JPH0264621A - Film type camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a film type camera.

[Summary of the invention]

This invention enables continuous film feeding in a camera using 35 mm wide film with an enlarged effective photographing area by detecting film feed by a predetermined detection means.

[Conventional technology]

Currently, there are 3 types of photographic films commonly used:
511ffl film (system 135), its size and characteristics of the photosensitive material are specified by JIS, "O8", etc.

Figure 7 shows some of the specified sizes (Wf tolerance is omitted), the width of film (1) is 35 mm, and the perforation for film feeding (2
) is 25 mm, and the pitch of perforations (2) is 4.75 m+w. and,
For such a film (11), the piece (3) is 24 mm in the width direction of the film (1) and 36 m in the length direction.
It is formed into a rectangle of size ++, and this piece (
The pitch of 3) is 38m111, eight times the pitch of perforage run (2).

By the way, as a method for improving the image quality of such film (1), especially the M image resolution, the photosensitive material applied to the i film is improved.

ii. Increase the width of the film and make the frame larger.

is possible.

However, since -i is inversely proportional to the fineness of the grains of the photosensitive material, that is, the resolution, and the film sensitivity, it is difficult to improve the image quality around i unless a new photosensitive material is discovered.

On the other hand, according to the method in item ii, image quality can be improved using the current photosensitive material, but as the width of the film increases, the camera becomes larger and heavier, and various products become difficult to use. Don't get discouraged by the current trend of becoming smaller and lighter.

Therefore, the inventor of the present invention has proposed using a film having the same width as the current 3511III film to improve image quality.

In other words, if you do that, the camera will become larger and ff1
There is no possibility of oxidation. In addition, current equipment such as film manufacturing equipment and processed film processing equipment can be used as is, and current 35III film equipment can also be used in combination.For example, wide film coated with photosensitive material can be processed into 35mm The equipment for cutting to width, the production equipment for standardized cartridges, and the equipment for winding the cut film into the cartridges are automated and large-scale equipment, but these equipment can be used as is. .

In addition, post-shooting processing, that is, development, printing, and enlarging, is automated, and all processing equipment is designed based on a film width of 35 m+s, so it is not possible to change the film width. is not practical.

Therefore, it is practical to improve the image quality by setting the width of the film to 35m5+, which is the same as the current 35mm film.

By the way, although the current 3511II film has a width of 35++u++, the frame length in the width direction is 24 am, so the effective photographing area is narrow.

This is because the perforations (2) through which the camera sprocket feeds the film are provided on both sides of the film (11).

On the other hand, with the advancement of electronics in cameras, drive control by motors can be performed with considerable precision, and film can be driven with sufficient precision without using conventional large sprockets and perforations.
This was confirmed by experiment.

Therefore, the inventor of the present invention has also proposed removing the perforation from a 35ml film and expanding the length of the frame in the film width direction to the position where the perforation was located. In other words, by doing so, the effective photographing area can be expanded by about 40%, and the image quality can be improved by that much.

That is, as shown in FIG. 8A, the width of the film (1) is 35 Ill1 m, which is equal to the current film width, and no perforations are provided.

The length of frame (3), which is the effective shooting area, in the film width direction and the length in the film length direction are as follows:
30mm and 40n++++.

Furthermore, the pitch of the piece (3), that is, the pitch of the film (11
The feed pitch is 42.0 mm.

However, the size and pitch of this piece (3) are compatible with the current television broadcasting system, so
The aspect ratio of piece (3) is 3:4.

When dealing with HDTV (so-called high-definition), as shown in Figure B, the size of the piece (3) is 30n+m x 53.3mm, and the pitch is 57, 75.
Let it be mm.

Note that the aspect ratio is 9:16.

Furthermore, the above values are for full size, and for half size, as shown in C and D in the same figure, in the current television broadcasting system, the size of piece (3) is 30 nuy.
+X 22.5+yu++, pitch is 26.2ff+m
, When HDTV (7), the size of piece (3) is 30+w
mX 16.9n+m, pitch 21.0mm.

And films with more formats! 1) is stored in a cartridge (not shown) similar to the current 35 mm film.

Therefore, as shown in Figure A, 13, if the length of the frame (3) in the film width direction is 30 mm, this is 1.25 times the length of the current 35 mm film, which is 24 mm in the film width direction. Image quality (resolution) is 25%
It will improve.

Also, if the length of frame (3) in the film length direction is also enlarged at the same ratio, then 1.25X 1.25
', 1.56, which is an improvement in image quality of 56%.

Furthermore, when comparing the area per piece, the current area:
24mmX 36mm = 864mm'Figure 8A
: 30nn+X 40n+m=1200mm', so the area of one frame increases by about 39%, that is, the image quality improves by about 39%.

Furthermore, if the same image quality is acceptable, it is possible to enlarge the image even more.

In addition, as shown in C and D of the same figure, even if it is half-size, the long side of the frame (3) is close to the width of 36 mm in the length direction of the current full-size film, so the image quality is close to that of full-size. Obtainable.

