JPS5816536B2 - Video record irradiation equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a video record irradiation device.

To create a so-called video record in which video information such as a television signal is recorded on a record and the video signal is easily reproduced in the same way as audio information, it is conventional to record the video signal from a video signal source such as a video tape recorder. The electric signal is reproduced and recorded on a photographic film, and this film is reproduced using a flying spot scanner or the like at a speed commensurate with the processing speed of the record master cutter. The original version was created.

However, in general, the upper limit of the reproduction frequency of a video signal is a wide range up to several megahertz, and on the other hand, the frequency limit of mechanical vibration of a device that mechanically processes a record master is only a few tens of kilohertz. In order to create a video signal, the playback speed of the video signal must be reduced to the upper limit of the mechanical processing speed, and as a result, the processing time is approximately 100 times longer than the video signal playback time. Ta.

The long time it takes to create such an original is an extremely serious drawback when it comes to providing video records, etc., quickly and in large quantities at low cost.

An object of the present invention is to provide a video record irradiation device that can maintain a constant distance between a record plate and an objective lens and irradiate constant light energy when irradiating light onto a record plate.

In order to achieve the above object, the present invention is characterized in that a substrate with good flatness is rotated at a high speed comparable to that of a television frame per second, and an air flow is generated on the surface of the substrate. A video signal is recorded on the substrate by irradiating a laser beam modulated by a video signal through a floating optical system.

Other features of the present invention will become apparent from the detailed embodiments of the present invention described below.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 shows an overall configuration diagram of an embodiment according to the present invention. In the figure, T is a turntable rotated by a motor Ml, and SB is integrally fixed onto the table T by a fixture not shown. Original video record, TV
SG is a video signal source such as a VTR, and MC is a signal source T.
Receives vertical period signal ■ and horizontal synchronization signal H from VSG,
A drive circuit generates a current to drive the motor M1 at the same speed as the television frame, and M2 is a motor that rotates the screw member S for each frame by the drive circuit MC.

The motor M2 is fixed on a frame (not shown), and is driven together with the motor M1 by the output of the drive circuit MC.

C is a carrier member that fits into the screw member S and is displaced in the direction a by the rotation of the member S, and its one end is connected to C1 and C.
It is branched into i2, and the C1 section is provided with a mirror prism M, and the C2 section is provided with an opening O, and a floating element F that holds the lens L is supported on the periphery of the opening via a spring member SP.

LRI is a laser beam for recording video signals, and the laser beam B1 generated from this light source is modulated by a video signal VS from a video signal source TVSG and sent to a modulator MD and a half mirror.

The light is projected onto a mirror prism M (reflection member) via a mirror prism HM.

LR2 is a second laser light source for recording a guide for a signal reproducing vibrator on the original video record SB.

The laser light from laser light sources LRI and LR2 is blurry.

The beams are synthesized by the half-mirror surface of the beam HM and reach the element plate SB by the mirror M and the imaging lens L.

FIG. 2 shows an enlarged view of the branching portion C2 of the carrier member C, and the float F is formed by a spring member SP, which is schematically shown as a leaf spring for convenience of explanation. It is carried.

Further, the bottom surface of the float F is formed in an arc shape with respect to the rotational direction A of the blank plate SB, like a known float used in a floating magnetic head, and the blank plate SB is rotated by the motor M1. When the video signal Since the wavelength is a small value of about several microns, the laser beam BM needs to be imaged in the form of a very thin slit on the surface of the blank plate 88, so the variation in this interval g must be made as small as possible.

For example, in order to obtain an optical image with a width of about 0.5μ, a lens L with a short focal length and a small aperture ratio is required.
In such a case, the depth of focus of the lens is very shallow, so the distance g between the lens and the surface of the blank plate 88 actually has an allowable value of 0.
It is about 3μ.

It is possible to suppress the fluctuation within such a range by using the floating element F mentioned above.

As shown in the second diagram, the base plate SB consists of a relatively low-sensitivity photoresist PH on a substrate BP made of glass or the like with good surface properties.
A laminated coating of two layers and one layer of relatively high sensitivity photoresist PH is applied.

