JPH0943713A - Photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an image having always no flowing and sufficient light quantity based on a photographing light whose optical axis is corrected by correcting the optical axis angle of a photographing light to be supplied to a film for recording in accordance with the traveling position of the film. SOLUTION: A movie film 2 is traveled at a fixed speed by a feeding reel 3A and a take-up reel 3B. At that time, since the traveling of the film 2 is detected and calculated by film position detecting parts 15, 16 and a CPU 7 and a control signal corresponding to the detected and calculated result is transmitted to respective drivers 4A, 4B, the movie film 2 is stably traveled at the fixed speed. Then, an object photographing light L2 passed through a photographic optical system 6 is image-formed on respective recording frame areas ARs of the movie film 2 to be recorded. At this time, the optical axis angle correcting system 6 is moved in the direction of the arrow (a) by responding to the traveling of the movie film 2. Consequently, the projecting optical axis angle of the object photographing light L2 to the film 2 is corrected in accordance with the traveling of the film 2.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Technical Field to which the Invention pertains Prior Art Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (FIGS. 1 to 3) Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing apparatus, and can be applied to, for example, a movie film photographing machine for sequentially recording an image of one frame on a movie film.

[0003]

2. Description of the Related Art Conventionally, as this type of photographing apparatus, 35 [m
19 mm pitch and 24 s / s on a film of [m] width
There is one that records the image of the piece. Here, in this type of photographing apparatus, the movie film to be recorded is so-called intermittently fed so as to be stopped 24 times per second, and is provided between the photographing section and the movie film when the movie film is stopped. By opening the shutter, the images are recorded so that 24 frames per second are lined up on the film.

That is, the operation of temporarily stopping the film and maintaining the opened state of the shutter for a while is performed 24 times per second when one frame is aligned with the photographing optical axis. In the current movie, for example, a perforation is provided on both sides of a 35 [mm] movie film, and the film is transferred and stopped intermittently at 24 frames per second (one frame feed pitch 19 [mm]) by a sprocket that meshes with the perforation. , The video of each frame is shot to realize movie shooting.

[0005]

By the way, the intermittent feeding mechanism for realizing the intermittent feeding of the above-mentioned movie film is composed of a ze-spring mechanism, a cam such as a scraping mechanism, and a link, so that its structure is very complicated. As a result, there is a problem that the overall configuration of the image capturing apparatus becomes large. Further, there is a problem that it is difficult to avoid mechanical noise due to the intermittent feeding mechanism, and there is also a problem that service and maintenance are troublesome.

Further, in the conventional photographing apparatus, since the tension which is excessively changed is added to the film by the intermittent feeding mechanism, the perforation of the film having low rigidity is deformed or damaged by the intermittent concentrated load by the sprocket. May occur. As a result, there is a possibility that the timing of feeding the film frame may be deviated to prevent proper photographing, and further, the film feeding may become impossible (impossibility of photographing).

Further, if the perforations are provided on both sides of the film, there is a problem that the effective photographing area which can be recorded on the film is narrowed accordingly. As one method for solving this, for example, a method has been proposed in which a perforation is provided only on one side of the film (Japanese Patent Laid-Open No. 2-6421). As a device for driving such a film, the film is driven by the frictional force of a friction wheel, the film is sandwiched between a rotary drum and an idler, and the idler is brought into contact with and separated from the rotary drum to intermittently feed the film (frame feed). Then, the brake shoe is pressed against the film to stop and fix the film.

However, in this photographing apparatus, since intermittent feeding by a friction wheel is made by positively contacting a very delicate film surface, there is a risk that the film may be damaged and proper photographing may be hindered. is there. There is also a problem that the film expands and contracts intermittently to promote the deformation of the film.

Since all of these problems are caused by intermittently feeding the film, it is considered that all the above-mentioned problems can be solved if each image frame can be recorded while feeding the film at a constant speed. However, if the film is recorded while traveling at a constant speed, a continuous stream of images will be captured on the film. Therefore, in order to prevent the recorded image from flowing, it is conceivable that the shutter is opened and recorded only at the moment when the positions of the frames moving at a constant speed match the photographing optical axis. However, in such a case, the opening time of the shutter becomes very short, so that there is a problem that the filming light sufficient for recording the film is not supplied to the film.

