JPH08179428A - Slide projector, slide mount and zoom lens driving method for zoom system slide projector - Google Patents

Abstract

PURPOSE: To prevent a video size from being remarkably varied at the time of projecting a reversal film in which different picture sizes coexist by reading picture size information from a recording part in which the picture size information of a slide mount is recorded and deciding a projection magnification. CONSTITUTION: When the picture size information is read from the recording part in which the picture size information of the slide mount M is recorded, the projection magnification is decided by a magnification deciding means based on the detection results. As for the reading, the picture size information is read from the recording part before the slide mount M is loaded on a prescribed position by a loading means 8 for loading the slide mount M on the prescribed position in an optical system in order of projection. The optical system is driven by a driving means 5d for driving a zoom lens in accordance with the magnification decided by the magnification deciding means. Even in the case the picture size of the slide mount M is varied, the video can be projected with an appropriate video size without moving the slide projector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide projector for projecting an image photographed on a reversal film onto a screen, and in particular, a slide mounted on a mount frame whose outer size is constant, although the screen size of the image frame is different. The present invention relates to a slide projector capable of projecting an image on a screen having an approximate size.

[0002]

2. Description of the Related Art There are various viewing methods when shooting with reversal film, but the most common method for general users is to use a slide projector to fill a mount frame and view it on a screen. I am familiar.

It is known that the reversal film has several film sizes as well as the negative film used by general users mainly for photographing. For example, in addition to the "35 mm size" that is most commonly used by general users, the "Brownie size" and "sheet size" used by photography enthusiasts, professional photographers, and sales photo studios are also available. Yes, these have different widths and shapes of the film, so the camera for shooting will be the camera that matches those sizes. These differently sized films differ not only in the film shape and the camera, but also in the screen size to be photographed.

In addition, even if the film size is the same, the screen size of the captured image may be different. For example, when a camera called a half size camera is used. This camera is the same as using "35mm size" film, but the screen size of the captured image is the same as the screen size using a normal 35mm camera (called 35mm standard size). Half the size,
Of course, if you shoot 24 films, you can shoot up to 48. In recent years, the panorama size (14 x 36m
m) and high-definition type (20 x 36 mm) screen sizes have also appeared, and a single camera is "35 mm size"
There is also a camera that uses the same film and can switch the screen size between 35 mm standard size and panorama size by inserting a light shielding frame at the time of shooting. Furthermore, regarding the "Brownie size" film, the size of the screen size is 6 × 4.5 cm, 6 × 6 cm, 6 × 7 cm, 6 × 8 cm, 6 ×
The screen size will differ depending on each dedicated camera, such as 9 cm. The photographed reversal film is usually developed in the lab and then returned to the general user in a mount frame made of plastic or cardboard.

Naturally, the size of the mount frame varies depending on the film size, but the standard size of 35 mm,
Mount frame of 35mm half size, 35mm panorama size, 35mm high-definition type, etc. has the same external dimensions, and the size of the slit window made according to the screen size of the image is different. Is.

On the other hand, looking at the slide projectors necessary for projecting the mounted slides on the screen for viewing, only slide projectors suitable for the size of the mount frame used are commercially available. is there. Therefore, 35mm standard size and half size can be projected by putting them in the same slide projector for projection. However, since the projection magnification of the projection lens of the slide projector is fixed, the installation position of the slide projector for standard size projection and the installation position of the slide projector for half size projection must be changed. For example, the screen size on the screen could not be the same. Naturally, if you try to mix standard size and half size, the screen size on the screen will constantly change, and as a result, it is very ugly,
In addition, there is a problem that eyes are tired. If you attach a zoom lens that can change the projection magnification to the projection lens, there is no problem even if you do not change the position where the slide projector is installed, but it is necessary to move the lens setting position each time the screen size changes. Was still there.

Further, in the very near future, a film for a new system represented by the name of APS (Advanced Photo System) is about to appear on the market. The film size of the reversal film suitable for this new system is not the conventional "35 mm size", and the screen size is a completely new standard size different from the conventional 35 mm standard size and half size. It is obvious that if the size of the mount frame for slides obtained from this new standard size reversal film is different, a slide projector that matches it will be necessary. However, with the conventional mount frame for "35 mm size", if you change the cut window inside to the screen size of the reversal film for APS, you can change it to the conventional "35 mm size".
The slide projector can be used, and it can be used only by changing the installation position of the slide projector or the position of the zoom lens for projection. However, when APS and 35mm size films are mixed,
If the slide is projected as it is, the change of the screen size on the screen becomes a big problem.

In particular, the new APS system of this time is likely to become the mainstream in the future, but it is expected that it will coexist with the standard size of 35 mm for the time being. In that case, considering effective use of the slide projector, the slide mount is the same size as the conventional "35 mm size", and it is effective to change only the screen size. In that case, 35 mm standard size or
It is expected that the frequency of mixed projection with 35 mm half size will be extremely high, and the discomfort of ordinary users when viewing slides will increase further, and the development of a new slide projector compatible with such mixed screen sizes is expected. The situation was getting better.

