JPH0822071A - Film appreciating device - Google Patents

Abstract

PURPOSE:To prevent undeveloped film cartridge from being inadvertently exposed when a film cartridge for housing photographing film in which developed film is housed is used for a film appreciating device. CONSTITUTION:A cartridge chamber 141 covering the film cartridge 106 loaded and a spool chamber 142 covering a film winding take-up spool 112 are formed at a slide projector 100, and a light shielding shutter covering a screen frame part is provided, and film 120 is held in hermetically sealed space in a light- shielded state. The exposing state display of the film cartridge 106 is detected, and the light-shielding shutter 143 is opened only in the case of the developed film so that the image of the film 120 is projected by a light source lamp 114.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film appreciation device, and more particularly to a film appreciation device that enables viewing of an image of a film stored in a film cartridge with a built-in light shielding door with a film status display.

[0002]

2. Description of the Related Art Generally, a photographic film is often developed and then stored in a slide frame one frame at a time, or cut into several frames and stored in a sheet-shaped dedicated holder. If the film is stored again in the film cartridge for shooting and the display of "developed" is given, it is considered to be convenient for handling for viewing and storage. In order to view the film stored in the film cartridge in this way, it is conceivable to use a film viewing apparatus such as an optical projection apparatus, a TV viewing apparatus, or an image printer, which has the same structure as the conventional one.

For such an application, a cartridge with a film state display for displaying the state of the film contained in the film cartridge, that is, developed, photographed (undeveloped), unused (not photographed), etc. is used. And convenient. Such a film cartridge is provided with a display disc that rotates integrally with a film winding cartridge spool shaft housed in the film cartridge, and the position of a display mark formed on the display disc can be recognized from the outside of the film cartridge. Is configured. Then, by stopping the cartridge spool shaft at a predetermined position (rotation angle) according to the exposure state, the display mark of the display disc is displayed at a predetermined position,
The film status is displayed.

The film cartridge with a film status display can be used in a film viewing apparatus having the same structure as the conventional one. However, since the conventional film viewing apparatus is premised on the use of the developed film, the light shielding of the film is not taken into consideration, and a high brightness light source is generally used. Therefore, in a film viewing apparatus configured in the same manner as the conventional one, if a film cartridge containing an undeveloped film is accidentally loaded instead of a film cartridge containing a developed film, the film cartridge is not developed. Film is sent out and the film may be exposed.

In order to prevent such exposure, when the film cartridge is loaded, first, an indication of the film state is detected, and if the detected indication is not the developed indication of the film, the film is sent out from the film cartridge. The film viewing device may be configured so that it does not exist.

However, there is a light-shielding door for keeping the inside of the film cartridge in a light-shielding state at the entrance and exit of the film, and the display of the film state cannot be detected unless the light-shielding door is opened. In the attached film cartridge, the undeveloped film in the film cartridge may be exposed when the film state is detected before the film is fed. For example, when the light shielding door is closed, the rotation of the cartridge spool shaft is locked, but in order to detect the display of the film display state, the light shielding door must be opened to rotate the cartridge spool shaft.

[0007]

SUMMARY OF THE INVENTION Therefore, the technical problem to be solved by the present invention is to use a film cartridge with a built-in light-shielding door, which cannot detect the display of the film-status display means unless the light-shielding door is opened. In a film viewing apparatus according to the present invention, even if a film cartridge accommodating an undeveloped film is accidentally loaded, the film viewing loading does not expose the film.

[0008]

In order to solve the above technical problems, the present invention provides a film viewing apparatus having the following structure.

That is, this film viewing apparatus is loaded with a film cartridge with a built-in light shielding door with a film status display, which has a film status display means for displaying at least developed / undeveloped film, and the film stored in the film cartridge. Is a device that allows you to view the image recorded on the film for viewing. The film status display means includes a film status display disc formed at one end of a cartridge spool shaft that rotates with the film and having a film status display mark.

This apparatus comprises a film cartridge storage space, a film feeding means, a film state detecting means,
And control means.

The film cartridge accommodating space has a light-shielding member that can be opened and closed, and at least when the film cartridge is loaded, the light-shielding member is closed to form a substantially hermetically sealed space in which the interior is shielded from light. The film cartridge storage space is formed, for example, as a cartridge chamber in which a film cartridge is stored,
A light blocking member is arranged at the film exit. Alternatively,
The film cartridge storage space, including the take-up spool that winds the film from the film cartridge,
The light shielding member may be formed so as to cover the entire space where the film sent out from the film cartridge exists, and the light shielding member may be disposed in the screen frame portion at the frame position of the film to be viewed.