The present invention has been made in consideration of the above points, and an object thereof is to propose an image pickup apparatus capable of solving all the problems of the related art.

[0011]

In order to solve such a problem, in the present invention, the recording film is driven and driven at a constant speed, and the optical axis angle of the photographing light supplied onto the recording film is set to the traveling position of the film. According to the above.

As a result, even though the recording film is moving, an image having no light and a sufficient amount of light is always supplied based on the optical axis-corrected photographing light, even though the recording film is moving.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a photographing apparatus to which the present invention is applied as a whole, and a photographed image is recorded on the movie film 2 while driving the movie film 2 at a constant speed. The photographing device 1 detects a movement amount of a film traveling means for traveling the movie film 2 at a constant speed, a photographing light forming means for sequentially forming photographing light corresponding to an image of one frame, and a movement amount of a photographing frame position of the movie film 2. The film position detecting means and the optical axis angle correcting means are provided for recording a flow-free image on the movie film 2 which is driven at a constant speed, and a sufficient amount of photographing light on the movie film 2. To be able to supply.

The film running means winds the supply reel 3A which supplies the unphotographed 35 [mm] movie film 2 at a constant speed and the movie film 2 which is rotationally driven at substantially the same speed as the supply reel 3A. By using the take-up reel 3B, the movie film 2 is run at a constant speed at a pitch of 19 [mm] × 24 [pieces / sec]. Here, an electric motor (not shown) is provided corresponding to each of the supply reel 3A and the take-up reel 3B, and the electric motor is driven by the drivers 4A and 4B, whereby the supply reel 3A and The rotation speed of the take-up reel 3B is controlled so that the movie film 2 has 24 [frames / s.
ec] is driven at a constant speed.

The photographing light forming means uses the subject image light L1 projected from the subject 5 as the photographing light L2 for the movie film 2.
Of the photographing optical system 6 for projecting toward the target image frame of
A shutter driver 8 controlled by a (central processing unit) 7, a shutter drive actuator 9 connected to the shutter driver 8, and 24 [frames / sec] driven by the shutter drive actuator 9. The shutter 10 shields the photographing light L2 in synchronization with the frame.

The optical axis angle correcting means also serves as the photographing optical system 6, and slides the slider 11 formed of permanent magnets and air-core coils which are vertically connected to the holder of the photographing optical system 6 in the radial direction. A so-called VCM (voice coil motor) is configured by the guide 12 that is movably supported. As a result, the optical axis angle correction means operates the photographing optical system 6
Is displaced and driven in a direction perpendicular to the optical axis (direction indicated by arrow a in the figure), that is, in a direction parallel to the traveling direction of the movie film 2, to correct the optical axis angle. Further, the optical axis angle correcting means is provided with a position detecting section for detecting the position of the photographing optical system 6, and the position detecting section includes a position detecting coil 13 formed at the upper end of the air-core coil and a position detecting coil. The position detection signal output circuit 14 outputs a position detection signal corresponding to the detection current from the coil 13 to the CPU 7.

The film position detecting means is an LED (Light
A light source 15 composed of an Emitting Diode) and a photodetection element 16 composed of a line sensor are provided so as to sandwich the movie film 2, and detect an index of the movie film 2. Then, the detection signal is sent to the CPU 7, and the CPU
7, the position and speed of the film piece is detected. Here, as the index of the movie film 2, for example, when four per-frames (not shown) provided on one side of the film of the movie film 2 are used, the perforations which have passed through the film position detecting means are used. The number of scenes may be counted by the CPU 7.

The CPU 7 drives the supply reel 3A and the take-up reel 3B so that the movie film 2 runs at a constant speed by sending a control signal to the drivers 4A and 4B based on the detection signal from the film position detecting means. At the same time, by sending a control signal to the shutter driver 8, the shutter 10 is opened / closed according to the traveling position of the movie film 2. Further, the CPU 7 performs a comparison calculation based on the detection signal from the film position detection means and the position detection signal from the position detection section of the photographing optical system 6, and outputs a control signal corresponding to the comparison calculation result to the VMC driver 17. By sending out, the photographing optical system 6 is moved according to the traveling position of the movie film 2.