[0009]

SUMMARY OF THE INVENTION Therefore, according to the present invention, although the external dimensions are held on a mount frame, the image size can be adjusted when a slide is viewed by sequentially projecting a reversal film in which different screen sizes are mixed. Is to provide a slide projector that does not fluctuate significantly.

[0010]

The above object can be achieved by the following means. That is, the slide projector according to claim 1 has a slide mount having a recording unit for recording screen size information of the slide mount, an optical system having a zoom lens capable of changing a projection magnification of the slide mount, and a projection of the slide mount. Loading means for loading at a predetermined position of the optical system in the order of, a screen size reading means for reading the screen size information from the recording unit until the loading means loads the slide mount at the predetermined position, and the screen. It is characterized in that it has a magnification determining means for determining a projection magnification from the detection result of the size reading means, and a driving means for driving the zoom lens according to the magnification determined by the magnification determining means.

A slide projector according to a fourth aspect of the present invention includes a screen size detecting means for detecting a screen size of the slide mount, a magnification determining means for determining a projection magnification from a detection result of the screen size detecting means, and a projection of the slide mount. It is characterized in that it has a zoom lens whose magnification can be changed and a driving means for driving the zoom lens according to the magnification determined by the magnification determining means.

According to the zoom lens driving method of claim 8,
In a method of driving a zoom lens of a zoom type slide projector, a projection magnification by the zoom lens is determined from a detection result of detecting a screen size of a film held on a slide mount, and the zoom lens is adjusted according to the projection magnification. It is characterized by being driven by.

[0013]

According to the above configuration, in the slide projector according to the invention of claim 1, when the screen size reading unit reads the screen size information from the recording unit in which the screen size information of the slide mount is recorded, The magnification determination means determines the projection magnification from the detection result of the screen size reading means. In the reading, the screen size information is read from the recording unit by a loading unit that loads the slide mount in a predetermined position of the optical system in a projection order and loads the slide mound in the predetermined position. An optical system having a zoom lens capable of changing the projection magnification of the slide mount is driven by driving means for driving the zoom lens according to the magnification determined by the magnification determining means. With such an operation, even if the screen size of the slide mount is variously changed, it is possible to project an image with an appropriate image size without moving the slide projector.

Further, in the slide projector according to the invention of claim 4, when the screen size detecting means detects the screen size of the slide mount, the magnification determining means determines the projection magnification from the detection result of the screen size detecting means, A zoom lens capable of changing the projection magnification of the slide mount is driven by a driving unit according to the magnification determined by the magnification determining unit. With such an operation, even if the screen size of the slide mount is variously changed, it is possible to project an image with an appropriate image size without moving the slide projector.

According to the eighth aspect of the present invention, in the method of driving the zoom lens of the zoom type slide projector, the projection magnification by the zoom lens is determined from the detection result of detecting the screen size of the film held on the slide mount. Then, the zoom lens is driven according to the projection magnification. With such an operation, even if the screen size of the slide mount is variously changed, it is possible to project an image with an appropriate image size without moving the slide projector.

In the present invention, an image is an image of a subject fixed on a film, and an image is an image of an image formed by being optically projected on a screen. Projection is to form an image on a screen by a slide projector, and projection is to project a plurality of images in a desired order.

The screen size means not only the size of an image but also the size of an image determined by the film mount functioning as an image frame. The image size is the size of the image when the image is projected at a predetermined enlargement ratio.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of a slide projector of the present invention.

In FIG. 1, a lamp 1 includes a reflector 1b and a lens 1.
It is a reflector type lamp having c and irradiating the white light emitted from the filament 1a in a specific direction.

The heat cut filter 2 prevents the other components of the slide projector and the film mount M filled with the reversal film RF from being affected by the heat radiation of the lamp 1.

The Fresnel lens 3 is a lens for converting white light emitted from the lamp 1 into substantially parallel rays. Since the Fresnel lens 3 can be used in a position close to the lamp 1 to obtain a substantially parallel light beam, the external dimensions of the slide projector can be reduced.

The frosted glass 4 is inserted in the subsequent stage of the Fresnel lens 3 in order to remove the uneven brightness caused by the Fresnel lens 3. That is, when the Fresnel lens 3 is used, unevenness in luminance occurs due to the step provided on the curved surface. Since the light flux passing through the frosted glass 4 is irregularly reflected, it is possible to obtain a light flux having a substantially uniform luminance distribution.

