projector unit 61a and a mirror unit 61b which constitute the image projecting device 61 are placed on the upper part of the main body 1. Then, the projected image from the projector unit 61a is reflected by the mirror 66 of the mirror unit 61b set on the document table 2.
The image is projected on the screen 68 via the Fresnel lens 67. As a result, the film image is formed on the document table 2. The projection magnification on the screen 68 is predetermined to be, for example, 5.4 times.

The projector unit 61a includes a light source 62.
The light from the condenser film 63, 63 is condensed by the condenser lenses 63, 63, and is supported by the film adapter 64.
3) is irradiated. Then, the image of the film irradiated with the light is projected to the outside through a projection lens 65 whose focus position is moved by a focus mechanism described later.

FIG. 5 shows an example of the film holder. (A)
Indicates a slide 201, which is set in the projector unit 61a with a slide film 203 sandwiched between slide mounts 202. The thickness t of the slide mount 202 is not constant, and there are thick ones and thin ones.

FIG. 5B shows the film carrier 205. Negative film is usually inconvenient due to additional printing if it is cut into individual frames.
It is sandwiched between the film carriers 205 and set on the film adapter 64.

6A and 6B show the structure of the projector unit 61a. When the slide film 203 is attached by the holders of various thicknesses as described above, a difference in the distance L between the projection lens 65 and the slide film 203 occurs, so that a projected image is formed on the document table 2 under a certain condition. However, under other conditions, the image plane shifts vertically. In this example, the body operation panel 50 is operated to key in the type of slide mount (thick mount, thin mount, or negative carrier).

7 and 8 are operation explanatory views of an operation for adjusting the focus position of the main body optical system to the projection image forming plane when the image forming plane is displaced. FIG. 7A shows an example adjusted so that a projected image is formed on the document table 2. In FIG. 7B, the distance L between the projection lens 65 and the slide film 203 is (a).
Read lens 16 and mirror 10 if longer than
An example is shown in which a and 10b are moved in the arrow directions (leftward in FIG. 8) and the optical path length is changed to adjust the focus position of the main body optical system to the projection image plane. In FIG. 7C, when the distance L between the projection lens 65 and the slide film 203 is shorter than in the case of FIG. An example is shown in which the focus position of the main body optical system is adjusted to the projection image plane by changing the length. In this way, the reading optimum focus plane of the main body optical system is matched with the projection image plane.

If the image plane is vertically displaced, as an alternative method,
A pointing arrow 65 attached to the projection lens 65 as shown in FIG.
It is also possible to match a with the indication scale 206a of the projector case 206. That is, a spiral groove 65b is cut in the projection lens 65, and when the lens 65 is rotated, the slide film 203 and the projection lens 65 are rotated.
The distance L to and changes.

FIG. 9 is an explanatory view of the operation of aligning the projection image formation surface of the film projector with the scale of the projection lens on the original table when the image formation surface is displaced. (A) is the manuscript table 2
An example in which the projection image is adjusted so as to form an image above is shown.
In FIG. 9B, when the distance L between the projection lens 65 and the slide film 203 is longer than that in FIG. An example of adjusting to the image plane will be shown. When the distance L between the projection lens 65 and the slide film 203 is shorter than that in (a), the projection lens 65 is moved in the direction of the arrow (downward in FIG. 9) so that the focus position is projected on the document table. An example of adjusting to the image plane will be shown. In this way, the projection image plane may be always fitted on the original table 2. In this case, the conditions of the main body optical system are unchanged.

10 and 11 show a mirror unit 61b detachably installed in the main body of the copying machine. A mirror unit positioning member 120 is provided on the main body side, and the mirror unit 61b includes the mirror unit positioning member 12
Positioning holes 121 are provided corresponding to 0. And
The mirror unit 61b is placed on the main body 1 by inserting the main body side positioning member 120 into the mirror unit side positioning hole 121, and the positioning with the main body 1 is thereby performed. An attachment / detachment detector 129 is provided near the positioning hole 121.
Is provided and detects that the positioning member 120 has been inserted into the positioning hole 121 up to the regular position.