The photoresist layer PRI is always exposed to the laser light from the laser light source LR'2, but the photoresist layer PR2 is not affected, and the photoresist layers PR1 and PH1 are exposed to the laser light from the laser light source LRI through the modulator MD. When the intensity is high, both sides are exposed, and when the intensity is low, the photoresist layer P
It has a photosensitive property of exposing only R'1.

In the above configuration, the driving circuit MC is controlled by the synchronizing signals V, H and the video signal vS from the video signal source TVSG.
When the modulator MD is activated, the motors Ml and M2 start rotating, and the airflow on the surface of the blank plate SB on the turntable T causes the float F to hold the lens L while maintaining a constant distance from the surface of the blank plate 88. I will do it.

On the other hand, half mirror prism HM, mirror prism M
The laser light (Bl +82) from the laser light sources LRI and LR2 is directed to the blank plate 88 by the imaging lens L.
The laser light synthesized on the surface is focused along the radial direction R with a width G and irradiated onto the photoresist layers PRI and PH2 (see FIG. 3).

On the other hand, the modulator M receives laser light B from the laser light source LRI.
1, and the photoresist layer PRI is exposed to the modulated laser beam BM.

When the laser light intensity is high, the photoresist layer PH
2, as shown in FIG.
H1 is selectively exposed to light to record one wavelength P of the video signal component.

The floater F is continuously or intermittently fed in the radial direction via the carrier by the rotation of the motor M2, but depending on the intensity of the laser beam 82 from the laser light source LR2, the photosensitive layer PR2 is not exposed to the photoresist. When the layer is chemically treated, guide dams B corresponding to the pitch width of the threaded member S are continuously formed along the video recording section G (see FIG. 3d).

This guide portion B is a concave guide formed on the duplicate record board when a video record original plate is formed by chemically processing the base plate SB and then reproduced in large quantities using normal record making technology, and this serves as a signal. It can be applied as a guide for a reproducing vibrator chamber.

Note that in the above embodiment, the photoresist layer PRI
, PH1 is selectively sensitive to the intensity of the laser light itself or the modulated laser light from the laser light sources LR1, LR2. However, instead of the intensity, the laser emission wavelength of the laser light sources LR1, LR2 is However, it goes without saying that the same effect can be obtained even if the sensor is selectively sensitive to this wavelength.

As described above, according to the present invention, not only can the distance between the lens and the record board be kept constant and constant light energy can be irradiated onto the record board, but also the configuration of the apparatus can be made smaller and simpler.

Therefore, its industrial effects are truly great.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a float applied to the first illustrated device, and FIG.
This is an enlarged explanatory view of the record original plate formed by the illustrated device, and Fig. 3a is a diagram of the entire configuration of the record original plate finally formed, and Fig. 3 is an explanatory diagram of the exposure state of the record blank in the semi-distorted direction. ,; FIG. 3C is an explanatory diagram of the state of exposure in the cutting line direction of the record blank, and FIG. 3D is an enlarged partial view of the finally produced record master. PRl and PH1 are photoresist layers with different sensitivities coated on a substrate B with good flatness, and SB is a substrate BP.
, a raw plate for creating a video record original plate consisting of laminated resist layers PRI and PH1, LRl is a laser beam B of a constant intensity.
LR2 is a laser light source that generates laser light B1 modulated by the video signal S; HM is a half mirror prism for adding the laser light from laser light sources LR1 and LR2; It is.

Claims (1)

[Claims] 1. A drive device for rotating a record plate at high speed, a lens provided close to the rotating record plate and irradiated with parallel light, and a lens that directs the parallel light incident parallel to the plane of the record plate. a reflecting member that deflects the light in the direction of irradiating the record plate through the lens, a float that holds the lens and floats due to the airflow caused by the rotation of the record plate, and a float that connects the reflecting member and the float to the record plate. a carrier member that is moved in the radial direction of the record plate and parallel to the plane of the record plate, the reflecting member is fixedly attached to the carrier member, and the float is attached to the carrier member via a spring member. 1. A video record irradiation device, characterized in that the direction of incidence of parallel light incident on the reflection member and the direction of movement of the carrier member are made to coincide with each other.