The zoom lens system 5 is a reversal film R.
It is an optical system for changing the projection magnification when projecting the image light transmitted through F on the screen Sc to form an image. In the zoom lens system 5 of this embodiment, the distance between the lenses 5a and 5b is changed to change the projection magnification of the projected image on the screen Sc, and then the focus lens 5c forms image light on the screen Sc. It was configured. The zoom lens system drive mechanism 5d is a drive mechanism that moves the lens 5a, the lens 5b, and the focus lens 5c. That is, the zoom lens system 5 changes the zoom ratio by changing the distance between the lens 5a and the lens 5b by the zoom lens system drive mechanism 5d in accordance with a command from the CPU 9 (described later), and further changes the zoom ratio to a position according to the changed zoom ratio. By moving the focus lens 5c, the zoom ratio is changed and the image is formed on the screen Sc. It goes without saying that the projection magnification is determined by the determination of the zoom ratio. Further, the zoom lens system drive mechanism 5d detects the lens position by the potentiometer, and the information of the zoom ratio can be fed back.

The mount guide 6 connects the film mount M between the frosted glass 4 and the lens 5a.
It is a guide that guides the substantially parallel white light beam obtained in the step 1 and having a uniform luminance distribution to a predetermined position set so as to pass through the entire surface of the reversal film RF packed in the film mount M. That is, the white light beam obtained from the frosted glass 4 becomes image light by passing through the reversal film RF localized at the predetermined position by the mount guide 6, and enters the lens 5a.

The mount magazine 7 has a plurality of compartments 7a, and each compartment 7a holds one film mount M.

The mount loading mechanism 8 is a loading mechanism that sequentially feeds the film mount M loaded in the mount magazine 7 out of the section 7a and conveys the film mount M, and loads the film mount M at a predetermined position defined by the mount guide 6. That is, the mount loading mechanism 8 sequentially ejects the film mounts M from the mount magazine 7. Therefore, if the film mounts M are arranged and held in the mount magazine 7 in the order of showing, the order of showing can be set. In the present embodiment, the film loading M is performed by the mount loading mechanism 8.
The time required to load the lens from the mount magazine 7 to the predetermined position is set to be slightly longer than the time required for the zoom lens system drive mechanism 5d to move from the tele position to the wide position. Therefore, at the end of loading, the zoom lens system 5 can surely project immediately after the magnification change to the set magnification is completed.

The CPU 9 is a central processing unit for sequence control of the slide projector. Output of sensor 11 (described later) that detects screen size information and memory
Reference information (described later) stored in 10 is compared and calculated to determine the zoom ratio of the zoom lens system 5. When the zoom ratio is determined, the CPU 9 causes the zoom lens system drive mechanism 5d.
The lens 5a and the lens 5 according to the zoom ratio.
b, command the shift of the focus lens 5c. Also, C
The PU 9 controls the mount loading mechanism 8 to carry the film mount M to a predetermined position.

The memory 10 is a memory in which data can be written. In this embodiment, the CPU 9 and the memory 10 constitute the magnification determining means of the present invention.

The sensor 11 detects screen size information while the film mount M is moving from the mount magazine 7 to the mount guide 6 by the mount loading mechanism 8.
The sensor 11 outputs data regarding the detected screen size information.

The remote controller 12 is a remote controller for the user to control the operation of the slide projector according to the present invention. The remote controller 12 of the present embodiment enables the slide projector to be controlled by the user by outputting signals relating to the forward feed, the backward feed, and the adjustment of the projection magnification of the film mount M to the CPU 9. Although the remote controller 12 of the present embodiment is shown as a wired type, an infrared type or the like may be applied. Further, in this embodiment, the remote controller 12
Although the slide projector having the above is shown, the operation may be controlled by a controller integrated with the main body of the slide projector.

The screen Sc is a large screen provided with movable curtains Sc2 on both sides of a white cloth Sc1 on which an image is projected by the slide projector of the present invention. The screen Sc has curtains Sc on both sides.
2 can be moved to change the screen width. A projection image can be obtained by the slide projector of the present invention as long as the projection image can be obtained by the conventional slide projector.

The film mount M has a reversal film RF sandwiched between mount frames M1 made of a material such as resin or paper. The film mount M will be described with reference to FIG.

FIG. 2A is a perspective view of the reversal film RF and the mount frame M1. The film mount M is a reversal film RF sandwiched between mount frames M1. The mount frame M1 is composed of resin plate portions M3 and M4 with a folding slit portion M5 interposed therebetween. When the reversal film RF is sandwiched between the plate portions M3 and M4 by mounting the mount frame M1 on the plate in the direction of arrow a, the external dimensions are 50 mm ×
It was a 50 mm square. Notch window M2 is plate M
The plate portion M is provided in each of M3 and M4.
In the state where 3 and M4 are folded from the folding sill part M5, the slit windows M2 are arranged at the same position as each other. Notch window M2
Is a reversal film R while the white light transmitted through the frosted glass 4 is blocked by the mount frame M1 when the film mount M is loaded in a predetermined position.
The light passing through F functions as an image frame for obtaining image light of a desired screen size. The protrusion M6 fits into the fitting hole M7 and locks the plate portions M3 and M4 in a state where the plate portions M3 and M4 are folded from the folding sill portion M5. If the user desires, the lock is released and the plate portions M3 and M4 are opened in the direction of arrow b,
It can be replaced with a new reversal film RF.

