JPH05273663A - Slide projector - Google Patents

Abstract

PURPOSE:To make a projector small in size and light in weight by driving a scanning exposure mechanism, an automatic focusing mechanism and an automatic changing mechanism by a single step motor. CONSTITUTION:The lower part 132 of a mount guide for supporting a magazine for loading plural reversal films and a mount holder is moved in scanning exposure and reversal film carrying directions along a guide shaft 146 fixed on a lower frame 145. Furthermore, a guiding pin for the mount holder is slided on a guiding groove 132b, etc., formed oblique to the guide shaft 146, so that the mount holder is adjusted so as to be positioned in a focusing direction with reference to the mount guide. Meanwhile, a pinion part formed on a driving gear 141 which is engaged with the gear part of the step motor 143 fixed on the lower frame 145 is engaged with a rack 132a for the lower part 132 of the mount guide. Thus, when the driving gear 141 is rotated by the step motor 143, the mount guide, the mount holder and the magazine are moved in the direction of the guide shaft 146.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide projection device capable of continuously projecting a plurality of slide films, and its mechanism is simplified and downsized.

[0002]

2. Description of the Related Art A slide film is used not only in a slide projector, but also in an image forming apparatus such as a color copying machine or a color printer having a slide projection device. Here, in a slide projection device, generally, an autofocus mechanism that adjusts the position of the slide film with respect to an image forming optical system that forms an image of light that has passed through the slide film and focuses the same, and while transporting the slide film. A scan exposure mechanism for scan exposure is provided.

[0003]

There is also known a slide projection apparatus provided with a so-called auto change mechanism for continuously projecting a plurality of slide films. However, the auto change mechanism is independent of the auto focus mechanism and the scan exposure system, and is not mechanically interlocked. For this reason, the slide projection device equipped with the automatic change mechanism requires two to three drive motors, which increases the size and increases the weight. The present invention has been made in view of the above-described conventional art, and an object of the present invention is to reduce the size and weight of a slide projection device including an automatic change mechanism.

[0004]

Means for Solving the Problems The structure of the present invention which achieves such an object comprises a magazine in which a plurality of slide films are mounted, a scan exposure mechanism for performing scan exposure while conveying the magazine, and the slide film. An imaging optical system that forms an image of the transmitted light, an autofocus mechanism that adjusts the focus position of the slide film with respect to the imaging optical system, and an auto change mechanism that continuously projects by exchanging the plurality of slide films. In the slide projection apparatus including the above, the scan exposure mechanism, the autofocus mechanism, and the autochange mechanism are driven by a single drive motor.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. An embodiment in which the present invention is applied to a color copying machine is shown in FIGS. In this embodiment, an auto change mechanism capable of continuously exposing a plurality of slide films is provided, and one drive motor also serves as a scan exposure mechanism, an auto focus mechanism and an auto change mechanism.

That is, the copying machine main body 4 has an exposure table 3, a carrying roller 6, a heat developing device 7, a paper feeding device 10, a pressure transfer device 11 and the like built therein, and further has a cartridge 2, a paper feeding tray 8 and a paper ejection tray 8. A paper tray 17 is attached. An unexposed photosensitive member 1 is housed in a cartridge 2, and the continuous sheet-shaped photosensitive member 1 pulled out from the cartridge 2 is conveyed onto an exposure table 3 in a copying machine body 4.
The photosensitive member 1 is a photosensitive transfer type heat developing material, and has microcapsules encapsulating a photosensitive substance and a coloring material on a support. A manuscript 20 and a manuscript table 21 are arranged above the exposure table 3, and are irradiated by a three-color exposure lamp (not shown), and the reflected light forms an image on the photosensitive member 1 on the exposure table 3 to form a latent image. It is formed. The photosensitive member 1 on which the latent image is formed is heat-developed by the heat developing device 7 via the conveying roller 6.

A cut sheet-shaped transfer member 9 is housed in the paper feed tray 8, and the transfer member 9 is connected to the paper feed device 10.
Is fed into the copying machine body 4. Then, the transfer member 9 is superposed on the photosensitive member 1 in synchronization with the image region formed on the photosensitive member 1 and transferred under pressure by the pressure transfer device 11. The pressure unit of the pressure transfer device 11 is the upper roller 1
It is composed of three rollers, that is, a middle roller 13, and a lower roller 14, and pressure transfer is performed between the upper roller 12 and the middle roller 13. After that, the transfer member 9 is separated from the photosensitive member 1 by the separation roller 15, is discharged to the paper discharge tray 17 through the conveying roller 16, and the photosensitive member 1 is conveyed by the pinch roller 18 and is wound around the winding shaft 19. ..

