JPS5850331B2 - Continuous transfer film recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides at least two methods for recording or reproducing image information by irradiating a one-dimensional scanning light beam, such as a laser beam, onto a film that is being transported continuously. A continuous transport film recording and reproducing device that uses a prismatic rotating polygonal mirror as an optical deflector to track a dimensional scanning raster and simplifies the configuration of the mechanical system and control system, especially for the number of fields in television and the number of film frames. The present invention relates to a continuous transport type film recording and reproducing apparatus capable of recording and reproducing television images regardless of the number of television images.

Conventionally, continuous transport film recording and reproducing devices have been used with rotating prism continuous projectors and rotating mirror continuous meshau projectors, but the former has a phenomenon in which dust attached to the rotating prism flows on the screen. In addition, severe frame blur occurs due to variations in the degree of shrinkage of the film, which has the drawback of requiring a complex correcting optical system with a variable optical path length as a countermeasure.

Furthermore, the latter requires an extremely high-precision cam mechanism to impart complex motion to the rotating mirror, making the projector itself very expensive and large in size.

The object of the present invention is to provide a continuous transport type film recorder which eliminates the above-mentioned drawbacks, allows highly accurate tracking of continuously transported film, does not cause frame blurring, and has a simplified configuration and is relatively inexpensive. The purpose is to provide a playback device.

That is, the present invention provides a continuous transport film recording and reproducing apparatus that records or reproduces image information by irradiating a two-dimensionally deflected light beam onto a continuously transporting film. The light beam is made to intersect at a point on the optical axis in the film transport direction, and the reflection point of the prismatic rotating polygon mirror is approximately aligned with the intersection, and the two-dimensionally deflected light beam is divided into two by the ridgeline of the mirror surface of the rotating polygon mirror. When two rasters are generated, set the angle of mirror division and the distance between the reflection point and the film so that the pitch interval of those rasters exactly matches the pitch interval of the image outline on the film, and then The rotation of the rotating polygon mirror is controlled so that the raster moves in accordance with the transport of the light beam. In a film recording and reproducing apparatus that records and reproduces image information on the film by forming an image on the surface of a film that is continuously transported by a formed two-dimensional scanning light beam, a structure is provided between the two-dimensional deflection means and the film. A relay lens system is provided so that the two-dimensional scanning light beam incident on the relay lens system intersects the optical axis at one point on the exit side, and a prismatic rotating polygon mirror is placed at that point so that the two-dimensional scanning light beam incident on the relay lens system intersects the optical axis at one point. The two-dimensional scanning light beam reflected by two adjacent reflecting surfaces via the ridge line of the polygon mirror scans two adjacent image frames on the surface of the film, respectively. and the rotating polygon mirror is rotated so that the reflected two-dimensional scanning light beam moves following the transport of the film.

Furthermore, in the film recording and reproducing apparatus of the present invention, the light beam guided to the two-dimensional deflection means is composed of two light beams spaced apart in the transport direction of the film and close to each other in parallel. The light beams can be alternately switched between a state in which two light beams are used simultaneously and a state in which only one light beam is used in conjunction with the rotation of the rotating polygon mirror.

Note that a birefringent prism can be used to form the two mutually parallel light beams.

Further, in order to switch between the two light beams, an optical modulator made of an electro-optic crystal can be used.

The present invention will be described in detail below with reference to the drawings.

First, the basic structure of the film recording and reproducing apparatus of the present invention will be explained with reference to FIG.

In FIG. 1, a light beam, for example a laser beam B, is first deflected at 27 points by a rotating polygon mirror RMh for horizontal deflection as shown in FIG. 1a, giving a horizontal deflection angle φh.

The light beam B, which has once spread into a fan shape due to this horizontal deflection, passes through the relay lens L1. 42 after passing through the optical system consisting of L2
Form an intersection at a point.

A vertical deflection galvanometer Gv is installed at this intersection P2, and as shown in FIG. 1, a vertical deflection angle φ9 in a direction perpendicular to the horizontal deflection plane is applied to the light beam B.

Next, the light beam B passes through an optical system consisting of relay lenses L3 t L4 and forms an intersection again at 23 points.