FIG. 2B is a perspective view of the Brownie size reversal film RF and the mount frame M1. The mount frame M1b is made of cardboard and holds the reversal film RFb by gluing or heat sealing. Further, the cutout window M2 functions as an image frame. The figure shows a mount frame M1 for holding a 6 cm × 6 cm film.

FIG. 3 is a plan view and a sectional view of the film mount M shown in FIG. FIG. 3A is a plan view of the film mount M, and as described above, the mount frame M1 holds the reversal film RF and the cutout window M2 defines the screen size. The bar code M9 is a screen-size recording unit according to the recording unit of the present invention, and is optically read by an optical reading device that actively detects the presence or absence of reflected light by emitting reading light such as infrared light. It was recorded.

FIG. 3B is a sectional view taken along the line II of FIG. 3A. The mount frame M1 is folded with the reversal film RF held therebetween. In this embodiment, since the head of the protrusion M6 is thicker than the inner diameter of the fitting hole M7, the protrusion M6
6 fits in the fitting hole M7 and locks the plate portions M3 and M4. Since the reversal film RF is surface-supported by the plate portions M3 and M4, it is held so as not to shift.

The film mount M of this embodiment has an outer dimension of 50 mm × 50 mm like the plate portions M3 and M4, and the cut window M2 is of a type corresponding to the screen size of the reversal film RF. Notch window M2
Is a rectangle having a shape slightly smaller than the size of the image fixed on the film because it functions as an image frame.
The slit window M2 of the present embodiment has a vertical dimension and a horizontal dimension that are each 1 mm shorter than the size of the image fixed on the film. In this embodiment, the screen size may mean the size of the image fixed on the film, or may be the size of the image determined by the slit window M2 functioning as an image frame.

FIGS. 4, 5, and 6 are plan views of the film mount M in a state where the reversal film RF of each screen size is held by the mount frame M1. 4, FIG.
As shown in Figure 6, the standard size screen size is 24mm x
36 mm. Panorama size screen size is 14mm x 36
mm. The screen size of the high-definition type is 20 mm ×
36 mm. The half-size screen size is 18 mm x 12 mm. According to the article published in the December 1994 issue of the Photo Industry Magazine, the size of the APS system is about 17 mm x 30 mm. The screen size shown in FIGS. 4, 5 and 6 is the size of the image fixed on the film, and the size of the slit window M2 is 1 mm in both length and width.

FIG. 4A shows a film mount M holding a reversal film RF photographed in a standard size with the camera held in a horizontal position. M8 is a magnetic tape, and the screen size of the film mount M of FIG. 4 (A) is 24 mm × 36.
Information indicating that the size is mm is recorded.

FIG. 4B shows a film mount M holding a reversal film RF photographed in a high-definition size with the camera held horizontally. M8 is a magnetic tape recording the same screen size as shown in FIG. 4A, and the screen size of the film mount M in FIG. 4B is 20.
Information indicating that the size is mm × 36 mm is recorded.

FIG. 4C shows a film mount M holding a reversal film RF photographed in a panoramic size with the camera held horizontally. M9 is a sticker on which a bar code is printed, and information indicating that the screen size of the film mount M of FIG. 4C is 14 mm × 36 mm is recorded.

FIG. 5A shows a film mount M holding a reversal film RF photographed in a half size with the camera held horizontally. M9 is a sticker printed with a bar code recording the screen size similar to that shown in FIG. 4C, and shows that the screen size of the film mount M of FIG. 5A is 18 mm × 24 mm. Information is recorded.

FIG. 5B shows a film mount M holding a reversal film RF photographed in a standard size with the camera held vertically. M8 is a magnetic tape, and the screen size of the film mount M in FIG. 5B is 36 mm × 24.
Information indicating that the size is mm is recorded. Also in FIG.
In the film mount M of (B), the magnetic recording tape according to the recording section of the present invention was arranged at two places. Thereby, even when the reversal film RF photographed in the vertical position and the reversal film RF photographed in the horizontal position are mixed, the film mount M is obtained by the mount frame M1 having the same shape.

FIG. 5C shows a film mount M holding a reversal film RF photographed in half size with the camera held vertically. M9 is a sticker on which a bar code recording the screen size is printed, and information indicating that the screen size of the film mount M in FIG. 5C is 24 mm × 18 mm is recorded. M10 is a tension tape of magnetic tape, and when a half-size reversal film RF obtained by photographing the film mount M of FIG. 5C in a horizontal position is mounted, the magnetic tape M8 is placed at the tension tape of M10. Attach it. Thus, the magnetic tape M8 which is the recording unit
By making it possible to replace the mount frame, the mount frame M1 having the same shape can be separately mounted on the reversal film RF photographed in the vertical position and the reversal film RF photographed in the horizontal position. The magnetic head or the optical sensor according to the reading means of claim 1 is fixed to the slide projector, and the screen size information recorded on the magnetic tape M8 or the bar code M9 is read as the film mount M is conveyed. When the magnetic tape M8 or the bar code M9 is used, it is necessary to arrange the magnetic tape M8 or the bar code M9 so that the transport direction of the film mount M and the reading operation direction of the reading unit coincide with each other. 5 (B) and (C)
The recording portion of the film mount M applicable to both the film photographed in the vertical position and the film photographed in the horizontal position shown in (1) may be a bar code or a magnetic recording tape.