Further, a slide projection device 100 according to an embodiment of the present invention is mounted on the copying machine body 4. In the slide projection device 100, the light from the exposure lamp 101 is applied to the slide film 102, the transmitted light is made incident on the projection lens 103, and further reflected by the first mirror 104 and the second mirror 105, so that the main body of the copying machine. It is made to enter the inside of No. 4. The transmitted light that has entered the copying machine main body 4 is reflected by the mirror 5 and irradiated on the photosensitive member 1 on the exposure table 3 to form a latent image on the photosensitive member 1. The photosensitive member 1 on which the latent image is formed is heat-developed by the heat developing device 7 via the conveying roller 6.

FIG. 2 shows a schematic configuration of the slide projection device 100. As shown in the figure, a plurality of slide films 1
The magazine 110 in which 02 is mounted is detachably held by the mount holder 120 via the roller 121, and the mount holder 120 is supported by the mount guide 130 so that the position can be adjusted in the focus direction. Mount guide 130
A rack 133a that meshes with the drive gear 141 is formed on the rack 133, and the magazine 110, mount holder 120, and mount guide 130 are driven in the scan exposure and slide transport directions. In addition, infrared light emitted from the light emitting element 150 is reflected by the slide film 102, and the light receiving element 151
Is imaged at. As a result, autofocus is performed on the projection lens 103 to keep the distance between the slide films 102 constant.

3A and 3B show a side view and a front view of the magazine 110. As shown in FIG.
Holds a plurality of slide films 102 at regular intervals, and not only a standard slide film but also a glass mount film can be used. That is, the magazine plate 111 having a plurality of openings, the magazine cover 1
18 are overlapped and screwed together, and a guide 119 provided with a taper for facilitating insertion into the slide projection device 2 is formed at the tip thereof. The slide film 10 is provided between the magazine plate 111 and the magazine cover 118 to the left and right of the opening shown in FIG.
A pressing lever 115 for positioning 2 in the A direction and a side spring 114 for urging the pressing lever 115 are inserted, and a slide film 102 is provided above and below the opening shown in FIG. Positioning guide 1
16 and a pressing spring 117 for urging the guide 116.
Has been inserted. An upper film guide 112 and a lower film guide 1 are provided above and below the side spring 114 shown in FIG.
13 are arranged. Further, on one side surface of the magazine 110, cutout portions 110a into which the rollers 121 are fitted are continuously formed at regular intervals. The distance between the cutouts 110a is half the distance between the slide films 102.

FIG. 4 shows a front view of the mount holder 120. As shown in the figure, the mount holder 120 fixes the magazine 110 by a frictional force, and the mount guide 1
With respect to 30, the position can be adjusted in the direction perpendicular to the film surface of the slide film 102, that is, in the focus direction. That is, above and below the mount holder plate 124, a mount holder upper 125 and a mount holder lower 126
Are fixed by screws, and two fixed shafts 122 are mounted between the upper surface of the mount holder plate 124 and the upper part 125 of the mount holder, and rollers 121 are mounted on these fixed shafts 122, respectively. .. On the other hand, the lower surface of the mount holder plate 124 and the lower mount holder 126
A support shaft 123 is attached between the and, and an L-shaped lever 127 is pivotally attached to the support shaft 123. This L
A compression spring 128 for urging one end of the L-shaped lever 127 in the clockwise direction indicated by an arrow in the drawing (hereinafter, abbreviated as CW direction) is inserted into the mount holder lower 126 and the L-shaped lever 1
A fulcrum shaft 122 is attached to the other end of 27, and a roller 121 is attached to the fulcrum shaft 122.

Accordingly, the compression spring 128 urges the L-shaped lever 127 in the direction of the arrow in the figure, so that the distance between the three fixed shafts 122 and the rollers 121 is narrowed, and the magazine 110 is crimped between them. It will be fixed by friction force. Furthermore, on the mount holder 12
5, a guide pin 125a is provided on the mount holder 130, and guide pins 126a, 126b are provided on the lower mount holder 126. The guide pins 126a, 126b, 125a are provided on the mount guide 130 with guide grooves 132b, 131a, 13b.
2c, respectively. Guide pins 126a, 126
The mount holder 120 can be positionally adjusted in the focus direction with respect to the mount guide 130 by slanting the b and 125a with respect to the guide grooves 132b, 131a, and 132c.