A prismatic rotating polygon mirror RM1 is installed at the intersection P3, and the light beam B is deflected in the same direction as the film transport direction shown by arrow A in FIG. The driving of the rotating polygon mirror RM is controlled so that the beam B follows.

Here, relay lens L1 y L2 y L3゜L4
Assuming that the focal lengths of are all equal f, then 21 points, 42 points, 23 points and relay lens L, ? L2. L3
．． Each relative distance between L4 becomes the value shown in the figure.

In other words, the distance between each point and each lens is f,
Lenses L, , L2 and L3. The distances between L4 are 2f and 2f+A, respectively, and in order to image the light emitted from lens L4 on the surface of film 1, lens L3
+ The distance between L4 is slightly shifted from 2f.

Note that the focal lengths of each lens do not necessarily have to be equal, and the focal lengths of the lenses do not necessarily have to be equal. P2. P3 respectively at the focal point of each lens, and lenses L1 . L2 and L3. If you set the distance of L4 to be the sum of the focal lengths of each lens,
A scale using a lens having an arbitrary appropriate focal length is as described in the specification of U.S. Pat.

Next, the film 1 has a radius H centered on the 23rd point.
The film 1 is supported by a film gate 2 and transported by a drive drum 3 equipped with a sprocket so that it travels at a constant speed on the circumference of the film 1. This will be explained with reference to FIG.

In FIG. 2, the light beam B incident on the rotating polygon mirror RM is in a state where it has not received either horizontal or vertical deflection, that is, the light beam B is at the position indicated by the dashed line in FIG. Indicates the condition.

When the incident beam B shown in FIG. If it is possible to control this, the raster when the incident beam B is deflected will always follow the image contour of the film 1 and move.

Therefore, with respect to FIG. 2, when the undeflected incident light beam B is incident on the rotating polygon mirror RM1, the reflected light beam B.

To consider the conditions for always aligning the center position of the film image area with the center position of the film image, regardless of the movement of the rotating polygon mirror RM1 and the film 1, coordinate axes x and y are set as shown in Fig. 2a, and the film The radius of curvature of the surface is R. The radius of the mirror RM1 that rotates once (distance between the center of the mirror surface and the axis of rotation O')
is R', the center of curvature of film 1 is the origin O, and the position of the rotation axis of the rotating polygon mirror RM is the coordinate 0'(x-R'/J
2, y--R'/J2), respectively.

Here, the value of the radius of curvature R of the film surface is the rotating polygon mirror R
The following relationship exists between the number of mirror surfaces N of M and the angle θf (radians) from which the image pitch (the length from the center of one image frame to the center of the next image frame) of film 1 is measured from the origin O. Set it so that it holds true.

Therefore, if the image pitch of the film 1 is p, then the radius of curvature R is as follows.

That is, the equations (1) and (2) reflect the reflected light beam B as shown in FIG.

When is divided into B1 and B2 by the mirror ridgeline,
This is a condition for the division angle θ3 to be an angle equivalent to one pitch of the film frame.

Next, a reflected light beam B is reflected as the film 1 travels.

Consider the conditions for the rotation to follow.

Now, with the direction of the incident light beam B aligned with the y-axis direction, consider the moment when the center of the mirror surface C is at the origin O, as shown in FIG. 2a.

At this time, the incident angle and exit angle of the incident light beam B with respect to the mirror surface C are both 7, and therefore the direction of the reflected light beam Bo coincides with the X axis.

In such a state, the reflected light beam B.

It is assumed that the phase of the image contour movement of the film 1 is determined so that the center of the film image contour C is irradiated.

When the rotating polygon mirror RM1 rotates in the direction of the arrow, a reflected light beam B is generated.

The rotation angle with respect to the X-axis is twice the rotation angle of the rotating polygon mirror RM1.

Therefore, the transport speed of the film 1 is determined by the rotating polygon mirror RM1.
If the image frame is set to move with an angular velocity twice the rotational angular velocity of , the reflected light beam B.

The irradiation point moves to coincide with the center of the image outline of the film 1.