Furthermore, piece (3) film! Goodness in singing direction is 3
(l m m), so a non-photographing area of 2.5 mm can be obtained between the frame (3) and both edges of the film (11), and this allows the plane of the film (l) to be fixed at the time of photographing. It is possible to ensure security, read and write data, etc.

Furthermore, since there is no need to provide the camera with a film feeding sprocket, the camera can be made smaller and lighter.

FIG. 9 shows another example of the pitch of the pieces (3), and even with this pitch, the same effect as the first format can be obtained.

[Problem to be solved by the invention]

This invention enables the feeding of the film (11) at the correct frame pitch for the film (1) without perforations (2) as described above.

[Means to solve the problem]

Therefore, in the present invention, the camera is provided with a detection roller that rolls into contact with the film (11), and the film (11) is fed at the correct frame pitch based on the rotation of the detection roller.

(Function) The rotating stage of the film winding shaft is controlled based on the detection output of the detection roller, and the film (1) is fed at the correct frame pitch.

〔Example〕

FIG. 1 is a partial sectional view of an example of a camera according to the present invention, and the cross section is taken along a plane parallel to the bottom surface of a dark box portion of the camera. Moreover, FIG. 2 is a rear view with the back cover removed.

The center of the body (11) is a dark box (12),
A lens (13) is provided in the front opening.

Further, one inside part of the body (11), the left side in the figure, is a cartridge storage part (14), and a film supply shaft (15) is provided above it.
The cartridge (5) containing the film (1) described above is inserted so as to fit into the cartridge (15).

Further, a film winding shaft (16) is provided on the other inner side of the body (II), on the right side in the figure.

This winding shaft (16) is driven by a motor to be described later to wind up the film (1).
The circumferential surface of the winding shaft (16) is coated with a high friction material (17) such as neobrane, for example, as shown in FIG. 3Illll's Film Guide (1
8A) to ('18c) are provided.

These guides (18A) to (18c) are connected to the winding shaft (1
6) is linear in the direction parallel to the central axis and arcuate in the direction orthogonal to it. As shown in FIG. 4, some ends of the guides (18^) to (18C) on the arc side are supported by the shaft (181') relative to the body (11), and are supported by torsion springs. (182), the other end is brought into pressure contact with the winding shaft (16). Plus, Guy! - At the ends of (18A) to (IBC) on the winding shaft (16) side, there is a film press roller (
IOA) to (IOC) are supported so as to be parallel to the central axis of the car lifting shaft (16).

As shown in FIG. 4, a high friction material (101) is coated on the circumferential surface of the roller (IOA), and the
(IOA) has a predetermined diameter, and a permanent magnet (31) magnetized with NS in the radial direction is integrally fixed to a part of this roller (IOA).
) A Hall element (32) is provided on the guide (18A) facing the guide (18A).

The rear opening of the dark box (12) is a rectangular aperture of, for example, 39 mm (in the film width direction) x 40n+m (in the film length direction), corresponding to the frame (3) of the film (1) described above. 19). However, the aperture (19) does not come into close contact with the film (1) during shooting, and the light that reaches the film (11) from the lens (13) is not a parallel ray, so the frame (11) of the film (11) 3) Size 30mmX 40+u
If +, the size of the opening (19) is 30mm x 40
It is made slightly smaller than m5.

Further, at the rear of the dark box (12), on both sides of the opening (19) in the film width direction, there is a lug along the opening (19) and over at least the range of the opening (19).
A pair of film guide rails (21) are provided in parallel.

Regarding the finder, aperture, shank, etc.
It is configured similarly to current cameras. Further, a film feed amount detection circuit as shown in FIG. 5, for example, is provided.

According to such a configuration, at the time of photographing, the cartridge (5) is set in the storage section (14), and the film +11 reaches the winding shaft (16) from the cartridge (5) through the opening (19). And at this time, film (1)
The winding shaft (16
), the film (11 is pressed against the winding shaft (1
When the film 6) rotates, its winding is taken up on the shaft (16), that is, the film +11 is fed even without the part olefin.

When the film is fed, the roller (IOA) and the magnet (31) rotate in response to the feeding of the film (11).
The rotation of the magnet (31) is detected by the Hall element (32), and the amount of rotation of the winding shaft (16) is controlled based on this detection output.

Therefore, the film (1) is fed at a pitch of frames (3) corresponding to the format.

FIG. 5 shows an example of a film feed amount detection circuit.

In this case, if the pitch of the piece (3) is the numerical value explained in FIG. 8, these values are: 42.0+wm depth 5.25m*X 8 57.75vs = 5.25mmX 1126.
25mm -5,25mmX 521.0mm=5.
25mmX 4 , all of which are integral multiples of 5.25n+m, and 5.25+*πX 3.34o+m/2.