The film feeding means feeds and rewinds the film of the film cartridge housed in the film cartridge housing space.

As a concrete constitution of the film state detecting means, for example, the film state indicating mark of the film state indicating disc is provided so as to face the display of the film state indicating means of the film cartridge loaded in the film cartridge storing space. It includes a detection sensor capable of detecting.

When the film cartridge is loaded in the film cartridge housing space, the control means controls the film feeding means to execute the film rewinding operation of the film cartridge. At this time, the film state detection means detects the film state display mark of the film state display means of the film cartridge to control the display of the film state display means of the film cartridge at the beginning of loading. Then, when the detected display at the beginning of the filling has been developed, the film feeding means executes the feeding of the film of the film cartridge and the light shielding member in the film cartridge housing space is controlled to open.

In the above structure, when the film cartridge is loaded, the rewinding operation of the film detects the display of the film state at the beginning of loading. At this time,
The light-shielding door of the film cartridge is opened to detect the film state, but since the film cartridge is loaded in the light-shielded film cartridge housing space in which the light-shielding member is closed, the film in the film cartridge is not exposed. Further, since the film rewinding operation is executed, the film is not sent out from the film cartridge. Therefore, even if the display of the film state is undeveloped, the operation of rewinding the fed-out film into the film cartridge is not necessary, and a quick operation is possible.

In the display of the film state display means, the position of the film state display mark changes when the cartridge spool shaft is rotated by rewinding the film by a predetermined amount corresponding to the display. At a predetermined position of the film cartridge, the rotation angle of the cartridge spool until the film status display mark changes and the display of the film status display means changes to a constant value corresponding to the initial display of the film status. Therefore, the display of the film state when the film cartridge is initially loaded can be detected from the change of the display and the rewinding operation amount.

When it is detected that the display at the beginning of loading is the developed film display, the film is sent out from the film cartridge, the light blocking member in the film cartridge storage space is opened, the light blocking state is released, and the film is released. Can be viewed. On the other hand, if the indication that the film has not been developed is detected, the light-shielding state of the film cartridge is maintained, and preferably an appropriate alarm is issued.

Therefore, according to the above construction, in the film appreciation apparatus in which the film cartridge with the built-in light shielding door with the film status display, in which the display of the film status display means cannot be detected unless the light shielding door is opened, the undeveloped film is stored If a loaded film cartridge is accidentally loaded, it will not expose the film.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A film viewing apparatus according to an embodiment of the present invention shown in FIGS. 1 to 12 will be described in detail below. Here, the slide projector 100 will be described as an example of the film viewing apparatus.

First, the outline of the configuration of the slide projector 100 will be described.

The slide projector 100 is shown in FIGS.
The film cartridge 106 has an appearance as shown in FIG.
It is a device that pulls out a film from the inside, enlarges an image recorded on the film with a projection lens 104, and projects it on a screen (not shown). As shown in FIG. 2, the lid 102 is opened and the film cartridge 106 is loaded therein.
When the lid 102 is closed as shown in FIG. 1, if the film has been developed, the film in the film cartridge 106 is sent out along the guide portion 108 and an image is displayed.

The internal structure of the slide projector 100 is constructed as shown in FIG. That is, in the main body of the slide projector 100, the cartridge loading unit 103 in which the film cartridge 106 is loaded.
And a film guide portion 108 adjacent thereto. The film guide unit 108 is used for the film cartridge 1
It is for guiding the film 120 sent from 06. A take-up spool 112 for taking up the film 120 at a position facing the film guide portion 108.
Is provided. Screen frames 110a and 110b are provided between the film guide unit 108 and the take-up spool 112 to guide the film 120 and form a frame of a projected image. The reflector 116, the light source lamp 114, and the condenser lens 118 are arranged on one side of the film 120 perpendicularly and concentrically to the surface of the film 120 between the screen frames 110a and 110b, and the other side is a projection lens. 104 is arranged. The slide projector 100 further includes a film cartridge storage space (not shown), which will be described later.