The recording section of the present invention shown in FIGS. 4, 5 and 6 can employ the magnetic tape M8 or the bar code M9 regardless of the screen size.

FIG. 6A shows a film mount M holding a reversal film RF photographed in a panoramic size with the camera held vertically. M9 is a sticker on which a barcode is printed, and information indicating that the screen size of the film mount M of FIG. 6A is 14 mm × 36 mm is recorded. As a background, the composition is used when photographing a vertically long subject such as a waterfall or a building.

FIG. 6B shows the AP with the camera held in the horizontal position.
It is a film mount M holding a reversal film RF photographed with a film for S. M8 is a magnetic tape, and the screen size of the film mount M in FIG.
Information indicating that the size is 17 mm x 30 mm is recorded.

Although not shown, the reversal film RF of brownie size shown in FIG. 2B can also be provided with a recording unit for recording the screen size on the mount frame M1 suitable for each screen size. In addition,
It is also possible to use the mount frame M1 applied to the reversal film RF having the screen size of HDTV (high-definition high-definition) of 16.6 mm length × 29 mm width proposed in 142641.

The information to be recorded in the recording section may be the size of the slit window M2 which is the image frame section of the film mount M, or the screen size information of the reversal film RF. With the reversal film RF for APS, the screen size information can be recorded on the film itself, so the screen size information is read from the film and the bar code or magnetic tape that is the recording unit is automatically created. The recording unit may be provided on the film mount M depending on the system for attaching the recording unit.

The slide projector according to the present embodiment screens the reversal film RF having various screen sizes as described above, so that even if the screen size of the slide mount fluctuates variously, the image can be displayed in an appropriate video size. It is possible to project. In addition, it is possible to reflect the intention of shooting and avoid eye strain.

The operation of the slide projector according to the first embodiment described above will be described. The mount magazine 7 in which the film mounts M are packed in the projection order is set at a predetermined position of the slide projector, and the lamp 1 is turned on to complete the preparation for projection. After that, by sequentially operating the switches of the remote controller 12, the film mount M is sent to a predetermined position on the optical path of the slide projector, and the image light transmitted through the reversal film RF is projected on the screen Sc by the zoom lens system 5.

In the slide projector of the first embodiment,
A sensor 11 for measuring the screen size is incorporated while the film mount M is loaded from the mount magazine 7 to a predetermined position on the optical path. In Example 1, the sensor 11 was a contact sensor. Mount frame M on sensor 11
By detecting whether 1 is passing or the reversal film RF is passing, the time when the slit window of the mount frame M1 crosses is detected to measure the screen size.
That is, as shown in FIG. 3 (B), the surface of the reversal film RF and the surface of the mount frame M1 do not coincide with each other in the same plane, but have a step. It is possible to detect.

The data of the screen size detected by the sensor 11 is used by the CPU 9 for the 35 mm standard size, 35 mm half size, 35 mm panoramic size, 35 mm hi-vision size and APS of the film mount M set at a predetermined position of the mount guide 6. It is determined which of the system compatible film sizes it corresponds to.

When the screen size of the image is known, the size of the image projected on the screen Sc is known, and the zoom lens system 5 for projection is used to approximate the projected screen size.
The CPU 9 built in determines how many zoom ratios should be set. The zoom lens system drive mechanism 5d for changing the zoom ratio of the projection zoom lens is operated by the signal from the CPU 9 to start projection. However, the screen size projected on the screen Sc is the screen size of the slide. Despite being different, it will be projected in a substantially constant size.

That is, regarding the image size when the image corresponding to each screen size is projected on the screen Sc by the slide projector having the fixed zoom ratio, the vertical length on the screen Sc of the image size is defined as the vertical direction size. , And the ratio of the vertical size of each size is 1.00: 0.8, where Lno: Lhi: Lha: Lp: LA = 1.00: 0.8
It becomes 3: 0.75: 0.58: 0.71. (However, Lno is a standard size, Lhi high-definition size, Lha is a half size, Lp is a panoramic size, and LA is a screen size compatible with the APS system.) Therefore, the CPU 9 matches the vertical lengths on the screen Sc. The zoom ratio ZN of the Nth image was changed, and the magnification was changed so that the area of each screen displayed at one time was constant. This zoom ratio ZN is calculated by the CPU 9, and the CPU 9 drives the zoom lens system 5 by the obtained zoom ratio ZN.

