JPS6064584A - small optical recording device - 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 The present invention is a method for recording information such as images or images and audio by sequentially forming spiral or annular tracks on the surface medium of a cylindrical optical drum and irradiating a laser beam. This invention relates to a compact optical recording device that can reproduce data. Specifically, the present invention relates to a so-called electronic camera that uses a laser recording method to record fields, frames, and moving images with audio, and an integrated compact optical recording device that can replace an 8 mm camera.

Until now, VTRs using magnetic tapes and magnetic cameras using magnetic disks have been announced, and VTRs with built-in cameras as 8mm video cameras are about to be released soon. However, with 8mm video, if the diameter of the rotating cylinder is made smaller, the image quality deteriorates, and the original purpose is achieved in the mounting section, so miniaturization is not possible.
Frame memory had the disadvantage of requiring a long time to access. With a magnetic camera that uses a magnetic disk, the number of images taken is about 50 at most, so it is not foolish to record a video because the number of images is too small.
The number of shots taken using a magnetic camera could not satisfy the demand for taking as many pictures as possible. In addition, in order to increase the number of disks, the diameter of the disk must be increased and the number of tracks must be increased, so miniaturization is not possible (it had the disadvantage of number 8).

The present invention is intended to eliminate such drawbacks, and an object of the present invention is to be able to record moving images that can be put to practical use in spite of its small size, and to record a large enough number of images to be used as a frame memory or field memory. The purpose is to provide a portable recording device that can secure the following information.

The present invention will be described in detail. Video 1. This is a compact optical recording device with an integrated camera that can record and reproduce information including video and audio by sequentially forming spiral or thyroid-like tracks on the surface medium of a cylindrical optical drum and irradiating it with a laser beam. . The diameter of the optical drum is 30 to 50 FI+
+, the length is about 5o pieces, - 1 field per lap, trough pitch 1.6μ, therefore the total field distance is 31
It is capable of recording 250 fields. If the video signal is recorded using the NTSC method, the number of frames is 15.
This means that you can record 625 frames and a7'' minutes.

With the field recording method, it is possible to record for approximately 17 minutes, which is twice this amount, which is sufficient compared to the approximately 2.5 minutes for a single roll of film in a conventional 8mm camera. When used as field recording or frame recording of still images, the number of frames is more than 150,000 frames, which is sufficient for practical use. Furthermore, since it is easy to access, it is possible to instantly select a designated frame, and it is suitable for future text broadcasting using television and image services.

Next, the present invention will be explained in detail with reference to all the drawings.

FIG. 1 is a sectional view showing a cylindrical optical recording medium of the present invention, where 1 is a cylindrical optical recording medium forming surface, and the shaded area is made of a polymeric material. Reference numeral 2 denotes a rotating shaft, which is inserted into the polymeric material and whose 7 parts are integrated with a fixed part. A clutch disk 4 is formed on the inner end surface of the rotating shaft 2, and a motor (not shown) is disposed inside the cylinder 5 to be connected to the clutch disk 8. The diameter of the cylindrical optical recording body forming surface 1 is 30. 50 units will be selected from. The reason for this is that the innermost diameter of a conventional video disc for recording information is 100 mm.
One round = field, whereas the outer diameter of the cylinder of the present invention is - in order to make the recording device as small as possible.
Assuming that Shuichi fielded a record, it would be 1/; 5 o's. Therefore, the rotation speed of the optical drum of the present invention is 3600 rpm in the NTSC system. In order to further downsize the recording device, we would like to make the optical drum f: 50 ttml or lower, but for this it is necessary to improve the recording density.In the present invention, the wavelength of the semiconductor laser is currently 780 ~ Compared to 820 nm, a laser diode with a short wavelength is used to shorten the recording wavelength to 60 cm in order to increase the recording density.Therefore, the outer diameter of the optical drum is reduced to 50 cm.As for the recording time, If the cylinder length is 50cm and the track width is 1.6μ, which is the same as before, then 31250
) becomes a rack, NTS'! If the system is set to 6o fields per second, it is possible to record video and audio for a7 minutes.

Note that 16 frames per second is the standard for 8mm cameras, and it is possible to enjoy a movie at 30 fields per second, so if you adopt the so-called field skip method, the recording time will be 17.4 minutes, double the 87 minutes mentioned above. Recording becomes possible. A conventional 8mm camera costs about 2.5mm with one roll of film.
This is about 7 times the tf%tM that can be achieved for 5 minutes, and there is almost no problem in practical use. Since it is an optical recording, it is resistant to magnetic noise and electrical noise, and signal processing is easy, and the image quality and audio quality are considerably better than magnetic recording.