The above are the conditions for tracking described above, which can be expressed as an equation.

Here, wm is the rotational angular velocity of the rotating polygon mirror RM, ■ is the transport speed (frames/second) of the film 1, and p is the above-mentioned image pitch.

Therefore, by substituting equation (2) into equation (3), we get is obtained.

Next, when the film 1 is driven by the drive drum 3 with a sprocket of radius H, the relationship between the rotation speeds of the drive drum 3 and the rotating polygon mirror RM1 is considered. nm, the condition of 2n=n (5) m s can be easily obtained from the ratio of their angular velocities.

Therefore, the rotating polygon mirror RM. and the driving drum 3 is 2:
It can be seen that the above-mentioned conditions can be easily satisfied by mechanically coupling using gears having the gear ratio (2).

A rotating polygon mirror RM1 that always satisfies each of the above conditions and
If we ignore the variation in the position of the reflection point of the light beam B on the mirror surface due to the rotation of the mirror (variation from the origin O in FIG. Regardless of the reflected light beam B.

follows the travel of film 1, always aligning with the center of the film contour.

The following states are sequentially shown in FIG. 2 at b + C.

Note that, as described above, when there is an incident light beam B in the y-axis direction shown in FIG. 2, a reflected light beam B.

If the relative movement between the rotating polygon mirror RM1 and the film 1 is controlled so that the irradiation point always coincides with the center position of the film frame, then as shown in Fig. 1, when the incident light beam B is deflected, It is clear that the raster in also moves to follow the film contour.

In the above explanation, an example has been described in which a single light beam is used; however, scanning the film image area of the device of the present invention using such a single beam is simple; In order to eliminate the distortion of the mirror surface, that is, the so-called surface sagging, the demands on the machining accuracy of the mirror surface become stricter.

That is, if the surface sag is not small enough to be ignored, the shape of the convergent light spot formed by the reflected light beams B1 and B2 divided at the ridge line becomes irregular, resulting in a decrease in image quality.

When converting a film image into a television signal by scanning the film two-dimensionally with a single light beam, the scanning raster moves from one image area to the next when the two image areas are simultaneously Since there is a scanning and overlapping period, there is an advantage that a television video signal that corresponds well to the fast movement of the subject image can be obtained.

However, on the other hand, when used for film recording of television video signals, the existence of the above-mentioned superimposition period becomes inconvenient.

Therefore, in the apparatus of the present invention, the following configuration is adopted so that high-quality images can be recorded even when recording television video signals on film.

That is, in the present invention, the light beam used for film scanning is a double beam, and the rotating polygon mirror RM is used.

The signals are generated by switching alternately in relation to the movement of the .

The double beam period during switching corresponds to the above-mentioned superimposed period.

When reproducing a film image, as mentioned above, it is generally desirable to have a suitable double beam period from the viewpoint of motion expression, while when recording a television image on film, such a double beam period is Preferably, this occurs within the vertical blanking period of the sync signal.

Therefore, in the film recording/reproducing apparatus of the present invention, two mutually parallel light beams are alternately switched and generated as the light beams used for film scanning.

Next, a description will be given of means for alternately switching and generating a plurality of parallel and close light beams used as described above.

FIG. 3 shows an example of means for alternately switching and generating a plurality of light beams as described above using polarized light.

In FIG. 3, 4 is a light beam switching signal amplifier;
is a crystal that exhibits an electro-optical effect, such as DKDP (potassium dihydrogen phosphate), ADP (ammonium dihydrogen phosphate)
This is an electro-optic light modulator using

There are two types of optical modulators of this kind, a vertical type and a horizontal type, but it is preferable to use the vertical type which is not temperature dependent in the device of the present invention.

Thus, a light beam B such as a laser beam enters the electro-optic light modulator 5.

As shown in the figure, assume that the direction of vibration is linearly polarized light parallel to the plane of the paper.

The crystal axis of the optical modulator 5 is set at an appropriate orientation with respect to the incident light beam in the vibration direction.

The amplifier 4 is adjusted so that the levels O and 1 of the optical beam switching signal correspond to the zero and half-wave voltage (voltage corresponding to 100% modulation) of the drive voltage applied to the optical modulator installed in this way. Set gain and polarity.