The film drive system, which is a film feeding means for winding / rewinding the film 120 stored in the film cartridge 106, is constructed as shown in FIG. That is, the film cartridge 106
The cartridge spool 105 of the fork drive mechanism 13
The take-up spool 112 is driven by the spool drive mechanism 139 while being driven by the spool drive mechanism 139. The fork drive mechanism 13 is attached to the engaging portion 105a formed at the shaft end of the cartridge spool 105 of the film cartridge 106.
The engaging fork 134 formed at one end of the fork shaft 11 transmitting the rotation from 2 engages and transmits the rotation to the cartridge spool 105. On the other hand, a spool drive mechanism 139 is directly connected to the take-up spool 112 and transmits rotation.

The fork drive mechanism 132 and the spool drive mechanism 139 are driven by the film drive mechanism 124 whose operations are controlled by the control circuit 148. The film drive mechanism 124 includes a cartridge-side output gear 126 that transmits rotation to the fork drive mechanism 132 and a spool-side output gear 136 that transmits drive force to the spool drive mechanism 139.
Have and.

Two planetary gears 127 and 128 are constantly meshed with the cartridge-side output gear 126. Both planetary gears 127 and 128 are held by a substantially V-shaped carrier 162, and integrally rotate about the shaft center of the cartridge-side output gear 126 while maintaining a relative positional relationship.

A fork drive gear 130 for transmitting the rotation to the fork drive mechanism 132 is arranged between the two planet gears 127, 128, and the planet gears 127, 128 are integrally rotated to rotate which of the planet gears 127, 128. It also meshes with 128. Depending on which planet gear 127, 128 is engaged, the fork drive gear 130 rotates in the forward or reverse direction, as will be described later.

On the other hand, the spool-side output gear 136 is constantly meshed with the winding drive planetary gear 137 held by the substantially I-shaped carrier 172. Winding drive planetary gear 13
7 rotates about the axis of the spool-side output gear 136. When the winding drive planetary gear 137 rotates and meshes with the spool drive gear 138, the spool drive gear 138 rotates forward.

Positioning holes 122 are formed in the film 120 accommodated in the film cartridge 106 so as to correspond to the respective frames 121. The screen frame portion has a photo reflector 144 that photoelectrically detects the positioning hole 122.
Is provided. Further, a magnetic head 146 is provided in the screen frame portion in order to read data of a magnetic recording portion (not shown) formed on the film 120 corresponding to each frame 121 of the film 120. The photo-reflector 144 and the magnetic head 146 are connected to a control circuit 148 in order to control film feeding by the signals obtained from them.

Next, the film feeding / rewinding operation of the slide projector 100 will be described with reference to FIG.

That is, when the film cartridge 106 is loaded in the slide projector 100, the control circuit 148, which is a control means, issues a forward rotation command to the film drive mechanism 124.

The cartridge side output gear 126 of the film drive mechanism 124 is rotated counterclockwise in the figure by this command. Carrier 1 that holds both planetary gears 127 and 128 that mesh with the cartridge-side output gear 126
By frictional contact with the cartridge-side output gear 126, the reference numeral 62 rotates counterclockwise about the shaft of the cartridge-side output gear 126 in the figure, and the feed drive planetary gear 127 meshes with the fork drive gear 130. Then, by this engagement, the film cartridge 106 is passed through the engaging fork 134 of the fork drive mechanism 132.
Cartridge spool 105 is rotated and film 1
20 is pushed out of the film cartridge 106. The extruded film 120 has a film guiding portion 1
08 and the screen frames 110a and 110b to reach the take-up spool 112.

On the other hand, the spool-side output gear 136 of the film drive mechanism 124 rotates clockwise in the drawing in response to a forward rotation command from the control circuit 148. This allows
Carrier 17 in frictional contact with spool-side output gear 136
Reference numeral 2 rotates clockwise in the drawing, and the winding drive planetary gear 137 that meshes with the spool-side output gear 136 meshes with the spool drive gear 138. By this engagement,
The rotation is transmitted to the spool drive mechanism 139, and the take-up spool 112 rotates in the direction in which the film 120 is taken up.

Then, the film 120 sent out by the fork drive mechanism 124 is taken up by the take-up spool 112.
Is reached, it is taken up by the rotating take-up spool shaft 112.

