JPH0142811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a molding device for recording and reproducing digital signals such as video discs, digital audio discs (for example, compact discs), still images, document files, and the like.

Conventional structure and its problems This type of digital signal recording/reproducing disk is
It is considered promising as an information medium due to its extremely high information density, low S/N ratio, and low noise.
It has been commercialized as a video disk, digital audio disk, etc.

FIG. 1 shows an overview of a general digital audio disk. In this method, a PCA-converted digital signal is used to create a concavo-convex pit array signal on a resin substrate, and this is reproduced by a semiconductor laser. In Figure 1, 1 is the entire disk, 2 is a resin substrate, 3 is a digital signal engraved on the resin substrate 2, 4 is a reflective film created on its surface, and 5 is a protection coated on the surface of the reflective film 4. The film 6 is a reproducing semiconductor laser irradiated from the reading surface of the disk 1.

Since the above-mentioned disk detects the reflectance change of the digital signal 3 through the resin substrate 2 using the semiconductor laser 6, if there is any contamination such as foreign matter, dirt, or dust on the resin substrate,
Errors in signal reproduction occur, leading to reproduction defects such as dropouts.

Injection molding is generally used to create resin substrates (1).
Ru. FIG. 2 shows a conventional molding device for a digital signal recording/reproducing disk. FIG. 2a is a front view, and FIG. 2b is a side view. The molding machine 7 and the resin substrate forming mold 8 placed thereon are generally installed in a clean room 9 to avoid the influence of the above-mentioned contamination. However, since the take-out device 10 is attached to the upper part of the mold and moves in the vertical direction, it causes contamination such as dirt and dust. Furthermore, even if the molding machine is installed in a clean room, the entire clean room 9 will become dirty due to contamination caused by oil mist, resin decomposition and burnt from the molding machine, and the upper part of the mold must be especially clean. For example, there is a problem in that a resin substrate containing contamination such as foreign matter, dirt, dust, etc. is molded.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
An object of the present invention is to provide a molding device for a digital signal recording/reproducing disk that can produce a resin substrate with excellent optical properties and less contamination such as foreign matter, impurities, dirt, and dust.

Structure of the Invention The present invention provides a clean air blowing device in the upper part of a substantially sealed space covering a molding die, a closing portion in a direction perpendicular to the clean air blowing device, and a take-out device that enters and exits the opening. The clean air blowing device blows clean air from the top to the bottom of the space, and the molded disk is taken out by the take-out device through the opening from a direction perpendicular to the clean air blowing device.

DESCRIPTION OF THE EMBODIMENTS FIGS. 3 to 5 show a first embodiment of the digital signal recording/reproducing disk molding apparatus of the present invention.
FIG. 3, FIG. 4, and FIG. 5 are a perspective view, a front view, and a side view of the entire device, respectively.

A molding die 8 is placed on the top of the molding machine 7, and the molding die is covered with a nearly sealed space 11. A clean air blowing device 12 is provided at the top of the space to blow clean air over the molding die. flows downwards. A space opening 13 is provided in a direction perpendicular to this, and the resin substrate 2 is molded by a take-out device 14.
is taken out.

As described above, according to this embodiment, the molding of the resin substrate is performed by blowing clean air from the upper part of the space covering the molding die, and taking out the molded product with the take-out device through the opening in the direction perpendicular to the clean air. It is possible to mold a high-quality disk with less contamination such as dirt and dust.

FIG. 6 shows a second embodiment of the digital signal recording/reproducing disk of the present invention. This is a side sectional view of the entire device.

A clean air blowing device 12 is provided above a substantially sealed space 11 that covers the molding die 8, and an opening/closing device 15 that is interlocked with a take-out device 14 is provided at an opening 13 of the space.

The opening/closing device 15 is closed during disk molding, and the clean air in the space flows from the top to the bottom of the mold, improving the cleanliness. After molding, when the resin substrate 2 is taken out by the take-out device 14, the opening/closing device 1
5 will be opened.

As described above, according to this embodiment, by providing the opening/closing device at the opening, the degree of cleanliness during molding can be improved, and a high-quality disk with less contamination such as dirt and dust can be molded. Can be done.

Effects of the Invention As described above, according to the present invention, a clean air blowing device is provided in the upper part of the almost sealed space covering the mold, an opening is provided in the direction perpendicular to the air blowing device, and the upper part of the space is Blows out cleaner air,
By taking out the molded product with the take-out device through the opening from the direction perpendicular to the opening, the cleanliness around the mold is improved, and the oil mist generated by the molding machine during molding and gases caused by resin decomposition and burnt are removed. The effect of this method is that it is possible to mold a digital signal recording/reproducing disk with excellent optical characteristics, which is less affected by contamination such as dirt and dust, and has less foreign matter and impurities.

[Brief explanation of drawings]

Figures 1a to 1c are a plan view, a cross-sectional view, and a cross-sectional view of main parts of a general digital signal recording/reproducing disk;
Figures 2a and 2b are a front view and a side view schematically showing a conventional molding device for a digital signal recording/reproducing disk;
3, 4, and 5 are perspective views, front views, and side views of the first embodiment of the invention, and FIGS. 6a and 6b are side sectional views of the second embodiment of the invention. be. DESCRIPTION OF SYMBOLS 1... Disk, 2... Resin substrate, 3... Digital signal, 4... Reflective film, 5... Protective film, 7...
... Molding machine, 8... Molding die, 11... Space covering the forming die, 12... Clean air blowing device, 13...
Opening portion, 14... taking out device, 15... opening/closing device.

Claims (1)

[Scope of Claims] 1. A clean air blowing device is provided in the upper part of a substantially sealed space covering the mold, an opening is provided in a direction perpendicular to the air blowing device, and a take-out device is provided that enters and exits the opening. Digital signal recording characterized in that clean air is blown from the clean air blowing device from the top to the bottom in the space, and the molded disk is taken out by the taking out device through the opening from a direction perpendicular to the clean air blowing device. Recycled disk molding equipment. 2. Digital signal recording and reproducing according to claim 1, characterized in that the opening is provided with an opening/closing device that is linked to the ejecting device, so that the opening is closed at all times and is opened only when the disc is ejected. Disc molding equipment.