The emitted light beam B of the optical modulator 5 in such a configuration.

', linearly polarized light whose vibration directions are parallel and perpendicular to the plane of the paper, respectively, corresponding to level O and level 1 of the light beam switching signal are obtained.

Note that at an intermediate level between level 0 and level 1 of the switching signal, the emitted light beam B is emitted.

' is elliptically polarized light, so it becomes a light beam having both polarization components parallel and perpendicular to the plane of the paper.

When such an emitted light beam Bo' is made incident at an appropriate angle on a parallel plate 6 of a birefringent crystal such as calcite,
Since the parallel plate 6 exhibits different refractive indexes for the two linearly polarized lights that are perpendicular to each other, the light beam emitted from the parallel plate 6 has two polarized lights, B1 and B2, as shown in the figure, depending on the direction of vibration. Separate and proceed along the light path.

Since the output surfaces of the parallel plate 6 are parallel to each other, the output light beams B1 and B2 become parallel light beams.

In the optical system described above, the state of polarization changes due to modulation, but there is no loss of energy, so no matter how the beam emitted from the parallel plate 6 changes, its total energy remains unchanged. Therefore, it is extremely advantageous when the recording/reproducing apparatus of the present invention is configured as a lap dissolve type.

If the mutually parallel double beams B1 and B2 obtained as described above are used in place of the single light beam B in FIG. 1, lens L3. After passing through an optical system consisting of L4 and having an imaging function, two light beams B1 . B2 all converge to the same point.

That is, by considering the two solid lines forming the outline of beam B in FIG. 1 as separate light beams, the convergence at the same point can be easily understood.

Here, to explain in detail the convergence point of the two-dimensional scanning light beam falling on the film surface, Fig. 1 a + b
In the optical system having the configuration shown in , a beam convergence point is formed between relay lenses L3 and L4.

This beam convergence point is, for a two-dimensional scanning light beam,
Exists on a plane perpendicular to the optical axis.

Therefore, a raster structure of an imaged two-dimensional scan is drawn on that plane.

Thus, the raster structure drawn on a plane perpendicular to the optical axis is re-imaged onto the surface of film 1 by lens L4, and at this time, the surface of film 1 is Therefore, in the width direction of the film 1, the scanning light beam converges on a plane perpendicular to the optical axis as shown in FIG. In the direction of transport, as shown in Figure 1,
The convergence points at the center and upper and lower ends of the film screen are shifted in the optical axis direction.

In other words, if the convergence point of the scanning light beam is formed completely on the surface of the film 1 at the center of the film screen, the convergence point of the scanning light beam will be formed completely on the surface of the film 1 at both the upper and lower ends of the film screen. It is formed further back, resulting in a so-called "rear pin" condition.

However, in reality, when a laser beam is used as the scanning light beam, the depth of focus of the laser scanning light beam is quite deep, so the film is The radius of curvature of the gate 2 and the number of mirror surfaces of the prismatic rotating polygon mirror RM1 for film tracking can be set appropriately, and the use for the arc-shaped curved film screen i is practical with regard to the convergence of the scanning light beam on the film surface. It is also possible to prevent the above-mentioned problems from occurring.

Next, with reference to FIGS. 4 and 5, the operation of the recording/reproducing apparatus of the present invention when using a plurality of light beams will be described in detail.

The coordinate axes in FIG. 4 include time t on the horizontal axis, and other coordinate axes x/ with the origin at the rotation axis O' of the rotating polygon mirror RM, as shown in FIG. 5a, on the vertical axis. Take the angle θ measured clockwise from the y' axis at y/.

Using this angle θ, the ridge line e1. formed by the mirror surface of the rotating polygon mirror RM1 is determined. e2. The position of e3... and the incident position of the light beams B1 and B2 on the mirror surface are represented by θ8, θ8, θ8, and θ, respectively, as shown in FIG. represents the incident position and distance between them, as well as the dividing angle of the mirror surface.

Further, the lower part of FIG. 4 also shows temporal changes in the light beam switching signal.