By changing the magnification so that the total area of the screen displayed is constant, it is possible to obtain the effect of reducing the fatigue of the eyes of the viewer. That is, since the viewing of the slide by the reversal film RF is generally performed in a room shielded by a dark curtain or the like, the viewer's pupil is wide open. On the other hand, the viewing of the slide photograph captures the reflected light rays from the screen Sc. When the area of the image is changed, the amount of reflected light also changes accordingly, so that the pupil repeatedly opens and closes every time the screen is changed, which causes eye fatigue. However, by changing the magnification so that the area of each screen is constant, even if the screen size expands or shrinks at a stretch, the image size is kept constant, so the amount of fluctuation in the amount of reflected light varies with the conventional slide projector. As a result, the eye fatigue is reduced as a result. Even if standard size, half size, APS film, etc. are mixed, the screen size is rarely changed due to the intention of the composition.
It is suitable when it is known that half size, APS film and the like are mixed.

Next, when changing the magnification, there is a case where the vertical length of the screen on the screen Sc is made constant. In this way, N is set so that the vertical length of the screen becomes constant.
When the zoom ratio ZN of each image is set, when the high-definition size or panorama size reversal film is projected as the next frame after the standard size reversal film is projected, the length in the horizontal direction is expanded at a stretch compared to the standard size. Therefore, the viewer feels a force as the screen size increases. When projecting a series of reversal films shot with a camera having a size switching function, the screen size is usually switched according to the composition of the subject to be shot. Therefore, the reversal film can be projected with an appropriate composition that reflects the photographing intention of the photographer. In addition, if it is controlled to not set the zoom ratio so that the vertical length of the screen is constant only when it is detected that the image is taken in the vertical position, it is possible to shoot in panoramic size. Even if you take a picture of a waterfall or a building with a vertical camera in the vertical position, the vertical length expands at a stretch, so the power is sufficiently transmitted to the viewer.

An example of a flowchart showing the operation of the slide projector of the present invention will be described with reference to FIGS. 7 and 8. FIG. 7 illustrates the operation of the slide projector of the type that performs a preview before the screening and adjusts the size of each image so that it does not exceed the screen Sc.
Since the slide projector is always installed at a predetermined position, the operation of the slide projector which does not need to be previewed before the screening once the zoom ratio is set will be described. 7 and 8, L indicates the screen size, and LN (LN = L1, L2, L3, ...) Indicates the screen size of the Nth film mount M. Lno is standard size, Lhi is high definition size, Lp is panoramic size, Lha is half size, L
A indicates the screen size of the APS film. On the other hand, Z indicates the zoom ratio, Zref is the reference zoom ratio, and ZN (ZN
= Z1, Z2, Z3, ...) is the zoom ratio selected when projecting the Nth film mount M, Zno is a standard size, Zhi is a high-definition size, Zp is a panoramic size, Zha is a half size, and ZA. Is a zoom ratio selected for APS size projection.

FIG. 7 is a flow chart showing the operation of the embodiment of the slide projector according to the present invention. In the slide projector of this embodiment, step 1 (S1)
Then, the screen size L1 of the first film mount M is detected by the sensor 11 while being conveyed from the mount magazine 7 to the predetermined position of the mount guide 6, and the detected screen size information is stored in the memory 10. In step 2 (S2), the reversal film RF packed in the first film mount M is projected on the screen Sc. Step 3 (S3)
Then, the reversal film R projected on the screen Sc
While visually confirming the image of F, the user operates the manual zoom mechanism of the slide projector to determine an appropriate image size, and Z1 = Zre as the zoom ratio at that time.
get f. The manual zoom mechanism is a zoom lens system drive mechanism 5 according to a command from the CPU 9 when the user instructs the remote controller 12 to change the zoom ratio.
d is for driving the zoom lens system 5. In step 4 (S4), the reference zoom ratio Zref determined in step (S3) is stored in the memory 10. Step (S5)
Then, the zoom ratio Z corresponding to each screen size L is set from the screen size L1 and the reference zoom ratio Zref. For example,
When the screen size of the first reversal film RF is the high-definition type, the zoom ratio Zhi at the time of projection of the high-definition type is set to Zhi = Zref. In addition, calculation is performed to obtain a standard size zoom ratio Zn
o, the zoom ratio Zp of the panorama size, the zoom ratio Zha of the half size, and the zoom ratio ZA of the APS size are determined and stored in the memory 10. When the user operates the remote controller 12 to instruct replacement of the film mount M in step 6 (Step 6), the CPU 9 controls the mount loading mechanism 8 to convey the film mount M from the mount magazine 7 to a predetermined position. In step (S7), the screen size L2 of the second film mount M is detected by the sensor 11 while the film mount M is being conveyed by the mount loading mechanism 8. Then step 8a
From step 8e (S8a to S8e), L2 becomes Ln
It specifies which of o, Lhi, Lp, Lha, and LA is applicable. When the screen size L2 of the second sheet is specified, in steps 9a to 9e (S9a to S9e), L
The zoom ratio Z2 for projecting the second film mount M corresponding to 2 is set. The setting of Z2 is performed by previously calculating Zo and Zh stored in the memory 10 in step (S5).
Data of i, Zp, Zha, and ZA may be fetched from the memory 10. In addition, steps 8a to 8e (S8
a to S8e) and steps 9a to 9e (S9a)
The steps from S9e to S9e) are not limited to the order of the embodiment, and can be performed in various orders. Also, steps 8a to 9a (S
8a to S8e), it is not necessary for the LN to compare all screen sizes, and if the screen size is specified, step 9
You may transfer to (S9a-S9e) immediately.