When the control circuit 148 detects the positioning hole 122 corresponding to the predetermined frame 121 of the film 120 with the photo reflector 144, it issues a stop command to the film drive mechanism 124 to move the predetermined frame 121 of the film 120 to the screen frame portion. Stop in place. To detect the predetermined frame 121, the magnetic recording portion of the film 120 is detected by the magnetic head 146.
Read by reading.

Light from the light source lamp 114 is transmitted through a predetermined frame 121 of the positioned film 120, and the image of the frame 121 is enlarged and projected on a screen (not shown) by the projection lens 104.

When the viewing is completed, the control circuit 148 issues a reverse rotation command to the film drive mechanism 124.

According to this command, the spool side output gear 136 of the film drive mechanism 124 rotates counterclockwise in the figure, and the carrier 172 contacting the spool side output gear 136 rotates counterclockwise. Therefore, the engagement between the take-up drive planetary gear 137 and the spool drive gear 139 is released.

On the other hand, the cartridge-side output gear 126 of the film drive mechanism 124 rotates clockwise in the figure, whereby the carrier 162 rotates clockwise around the axis of the cartridge-side output gear 126, and the feed-drive planet. The meshing between the gear 127 and the fork drive gear 130 is released, and then the rewinding drive planetary gear 128 meshes with the fork drive gear 130. Due to this engagement, the engagement fork 134 rotates in the direction opposite to that at the time of feeding the film, and rewinds the film 120 into the film cartridge 106.

Next, the film cartridge 106 used in the slide projector 100 will be described with reference to FIGS.
Will be described with reference to.

That is, the film cartridge to be used is the film cartridge 106 with a built-in light-shielding door and a film status display means. Film cartridge 106
As shown in FIG. 8, includes a main body outer wall portion and a light shielding door 31, and accommodates the film 120 inside. When the light shielding door 31 is closed, the inside of the film cartridge 106 becomes a closed space in a light shielding state. Film cartridge 106
The cartridge spool 10 as shown in FIG.
5 is provided. The cartridge spool 105 is the cartridge spool shaft 10 on which the film 120 is wound.
A pair of upper and lower circular discs 105f and 105g are provided on both ends of 5d.
Are integrally formed.

On the upper surface of the upper disc 105f of the cartridge spool 105, a film state display mark 105b is formed.
(Indicated by diagonal lines) are formed. On the other hand, on the upper surface 106a of the film cartridge 106, as shown in FIG.
Three display windows 107a, 107b, 107c are provided every 0 degree. Then, depending on which position of the display windows 107a, 107b, 107c the film status display mark 105b of the cartridge spool 105 is positioned, the exposure status of the film 120 stored in the cartridge 106 is developed, photographed or not. It is displayed that it is developed) and unused (unexposed). When the light shielding door 31 is closed, the rotation of the cartridge spool 105 is locked so that the display of the exposure state cannot be switched.

On the lower surface of the lower disk 105g of the cartridge spool 105, as shown in FIG. 8 (II), a bar code disk 173 exposed on the lower surface 106b of the film cartridge 106 is formed. This barcode disc 17
A bar code 3 in which film information, that is, information such as the number of frames of the film 120 and the type (negative or positive) of the film 120 is recorded is formed at 3. The slide projector 100 includes a photo reflector,
This bar code information can be read.

In the film cartridge, instead of the above structure, a film state indicating mark 105b is formed on the outer peripheral surface of the upper disk 105f, and correspondingly, the display windows 107a, 107b, 10 are formed on the outer peripheral surface of the film cartridge 106.
It is also possible to form 7c.

The slide projector 100 has a film cartridge storage space in addition to the configuration shown in FIG.

That is, as shown in FIG. 5, the cartridge chamber 14 for covering the loaded film cartridge 106.
1, and a spool chamber 142 that covers the take-up spool 112.
The film cartridge storage space is formed by including the light-shielding shutter 143 that is a light-shielding member that covers the screen frame portion so as to open and close.

With such a structure, the film 120 of the film cartridge 106 is held in the light-shielded closed space. Therefore, unless the light-shielding shutter 143 is opened, even if the undeveloped film cartridge 106 is mistakenly loaded into the slide projector 100 and the film 120 is sent out from the film cartridge 106, the film 120 is accidentally exposed. Does not happen.