Now, as shown in FIGS. 4 and 5, the light beam B1
and B2 have the same thickness, and their diameters are expressed by the angle θ, which is smaller than θM/2, and θS
−θM/2.

As shown in Figure 4, if we pay attention to the period (shaded area) in which the light beam is not eclipsed by the ridge lines between the mirror surfaces, we find that
to-t1'lt2-t3. From t4 to t, . . . , there is a period in which both the light beams B1 t and B2 are not eclipsed.

Therefore, by setting the waveform of the light beam switching signal as shown in FIG. 4 so that these periods become the above-mentioned superimposed period, the film 1 can always be scanned with a light beam without vignetting.

FIG. 5 shows the t-ta shown in FIG. The states of reflection of the light beam at times tb and to are shown, respectively.

Here, as described above, the total energy of the plurality of light beams B, , B2 at the time points 1=1a and 1=16 is equal to the energy of the single light beam B1 at the time point t=tb.

Note that the rising and falling times in the waveform of the optical beam switching signal can be shortened to tl-tQv (3-t2 as the maximum value and the minimum value as zero, respectively, and the phase of the waveform at that time is , each falling edge is t.

-tl, it may be between t2 and t3.

Furthermore, when such a plurality of light beams are used for film recording, the rising and falling periods and the phases are adjusted so that the above-mentioned rising and falling periods are included in the vertical or horizontal retrace period of the television video signal. You will have to set it.

Next, in the film recording and reproducing apparatus of the present invention, a single light beam is used for film scanning, and the optical path of the single light beam is vibrably changed, so-called wobbling, whereby adjacent film image areas are An example will be described in which the vignetting period of the light beam due to the ridge lines between the mirror surfaces is kept within the vertical or horizontal retrace period of the television video signal without performing lap dissolve.

The wobbling of such a light beam is described in Japanese Patent Publication No. 16824/1983 filed by the applicant, and in "Optical Scanning Method 1l-NHK Technical Research" magazine, Vol. 27, Vol. 27, published by the inventors of the present application. No. 1, pages 20-32 (19
This is done in the same way as "enlargement of effective aperture and optical correction of unnecessary deflection components in a light beam scanner using a rotating polygon mirror" described in 75), and a sine wave and a #LMrv wave are used as the drive waveform for wobbling. There are two methods using this method, and here we will discuss the latter method using sawtooth waves.

First, the manner in which a wobbling light beam is generated by sawtooth wobbling will be explained with reference to FIG.

As shown in FIG.
A beam waist (the constriction of the light beam) is formed at a position on the optical axis that is separated by 1.

A wobbling optical deflector 8 is placed at this beam waist position.
is provided and a deflection of the fiL waveform is applied to the emitted beam.

This deflected beam is guided to a lens 9 having a focal length f2 to convert it into a light beam parallel to the optical axis of the incident light beam.

Note that the position of the lens 9 is set at a point separated from the optical deflector 8 by a focal length f2.

Further, it is preferable to use a small galvanometer with excellent frequency characteristics as the wobbling optical deflector 8.

If the sawtooth wobbling light beam BW obtained as described above is used as the incident light beam B in FIG. Although the position of the incident point of the light beam changes according to the wobbling waveform, the relative position of the light beam spot does not change on the film surface due to wobbling.

Figure 7 shows the mirror surface of the rotating polygon mirror RM1 and the incident light beam Bw.
This shows the relative positional relationship with.

When converting a general movie film into a standard television video signal using the film recording and reproducing apparatus of the present invention, the so-called so-called Since it is necessary to perform 2-3 pulldown, in that case, the waveform of the sawtooth wobbling is appropriately modified to correspond to the period of 23 pulldown.

The above-mentioned wobbling method is inferior to the above-mentioned double beam method in that it does not produce a lap dissolve type, but as can be seen by comparing Fig. 4 and Fig. 7, the rotating polygon mirror RM It has the advantage that the thickness of the light beam that can be handled is approximately twice that of a mirror surface of the same size.

However, if the thickness of the light beam that can be handled by the optical deflection system is doubled, the spot size at the subsequent convergence point will be halved according to the theory of diffraction, so the overall result is The resolution of the image obtained by the scanning light beam is doubled.