FIG. 5 shows a front view of the mount guide 130. As shown in the figure, the mount guide 130 supports the magazine 110 and the mount holder 120 so that their positions can be adjusted in the focus direction, and is movable in the longitudinal direction of the magazine 110. That is, the mount guide upper part 131 and the mount guide lower part 132 are fixed by screws on the upper and lower sides of the mount guide plate 133 having an opening in the center, and the rack 1 is mounted on the back side of the mount guide lower part 132.
33a is formed. The mount guide plate 133 is provided with a plate spring 134 that positions the mount holder 120 arranged inside thereof to generate a frictional force and to position the mount holder 120. The guide grooves 132b, 1 are provided in the lower mount guide 132.
32c has a guide groove 131a on the mount guide 131.
Are formed, and these guide grooves 132b, 131a, 13 are formed.
2c, the guide pins 126a, 1 of the mount holder 120
26b and 125a are slidably inserted.

As shown in FIGS. 6 (a) and 6 (b), the lower mount guide 132 is slidably mounted on a guide shaft 146 fixed to the lower frame 145, and the mount guide 130 extends along the guide shaft 146 along arrow C. It is possible to move in the scan exposure and slide conveyance directions indicated by. Further, the guide grooves 132b,
As shown in FIG. 6B, the guide pins 12a and 132c are formed obliquely with respect to the arrow C direction.
6a, 126b, 125a are guide grooves 132b, 131
When the mount holder 120 slides with respect to the mount guide 130, the mount holder 120 slides with respect to FIG.
The position can be adjusted in the focus direction indicated by arrow D in (a). The focus position is set and reset by pressing the mount holder 120 against the lower frame 145 and the contact plate 129. A photo interrupter 147 that detects the position of the mount guide 130 is fixed to the left side of the lower frame 145.

The mount guide 13 is shown in FIGS.
0, a drive mechanism for moving the mount holder 120 and the magazine 110 are shown. As shown in the figure, the lower frame 14
5 includes a drive gear 141 that is rotatable about a drive shaft 142.
Is attached to the lower frame 145 and a step motor 1 which is a drive motor via a motor mounting plate 144.
43 is fixed, and the gear portion of the step motor 143 and the drive gear 141 mesh with each other. A small gear portion is formed on the drive gear 141, and the small gear portion meshes with a rack 132 a formed on the lower mount guide 132. Since the lower mount guide 132 is slidably mounted on the guide shaft 146, the drive gear 141 is driven and rotated by the step motor 143, and the drive gear 141 and the rack 133a are meshed with each other to mount the mount guide 1.
6, the mount holder 120 and the magazine 110 are shown in FIG.
Move in the direction of the middle arrow C.

7 (a) and 7 (b) show the arrangement of the lower frame 145 and the backing plate 129. As shown in FIG. As shown in FIG. 7A, a backing plate 129 is fixed to the left side of the lower frame 145 via a frame 160. This pad 129 is
The focus position is reset when the scan exposure of one screen is completed. That is, when the mount guide 130 and the mount holder 120 are moved leftward in the drawing along the guide shaft 146 and the mount holder upper 125 and the mount holder lower 126 are pressed against the contact plate 129, the guide pins 126a, 126b, 125a are released. Guide groove 132b, 1
Sliding downward in FIG. 6A with respect to 31a and 132c, the focus position is reset. Further, when the mount guide 130 and the mount holder 120 are moved rightward in the drawing along the guide shaft 146, and the mount holder upper 125 and the mount holder lower 126 are pressed against the lower frame 145 by a certain distance, the guide pin 126 is released.
a, 126b, 125a are guide grooves 132b, 131a,
It slid obliquely upward in FIG. 6A with respect to 132c, thereby setting the focus position.

8 and 9 show an autofocus mechanism. As shown in FIG. 8, the light emitting device 150 includes a case 152.
The AF lens 153 is inserted in the front surface of the case and fixed by the C-shaped retaining ring 154, and the infrared light emitting diode 155 is fixed in the rear surface of the case 152. Therefore, the infrared light emitted from the infrared light emitting diode 155 is reflected by the AF lens 1
It passes through 53 and focuses on the surface of the slide film 110. As shown in FIG. 9, the light receiving element 151 includes a case 152.
The AF lens 153 is inserted into the front surface of the case and fixed by the C-shaped retaining ring 154, and the two-divided sensor 15
6 is fixed. Therefore, the infrared light reflected from the surface of the slide film 110 is reflected by the AF lens 153.
The two-divided sensor 156 receives light and focuses.