The mirror 66 is attached to the mirror cover 122, and the mirror cover 122 is attached to the mounting shaft 12.
It is rotatably attached to the mirror unit base 125. In addition, the mirror cover 122 has a pin 131
A lever 130 with a mark is rotatably attached.
The pin 131 is inserted into a guide hole 132 provided in the mirror unit base 125, and the pin 131 is attached to the mirror cover 122.
The guide hole 132 is moved (from the right end to the left end in FIG. 10) as the sheet is opened. A spring 124 is attached to the shaft 123, and biases the mirror cover 122 in the direction in which the cover opens. A latch portion 126 is provided at the tip of the mirror cover 122. As shown in FIG. 11, the latch portion 126 engages with the stopper 127 attached to the mirror unit base side to keep the mirror cover 122 in the closed state.
The stopper 127 is set to be movable by a solenoid 128. The mirror cover position detector 133 (see FIG. 1) detects that the mirror cover 122 has stopped at a predetermined angle. This signal is sent to the main body of the copying machine, and the main body of the copying machine receives the signal and enables the film copy mode. FIG. 1 schematically shows the overall control system.

That is, the main control section 81 has the operation panel 5
0, the correction circuit 84, the luminance / color difference separation circuit 85, the image quality improvement circuit 86, the color signal conversion circuit 87, the binarization circuit 88, the first sub-control unit 82, the second sub-control unit 83, and the image projection device 61. Attachment detector 129, mirror cover position detector 1
33, the release solenoid 128, etc., respectively, and controls these.

The main controller 81 and the image projection device 61
Means that when the projector unit 61a is installed on the upper portion of the main body 1, the connector (not shown) on the projector unit 61a side and the connector (not shown) on the main body 1 side are electrically connected to each other. It has become so.

On the operation panel 50, in addition to a start button and a numeral setting key, a mode setting key for setting a film copy mode and a selection key for inputting the film size and its direction (all are shown in FIG. (Not shown) are provided. In the case of this embodiment, for example, a key corresponding to the type of holder is prepared as the selection key.

The first sub controller 82 is the light source controller 8
9, the motor drive unit 90, the photoelectric converter 11, the A / D converter 91, and the resolution conversion unit 92, which are connected to each other and control these.

The light source control unit 89 is connected to the exposure lamp 6 and controls the lighting and light amount of the exposure lamp 6. That is, the exposure lamp 6 is turned on during normal copying. The motor drive unit 90 drives the scanning motor 18.

The second sub-control unit 83 is connected to the thermal head temperature control unit 93, the thermal head 24, various detection switches 94, a drive unit 95, a cassette size detector 60a, and a manual sheet size detector 60b, respectively. Manages these controls. The drive unit 95 is connected to a drive system 96 such as a motor and a solenoid and drives the drive system 96.

The attachment / detachment detector 129 of the image projection device 61 is
It is detected that the positioning member 120 of the mirror unit 101 has been inserted into the positioning hole 121 to the regular position.
The mirror cover position detector 133 detects that the mirror cover 122 has stopped at a predetermined position. Release solenoid 1
28 is for moving the stopper 127.

The correction circuit 84 performs shading correction on the image data (after resolution conversion) obtained by A / D converting the reflected light corresponding to the original image, that is, correcting the variation of the photoelectric converter 11.

The color signal conversion circuit 87 receives the luminance signal (I) and the color difference signal 1 sent from the image quality improvement circuit 86.
(C1), the color difference signal 2 (C2), and the color signal selection signal from the main controller 81.
One of Magenta M, Cyan C, or Black B
One color signal is output in synchronization with a clock obtained by dividing a clock signal from an oscillator (not shown) into 1/3. Yellow Y, Magenta M, Cyan C, Black B
Is switched by the count value obtained by counting the page synchronization signal supplied from the main control unit 81 by a counter (not shown). Next, the operation of the above configuration will be described.