Therefore, when applying the present invention to a film recording device, it is clearly more suitable to use the wobbling method.

Next, the film recording and reproducing apparatus of the present invention can more easily correct film shrinkage than conventional rotating prism type continuous transport projectors.

That is, as can be easily seen from FIG. 1, shrinkage of the film 1 can be easily handled by simply shortening the radius of curvature R of the film gate 2 in accordance with the amount of shrinkage of the film, without changing the center of curvature of the film gate 2. The corrections described above can be made.

In reality, the shrinkage rate of the film is less than 1%, so the radius of curvature R of the film gate remains unchanged, and only the position of the film gate 2 is set as the center of curvature P.

The purpose of correction can be achieved by providing a simple adjustment mechanism that slightly moves the film in the direction of , and the film shrinkage can be corrected using a much simpler mechanism than the film shrinkage correction optical system in conventional rotating prism continuous projectors. Can be done.

In the above-described examples of the film recording and reproducing apparatus of the present invention, the structure uses an arc-shaped curved film gate, but as described above, when such a curved film gate is used, the film surface becomes a curved surface. Therefore, due to the convergence effect of the optical system, it cannot be accurately adapted to scanning raster light that forms an image on a plane, and there is a problem that a state of focus on the entire surface cannot be obtained.

However, as mentioned above, when a laser beam is used as the scanning light beam, the depth of focus of the laser beam is quite deep, so this does not pose much of a problem when recording and reproducing standard television images, but especially when using high-definition images. This becomes a problem that cannot be ignored when recording and playing back television images.

On the other hand, if a configuration using a straight film gate is adopted, this problem can be easily solved.

That is, as shown in FIG. 8, the deflected light beams Ba and Bb incident on the rotating polygon mirror RM1 correspond to the two light beams incident on the rotating polygon mirror shown in FIG. The incident light beam of the rotating polygon mirror RM1 changes from Ba to Bb.
Assume that the deflection is such that it gradually moves to , and then rapidly returns from Bb to Ba.

Furthermore, the lens L3. shown in FIG. 1 is used so that these incident light beams themselves become parallel beams. It is assumed that an optical system based on L4 is set.

Therefore, in the configuration shown in FIG. 8, the rotating polygon mirror RM
The path of the reflected light beam from 1 is bent by the plane converging lens L5, and the beam is converged at the same time, and is focused on the surface of the film 1 that is in close contact with the film gate 10. On the other hand, in an ideal converging lens, Since all parallel light beams have the property of converging on the focal plane of the converging lens, regardless of the direction of the optical path, the scanning light beam obtained by the configuration shown in FIG.
You can focus entirely on the top.

Further, in the above description, it has been described that a sprocket is used to transport the film, but since this is a continuous transport type device, it is also possible to use a capstan drive.

In that case, it is preferable to photoelectrically detect the perforations of the film 1 and perform electrically controlled servo driving.

As is clear from the above description, according to the present invention, the following remarkable effects can be obtained.

That is, in the continuous transport type film recording and reproducing apparatus of the present invention, in addition to the first optical deflector in the film transport direction for the light beam for two-dimensionally scanning the film outline, there is also a second optical deflector.
The second optical deflector is arranged at the deflection point in the second film transport direction formed by the optical system, and the deflection speed of the second optical deflector is set as the continuous transport speed of the film. By associating the two-dimensional scanning light with the movement of the film outline, the two-dimensional scanning light can be moved to follow the movement of the film outline, regardless of the film transport speed.

Therefore, in the apparatus of the present invention, even if the film is continuously run at an arbitrary speed, it is possible to easily follow the film run and record and reproduce television video signals.

Furthermore, when the scanning light beam is simultaneously reflected from two adjacent reflecting mirrors beyond the ridge line formed by the reflecting mirror in the rotating polygon mirror serving as the second film transport direction optical deflector, The reflected light beams accurately scan each adjacent film image area, and the splitting ratio of the scanning light beam, which is divided into two by the ridgeline, gradually changes as the polygon mirror rotates, so that adjacent film image areas can be scanned accurately. can be reproduced in a lap dissolve manner, and an extremely high quality reproduced image can be obtained by wobbling when the scanning light beam crosses the ridgeline of the rotating polygon mirror.