The slide projection apparatus of the present invention has a configuration as shown in FIG.
An auto change mechanism shown in FIG. 11 is provided. This auto change mechanism is used for multiple slide films 10.
It is used to continuously copy 2. That is, the solenoid 163 is fixed to the side surface of the lower frame 145 via the solenoid mounting plate 162, and the two fulcrum shafts 161 fixed to the solenoid mounting plate 162 are pivotally mounted with the fixing lever 164 and the stopper 165, respectively. ing. A square hole 164a is formed at the tip of the fixed lever 164, and a pin 165a that engages with the square hole 164a is formed in the stopper 165. The plunger of solenoid 163 is fixed lever 16
4 is connected to the pin 4 by pins, while the protrusion 165b of the stopper 165 is connected.
Is engaged with the solenoid mounting plate 162 by a return spring 166. Therefore, as shown in FIG. 10, when the solenoid 163 is not energized, the elastic force of the return spring 166 causes the fixed lever 164 and the stopper 165 to rotate in the counterclockwise direction (hereinafter, abbreviated as CCW direction) and the fixed lever. 1
64 is disengaged from the groove of the magazine 110, and the magazine 110 is free to move.

When the solenoid 163 is energized as shown in FIG. 11, the solenoid 163 resists the elastic force of the return spring.
The plunger retracts, the fixing lever 164 and the stopper 165 rotate in the CW direction, the fixing lever 164 enters the groove of the magazine 110, and the magazine 110 is fixed. When the mount holder 120 and the mount guide 130 are moved along the guide shaft 146 by the engagement of the drive gear 141 and the rack 133a with the magazine 110 fixed in this way, the roller 121 is removed from the notch 110a of the magazine 110. Come off, this roller 121
Will move to the next notch 110a. Although not shown in the figure, a cooling fan is provided in the slide exposure apparatus 100 to prevent a temperature rise due to heat generation of the exposure lamp 101.

FIG. 12 shows a block diagram of a control system for the slide exposure apparatus 100. As shown in the figure, the slide exposure apparatus 100 includes a step motor 14
3, a drive circuit 18 for outputting drive signals M ₀ , S _L , L _P and F _N to the solenoid 163, the exposure lamp 101 and the cooling fan.
0 is provided, and the drive circuit 180 is controlled by the controller 190 provided in the copying machine main body 4. The controller 190 includes a CPU 191 and a storage device 192, and not only performs various controls of the copying machine main body 4 but also
It also controls the slide exposure apparatus 100.
That is, the photo-interrupter 147 with the controller 190, the autofocus signal A _F output from the light receiving element 151 via a sensor amplifier 181 is input
The auto focus reset signal P _S output from is input, and Norma for switching the slide film to the standard slide film or the glass mount film.
The signals S ₁ and S ₂ from the 1 / glass mount changeover switch 193 are input.

[0021] The controller 190, based on the autofocus signal A _F from the light receiving element 151, the drive circuit 1
The step motor 143 is controlled via 80 to adjust the focus position of the slide film 102. However, when using a glass mount film, the focus position in the imaging system is substantially longer than when using a standard slide film, and the light receiving position in the measurement system changes due to refraction of reflected light. Resulting in. Therefore, CPU1
Reference numeral 90 denotes an offset of the focal position of the slide film based on the glass thickness and the refractive index of the glass of the glass mount film stored in the storage device 192 in advance when the changeover switch 193 switches the standard slide film to the glass mount film. The amount is calculated, the offset amount is corrected, the position change of the film surface of the slide film is calculated, and the driving circuit 180 is driven by the calculation result.

An exposure operation in the slide exposure apparatus of the present invention having the above structure will be described with reference to a time chart shown in FIG. 13 and process drawings shown in FIGS.

The state A shown in FIG. 14 is the standby position (home position). This state A is also the start point of autofocus in which the right end of the mount holder 120 is in contact with the side surface of the lower frame 145. Here, when the drive gear 141 is rotated in the CCW direction by outputting the signal M _O to the step motor 143, the mount guide 130 moves in the X (+) direction. Therefore, the guide pins 126a, 126b, 125a of the mount holder 120 are guided by the guide grooves 132b, 131a, 1 of the mount guide 130.
Guided by 32c, it moves diagonally upward in Y (+) and X (-). As a result, the slide film 102 mounted on the magazine 110 moves in the focus direction with respect to the projection lens 103.