In step 10 (S10), step 9 (S9
a to S9e), the CPU 9 controls the zoom lens system drive mechanism 5d in accordance with Z2 set in the zoom lens system 5
To start moving. In step 11 (S11), the end of the movement of the zoom lens system 5 is detected, and then step 12 (S1)
In 2), the mount loading mechanism 8 detects that the loading of the second film mount M at the predetermined position is completed. In step 13 (S13), the second film mount M is projected on the screen Sc. In step 14 (S14), when the user desires the projection of the N + 1th film mount M during the projection of the Nth film mount M and operates the remote controller 12 to command the N + 1th projection, the procedure is performed. Returns to step 7 (S7). Further, if the size of the LN cannot be specified in steps 8a to 8e (S8a to S8e), it is possible that the conveyance is defective or that the slide projector according to claim 1 is defective in the recording unit.
In step 15 (S15), an alarm is given to the user to warn the user and an inspection is urged.

FIG. 8 is a flow chart showing the operation of another embodiment of the slide projector according to the present invention. However, the flowchart of FIG. 8 is executed by substantially the same procedure as steps 6 (S6) to 14 (S14) of the flowchart of FIG.
The point 10 is that the stored zoom ratio data is set in the initial setting mode. Step (S1)
When the user gives an instruction to replace the film mount M,
The CPU 9 controls the mount loading mechanism 8 to convey the film mount M from the mount magazine 7 to a predetermined position. In step 2 (S2), the sensor 11 is fed while the film mount M is being conveyed by the mount loading mechanism 8.
By the screen size L1 of the first film mount M
To detect. Next, from step 3a to step 3e (S3
a to S3e), L1 is Lno, Lhi, Lp, Lh
a or LA is specified, and in step 4a to step 4e (S4a to S4e), 1 corresponding to L1 is determined.
Zoom ratio Z1 when projecting the first film mount M
Is set. The setting of Z1 is performed in the initial setting mode and stored in the memory 10 as Zno, Zhi, Zp, Zha, Z.
This is performed by taking out the data of A from the memory 10. However,
The procedure from step 3a to step 3e (S3a to S3e) and step 4a to step 4e (S4a to S4e) can be performed in various orders without being limited to the order of the embodiment, and the LN is compared for all screen sizes. If the screen size is specified, step 4 (S4a-
You may move to S4e) immediately. The data of Zno, Zhi, Zp, Zha, ZA calculated in the initial setting mode is
If it is stored in a volatile memory such as a RAM, it will be lost when the power of the slide projector is turned off. Therefore, the CPU 9 transfers the data stored in the memory 10 and calculated in the initial setting mode to an S-RAM having a magnetic recording device or a backup power source.

Here, the initial setting mode will be described.
In the slide projector of the present embodiment, the slide projector is always installed at a predetermined position, so once the zoom ratio is set, it is not necessary to make a preview before each screening.
When the user sets the predetermined position for the first time after purchasing the slide projector of this embodiment, the zoom ratio has not been set, so steps 1 (S1) to 5 (S5) of the procedure shown in FIG. 7 should be executed. It also has an initial setting mode for setting the zoom ratio.

In step 5 (S5) of FIG.
Depending on Z1 set in (S4a to S4e), the CPU
9 controls the zoom lens system drive mechanism 5d to start moving the zoom lens system 5. In step 6 (S6), the end of the movement of the zoom lens system 5 is detected, and then step 7
In (S7), the mount loading mechanism 8 detects that the loading of the first film mount M at the predetermined position is completed. In step 8 (S8), the second film mount M is projected on the screen Sc. In step 9 (S9), when the user desires the projection of the N + 1th film mount M during the projection of the Nth film mount M and operates the remote controller 12 to command the N + 1th projection,
The procedure returns to step 7 (S7).

The slide projector of the present embodiment determines the zoom ratio Zn according to the procedure of FIG. 7 or 8 described above. The Nth reversal film RF is projected with the determined zoom ratio Zn. Here, it is desirable that the movement of the zoom lens system 5 be completed by the time the transport of the film mount M is completed and the film mount M is localized at a predetermined position. If the screen size LN cannot be specified in steps 3a to 3e (S3a to S3e), the process proceeds to step 10 (S10) to issue an alarm.

7 and 8 show an example in which the film mounts M are projected in the order in which they are arranged in the mount magazine 7, the user or the Nth projection is followed by the replay of the previous video. When it is desired to see, it is possible to detect the screen size information of the N-1th film mount M and set the zoom ratio Z. Alternatively, skip one film and set the zoom ratio of the (N + 2) th film. It is also possible to set.