The light shielding shutter 143 is supported by a link mechanism so as to be movable up and down. That is, as shown in FIG. 6, one end of the light-shielding shutter 143 covering the screen frame 110 is pivotally supported by the other ends of the pair of levers 150, 152, one end of which is pivotally supported by the fixed shafts 150a, 152a. It

Shutter drive lever 1 which is one lever
Reference numeral 52 is divided into a fork of a shutter support arm 152b that pivotally supports the light-shielding shutter 143 and a shutter drive arm 152c, and the joining portion is pivotally supported by a fixed shaft 152a. A spring 153 is attached to the tip of the shutter drive arm 152c, and the spring return force constantly urges the shutter drive lever 152 in the direction of closing the shutter (clockwise in the figure). A stopper 154 is provided below the shutter support arm 152b to regulate the position of the shutter support arm 152b, and the light blocking shutter 143 holds the closed position.

The light-shielding shutter 143 has a tip end portion 152e of the shutter drive arm 152c of the shutter drive lever 152.
However, the planetary gears 127 and 128 of the fork drive mechanism 132 are
The shutter drive lever 152 is rotated in the counterclockwise direction indicated by the solid arrow in the figure by being pushed by the movement (rightward movement in the figure) of the shutter drive protrusion 162a formed at the tip of the carrier 162 that holds the Opened by. By this rotation, the shutter drive lever 152
Locking groove 152d formed in the vicinity of the fixed shaft 152a of
One end 155b of the shutter locking lever 155, which is biased toward the shutter drive lever 152 side by the spring 156, is locked and the shutter open state is maintained.

The locking lever 155 has its substantial center pivotally supported by the fixed shaft 155a and the other end 155 facing the one end 155b.
A spring 156 is attached to c, and a locking lever 155 is attached.
One end 155b of the locking groove 1 of the shutter drive lever 152
52d is always energized. A plunger 157 is attached to one end 155b of the locking lever 155.

When the plunger 157 is energized, the shutter 143 returns to the closed state. That is, when the plunger 157 is energized, the locking lever 155 rotates clockwise in the figure against the spring return force of the spring 156, and the one end 155b of the locking lever 155 and the shutter drive lever 152 are locked. The engagement with the groove 152d is released. As a result, the shutter drive lever 152 is rotated clockwise in the figure by the spring return force of the spring 153, the shutter drive arm 152a hits the stopper 154, and the light shielding shutter 143 returns to the closed state.

The light-shielding shutter 143 opens in conjunction with the above-mentioned film drive system. Here, the film drive system will be described with reference to FIG. 7, which is shown in more detail by horizontally reversing FIG.

That is, the film driving mechanism 124 transmits the rotation output of the film feeding motor 50 to the cartridge side output gear 126 which is a sun gear through the reduction gear system 51. When the cartridge-side output gear 126 is rotated clockwise in the drawing when the film 120 is fed, the carrier 162 holding the pair of planet gears 127 and 128 rotates in the rotation direction of the cartridge-side output gear 126, that is, the clockwise direction. To be done.

A fixed internal gear 163 that meshes with the planetary gear 127 is provided on the orbit of one of the feeding drive planetary gears 127. In accordance with the meshing position between the fixed internal gear 163 and the feed drive planetary gear 127,
The shutter drive protrusion 162a at the tip of the carrier 162 and the shutter drive arm 152 of the shutter drive lever 152
It is arranged so that the tip end portion 152e of c contacts.

As the output gear 126 on the cartridge side rotates, the carrier 162 rotates clockwise in the figure, and when the feed drive planetary gear 127 meshes with the fixed internal gear 163, the output gear 126 on the cartridge side rotates to feed it. The center of the drive planetary gear 127 is forcibly moved clockwise. Therefore, the carrier 162 that fixes the planetary gear 127 is the cartridge-side output gear 1
It is forcibly rotated with the rotation of 26. At this time, since the shutter drive protrusion 162a of the carrier 162 contacts the tip end portion 152e of the shutter drive arm 152c to rotate the shutter drive lever 152, the light blocking shutter 143 opens as described above.

When rewinding the film 120, conversely,
The cartridge-side output gear 126 rotates counterclockwise in the figure, and the carrier 162 rotates counterclockwise accordingly. At this time, if the light-shielding shutter 143 is open, the tip end portion 152e of the shutter drive arm 152c is retracted, so that the carrier 162 rotates without any obstacle. Then, the rewinding drive planetary gear 128 meshes with the fork drive gear 130, and the film 120 is rewound.