At the same time, the light emitted from the light emitting element 150 is reflected by the slide film 102 and received by the light receiving element 151, and the signal _AF is input to the controller 190 to perform autofocus. When the autofocus is switched to the standard slide film or the glass mount film by the changeover switch 193, the focus position is corrected by the above-described offset amount so that the position always has the focus regardless of the type of the slide film. Move the slide film. When the focus is achieved, the rotation of the drive gear 141 is stopped and the state B shown in FIG. 15 is set.

The state B shown in FIG. 15 is the starting point of the scan exposure operation. Here, the signal L _{P is} sent to the exposure lamp 101.
Is output to output the light, the slide film 102 is irradiated with the light, and the transmitted light is projected onto the projection lens 103.
On the other hand, the rotation direction of the drive gear 141 is switched to the CW direction while the mount holder 120 and the mount guide 130 are simultaneously moved in the X (−) direction to start scanning exposure. After that, the position where the designated pulse is sent and one screen is sent is the state C shown in FIG. During the state B to the state C, the signal F _N is output to the cooling fan to assist the heat dissipation of the slide exposure apparatus 100.

The state C shown in FIG. 16 is the scan exposure completion point. Here, when the same screen of the slide film is to be copied a plurality of times, the time chart at the bottom of FIG. 13 is entered, the rotation direction of the drive gear 141 is switched to the CCW direction, and a designated pulse is sent to the state B shown in FIG. The slide is returned, and the scan exposure operation is repeated for the same screen. When copying the next screen of the slide film, in the state C shown in FIG. 16, the exposure lamp 101 is turned off, the drive gear 141 is rotated in the CW direction, and the mount holder 120 and the mount guide 130 are moved in the X (-) direction. To the state D shown in FIG.

State D shown in FIG. 17 is a state in which the autofocus reset operation is performed. In this state, only the mount holder 120 is in contact with the backing plate 129. Here, the drive gear 141 is rotated in the CW direction, and the guide pins 126a, 126b, 125a of the mount holder 120 are connected to the guide grooves 132b, 131a, 1 of the mount guide 130.
32c guides and moves diagonally downward of Y (-) and X (+). Then, when the photo interrupter 147 detects the position of the mount guide 130 and the detection signal P _S is input to the controller 190, the reset operation is completed. The completed position is the state E shown in FIG.

The state E shown in FIG. 18 is the start point of the automatic change. Here, by outputting the signal S _L to the solenoid 162 and retracting the piston, the fixing lever 164 is inserted into the groove of the magazine 110, and the magazine 110
To fix. On the other hand, the rotation direction of the drive gear 141 is CCW
Switching to the direction, the mount guide 130 and the mount holder 120 are returned to the X (+) direction, and the roller 121 is inserted into the next cutout portion 110a of the magazine 110 to obtain the state F shown in FIG.

In the state F shown in FIG. 19, the mount guide 1 is moved by half of the interval at which the slide film 102 is arranged.
It is a state in which 30 and the mount holder 120 are returned in the X (+) direction. Here, the solenoid 162 is released and the fixing lever 164 is removed from the magazine 110 by the elastic force of the return spring 166 to make the magazine 110 movable. Then, the rotation direction of the drive gear 141 is switched to the CW direction, and a designated pulse is sent to the mount holder 12
0, mount guide 130 and magazine 110 X
It is moved in the (-) direction to be in the state G shown in FIG.

The state G shown in FIG. 20 is a state in which the magazine 110 has been fed in the X (-) direction by half the distance at which the slide film 102 is arranged. As shown in the figure, the piston of the solenoid 162 is attracted, so that the fixing lever 164 enters the groove of the magazine 110 and fixes the magazine 110. On the other hand, the rotation direction of the drive gear 141 is switched to the CCW direction, the roller 121 is put in the next cutout portion 110a of the magazine 110, and the state A of FIG. 14 is obtained. State A is
The mount guide 130 and the mount holder 120 are returned in the X (+) direction by the same spacing as the spacing between the slide films 102. The state A is the autofocus start position of the next slide film in the magazine 110.

When the type of slide film is switched by the changeover switch 193 in this way, the controller 1
90 calculates the offset amount of the focus position of the slide film based on the information of the thickness and the light transmittance of the slide film stored in the storage device 192 in advance, corrects the offset amount, and outputs it to the drive circuit 180, Since the distance between the slide film 102 and the projection lens 103 is adjusted,
Not only standard slide film but also special glass mount film such as slide film with different thickness and light transmittance can be used to keep the focus always.