The mirror cover position detector 133 detects that the mirror cover 122 has stopped at a predetermined angle. This signal is sent to the main body of the copying machine, and the main body of the copying machine receives the signal and enables the film copy mode.

For example, when a film image is to be used for copying now, the projector unit 6 is provided above the copying machine main body 1.
1a and the mirror unit 61b are installed. When the user sets the mirror unit on the document table, the positioning member 120 enters the positioning hole 121, and the attachment / detachment detector 129 detects this. This signal is sent to the control circuit, and when the control circuit confirms that the attachment / detachment detector 129 continues to send the mirror unit set signal for a certain period of time, the solenoid 128 is operated for a certain period of time to release the latch 126 from the stopper 127. As a result, the mirror cover 122 has the spring 124.
The power of automatically opens. At this time, a shock absorber (not shown) is activated, and the mirror cover 122 starts to open slowly.
Lever 13 with pin 131 on mirror cover 122
Since 0 is rotatably attached, the pin 131 moves in the guide hole 132 as the mirror cover 122 opens. When the pin 131 reaches the end of the guide hole 132, the movement of the pin 131 is stopped, the mirror cover 122 is also positioned at a predetermined angle, and the optical image from the projector unit can be reflected at a predetermined position.

The film copy mode is set by pressing the mode setting key on the operation panel 50. Further, a predetermined selection key is operated according to the type of film mounting by the operation panel 50 and the like.

Then, a film carrier 7 in which a film corresponding to the above-mentioned film size and its direction is housed in the film adapter 64 of the projector unit 61a.
0 is set. Then, the start button on the operation panel 50 is operated to start copying the film image.

That is, the reflected light of the light emitted from the exposure lamp 6 to the document is imaged on the photoelectric converter 11. The photoelectric converter 11 separates the light into analog color signals of cyan (C), green (G), and yellow (Y),
Send to the A / D converter 91. The A / D converter 91 converts each analog color signal into a digital signal and outputs the digital signal to the resolution conversion unit 92. The resolution conversion unit 92 performs resolution conversion so as to match the resolution of the photoelectric converter 11 and the resolution of the thermal head 24, and sends the result to the correction circuit 84. In the correction circuit 84, the resolution conversion unit 9
Shading correction (correction of exposure distortion in the image reading unit 3, variation in sensitivity of photoelectric conversion element, etc.) is performed on the variation in the photoelectric converter 11 for each of the C, G, and Y color signals sent from the device 2. , And sends the result to the luminance / color difference separation circuit 85. The luminance / color difference separation circuit 85 includes a correction circuit 84.
Various calculation processes are performed on the C, G, and Y color signals sent from the device to obtain a luminance signal (I) and a color difference signal 1 (C
1), the color difference signal 2 (C2) is separated into each signal and sent to the image quality improving circuit 86. The image quality improving circuit 86 analyzes the luminance signal, the color difference signal 1, and the color difference signal 2 sent from the luminance color difference separating circuit 85, performs image quality improving processing such as edge enhancement and character specification, and sends them to the color signal converting circuit 87. .. As a result, the color signal conversion circuit 87 performs color conversion based on the luminance signal, the color difference signal 1, and the color difference signal 2 that have been subjected to the image quality improvement processing, and according to the color selection signal from the main control unit 81, the yellow ( Y), magenta (M), cyan (C), black (B) [the three primary colors (Y, M, C) at the time of printing plus B] are converted into one color signal (a signal corresponding to the density),
It is sent to the binarization circuit 88. The binarization circuit 88 converts the color signal (any one of Y, M, C, and B) sent from the color signal conversion circuit 87 by area dithering or the like, that is, binarization. And sends the binarized signal to the thermal head temperature control section 93 via the switching circuit 98.
The thermal head temperature control unit 93 sends a print signal to the thermal head 24 based on the binarized signal supplied from the binarization circuit 88. On the other hand, the paper P in the paper feed cassette 20 (or the manual feed guide 46) is taken out, and the platen drum 22
It has been transported to and wrapped around here. Then, the thermal head 24 performs printing (that is, image formation) on the paper P wound around the platen drum 22 according to the print signal.