As shown in FIG. 7, the film drive system is further configured as follows.

That is, the switch pattern substrate is integrated with the fork shaft gear 165 provided at the other end of the fork shaft 11 having the engaging fork 134 at the shaft end.
The reference phase of the fork shaft 11 can be detected by the detection switch 166 composed of the opposite switch segments 166a and 166b. That is, the switch segment 166
If both a and 166b are on the conductive pattern 169, the detection switch 166 is conductive. Also, a photo reflector 16 for reading the barcode information of the barcode disc exposed on the lower surface 106b of the film cartridge 106.
7 is provided. Further, the output shaft of the film feeding motor 50 is provided with a pulse encoder plate 1 as a pulse encoder.
60 and a photo interrupter 161 are provided, and the phase of the fork shaft 11 can be discriminated by using the pulse signal generated thereby. Details will be described later.

The electric circuit block diagram is constructed as shown in FIG.

That is, the microcomputer 180 included in the control circuit 148 has a detection switch 166 for detecting the phase of the fork shaft 11, a photo reflector 140 for reading the exposure state of the film, and a bar code for reading the cartridge. Photo reflector 167
Connected to a photo interrupter 161 for detecting the amount of rotation of the output shaft of the film feeding motor 50, a photo reflector 144 for detecting the frame position, and a magnetic head 146 for reading the data of the magnetic recording unit, Signals are input from them. On the other hand, microcomputer 1
80 is the film feed motor 50 and the plunger 157.
It is connected to and outputs an operation command signal to them.

Next, the operation sequence of the slide projector 100 will be described with reference to the flowchart of FIG.

That is, in order to load the cartridge 106, first, the lid 102 of the cartridge chamber 103 is opened. At this time, the light shielding shutter 143 is closed, and the fork drive system is in the rewinding completed state. The cartridge 102 is loaded, and the lid 102 of the cartridge chamber 103 is loaded.
When is closed, the cartridge 106 is in a light shielding state. At this time, a mechanism that interlocks with the lid 102 of the cartridge chamber 103
The light blocking door 31 of the film cartridge 106 is opened by (not shown). This mechanism is used in the cartridge chamber 1
If the lid 103 of 03 is operated after the lid 102 is completely closed, there is no problem in light shielding.

Next, the fork shaft 11 is driven in the rewinding direction to determine the exposure state. Details of the exposure state determination method will be described later. When it is determined that the exposure state is undeveloped, a warning is displayed and the removal of the cartridge 106 is awaited. When it is determined that the development has been completed, the barcode information of the barcode disc 173 read at the same time as the determination of the exposure state is interpreted. If it is determined from this information that the film is a negative film, a normal image cannot be projected on the slide projector, and a warning is displayed. It should be noted that in a device that converts and displays an electronic image, negative / positive may be automatically switched.

Next, the fork shaft 11 is driven in the film feeding direction, the film 120 is fed from the film cartridge 106 and wound on the take-up spool 112, and the predetermined frame 121 is stopped at the screen frame portion. At this time, the carrier 162 that holds the planet gears 127 and 128
Is moved to open the light shielding shutter 143 as described above. Then, the light source lamp 114 is turned on, and the film 12
A predetermined frame 121 of 0 is projected.

After the projection is completed, the light source lamp 114 is turned off,
The film 120 is wound into the film cartridge 106, and the rotation of the fork shaft 11 is stopped at the position where the exposure state display of the film cartridge 106 indicates “developed”.

Next, the plunger 157 is energized to close the light shielding shutter 143.

Finally, in conjunction with the take-out operation of the film cartridge 106, the light shielding door 31 of the cartridge 106 is first closed, and then the lid 102 of the cartridge chamber 103 is closed.
To remove the film cartridge 106.

The above is a series of operation sequences. When a drive source other than the film feeding motor 50 (for example, a dedicated shutter drive motor) is used to open and close the light-shielding shutter 143, in the operation sequence,
When the light-blocking shutter 143 is opened / closed, the light-blocking shutter 143 may be moved by its drive source.

The film exposure state is detected by the film state detection means. For example, it can be performed by reading the exposure state display with a photo reflector which is a detection sensor arranged so as to face the display window on the upper surface 106a of the film cartridge 106.