[0032]

As described above in detail with reference to the embodiments, the present invention is a slide projection apparatus equipped with an auto change mechanism, and a scan exposure mechanism, an auto focus mechanism and an auto change mechanism are driven as one unit. Since it is also used as a motor, the device configuration can be simplified and the size, weight and cost can be reduced. Further, if the auto change mechanism is configured to reciprocate a plurality of times to feed one slide film, the apparatus can be made more compact.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a color copying machine according to an embodiment of the present invention.

FIG. 2 is a front sectional view of a slide projection device of the present invention.

FIG. 3A is a side view of the magazine, and FIG.
FIG. 7 is a front view showing a magazine with a part thereof broken away.

FIG. 4 is a front view showing a mount holder.

FIG. 5 is a front view showing a mount guide.

6A and 6B are a sectional view and a configuration diagram showing a drive system of a mount guide.

7 (a) and 7 (b) are a plan view and a cross-sectional view showing the arrangement of a backing plate.

FIG. 8 is a cross-sectional view showing a light emitting element.

FIG. 9 is a cross-sectional view showing a light receiving element.

FIG. 10 is a rear cross-sectional view of the auto change mechanism, showing a state in which a solenoid is energized.

FIG. 11 is a rear cross-sectional view of the auto change mechanism, showing a state in which the solenoid is not energized.

FIG. 12 is a block diagram of a control system of the slide projection device.

FIG. 13 is a time chart of the slide projection device.

FIG. 14 is a process diagram showing the start of autofocus.

FIG. 15 is a process diagram showing the start of scan exposure.

FIG. 16 is a process diagram showing the completion of scan exposure.

FIG. 17 is a process diagram showing an autofocus reset operation.

FIG. 18 is a process diagram showing the start of auto change.

FIG. 19 is a process diagram showing a state during the automatic change.

FIG. 20 is a process diagram showing a state during the automatic change.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photosensitive member 2 Cartridge 3 Exposure table 4 Copier main body 5 Mirror 6 Conveying roller 7 Thermal developing device 8 Paper feed tray 9 Transfer member 10 Paper feeding device 11 Pressure transfer device 12 Upper roller 13 Middle roller 14 Lower roller 15 Separation roller 16 Conveying Roller 17 Paper output tray 18 Pinch roller 19 Rewinding shaft 20 Original plate 21 Original 100 Slide projection device 101 Exposure lamp 102 Slide film 103 Projection lens 104 First mirror 105 Second mirror 110 Magazine 111 Magazine plate 112 Upper film guide 113 Lower film Guide 114 Side leaf spring 115 Holding lever 116 Guide 117 Holding spring 118 Magazine cover 119 Tip guide 120 Mount holder 121 Roller 122 Fixed shaft 123 Support shaft 124 Mount ho Da plate 125 Mount holder upper 125a Guide pin 126 Mount holder lower 126a, 126b Guide pin 127 L-shaped lever 128 Compression spring 129 Abutment plate 130 Mount guide 131 Mount guide upper 131a Guide groove 132 Mount guide lower 132a Rack 132b, 132c Guide groove 133 mount guide plate 134 leaf spring 141 drive gear 142 drive shaft 143 step motor 144 motor mounting plate 145 lower frame 146 guide shaft 147 photointerrupter 150 light emitting element 151 light receiving element 152 case 153 AF lens 154 C-shaped snap ring 155 infrared light emitting diode 156 2-split sensor 160 Frame 161 Support shaft 162 Solenoid mounting plate 163 Solenoid 164 Fixed lever 165 Stopper 166 Return Spring 180 Drive circuit 181 Sensor amplifier 190 Controller 191 CPU 192 Storage device 193 Changeover switch CW Clockwise CCW Counterclockwise

Claims (1)

[Claims] 1. A magazine in which a plurality of slide films are mounted, a scan exposure mechanism for performing scan exposure while transporting the magazine, an image forming optical system for forming an image of light transmitted through the slide film, and the connection unit. In a slide projection device including an autofocus mechanism for adjusting a focus position of the slide film with respect to an image optical system and an autochange mechanism for continuously projecting by exchanging the plurality of slide films, a scan exposure mechanism,
A slide projection device characterized in that an autofocus mechanism and an autochange mechanism are driven by a single drive motor.