After the film copy is completed, the operator manually pushes the mirror cover 122 downward. As a result, the mirror cover 122 is closed against the force of the spring 124. Since the lever 130 with the pin 131 is rotatably attached to the mirror cover 122, the pin 131 moves in the guide hole 132 as the mirror cover 122 is closed (from the left end to the right end in FIG. 10). Pin 1
When the pin 31 reaches the right end of the guide hole 132, the pin 131
Is stopped, the latch 126 is engaged with the stopper 127 (see FIG. 11), and the mirror cover 122 is closed.

According to this apparatus, the mirror cover 122 is automatically opened according to the signal from the mirror unit attachment / detachment detector 129, so that it is not forgotten to open it. Further, since the mirror cover 122 is not opened carelessly during transportation of the mirror unit, the possibility of damage is prevented.

[0048]

According to the present invention, the cover locking means prevents the mirror from being opened except when it is detected that the mirror unit is set on the document table. For this reason, it is possible to prevent the mirror unit from being forgotten to be opened and being damaged during transportation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the outer appearance of the image forming apparatus.

FIG. 3 is a configuration diagram showing an inside of a main body of the image forming apparatus.

FIG. 4 is a side view showing the basic configuration of the image projection apparatus.

5A is a perspective view showing an example of a slide, and FIG. 5B is a perspective view showing an example of a negative carrier.

FIG. 6A is a plan view of a projector unit,
(B) is a front view of the unit.

FIG. 7 is an operation explanatory view when the focus position of the main body optical system of the image projection apparatus is aligned with the projection image plane.

FIG. 8 is an explanatory diagram of an operation when the focus position of the main body optical system is adjusted to the projection image plane.

FIG. 9 is an operation explanatory diagram in the case where the projection imaging plane of the projector unit of the image projection apparatus is aligned with the original table by the scale of the projection lens.

FIG. 10 is a schematic sectional view of a mirror unit.

FIG. 11 is a schematic sectional view of a stopper portion of the mirror unit.

[Description of Codes] 1 ... Copying machine main body, 2 ... Document table, 3 ... Document scanning unit, 4 ... Image forming unit, 6 ... Illumination lamp, 11 ... Photoelectric converter, 50 ...
Operation panel, 61 ... Image projection device (film adapter), 61a ... Projector unit, 61b ... Mirror unit, 69 ... Detector, 70 ... Film carrier, 7
0a ... Positive film carrier, 70b ... Full size negative film carrier, 70c ... Half size negative film carrier, 81 ... Main control unit, 84 ... Correction circuit, 8
8 ... Binarization circuit, 66 ... Mirror, 120 ... Mirror unit positioning member, 121 ... Positioning hole, 122 ... Mirror cover, 123 ... Mounting shaft, 124 ... Spring, 12
5 ... Mirror unit base, 126 ... Latch part, 127
... stopper, 128 ... solenoid, 129 ... attachment / detachment detector, 130 ... lever, 131 ... pin, 132 ... guide hole, 133 ... mirror cover position detector.

Claims (1)

Claim: What is claimed is: 1. A projector unit mounted on a document table, projecting an image by irradiating a film with light, and detachably mounted on the document table and projected from the projector unit. A mirror for reflecting the image, the mirror being movable to a position where the projection image is formed on the platen, and an attachment / detachment detector for detecting mounting of the mirror unit on the platen. Urging means for urging the mirror of the mirror unit to move to the document table imaging position, and fixing means for locking the movement of the mirror to the document table imaging position by the urging means, Based on a release unit that releases the fixing operation of the fixing unit and a signal that the attachment / detachment detector detects attachment of the mirror unit, the release operation is performed by the releasing unit. Image forming apparatus having a Shimesuru control means.