In the above structure, the movie film 2 is run at a constant speed by the supply reel 3A and the take-up reel 3B. At that time, the running of the movie film 2 is detected and calculated by the film position detection units 15 and 16 and the CPU 7, and a control signal according to the detection calculation result is sent from the CPU 7 to each driver 4A, 4B, The movie film 2 is stably driven at a constant speed.

As a result, the recording frame area A of the movie film 2
R (that is, the recording area for one frame) sequentially passes through the shooting area at a constant speed of 24 frames per second, and the subject shooting light L2 that has passed through the shooting optical system 6 passes through the shutter 10 and each recording frame area AR of the movie film 2. Imaged and recorded on top. At this time, the optical axis angle correction system 6 responds to the running of the movie film 2 and the arrow a
Move in the direction of.

As a result, the projection optical axis angle of the subject photographing light L2 onto the movie film 2 can be continuously corrected in accordance with the running of the movie film 2, and the subject is recorded in the recording frame area AR on the movie film 2. The image can be projected without changing. Thus, the image recorded on the projection film 2 does not flow, and the subject photographing light L2 having a sufficient light amount can be supplied onto the projection film 2.

Since the photographing apparatus 1 projects the subject photographing light L2 which does not flow in the recording frame area AR of the movie film 2 in this way, the photographing optical obtained through the position detection coil 13 and the position detection signal output circuit 14 is used. The CPU 7 compares and calculates the position detection signal of the system 6 and the traveling position of the movie film 2 (that is, the position of the recording frame area AR) obtained through the position detection element 16, and based on the calculation result, the subject photographing light L
The correction amount of the optical axis angle of 1 is set, and the position change amount of the photographing optical system 6 is determined based on the set value, and the photographing optical system 6 is set to the position of the recording frame area AR via the VCM driver 17. Displace it to the proper position.

In addition, the photographing device 1 has a recording frame area AR for one frame.
When the recording of the subject photographing light L2 onto the object is finished, the photographing optical system 6 is moved at a high speed in the direction opposite to the direction of the arrow a to return to the initial position, and then the photographing optical system 6 is moved to the movie film 2 as described above. The subject photographing light L2 is recorded in the recording frame area AR for the next one frame while moving in the direction of arrow a in response to traveling.

The photographing apparatus 1 closes the shutter 10 during the conversion period in which the photographing optical system 6 is returned to the initial position. As a result, during the period in which the photographing optical system 6 moves in the direction opposite to the arrow a, the subject photographing light L2 is not supplied to the movie film 2, so that the image flow due to the rapid displacement of the photographing optical system 6 in the conversion period. Is not photographed.

In order for the photographing apparatus 1 to accurately close the shutter 10 in the conversion period, the position detection signal of the photographing optical system 6 obtained through the position detection coil 13 and the position detection signal output circuit 14 is used. , The traveling position of the movie film 2 obtained through the position detecting element 16 is compared and calculated by the CPU 7 to obtain the conversion period, and the shutter driver 8 is controlled so that the shutter 10 is closed during the conversion period. Send a control signal.

Here, referring to FIG. 2, the photographing apparatus 1 of the embodiment
At the moving position of the recording frame area AR of the unphotographed movie film 2 (A, B,
The optical axis correction based on the displacement of the photographing optical system 6 with respect to C, D, and E) will be described. Note that the reference line indicated by the alternate long and short dash line in FIG. 2 is a line connecting the photographing center position C of the photographing device 1 and the subject center 5A of the subject position 5.