In the above explanation, an example has been described in which an optical deflector in the film width direction, an optical deflector in the film transport direction, and a film tracking optical deflector are arranged in this order in the optical path of the film scanning light beam. The order of arrangement of each optical deflector is not limited to this example, and the order can be changed and arranged appropriately depending on the necessity, such as what kind of optical deflection element is used as each optical deflector. can.

[Brief explanation of the drawing]

FIGS. 1a and 1b are top and side views showing the basic structure of the optical system for generating a scanning light beam, respectively, and FIGS. 3 is a diagram showing an example of the arrangement of means for alternately switching and generating multiple scanning light beams, and FIG. 4 is a diagram showing the mirror surface of a rotating polygon mirror for film tracking in a multiple light beam method. FIG. 5a is a diagram showing temporal changes in the relative positional relationship between the ridgeline and the incident light beam. b and c are diagrams sequentially showing the relationship between the temporal changes in the relative positional relationship shown in Fig. 4 and the states of the incident beam and exit beam of the rotating polygon mirror for film tracking; FIG. 7 is a layout diagram showing an example of the generating means; FIG. 7 is a diagram showing temporal changes in the relative positional relationship between the mirror surface edge of the rotating polygon mirror for film tracking and the light beam incident point for the sawtooth wave wobbling light beam; FIG. FIG. 8 is a line section showing the configuration and operation of the device of the present invention when a linear field gate is used. B...Scanning light beam, Ll + L2 + L
3 + L4...Relay lens, L5...
... Lens for plane convergence, Gv..., ... Galvanometer RM ... Rotating polygon mirror for film tracking, RMh ... Rotating polygon mirror for horizontal deflection, 1... ... Film, 2 ... Film gate, 3 ... Rotating drum, 4 ... Light beam switching signal amplifier, 5 ... Crystal for electro-optic effect. , 6... Parallel plate for birefringence, 7...
Converging lens, 8... Optical deflector for wobbling,
9... Converging lens, 10... Linear film gate.

Claims (1)

[Scope of Claims] 1. In a film recording and reproducing apparatus that records and reproduces image information by irradiating a continuously transported film with a two-dimensional scanning light beam formed by guiding a light beam to a two-dimensional deflection means, A relay lens system is provided between the dimensional deflection means and the film, so that the two-dimensional scanning light beam incident on the relay lens system intersects the optical axis at one point on the exit side, and at the same point. , the two-dimensional scanning light beams reflected by two adjacent reflective surfaces of the prismatic rotating polygon mirror through the ridge lines of the rotating polygon mirror form two adjacent images on the surface of the film. The rotating polygon mirror is configured and arranged so as to scan each frame, and the rotating polygon mirror is rotated so that the reflected two-dimensional scanning light beam moves following the transport of the film. A continuous transport type film recording and reproducing device. 2. The two-dimensional scanning light beam divided by the two adjacent reflecting surfaces of the prismatic rotating polygon mirror simultaneously scans two adjacent image frames on the surface of the film to superimpose and illuminate them. 2. The continuous transport type film recording and reproducing apparatus according to claim 1, wherein image information is recorded and reproduced in a wrap-dissolve manner. 3. The light beam sequentially scans the two adjacent reflecting surfaces of the prismatic rotating polygon mirror in a predetermined period, and when passing through the ridge line formed by the two reflecting surfaces, the light beam scans the ridge line at high speed. 2. A continuous transport type film recording and reproducing apparatus according to claim 1, characterized in that the continuous transport type film recording and reproducing apparatus is configured to jump over the film. 4. The light beam is composed of two parallel light beams spaced apart from each other in the transport direction of the film, and the two light beams are alternately arranged at a predetermined period related to the rotation of the rotating polygon mirror. 2. A continuous transport type film recording and reproducing apparatus according to claim 1, characterized in that the continuous transport type film recording and reproducing apparatus is configured to switch to generate the signal.