For example, the film state detecting means can determine not only whether it has been exposed but also whether it is a photographed display or an unused display simply by providing the photo reflector 140 in one display window 107b. The configuration is

That is, by using the phase detection switch 166 of the fork shaft 11, when the film cartridge 106 is not loaded, as shown in FIG. 12, the key 134a of the engaging fork 134 at the end of the fork shaft 11 is always in a predetermined phase. Thus, the rotation of the fork shaft 11 is restricted. At this time, even if the film cartridge 106 is loaded, the engaging portion 105 of the spool 105 of the film cartridge 106
The key groove of a and the engaging fork 134 at the end of the fork shaft 11
The key 134a is in a retracted state that cannot be engaged as it is.

From this retracted state, the fork shaft 11 is rotated, the key 134a and the key groove are aligned, the engaging fork 134 is engaged with the engaging portion 105a of the spool 105 of the film cartridge 106, and the fork shaft 11 is further rotated. The rotation angle until the display of the exposure state display window 107b of the film cartridge 106 is switched by rotating the film, the pulse encoder 1 provided on the output shaft of the film feeding motor 50.
It is detected at 60 and 161. The exposure state of the film cartridge is determined by comparing the detected rotation angle with a reference value.

For example, in the example shown in FIG. 12, in the retracted state, the fork shaft 11 moves toward the film cartridge 1
Cartridge spool 10 in the developed display of 06
The engaging portion 105a of No. 5 is out of phase by 90 degrees in the film winding direction. That is, when the fork shaft 11 rotates 90 degrees in the film winding direction (270 degrees in the film feeding direction), the engaging portion 105a of the spool 105 of the film cartridge 106 in the developed state is displayed.
The engaging fork 134 of the fork shaft 11 is engaged with.

In this example, the film cartridge 1
When 06 is loaded, the fork shaft 11 rotates in the film rewinding direction to detect the exposure state. In response to the display of the exposure state, the fork shaft 11 moves at a predetermined angle A (90
(180 °, 270 °), the engaging fork 134 at the end of the fork shaft 11 will move to the cartridge spool 1.
The engaging part 105a of No. 05 is engaged.

After the engagement, the fork shaft 11 is further moved by a predetermined angle B (45 °, 45 °, 225) corresponding to the exposure display state.
When the film is rewound in the film rewinding direction, the cartridge spool 105 rotates and the photographed display window 107b
Display is reversed from white to black or from black to white.

Fork shaft 11 until such display reversal
All angles of film rewinding direction are detected and all angles A + B (135 °, 225 °, 4
By comparing with a reference value of 95 °), it is possible to determine which exposure display state is in which display state.

Since the reference values of all the angles A + B are widely separated for each exposure state display, the pulse encoders 160, 161 provided on the output shaft of the film feeding motor 50 due to the rotation deviation of the carrier 162 or the like. Even if the detection value of the rotation angle from the value slightly varies with respect to the actual rotation angle of the fork shaft 11, the exposure state display can be accurately determined. As described above, the film state detecting means having the structure using the film state display disc can detect the state of the film with high accuracy and does not make an erroneous determination.

The present invention is not limited to the above embodiment, but can be implemented in various other modes. For example, the detection of the exposure state of the film cartridge 106 may be determined by reading the barcode disk 173 of the film cartridge 106 with the photo reflector 167 for barcode. In this method, the bar code disc 173 formed on the cartridge spool 105 and the film status indication mark 105b rotate integrally while maintaining a constant phase relationship with the cartridge spool, similarly to the detection of the above-mentioned exposure state display. This is what you do. With this method, the photoreflector 140 for determining the exposure state can be eliminated, and there are effects such as simplification of the configuration and cost reduction. Further, the above configuration and sequence can be easily applied to the case of a TV viewing device that reads a film image by an image sensor and electrically displays it.

[Brief description of drawings]

FIG. 1 is a perspective view of a slide projector according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a cartridge of the slide projector of FIG. 1 is opened and a cartridge is loaded.

FIG. 3 is an optical configuration diagram of the slide projector of FIG. The light blocking means is not shown.

4 is a film drive system configuration diagram of the slide projector of FIG. 1. FIG.

5 is an optical configuration diagram of the slide projector of FIG.

FIG. 6 is a structural diagram of a light-shielding shutter.

FIG. 7 is a drive mechanism configuration diagram of a film and a light-shielding shutter.

FIG. 8 is a perspective view of a film cartridge. (I)
Shows the upper surface and (II) shows the lower surface.