Therefore, the feed amount of the film (11) is the same as that of the detection roller (
10^) is set to 3.34++n, it is sufficient to detect an integer number of rotations, and the resolution can be set to 1/2 rotations.

Also, in the case of the pitch of piece (3) in Figure 9, 44, O
ym=6.2El++mx 756.5mm-6,2
8m5X 9 25.1pm=6.280111X 41B, 8n++
++-6,28m-× 36.28m1II=πX4.
OO = m/2, the number of rotations of the detection roller (IOA) becomes an integral number of times, and the resolution also becomes 1/2 rotation.

Therefore, the diameter of the detection roller (10^) is set to 3.34+m or 4.01, and the magnet (31) is set to have a bipolar donut shape as described above.

Therefore, from the Hall element (32), the magnet (31)
The detection voltage E shown in FIG. 6A changes in accordance with the rotation of the
a is taken out, and this voltage Ea is sent to the voltage comparator circuit (33).
as shown in Figure B, it is shaped into a rectangular wave voltage Eb with a period corresponding to the rotation of the magnet (31).
b is a differential circuit (34A).

(34B), and a falling differential pulse Pa and a rising differential pulse pb are extracted as shown in FIG.

These pulses Pa and Pb are connected to the voltage comparator circuit (35
), as shown in the figure, 1/2 of the voltage Ea
One pulse Pd is taken out every period, ie every 1!2 revolutions of the magnet (31), and this pulse Pd is supplied to the system controller (34).

This system controller (36) is used to set the overall operation of this camera, such as the aperture value and shank speed. is 5.25nua or 6.28
Since only VS is fed, the rotation amount of the drive motor (38) of the winding shaft (16) is changed through the drive amplifier (37) so that the number of pulses PdO becomes a count value corresponding to the size of the piece (3). controlled.

For example, if the pitch is 42r*ta, the film (1) is fed until eight pulses Pd are obtained.

Therefore, the film (1) is fed with a pinch of the frame (3) corresponding to the above-mentioned format.

Thus, according to the present invention, the film (1) can be fed at the correct frame pitch even if the film (1) does not have the bar fore thinning (2). In this case, the magnet (31) for detecting the feed amount of the film (1) may be a bipolar magnet, so the cost is very low. In addition, since both the rising and falling points of the obtained voltage Eb are counted and used to detect the feed amount of the film ([), even if the magnet (31) is a bipolar magnet, the detection The resolution when the roller (10^) detects the feed amount of the film (1) can be made 1!2 revolutions.

Furthermore, when the diameter of the detection roller (10^) is small,
The slip between the film (1) and the roller (10^) increases and the detection accuracy decreases;
) has a large diameter, the roller (IOA) requires a large torque when feeding the film (L), which also increases slippage and reduces the detection accuracy. If the value is as described above, the amount of feed of the film (1) can be appropriately detected without causing such a problem.

In addition, in the above, the film (1) may be either a positive film or a negative film, and shooting data etc. are written in the non-effective shooting area between the edge of the film +11 and the frame (3). or film (
Data indicating the standard 1) can also be recorded in advance. Furthermore, the Hall element (32) can also be provided on the back cover or the pressure plate (23).

H Effects of the Invention According to this invention, even if the film (11) does not have the bar fore thinning (2), the film (1) can be fed at the correct frame pitch. The magnet (31) for detecting can be a bipolar magnet, so it is very low cost.Also, both the rising and falling points of the obtained voltage gb are counted and the feed rate of the film (11) is measured. Since it is used for detection, even if the magnet (31) is a bipolar magnet, the resolution when the detection roller (10^) detects the feed amount of the film +1) can be made 1!2 rotations.

Furthermore, when the diameter of the detection roller (10^) is small,
The slip between the film (1) and the roller (10^) is thick (and the detection accuracy is reduced).
) when the diameter of the roller (10^) is large, the roller (10^ is
A large torque is required when feeding the roller (10), which also increases slip and reduces detection accuracy, but if the diameter of the roller (10^) is as described above, such a problem will not occur. The feed amount of the film (1) can be detected appropriately without any problems.

[Brief explanation of the drawing]

1 and 2 are top and rear views showing an example of a camera according to the present invention, FIGS. 3 and 4 are exploded perspective views of its main parts, and FIG. 5 is a connection of an example of its detection circuit. figure,! @6
9 to 9 are diagrams for explaining the present invention. (1) is 3511!1 film, (3) is frame, (5) is cartridge, (12) is dark box, (16) is film winding shaft, (21), (22) is film guide rail, (24) is the rail, (31) is the permanent magnet, (32
) is a Hall element, and (33) and (3!5) are voltage comparison circuits.

Claims (1)

[Claims] A roller that contacts one surface of a film and rotates as the film is fed, a magnet provided on this roller, and a device that detects changes in magnetic flux that change due to the rotation of this magnet. What is claimed is: 1. A film camera comprising a Hall element, detecting rotation of a roller based on a change in voltage generated in the Hall element, and using the detection output as a frame feed control signal for the film.