By storing a plurality of the optical drums of the present invention in a case that is easy to take out and carrying them with you, the recording device can be easily exchanged, thereby eliminating any inconvenience. If you edit it using a VTR or optical recording device that can record for a long time, it is possible to record video for as long as you like.

An embodiment of the compact optical recording device of the present invention is shown in FIG. Although Kone is shown as an 8mm camera model, it is easy to use a normal 35mm camera model, and this is simply a matter of layout.

10 is a camera lens, 11 is a half mirror 112
is a solid-state image sensor such as COD or MOS type
13 is a reflective stirrup and 14 is a finder. The rotating shaft 2 of the cylindrical optical recording medium 1 is a bearing.

Incorporate gears, etc. and hold them by X7 box 15.

It is attached so that it can be rotated. The motor 16 is fixed to the frame 18 by an L angle 17, and the motor rotating shaft 19 is equipped with a clutch disc 20 and is rotatable in conjunction with the opposing clutch disc 4. box 15
A screw 21 is rotatably attached to the
The optical head 22 is extended so that it can move left and right as shown by the arrow.

A laser beam is emitted from the optical head 22 so that recording and reproduction can be performed from a recording and reproduction device 23. Although not shown, the space on the right side of the acD12 houses circuits for operating this recording device, such as a video circuit, a control circuit, an audio circuit, a servo circuit, a motor drive circuit, and a power supply circuit. Although not shown, it can be stored inside the grip. The operation of this compact optical recording device will be explained.

First, a cylindrical optical recording medium is loaded into a recording device.

Light from the subject enters the camera lens 10, forms an image on the solid-state image sensor 12, and is processed as an electrical signal.
The signal is input to the optical head 22 and optically recorded on the surface of the cylindrical optical recording medium 1. At this time, the motor 16 is at 360 rpm.
The box 15 is rotated 17 so that the optical head 22 moves by one pitch, that is, 1.6 μm for each rotation.
The screw 21 rotates and operates via. For reproduction, the motor 16 rotates 1, the optical head 22 reads the image,
The signals are processed and output as video and audio signals. Although the microphone is not shown,
Like a normal VTR camera, it is fixed near the lens of the recording device. Although the recording and playback of continuous moving images has been described above, it is also possible to easily record and play back intermittent images one by one as frame recording. In this case, it is preferable to adopt a detailed annular recording method, but it is also possible to record and reproduce intermittent images using spiral recording. All you have to do is select one frame using the knob and optical head to record and play back. If a cylindrical optical recording medium is used, the length of the frame recording medium is always constant, and the length of the medium used does not change between the inner and outer circumferences like an optical disk, so the circuit processing is simple and stable. I get a signal. Furthermore, if the recording time is around 10 minutes, the disk diameter will be 10 crn or more, and an optical drum is advantageous in terms of miniaturization. What about VTR? A magnetic head cylinder unit is required, and even the newest compact 8mm video camera has a cylinder diameter of 40°, so miniaturization is still in progress. A conventional VTR has a complicated tape loading mechanism and a mechanism for stabilizing tape running, and has a structure that is not suitable for miniaturization. It's simple and effective.

As explained above, the compact optical recording device of the present invention is a new image recording device that will play a central role in future video culture, offering clear image quality and excellent drainage performance, replacing the conventional 8 mm camera and portable VTR. A wide range of applications is possible. The range of applications is extremely wide, including recording still images, temporary files for image printing, computer software recording, and other applications, and its effects are profound.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a cylindrical optical recording medium, which is an optical recording medium of the present invention, and FIG. . 1... Cylindrical optical recording medium 2... Rotating shaft 4... Clutch disk 10... Camera lens 12... Solid image sensor 15... Bearing, Gear box 16... Motor 19. ...Motor rotating shaft 21...
Screw 22... indicates an optical head. Applicant: Maiwa Seikosha Co., Ltd. Representative Patent Attorney: Tsutomu Mogami Figure 1 Figure 2

Claims (2)

[Claims] (1) An optical writing medium is formed on the outer peripheral side surface,
A compact optical recording device characterized in that a spiral or glue-like track is sequentially formed in the axial direction of an optical drum having a cylindrical outer shape to record and reproduce signals. (2) Camera lenses, solid-state image sensors, laser writing or playback heads, video circuits, control circuits. 2. The compact optical recording device according to claim 1, wherein the compact optical recording device includes an audio circuit, a servo circuit, a motor drive circuit, a power supply circuit, etc., is integrated with a camera and a recording device, and is portable.