FIG. 9 is a perspective view of a spool housed in the film cartridge of FIG.

10 is a block diagram of an electric circuit of the slide projector shown in FIG.

11 is an operation flowchart of the slide projector of FIG.

FIG. 12 is an explanatory diagram of a method of discriminating the exposure state display of the film cartridge.

[Explanation of symbols]

11 Fork Shaft 31 Shading Door 50 Film Feed Motor 51 Speed Reduction System 100 Slide Projector (Film Viewing Device) 102 Lid 103 Cartridge Loading Section 104 Projection Lens 105 Cartridge Spool 105a Engagement Section (Film Status Display Means) 105b Film Status Display Mark 105d Cartridge spool shaft 105f Upper disk (film status display disk) 105g Lower disk 106 Film cartridge 106a Upper surface 106b Lower surface 107a, 107b, 107c Display window (film status display means) 108 Film guide 110 Screen frame 110a, 110b Screen frame 112 Winding Spool 114 Light source lamp 116 Reflector 118 Condenser lens 120 Film 121 Frame 122 Positioning hole 124 Film drive mechanism (film Feeding means) 126 Cartridge side output gear 127 Feeding drive planetary gear 128 Rewinding drive planetary gear 130 Fork drive gear 132 Fork drive mechanism (film feeding means) 134 Engaging fork 134a Key 136 Spool side output gear 137 Winding drive planetary gear 138 Spool drive gear 139 Spool drive mechanism (film feeding means) 140 Photoreflector (film state detection means) 141 Cartridge chamber (film cartridge storage space) 142 Spool chamber (film cartridge storage space) 143 Light-shielding shutter (light-shielding means) 144 Photo Reflector 146 Magnetic head 148 Control circuit (control means) 150 Shutter support lever 150a Fixed shaft 152 Shutter drive lever 152a Fixed shaft 152b Shutter support arm 52c Shutter drive arm 152d Locking groove 152e Tip part 153 Energizing spring 154 Stopper 155 Shutter locking lever 155a Fixed shaft 155b One end 155c Other end 156 Energizing spring 157 Plunger 160 Pulse encoder plate (film state detecting means) 161 Photo interrupter ( Film state detection means) 162 carrier 162a Shutter drive protrusion 163 Fixed internal gear 165 Fork shaft gear 166 Detection switch (film state detection means) 166a, 166b Switch segment 167 Photoreflector 169 Conductive pattern 170 Film cartridge 172 Carrier 173 Bar code circle Board 180 Microcomputer (control means)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuhiko Kojima 2-3-3 Azuchi-cho, Chuo-ku, Osaka-shi, Osaka, Osaka International Building Minolta Camera Co., Ltd. (72) Yoshio Nakagawa Azuchi, Chuo-ku, Osaka-shi, Osaka 2-3-3 Machi Osaka International Building Minolta Camera Co., Ltd.

Claims (1)

[Claims] 1. A film status display means (105b, 1) for displaying at least developed / undeveloped of the film (120).
05f, 107a, 107b, 107c) with a built-in light-shielding door-equipped film cartridge (106), and the film (120) stored in the film cartridge (106) is pulled out to the outside.
A film viewing apparatus (100) for displaying an image recorded in (120) for viewing, comprising film status display means (105b, 105f, 107a, 107b, 107).
c) is a film viewing device (100) that is formed at one end of a cartridge spool shaft (105d) that rotates with the film (120) and includes a film status display disc (105f) having a film status display mark (105b). The light-shielding member (143), and at least when the film cartridge (106) is loaded.
(143) is closed so that the inside thereof forms a light-shielded, substantially sealed space.
41, 142) and the film (1) of the film cartridge (106) stored in the film cartridge storage space (141, 142).
20) Film feeding means for feeding and rewinding
(124, 132, 139) and film state detection means (140, 160, 161, 166)
When the film cartridge (106) is loaded in the film cartridge storage space (141, 142), the film feeding means (124, 132, 139) controls the rewinding operation of the film (120) of the film cartridge (106). Done,
The film feeding means (124, 132, 139) sends out the film (120) of the film cartridge (106) and the film cartridge when the display at the beginning of loading detected by the film state detection means is the developed state of the film. Light-shielding member for storage space (141, 142)
(143) control means for controlling to open (148, 18
0) and a film viewing device.