In FIG. 2A, if the distance from the subject 5 to the recording frame area AR is a and the distance to the photographing optical system 6 is b, the recording frame area AR at constant speed is in the section ABC. Since the height of the center B of the recording frame area AR is at the position H from the reference line, it is advisable to provide the photographing optical system 6 on the angle H / a line for projecting the subject center 5A to the position B of the movie film 2. Good. Therefore, the height h of the center of the photographing optical system 6
, The photographing optical system 6 is displaced to a position where h = (b / a) × H, and the subject center 5A is projected to the position B on the movie film 2 via the photographing optical system 6. This Figure 2 (1)
The position of the recording frame area AR and the position of the photographing optical system 6 are the photographing start position for one frame and the initial position of the photographing optical system 6.

Next, as shown in FIG. 2B, in the process of moving the recording frame area AR at a constant speed to reach the section of BCD, the photographing optical system 6 is also sequentially corresponding to h = (b / a). When the center of the recording frame area AR coincides with the position C as shown in the figure, the height h of the center of the photographing optical system 6 coincides with the reference line. Further FIG.
As shown in (3), the recording frame area AR moves and the CDE
In the section of, the height of the center of the recording frame area AR becomes -H from the reference line, and the height of the center of the photographing optical system 6 becomes -h. Here, the next recording frame area AR is A shown in FIG.
Since it is the section of BC, the photographing optical system 6 is also displaced to the height h of the initial position at high speed. At this time, the shutter 10 is closed.

According to the above-mentioned structure, the photographing optical that allows the film 2 to run at a constant speed and corrects the optical axis according to the running position of the film 2 to project the image of the subject on the film 2 without changing the image. Since the system 6 is provided, it is possible to supply the subject photographing light L2 having no flow and a sufficient light amount without using the intermittent feeding mechanism.

Since the intermittent feeding mechanism can be omitted in this manner, the photographing apparatus 1 having a simple structure can be realized. Further, mechanical noise due to the intermittent feeding mechanism can be eliminated. Moreover, service and maintenance can be facilitated. Further, since the film 2 is always given a constant tension, deformation and damage of the perforation and deformation of the film 2 can be avoided, and the life of the film 2 can be extended.

Further, the supply reel 3A and the take-up reel 3B
Since the film 2 can be run by itself, the perforation can be omitted. As a result, the area of the film 2 can be effectively used and the information area of the film 2 can be expanded. This makes it possible to record movies with high image quality and sound quality.

In the above-described embodiment, the photographing optical system 6 including a lens is also used as the optical axis angle correcting means for correcting the optical axis angle of the photographing light according to the traveling position of the recording film, and the photographing optical system is used. Although the case where the lens of the system 6 is moved in the direction perpendicular to the optical axis direction has been described, the optical axis angle correction means is not limited to this, and as shown in FIG. 3, the apex angle variable prism (see FIG. 3A) is used. ), A combination of a plano-convex lens and a plano-concave lens (Fig. 3 (2)), and a rotating mirror (Fig. 3 (3))
Alternatively, a liquid crystal prism (FIG. 3 (4)) or the like may be used. Note that FIG. 3 is shown with the shutter omitted.

Here, a vertical angle variable prism (VAP (Variable Angle Prism)) 20 shown in FIG. 3 (1) has a liquid enclosed therein, and the vertical angle can be changed by appropriately moving the liquid. Has been done. Therefore, if the apex angle is changed according to the traveling position of the recording film 2, the optical axis angle of the photographing light formed by the photographing lens 19 is corrected and projected onto the recording film 2. be able to.

A plano-convex lens 3 as shown in FIG.
In the configuration in which 0 and the plano-concave lens 31 are combined, the convex surface of the plano-convex lens 30 and the concave surface of the plano-concave lens 31 are slid in accordance with the traveling position of the recording film 2 so that each lens or the flat surface of one lens is moved. Incline. As a result, the optical axis angle of the photographing light can be corrected according to the sliding position.

Further, as shown in FIG. 3C, the rotating mirror 40
In the configuration using, the optical axis angle of the photographing light is corrected by rotating the rotary mirror 40 pivotally supported by the rotary shaft 40A according to the traveling position of the recording film 2. At this time, the image is inverted by only one mirror, so another mirror 41 is provided. Further, in the liquid crystal prism 50 shown in FIG. 3 (4), the refractive index is changed by changing the voltage of each transparent electrode according to the moving position of the recording film 2, and as a result, the refraction angle of the transmitted light is changed. Correct the optical axis.