Further, generally, any user changes the position of the camera at the time of photographing. Also, the screen size is not limited to the square size and is not limited to the 35 mm standard size or the 35 mm half size, and the aspect ratio is different, including the APS system compatible film. In other words, the aspect ratio at the time of standing of an image differs depending on whether the position of the camera at the time of shooting is the vertical position or the horizontal position. Normally, when projecting a slide having the same screen size, the setting position of the slide projector is first set so that neither the vertical position shooting screen nor the horizontal position shooting screen is projected. If you want to project slides with different screen sizes, you can set the projection screen of the 35 mm standard size, which has the largest screen size, so that it does not protrude from the screen.

In the screen size measurement according to the present invention, when the vertical position and the horizontal position at the time of photographing are mixed, the control unit judges the aspect ratio of each film size in the memory 10 and stores the film size in the sensor 11. Check against detection.

The zoom lens system drive mechanism 5d in the present invention may have any form as long as it is a device for rotating the zoom lens.

The magnification of the zoom lens for projection in the present invention is not particularly limited, but is preferably a magnification of 35 mm half size close to the standard size of 35 mm, and at least a film size compatible with the APS system is 35 mm. It is a size close to the millimeter standard size.

Further, as the screen size reading means in claim 1, a magnetic head for reading the screen size information magnetically recorded on the magnetic tape M8 according to the recording portion of the present invention of the film mount M, or a bar code M9. An optical sensor or the like that reads screen size information recorded as a graphic pattern can be used.

In the first embodiment, the contact type sensor is used as the sensor relating to the screen size detecting means according to the fourth aspect. However, the slide projector according to the fourth aspect uses the light emitting means and the light receiving means. An optical sensor that detects screen size information based on the difference in transmittance or reflectance between the mount frame M1 and the reversal film RF can also be applied.

[0072]

As described above, according to the slide projectors according to the first and fourth aspects of the present invention, even if the screen size of the slide mount is variously changed, the image can be properly displayed without moving the slide projector. It becomes possible to project depending on the image size.

Even when the screen size of the slide mount is variously changed by the method of driving the zoom lens according to the eighth aspect of the present invention, the image can be projected with an appropriate image size.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a slide projector of the present invention.

FIG. 2 is a perspective view of a reversal film and a mount frame of the present invention.

FIG. 3 is a plan view and a cross-sectional view of a film mount of the present invention.

FIG. 4 is a plan view of the film mount of the present invention.

FIG. 5 is a plan view of the film mount of the present invention.

FIG. 6 is a plan view of the film mount of the present invention.

FIG. 7 is a flowchart showing an operation of the slide projector of the present invention.

FIG. 8 is a flowchart showing another operation of the slide projector of the present invention.

[Explanation of symbols]

 1 Lamp 2 Heat Cut Filter 3 Fresnel Lens 4 Frosted Glass 5 Zoom Lens System 5d Zoom Lens System Drive Mechanism 6 Mount Guide 7 Mount Magazine 8 Mount Loading Mechanism 9 CPU 10 Memory 11 Sensor 12 Remote Controller M Film Mount M1 Mount Frame M2 Cut Window M8 Magnetic tape M9 Sticker with a barcode printed RF reversal film

Claims (9)

[Claims] 1. A slide mount having a recording unit for recording screen size information of the slide mount, an optical system having a zoom lens capable of changing a projection magnification of the slide mount, and the optical system arranged in the projection order of the slide mount. A loading means for loading the system at a predetermined position; a screen size reading means for reading the screen size information from the recording unit until the loading means loads the slide mount at the predetermined position; and detection of the screen size reading means. A slide projector comprising: a magnification determining unit that determines a projection magnification from a result; and a driving unit that drives the zoom lens according to the magnification determined by the magnification determining unit. 2. The slide projector according to claim 1, wherein the screen size reading means is an optical sensor. 3. The slide projector according to claim 1, wherein the screen size reading means is a magnetic head. 4. A screen size detecting means for detecting a screen size of a slide mount, a magnification determining means for determining a projection magnification from a detection result of the screen size detecting means, and a zoom lens capable of changing a projection magnification of the slide mount. And a drive unit that drives the zoom lens according to the magnification determined by the magnification determination unit. 5. The slide projector according to claim 4, wherein the screen size detecting means is an optical sensor. 6. The slide projector according to claim 4, wherein the screen size detecting means is a magnetic head. 7. A slide mount for holding a film to be projected, comprising a recording unit for recording screen size information of the film. 8. A method of driving a zoom lens of a zoom type slide projector, wherein the projection magnification of the zoom lens is determined from a detection result obtained by detecting a screen size of a film held in a slide mount, and the zoom lens is A method of driving a zoom lens, wherein the zoom lens is driven according to the projection magnification. 9. The method of driving a zoom lens according to claim 8, wherein the screen size is magnetically or optically recorded on a slide mount.