Further, in the above-mentioned embodiment, the perforation is used as an index for detecting the running position of the recording film 2, and the film position detecting means for detecting the running position of the recording film 2 is the light source. 15,
The case in which the light detecting element 16 for detecting the light source light that has passed through the perforation is used has been described, but the film position detecting means of the present invention is not limited to this, and for example, recording without an index such as perforation. The film for use may be provided with a rotating roller that rotates in contact with the film for recording, and the amount of rotation of the rotating roller may be measured by a tachometer. The point is to detect the running position of the film for recording. Anything is fine.

Furthermore, in the above-described embodiments, the case where the present invention is applied to the photographing apparatus 1 for recording a subject image on the movie film 2 has been described, but the present invention is not limited to this and is applied to a camera or the like. In short, the present invention can be widely applied to a photographing device configured to run a recording film and sequentially record an image for one frame on the recording film.

[0039]

As described above, according to the present invention, the recording film is driven and driven at a constant speed, and the optical axis angle of the photographing light supplied onto the recording film is corrected according to the traveling position of the film. By doing so, it is possible to realize a photographing device capable of recording a clear image without flow on the recording film without using the intermittent feeding mechanism.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a configuration of an image pickup apparatus according to an embodiment.

FIG. 2 is a schematic diagram for explaining an optical axis correction operation.

FIG. 3 is a schematic diagram showing an optical axis angle correction means according to another embodiment.

[Explanation of symbols]

1 ... Shooting device, 2 ... Movie film, 3A ... Supply reel, 3B ... Take-up reel, 5 ... Subject, 6 ... Shooting optical system, 10 ... Shatter, 11 ... Slider, 12 ...
... guide, 13 ... position detection coil, 15 ... light source,
16 ... Photodetector, 19 ... Shooting lens, 20 ... Apex variable prism, 30 ... Plano-convex lens, 31 ... Plano-concave lens, 40 ... Rotating mirror, 50 ... Liquid crystal prism, L
1, L2 ... Shooting light, AR ... Recording frame area.

Claims (7)

[Claims] 1. A photographing device configured to run a recording film and sequentially record an image of one frame on the recording film, a film running means for running the recording film at a constant speed, The photographing light forming means for sequentially forming the photographing light corresponding to the image for one frame, the film position detecting means for detecting the traveling position of the recording film, and the photographing light supplied on the recording film. An optical axis angle correcting means for correcting the optical axis angle according to the traveling position of the recording film detected by the film position detecting means. 2. The photographing light forming means comprises a light shielding means for shielding the photographing light during a period in which a recording target frame is converted from one frame to the next frame. Shooting device. 3. The optical axis angle correcting means has a lens, and the photographing light is moved by moving the lens in a direction perpendicular to the optical axis direction of the lens according to the traveling position of the recording film. The image pickup apparatus according to claim 1, wherein the optical axis angle of is corrected. 4. The optical axis angle correcting means has a variable apex angle prism, and the optical axis of the photographing light is changed by changing the apex angle of the variable apex angle prism according to the traveling position of the recording film. The photographing apparatus according to claim 1, wherein the angle is corrected. 5. The optical axis angle correcting means is a combination of a plano-convex lens and a plano-concave lens, and the convex surface of the plano-convex lens and the concave surface of the plano-concave lens are slid in accordance with the traveling position of the recording film. The image pickup apparatus according to claim 1, wherein the optical axis of the image pickup light is thereby corrected. 6. The optical axis angle correcting means has a rotating mirror, and the optical axis angle of the photographing light is corrected by rotating the rotating mirror in accordance with the traveling position of the recording film. The imaging device according to claim 1, wherein the imaging device is configured as described above. 7. The optical axis angle correction means has a variable refractive index liquid crystal prism, and the refractive index of the variable refractive index liquid crystal prism is changed according to the traveling position of the recording film, thereby changing the refractive index of the photographing light. The photographing apparatus according to claim 1, wherein the optical axis angle is corrected.